From 02564df01e8bf28dcdd0f664ce010890d4eb3aa3 Mon Sep 17 00:00:00 2001 From: dzzxzz Date: Wed, 14 Apr 2010 00:21:14 +0000 Subject: port rt-thread to M16C git-svn-id: https://rt-thread.googlecode.com/svn/trunk@619 bbd45198-f89e-11dd-88c7-29a3b14d5316 --- libcpu/m16c/stack.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 libcpu/m16c/stack.c (limited to 'libcpu/m16c/stack.c') diff --git a/libcpu/m16c/stack.c b/libcpu/m16c/stack.c new file mode 100644 index 0000000000..ae6bc8aa40 --- /dev/null +++ b/libcpu/m16c/stack.c @@ -0,0 +1,59 @@ +/* + * File : stack.c + * This file is part of RT-Thread RTOS + * COPYRIGHT (C) 2009, RT-Thread Development Team + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rt-thread.org/license/LICENSE + * + * Change Logs: + * Date Author Notes + * 2010-04-09 fify the first version + * + * For : Renesas M16C + * Toolchain : IAR's EW for M16C v3.401 +*/ + +#include + +/** + * This function will initialize thread stack + * + * @param tentry the entry of thread + * @param parameter the parameter of entry + * @param stack_addr the beginning stack address + * @param texit the function will be called when thread exit + * + * @return stack address + */ +rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, + rt_uint8_t *stack_addr, void *texit) +{ + rt_uint16_t *pstk16; + rt_uint16_t flag; + + + flag = 0x0040; + pstk16 = (rt_uint16_t *)stack_addr; + pstk16--; + + /* Simulate ISR entry */ + *pstk16-- = (flag & 0x00FF) /* ... The lowest byte of the FLAG register */ + | (((rt_uint32_t)tentry >> 8) & 0x00000F00) /* ... The highest nibble of the PC register */ + | ((flag << 4) & 0xF000); /* ... The highest nibble of the FLAG register */ + *pstk16-- = (((rt_uint32_t)tentry ) & 0x0000FFFF); /* ... The lowest bytes of the PC register */ + + /* Save registers onto stack frame */ + *pstk16-- = (rt_uint16_t)0xFBFB; /* ... FB register */ + *pstk16-- = (rt_uint16_t)0x3B3B; /* ... SB register */ + *pstk16-- = (rt_uint16_t)0xA1A1; /* ... A1 register */ + *pstk16-- = (rt_uint16_t)0xA0A0; /* ... A0 register */ + *pstk16-- = (rt_uint16_t)0x3333; /* ... R3 register */ + *pstk16-- = (rt_uint32_t)parameter >> 16L; /* ... Pass argument in R2 register */ + *pstk16-- = (rt_uint32_t)parameter & 0x0000FFFFL; /* ... Pass argument in R1 register */ + *pstk16 = (rt_uint16_t)0x0000; /* ... R0 register */ + + /* return task's current stack address */ + return (rt_uint8_t *)pstk16; +} -- cgit v1.3.1