Having some trouble unwinding when I'm broken inside of a CRT function.
Another caveat is that I don't have symbols for this CRT function. So the
problem could be anything from something I've done wrong on my side, to an
issue when symbols aren't present, to something else. Here is the source
code of this program:
#include <stdio.h>
int main (void)
{
printf("This is line 1\n");
printf("This is line 2\n");
printf("This is line 3\n");
return 1;
}
Here is the disassembly of main:
(lldb) disassemble -n main -F intel
0x1235040 <main>: push ebp
0x1235041 <main+1>: mov ebp, esp
0x1235043 <main+3>: sub esp, 0x14
0x1235046 <main+6>: lea eax, [0x1230040]
0x123504c <main+12>: mov dword ptr [ebp - 0x4], 0x0
0x1235053 <main+19>: mov dword ptr [esp], eax
0x1235056 <main+22>: call 0x12350a1
0x123505b <main+27>: lea ecx, [0x1230050]
(snipped for brevity)
(Using the argument to "call" as the breakpoint address)
(lldb) break set -a 0x12350a1
Breakpoint 3: address = 0x012350a1
(lldb) run
Process 17044 launching
(lldb) Process 17044 launched: 'd:\testexe\expr_test.exe' (i386)
(lldb) Process 17044 stopped
* thread #1: tid = 0x40ec, 0x012350a1 expr_test.exe, stop reason =
breakpoint 3.1
frame #0: 0x012350a1 expr_test.exe
-> 0x12350a1: pushl $0xc
0x12350a3: pushl $0x1241000
0x12350a8: calll 0x1235be0
0x12350ad: xorl %edi, %edi
(lldb) disassemble -b -F intel
-> 0x12350a1: 6a 0c push 0xc
0x12350a3: 68 00 10 24 01 push 0x1241000
0x12350a8: e8 33 0b 00 00 call 0x1235be0
0x12350ad: 33 ff xor edi, edi
0x12350af: 89 7d e4 mov dword ptr [ebp - 0x1c], edi
0x12350b2: 33 c0 xor eax, eax
0x12350b4: 39 45 08 cmp dword ptr [ebp + 0x8], eax
0x12350b7: 0f 95 c0 setne al
0x12350ba: 85 c0 test eax, eax
0x12350bc: 75 15 jne 0x12350d3
Here's my register values:
(lldb) register read
General Purpose Registers:
eax = 0x01230040
ebx = 0x00000000
ecx = 0x00000001
edx = 0x00000000
edi = 0x00000000
esi = 0x00000000
ebp = 0x00EAF920
esp = 0x00EAF908
eip = 0x012350A1
eflags = 0b00000000000000000000001000010110
And using the value of esp to dump the stack (sorry, I don't know how to
use the -f argument to format this more nicely),
(lldb) memory read 0x00EAF908
0x00eaf908: 5b 50 23 01 40 00 23 01 00 00 00 00 00 00 00 00
[P#.@.#.........
0x00eaf918: 28 f9 ea 00 00 00 00 00 68 f9 ea 00 4e 52 23 01
(.......h...NR#.
So the return address is 0x0123505b. Cross-referencing this with the
original disassembly of main(), it looks like this is the correct value.
So it seems like the Unwinder has all the information it needs, but yet I'm
still only getting 1 frame. Any suggestions how to dig into this?
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