https://sourceware.org/bugzilla/show_bug.cgi?id=27266
Bug ID: 27266
Summary: Check for lock prefix with an unlockable instruction
in opcode/i386-dis.c
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: minor
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: lili.cui at intel dot com
Target Milestone: ---
Examples showing the bug
$ cat a.s
.text
#lock prefetchit0 %rcx (illegal).
.byte 0xf0
.byte 0x0f
.byte 0x18
.byte 0x08
$ binary/bin/as a.s -o a.o
$ binary/bin/objdump -dw a.o
a.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: f0 0f 18 08 lock prefetcht0 (%rax)
Since prefetcht0 is an unlockable instruction, I think disassembler should
report "bad" for it.
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