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[Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcod
From: |
fruffell at cs dot uwaterloo dot ca |
Subject: |
[Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly. |
Date: |
20 Mar 2007 14:51:43 -0000 |
------- Additional Comments From fruffell at cs dot uwaterloo dot ca
2007-03-20 14:51 -------
Created an attachment (id=1633)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=1633&action=view)
A test case illustrated the a rexB prefixed 0x90 instruction is not a nop.
gcc -c xchg-eax-stub.c
as xchg-eax.asm -o xchg-eax.o
gcc -o xchg-eax xchg-eax.o xchg-eax-stub.o
If you change 0x41 in the asm file to 0x90 the output will show that 0x90 is a
true nop. With the 0x41 in the asm file, the output will show that 0x41 0x90
is not a nop.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4218
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- [Bug binutils/4218] New: objdump on AMD64 fails to decode prefixed 0x90 opcode properly., fruffell at cs dot uwaterloo dot ca, 2007/03/20
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly.,
fruffell at cs dot uwaterloo dot ca <=
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly., hjl at lucon dot org, 2007/03/21
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly., hjl at lucon dot org, 2007/03/21
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly., fruffell at cs dot uwaterloo dot ca, 2007/03/21
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly., hjl at lucon dot org, 2007/03/21
- [Bug binutils/4218] objdump on AMD64 fails to decode prefixed 0x90 opcode properly., hjl at lucon dot org, 2007/03/21