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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-11-18 Jesven first version
* 2021-02-03 lizhirui port to riscv64
* 2021-02-06 lizhirui add thread filter
* 2021-02-19 lizhirui port to new version of rt-smart
* 2021-03-02 lizhirui add a auxillary function for interrupt
* 2021-03-04 lizhirui delete thread filter
* 2021-03-04 lizhirui modify for new version of rt-smart
* 2021-11-22 JasonHu add lwp_set_thread_context
* 2021-11-30 JasonHu add clone/fork support
*/
#include <rthw.h>
#include <rtthread.h>
#include <stddef.h>
#ifdef ARCH_MM_MMU
#include <lwp.h>
#include <lwp_arch.h>
#include <lwp_user_mm.h>
#include <page.h>
#include <cpuport.h>
#include <encoding.h>
#include <stack.h>
extern rt_ubase_t MMUTable[];
void *lwp_copy_return_code_to_user_stack()
{
void lwp_thread_return();
void lwp_thread_return_end();
rt_thread_t tid = rt_thread_self();
if (tid->user_stack != RT_NULL)
{
rt_size_t size = (rt_size_t)lwp_thread_return_end - (rt_size_t)lwp_thread_return;
rt_size_t userstack = (rt_size_t)tid->user_stack + tid->user_stack_size - size;
rt_memcpy((void *)userstack, lwp_thread_return, size);
return (void *)userstack;
}
return RT_NULL;
}
rt_ubase_t lwp_fix_sp(rt_ubase_t cursp)
{
void lwp_thread_return();
void lwp_thread_return_end();
if (cursp == 0)
{
return 0;
}
return cursp - ((rt_size_t)lwp_thread_return_end - (rt_size_t)lwp_thread_return);
}
rt_thread_t rt_thread_sp_to_thread(void *spmember_addr)
{
return (rt_thread_t)(((rt_ubase_t)spmember_addr) - (offsetof(struct rt_thread, sp)));
}
void *get_thread_kernel_stack_top(rt_thread_t thread)
{
return (void *)(((rt_size_t)thread->stack_addr) + ((rt_size_t)thread->stack_size));
}
void *arch_get_user_sp(void)
{
/* user sp saved in interrupt context */
rt_thread_t self = rt_thread_self();
rt_uint8_t *stack_top = (rt_uint8_t *)self->stack_addr + self->stack_size;
struct rt_hw_stack_frame *frame = (struct rt_hw_stack_frame *)(stack_top - sizeof(struct rt_hw_stack_frame));
return (void *)frame->user_sp_exc_stack;
}
int arch_user_space_init(struct rt_lwp *lwp)
{
rt_ubase_t *mmu_table;
mmu_table = (rt_ubase_t *)rt_pages_alloc(0);
if (!mmu_table)
{
return -1;
}
lwp->end_heap = USER_HEAP_VADDR;
rt_memcpy(mmu_table, MMUTable, ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_table, ARCH_PAGE_SIZE);
lwp->aspace = rt_aspace_create(
(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, mmu_table);
if (!lwp->aspace)
{
return -1;
}
return 0;
}
void *arch_kernel_mmu_table_get(void)
{
return (void *)((char *)MMUTable);
}
void arch_user_space_vtable_free(struct rt_lwp *lwp)
{
if (lwp && lwp->aspace->page_table)
{
rt_pages_free(lwp->aspace->page_table, 0);
lwp->aspace->page_table = NULL;
}
}
long _sys_clone(void *arg[]);
long sys_clone(void *arg[])
{
return _sys_clone(arg);
}
long _sys_fork(void);
long sys_fork(void)
{
return _sys_fork();
}
long _sys_vfork(void);
long sys_vfork(void)
{
return _sys_fork();
}
/**
* set exec context for fork/clone.
*/
int arch_set_thread_context(void (*exit)(void), void *new_thread_stack,
void *user_stack, void **thread_sp)
{
RT_ASSERT(exit != RT_NULL);
RT_ASSERT(user_stack != RT_NULL);
RT_ASSERT(new_thread_stack != RT_NULL);
RT_ASSERT(thread_sp != RT_NULL);
struct rt_hw_stack_frame *syscall_frame;
struct rt_hw_stack_frame *thread_frame;
rt_uint8_t *stk;
rt_uint8_t *syscall_stk;
stk = (rt_uint8_t *)new_thread_stack;
/* reserve syscall context, all the registers are copyed from parent */
stk -= CTX_REG_NR * REGBYTES;
syscall_stk = stk;
syscall_frame = (struct rt_hw_stack_frame *)stk;
/* modify user sp */
syscall_frame->user_sp_exc_stack = (rt_ubase_t)user_stack;
/* skip ecall */
syscall_frame->epc += 4;
/* child return value is 0 */
syscall_frame->a0 = 0;
syscall_frame->a1 = 0;
/* reset thread area */
rt_thread_t thread = rt_container_of((unsigned long)thread_sp, struct rt_thread, sp);
syscall_frame->tp = (rt_ubase_t)thread->thread_idr;
#ifdef ARCH_USING_NEW_CTX_SWITCH
extern void *_rt_hw_stack_init(rt_ubase_t *sp, rt_ubase_t ra, rt_ubase_t sstatus);
rt_ubase_t sstatus = read_csr(sstatus) | SSTATUS_SPP;
sstatus &= ~SSTATUS_SIE;
/* compatible to RESTORE_CONTEXT */
stk = (void *)_rt_hw_stack_init((rt_ubase_t *)stk, (rt_ubase_t)exit, sstatus);
#else
/* build temp thread context */
stk -= sizeof(struct rt_hw_stack_frame);
thread_frame = (struct rt_hw_stack_frame *)stk;
int i;
for (i = 0; i < sizeof(struct rt_hw_stack_frame) / sizeof(rt_ubase_t); i++)
{
((rt_ubase_t *)thread_frame)[i] = 0xdeadbeaf;
}
/* set pc for thread */
thread_frame->epc = (rt_ubase_t)exit;
/* set old exception mode as supervisor, because in kernel */
thread_frame->sstatus = read_csr(sstatus) | SSTATUS_SPP;
thread_frame->sstatus &= ~SSTATUS_SIE; /* must disable interrupt */
/* set stack as syscall stack */
thread_frame->user_sp_exc_stack = (rt_ubase_t)syscall_stk;
#endif /* ARCH_USING_NEW_CTX_SWITCH */
/* save new stack top */
*thread_sp = (void *)stk;
/**
* The stack for child thread:
*
* +------------------------+ --> kernel stack top
* | syscall stack |
* | |
* | @sp | --> `user_stack`
* | @epc | --> user ecall addr + 4 (skip ecall)
* | @a0&a1 | --> 0 (for child return 0)
* | |
* +------------------------+ --> temp thread stack top
* | temp thread stack | ^
* | | |
* | @sp | ---------/
* | @epc | --> `exit` (arch_clone_exit/arch_fork_exit)
* | |
* +------------------------+ --> thread sp
*/
}
/**
* void lwp_exec_user(void *args, void *kernel_stack, void *user_entry)
*/
void lwp_exec_user(void *args, void *kernel_stack, void *user_entry)
{
arch_start_umode(args, user_entry, (void *)USER_STACK_VEND, kernel_stack);
}
void *arch_get_usp_from_uctx(struct rt_user_context *uctx)
{
return uctx->sp;
}
#endif /* ARCH_MM_MMU */
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