https://sourceware.org/bugzilla/show_bug.cgi?id=26305
Bug ID: 26305
Summary: {disp32} doesn't work with (%ebp) nor 16-bit mode
Product: binutils
Version: 2.35
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,x86-64
[hjl@gnu-cfl-2 testsuite]$ cat x.s
addl $1, (%ebp)
{disp32} addl $1, (%ebp)
[hjl@gnu-cfl-2 testsuite]$ gcc -c -m32 x.s
[hjl@gnu-cfl-2 testsuite]$ objdump -dw x.o
x.o: file format elf32-i386
Disassembly of section .text:
00000000 <.text>:
0: 83 45 00 01 addl $0x1,0x0(%ebp)
4: 83 45 00 01 addl $0x1,0x0(%ebp)
[hjl@gnu-cfl-2 testsuite]$ cat z.s
.code32
addb $1, (%bx)
{disp32} addb $1, (%bx)
addb $1, (%bp)
{disp32} addb $1, (%bp)
[hjl@gnu-cfl-2 testsuite]$ gcc -c -m32 z.s
[hjl@gnu-cfl-2 testsuite]$ objdump -dw z.o
z.o: file format elf32-i386
Disassembly of section .text:
00000000 <.text>:
0: 67 80 07 01 addb $0x1,(%bx)
4: 67 80 07 01 addb $0x1,(%bx)
8: 67 80 46 00 01 addb $0x1,0x0(%bp)
d: 67 80 46 00 01 addb $0x1,0x0(%bp)
[hjl@gnu-cfl-2 testsuite]$
The problem are
1. (%ebp) is encoded as 0(%ebp) and 0 is always encoded with disp8.
2. {%disp32} is ignored in 16-bit mode.
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