149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018-09-01 xuzhuoyi the first version.
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* 2019-07-03 zhaoxiaowei add support for __rt_ffs.
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* 2019-12-05 xiaolifan add support for hardware fpu32
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*/
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#include <rtthread.h>
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/* exception and interrupt handler table */
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rt_uint32_t rt_interrupt_from_thread;
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rt_uint32_t 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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extern rt_uint16_t rt_hw_get_st0(void);
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extern rt_uint16_t rt_hw_get_st1(void);
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extern int rt_hw_calc_csb(int value);
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struct exception_stack_frame
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{
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rt_uint32_t t_st0;
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rt_uint32_t acc;
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rt_uint32_t p;
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rt_uint32_t ar1_ar0;
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rt_uint32_t dp_st1;
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rt_uint32_t dbgstat_ier;
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rt_uint32_t return_address;
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};
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struct stack_frame
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{
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struct exception_stack_frame exception_stack_frame;
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/* r4 ~ r11 register */
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rt_uint16_t ar0h;
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rt_uint16_t ar1h;
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rt_uint32_t xar2;
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rt_uint32_t xar3;
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rt_uint32_t xar4;
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rt_uint32_t xar5;
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rt_uint32_t xar6;
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rt_uint32_t xar7;
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rt_uint32_t xt;
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rt_uint32_t rpc;
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#ifdef __TMS320C28XX_FPU32__
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rt_uint32_t rb;
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rt_uint32_t stf;
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rt_uint32_t r0h;
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rt_uint32_t r1h;
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rt_uint32_t r2h;
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rt_uint32_t r3h;
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rt_uint32_t r4h;
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rt_uint32_t r5h;
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rt_uint32_t r6h;
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rt_uint32_t r7h;
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#endif
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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;
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stk = (rt_uint8_t *)RT_ALIGN((rt_uint32_t)stk, 8);
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//stk -= sizeof(struct stack_frame);
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stk += 1;
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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.t_st0 = 0x11110000 | rt_hw_get_st0();
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stack_frame->exception_stack_frame.acc = 0x33332222;
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stack_frame->exception_stack_frame.ar1_ar0 = 0x00001111 & (unsigned long)parameter; /* ar0 : argument */
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stack_frame->exception_stack_frame.p = 0x55554444; /* p */
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stack_frame->exception_stack_frame.dp_st1 = (0x00000000) | rt_hw_get_st1() & 0xFFFFFFFE; /* dp_st1 */
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stack_frame->exception_stack_frame.dbgstat_ier = 0; /* dbgstat_ier */
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stack_frame->exception_stack_frame.return_address = (unsigned long)tentry; /* return_address */
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stack_frame->rpc = (unsigned long)texit;
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#ifdef __TMS320C28XX_FPU32__
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stack_frame->stf = 0x00000200;
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stack_frame->rb = 0;
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#endif
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/* return task's current stack address */
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return stk + sizeof(struct stack_frame);
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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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struct exception_info
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{
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rt_uint32_t exc_return;
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struct stack_frame stack_frame;
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};
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#ifdef RT_USING_CPU_FFS
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/*
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* This function called rt_hw_calc_csb to finds the first bit set in value.
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* rt_hw_calc_csb is a native assembly program that use "CSB" instruction in C28x.
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* When you use this function, remember that "int" is only 16-bit in C28x's C compiler.
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* If value is a number bigger that 0xFFFF, trouble may be caused.
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* Maybe change "int __rt_ffs(int value)" to "rt_int32_t __rt_ffs(rt_int32_t value)" will be better.
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*/
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int __rt_ffs(int value)
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{
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return rt_hw_calc_csb(value);
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}
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#endif
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/**
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* shutdown CPU
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*/
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RT_WEAK 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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