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/*
* File : cpuport.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, 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
* 2011-10-21 Bernard the first version.
* 2011-10-27 aozima update for cortex-M4 FPU.
* 2011-12-31 aozima fixed stack align issues.
* 2012-01-01 aozima support context switch load/store FPU register.
* 2012-12-11 lgnq fixed the coding style.
* 2012-12-23 aozima stack addr align to 8byte.
* 2012-12-29 Bernard Add exception hook.
* 2013-06-23 aozima support lazy stack optimized.
*/
#include <rtthread.h>
#define USE_FPU /* ARMCC */ ( (defined ( __CC_ARM ) && defined ( __TARGET_FPU_VFP )) \
/* IAR */ || (defined ( __ICCARM__ ) && defined ( __ARMVFP__ )) \
/* GNU */ || (defined ( __GNUC__ ) && defined ( __VFP_FP__ ) && !defined(__SOFTFP__)) )
/* exception and interrupt handler table */
rt_uint32_t rt_interrupt_from_thread;
rt_uint32_t rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
/* exception hook */
static rt_err_t (*rt_exception_hook)(void *context) = RT_NULL;
struct exception_stack_frame
{
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;
};
struct stack_frame
{
#if USE_FPU
rt_uint32_t flag;
#endif /* USE_FPU */
/* r4 ~ r11 register */
rt_uint32_t r4;
rt_uint32_t r5;
rt_uint32_t r6;
rt_uint32_t r7;
rt_uint32_t r8;
rt_uint32_t r9;
rt_uint32_t r10;
rt_uint32_t r11;
struct exception_stack_frame exception_stack_frame;
};
struct exception_stack_frame_fpu
{
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;
#if USE_FPU
/* FPU register */
rt_uint32_t S0;
rt_uint32_t S1;
rt_uint32_t S2;
rt_uint32_t S3;
rt_uint32_t S4;
rt_uint32_t S5;
rt_uint32_t S6;
rt_uint32_t S7;
rt_uint32_t S8;
rt_uint32_t S9;
rt_uint32_t S10;
rt_uint32_t S11;
rt_uint32_t S12;
rt_uint32_t S13;
rt_uint32_t S14;
rt_uint32_t S15;
rt_uint32_t FPSCR;
rt_uint32_t NO_NAME;
#endif
};
struct stack_frame_fpu
{
rt_uint32_t flag;
/* r4 ~ r11 register */
rt_uint32_t r4;
rt_uint32_t r5;
rt_uint32_t r6;
rt_uint32_t r7;
rt_uint32_t r8;
rt_uint32_t r9;
rt_uint32_t r10;
rt_uint32_t r11;
#if USE_FPU
/* FPU register s16 ~ s31 */
rt_uint32_t s16;
rt_uint32_t s17;
rt_uint32_t s18;
rt_uint32_t s19;
rt_uint32_t s20;
rt_uint32_t s21;
rt_uint32_t s22;
rt_uint32_t s23;
rt_uint32_t s24;
rt_uint32_t s25;
rt_uint32_t s26;
rt_uint32_t s27;
rt_uint32_t s28;
rt_uint32_t s29;
rt_uint32_t s30;
rt_uint32_t s31;
#endif
struct exception_stack_frame_fpu exception_stack_frame;
};
rt_uint8_t *rt_hw_stack_init(void *tentry,
void *parameter,
rt_uint8_t *stack_addr,
void *texit)
{
struct stack_frame *stack_frame;
rt_uint8_t *stk;
unsigned long i;
stk = stack_addr + sizeof(rt_uint32_t);
stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8);
stk -= sizeof(struct stack_frame);
stack_frame = (struct stack_frame *)stk;
/* init all register */
for (i = 0; i < sizeof(struct stack_frame) / sizeof(rt_uint32_t); i ++)
{
((rt_uint32_t *)stack_frame)[i] = 0xdeadbeef;
}
stack_frame->exception_stack_frame.r0 = (unsigned long)parameter; /* r0 : argument */
stack_frame->exception_stack_frame.r1 = 0; /* r1 */
stack_frame->exception_stack_frame.r2 = 0; /* r2 */
stack_frame->exception_stack_frame.r3 = 0; /* r3 */
stack_frame->exception_stack_frame.r12 = 0; /* r12 */
stack_frame->exception_stack_frame.lr = (unsigned long)texit; /* lr */
stack_frame->exception_stack_frame.pc = (unsigned long)tentry; /* entry point, pc */
stack_frame->exception_stack_frame.psr = 0x01000000L; /* PSR */
#if USE_FPU
stack_frame->flag = 0;
#endif /* USE_FPU */
/* return task's current stack address */
return stk;
}
/**
* This function set the hook, which is invoked on fault exception handling.
*
* @param exception_handle the exception handling hook function.
*/
void rt_hw_exception_install(rt_err_t (*exception_handle)(void* context))
{
rt_exception_hook = exception_handle;
}
void rt_hw_hard_fault_exception(struct exception_stack_frame *exception_stack)
{
extern long list_thread(void);
if (rt_exception_hook != RT_NULL)
{
rt_err_t result;
result = rt_exception_hook(exception_stack);
if (result == RT_EOK) return;
}
rt_kprintf("psr: 0x%08x\n", exception_stack->psr);
rt_kprintf(" pc: 0x%08x\n", exception_stack->pc);
rt_kprintf(" lr: 0x%08x\n", exception_stack->lr);
rt_kprintf("r12: 0x%08x\n", exception_stack->r12);
rt_kprintf("r03: 0x%08x\n", exception_stack->r3);
rt_kprintf("r02: 0x%08x\n", exception_stack->r2);
rt_kprintf("r01: 0x%08x\n", exception_stack->r1);
rt_kprintf("r00: 0x%08x\n", exception_stack->r0);
rt_kprintf("hard fault on thread: %s\n", rt_thread_self()->name);
#ifdef RT_USING_FINSH
list_thread();
#endif
while (1);
}
void rt_hw_cpu_shutdown(void)
{
rt_kprintf("shutdown...\n");
RT_ASSERT(0);
}
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