rt-thread/libcpu/arm/cortex-m0/cpuport.c

/*
 * File      : cpu.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
 * 2010-01-25     Bernard      first version
 * 2012-05-31     aozima       Merge all of the C source code into cpuport.c
 */

#include <rtthread.h>

struct stack_contex
{
    rt_uint32_t r0;
    rt_uint32_t r1;
    rt_uint32_t r2;
    rt_uint32_t r3;
    rt_uint32_t r12;
    rt_uint32_t lr;
    rt_uint32_t pc;
    rt_uint32_t psr;
};

/* flag in interrupt handling */
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;

/**
 * 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;							/* r7 */
    *(--stk) = 0;							/* r6 */
    *(--stk) = 0;							/* r5 */
    *(--stk) = 0;							/* r4 */

    /* return task's current stack address */
    return (rt_uint8_t *)stk;
}

extern long list_thread(void);
extern rt_thread_t rt_current_thread;
void rt_hw_hard_fault_exception(struct stack_contex* contex)
{
    rt_kprintf("psr: 0x%08x\n", contex->psr);
    rt_kprintf(" pc: 0x%08x\n", contex->pc);
    rt_kprintf(" lr: 0x%08x\n", contex->lr);
    rt_kprintf("r12: 0x%08x\n", contex->r12);
    rt_kprintf("r03: 0x%08x\n", contex->r3);
    rt_kprintf("r02: 0x%08x\n", contex->r2);
    rt_kprintf("r01: 0x%08x\n", contex->r1);
    rt_kprintf("r00: 0x%08x\n", contex->r0);

    rt_kprintf("hard fault on thread: %s\n", rt_current_thread->name);
#ifdef RT_USING_FINSH
    list_thread();
#endif
    while (1);
}