191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/*
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* File : cpuport.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2009-01-05 Bernard first version
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* 2011-02-14 onelife Modify for EFM32
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* 2011-06-17 onelife Merge all of the C source code into cpuport.c
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* 2012-12-23 aozima stack addr align to 8byte.
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* 2012-12-29 Bernard Add exception hook.
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*/
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#include <rtthread.h>
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struct exception_stack_frame
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{
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rt_uint32_t r0;
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rt_uint32_t r1;
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rt_uint32_t r2;
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rt_uint32_t r3;
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rt_uint32_t r12;
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rt_uint32_t lr;
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rt_uint32_t pc;
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rt_uint32_t psr;
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};
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struct stack_frame
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{
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/* r4 ~ r11 register */
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rt_uint32_t r4;
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rt_uint32_t r5;
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rt_uint32_t r6;
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rt_uint32_t r7;
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rt_uint32_t r8;
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rt_uint32_t r9;
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rt_uint32_t r10;
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rt_uint32_t r11;
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struct exception_stack_frame exception_stack_frame;
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};
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/* flag in interrupt handling */
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rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
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rt_uint32_t rt_thread_switch_interrupt_flag;
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/* exception hook */
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static rt_err_t (*rt_exception_hook)(void *context) = RT_NULL;
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/**
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* This function will initialize thread stack
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*
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* @param tentry the entry of thread
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* @param parameter the parameter of entry
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* @param stack_addr the beginning stack address
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* @param texit the function will be called when thread exit
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*
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* @return stack address
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*/
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rt_uint8_t *rt_hw_stack_init(void *tentry,
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void *parameter,
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rt_uint8_t *stack_addr,
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void *texit)
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{
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struct stack_frame *stack_frame;
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rt_uint8_t *stk;
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unsigned long i;
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stk = stack_addr + sizeof(rt_uint32_t);
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stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8);
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stk -= sizeof(struct stack_frame);
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stack_frame = (struct stack_frame *)stk;
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/* init all register */
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for (i = 0; i < sizeof(struct stack_frame) / sizeof(rt_uint32_t); i ++)
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{
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((rt_uint32_t *)stack_frame)[i] = 0xdeadbeef;
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}
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stack_frame->exception_stack_frame.r0 = (unsigned long)parameter; /* r0 : argument */
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stack_frame->exception_stack_frame.r1 = 0; /* r1 */
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stack_frame->exception_stack_frame.r2 = 0; /* r2 */
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stack_frame->exception_stack_frame.r3 = 0; /* r3 */
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stack_frame->exception_stack_frame.r12 = 0; /* r12 */
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stack_frame->exception_stack_frame.lr = (unsigned long)texit; /* lr */
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stack_frame->exception_stack_frame.pc = (unsigned long)tentry; /* entry point, pc */
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stack_frame->exception_stack_frame.psr = 0x01000000L; /* PSR */
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/* return task's current stack address */
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return stk;
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}
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/**
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* This function set the hook, which is invoked on fault exception handling.
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*
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* @param exception_handle the exception handling hook function.
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*/
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void rt_hw_exception_install(rt_err_t (*exception_handle)(void* context))
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{
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rt_exception_hook = exception_handle;
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}
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/*
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* fault exception handler
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*/
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void rt_hw_hard_fault_exception(struct exception_stack_frame* context)
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{
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extern long list_thread(void);
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if (rt_exception_hook != RT_NULL)
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{
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rt_err_t result;
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result = rt_exception_hook(context);
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if (result == RT_EOK) return;
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}
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rt_kprintf("psr: 0x%08x\n", context->psr);
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rt_kprintf(" pc: 0x%08x\n", context->pc);
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rt_kprintf(" lr: 0x%08x\n", context->lr);
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rt_kprintf("r12: 0x%08x\n", context->r12);
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rt_kprintf("r03: 0x%08x\n", context->r3);
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rt_kprintf("r02: 0x%08x\n", context->r2);
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rt_kprintf("r01: 0x%08x\n", context->r1);
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rt_kprintf("r00: 0x%08x\n", context->r0);
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rt_kprintf("hard fault on thread: %s\n", rt_thread_self()->name);
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#ifdef RT_USING_FINSH
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list_thread();
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#endif
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while (1);
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}
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/**
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* shutdown CPU
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*/
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void rt_hw_cpu_shutdown(void)
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{
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rt_kprintf("shutdown...\n");
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RT_ASSERT(0);
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}
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#ifdef RT_USING_CPU_FFS
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/**
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* This function finds the first bit set (beginning with the least significant bit)
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* in value and return the index of that bit.
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*
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* Bits are numbered starting at 1 (the least significant bit). A return value of
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* zero from any of these functions means that the argument was zero.
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*
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* @return return the index of the first bit set. If value is 0, then this function
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* shall return 0.
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*/
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#if defined(__CC_ARM)
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__asm int __rt_ffs(int value)
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{
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CMP r0, #0x00
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BEQ exit
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RBIT r0, r0
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CLZ r0, r0
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ADDS r0, r0, #0x01
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exit
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BX lr
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}
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#elif defined(__IAR_SYSTEMS_ICC__)
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int __rt_ffs(int value)
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{
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if (value == 0) return value;
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__ASM("RBIT r0, r0");
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__ASM("CLZ r0, r0");
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__ASM("ADDS r0, r0, #0x01");
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}
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#elif defined(__GNUC__)
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int __rt_ffs(int value)
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{
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return __builtin_ffs(value);
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}
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#endif
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#endif
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