https://sourceware.org/bugzilla/show_bug.cgi?id=22874
Bug ID: 22874
Summary: GAS does not emit multibyte nops before a function
symbol
Product: binutils
Version: 2.31 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: mliska at suse dot cz
Target Milestone: ---
$ cat nops.c
void
__attribute__((aligned(128)))
foo (int invariant)
{
for (;;)
;
}
void
__attribute__((aligned(64)))
foo2 (int invariant)
{
}
int main() {}
$ gcc nops.c -O2
$ objdump -S a.out
[snip]
00000000004004b0 <__do_global_dtors_aux>:
4004b0: 80 3d 71 0b 20 00 00 cmpb $0x0,0x200b71(%rip) #
601028 <__TMC_END__>
4004b7: 75 17 jne 4004d0
<__do_global_dtors_aux+0x20>
4004b9: 55 push %rbp
4004ba: 48 89 e5 mov %rsp,%rbp
4004bd: e8 7e ff ff ff callq 400440 <deregister_tm_clones>
4004c2: c6 05 5f 0b 20 00 01 movb $0x1,0x200b5f(%rip) #
601028 <__TMC_END__>
4004c9: 5d pop %rbp
4004ca: c3 retq
4004cb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
4004d0: f3 c3 repz retq
4004d2: 0f 1f 40 00 nopl 0x0(%rax)
4004d6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
4004dd: 00 00 00
00000000004004e0 <frame_dummy>:
4004e0: 55 push %rbp
4004e1: 48 89 e5 mov %rsp,%rbp
4004e4: 5d pop %rbp
4004e5: eb 89 jmp 400470 <register_tm_clones>
4004e7: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
4004ee: 00 00 00
4004f1: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
4004f8: 00 00 00
4004fb: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
0000000000400500 <foo>:
400500: eb fe jmp 400500 <foo>
400502: 90 nop
400503: 90 nop
400504: 90 nop
400505: 90 nop
400506: 90 nop
400507: 90 nop
400508: 90 nop
400509: 90 nop
40050a: 90 nop
40050b: 90 nop
40050c: 90 nop
40050d: 90 nop
40050e: 90 nop
40050f: 90 nop
400510: 90 nop
400511: 90 nop
400512: 90 nop
400513: 90 nop
400514: 90 nop
400515: 90 nop
400516: 90 nop
400517: 90 nop
400518: 90 nop
400519: 90 nop
40051a: 90 nop
40051b: 90 nop
40051c: 90 nop
40051d: 90 nop
40051e: 90 nop
40051f: 90 nop
400520: 90 nop
400521: 90 nop
400522: 90 nop
400523: 90 nop
400524: 90 nop
400525: 90 nop
400526: 90 nop
400527: 90 nop
400528: 90 nop
400529: 90 nop
40052a: 90 nop
40052b: 90 nop
40052c: 90 nop
40052d: 90 nop
40052e: 90 nop
40052f: 90 nop
400530: 90 nop
400531: 90 nop
400532: 90 nop
400533: 90 nop
400534: 90 nop
400535: 90 nop
400536: 90 nop
400537: 90 nop
400538: 90 nop
400539: 90 nop
40053a: 90 nop
40053b: 90 nop
40053c: 90 nop
40053d: 90 nop
40053e: 90 nop
40053f: 90 nop
0000000000400540 <foo2>:
400540: f3 c3 repz retq
400542: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
400549: 00 00 00
40054c: 0f 1f 40 00 nopl 0x0(%rax)
[snip]
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