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Breakpoint 1 at 0x80483d7: file maze.c, line 13.
Breakpoint 1, explore (node=0x804a080) at maze.c:13
13 return 1; // found cheese
2: $ebp = (void *) 0xbffff688
1: $esp = (void *) 0xbffff680
Inspect the stack frames:
#0 explore (node=0x804a080) at maze.c:13
#1 0x080483ec in explore (node=0x804a090) at maze.c:16
#2 0x080483ec in explore (node=0x804a0a0) at maze.c:16
#3 0x080483fe in explore (node=0x804a0b0) at maze.c:16
#4 0x080483fe in explore (node=0x804a0c0) at maze.c:16
#5 0x08048428 in main (argc=1) at maze.c:22
Let's see where our mouse has been:
$1 = {hasCheese = 1, tag = 11, left = 0x0, right = 0x0}
$2 = {hasCheese = 0, tag = 10, left = 0x804a080, right = 0x0}
$3 = {hasCheese = 0, tag = 9, left = 0x804a090, right = 0x804a0d8}
$4 = {hasCheese = 0, tag = 7, left = 0x804a070, right = 0x804a0a0}
$5 = {hasCheese = 0, tag = 0, left = 0x804a060, right = 0x804a0b0}
Inspect stack contents as words. These are converted little-endian
from individual bytes into 4-byte numbers:
0xbffff680: 0xbffff890 0x00000000 0xbffff698 0x080483ec
0xbffff690: 0x0804a080 0x00000000 0xbffff6a8 0x080483ec
0xbffff6a0: 0x0804a090 0x00000000 0xbffff6b8 0x080483fe
0xbffff6b0: 0x0804a0a0 0x00000000 0xbffff6c8 0x080483fe
0xbffff6c0: 0x0804a0b0 0x00000000 0xbffff6d8 0x08048428
0xbffff6d0: 0x0804a0c0 0x00000000 0x00000000 0xb7e454d3
0xbffff6e0: 0x00000001
And here is assembly code for main and explore:
Dump of assembler code for function main:
0x08048416 <+0>: push %ebp
0x08048417 <+1>: mov %esp,%ebp
0x08048419 <+3>: sub $0x8,%esp
0x0804841c <+6>: movl $0x804a0c0,(%esp)
0x08048423 <+13>: call 0x80483b4 <explore>
0x08048428 <+18>: mov %eax,-0x4(%ebp)
0x0804842b <+21>: leave
0x0804842c <+22>: ret
End of assembler dump.
Dump of assembler code for function explore:
0x080483b4 <+0>: push %ebp
0x080483b5 <+1>: mov %esp,%ebp
0x080483b7 <+3>: sub $0x8,%esp
0x080483ba <+6>: movl $0x0,-0x4(%ebp)
0x080483c1 <+13>: cmpl $0x0,0x8(%ebp)
0x080483c5 <+17>: jne 0x80483ce <explore+26>
0x080483c7 <+19>: mov $0x0,%eax
0x080483cc <+24>: jmp 0x8048414 <explore+96>
0x080483ce <+26>: mov 0x8(%ebp),%eax
0x080483d1 <+29>: mov (%eax),%eax
0x080483d3 <+31>: test %eax,%eax
0x080483d5 <+33>: je 0x80483de <explore+42>
=> 0x080483d7 <+35>: mov $0x1,%eax
0x080483dc <+40>: jmp 0x8048414 <explore+96>
0x080483de <+42>: mov 0x8(%ebp),%eax
0x080483e1 <+45>: mov 0x8(%eax),%eax
0x080483e4 <+48>: mov %eax,(%esp)
0x080483e7 <+51>: call 0x80483b4 <explore>
0x080483ec <+56>: test %eax,%eax
0x080483ee <+58>: jne 0x8048402 <explore+78>
0x080483f0 <+60>: mov 0x8(%ebp),%eax
0x080483f3 <+63>: mov 0xc(%eax),%eax
0x080483f6 <+66>: mov %eax,(%esp)
0x080483f9 <+69>: call 0x80483b4 <explore>
0x080483fe <+74>: test %eax,%eax
0x08048400 <+76>: je 0x8048409 <explore+85>
0x08048402 <+78>: mov $0x1,%eax
0x08048407 <+83>: jmp 0x804840e <explore+90>
0x08048409 <+85>: mov $0x0,%eax
0x0804840e <+90>: mov %eax,-0x4(%ebp)
0x08048411 <+93>: mov -0x4(%ebp),%eax
0x08048414 <+96>: leave
0x08048415 <+97>: ret
End of assembler dump.