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SubjectBogus objdump output from kernel object files?
On Sun, 12 Feb 2006 at 01:40:46 -0800, Andrew Morton wrote:

> btw, is something up with `make foo.lst'? It hasn't worked for me for
some
> time.
>
> bix:/usr/src/25> make mm/vmscan.lst
> MKLST mm/vmscan.lst

Just doing 'objdump -d -r -l -j .text mm/vmscan.o' gives:

mm/vmscan.o: file format elf32-i386

Disassembly of section .text:

00000000 <shrink_slab>:
kswapd_init():
^^^^^^^^^^^^^^
This is actually at offset 0 in .init.text

mm/vmscan.c:176
0: 55 push %ebp
shrink_slab():
^^^^^^^^^^^^^^
OK, back to the right location.

1: 89 e5 mov %esp,%ebp
3: 57 push %edi
kswapd_init():
mm/vmscan.c:1801
^^^^^^^^^^^^^^^^
Now back to kswapd_init() again?!?!

4: 56 push %esi
5: 89 c6 mov %eax,%esi
include/asm/processor.h:710
7: 53 push %ebx
8: 83 ec 24 sub $0x24,%esp
mm/vmscan.c:180
^^^^^^^^^^^^^^^

b: 85 c0 test %eax,%eax
include/asm/processor.h:710
d: b8 20 00 00 00 mov $0x20,%eax
mm/vmscan.c:176
12: 89 55 e4 mov %edx,0xffffffe4(%ebp)
mm/vmscan.c:180
15: 0f 44 f0 cmove %eax,%esi
include/asm/rwsem.h:126
18: a1 0c 00 00 00 mov 0xc,%eax
19: R_386_32 .data
1d: 89 c2 mov %eax,%edx
1f: 83 c2 01 add $0x1,%edx
mm/vmscan.c:1803
^^^^^^^^^^^^^^^^

22: 7e 09 jle 2d <shrink_slab+0x2d>
24: 0f b1 15 0c 00 00 00 cmpxchg %edx,0xc
27: R_386_32 .data
2b: 75 f0 jne 1d <shrink_slab+0x1d>
mm/vmscan.c:183
2d: 85 c0 test %eax,%eax
2f: c7 45 e8 01 00 00 00 movl $0x1,0xffffffe8(%ebp)
36: 0f 88 2c 01 00 00 js 168 <shrink_slab+0x168>


So it is confused somehow. This is with debug info generated by gcc 4.0.2
from
Fedora Core 4 (Red Hat 4.0.2-8) and locally-compiled objdump 2.16.1 (there
seems to be no binutils update for FC4 available.)
--
Chuck
"Equations are the Devil's sentences." --Stephen Colbert
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