github-repos/tinycc
1
0
Fork 0
mirror of https://github.com/mirror/tinycc.git synced 2025-01-15 05:20:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

gen_addrpc32: absolute ptr needs *ABS* relocation

Browse Source 
Dereferencing of absolute pointers is broken on x86_64, eg:

*(int*)NULL does not segfault but returns -4 instead
*(char*)(-10L << 20) does not return 0x55 (vsyscall page, push rbp)
This commit is contained in:
Zdenek Pavlas 2017-09-11 05:56:47 -07:00
parent 078d8c2c5a
commit 870271ea07
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
x86_64-gen.c
View File

@ -257,8 +257,7 @@ ST_FUNC void gen_addr64(int r, Sym *sym, int64_t c)
/* output constant with relocation if 'r & VT_SYM' is true */
ST_FUNC void gen_addrpc32(int r, Sym *sym, int c)
{
if (r & VT_SYM)
greloca(cur_text_section, sym, ind, R_X86_64_PC32, c-4), c=4;
greloca(cur_text_section, sym, ind, R_X86_64_PC32, 0);
gen_le32(c-4);
}