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Diffstat (limited to 'libcpu/arm/cortex-m3/stack.c')
| -rw-r--r-- | libcpu/arm/cortex-m3/stack.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libcpu/arm/cortex-m3/stack.c b/libcpu/arm/cortex-m3/stack.c new file mode 100644 index 0000000000..23a419f33f --- /dev/null +++ b/libcpu/arm/cortex-m3/stack.c @@ -0,0 +1,72 @@ +/******************************************************************//** + * @file stack.c + * @brief This file is part of RT-Thread RTOS + * COPYRIGHT (C) 2009, RT-Thread Development Team + * @author Bernard, onelife + * @version 0.4 beta + ********************************************************************** + * @section License + * 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 + ********************************************************************** + * @section Change Logs + * Date Author Notes + * 2006-08-23 Bernard first version + * 2011-02-14 onelife Modify for EFM32 + *********************************************************************/ + +/******************************************************************//** +* @addtogroup cortex-m3 +* @{ +*********************************************************************/ + +/* Includes -------------------------------------------------------------------*/ +#include <rtthread.h> + +/* Private typedef -------------------------------------------------------------*/ +/* Private define --------------------------------------------------------------*/ +/* Private macro --------------------------------------------------------------*/ +/* Private variables ------------------------------------------------------------*/ +/* Private function prototypes ---------------------------------------------------*/ +/* Private functions ------------------------------------------------------------*/ +/** + * 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) +{ + unsigned long *stk; + + stk = (unsigned long *)stack_addr; + *(stk) = 0x01000000L; /* PSR */ + *(--stk) = (unsigned long)tentry; /* entry point, pc */ + *(--stk) = (unsigned long)texit; /* lr */ + *(--stk) = 0; /* r12 */ + *(--stk) = 0; /* r3 */ + *(--stk) = 0; /* r2 */ + *(--stk) = 0; /* r1 */ + *(--stk) = (unsigned long)parameter; /* r0 : argument */ + + *(--stk) = 0; /* r11 */ + *(--stk) = 0; /* r10 */ + *(--stk) = 0; /* r9 */ + *(--stk) = 0; /* r8 */ + *(--stk) = 0; /* r7 */ + *(--stk) = 0; /* r6 */ + *(--stk) = 0; /* r5 */ + *(--stk) = 0; /* r4 */ + + /* return task's current stack address */ + return (rt_uint8_t *)stk; +} + +/******************************************************************//** + * @} +*********************************************************************/ |