作者enthos (影斯作业系统)
看板CompilerDev
标题[分享] ELFsh 使用范例
时间Mon Jun 8 16:27:19 2020
早期的 forth image 都没有 symbol table，不易用 gdb 除错，
所以可以用 elfsh 工具增加这项内容。
gforth Smake.f 会造出执行档 sforth，把函式名字和位置列印出来，
之後就可以输出有 symbol table 的 sforth.new 执行档。
//
http://elfsh.asgardlabs.org/
//
http://www.eresi-project.org/
//
https://github.com/thorkill/eresi
// ** symtab_extend.c for elfsh testsuite
#include "libelfsh.h"
#define INPUT_FILE "./sforth"
#define OUTPUT_FILE "./sforth.new"
elfshobj_t *file;
int linkcode (char *name, int addr)
{
int ret;
elfsh_Sym sym;
// name = "SEARCH-WORDLIST";
// sym = elfsh_create_symbol(addr, 21, STT_FUNC, 0, 0, 1);
printf ("name is %s, addr 0x%x \n", name, addr);
sym = elfsh_create_symbol(addr, 42, 0, 0, 0, 1);
ret = elfsh_insert_symbol(file->secthash[ELFSH_SECTION_SYMTAB],
&sym, name);
}
int main(int argc, char **argv)
{
int ret;
elfsh_Sym sym;
// ...
sym = elfsh_create_symbol(0x11152, 21, STT_FUNC, 0, 0, 1);
ret = elfsh_insert_symbol(file->secthash[ELFSH_SECTION_SYMTAB],
&sym, name);
while (gets(buf)) {
if (2 == sscanf(buf, "linkcode %s 0x%x", buf2, &addr)) {
linkcode(buf2, addr);
}
}
ret = elfsh_save_obj(file, buf2);
printf("Relinking *%s* \n", ret ? "Error" : "OK");
}
sforth4addr.txt
/* gforth Smake.f ;*/
linkcode MY_COLD 0x10000
linkcode E820 0x10024
linkcode AH88 0x10043
linkcode SYSCALL0 0x1004B
linkcode SYSCALL1 0x1004E
linkcode SYSCALL2 0x10056
linkcode SYSCALL3 0x10061
linkcode SYSCALL4 0x1006F
linkcode SYSCALL5 0x10082
...
--
※ 发信站: 批踢踢实业坊(ptt.cc), 来自: 114.43.77.156 (台湾)
※ 文章网址: https://webptt.com/cn.aspx?n=bbs/CompilerDev/M.1591604848.A.CDC.html