https://sourceware.org/bugzilla/show_bug.cgi?id=16891
Bug ID: 16891
Summary: libopcodes decodes x86 26 9B as 'fwait' not 'es'
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: rsc at swtch dot com
Created attachment 7572
--> https://sourceware.org/bugzilla/attachment.cgi?id=7572&action=edit
test binary with 26 9B at beginning of text
libopcodes decodes the byte sequence 26 9B as the x86 instruction FWAIT of
length 1.
The 26 is a segment prefix (ES), and the 9B is the FWAIT. I could understand
fwait of length 2 if it wanted to include the segment prefix, but as it stands
now the disassembly claims that '26' by itself is fwait, which is certainly
untrue.
$ /usr/local/bin/x86_64-linux-elf-objdump -d -z test.elf
test.elf: file format elf32-i386
Disassembly of section .text:
00008000 <.text>:
8000: 26 fwait
8001: 9b fwait
...
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