https://sourceware.org/bugzilla/show_bug.cgi?id=24821
Bug ID: 24821
Summary: Missing standalone prefix check
Product: binutils
Version: 2.33 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386
Prefixes aren't valid for all instructions:
[hjl@gnu-cfl-1 prefix-4]$ cat y.s
rep repz stosb
rep movups (%rax), %xmm0
bnd movups (%rax), %xmm0
[hjl@gnu-cfl-1 prefix-4]$ make y.o
./as -o y.o y.s
y.s: Assembler messages:
y.s:1: Error: same type of prefix used twice
y.s:2: Error: invalid instruction `movups' after `rep'
y.s:3: Error: expecting valid branch instruction after `bnd'
make: *** [Makefile:17: y.o] Error 1
[hjl@gnu-cfl-1 prefix-4]$
But standalone prefix isn't checked against the instruction which
the prefix is applied on:
[hjl@gnu-cfl-1 prefix-4]$ cat x.s
.text
rep
repz stosb
rep
movups (%rax), %xmm0
bnd
movups (%rax), %xmm0
rep
.pushsection .foo,"ax",@progbits
movups (%rax), %xmm0
.popsection
movups (%rax), %xmm1
bnd
[hjl@gnu-cfl-1 prefix-4]$ ./as -o x.o x.s
[hjl@gnu-cfl-1 prefix-4]$ objdump -dw x.o
x.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: f3 f3 aa repz rep stos %al,%es:(%rdi)
3: f3 0f 10 00 movss (%rax),%xmm0
7: f2 0f 10 00 movsd (%rax),%xmm0
b: f3 0f 10 08 movss (%rax),%xmm1
f: f2 repnz
Disassembly of section .foo:
0000000000000000 <.foo>:
0: 0f 10 00 movups (%rax),%xmm0
[hjl@gnu-cfl-1 prefix-4]$
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