Disassembler prints incorrect bytemode for SSE insns in Intel syntax.
% objdump -v
GNU objdump (GNU Binutils) 2.17.50.20070723
Copyright 2007 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
% cat sse.s
.byte 0xF2, 0x0F, 0x5E, 0x00
.byte 0xF3, 0x0F, 0x5E, 0x00
.byte 0xF2, 0x0F, 0x5F, 0x00
.byte 0xF3, 0x0F, 0x5F, 0x00
.byte 0xF2, 0x0F, 0x5D, 0x00
.byte 0xF3, 0x0F, 0x5D, 0x00
.byte 0xF3, 0x0F, 0x10, 0x00
.byte 0xF3, 0x0F, 0x11, 0x00
.byte 0xF2, 0x0F, 0x10, 0x00
.byte 0xF2, 0x0F, 0x11, 0x00
.byte 0xF2, 0x0F, 0x59, 0x00
.byte 0xF3, 0x0F, 0x59, 0x00
.byte 0xF3, 0x0F, 0x53, 0x00
.byte 0xF3, 0x0F, 0x52, 0x00
.byte 0xF2, 0x0F, 0x51, 0x00
.byte 0xF3, 0x0F, 0x51, 0x00
.byte 0xF2, 0x0F, 0x5C, 0x00
.byte 0xF3, 0x0F, 0x5C, 0x00
.byte 0xF3, 0x0F, 0x5A, 0x00
.byte 0xF2, 0x0F, 0x5A, 0x00
% as sse.s -o sse.o
% objdump -dw -Mintel --section="LC_SEGMENT.__TEXT.__text" sse.o
sse.o: file format mach-o-le
Disassembly of section LC_SEGMENT.__TEXT.__text:
0000000000000000 <LC_SEGMENT.__TEXT.__text>:
0: f2 0f 5e 00 divsd xmm0,XMMWORD PTR [eax]
4: f3 0f 5e 00 divss xmm0,XMMWORD PTR [eax]
8: f2 0f 5f 00 maxsd xmm0,XMMWORD PTR [eax]
c: f3 0f 5f 00 maxss xmm0,XMMWORD PTR [eax]
10: f2 0f 5d 00 minsd xmm0,XMMWORD PTR [eax]
14: f3 0f 5d 00 minss xmm0,XMMWORD PTR [eax]
18: f3 0f 10 00 movss xmm0,XMMWORD PTR [eax]
1c: f3 0f 11 00 movss XMMWORD PTR [eax],xmm0
20: f2 0f 10 00 movsd xmm0,XMMWORD PTR [eax]
24: f2 0f 11 00 movsd XMMWORD PTR [eax],xmm0
28: f2 0f 59 00 mulsd xmm0,XMMWORD PTR [eax]
2c: f3 0f 59 00 mulss xmm0,XMMWORD PTR [eax]
30: f3 0f 53 00 rcpss xmm0,XMMWORD PTR [eax]
34: f3 0f 52 00 rsqrtss xmm0,XMMWORD PTR [eax]
38: f2 0f 51 00 sqrtsd xmm0,XMMWORD PTR [eax]
3c: f3 0f 51 00 sqrtss xmm0,XMMWORD PTR [eax]
40: f2 0f 5c 00 subsd xmm0,XMMWORD PTR [eax]
44: f3 0f 5c 00 subss xmm0,XMMWORD PTR [eax]
48: f3 0f 5a 00 cvtss2sd xmm0,XMMWORD PTR [eax]
4c: f2 0f 5a 00 cvtsd2ss xmm0,XMMWORD PTR [eax]
All above modes are XMMWORD, but that's wrong.
Intel(R) 64 and IA-32 Architectures Software Developer's Manual Volume 2A & 2B
In the manuals, it's written as follows.
Opcode Instruction
F2 0F 5E /r DIVSD xmm1, xmm2/m64
F3 0F 5E /r DIVSS xmm1, xmm2/m32
F2 0F 5F /r MAXSD xmm1, xmm2/m64
F3 0F 5F /r MAXSS xmm1, xmm2/m32
F2 0F 5D /r MINSD xmm1, xmm2/m64
F3 0F 5D /r MINSS xmm1, xmm2/m32
F3 0F 10 /r MOVSS xmm1, xmm2/m32
F3 0F 11 /r MOVSS xmm2/m32, xmm
F2 0F 10 /r MOVSD xmm1, xmm2/m64
F2 0F 11 /r MOVSD xmm2/m64, xmm1
F2 0F 59 /r MULSD xmm1, xmm2/m64
F3 0F 59 /r MULSS xmm1, xmm2/m32
F3 0F 53 /r RCPSS xmm1, xmm2/m32
F3 0F 52 /r RSQRTSS xmm1, xmm2/m32
F2 0F 51 /r SQRTSD xmm1, xmm2/m64
F3 0F 51 /r SQRTSS xmm1, xmm2/m32
F2 0F 5C /r SUBSD xmm1, xmm2/m64
F3 0F 5C /r SUBSS xmm1, xmm2/m32
F3 0F 5A /r CVTSS2SD xmm1, xmm2/m32
F2 0F 5A /r CVTSD2SS xmm1, xmm2/m64
--
Summary: Incorrect bytemode in x86 disassembler
Product: binutils
Version: 2.18 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: ht at inter7 dot jp
CC: bug-binutils at gnu dot org
GCC host triplet: i686-apple-darwin
http://sourceware.org/bugzilla/show_bug.cgi?id=4834
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