https://sourceware.org/bugzilla/show_bug.cgi?id=21874
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-08-01
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Assembler just takes anything:
[hjl@gnu-tools-1 pr21874]$ cat x.s
.intel_syntax noprefix
mov eax, DWORD PTR fs:foobar:16
mov eax, DWORD PTR fs:foobar:barfoo:16
mov eax, DWORD PTR fs:ds:16
mov eax, DWORD PTR fs:ds:cs:16
[hjl@gnu-tools-1 pr21874]$ make AS=as
as --32 -o x.o x.s
[hjl@gnu-tools-1 pr21874]$ objdump -dwr x.o
x.o: file format elf32-i386
Disassembly of section .text:
00000000 <.text>:
0: 64 a1 10 00 00 00 mov %fs:0x10,%eax
6: 64 a1 10 00 00 00 mov %fs:0x10,%eax
c: 64 a1 10 00 00 00 mov %fs:0x10,%eax
12: 64 a1 10 00 00 00 mov %fs:0x10,%eax
[hjl@gnu-tools-1 pr21874]$
There is even a test in gas/testsuite/gas/i386/intelok.s:
mov eax, fs:gs:[eax]
for this syntax.
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