mirrors/tinycc
1
0
Fork 0
mirror of https://github.com/frida/tinycc synced 2025-01-11 22:29:18 +03:00
Code Issues Packages Projects Releases Wiki Activity

Fix calling function pointers casted from intergers in DLL

Browse Source 
The code generated for "((void (*)(void))0x12345678)()" will be a single "CALL 0x12345678" in previous code.
However, this will not work for DLLs, because "CALL imm" is PC related, DLL relocation will break the code.
This commit fixed the problem by forcing TCC generates indirect CALLs in this situation.
This commit is contained in:
Zhang Boyang 2017-09-09 21:11:56 +08:00
parent 02370acdc9
commit b39810ff78
1 changed files with 3 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
i386-gen.c
View File

@ -345,17 +345,9 @@ static void gen_static_call(int v)
static void gcall_or_jmp(int is_jmp)
{
int r;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* constant case */
if (vtop->r & VT_SYM) {
/* relocation case */
greloc(cur_text_section, vtop->sym,
ind + 1, R_386_PC32);
} else {
/* put an empty PC32 relocation */
put_elf_reloc(symtab_section, cur_text_section,
ind + 1, R_386_PC32, 0);
}
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST && (vtop->r & VT_SYM)) {
/* constant and relocation case */
greloc(cur_text_section, vtop->sym, ind + 1, R_386_PC32);
oad(0xe8 + is_jmp, vtop->c.i - 4); /* call/jmp im */
} else {
/* otherwise, indirect call */