The following three-line text case assembles incorrectly:
.intel_syntax noprefix
mov ax, AN_EQU
.equ AN_EQU, 5
Compiled with "gcc -c test.S"
Disassembled with "objdump -M intel -d test.o":
0: 66 8b 04 25 05 00 00 mov ax,WORD PTR ds:0x5
7: 00
For some reason, this assembled as a memory dereference of ds:0x5. Somehow, gas
knew enough to substitute the value 5, but didn't know to treat it as an
immediate.
If I move the equate before the instruction, it assembles correctly:
.intel_syntax noprefix
.equ AN_EQU, 5
mov ax, AN_EQU
0: 66 b8 05 00 mov ax,0x5
If I substitute a literal 5 in the instruction, it assembles correctly:
.intel_syntax noprefix
mov ax, 5
0: 66 b8 05 00 mov ax,0x5
And if I use AT&T syntax, it assembles correctly:
.att_syntax
mov $AN_EQU, %ax
.equ AN_EQU, 5
0: 66 b8 05 00 mov ax,0x5
--
Summary: .intel_syntax misassembles a forward-referenced .equ as
a data reference
Product: binutils
Version: 2.20
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: josh at joshtriplett dot org
CC: bug-binutils at gnu dot org
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=11544
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