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CMU CS 15213 - Recitation

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Recitation 3 Donnie Kim September 25, 2006 15-213 Intro to Comp Systems Bryant, O’Hallaron Stack Frame Structure Fill in the missing part of the stack when the given program just entered foo1(), by examining the attached C source code and assembly code. Assume the two inputs from the user are 2 and 3. 0xffffd4cc 0xffffd4c8 0xffffd4c4 0xffffd4c0 0xffffd4bc 0xffffd4b8 0xffffd4b4 0x00000003 0xffffd4b0 0x00000002 0xffffd4ac 0x08048438 0xffffd4a8 0xffffd4d8 0xffffd4a4 foo2’s frame 0xffffd4a0 0xffffd49c %ebp -> 0xffffd498 foo1’s frame %esp -> 0xffffd494 0xffffd498 0xffffd49c[ C code ] #include <stdio.h> int foo1(int *xp, int *yp) { int x = *xp; int y = *yp; *xp = y; *yp = x; return x + y; } int foo2(int x, int y) { int sum = foo1(&x, &y); int dif = x - y; return dif * sum; } int main(void) { int x, y; int val; scanf("%d %d", &x, &y); val = foo2(x, y); printf("val=%d\n", val); return 0; } [ASM code] 080483b0 <foo1>: 80483b0: 55 push %ebp 80483b1: 89 e5 mov %esp,%ebp 80483b3: 53 push %ebx 80483b4: 8b 4d 08 mov 0x8(%ebp),%ecx 80483b7: 8b 5d 0c mov 0xc(%ebp),%ebx 80483ba: 8b 01 mov (%ecx),%eax 80483bc: 8b 13 mov (%ebx),%edx 80483be: 89 11 mov %edx,(%ecx) 80483c0: 89 03 mov %eax,(%ebx) 80483c2: 01 d0 add %edx,%eax 80483c4: 5b pop %ebx 80483c5: c9 leave 80483c6: c3 ret 80483c7: 89 f6 mov %esi,%esi 80483c9: 8d bc 27 00 00 00 00 lea 0x0(%edi),%edi080483d0 <foo2>: 80483d0: 55 push %ebp 80483d1: 89 e5 mov %esp,%ebp 80483d3: 83 ec 08 sub $0x8,%esp 80483d6: 8d 45 0c lea 0xc(%ebp),%eax 80483d9: 89 44 24 04 mov %eax,0x4(%esp) 80483dd: 8d 45 08 lea 0x8(%ebp),%eax 80483e0: 89 04 24 mov %eax,(%esp) 80483e3: e8 c8 ff ff ff call 80483b0 <foo1> 80483e8: 89 c2 mov %eax,%edx 80483ea: 8b 45 08 mov 0x8(%ebp),%eax 80483ed: 2b 45 0c sub 0xc(%ebp),%eax 80483f0: c9 leave 80483f1: 0f af c2 imul %edx,%eax 80483f4: c3 ret 80483f5: 8d 74 26 00 lea 0x0(%esi),%esi 80483f9: 8d bc 27 00 00 00 00 lea 0x0(%edi),%edi 08048400 <main>: 8048400: 55 push %ebp 8048401: 89 e5 mov %esp,%ebp 8048403: 83 ec 18 sub $0x18,%esp 8048406: 8d 45 fc lea 0xfffffffc(%ebp),%eax 8048409: 83 e4 f0 and $0xfffffff0,%esp 804840c: 83 ec 10 sub $0x10,%esp 804840f: 89 44 24 08 mov %eax,0x8(%esp) 8048413: 8d 45 f8 lea 0xfffffff8(%ebp),%eax 8048416: c7 04 24 3c 85 04 08 movl $0x804853c,(%esp) 804841d: 89 44 24 04 mov %eax,0x4(%esp) 8048421: e8 9e fe ff ff call 80482c4 <scanf@plt> 8048426: 8b 45 fc mov 0xfffffffc(%ebp),%eax 8048429: 89 44 24 04 mov %eax,0x4(%esp) 804842d: 8b 45 f8 mov 0xfffffff8(%ebp),%eax 8048430: 89 04 24 mov %eax,(%esp) 8048433: e8 98 ff ff ff call 80483d0 <foo2> 8048438: c7 04 24 42 85 04 08 movl $0x8048542,(%esp) 804843f: 89 44 24 04 mov %eax,0x4(%esp) 8048443: e8 9c fe ff ff call 80482e4 <printf@plt> 8048448: c9 leave 8048449: 31 c0 xor %eax,%eax 804844b: c3


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