Chris Webb <chris@xxxxxxxxxxxx> writes:
> Reading through the disassembled code and comparing by hand against
> disk_part_iter_next(), I think that might be line 144 of block/genhd.c,
> where the ptbl->len dereference happens.
Sorry to follow up a third time, but I can now confirm this. I slipped -g into
CFLAGS in the kernel Makefile and rebuilt genhd.o and then the entire vmlinux.
# objdump -S genhd.o
[...]
0000000000000da3 <disk_part_iter_next>:
*
* CONTEXT:
* Don't care.
*/
struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
{
da3: 55 push %rbp
da4: 48 89 e5 mov %rsp,%rbp
da7: 41 55 push %r13
da9: 41 54 push %r12
dab: 53 push %rbx
dac: 48 89 fb mov %rdi,%rbx
daf: 48 83 ec 08 sub $0x8,%rsp
struct disk_part_tbl *ptbl;
int inc, end;
/* put the last partition */
disk_put_part(piter->part);
db3: 48 8b 7f 08 mov 0x8(%rdi),%rdi
[...]
e01: 48 be ff ff ff ff 08 mov $0x8ffffffff,%rsi
e08: 00 00 00
e0b: 48 b9 00 00 00 00 08 mov $0x800000000,%rcx
e12: 00 00 00
e15: eb 50 jmp e67 <disk_part_iter_next+0xc4>
end = -1;
else
end = 0;
} else {
inc = 1;
end = ptbl->len;
e17: 8b 42 10 mov 0x10(%rdx),%eax
e1a: 41 bd 01 00 00 00 mov $0x1,%r13d
e20: eb db jmp dfd <disk_part_iter_next+0x5a>
[...]
# addr2line -e vmlinux 0xffffffff803f0d77
/tmp/linux-2.6.30.4-p.tmp/block/genhd.c:144
Cheers,
Chris,
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