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/*
* File : mips_backtrace.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2016��9��11�� Urey the first version
*/
#include <rtthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include "mips.h"
/*********************************************************************************************************
ָ���
*********************************************************************************************************/
#define ADDUI_SP_INST 0x27bd0000
#define SW_RA_INST 0xafbf0000
#define JR_RA_INST 0x03e00008
#define INST_OP_MASK 0xffff0000
#define INST_OFFSET_MASK 0x0000ffff
#define abs(s) ((s) < 0 ? -(s):(s))
int backtrace_ctx(mips_reg_ctx *ctx)
{
unsigned long *addr;
unsigned long *pc, *ra, *sp;
size_t ra_offset;
size_t stack_size;
int depth;
int size = 8;
pc = (unsigned long *)(unsigned long)ctx->CP0EPC;
ra = (unsigned long *)(unsigned long)ctx->regs[REG_RA];
sp = (unsigned long *)(unsigned long)ctx->regs[REG_SP];
rt_kprintf("[0x%08x]\n", pc);
if (size == 1) return 1;
ra_offset = stack_size = 0;
for (addr = ra; !ra_offset || !stack_size; --addr)
{
switch (*addr & INST_OP_MASK) {
case ADDUI_SP_INST:
stack_size = abs((short)(*addr&INST_OFFSET_MASK));
break;
case SW_RA_INST:
ra_offset = (short)(*addr&INST_OFFSET_MASK);
break;
case 0x3c1c0000:
goto out_of_loop;
default:
break;
}
}
out_of_loop:
if (ra_offset) ra = *(unsigned long **)((unsigned long)sp + ra_offset);
if (stack_size) sp = (unsigned long *)((unsigned long)sp + stack_size);
// repeat backwar scanning
for (depth = 1; depth < size && ra && ra != (unsigned long *)0xffffffff; ++depth)
{
rt_kprintf("RA[%2d] : [0x%08x]\n", depth ,ra);
ra_offset = 0;
stack_size = 0;
for ( addr = ra; !ra_offset || !stack_size; -- addr )
{
switch( *addr & INST_OP_MASK)
{
case ADDUI_SP_INST:
stack_size = abs((short)(*addr&INST_OFFSET_MASK));
break;
case SW_RA_INST:
ra_offset = abs((short)(*addr&INST_OFFSET_MASK));
break;
case 0x3c1c0000:
return depth +1;
default:
break;
}
}
ra = *(unsigned long **)((unsigned long)sp + ra_offset);
sp = (unsigned long *)((unsigned long)sp + stack_size);
}
return depth;
}
int backtrace(void)
{
unsigned long *addr;
unsigned long *ra;
unsigned long *sp;
int size = 8, depth;
size_t ra_offset;
size_t stack_size;
// get current $a and $sp
__asm__ __volatile__ (
" move %0, $ra\n"
" move %1, $sp\n"
: "=r"(ra), "=r"(sp)
);
// scanning to find the size of hte current stack frame
stack_size = 0;
for ( addr = (unsigned long *)backtrace; !stack_size; ++addr)
{
if ((*addr & INST_OP_MASK ) == ADDUI_SP_INST )
stack_size = abs((short)(*addr&INST_OFFSET_MASK));
else if ( *addr == JR_RA_INST )
break;
}
sp = (unsigned long *) (( unsigned long )sp + stack_size);
// repeat backwar scanning
for ( depth = 0; depth < size && ((( unsigned long )ra > KSEG0BASE) && (( unsigned long )ra < KSEG1BASE)); ++ depth )
{
rt_kprintf("RA[%2d] : [0x%08x]\n", depth, ra);
{
extern void rt_thread_exit(void);
if ((uint32_t)ra == (uint32_t)(rt_thread_exit))
return depth;
}
ra_offset = 0;
stack_size = 0;
for ( addr = ra; !ra_offset || !stack_size; -- addr )
{
switch( *addr & INST_OP_MASK)
{
case ADDUI_SP_INST:
stack_size = abs((short)(*addr&INST_OFFSET_MASK));
break;
case SW_RA_INST:
ra_offset = (short)(*addr&INST_OFFSET_MASK);
break;
case 0x3c1c0000:
return depth +1;
default:
break;
}
}
ra = *(unsigned long **)((unsigned long)sp + ra_offset);
sp = (unsigned long*) ((unsigned long)sp+stack_size );
}
return depth;
}
#include <rtthread.h>
extern long list_thread(void);
void assert_hook(const char* ex, const char* func, rt_size_t line)
{
backtrace();
list_thread();
rt_kprintf("(%s) assertion failed at function:%s, line number:%d \n", ex, func, line);
}
int backtrace_init(void)
{
#ifdef RT_DEBUG
rt_assert_set_hook(assert_hook);
#endif
return 0;
}
INIT_DEVICE_EXPORT(backtrace_init);
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