rt-thread/libcpu/risc-v/t-head/c906/symbol_analysis.c

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/*
* Copyright lizhirui
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-05-18 lizhirui the first version
* 2021-05-20 lizhirui add os debug support
*/
#include <rtthread.h>
#include "symbol_analysis.h"
#define MEMORY_BASE 0x40000000
#define MEMORY_SIZE (128 * 0x100000)
extern rt_size_t _osdebug_start;
static os_symtab_header *symtab_header = (os_symtab_header *)&_osdebug_start;
//该函数用于在指定的表中查找某个地址对应的符号的描述结构体指针,返回值的符号遵循规则详见文档
os_symtab_item *find_symbol_table(rt_size_t symbol_table_addr,rt_size_t symbol_num,rt_size_t address)
{
rt_size_t left = 0;
rt_size_t right = symbol_num;
os_symtab_item *sym_table = (os_symtab_item *)((rt_size_t)&_osdebug_start + symbol_table_addr);
while(left < right)
{
rt_size_t mid = (left + right) >> 1;
//rt_kprintf("left = %d,right = %d,mid = %d\n",left,right,mid);
if(address < sym_table[mid].address)
{
right = mid;
while((right < symbol_num) && ((right - 1) >= 0) && (sym_table[right].address == sym_table[right - 1].address))
{
right--;
}
}
else if(address == sym_table[mid].address)
{
left = mid + 1;
break;
}
else
{
left = mid;
while((left >= 0) && ((left + 1) < symbol_num) && (sym_table[left].address == sym_table[left + 1].address))
{
left++;
}
left++;
}
}
left--;
if(left == ((rt_size_t)-1))
{
return RT_NULL;
}
while((left < symbol_num) && ((left - 1) >= 0) && (sym_table[left].address == sym_table[left - 1].address))
{
left--;
}
return &sym_table[left];
}
//该函数用于根据给定的符号指针从字符串表中找到对应的符号名指针并返回
const char *get_symbol_name(os_symtab_item *symbol)
{
return (const char *)((rt_size_t)&_osdebug_start + symtab_header -> string_table_offset + symbol -> name_offset);
}
//该函数可以根据给定的符号和地址向中断打印出标准格式的符号信息
void print_symbol(os_symtab_item *symbol,rt_size_t address)
{
rt_kprintf("<%s(0x%p)",get_symbol_name(symbol),symbol -> address);
if(symbol -> size)
{
rt_kprintf(" : 0x%x>",symbol -> size);
}
else
{
rt_kprintf(">");
}
if(address > symbol -> address)
{
rt_kprintf(" + 0x%x",address - symbol -> address);
}
}
//该函数用于打印出一个地址关联的全部符号信息
void print_symbol_info(rt_size_t address,rt_bool_t function)
{
os_symtab_item *function_symbol = find_symbol_table(symtab_header -> function_table_offset,symtab_header -> function_table_num,address);
os_symtab_item *object_symbol = find_symbol_table(symtab_header -> object_table_offset,symtab_header -> object_table_num,address);
os_symtab_item *general_symbol = find_symbol_table(symtab_header -> general_symbol_table_offset,symtab_header -> general_symbol_table_num,address);
const char *dot = "";
rt_bool_t valid = RT_FALSE;
if(function)
{
while(function_symbol != RT_NULL)
{
if((function_symbol -> address + function_symbol -> size) > address)
{
rt_kprintf(dot);
print_symbol(function_symbol,address);
dot = ",";
valid = RT_TRUE;
}
if(((rt_size_t)(function_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> function_table_offset + symtab_header -> function_table_num * sizeof(os_symtab_item)))
{
break;
}
if(function_symbol[0].address == function_symbol[1].address)
{
function_symbol++;
}
break;
}
if(!valid)
{
while(general_symbol != RT_NULL)
{
rt_kprintf(dot);
print_symbol(general_symbol,address);
dot = ",";
valid = RT_TRUE;
if(((rt_size_t)(general_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> general_symbol_table_offset + symtab_header -> general_symbol_table_num * sizeof(os_symtab_item)))
{
break;
}
if(general_symbol[0].address == general_symbol[1].address)
{
general_symbol++;
}
break;
}
while(object_symbol != RT_NULL)
{
if((object_symbol -> address + object_symbol -> size) > address)
{
rt_kprintf(dot);
print_symbol(object_symbol,address);
dot = ",";
valid = RT_TRUE;
}
if(((rt_size_t)(object_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> object_table_offset + symtab_header -> object_table_num * sizeof(os_symtab_item)))
{
break;
}
if(object_symbol[0].address == object_symbol[1].address)
{
object_symbol++;
}
break;
}
}
}
else
{
while(object_symbol != RT_NULL)
{
if((object_symbol -> address + object_symbol -> size) > address)
{
rt_kprintf(dot);
print_symbol(object_symbol,address);
dot = ",";
valid = RT_TRUE;
}
if(((rt_size_t)(object_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> object_table_offset + symtab_header -> object_table_num * sizeof(os_symtab_item)))
{
break;
}
if(object_symbol[0].address == object_symbol[1].address)
{
object_symbol++;
}
break;
}
if(!valid)
{
while(general_symbol != RT_NULL)
{
rt_kprintf(dot);
print_symbol(general_symbol,address);
dot = ",";
valid = RT_TRUE;
if(((rt_size_t)(general_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> general_symbol_table_offset + symtab_header -> general_symbol_table_num * sizeof(os_symtab_item)))
{
break;
}
if(general_symbol[0].address == general_symbol[1].address)
{
general_symbol++;
}
break;
}
while(function_symbol != RT_NULL)
{
if((function_symbol -> address + function_symbol -> size) > address)
{
rt_kprintf(dot);
print_symbol(function_symbol,address);
dot = ",";
valid = RT_TRUE;
}
if(((rt_size_t)(function_symbol + 1)) >= (((rt_size_t)&_osdebug_start) + symtab_header -> function_table_offset + symtab_header -> function_table_num * sizeof(os_symtab_item)))
{
break;
}
if(function_symbol[0].address == function_symbol[1].address)
{
function_symbol++;
}
break;
}
}
}
if(dot == "")
{
rt_kprintf("<Unknown Symbol>");
}
}
//该函数用于在出错时打印出栈跟踪信息
void print_stacktrace(rt_size_t epc,rt_size_t fp)
{
rt_kprintf("-----------------------------Dump Stacktrace----------------------------\n\n");
rt_size_t sp = fp;
rt_size_t i = 0;
rt_kprintf("address 0x%p(",epc);
print_symbol_info(epc,RT_TRUE);
rt_kprintf(")\n\n");
while(1)
{
if((sp >= MEMORY_BASE) && (sp < (MEMORY_BASE + MEMORY_SIZE)))
{
//rt_kprintf("%d: 0x%p\n",i,sp);
rt_size_t *stack = (rt_size_t *)(sp - sizeof(rt_size_t) * 2);
rt_size_t ra = stack[1];
if(!ra)
{
break;
}
rt_kprintf("return to 0x%p(",ra);
print_symbol_info(ra,RT_TRUE);
rt_kprintf(")\n\n");
//rt_kprintf("ra = 0x%p,fp = 0x%p\n",stack[1],stack[0]);
sp = stack[0];
i++;
}
else
{
break;
}
}
rt_kprintf("---------------------------------Dump OK--------------------------------\n");
}