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