http://sourceware.org/bugzilla/show_bug.cgi?id=13321
Bug #: 13321
Summary: Gold creates mixed Thumb/ARM files that objdump -d
doesn't understand
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: i...@airs.com
ReportedBy: mh-sourcew...@glandium.org
CC: ccout...@google.com
Classification: Unclassified
I haven't looked exactly why this happens but here is the problem:
$ cat <<EOF >test.c
#include <stdio.h>
void foo() {
printf("foo\n");
}
EOF
$ gcc -o test.so -shared test.c -mthumb -fPIC -Os -march=armv7-a
$ objdump -d test.so
test.so: file format elf32-littlearm
Disassembly of section .plt:
000001d0 <.plt>:
1d0: e52de004 .word 0xe52de004
1d4: e59fe004 .word 0xe59fe004
1d8: e08fe00e .word 0xe08fe00e
1dc: e5bef008 .word 0xe5bef008
1e0: 000010c8 .word 0x000010c8
1e4: e28fc600 .word 0xe28fc600
1e8: e28cca01 .word 0xe28cca01
1ec: e5bcf0c8 .word 0xe5bcf0c8
Disassembly of section .text:
000001f0 <foo>:
1f0: 4801 ldr r0, [pc, #4] ; (1f8 <foo+0x8>)
1f2: 4478 add r0, pc
1f4: f000 b802 b.w 1fc <foo+0xc>
1f8: 00000016 .word 0x00000016
1fc: 46c04778 .word 0x46c04778
200: e59fc000 .word 0xe59fc000
204: e08cf00f .word 0xe08cf00f
208: ffffffd8 .word 0xffffffd8
With GNU ld:
$ gcc -o test.so -shared test.c -mthumb -fPIC -Os -march=armv7-a
$ objdump -d test.so
test.so: file format elf32-littlearm
Disassembly of section .plt:
00000260 <.plt>:
260: e52de004 push {lr} ; (str lr, [sp, #-4]!)
264: e59fe004 ldr lr, [pc, #4] ; 270 <foo-0x14>
268: e08fe00e add lr, pc, lr
26c: e5bef008 ldr pc, [lr, #8]!
270: 000080b4 .word 0x000080b4
274: 4778 bx pc
276: 46c0 nop ; (mov r8, r8)
278: e28fc600 add ip, pc, #0
27c: e28cca08 add ip, ip, #32768 ; 0x8000
280: e5bcf0b0 ldr pc, [ip, #176]! ; 0xb0
Disassembly of section .text:
00000284 <foo>:
284: 4801 ldr r0, [pc, #4] ; (28c <foo+0x8>)
286: 4478 add r0, pc
288: f7ff bff4 b.w 274 <foo-0x10>
28c: 00000006 .word 0x00000006
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