[分享] ELFsh 使用範例
早期的 forth image 都沒有 symbol table，不易用 gdb 除錯，
所以可以用 elfsh 工具增加這項內容。
gforth Smake.f 會造出執行檔 sforth，把函式名字和位置列印出來，
之後就可以輸出有 symbol table 的 sforth.new 執行檔。
// 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
...
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