[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Bug binutils/19660] [libopcodes] [x86] REP prefixes shown incorrectly
From: |
hjl.tools at gmail dot com |
Subject: |
[Bug binutils/19660] [libopcodes] [x86] REP prefixes shown incorrectly |
Date: |
Mon, 18 Apr 2016 16:54:12 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=19660
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to njholcomb from comment #2)
> Created attachment 9201 [details]
> Shows rep prefixes on non-string instructions
I got
0000000000000000 <main>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: f3 e0 58 repz loopne 5f <main+0x5f>
7: f2 00 00 repnz add %al,(%rax)
a: 00 b8 00 00 00 00 add %bh,0x0(%rax)
10: 5d pop %rbp
11: c3 retq
repz is nop before loopne. repnz is UD before add:
Program received signal SIGSEGV, Segmentation fault.
0x000000000040048f in main ()
(gdb) disass
Dump of assembler code for function main:
0x0000000000400488 <+0>: push %rbp
0x0000000000400489 <+1>: mov %rsp,%rbp
0x000000000040048c <+4>: repz loopne 0x4004e7 <__libc_csu_init+71>
=> 0x000000000040048f <+7>: repnz add %al,(%rax)
0x0000000000400492 <+10>: add %bh,0x0(%rax)
0x0000000000400498 <+16>: pop %rbp
0x0000000000400499 <+17>: retq
End of assembler dump.
(gdb)
Disassembler output looks OK to me.
--
You are receiving this mail because:
You are on the CC list for the bug.