https://sourceware.org/bugzilla/show_bug.cgi?id=29822
Bug ID: 29822
Summary: objdump no longer prints right mnemonic for prefix 3E
Product: binutils
Version: 2.39
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: jengelh at inai dot de
Target Milestone: ---
objdump changed the mnemonic output for prefix 3E.
By my reading of the Intel manual,
"""In 64-bit mode, only FS and GS segment-overrides are applicable in this
situation. Other segment override prefixes (CS, DS, ES and SS) are ignored."""
DS-override is still a thing on IA-32.
== Observed ==
$ cat x.s
cs jmp *%eax;
ds jmp *%eax;
$ as --32 -v x.s -o x.o
GNU assembler version 2.39.0 (x86_64-suse-linux) using BFD version (GNU
Binutils; openSUSE Tumbleweed) 2.39.0.20220810-1
$ objdump -d x.o
x.o: file format elf32-i386
Disassembly of section .text:
00000000 <.text>:
0: 2e ff e0 cs jmp *%eax
3: 3e ff e0 notrack jmp *%eax
== Expected to see ==
$ as --32 -v x.s -o x.o
GNU assembler version 2.26.1 (x86_64-suse-linux) using BFD version (GNU
Binutils; openSUSE Leap 42.3) 2.26.1
$ objdump -d x.o
x.o: file format elf32-i386
Disassembly of section .text:
00000000 <.text>:
0: 2e ff e0 cs jmp *%eax
3: 3e ff e0 ds jmp *%eax
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