Rob Landley wrote:
On Wednesday 13 July 2005 07:11, Bodo Stroesser wrote:
Rob Landley wrote:
Am I doing it right? Is there anything I can do to help track this down?
Rob
The value of EIP reported in your earlier mail is quite surprising.
Could you please "objdump" vmlinux and send the part of
"stub_segv_handler"?
Bodo
I'm guessing you want objdump -d, and here's stub_segv_handler from that:
081020b0 <stub_segv_handler>:
81020b0: 8b 44 24 5c mov 0x5c(%esp),%eax
81020b4: a3 04 f0 ff bf mov %eax,0xbffff004
81020b9: 8b 44 24 3c mov 0x3c(%esp),%eax
81020bd: a3 00 f0 ff bf mov %eax,0xbffff000
81020c2: 8b 44 24 38 mov 0x38(%esp),%eax
81020c6: a3 08 f0 ff bf mov %eax,0xbffff008
81020cb: b8 14 00 00 00 mov $0x14,%eax
81020d0: cd 80 int $0x80
81020d2: 89 c3 mov %eax,%ebx
81020d4: b8 25 00 00 00 mov $0x25,%eax
81020d9: b9 0a 00 00 00 mov $0xa,%ecx
81020de: cd 80 int $0x80
81020e0: 58 pop %eax
81020e1: 58 pop %eax
81020e2: 58 pop %eax
81020e3: b8 77 00 00 00 mov $0x77,%eax
81020e8: cd 80 int $0x80
81020ea: c3 ret
Rob
Hi Jeff,
stub_segv_handler misses the "push ebp" at the beginning. As you
do the normally corresponding "pop eax" explicitly, I think stack
pointer is wrong on call of sigreturn.
I have no idea, what makes happen this. Maybe it depends on compiler
version?
Bodo
P.S.:
Normally, stub_segv_handler should look like this:
a02090d0 <stub_segv_handler>:
a02090d0: 55 push %ebp
a02090d1: 89 e5 mov %esp,%ebp
a02090d3: 8b 45 60 mov 0x60(%ebp),%eax
a02090d6: a3 04 f0 ff bf mov %eax,0xbffff004
a02090db: 8b 45 40 mov 0x40(%ebp),%eax
a02090de: a3 00 f0 ff bf mov %eax,0xbffff000
a02090e3: 8b 45 3c mov 0x3c(%ebp),%eax
a02090e6: a3 08 f0 ff bf mov %eax,0xbffff008
a02090eb: b8 14 00 00 00 mov $0x14,%eax
a02090f0: cd 80 int $0x80
a02090f2: 89 c3 mov %eax,%ebx
a02090f4: b8 25 00 00 00 mov $0x25,%eax
a02090f9: b9 0a 00 00 00 mov $0xa,%ecx
a02090fe: cd 80 int $0x80
a0209100: 58 pop %eax
a0209101: 58 pop %eax
a0209102: 58 pop %eax
a0209103: b8 77 00 00 00 mov $0x77,%eax
a0209108: cd 80 int $0x80
a020910a: 5d pop %ebp
a020910b: c3 ret
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