OSO/TinyCC
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Generate PIC code so that we can create shared objects properly.

Browse Source 
- Add got_table in TCCState. This approach is naive and the distance between executable code and GOT can be longer than 32bit.
- Handle R_X86_64_GOTPCREL properly. We use got_table for TCC_OUTPUT_MEMORY case for now.
- Fix load() and store() so that they access global variables via GOT.
This commit is contained in:
Shinichiro Hamaji
2009-04-13 00:27:04 +09:00
committed by grischka
parent 6c10429aa5
commit 830b7533c9
3 changed files with 128 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
tccelf.c
View File

@ -502,6 +502,25 @@ static unsigned long add_jmp_table(TCCState *s1, unsigned long val)
*(unsigned long *)(p + 6) = val;
return (unsigned long)p;
}
#define GOT_TABLE_ENTRY_MAX_NUM 4096
static unsigned long add_got_table(TCCState *s1, unsigned long val)
{
unsigned long *p;
if (!s1->got_table) {
int size = sizeof(void *) * GOT_TABLE_ENTRY_MAX_NUM;
s1->got_table_num = 0;
s1->got_table = (char *)tcc_malloc(size);
}
if (s1->got_table_num == GOT_TABLE_ENTRY_MAX_NUM) {
error("relocating >%d symbols are not supported",
GOT_TABLE_ENTRY_MAX_NUM);
}
p = s1->got_table + s1->got_table_num;
s1->got_table_num++;
*p = val;
return (unsigned long)p;
}
#endif
/* relocate a given section (CPU dependent) */
@ -727,11 +746,13 @@ static void relocate_section(TCCState *s1, Section *s)
*(int *)ptr = val;
break;
case R_X86_64_GOTPCREL:
*(int *)ptr += s1->got->sh_addr - addr;
/* XXX: is this OK? */
if (s1->output_type == TCC_OUTPUT_DLL) {
*(int *)ptr += s1->got_offsets[sym_index] - 4;
if (s1->output_type == TCC_OUTPUT_MEMORY) {
val = add_got_table(s1, val - rel->r_addend) + rel->r_addend;
*(int *)ptr += val - addr;
break;
}
*(int *)ptr += (s1->got->sh_addr - addr +
s1->got_offsets[sym_index] - 4);
break;
case R_X86_64_GOTTPOFF:
*(int *)ptr += val - s1->got->sh_addr;