[lwP] Add light weight process component.

22 files changed, 3675 insertions, 16 deletions

diff --git a/components/Kconfig b/components/Kconfig
index ed5c137d37..3bcae8e163 100644
--- a/components/Kconfig
+++ b/components/Kconfig
@@ -26,6 +26,8 @@ source "$RTT_DIR/components/drivers/Kconfig"
 
 source "$RTT_DIR/components/libc/Kconfig"
 
+source "$RTT_DIR/components/lwp/Kconfig"
+
 source "$RTT_DIR/components/net/Kconfig"
 
 source "$RTT_DIR/components/vbus/Kconfig"
diff --git a/components/dfs/include/dfs.h b/components/dfs/include/dfs.h
index 91ef42ab56..f17458bd69 100644
--- a/components/dfs/include/dfs.h
+++ b/components/dfs/include/dfs.h
@@ -95,6 +95,12 @@ struct dirent
     char d_name[DFS_PATH_MAX];   /* The null-terminated file name */
 };
 
+struct dfs_fdtable
+{
+    uint32_t maxfd;
+    struct dfs_fd **fds;
+};
+
 /* Initialization of dfs */
 int dfs_init(void);
 
@@ -110,6 +116,8 @@ struct dfs_fd *fd_get(int fd);
 void fd_put(struct dfs_fd *fd);
 int fd_is_open(const char *pathname);
 
+struct dfs_fdtable* dfs_fdtable_get(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 858399fd13..f613168a4c 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -21,12 +21,16 @@
  * Date           Author       Notes
  * 2005-02-22     Bernard      The first version.
  * 2017-12-11     Bernard      Use rt_free to instead of free in fd_is_open().
+ * 2018-03-20     Heyuanjie    dynamic allocation FD
  */
 
 #include <dfs.h>
 #include <dfs_fs.h>
 #include <dfs_file.h>
 #include "dfs_private.h"
+#ifdef RT_USING_LWP
+#include <lwp.h>
+#endif
 
 /* Global variables */
 const struct dfs_filesystem_ops *filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX];
@@ -39,7 +43,8 @@ static struct rt_mutex fslock;
 char working_directory[DFS_PATH_MAX] = {"/"};
 #endif
 
-struct dfs_fd fd_table[DFS_FD_MAX];
+static struct dfs_fdtable _fdtab;
+static int  fd_alloc(struct dfs_fdtable *fdt, int startfd);
 
 /**
  * @addtogroup DFS
@@ -57,7 +62,7 @@ int dfs_init(void)
     /* clear filesystem table */
     memset(filesystem_table, 0, sizeof(filesystem_table));
     /* clean fd table */
-    memset(fd_table, 0, sizeof(fd_table));
+    memset(&_fdtab, 0, sizeof(_fdtab));
 
     /* create device filesystem lock */
     rt_mutex_init(&fslock, "fslock", RT_IPC_FLAG_FIFO);
@@ -90,9 +95,13 @@ INIT_PREV_EXPORT(dfs_init);
  */
 void dfs_lock(void)
 {
-    rt_err_t result;
+    rt_err_t result = -RT_EBUSY;
+
+    while (result == -RT_EBUSY)
+    {
+        result = rt_mutex_take(&fslock, RT_WAITING_FOREVER);
+    }
 
-    result = rt_mutex_take(&fslock, RT_WAITING_FOREVER);
     if (result != RT_EOK)
     {
         RT_ASSERT(0);
@@ -109,6 +118,54 @@ void dfs_unlock(void)
     rt_mutex_release(&fslock);
 }
 
+static int fd_alloc(struct dfs_fdtable *fdt, int startfd)
+{
+    int idx;
+
+    /* find an empty fd entry */
+    for (idx = startfd; idx < fdt->maxfd; idx++)
+    {
+        if (fdt->fds[idx] == RT_NULL)
+            break;
+        if (fdt->fds[idx]->ref_count == 0)
+            break;
+    }
+
+    /* allocate a larger FD container */
+    if (idx == fdt->maxfd && fdt->maxfd < DFS_FD_MAX)
+    {
+        int cnt, index;
+        struct dfs_fd **fds;
+
+        /* increase the number of FD with 4 step length */
+        cnt = fdt->maxfd + 4;
+        cnt = cnt > DFS_FD_MAX? DFS_FD_MAX : cnt;
+
+        fds = rt_realloc(fdt->fds, cnt * sizeof(struct dfs_fd *));
+        if (fds == NULL) goto __out; /* return fdt->maxfd */
+
+        /* clean the new allocated fds */
+        for (index = fdt->maxfd; index < cnt; index ++)
+        {
+            fds[index] = NULL;
+        }
+
+        fdt->fds   = fds;
+        fdt->maxfd = cnt;
+    }
+
+    /* allocate  'struct dfs_fd' */
+    if (idx < fdt->maxfd &&fdt->fds[idx] == RT_NULL)
+    {
+        fdt->fds[idx] = rt_malloc(sizeof(struct dfs_fd));
+        if (fdt->fds[idx] == RT_NULL)
+            idx = fdt->maxfd;
+    }
+
+__out:
+    return idx;
+}
+
 /**
  * @ingroup Fd
  * This function will allocate a file descriptor.
@@ -119,21 +176,23 @@ int fd_new(void)
 {
     struct dfs_fd *d;
     int idx;
+    struct dfs_fdtable *fdt;
 
+    fdt = dfs_fdtable_get();
     /* lock filesystem */
     dfs_lock();
 
     /* find an empty fd entry */
-    for (idx = 0; idx < DFS_FD_MAX && fd_table[idx].ref_count > 0; idx++);
+    idx = fd_alloc(fdt, 0);
 
     /* can't find an empty fd entry */
-    if (idx == DFS_FD_MAX)
+    if (idx == fdt->maxfd)
     {
         idx = -(1 + DFS_FD_OFFSET);
         goto __result;
     }
 
-    d = &(fd_table[idx]);
+    d = fdt->fds[idx];
     d->ref_count = 1;
     d->magic = DFS_FD_MAGIC;
 
@@ -154,13 +213,15 @@ __result:
 struct dfs_fd *fd_get(int fd)
 {
     struct dfs_fd *d;
+    struct dfs_fdtable *fdt;
 
+    fdt = dfs_fdtable_get();
     fd = fd - DFS_FD_OFFSET;
-    if (fd < 0 || fd >= DFS_FD_MAX)
+    if (fd < 0 || fd >= fdt->maxfd)
         return NULL;
 
     dfs_lock();
-    d = &fd_table[fd];
+    d = fdt->fds[fd];
 
     /* check dfs_fd valid or not */
     if (d->magic != DFS_FD_MAGIC)
@@ -186,12 +247,25 @@ void fd_put(struct dfs_fd *fd)
     RT_ASSERT(fd != NULL);
 
     dfs_lock();
+
     fd->ref_count --;
 
     /* clear this fd entry */
     if (fd->ref_count == 0)
     {
-        memset(fd, 0, sizeof(struct dfs_fd));
+        int index;
+        struct dfs_fdtable *fdt;
+
+        fdt = dfs_fdtable_get();
+        for (index = 0; index < fdt->maxfd; index ++)
+        {
+            if (fdt->fds[index] == fd)
+            {
+                rt_free(fd);
+                fdt->fds[index] = 0;
+                break;
+            }
+        }
     }
     dfs_unlock();
 }
@@ -211,7 +285,9 @@ int fd_is_open(const char *pathname)
     unsigned int index;
     struct dfs_filesystem *fs;
     struct dfs_fd *fd;
+    struct dfs_fdtable *fdt;
 
+    fdt = dfs_fdtable_get();
     fullpath = dfs_normalize_path(NULL, pathname);
     if (fullpath != NULL)
     {
@@ -233,11 +309,10 @@ int fd_is_open(const char *pathname)
 
         dfs_lock();
 
-        for (index = 0; index < DFS_FD_MAX; index++)
+        for (index = 0; index < fdt->maxfd; index++)
         {
-            fd = &(fd_table[index]);
-            if (fd->fops == NULL)
-                continue;
+            fd = fdt->fds[index];
+            if (fd == NULL) continue;
 
             if (fd->fops == fs->ops->fops && strcmp(fd->path, mountpath) == 0)
             {
@@ -414,17 +489,43 @@ up_one:
     return fullpath;
 }
 RTM_EXPORT(dfs_normalize_path);
+
+/**
+ * This function will get the file descriptor table of current process.
+ */
+struct dfs_fdtable* dfs_fdtable_get(void)
+{
+    struct dfs_fdtable *fdt;
+#ifdef RT_USING_LWP
+	struct rt_lwp *lwp;
+
+	lwp = (struct rt_lwp *)rt_thread_self()->user_data;
+    if (lwp)
+		fdt = &lwp->fdt;
+	else
+		fdt = &_fdtab;
+#else
+    fdt = &_fdtab;
+#endif
+
+    return fdt;
+}
+
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 int list_fd(void)
 {
     int index;
+    struct dfs_fdtable *fd_table;
+    
+    fd_table = dfs_fdtable_get();
+    if (!fd_table) return -1;
 
     rt_enter_critical();
 
-    for (index = 0; index < DFS_FD_MAX; index ++)
+    for (index = 0; index < fd_table->maxfd; index ++)
     {
-        struct dfs_fd *fd = &(fd_table[index]);
+        struct dfs_fd *fd = fd_table->fds[index];
 
         if (fd->fops)
         {
diff --git a/components/lwp/Kconfig b/components/lwp/Kconfig
new file mode 100644
index 0000000000..e3f13a3b6d
--- /dev/null
+++ b/components/lwp/Kconfig
@@ -0,0 +1,7 @@
+config RT_USING_LWP
+    bool "Using light-weight process"
+    select RT_USING_DFS
+    depends on ARCH_ARM_CORTEX_M
+    default n
+    help
+        The lwP is a light weight process running in user mode.
diff --git a/components/lwp/SConscript b/components/lwp/SConscript
new file mode 100644
index 0000000000..f54d9422e1
--- /dev/null
+++ b/components/lwp/SConscript
@@ -0,0 +1,20 @@
+Import('rtconfig')
+from building import *
+
+cwd     = GetCurrentDir()
+src     = []
+CPPPATH = []
+
+support_arch  = {"arm": ["cortex-m3", "cortex-m4", "cortex-m7"]}
+platform_file = {'armcc': 'rvds.S', 'gcc': 'gcc.S', 'iar': 'iar.S'}
+
+if rtconfig.PLATFORM in platform_file.keys():	# support platforms
+    if rtconfig.ARCH in support_arch.keys() and rtconfig.CPU in support_arch[rtconfig.ARCH]:
+        # arch/arm/cortex-m7/lwp_gcc.S
+        asm_path = 'arch/' + rtconfig.ARCH + '/' + rtconfig.CPU + '/*_' + platform_file[rtconfig.PLATFORM]
+        src = Glob('*.c') + Glob(asm_path)
+        CPPPATH = [cwd]
+
+group = DefineGroup('lwP', src, depend = ['RT_USING_LWP'], CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/lwp/arch/arm/cortex-m3/lwp_gcc.S b/components/lwp/arch/arm/cortex-m3/lwp_gcc.S
new file mode 100644
index 0000000000..8c866f9990
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m3/lwp_gcc.S
@@ -0,0 +1,176 @@
+/*
+ * File      : lwp_gcc.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+.cpu cortex-m3
+.syntax unified
+.thumb
+.text
+
+/*
+ * void* lwp_get_sys_api(rt_uint32_t number);
+ */
+.global lwp_get_sys_api
+.global lwp_get_kernel_sp
+.global lwp_set_kernel_sp
+
+
+/*
+ * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+ */
+.global lwp_user_entry
+.type lwp_user_entry, % function
+lwp_user_entry:
+    PUSH    {R0 - R1}           /* push text&data addr. */
+
+    MOV     R0, SP              /* v1 = SP */
+    BL      lwp_set_kernel_sp   /* lwp_set_kernel_sp(v1) */
+
+    POP     {R0 - R1}           /* pop app address to R1. */
+
+    /* set CPU to user-thread mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       /* use PSP, user-thread mode. */
+    MSR     CONTROL, R2
+
+    /* set data address. */
+    MOV     R9, R1
+
+    /* run app, only Thumb-mode. */
+    ORR     R0, R0, #0x01
+    BX      R0
+
+/*
+ * void SVC_Handler(void);
+ */
+.global SVC_Handler
+.type SVC_Handler, % function
+SVC_Handler:
+
+    PUSH    {LR}
+
+    /* get user SP. */
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                    /* push app SP. */
+    MOV     R2, R1
+
+    STMFD   R2!, {R4 - R11}     /* push app R4-R11 to app stack , and R1 not change. */
+
+    /* get SVC number. */
+    LDR     R0, [R1, #24]       /* get the app LR. */
+    LDRB    R0, [R0, #-2]       /* get the SVC No. from instruction. */
+
+    /* get kernel system API */
+    BL      lwp_get_sys_api
+
+    /* if(api == NULL) return; */
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    /* push api */
+    PUSH    {R0}
+
+    /* get kernel SP to R0. */
+    BL lwp_get_kernel_sp
+
+    POP     {R2}            /* pop api to R2. */
+    POP     {R1}            /* pop app SP to R1. */
+
+    /* copy R1(app SP) to R0(server SP). */
+    LDMFD   R1,   {R4 - R11}        /* pop exception_stack_frame to r4 - r11 register */
+    STMFD   R0!,  {R4 - R11}        /* push exception_stack_frame to server SP. */
+
+    POP     {LR}
+    PUSH    {LR}
+
+    /* save app SP. */
+    PUSH    {R0 - R3}
+    SUB     R0, R1, #0x20       /* keep {R4 - R11} */
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    /* set to thread-privilege mode. */
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    /* call api. */
+    LDR     R3, = svc_exit
+    STR     R3, [R0, #20]       /* update LR */
+    STR     R2, [R0, #24]       /* update api to PC */
+    MSR     PSP, R0         /* update stack pointer */
+    POP     {LR}            /* 0xFFFFFFED */
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+/*
+* void svc_exit(void);
+*/
+.global svc_exit
+.type svc_exit, % function
+svc_exit:
+
+    /* get user SP. */
+    PUSH    {R0}                        /* push result to SP. */
+    BL      lwp_get_kernel_sp
+
+    LDMFD   R0!, {R4 - R11}             /* pop app {R4 - R11} */
+
+    ADD     R0, R0, #16                 /* skip R0-R3 */
+    LDMFD   R0!, {R12, LR}
+    LDMFD   R0!, {R1}                   /* pop PC to R1 */
+    LDMFD   R0!, {R2}                   /* pop PSR to R2 */
+
+    /* align to 2 words */
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                        /* push user-SP to SP */
+
+    /* save server SP. */
+    ADD     R0, SP, #0x08               /* [user-SP, result] */
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                        /* pop user-SP to R3 */
+    POP     {R0}                        /* restore API result. */
+
+    MSR     APSR, R2                    /* restore PSR */
+    MSR     PSP, R3                     /* restore app stack pointer */
+
+    /* restore to PSP & thread-unprivilege mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    /* return to lwp. */
+    ORR     R1, R1, #0x01               /* only Thumb-mode. */
+    BX      R1                          /* return to user app. */
diff --git a/components/lwp/arch/arm/cortex-m3/lwp_iar.S b/components/lwp/arch/arm/cortex-m3/lwp_iar.S
new file mode 100644
index 0000000000..e00424cbec
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m3/lwp_iar.S
@@ -0,0 +1,176 @@
+;/*
+; * File      : lwp_iar.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    SECTION    .text:CODE(2)
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+    EXPORT  lwp_user_entry
+lwp_user_entry:
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+;/*
+; * void SVC_Handler(void);
+; */
+    EXPORT SVC_Handler
+SVC_Handler:
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0         
+    ITTT    EQ
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+;/*
+; * void svc_exit(void);
+; */
+    EXPORT svc_exit
+svc_exit:
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    END
diff --git a/components/lwp/arch/arm/cortex-m3/lwp_rvds.S b/components/lwp/arch/arm/cortex-m3/lwp_rvds.S
new file mode 100644
index 0000000000..ff79cfda4b
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m3/lwp_rvds.S
@@ -0,0 +1,184 @@
+;/*
+; * File      : lwp_rvds.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    AREA |.text|, CODE, READONLY, ALIGN=2
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+lwp_user_entry    PROC
+    EXPORT  lwp_user_entry
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+    ; never reach here!
+    ENDP
+
+;/*
+; * void SVC_Handler(void);
+; */
+SVC_Handler    PROC
+    EXPORT SVC_Handler
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+    ENDP
+
+;/*
+; * void svc_exit(void);
+; */
+svc_exit     PROC
+    EXPORT svc_exit
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    ENDP
+
+    ALIGN
+
+    END
diff --git a/components/lwp/arch/arm/cortex-m4/lwp_gcc.S b/components/lwp/arch/arm/cortex-m4/lwp_gcc.S
new file mode 100644
index 0000000000..fd46d6142d
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m4/lwp_gcc.S
@@ -0,0 +1,210 @@
+/*
+ * File      : lwp_gcc.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+.cpu cortex-m4
+.syntax unified
+.thumb
+.text
+
+/*
+ * void* lwp_get_sys_api(rt_uint32_t number);
+ */
+.global lwp_get_sys_api
+.global lwp_get_kernel_sp
+.global lwp_set_kernel_sp
+
+
+/*
+ * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+ */
+.global lwp_user_entry
+.type lwp_user_entry, % function
+lwp_user_entry:
+    PUSH    {R0 - R1}           /* push text&data addr. */
+
+    MOV     R0, SP              /* v1 = SP */
+    BL      lwp_set_kernel_sp   /* lwp_set_kernel_sp(v1) */
+
+    POP     {R0 - R1}           /* pop app address to R1. */
+
+    /* set CPU to user-thread mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       /* use PSP, user-thread mode. */
+    MSR     CONTROL, R2
+
+    /* set data address. */
+    MOV     R9, R1
+
+    /* run app, only Thumb-mode. */
+    ORR     R0, R0, #0x01
+    BX      R0
+
+/*
+ * void SVC_Handler(void);
+ */
+.global SVC_Handler
+.type SVC_Handler, % function
+SVC_Handler:
+
+    PUSH    {LR}
+
+    /* get user SP. */
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                    /* push app SP. */
+    MOV     R2, R1
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    TST       LR, #0x10
+    VSTMDBEQ  R2!, {D8 - D15}
+#endif
+
+    STMFD   R2!, {R4 - R11}     /* push app R4-R11 to app stack , and R1 not change. */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    MOV     R4, #0x00                   /* flag = 0 */
+    TST     LR, #0x10                   /* if(!EXC_RETURN[4]) */
+    MOVEQ   R4, #0x01                   /* flag = 1 */
+    STMFD   R2!, {R4}                   /* push flag */
+#endif
+
+    /* get SVC number. */
+    LDR     R0, [R1, #24]       /* get the app LR. */
+    LDRB    R0, [R0, #-2]       /* get the SVC No. from instruction. */
+
+    /* get kernel system API */
+    BL      lwp_get_sys_api
+
+    /* if(api == NULL) return; */
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    /* push api */
+    PUSH    {R0}
+
+    /* get kernel SP to R0. */
+    BL lwp_get_kernel_sp
+
+    POP     {R2}            /* pop api to R2. */
+    POP     {R1}            /* pop app SP to R1. */
+
+    /* copy R1(app SP) to R0(server SP). */
+    LDMFD   R1,   {R4 - R11}        /* pop exception_stack_frame to r4 - r11 register */
+    STMFD   R0!,  {R4 - R11}        /* push exception_stack_frame to server SP. */
+
+    POP     {LR}
+    PUSH    {LR}
+
+    /* save app SP. */
+    PUSH    {R0 - R3}
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    TST     LR, #0x10
+    SUBEQ   R0, R1, #0x64       /* keep {R4 - R11}, {D8-D15}, FLAG */
+    SUBNE   R0, R1, #0x24       /* keep {R4 - R11}, FLAG */
+#else
+    SUB     R0, R1, #0x20       /* keep {R4 - R11} */
+#endif
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    /* set to thread-privilege mode. */
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    /* call api. */
+    LDR     R3, = svc_exit
+    STR     R3, [R0, #20]       /* update LR */
+    STR     R2, [R0, #24]       /* update api to PC */
+    MSR     PSP, R0         /* update stack pointer */
+    POP     {LR}            /* 0xFFFFFFED */
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+/*
+* void svc_exit(void);
+*/
+.global svc_exit
+.type svc_exit, % function
+svc_exit:
+
+    /* get user SP. */
+    PUSH    {R0}                        /* push result to SP. */
+    BL      lwp_get_kernel_sp
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    LDMFD   R0!, {R3}                   /* pop flag */
+#endif
+
+    LDMFD   R0!, {R4 - R11}             /* pop app {R4 - R11} */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    CMP     R3,  #0                     /* if(flag_r3 != 0) */
+    VLDMIANE  R0!, {D8 - D15}           /* pop FPU register s16~s31 */
+#endif
+
+    ADD     R0, R0, #16                 /* skip R0-R3 */
+    LDMFD   R0!, {R12, LR}
+    LDMFD   R0!, {R1}                   /* pop PC to R1 */
+    LDMFD   R0!, {R2}                   /* pop PSR to R2 */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    CMP     R3,  #0                     /* if(flag_r3 != 0) */
+    VLDMIANE  R0!, {D0 - D7}            /* pop FPU register s16~s31 */
+    LDMIANE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+#endif
+
+    /* align to 2 words */
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                        /* push user-SP to SP */
+
+    /* save server SP. */
+    ADD     R0, SP, #0x08               /* [user-SP, result] */
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                        /* pop user-SP to R3 */
+    POP     {R0}                        /* restore API result. */
+
+    MSR     APSR, R2                    /* restore PSR */
+    MSR     PSP, R3                     /* restore app stack pointer */
+
+    /* restore to PSP & thread-unprivilege mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    /* return to lwp. */
+    ORR     R1, R1, #0x01               /* only Thumb-mode. */
+    BX      R1                          /* return to user app. */
diff --git a/components/lwp/arch/arm/cortex-m4/lwp_iar.S b/components/lwp/arch/arm/cortex-m4/lwp_iar.S
new file mode 100644
index 0000000000..27ca8778e0
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m4/lwp_iar.S
@@ -0,0 +1,215 @@
+;/*
+; * File      : lwp_iar.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    SECTION    .text:CODE(2)
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+    EXPORT  lwp_user_entry
+lwp_user_entry:
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+;/*
+; * void SVC_Handler(void);
+; */
+    EXPORT SVC_Handler
+SVC_Handler:
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+#if defined ( __ARMVFP__ )
+    TST       LR, #0x10
+    IT        EQ
+    VSTMDBEQ    R2!, {D8 - D15}
+#endif
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+#if defined ( __ARMVFP__ )
+    MOV     R4, #0x00               ; flag = 0
+    TST     LR, #0x10               ; if(!EXC_RETURN[4])
+    IT      EQ
+    MOVEQ   R4, #0x01               ; flag = 1
+    STMFD   R2!, {R4}               ; push flag
+#endif
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0         
+    ITTT    EQ
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+#if defined ( __ARMVFP__ )
+    TST     LR, #0x10
+    ITE     EQ
+    SUBEQ   R0, R1, #0x64               ; keep {R4 - R11}, {D8-D15}, FLAG
+    SUBNE   R0, R1, #0x24               ; keep {R4 - R11}, FLAG
+#else
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+#endif
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+;/*
+; * void svc_exit(void);
+; */
+    EXPORT svc_exit
+svc_exit:
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+#if defined ( __ARMVFP__ )
+    LDMFD   R0!, {R3}               ; pop flag
+#endif
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+#if defined ( __ARMVFP__ )
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    IT      NE
+    VLDMIANE  R0!, {D8 - D15}       ; pop FPU register s16~s31
+#endif
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+#if defined ( __ARMVFP__ )
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    ITTT      NE
+    VLDMIANE  R0!, {D0 - D7}       ; pop FPU register s16~s31
+    LDMIANE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+#endif
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    END
diff --git a/components/lwp/arch/arm/cortex-m4/lwp_rvds.S b/components/lwp/arch/arm/cortex-m4/lwp_rvds.S
new file mode 100644
index 0000000000..16e81710c1
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m4/lwp_rvds.S
@@ -0,0 +1,219 @@
+;/*
+; * File      : lwp_rvds.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    AREA |.text|, CODE, READONLY, ALIGN=2
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+lwp_user_entry    PROC
+    EXPORT  lwp_user_entry
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+    ; never reach here!
+    ENDP
+
+;/*
+; * void SVC_Handler(void);
+; */
+SVC_Handler    PROC
+    EXPORT SVC_Handler
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+    IF      {FPU} != "SoftVFP"
+    TST       LR, #0x10
+    VSTMFDEQ  R2!, {D8 - D15}
+    ENDIF
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+    IF      {FPU} != "SoftVFP"
+    MOV     R4, #0x00               ; flag = 0
+    TST     LR, #0x10               ; if(!EXC_RETURN[4])
+    MOVEQ   R4, #0x01               ; flag = 1
+    STMFD   R2!, {R4}               ; push flag
+    ENDIF
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+    IF      {FPU} != "SoftVFP"
+    TST     LR, #0x10
+    SUBEQ   R0, R1, #0x64               ; keep {R4 - R11}, {D8-D15}, FLAG
+    SUBNE   R0, R1, #0x24               ; keep {R4 - R11}, FLAG
+    ELSE
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+    ENDIF
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+    ENDP
+
+;/*
+; * void svc_exit(void);
+; */
+svc_exit     PROC
+    EXPORT svc_exit
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+    IF      {FPU} != "SoftVFP"
+    LDMFD   R0!, {R3}               ; pop flag
+    ENDIF
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+    IF      {FPU} != "SoftVFP"
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    VLDMFDNE  R0!, {D8 - D15}       ; pop FPU register s16~s31
+    ENDIF
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+    IF      {FPU} != "SoftVFP"
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    VLDMFDNE  R0!, {D0 - D7}       ; pop FPU register s16~s31
+    LDMFDNE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+
+    ENDIF
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    ENDP
+
+    ALIGN
+
+    END
diff --git a/components/lwp/arch/arm/cortex-m7/lwp_gcc.S b/components/lwp/arch/arm/cortex-m7/lwp_gcc.S
new file mode 100644
index 0000000000..fd46d6142d
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m7/lwp_gcc.S
@@ -0,0 +1,210 @@
+/*
+ * File      : lwp_gcc.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+.cpu cortex-m4
+.syntax unified
+.thumb
+.text
+
+/*
+ * void* lwp_get_sys_api(rt_uint32_t number);
+ */
+.global lwp_get_sys_api
+.global lwp_get_kernel_sp
+.global lwp_set_kernel_sp
+
+
+/*
+ * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+ */
+.global lwp_user_entry
+.type lwp_user_entry, % function
+lwp_user_entry:
+    PUSH    {R0 - R1}           /* push text&data addr. */
+
+    MOV     R0, SP              /* v1 = SP */
+    BL      lwp_set_kernel_sp   /* lwp_set_kernel_sp(v1) */
+
+    POP     {R0 - R1}           /* pop app address to R1. */
+
+    /* set CPU to user-thread mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       /* use PSP, user-thread mode. */
+    MSR     CONTROL, R2
+
+    /* set data address. */
+    MOV     R9, R1
+
+    /* run app, only Thumb-mode. */
+    ORR     R0, R0, #0x01
+    BX      R0
+
+/*
+ * void SVC_Handler(void);
+ */
+.global SVC_Handler
+.type SVC_Handler, % function
+SVC_Handler:
+
+    PUSH    {LR}
+
+    /* get user SP. */
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                    /* push app SP. */
+    MOV     R2, R1
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    TST       LR, #0x10
+    VSTMDBEQ  R2!, {D8 - D15}
+#endif
+
+    STMFD   R2!, {R4 - R11}     /* push app R4-R11 to app stack , and R1 not change. */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    MOV     R4, #0x00                   /* flag = 0 */
+    TST     LR, #0x10                   /* if(!EXC_RETURN[4]) */
+    MOVEQ   R4, #0x01                   /* flag = 1 */
+    STMFD   R2!, {R4}                   /* push flag */
+#endif
+
+    /* get SVC number. */
+    LDR     R0, [R1, #24]       /* get the app LR. */
+    LDRB    R0, [R0, #-2]       /* get the SVC No. from instruction. */
+
+    /* get kernel system API */
+    BL      lwp_get_sys_api
+
+    /* if(api == NULL) return; */
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    /* push api */
+    PUSH    {R0}
+
+    /* get kernel SP to R0. */
+    BL lwp_get_kernel_sp
+
+    POP     {R2}            /* pop api to R2. */
+    POP     {R1}            /* pop app SP to R1. */
+
+    /* copy R1(app SP) to R0(server SP). */
+    LDMFD   R1,   {R4 - R11}        /* pop exception_stack_frame to r4 - r11 register */
+    STMFD   R0!,  {R4 - R11}        /* push exception_stack_frame to server SP. */
+
+    POP     {LR}
+    PUSH    {LR}
+
+    /* save app SP. */
+    PUSH    {R0 - R3}
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    TST     LR, #0x10
+    SUBEQ   R0, R1, #0x64       /* keep {R4 - R11}, {D8-D15}, FLAG */
+    SUBNE   R0, R1, #0x24       /* keep {R4 - R11}, FLAG */
+#else
+    SUB     R0, R1, #0x20       /* keep {R4 - R11} */
+#endif
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    /* set to thread-privilege mode. */
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    /* call api. */
+    LDR     R3, = svc_exit
+    STR     R3, [R0, #20]       /* update LR */
+    STR     R2, [R0, #24]       /* update api to PC */
+    MSR     PSP, R0         /* update stack pointer */
+    POP     {LR}            /* 0xFFFFFFED */
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+/*
+* void svc_exit(void);
+*/
+.global svc_exit
+.type svc_exit, % function
+svc_exit:
+
+    /* get user SP. */
+    PUSH    {R0}                        /* push result to SP. */
+    BL      lwp_get_kernel_sp
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    LDMFD   R0!, {R3}                   /* pop flag */
+#endif
+
+    LDMFD   R0!, {R4 - R11}             /* pop app {R4 - R11} */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    CMP     R3,  #0                     /* if(flag_r3 != 0) */
+    VLDMIANE  R0!, {D8 - D15}           /* pop FPU register s16~s31 */
+#endif
+
+    ADD     R0, R0, #16                 /* skip R0-R3 */
+    LDMFD   R0!, {R12, LR}
+    LDMFD   R0!, {R1}                   /* pop PC to R1 */
+    LDMFD   R0!, {R2}                   /* pop PSR to R2 */
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    CMP     R3,  #0                     /* if(flag_r3 != 0) */
+    VLDMIANE  R0!, {D0 - D7}            /* pop FPU register s16~s31 */
+    LDMIANE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+#endif
+
+    /* align to 2 words */
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                        /* push user-SP to SP */
+
+    /* save server SP. */
+    ADD     R0, SP, #0x08               /* [user-SP, result] */
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                        /* pop user-SP to R3 */
+    POP     {R0}                        /* restore API result. */
+
+    MSR     APSR, R2                    /* restore PSR */
+    MSR     PSP, R3                     /* restore app stack pointer */
+
+    /* restore to PSP & thread-unprivilege mode. */
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    /* return to lwp. */
+    ORR     R1, R1, #0x01               /* only Thumb-mode. */
+    BX      R1                          /* return to user app. */
diff --git a/components/lwp/arch/arm/cortex-m7/lwp_iar.S b/components/lwp/arch/arm/cortex-m7/lwp_iar.S
new file mode 100644
index 0000000000..27ca8778e0
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m7/lwp_iar.S
@@ -0,0 +1,215 @@
+;/*
+; * File      : lwp_iar.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    SECTION    .text:CODE(2)
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+    EXPORT  lwp_user_entry
+lwp_user_entry:
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+;/*
+; * void SVC_Handler(void);
+; */
+    EXPORT SVC_Handler
+SVC_Handler:
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+#if defined ( __ARMVFP__ )
+    TST       LR, #0x10
+    IT        EQ
+    VSTMDBEQ    R2!, {D8 - D15}
+#endif
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+#if defined ( __ARMVFP__ )
+    MOV     R4, #0x00               ; flag = 0
+    TST     LR, #0x10               ; if(!EXC_RETURN[4])
+    IT      EQ
+    MOVEQ   R4, #0x01               ; flag = 1
+    STMFD   R2!, {R4}               ; push flag
+#endif
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0         
+    ITTT    EQ
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+#if defined ( __ARMVFP__ )
+    TST     LR, #0x10
+    ITE     EQ
+    SUBEQ   R0, R1, #0x64               ; keep {R4 - R11}, {D8-D15}, FLAG
+    SUBNE   R0, R1, #0x24               ; keep {R4 - R11}, FLAG
+#else
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+#endif
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+;/*
+; * void svc_exit(void);
+; */
+    EXPORT svc_exit
+svc_exit:
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+#if defined ( __ARMVFP__ )
+    LDMFD   R0!, {R3}               ; pop flag
+#endif
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+#if defined ( __ARMVFP__ )
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    IT      NE
+    VLDMIANE  R0!, {D8 - D15}       ; pop FPU register s16~s31
+#endif
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+#if defined ( __ARMVFP__ )
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    ITTT      NE
+    VLDMIANE  R0!, {D0 - D7}       ; pop FPU register s16~s31
+    LDMIANE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+#endif
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    END
diff --git a/components/lwp/arch/arm/cortex-m7/lwp_rvds.S b/components/lwp/arch/arm/cortex-m7/lwp_rvds.S
new file mode 100644
index 0000000000..16e81710c1
--- /dev/null
+++ b/components/lwp/arch/arm/cortex-m7/lwp_rvds.S
@@ -0,0 +1,219 @@
+;/*
+; * File      : lwp_rvds.S
+; * This file is part of RT-Thread RTOS
+; * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+; *
+; *  This program is free software; you can redistribute it and/or modify
+; *  it under the terms of the GNU General Public License as published by
+; *  the Free Software Foundation; either version 2 of the License, or
+; *  (at your option) any later version.
+; *
+; *  This program is distributed in the hope that it will be useful,
+; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; *  GNU General Public License for more details.
+; *
+; *  You should have received a copy of the GNU General Public License along
+; *  with this program; if not, write to the Free Software Foundation, Inc.,
+; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; *
+; * Change Logs:
+; * Date           Author       Notes
+; */
+
+    AREA |.text|, CODE, READONLY, ALIGN=2
+    THUMB
+    REQUIRE8
+    PRESERVE8
+
+;/*
+; * void* lwp_get_sys_api(rt_uint32_t number);
+; */
+    IMPORT lwp_get_sys_api
+    IMPORT lwp_get_kernel_sp
+    IMPORT lwp_set_kernel_sp
+
+;/*
+; * void lwp_user_entry(u32 R0_text_addr, u32 R1_data_addr);
+; */
+lwp_user_entry    PROC
+    EXPORT  lwp_user_entry
+
+    PUSH    {R0-R1}             ; push text&data addr.
+
+    MOV     R0, SP              ; v1 = SP
+    BL      lwp_set_kernel_sp   ; lwp_set_kernel_sp(v1)
+
+    POP     {R0-R1}             ; pop app address to R1.
+
+    ; set CPU to user-thread mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03       ; use PSP, user-thread mode.
+    MSR     CONTROL, R2
+
+    ; set data address.
+    MOV     R9, R1
+
+    ; run app, only Thumb-mode.
+    ORR     R0, R0, #0x01
+    BX      R0
+
+    ; never reach here!
+    ENDP
+
+;/*
+; * void SVC_Handler(void);
+; */
+SVC_Handler    PROC
+    EXPORT SVC_Handler
+
+    PUSH    {LR}
+
+    ; get user SP.
+    TST     LR, #0x4
+    ITE     EQ
+    MRSEQ   R1, MSP
+    MRSNE   R1, PSP
+
+    PUSH    {R1}                        ; push app SP.
+    MOV     R2, R1
+
+    IF      {FPU} != "SoftVFP"
+    TST       LR, #0x10
+    VSTMFDEQ  R2!, {D8 - D15}
+    ENDIF
+
+    STMFD   R2!, {R4 - R11}              ; push app R4-R11 to app stack , and R1 not change.
+
+    IF      {FPU} != "SoftVFP"
+    MOV     R4, #0x00               ; flag = 0
+    TST     LR, #0x10               ; if(!EXC_RETURN[4])
+    MOVEQ   R4, #0x01               ; flag = 1
+    STMFD   R2!, {R4}               ; push flag
+    ENDIF
+
+    ; get SVC number.
+    LDR     R0, [R1, #24]               ; get the app LR.
+    LDRB    R0, [R0, #-2]               ; get the SVC No. from instruction.
+
+    ; get kernel system API
+    BL      lwp_get_sys_api
+
+    ; if(api == NULL) return;
+    CMP     R0, #0
+    POPEQ   {R1}
+    POPEQ   {LR}
+    BXEQ    LR
+
+    ; push api
+    PUSH    {R0}
+
+    ; get kernel SP to R0.
+    BL lwp_get_kernel_sp
+
+    POP     {R2}                        ; pop api to R2.
+    POP     {R1}                        ; pop app SP to R1.
+
+    ; copy R1(app SP) to R0(server SP).
+    LDMFD   R1,   {R4 - R11}     ; pop exception_stack_frame to r4 - r11 register
+    STMFD   R0!,  {R4 - R11}     ; push exception_stack_frame to server SP.
+
+    POP     {LR}
+    PUSH    {LR}
+
+    ; save app SP.
+    PUSH    {R0 - R3}
+    IF      {FPU} != "SoftVFP"
+    TST     LR, #0x10
+    SUBEQ   R0, R1, #0x64               ; keep {R4 - R11}, {D8-D15}, FLAG
+    SUBNE   R0, R1, #0x24               ; keep {R4 - R11}, FLAG
+    ELSE
+    SUB     R0, R1, #0x20               ; keep {R4 - R11}
+    ENDIF
+    BL      lwp_set_kernel_sp
+    POP     {R0 - R3}
+
+    ; set to thread-privilege mode.
+    MRS     R3, CONTROL
+    BIC     R3, R3, #0x01
+    ORR     R3, R3, #0x02
+    MSR     CONTROL, R3
+
+    ; call api.
+    LDR     R3, =svc_exit
+    STR     R3, [R0, #20]       ; update LR
+    STR     R2, [R0, #24]       ; update api to PC
+    MSR     PSP, R0             ; update stack pointer
+    POP     {LR}                ; 0xFFFFFFED
+
+    ORR     LR, LR, #0x10
+
+    BX      LR
+
+    ENDP
+
+;/*
+; * void svc_exit(void);
+; */
+svc_exit     PROC
+    EXPORT svc_exit
+
+    ; get user SP.
+    PUSH    {R0}                    ; push result to SP.
+    BL      lwp_get_kernel_sp
+
+    IF      {FPU} != "SoftVFP"
+    LDMFD   R0!, {R3}               ; pop flag
+    ENDIF
+
+    LDMFD   R0!, {R4 - R11}         ; pop app {R4 - R11}
+
+    IF      {FPU} != "SoftVFP"
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    VLDMFDNE  R0!, {D8 - D15}       ; pop FPU register s16~s31
+    ENDIF
+
+    ADD     R0, R0, #16             ; skip R0-R3
+    LDMFD   R0!, {R12, LR}          ;
+    LDMFD   R0!, {R1}               ; pop PC to R1
+    LDMFD   R0!, {R2}               ; pop PSR to R2
+
+    IF      {FPU} != "SoftVFP"
+    CMP     R3,  #0                 ; if(flag_r3 != 0)
+    VLDMFDNE  R0!, {D0 - D7}       ; pop FPU register s16~s31
+    LDMFDNE   R0!, {R3}
+    VMSRNE    FPSCR,  R3
+
+    ENDIF
+
+    ; align to 2 words
+    ADD     R0, R0, #0x07
+    BIC     R0, R0, #0x07
+    PUSH    {R0}                    ; push user-SP to SP
+
+    ; save server SP.
+    ADD     R0, SP, #0x08           ; [user-SP, result]
+    PUSH    {R1 - R2, LR}
+    BL      lwp_set_kernel_sp
+    POP     {R1 - R2, LR}
+
+    POP     {R3}                    ; pop user-SP to R3
+    POP     {R0}                    ; restore API result.
+
+    MSR     APSR, R2                ; restore PSR
+    MSR     PSP, R3                 ; restore app stack pointer
+
+    ; restore to PSP & thread-unprivilege mode.
+    MRS     R2, CONTROL
+    ORR     R2, R2, #0x03
+    MSR     CONTROL, R2
+
+    ; return to lwp.
+    ORR     R1, R1, #0x01           ; only Thumb-mode.
+    BX      R1                      ; return to user app.
+
+    ENDP
+
+    ALIGN
+
+    END
diff --git a/components/lwp/lwp.c b/components/lwp/lwp.c
new file mode 100644
index 0000000000..6837e30b53
--- /dev/null
+++ b/components/lwp/lwp.c
@@ -0,0 +1,364 @@
+/*
+ * File      : clock.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <dfs_posix.h>
+
+#ifdef RT_USING_FINSH
+    #include <finsh.h>
+#endif
+
+#ifndef RT_USING_DFS
+    #error  "lwp need file system(RT_USING_DFS)"
+#endif
+
+#include "lwp.h"
+
+#define DBG_ENABLE
+#define DBG_SECTION_NAME    "[LWP]"
+#define DBG_COLOR
+#define DBG_LEVEL           DBG_LOG
+#include <rtdbg.h>
+
+extern rt_thread_t rt_current_thread;
+extern void lwp_user_entry(const void *text, void *data);
+
+/**
+ * RT-Thread light-weight process
+ */
+void lwp_set_kernel_sp(uint32_t *sp)
+{
+    struct rt_lwp *user_data;
+    user_data = (struct rt_lwp *)rt_current_thread->user_data;
+    user_data->kernel_sp = sp;
+}
+
+uint32_t *lwp_get_kernel_sp(void)
+{
+    struct rt_lwp *user_data;
+    user_data = (struct rt_lwp *)rt_current_thread->user_data;
+
+    return user_data->kernel_sp;
+}
+
+static int lwp_load(const char *filename, struct rt_lwp *lwp, uint8_t *load_addr, size_t addr_size)
+{
+    int fd;
+    uint8_t *ptr;
+    int result = RT_EOK;
+    int nbytes;
+    struct lwp_header header;
+    struct lwp_chunk  chunk;
+
+    /* check file name */
+    RT_ASSERT(filename != RT_NULL);
+    /* check lwp control block */
+    RT_ASSERT(lwp != RT_NULL);
+
+    memset(lwp, 0x00, sizeof(struct rt_lwp));
+
+    if (load_addr != RT_NULL)
+    {
+        lwp->lwp_type = LWP_TYPE_FIX_ADDR;
+        ptr = load_addr;
+    }
+    else
+    {
+        lwp->lwp_type = LWP_TYPE_DYN_ADDR;
+        ptr = RT_NULL;
+    }
+
+    /* open lwp */
+    fd = open(filename, 0, O_RDONLY);
+    if (fd < 0)
+    {
+        dbg_log(DBG_ERROR, "open file:%s failed!\n", filename);
+        result = -RT_ENOSYS;
+        goto _exit;
+    }
+
+    /* read lwp header */
+    nbytes = read(fd, &header, sizeof(struct lwp_header));
+    if (nbytes != sizeof(struct lwp_header))
+    {
+        dbg_log(DBG_ERROR, "read lwp header return error size: %d!\n", nbytes);
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    /* check file header */
+    if (header.magic != LWP_MAGIC)
+    {
+        dbg_log(DBG_ERROR, "erro header magic number: 0x%02X\n", header.magic);
+        result = -RT_EINVAL;
+        goto _exit;
+    }
+
+    /* read text chunk info */
+    nbytes = read(fd, &chunk, sizeof(struct lwp_chunk));
+    if (nbytes != sizeof(struct lwp_chunk))
+    {
+        dbg_log(DBG_ERROR, "read text chunk info failed!\n");
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    dbg_log(DBG_LOG, "chunk name: %s, total len %d, data %d, need space %d!\n",
+            "text", /*chunk.name*/ chunk.total_len, chunk.data_len, chunk.data_len_space);
+
+    /* load text */
+    {
+        lwp->text_size = RT_ALIGN(chunk.data_len_space, 4);
+        if (load_addr)
+            lwp->text_entry = ptr;
+        else
+        {
+#ifdef RT_USING_CACHE
+            lwp->text_entry = (rt_uint8_t *)rt_malloc_align(lwp->text_size, RT_CPU_CACHE_LINE_SZ);
+#else
+            lwp->text_entry = (rt_uint8_t *)rt_malloc(lwp->text_size);
+#endif
+
+            if (lwp->text_entry == RT_NULL)
+            {
+                dbg_log(DBG_ERROR, "alloc text memory faild!\n");
+                result = -RT_ENOMEM;
+                goto _exit;
+            }
+            else
+            {
+                dbg_log(DBG_LOG, "lwp text malloc : %p, size: %d!\n", lwp->text_entry, lwp->text_size);
+            }
+        }
+        dbg_log(DBG_INFO, "load text %d  => (0x%08x, 0x%08x)\n", lwp->text_size, (uint32_t)lwp->text_entry, (uint32_t)lwp->text_entry + lwp->text_size);
+
+        nbytes = read(fd, lwp->text_entry, chunk.data_len);
+        if (nbytes != chunk.data_len)
+        {
+            dbg_log(DBG_ERROR, "read text region from file failed!\n");
+            result = -RT_EIO;
+            goto _exit;
+        }
+#ifdef RT_USING_CACHE
+        else
+        {
+            rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, lwp->text_entry, lwp->text_size);
+            rt_hw_cpu_icache_ops(RT_HW_CACHE_INVALIDATE, lwp->text_entry, lwp->text_size);
+        }
+#endif
+
+        if (ptr != RT_NULL) ptr += nbytes;
+
+        /* skip text hole */
+        if ((chunk.total_len - sizeof(struct lwp_chunk) - chunk.data_len))
+        {
+            dbg_log(DBG_LOG, "skip text hole %d!\n", (chunk.total_len - sizeof(struct lwp_chunk) - chunk.data_len));
+            lseek(fd, (chunk.total_len - sizeof(struct lwp_chunk) - chunk.data_len), SEEK_CUR);
+        }
+    }
+
+    /* load data */
+    nbytes = read(fd, &chunk, sizeof(struct lwp_chunk));
+    if (nbytes != sizeof(struct lwp_chunk))
+    {
+        dbg_log(DBG_ERROR, "read data chunk info failed!\n");
+        result = -RT_EIO;
+        goto _exit;
+    }
+
+    dbg_log(DBG_LOG, "chunk name: %s, total len %d, data %d, need space %d!\n",
+            chunk.name, chunk.total_len, chunk.data_len, chunk.data_len_space);
+
+    {
+        lwp->data_size = RT_ALIGN(chunk.data_len_space, 4);
+        if (load_addr)
+            lwp->data = ptr;
+        else
+        {
+            lwp->data = rt_malloc(lwp->data_size);
+            if (lwp->data == RT_NULL)
+            {
+                dbg_log(DBG_ERROR, "alloc data memory faild!\n");
+                result = -RT_ENOMEM;
+                goto _exit;
+            }
+            else
+            {
+                dbg_log(DBG_LOG, "lwp data malloc : %p, size: %d!\n", lwp->data, lwp->data_size);
+                rt_memset(lwp->data, 0, lwp->data_size);
+            }
+        }
+
+        dbg_log(DBG_INFO, "load data %d => (0x%08x, 0x%08x)\n", lwp->data_size, (uint32_t)lwp->data, (uint32_t)lwp->data + lwp->data_size);
+        nbytes = read(fd, lwp->data, chunk.data_len);
+        if (nbytes != chunk.data_len)
+        {
+            dbg_log(DBG_ERROR, "read data region from file failed!\n");
+            result = -RT_ERROR;
+            goto _exit;
+        }
+    }
+
+_exit:
+    if (fd >= 0)
+        close(fd);
+
+    if (result != RT_EOK)
+    {
+        if (lwp->lwp_type == LWP_TYPE_DYN_ADDR)
+        {
+            dbg_log(DBG_ERROR, "lwp dynamic load faild, %d\n", result);
+            if (lwp->text_entry)
+            {
+                dbg_log(DBG_LOG, "lwp text free: %p\n", lwp->text_entry);
+#ifdef RT_USING_CACHE
+                rt_free_align(lwp->text_entry);
+#else
+                rt_free(lwp->text_entry);
+#endif
+            }
+            if (lwp->data)
+            {
+                dbg_log(DBG_LOG, "lwp data free: %p\n", lwp->data);
+                rt_free(lwp->data);
+            }
+        }
+    }
+
+    return result;
+}
+
+static void lwp_cleanup(struct rt_thread *tid)
+{
+    struct rt_lwp *lwp;
+
+    dbg_log(DBG_INFO, "thread: %s, stack_addr: %08X\n", tid->name, tid->stack_addr);
+
+    lwp = (struct rt_lwp *)tid->user_data;
+
+    if (lwp->lwp_type == LWP_TYPE_DYN_ADDR)
+    {
+        dbg_log(DBG_INFO, "dynamic lwp\n");
+        if (lwp->text_entry)
+        {
+            dbg_log(DBG_LOG, "lwp text free: %p\n", lwp->text_entry);
+#ifdef RT_USING_CACHE
+            rt_free_align(lwp->text_entry);
+#else
+            rt_free(lwp->text_entry);
+#endif
+        }
+        if (lwp->data)
+        {
+            dbg_log(DBG_LOG, "lwp data free: %p\n", lwp->data);
+            rt_free(lwp->data);
+        }
+    }
+
+    dbg_log(DBG_LOG, "lwp free memory pages\n");
+    rt_lwp_mem_deinit(lwp);
+
+    dbg_log(DBG_LOG, "lwp free: %p\n", lwp);
+    rt_free(lwp);
+
+    /* TODO: cleanup fd table */
+}
+
+static void lwp_thread(void *parameter)
+{
+    volatile uint32_t tmp;
+    rt_thread_t tid;
+    struct rt_lwp *lwp;
+
+    rt_kprintf("%08x %08x\n", &tmp, tmp);
+
+    lwp = (struct rt_lwp *)parameter;
+    rt_lwp_mem_init(lwp);
+    tid = rt_thread_self();
+    tid->user_data = (rt_uint32_t)lwp;
+    tid->cleanup = lwp_cleanup;
+
+    lwp_user_entry(lwp->text_entry, lwp->data);
+}
+
+struct rt_lwp *rt_lwp_self(void)
+{
+    return (struct rt_lwp *)rt_thread_self()->user_data;
+}
+
+int exec(char *filename)
+{
+    struct rt_lwp *lwp;
+    int result;
+
+    if (filename == RT_NULL)
+        return -RT_ERROR;
+
+    lwp = (struct rt_lwp *)rt_malloc(sizeof(struct rt_lwp));
+    if (lwp == RT_NULL)
+    {
+        dbg_log(DBG_ERROR, "lwp struct out of memory!\n");
+        return -RT_ENOMEM;
+    }
+    dbg_log(DBG_INFO, "lwp malloc : %p, size: %d!\n", lwp, sizeof(struct rt_lwp));
+
+    rt_memset(lwp, 0, sizeof(*lwp));
+    result = lwp_load(filename, lwp, RT_NULL, 0);
+    if (result == RT_EOK)
+    {
+        rt_thread_t tid;
+
+        tid = rt_thread_create("user", lwp_thread, (void *)lwp,
+                               1024 * 4, 2, 200);
+        if (tid != RT_NULL)
+        {
+            dbg_log(DBG_LOG, "lwp kernel => (0x%08x, 0x%08x)\n", (rt_uint32_t)tid->stack_addr, (rt_uint32_t)tid->stack_addr + tid->stack_size);
+            rt_thread_startup(tid);
+            return RT_EOK;
+        }
+        else
+        {
+#ifdef RT_USING_CACHE
+            rt_free_align(lwp->text_entry);
+#else
+            rt_free(lwp->text_entry);
+#endif
+            rt_free(lwp->data);
+        }
+    }
+
+    rt_free(lwp);
+
+    return -RT_ERROR;
+}
+FINSH_FUNCTION_EXPORT(exec, loader a user app &run);
+
+int _exec(int argc, char **argv)
+{
+    if (argc != 2)
+        return -RT_ERROR;
+
+    return exec(argv[1]);
+}
+MSH_CMD_EXPORT_ALIAS(_exec, exec, loader a user app &run);
diff --git a/components/lwp/lwp.h b/components/lwp/lwp.h
new file mode 100644
index 0000000000..b1ce96455e
--- /dev/null
+++ b/components/lwp/lwp.h
@@ -0,0 +1,83 @@
+/*
+ * File      : lwp.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#ifndef __LWP_H__
+#define __LWP_H__
+
+#define LWP_MAGIC           0x5A
+
+#define LWP_TYPE_FIX_ADDR   0x01
+#define LWP_TYPE_DYN_ADDR   0x02
+
+#define LWP_ARG_MAX         8
+
+#include <stdint.h>
+#include <rtthread.h>
+#include <dfs.h>
+#include <lwp_memheap.h>
+
+struct rt_lwp
+{
+    uint8_t lwp_type;
+    uint8_t heap_cnt;
+    uint8_t reserv[2];
+
+    rt_list_t hlist;                                    /**< headp list */
+
+    uint8_t *text_entry;
+    uint32_t text_size;
+
+    uint8_t *data;
+    uint32_t data_size;
+
+    uint32_t *kernel_sp;                                /**< kernel stack point */
+    struct dfs_fdtable fdt;
+};
+
+struct lwp_header
+{
+    uint8_t magic;
+    uint8_t compress_encrypt_algo;
+    uint16_t reserved;
+
+    uint32_t crc32;
+};
+
+struct lwp_chunk
+{
+    uint32_t total_len;
+
+    char name[4];
+    uint32_t data_len;
+    uint32_t data_len_space;
+};
+
+extern struct rt_lwp *rt_lwp_self(void);
+
+extern void rt_lwp_mem_init(struct rt_lwp *lwp);
+extern void rt_lwp_mem_deinit(struct rt_lwp *lwp);
+extern void *rt_lwp_mem_malloc(rt_uint32_t size);
+extern void rt_lwp_mem_free(void *addr);
+extern void *rt_lwp_mem_realloc(void *rmem, rt_size_t newsize);
+
+#endif
diff --git a/components/lwp/lwp_mem.c b/components/lwp/lwp_mem.c
new file mode 100644
index 0000000000..95c95441b8
--- /dev/null
+++ b/components/lwp/lwp_mem.c
@@ -0,0 +1,232 @@
+/*
+ * File      : lwp_mem.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2012, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-03-24     Tanek        the first version
+ */
+
+#include <stdio.h>
+#include <rtthread.h>
+#include <lwp.h>
+
+#define DBG_ENABLE
+#define DBG_SECTION_NAME    "[LWPMEM]"
+#define DBG_COLOR
+#define DBG_LEVEL           DBG_LOG
+#include <rtdbg.h>
+
+// todo: remove repleat code
+#define RT_MEMHEAP_SIZE         RT_ALIGN(sizeof(struct rt_lwp_memheap_item), RT_ALIGN_SIZE)
+#define MEMITEM_SIZE(item)      ((rt_uint32_t)item->next - (rt_uint32_t)item - RT_MEMHEAP_SIZE)
+
+#ifndef LWP_MEM_PAGE_SIZE
+    #define LWP_MEM_PAGE_SIZE       (4 * 1024)
+#endif
+
+#ifndef LWP_MEM_MAX_PAGE_COUNT
+    #define LWP_MEM_MAX_PAGE_COUNT  (256 * 4)
+#endif
+
+static void *rt_lwp_malloc_page(struct rt_lwp *lwp, rt_size_t npages)
+{
+    void *chunk;
+    char name[6];
+    struct rt_lwp_memheap *lwp_heap;
+    rt_size_t page_cnt;
+
+    RT_ASSERT(lwp != RT_NULL);
+
+    page_cnt = lwp->heap_cnt + npages;
+    if (page_cnt > LWP_MEM_MAX_PAGE_COUNT)
+    {
+        dbg_log(DBG_ERROR, "alloc new page failed, lwp memory size out of limited: %d\n", page_cnt);
+        return RT_NULL;
+    }
+
+    lwp_heap = rt_malloc(sizeof(struct rt_lwp_memheap));
+    if (lwp_heap == RT_NULL)
+    {
+        dbg_log(DBG_ERROR, "alloc new page head failed, out of memory : %d\n", page_cnt);
+        return RT_NULL;
+    }
+
+    chunk = rt_malloc(npages * LWP_MEM_PAGE_SIZE);
+    if (chunk == RT_NULL)
+    {
+        dbg_log(DBG_ERROR, "alloc new page buffer failed, out of memory : %d\n", page_cnt);
+        rt_free(lwp_heap);
+        return RT_NULL;
+    }
+
+    dbg_log(DBG_LOG, "lwp alloc page: %d\n", npages);
+
+    sprintf(name, "lwp%02x", lwp->heap_cnt);
+    rt_lwp_memheap_init(lwp_heap, name, chunk, npages * LWP_MEM_PAGE_SIZE);
+
+    rt_list_insert_before(&lwp->hlist, &lwp_heap->mlist);
+
+    lwp->heap_cnt += npages;
+
+    return chunk;
+}
+
+static void rt_lwp_free_page(struct rt_lwp *lwp, struct rt_lwp_memheap *lwp_heap)
+{
+    rt_size_t npages;
+
+    RT_ASSERT(lwp != RT_NULL);
+    RT_ASSERT(lwp_heap != RT_NULL);
+    RT_ASSERT(lwp_heap->start_addr != RT_NULL);
+
+    npages = lwp_heap->pool_size / LWP_MEM_PAGE_SIZE;
+    lwp->heap_cnt -= npages;
+
+    dbg_log(DBG_LOG, "lwp free page: %d\n", npages);
+
+    rt_list_remove(&lwp_heap->mlist);
+
+    rt_free(lwp_heap->start_addr);
+    rt_free(lwp_heap);
+}
+
+void rt_lwp_mem_init(struct rt_lwp *lwp)
+{
+    RT_ASSERT(lwp != RT_NULL);
+    rt_list_init(&lwp->hlist);
+}
+
+void rt_lwp_mem_deinit(struct rt_lwp *lwp)
+{
+    struct rt_list_node *node;
+    
+    RT_ASSERT(lwp != RT_NULL);
+
+    for (node  = lwp->hlist.next; node != &(lwp->hlist); node = node->next)
+    {
+        struct rt_lwp_memheap *lwp_heap;
+        lwp_heap = rt_list_entry(node, struct rt_lwp_memheap, mlist);
+        
+        RT_ASSERT(lwp_heap != RT_NULL);
+
+        rt_lwp_free_page(lwp, lwp_heap);
+    }
+}
+
+void *rt_lwp_mem_malloc(rt_uint32_t size)
+{
+    struct rt_lwp *lwp;
+    struct rt_list_node *node;
+    void *addr = RT_NULL;
+    rt_uint32_t npages;
+
+    if (size == 0)
+        return RT_NULL;
+
+    lwp = rt_lwp_self();
+    RT_ASSERT(lwp != RT_NULL);
+
+    for (node  = lwp->hlist.next; node != &(lwp->hlist); node = node->next)
+    {
+        struct rt_lwp_memheap *lwp_heap;
+        lwp_heap = rt_list_entry(node, struct rt_lwp_memheap, mlist);
+
+        addr = rt_lwp_memheap_alloc(lwp_heap, size);
+        if (addr != RT_NULL)
+        {
+            dbg_log(DBG_LOG, "lwp alloc 0x%x/%d\n", addr, size);
+            return addr;
+        }
+    }
+
+    npages = (size + rt_lwp_memheap_unavailable_size_get() + LWP_MEM_PAGE_SIZE) / LWP_MEM_PAGE_SIZE;
+    if (RT_NULL != rt_lwp_malloc_page(lwp, npages))
+        return rt_lwp_mem_malloc(size);
+    else
+        return RT_NULL;
+}
+
+void rt_lwp_mem_free(void *addr)
+{
+    struct rt_lwp_memheap_item *header_ptr;
+    struct rt_lwp_memheap *lwp_heap;
+
+    if (addr == RT_NULL)
+        return ;
+
+    /* get memory item */
+    header_ptr = (struct rt_lwp_memheap_item *)((rt_uint8_t *)addr - RT_MEMHEAP_SIZE);
+    RT_ASSERT(header_ptr);
+    
+    lwp_heap = header_ptr->pool_ptr;
+    RT_ASSERT(lwp_heap);
+
+    dbg_log(DBG_LOG, "lwp free 0x%x\n", addr);
+    rt_lwp_memheap_free((void *)addr);
+
+    if (rt_lwp_memheap_is_empty(lwp_heap))
+    {
+        rt_lwp_free_page(rt_lwp_self(), lwp_heap);
+    }
+}
+
+void *rt_lwp_mem_realloc(void *rmem, rt_size_t newsize)
+{
+    void *new_ptr;
+    struct rt_lwp_memheap_item *header_ptr;
+
+    if (rmem == RT_NULL)
+        return rt_lwp_mem_malloc(newsize);
+
+    if (newsize == 0)
+    {
+        rt_lwp_mem_free(rmem);
+        return RT_NULL;
+    }
+
+    /* get old memory item */
+    header_ptr = (struct rt_lwp_memheap_item *)
+                 ((rt_uint8_t *)rmem - RT_MEMHEAP_SIZE);
+
+    new_ptr = rt_lwp_memheap_realloc(header_ptr->pool_ptr, rmem, newsize);
+    if (new_ptr == RT_NULL)
+    {
+        /* allocate memory block from other memheap */
+        new_ptr = rt_lwp_mem_malloc(newsize);
+        if (new_ptr != RT_NULL && rmem != RT_NULL)
+        {
+            rt_size_t oldsize;
+
+            /* get the size of old memory block */
+            oldsize = MEMITEM_SIZE(header_ptr);
+            if (newsize > oldsize)
+                rt_memcpy(new_ptr, rmem, oldsize);
+            else
+                rt_memcpy(new_ptr, rmem, newsize);
+
+            dbg_log(DBG_LOG, "lwp realloc with memcpy 0x%x -> 0x%x/%d\n", rmem, new_ptr, newsize);
+            rt_lwp_mem_free(rmem);
+
+        }
+    }
+
+    dbg_log(DBG_LOG, "lwp realloc in same address 0x%x/%d\n", rmem, newsize);
+
+    return new_ptr;
+}
diff --git a/components/lwp/lwp_mem.h b/components/lwp/lwp_mem.h
new file mode 100644
index 0000000000..117a18f677
--- /dev/null
+++ b/components/lwp/lwp_mem.h
@@ -0,0 +1,34 @@
+/*
+ * File      : lwp_mem.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#ifndef __LWP_MEM_H__
+#define __LWP_MEM_H__
+
+extern void rt_lwp_mem_init(struct rt_lwp *lwp);
+extern void rt_lwp_mem_deinit(struct rt_lwp *lwp);
+
+extern void *rt_lwp_mem_malloc(rt_uint32_t size);
+extern void rt_lwp_mem_free(void *addr);
+extern void *rt_lwp_mem_realloc(void *rmem, rt_size_t newsize);
+
+#endif
diff --git a/components/lwp/lwp_memheap.c b/components/lwp/lwp_memheap.c
new file mode 100644
index 0000000000..46ba667695
--- /dev/null
+++ b/components/lwp/lwp_memheap.c
@@ -0,0 +1,590 @@
+/*
+ * File      : lwp_memheap.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2012, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-04-10     Bernard      first implementation
+ * 2012-10-16     Bernard      add the mutex lock for heap object.
+ * 2012-12-29     Bernard      memheap can be used as system heap.
+ *                             change mutex lock to semaphore lock.
+ * 2013-04-10     Bernard      add rt_lwp_memheap_realloc function.
+ * 2013-05-24     Bernard      fix the rt_lwp_memheap_realloc issue.
+ * 2013-07-11     Grissiom     fix the memory block splitting issue.
+ * 2013-07-15     Grissiom     optimize rt_lwp_memheap_realloc
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <lwp.h>
+
+/* dynamic pool magic and mask */
+#define RT_MEMHEAP_MAGIC        0x1ea01ea0
+#define RT_MEMHEAP_MASK         0xfffffffe
+#define RT_MEMHEAP_USED         0x01
+#define RT_MEMHEAP_FREED        0x00
+
+#define RT_MEMHEAP_IS_USED(i)   ((i)->magic & RT_MEMHEAP_USED)
+#define RT_MEMHEAP_MINIALLOC    12
+
+#define RT_MEMHEAP_SIZE         RT_ALIGN(sizeof(struct rt_lwp_memheap_item), RT_ALIGN_SIZE)
+#define MEMITEM_SIZE(item)      ((rt_uint32_t)item->next - (rt_uint32_t)item - RT_MEMHEAP_SIZE)
+
+/*
+ * The initialized memory pool will be:
+ * +-----------------------------------+--------------------------+
+ * | whole freed memory block          | Used Memory Block Tailer |
+ * +-----------------------------------+--------------------------+
+ *
+ * block_list --> whole freed memory block
+ *
+ * The length of Used Memory Block Tailer is 0,
+ * which is prevents block merging across list
+ */
+rt_err_t rt_lwp_memheap_init(struct rt_lwp_memheap *memheap,
+                         const char        *name,
+                         void              *start_addr,
+                         rt_uint32_t        size)
+{
+    struct rt_lwp_memheap_item *item;
+
+    RT_ASSERT(memheap != RT_NULL);
+
+    /* initialize pool object */
+    memheap->start_addr     = start_addr;
+    memheap->pool_size      = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
+    memheap->available_size = memheap->pool_size - (2 * RT_MEMHEAP_SIZE);
+    memheap->max_used_size  = memheap->pool_size - memheap->available_size;
+
+    /* initialize the free list header */
+    item            = &(memheap->free_header);
+    item->magic     = RT_MEMHEAP_MAGIC;
+    item->pool_ptr  = memheap;
+    item->next      = RT_NULL;
+    item->prev      = RT_NULL;
+    item->next_free = item;
+    item->prev_free = item;
+
+    /* set the free list to free list header */
+    memheap->free_list = item;
+
+    /* initialize the first big memory block */
+    item            = (struct rt_lwp_memheap_item *)start_addr;
+    item->magic     = RT_MEMHEAP_MAGIC;
+    item->pool_ptr  = memheap;
+    item->next      = RT_NULL;
+    item->prev      = RT_NULL;
+    item->next_free = item;
+    item->prev_free = item;
+
+    item->next = (struct rt_lwp_memheap_item *)
+                 ((rt_uint8_t *)item + memheap->available_size + RT_MEMHEAP_SIZE);
+    item->prev = item->next;
+
+    /* block list header */
+    memheap->block_list = item;
+
+    /* place the big memory block to free list */
+    item->next_free = memheap->free_list->next_free;
+    item->prev_free = memheap->free_list;
+    memheap->free_list->next_free->prev_free = item;
+    memheap->free_list->next_free            = item;
+
+    /* move to the end of memory pool to build a small tailer block,
+     * which prevents block merging
+     */
+    item = item->next;
+    /* it's a used memory block */
+    item->magic     = RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED;
+    item->pool_ptr  = memheap;
+    item->next      = (struct rt_lwp_memheap_item *)start_addr;
+    item->prev      = (struct rt_lwp_memheap_item *)start_addr;
+    /* not in free list */
+    item->next_free = item->prev_free = RT_NULL;
+
+    /* initialize semaphore lock */
+    rt_sem_init(&(memheap->lock), name, 1, RT_IPC_FLAG_FIFO);
+
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                 ("memory heap: start addr 0x%08x, size %d, free list header 0x%08x\n",
+                  start_addr, size, &(memheap->free_header)));
+
+    return RT_EOK;
+}
+
+void *rt_lwp_memheap_alloc(struct rt_lwp_memheap *heap, rt_uint32_t size)
+{
+    rt_err_t result;
+    rt_uint32_t free_size;
+    struct rt_lwp_memheap_item *header_ptr;
+
+    RT_ASSERT(heap != RT_NULL);
+
+    /* align allocated size */
+    size = RT_ALIGN(size, RT_ALIGN_SIZE);
+    if (size < RT_MEMHEAP_MINIALLOC)
+        size = RT_MEMHEAP_MINIALLOC;
+
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("allocate %d on heap:%8.*s",
+                                    size, RT_NAME_MAX, heap->parent.name));
+
+    if (size < heap->available_size)
+    {
+        /* search on free list */
+        free_size = 0;
+
+        /* lock memheap */
+        result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+        if (result != RT_EOK)
+        {
+            rt_set_errno(result);
+
+            return RT_NULL;
+        }
+
+        /* get the first free memory block */
+        header_ptr = heap->free_list->next_free;
+        while (header_ptr != heap->free_list && free_size < size)
+        {
+            /* get current freed memory block size */
+            free_size = MEMITEM_SIZE(header_ptr);
+            if (free_size < size)
+            {
+                /* move to next free memory block */
+                header_ptr = header_ptr->next_free;
+            }
+        }
+
+        /* determine if the memory is available. */
+        if (free_size >= size)
+        {
+            /* a block that satisfies the request has been found. */
+
+            /* determine if the block needs to be split. */
+            if (free_size >= (size + RT_MEMHEAP_SIZE + RT_MEMHEAP_MINIALLOC))
+            {
+                struct rt_lwp_memheap_item *new_ptr;
+
+                /* split the block. */
+                new_ptr = (struct rt_lwp_memheap_item *)
+                          (((rt_uint8_t *)header_ptr) + size + RT_MEMHEAP_SIZE);
+
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                             ("split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]\n",
+                              header_ptr,
+                              header_ptr->next,
+                              header_ptr->prev,
+                              new_ptr));
+
+                /* mark the new block as a memory block and freed. */
+                new_ptr->magic = RT_MEMHEAP_MAGIC;
+
+                /* put the pool pointer into the new block. */
+                new_ptr->pool_ptr = heap;
+
+                /* break down the block list */
+                new_ptr->prev          = header_ptr;
+                new_ptr->next          = header_ptr->next;
+                header_ptr->next->prev = new_ptr;
+                header_ptr->next       = new_ptr;
+
+                /* remove header ptr from free list */
+                header_ptr->next_free->prev_free = header_ptr->prev_free;
+                header_ptr->prev_free->next_free = header_ptr->next_free;
+                header_ptr->next_free = RT_NULL;
+                header_ptr->prev_free = RT_NULL;
+
+                /* insert new_ptr to free list */
+                new_ptr->next_free = heap->free_list->next_free;
+                new_ptr->prev_free = heap->free_list;
+                heap->free_list->next_free->prev_free = new_ptr;
+                heap->free_list->next_free            = new_ptr;
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("new ptr: next_free 0x%08x, prev_free 0x%08x\n",
+                                                new_ptr->next_free,
+                                                new_ptr->prev_free));
+
+                /* decrement the available byte count.  */
+                heap->available_size = heap->available_size -
+                                       size -
+                                       RT_MEMHEAP_SIZE;
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+            }
+            else
+            {
+                /* decrement the entire free size from the available bytes count. */
+                heap->available_size = heap->available_size - free_size;
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+
+                /* remove header_ptr from free list */
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                             ("one block: block[0x%08x], next_free 0x%08x, prev_free 0x%08x\n",
+                              header_ptr,
+                              header_ptr->next_free,
+                              header_ptr->prev_free));
+
+                header_ptr->next_free->prev_free = header_ptr->prev_free;
+                header_ptr->prev_free->next_free = header_ptr->next_free;
+                header_ptr->next_free = RT_NULL;
+                header_ptr->prev_free = RT_NULL;
+            }
+
+            /* Mark the allocated block as not available. */
+            header_ptr->magic |= RT_MEMHEAP_USED;
+
+            /* release lock */
+            rt_sem_release(&(heap->lock));
+
+            /* Return a memory address to the caller.  */
+            RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                         ("alloc mem: memory[0x%08x], heap[0x%08x], size: %d\n",
+                          (void *)((rt_uint8_t *)header_ptr + RT_MEMHEAP_SIZE),
+                          header_ptr,
+                          size));
+
+            return (void *)((rt_uint8_t *)header_ptr + RT_MEMHEAP_SIZE);
+        }
+
+        /* release lock */
+        rt_sem_release(&(heap->lock));
+    }
+
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("allocate memory: failed\n"));
+
+    /* Return the completion status.  */
+    return RT_NULL;
+}
+
+void *rt_lwp_memheap_realloc(struct rt_lwp_memheap *heap, void *ptr, rt_size_t newsize)
+{
+    rt_err_t result;
+    rt_size_t oldsize;
+    struct rt_lwp_memheap_item *header_ptr;
+    struct rt_lwp_memheap_item *new_ptr;
+
+    if (newsize == 0)
+    {
+        rt_lwp_memheap_free(ptr);
+
+        return RT_NULL;
+    }
+    /* align allocated size */
+    newsize = RT_ALIGN(newsize, RT_ALIGN_SIZE);
+    if (newsize < RT_MEMHEAP_MINIALLOC)
+        newsize = RT_MEMHEAP_MINIALLOC;
+
+    if (ptr == RT_NULL)
+    {
+        return rt_lwp_memheap_alloc(heap, newsize);
+    }
+
+    /* get memory block header and get the size of memory block */
+    header_ptr = (struct rt_lwp_memheap_item *)
+                 ((rt_uint8_t *)ptr - RT_MEMHEAP_SIZE);
+    oldsize = MEMITEM_SIZE(header_ptr);
+    /* re-allocate memory */
+    if (newsize > oldsize)
+    {
+        void *new_ptr;
+        struct rt_lwp_memheap_item *next_ptr;
+
+        /* lock memheap */
+        result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+        if (result != RT_EOK)
+        {
+            rt_set_errno(result);
+            return RT_NULL;
+        }
+
+        next_ptr = header_ptr->next;
+
+        /* header_ptr should not be the tail */
+        RT_ASSERT(next_ptr > header_ptr);
+
+        /* check whether the following free space is enough to expand */
+        if (!RT_MEMHEAP_IS_USED(next_ptr))
+        {
+            rt_int32_t nextsize;
+
+            nextsize = MEMITEM_SIZE(next_ptr);
+            RT_ASSERT(next_ptr > 0);
+
+            /* Here is the ASCII art of the situation that we can make use of
+             * the next free node without alloc/memcpy, |*| is the control
+             * block:
+             *
+             *      oldsize           free node
+             * |*|-----------|*|----------------------|*|
+             *         newsize          >= minialloc
+             * |*|----------------|*|-----------------|*|
+             */
+            if (nextsize + oldsize > newsize + RT_MEMHEAP_MINIALLOC)
+            {
+                /* decrement the entire free size from the available bytes count. */
+                heap->available_size = heap->available_size - (newsize - oldsize);
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+
+                /* remove next_ptr from free list */
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                             ("remove block: block[0x%08x], next_free 0x%08x, prev_free 0x%08x",
+                              next_ptr,
+                              next_ptr->next_free,
+                              next_ptr->prev_free));
+
+                next_ptr->next_free->prev_free = next_ptr->prev_free;
+                next_ptr->prev_free->next_free = next_ptr->next_free;
+                next_ptr->next->prev = next_ptr->prev;
+                next_ptr->prev->next = next_ptr->next;
+
+                /* build a new one on the right place */
+                next_ptr = (struct rt_lwp_memheap_item *)((char *)ptr + newsize);
+
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                             ("new free block: block[0x%08x] nextm[0x%08x] prevm[0x%08x]",
+                              next_ptr,
+                              next_ptr->next,
+                              next_ptr->prev));
+
+                /* mark the new block as a memory block and freed. */
+                next_ptr->magic = RT_MEMHEAP_MAGIC;
+
+                /* put the pool pointer into the new block. */
+                next_ptr->pool_ptr = heap;
+
+                next_ptr->prev          = header_ptr;
+                next_ptr->next          = header_ptr->next;
+                header_ptr->next->prev = next_ptr;
+                header_ptr->next       = next_ptr;
+
+                /* insert next_ptr to free list */
+                next_ptr->next_free = heap->free_list->next_free;
+                next_ptr->prev_free = heap->free_list;
+                heap->free_list->next_free->prev_free = next_ptr;
+                heap->free_list->next_free            = next_ptr;
+                RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("new ptr: next_free 0x%08x, prev_free 0x%08x",
+                                                next_ptr->next_free,
+                                                next_ptr->prev_free));
+
+                /* release lock */
+                rt_sem_release(&(heap->lock));
+
+                return ptr;
+            }
+        }
+
+        /* release lock */
+        rt_sem_release(&(heap->lock));
+
+        /* re-allocate a memory block */
+        new_ptr = (void *)rt_lwp_memheap_alloc(heap, newsize);
+        if (new_ptr != RT_NULL)
+        {
+            rt_memcpy(new_ptr, ptr, oldsize < newsize ? oldsize : newsize);
+            rt_lwp_memheap_free(ptr);
+        }
+
+        return new_ptr;
+    }
+
+    /* don't split when there is less than one node space left */
+    if (newsize + RT_MEMHEAP_SIZE + RT_MEMHEAP_MINIALLOC >= oldsize)
+        return ptr;
+
+    /* lock memheap */
+    result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+    if (result != RT_EOK)
+    {
+        rt_set_errno(result);
+
+        return RT_NULL;
+    }
+
+    /* split the block. */
+    new_ptr = (struct rt_lwp_memheap_item *)
+              (((rt_uint8_t *)header_ptr) + newsize + RT_MEMHEAP_SIZE);
+
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                 ("split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]\n",
+                  header_ptr,
+                  header_ptr->next,
+                  header_ptr->prev,
+                  new_ptr));
+
+    /* mark the new block as a memory block and freed. */
+    new_ptr->magic = RT_MEMHEAP_MAGIC;
+    /* put the pool pointer into the new block. */
+    new_ptr->pool_ptr = heap;
+
+    /* break down the block list */
+    new_ptr->prev          = header_ptr;
+    new_ptr->next          = header_ptr->next;
+    header_ptr->next->prev = new_ptr;
+    header_ptr->next       = new_ptr;
+
+    /* determine if the block can be merged with the next neighbor. */
+    if (!RT_MEMHEAP_IS_USED(new_ptr->next))
+    {
+        struct rt_lwp_memheap_item *free_ptr;
+
+        /* merge block with next neighbor. */
+        free_ptr = new_ptr->next;
+        heap->available_size = heap->available_size - MEMITEM_SIZE(free_ptr);
+
+        RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                     ("merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x\n",
+                      header_ptr, header_ptr->next_free, header_ptr->prev_free));
+
+        free_ptr->next->prev = new_ptr;
+        new_ptr->next   = free_ptr->next;
+
+        /* remove free ptr from free list */
+        free_ptr->next_free->prev_free = free_ptr->prev_free;
+        free_ptr->prev_free->next_free = free_ptr->next_free;
+    }
+
+    /* insert the split block to free list */
+    new_ptr->next_free = heap->free_list->next_free;
+    new_ptr->prev_free = heap->free_list;
+    heap->free_list->next_free->prev_free = new_ptr;
+    heap->free_list->next_free            = new_ptr;
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("new free ptr: next_free 0x%08x, prev_free 0x%08x\n",
+                                    new_ptr->next_free,
+                                    new_ptr->prev_free));
+
+    /* increment the available byte count.  */
+    heap->available_size = heap->available_size + MEMITEM_SIZE(new_ptr);
+
+    /* release lock */
+    rt_sem_release(&(heap->lock));
+
+    /* return the old memory block */
+    return ptr;
+}
+
+void rt_lwp_memheap_free(void *ptr)
+{
+    rt_err_t result;
+    struct rt_lwp_memheap *heap;
+    struct rt_lwp_memheap_item *header_ptr, *new_ptr;
+    rt_uint32_t insert_header;
+
+    /* NULL check */
+    if (ptr == RT_NULL) return;
+
+    /* set initial status as OK */
+    insert_header = 1;
+    new_ptr       = RT_NULL;
+    header_ptr    = (struct rt_lwp_memheap_item *)
+                    ((rt_uint8_t *)ptr - RT_MEMHEAP_SIZE);
+
+    RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("free memory: memory[0x%08x], block[0x%08x]\n",
+                                    ptr, header_ptr));
+
+    /* check magic */
+    RT_ASSERT((header_ptr->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
+    RT_ASSERT(header_ptr->magic & RT_MEMHEAP_USED);
+    /* check whether this block of memory has been over-written. */
+    RT_ASSERT((header_ptr->next->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
+
+    /* get pool ptr */
+    heap = header_ptr->pool_ptr;
+
+    /* lock memheap */
+    result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+    if (result != RT_EOK)
+    {
+        rt_set_errno(result);
+
+        return ;
+    }
+
+    /* Mark the memory as available. */
+    header_ptr->magic &= ~RT_MEMHEAP_USED;
+    /* Adjust the available number of bytes. */
+    heap->available_size = heap->available_size + MEMITEM_SIZE(header_ptr);
+
+    /* Determine if the block can be merged with the previous neighbor. */
+    if (!RT_MEMHEAP_IS_USED(header_ptr->prev))
+    {
+        RT_DEBUG_LOG(RT_DEBUG_MEMHEAP, ("merge: left node 0x%08x\n",
+                                        header_ptr->prev));
+
+        /* adjust the available number of bytes. */
+        heap->available_size = heap->available_size + RT_MEMHEAP_SIZE;
+
+        /* yes, merge block with previous neighbor. */
+        (header_ptr->prev)->next = header_ptr->next;
+        (header_ptr->next)->prev = header_ptr->prev;
+
+        /* move header pointer to previous. */
+        header_ptr = header_ptr->prev;
+        /* don't insert header to free list */
+        insert_header = 0;
+    }
+
+    /* determine if the block can be merged with the next neighbor. */
+    if (!RT_MEMHEAP_IS_USED(header_ptr->next))
+    {
+        /* adjust the available number of bytes. */
+        heap->available_size = heap->available_size + RT_MEMHEAP_SIZE;
+
+        /* merge block with next neighbor. */
+        new_ptr = header_ptr->next;
+
+        RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                     ("merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x\n",
+                      new_ptr, new_ptr->next_free, new_ptr->prev_free));
+
+        new_ptr->next->prev = header_ptr;
+        header_ptr->next    = new_ptr->next;
+
+        /* remove new ptr from free list */
+        new_ptr->next_free->prev_free = new_ptr->prev_free;
+        new_ptr->prev_free->next_free = new_ptr->next_free;
+    }
+
+    if (insert_header)
+    {
+        /* no left merge, insert to free list */
+        header_ptr->next_free = heap->free_list->next_free;
+        header_ptr->prev_free = heap->free_list;
+        heap->free_list->next_free->prev_free = header_ptr;
+        heap->free_list->next_free            = header_ptr;
+
+        RT_DEBUG_LOG(RT_DEBUG_MEMHEAP,
+                     ("insert to free list: next_free 0x%08x, prev_free 0x%08x\n",
+                      header_ptr->next_free, header_ptr->prev_free));
+    }
+
+    /* release lock */
+    rt_sem_release(&(heap->lock));
+}
+
+rt_bool_t rt_lwp_memheap_is_empty(struct rt_lwp_memheap *memheap)
+{
+    RT_ASSERT(memheap != RT_NULL);
+
+    return (memheap->available_size + 2 * sizeof(struct rt_lwp_memheap_item)) == memheap->pool_size;
+}
+
+rt_bool_t rt_lwp_memheap_unavailable_size_get(void)
+{
+    return 2 * RT_MEMHEAP_SIZE + 3;
+}
diff --git a/components/lwp/lwp_memheap.h b/components/lwp/lwp_memheap.h
new file mode 100644
index 0000000000..064238585c
--- /dev/null
+++ b/components/lwp/lwp_memheap.h
@@ -0,0 +1,74 @@
+/*
+ * File      : lwp_memheap.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#ifndef __LWP_MEMHEAP_H__
+#define __LWP_MEMHEAP_H__
+
+#include <stdint.h>
+#include <rtthread.h>
+
+/**
+ * memory item on the heap
+ */
+struct rt_lwp_memheap_item
+{
+    rt_uint32_t                 magic;                  /**< magic number for memheap */
+    struct rt_lwp_memheap      *pool_ptr;               /**< point of pool */
+
+    struct rt_lwp_memheap_item *next;                   /**< next memheap item */
+    struct rt_lwp_memheap_item *prev;                   /**< prev memheap item */
+
+    struct rt_lwp_memheap_item *next_free;              /**< next free memheap item */
+    struct rt_lwp_memheap_item *prev_free;              /**< prev free memheap item */
+};
+
+/**
+ * Base structure of memory heap object
+ */
+struct rt_lwp_memheap
+{
+    struct rt_object        parent;                     /**< inherit from rt_object */
+
+    void                   *start_addr;                 /**< pool start address and size */
+
+    rt_uint32_t             pool_size;                  /**< pool size */
+    rt_uint32_t             available_size;             /**< available size */
+    rt_uint32_t             max_used_size;              /**< maximum allocated size */
+
+    struct rt_lwp_memheap_item *block_list;             /**< used block list */
+    struct rt_lwp_memheap_item *free_list;              /**< free block list */
+    struct rt_lwp_memheap_item  free_header;            /**< free block list header */
+
+    struct rt_semaphore     lock;                       /**< semaphore lock */
+
+    rt_list_t mlist;
+};
+
+extern rt_err_t rt_lwp_memheap_init(struct rt_lwp_memheap *memheap, const char *name, void *start_addr, rt_uint32_t size);
+extern void *rt_lwp_memheap_alloc(struct rt_lwp_memheap *heap, rt_uint32_t size);
+extern void rt_lwp_memheap_free(void *ptr);
+extern void *rt_lwp_memheap_realloc(struct rt_lwp_memheap *heap, void *ptr, rt_size_t newsize);
+extern rt_bool_t rt_lwp_memheap_is_empty(struct rt_lwp_memheap *memheap);
+extern rt_bool_t rt_lwp_memheap_unavailable_size_get(void);
+
+#endif
diff --git a/components/lwp/lwp_syscall.c b/components/lwp/lwp_syscall.c
new file mode 100644
index 0000000000..be5e15dcb3
--- /dev/null
+++ b/components/lwp/lwp_syscall.c
@@ -0,0 +1,242 @@
+/*
+ * File      : lwp_syscall.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+/* RT-Thread System call */
+#include <lwp.h>
+#include <lwp_mem.h>
+#include <lwp_syscall.h>
+
+#define DBG_ENABLE
+#define DBG_SECTION_NAME    "[LWP_CALL]"
+#define DBG_COLOR
+#define DBG_LEVEL           DBG_WARNING
+#include <rtdbg.h>
+
+/* thread/process */
+void sys_exit(int value)
+{
+    /* TODO: handle the return_value */
+
+    dbg_log(DBG_LOG, "enter sys_exit\n");
+
+    rt_thread_delete(rt_thread_self());
+
+    rt_schedule();
+
+    return;
+}
+
+/* syscall: "read" ret: "ssize_t" args: "int" "void *" "size_t" */
+ssize_t sys_read(int fd, void *buf, size_t nbyte)
+{
+    return read(fd, buf, nbyte);
+}
+
+/* syscall: "write" ret: "ssize_t" args: "int" "const void *" "size_t" */
+ssize_t sys_write(int fd, const void *buf, size_t nbyte)
+{
+    return write(fd, buf, nbyte);
+}
+
+/* syscall: "lseek" ret: "off_t" args: "int" "off_t" "int" */
+off_t sys_lseek(int fd, off_t offset, int whence)
+{
+    return lseek(fd, offset, whence);
+}
+
+/* syscall: "open" ret: "int" args: "const char *" "int" "..." */
+int sys_open(const char *name, int mode, ...)
+{
+    return open(name, mode, 0);
+}
+
+/* syscall: "close" ret: "int" args: "int" */
+int sys_close(int fd)
+{
+    return close(fd);
+}
+
+/* syscall: "ioctl" ret: "int" args: "int" "u_long" "..." */
+int sys_ioctl(int fd, unsigned long cmd, void* data)
+{
+    return ioctl(fd, cmd, data);
+}
+
+/* syscall: "nanosleep" ret: "int" args: "const struct timespec *" "struct timespec *" */
+int sys_nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
+{
+    rt_tick_t tick;
+
+    dbg_log(DBG_LOG, "sys_nanosleep\n");
+
+    tick = rqtp->tv_sec * RT_TICK_PER_SECOND + (rqtp->tv_nsec * RT_TICK_PER_SECOND)/ 1000000000;
+    rt_thread_delay(tick);
+
+    if (rmtp)
+    {
+        tick = rt_tick_get() - tick;
+        /* get the passed time */
+        rmtp->tv_sec = tick/RT_TICK_PER_SECOND;
+        rmtp->tv_nsec = (tick%RT_TICK_PER_SECOND) * (1000000000/RT_TICK_PER_SECOND);
+    }
+
+    return 0;
+}
+
+/* syscall: "getpriority" ret: "int" args: "int" "id_t" */
+int sys_getpriority(int which, id_t who)
+{
+    if (which == PRIO_PROCESS)
+    {
+        rt_thread_t tid;
+
+        tid = rt_thread_self();
+        if (who == (id_t)tid || who == 0xff)
+        {
+            return tid->current_priority;
+        }
+    }
+
+    return 0xff;
+}
+
+/* syscall: "setpriority" ret: "int" args: "int" "id_t" "int" */
+int sys_setpriority(int which, id_t who, int prio)
+{
+    if (which == PRIO_PROCESS)
+    {
+        rt_thread_t tid;
+
+        tid = rt_thread_self();
+        if ((who == (id_t)tid || who == 0xff) && (prio >= 0 && prio < RT_THREAD_PRIORITY_MAX))
+        {
+            rt_thread_control(tid, RT_THREAD_CTRL_CHANGE_PRIORITY, &prio);
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+/* syscall: "gettimeofday" ret: "int" args: "struct timeval *" "struct timezone *" */
+int sys_gettimeofday(struct timeval *tp, struct timezone *tzp)
+{
+    if (tp)
+    {
+        tp->tv_sec = rt_tick_get() / RT_TICK_PER_SECOND;
+        tp->tv_usec = (rt_tick_get() % RT_TICK_PER_SECOND) * (1000000 / RT_TICK_PER_SECOND);
+    }
+
+    return 0;
+}
+
+/* syscall: "settimeofday" ret: "int" args: "const struct timeval *" "const struct timezone *" */
+int sys_settimeofday(const struct timeval *tv, const struct timezone *tzp)
+{
+    return 0;
+}
+
+/* syscall: "msgget" ret: "int" args: "key_t" "int" */
+int sys_msgget(key_t key, int msgflg)
+{
+    return -1;
+}
+
+/* syscall: "msgsnd" ret: "int" args: "int" "const void *" "size_t" "int" */
+int sys_msgsend(int msqid, const void *msgp, size_t msgsz, int msgflg)
+{
+    return -1;
+}
+
+/* syscall: "msgrcv" ret: "int" args: "int" "void *" "size_t" "long" "int" */
+int sys_msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
+{
+    return -1;
+}
+
+/* syscall: "sys_log" ret: "int" args: "const char*" "size" */
+int sys_log(const char* log, int size)
+{
+    rt_device_t console = rt_console_get_device();
+
+    if (console) rt_device_write(console, -1, log, size);
+
+    return 0;
+}
+
+void *sys_malloc(size_t size)
+{
+    return rt_lwp_mem_malloc(size);
+}
+
+void sys_free(void *addr)
+{
+    rt_lwp_mem_free(addr);
+}
+
+void *sys_realloc(void *rmem, size_t newsize)
+{
+    return rt_lwp_mem_realloc(rmem, newsize);
+}
+
+const static void* func_table[] =
+{
+    (void *)sys_exit,           // 0x01
+    (void *)sys_read,           // 0x02
+    (void *)sys_write,          // 0x03
+    (void *)sys_lseek,          // 0x04
+    (void *)sys_open,           // 0x05
+    (void *)sys_close,          // 0x06
+    (void *)sys_ioctl,          // 0x07
+
+    (void *)sys_nanosleep,      // 0x08
+
+    (void *)sys_getpriority,    // 0x09
+    (void *)sys_setpriority,    // 0x0a
+
+    (void *)sys_gettimeofday,   // 0x0b
+    (void *)sys_settimeofday,   // 0x0c
+        
+    (void *)sys_malloc,         // 0x0d
+    (void *)sys_free,           // 0x0e
+};
+
+const void *lwp_get_sys_api(rt_uint32_t number)
+{
+    const void *func = RT_NULL;
+
+    if (number == 0xff)
+    {
+        func = (void *)sys_log;
+    }
+    else
+    {
+        number -= 1;
+        if (number < sizeof(func_table)/sizeof(func_table[0]))
+        {
+            func = func_table[number];
+        }
+    }
+
+    return func;
+}
diff --git a/components/lwp/lwp_syscall.h b/components/lwp/lwp_syscall.h
new file mode 100644
index 0000000000..eba25c40e3
--- /dev/null
+++ b/components/lwp/lwp_syscall.h
@@ -0,0 +1,78 @@
+/*
+ * File      : lwp_syscall.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-18     Bernard      the first version
+ * 2006-04-25     Bernard      add rt_hw_context_switch_interrupt declaration
+ * 2006-09-24     Bernard      add rt_hw_context_switch_to declaration
+ * 2012-12-29     Bernard      add rt_hw_exception_install declaration
+ * 2017-10-17     Hichard      add some micros
+ */
+
+#ifndef __LWP_SYSCALL_H__
+#define __LWP_SYSCALL_H__
+
+#include <stdint.h>
+#include <rtthread.h>
+#include <dfs_posix.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+typedef long suseconds_t;       /* microseconds (signed) */
+typedef long key_t;             /* IPC key (for Sys V IPC) */
+typedef uint32_t id_t;          /* may contain pid, uid or gid */
+
+/*
+ * Process priority specifications to get/setpriority.
+ */
+#define	PRIO_MIN	    (-20)
+#define	PRIO_MAX	    20
+
+#define	PRIO_PROCESS	0       /* only support lwp process */
+#define	PRIO_PGRP	    1
+#define	PRIO_USER	    2
+
+#define TIMEVAL_TO_TIMESPEC(tv, ts) {                   \
+    (ts)->tv_sec = (tv)->tv_sec;                        \
+    (ts)->tv_nsec = (tv)->tv_usec * 1000;               \
+}
+#define TIMESPEC_TO_TIMEVAL(tv, ts) {                   \
+    (tv)->tv_sec = (ts)->tv_sec;                        \
+    (tv)->tv_usec = (ts)->tv_nsec / 1000;               \
+}
+
+void sys_exit(int value);
+ssize_t sys_read(int fd, void *buf, size_t nbyte);
+ssize_t sys_write(int fd, const void *buf, size_t nbyte);
+off_t sys_lseek(int fd, off_t offset, int whence);
+int sys_open(const char *name, int mode, ...);
+int sys_close(int fd);
+int sys_nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
+int sys_getpriority(int which, id_t who);
+int sys_setpriority(int which, id_t who, int prio);
+int sys_gettimeofday(struct timeval *tp, struct timezone *tzp);
+int sys_settimeofday(const struct timeval *tv, const struct timezone *tzp);
+int sys_msgget(key_t key, int msgflg);
+int sys_msgsend(int msqid, const void *msgp, size_t msgsz, int msgflg);
+int sys_msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg);
+
+int sys_log(const char* log, int size);
+
+#endif