Mercurial > pub > dyncall > dyncall
view doc/disas_examples/x64.sysv.disas @ 327:c0390dc85a07
- doc: added disassembly examples for many platforms and calling conventions, for reference
| author | Tassilo Philipp |
|---|---|
| date | Fri, 22 Nov 2019 23:08:59 +0100 |
| parents | |
| children | fb51dc714566 |
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line source
; #include <stdlib.h> ; ; void leaf_call(int b, int c, int d, int e, int f, int g, int h) ; { ; } ; ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h) ; { ; /* use some local data */ ; *(char*)alloca(10) = 'L'; ; leaf_call(b, c, d, e, f, g, h); ; } ; ; int main() ; { ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7); ; return 0; ; } ; output from freebsd-12.0-x64 w/ clang 6.0.1 0000000000000000 <leaf_call>: 0: 55 push %rbp 1: 48 89 e5 mov %rsp,%rbp 4: 8b 45 10 mov 0x10(%rbp),%eax 7: 89 7d fc mov %edi,-0x4(%rbp) a: 89 75 f8 mov %esi,-0x8(%rbp) d: 89 55 f4 mov %edx,-0xc(%rbp) 10: 89 4d f0 mov %ecx,-0x10(%rbp) 13: 44 89 45 ec mov %r8d,-0x14(%rbp) 17: 44 89 4d e8 mov %r9d,-0x18(%rbp) 1b: 89 45 e4 mov %eax,-0x1c(%rbp) 1e: 5d pop %rbp 1f: c3 retq 0000000000000020 <nonleaf_call>: 20: 55 push %rbp ; | 21: 48 89 e5 mov %rsp,%rbp ; | prolog 24: 48 83 ec 40 sub $0x40,%rsp ; | open frame *with* static alloca() size included 28: 8b 45 18 mov 0x18(%rbp),%eax ; unsure... get stack param from prev frame into some scratch reg... but why? see below @@@ 2b: 44 8b 55 10 mov 0x10(%rbp),%r10d ; unsure... get stack param from prev frame into some scratch reg... but why? see below @@@ 2f: 89 7d fc mov %edi,-0x4(%rbp) ; in arg 0 -> local area (as temp store) 32: 89 75 f8 mov %esi,-0x8(%rbp) ; in arg 1 -> local area (as temp store) 35: 89 55 f4 mov %edx,-0xc(%rbp) ; in arg 2 -> local area (as temp store) 38: 89 4d f0 mov %ecx,-0x10(%rbp) ; in arg 3 -> local area (as temp store) 3b: 44 89 45 ec mov %r8d,-0x14(%rbp) ; in arg 4 -> local area (as temp store) 3f: 44 89 4d e8 mov %r9d,-0x18(%rbp) ; in arg 5 -> local area (as temp store) 43: c6 45 d0 4c movb $0x4c,-0x30(%rbp) ; 'L' -> local area (of alloca()'d space) 47: 8b 7d f8 mov -0x8(%rbp),%edi ; arg 0 4a: 8b 75 f4 mov -0xc(%rbp),%esi ; arg 1 4d: 8b 55 f0 mov -0x10(%rbp),%edx ; arg 2 50: 8b 4d ec mov -0x14(%rbp),%ecx ; arg 3 53: 44 8b 45 e8 mov -0x18(%rbp),%r8d ; arg 4 57: 44 8b 4d 10 mov 0x10(%rbp),%r9d ; arg 5 (fetched from prev frame's param area - behind return addr on 16b aligned stack) 5b: 44 8b 5d 18 mov 0x18(%rbp),%r11d ; arg 6 (fetched from prev frame's param area), and ... 5f: 44 89 1c 24 mov %r11d,(%rsp) ; ... "pushed" onto stack 63: 44 89 55 cc mov %r10d,-0x34(%rbp) ; unsure... write something to local area @@@? 67: 89 45 c8 mov %eax,-0x38(%rbp) ; unsure... write something to local area @@@? 6a: e8 91 ff ff ff callq 0 <leaf_call> ; push return addr and call 6f: 48 83 c4 40 add $0x40,%rsp ; | 73: 5d pop %rbp ; | epilog 74: c3 retq ; | 75: 66 66 2e 0f 1f 84 00 nopw %cs:0x0(%rax,%rax,1) ; garbage data 7c: 00 00 00 00 ; garbage data 0000000000000080 <main>: 80: 55 push %rbp ; | 81: 48 89 e5 mov %rsp,%rbp ; | prolog 84: 48 83 ec 20 sub $0x20,%rsp ; | 88: 31 ff xor %edi,%edi ; arg 0 8a: be 01 00 00 00 mov $0x1,%esi ; arg 1 8f: ba 02 00 00 00 mov $0x2,%edx ; arg 2 94: b9 03 00 00 00 mov $0x3,%ecx ; arg 3 99: 41 b8 04 00 00 00 mov $0x4,%r8d ; arg 4 9f: 41 b9 05 00 00 00 mov $0x5,%r9d ; arg 5 a5: b8 06 00 00 00 mov $0x6,%eax ; unsure... see below @@@? aa: 41 ba 07 00 00 00 mov $0x7,%r10d ; unsure... see below @@@? b0: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%rbp) ; unsure... write 0 to local area @@@? b7: c7 04 24 06 00 00 00 movl $0x6,(%rsp) ; "push" arg6 onto stack be: c7 44 24 08 07 00 00 00 movl $0x7,0x8(%rsp) ; "push" arg7 onto stack c6: 44 89 55 f8 mov %r10d,-0x8(%rbp) ; unsure... write something to local area @@@? ca: 89 45 f4 mov %eax,-0xc(%rbp) ; unsure... write something to local area @@@? cd: e8 4e ff ff ff callq 20 <nonleaf_call> ; push return addr and call d2: 31 c0 xor %eax,%eax ; return value d4: 48 83 c4 20 add $0x20,%rsp ; | d8: 5d pop %rbp ; | epilog d9: c3 retq ; | ; output from arch_linux-2011.08.19-x64 w/ gcc 4.6.1 (w/ alloca(220) instead of 10) 0000000000000000 <leaf_call>: 0: 55 push %rbp 1: 48 89 e5 mov %rsp,%rbp 4: 89 7d fc mov %edi,-0x4(%rbp) 7: 89 75 f8 mov %esi,-0x8(%rbp) a: 89 55 f4 mov %edx,-0xc(%rbp) d: 89 4d f0 mov %ecx,-0x10(%rbp) 10: 44 89 45 ec mov %r8d,-0x14(%rbp) 14: 44 89 4d e8 mov %r9d,-0x18(%rbp) 18: 5d pop %rbp 19: c3 retq 000000000000001a <nonleaf_call>: 1a: 55 push %rbp 1b: 48 89 e5 mov %rsp,%rbp 1e: 48 83 ec 30 sub $0x30,%rsp 22: 89 7d fc mov %edi,-0x4(%rbp) 25: 89 75 f8 mov %esi,-0x8(%rbp) 28: 89 55 f4 mov %edx,-0xc(%rbp) 2b: 89 4d f0 mov %ecx,-0x10(%rbp) 2e: 44 89 45 ec mov %r8d,-0x14(%rbp) 32: 44 89 4d e8 mov %r9d,-0x18(%rbp) 36: b8 10 00 00 00 mov $0x10,%eax 3b: 48 83 e8 01 sub $0x1,%rax 3f: 48 05 eb 00 00 00 add $0xeb,%rax 45: 48 c7 45 e0 10 00 00 00 movq $0x10,-0x20(%rbp) 4d: ba 00 00 00 00 mov $0x0,%edx 52: 48 f7 75 e0 divq -0x20(%rbp) 56: 48 6b c0 10 imul $0x10,%rax,%rax 5a: 48 29 c4 sub %rax,%rsp 5d: 48 8d 44 24 08 lea 0x8(%rsp),%rax 62: 48 83 c0 0f add $0xf,%rax 66: 48 c1 e8 04 shr $0x4,%rax 6a: 48 c1 e0 04 shl $0x4,%rax 6e: c6 00 4c movb $0x4c,(%rax) 71: 44 8b 45 e8 mov -0x18(%rbp),%r8d 75: 8b 4d ec mov -0x14(%rbp),%ecx 78: 8b 55 f0 mov -0x10(%rbp),%edx 7b: 8b 75 f4 mov -0xc(%rbp),%esi 7e: 8b 45 f8 mov -0x8(%rbp),%eax 81: 8b 7d 18 mov 0x18(%rbp),%edi 84: 89 3c 24 mov %edi,(%rsp) 87: 44 8b 4d 10 mov 0x10(%rbp),%r9d 8b: 89 c7 mov %eax,%edi 8d: e8 00 00 00 00 callq 92 <nonleaf_call+0x78> 92: c9 leaveq 93: c3 retq 0000000000000094 <main>: 94: 55 push %rbp 95: 48 89 e5 mov %rsp,%rbp 98: 48 83 ec 10 sub $0x10,%rsp 9c: c7 44 24 08 07 00 00 00 movl $0x7,0x8(%rsp) a4: c7 04 24 06 00 00 00 movl $0x6,(%rsp) ab: 41 b9 05 00 00 00 mov $0x5,%r9d b1: 41 b8 04 00 00 00 mov $0x4,%r8d b7: b9 03 00 00 00 mov $0x3,%ecx bc: ba 02 00 00 00 mov $0x2,%edx c1: be 01 00 00 00 mov $0x1,%esi c6: bf 00 00 00 00 mov $0x0,%edi cb: e8 00 00 00 00 callq d0 <main+0x3c> d0: b8 00 00 00 00 mov $0x0,%eax d5: c9 leaveq d6: c3 retq ; vim: ft=asm