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gen_addrpc32: absolute ptr needs *ABS* relocation 

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)
master
Zdenek Pavlas 2017-09-11 05:56:47 -07:00
parent 078d8c2c5a
commit 870271ea07
1 changed files with 1 additions and 2 deletions
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3
x86_64-gen.c
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@ -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);
}