#include <stdio.h>
int f(int *a, int *b, int *c)
{
printf("%d %d %d\n", *a, *b, *c); // 1 2 3
*a = 7;
*b = 8;
*c = 9;
printf("%d %d %d\n", *a, *b, *c); // 7 8 9
return 0;
}
int main()
{
int a = 1, b = 2, c = 3;
printf("%d %d %d\n", a, b, c); // 1 2 3
f(&a, &b, &c);
printf("%d %d %d\n", a, b, c); // 7 8 9
return 0;
}
#if 0
note : 传递地址到函数的基本上都是指针
#endif
#if 0
/*
* intel
*/
0000000000001169 <f>:
1169: f3 0f 1e fa endbr64
116d: 55 push %rbp
116e: 48 89 e5 mov %rsp,%rbp
1171: 48 83 ec 20 sub $0x20,%rsp
1175: 48 89 7d f8 mov %rdi,-0x8(%rbp)
1179: 48 89 75 f0 mov %rsi,-0x10(%rbp)
117d: 48 89 55 e8 mov %rdx,-0x18(%rbp)
1181: 48 8b 45 e8 mov -0x18(%rbp),%rax
1185: 8b 08 mov (%rax),%ecx
1187: 48 8b 45 f0 mov -0x10(%rbp),%rax
118b: 8b 10 mov (%rax),%edx
118d: 48 8b 45 f8 mov -0x8(%rbp),%rax
1191: 8b 00 mov (%rax),%eax
1193: 89 c6 mov %eax,%esi
1195: 48 8d 3d 68 0e 00 00 lea 0xe68(%rip),%rdi # 2004 <_IO_stdin_used+0x4>
119c: b8 00 00 00 00 mov $0x0,%eax
11a1: e8 ca fe ff ff callq 1070 <printf@plt>
11a6: 48 8b 45 f8 mov -0x8(%rbp),%rax
11aa: c7 00 07 00 00 00 movl $0x7,(%rax)
11b0: 48 8b 45 f0 mov -0x10(%rbp),%rax
11b4: c7 00 08 00 00 00 movl $0x8,(%rax)
11ba: 48 8b 45 e8 mov -0x18(%rbp),%rax
11be: c7 00 09 00 00 00 movl $0x9,(%rax)
11c4: 48 8b 45 e8 mov -0x18(%rbp),%rax
11c8: 8b 08 mov (%rax),%ecx
11ca: 48 8b 45 f0 mov -0x10(%rbp),%rax
11ce: 8b 10 mov (%rax),%edx
11d0: 48 8b 45 f8 mov -0x8(%rbp),%rax
11d4: 8b 00 mov (%rax),%eax
11d6: 89 c6 mov %eax,%esi
11d8: 48 8d 3d 25 0e 00 00 lea 0xe25(%rip),%rdi # 2004 <_IO_stdin_used+0x4>
11df: b8 00 00 00 00 mov $0x0,%eax
11e4: e8 87 fe ff ff callq 1070 <printf@plt>
11e9: b8 00 00 00 00 mov $0x0,%eax
11ee: c9 leaveq
11ef: c3 retq
00000000000011f0 <main>:
11f0: f3 0f 1e fa endbr64
11f4: 55 push %rbp
11f5: 48 89 e5 mov %rsp,%rbp
11f8: 48 83 ec 20 sub $0x20,%rsp
11fc: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax
1203: 00 00
1205: 48 89 45 f8 mov %rax,-0x8(%rbp)
1209: 31 c0 xor %eax,%eax
120b: c7 45 ec 01 00 00 00 movl $0x1,-0x14(%rbp)
1212: c7 45 f0 02 00 00 00 movl $0x2,-0x10(%rbp)
1219: c7 45 f4 03 00 00 00 movl $0x3,-0xc(%rbp)
1220: 8b 4d f4 mov -0xc(%rbp),%ecx
1223: 8b 55 f0 mov -0x10(%rbp),%edx
1226: 8b 45 ec mov -0x14(%rbp),%eax
1229: 89 c6 mov %eax,%esi
122b: 48 8d 3d d2 0d 00 00 lea 0xdd2(%rip),%rdi # 2004 <_IO_stdin_used+0x4>
1232: b8 00 00 00 00 mov $0x0,%eax
1237: e8 34 fe ff ff callq 1070 <printf@plt>
123c: 48 8d 55 f4 lea -0xc(%rbp),%rdx
1240: 48 8d 4d f0 lea -0x10(%rbp),%rcx
1244: 48 8d 45 ec lea -0x14(%rbp),%rax
1248: 48 89 ce mov %rcx,%rsi
124b: 48 89 c7 mov %rax,%rdi
124e: e8 16 ff ff ff callq 1169 <f>
1253: 8b 4d f4 mov -0xc(%rbp),%ecx
1256: 8b 55 f0 mov -0x10(%rbp),%edx
1259: 8b 45 ec mov -0x14(%rbp),%eax
125c: 89 c6 mov %eax,%esi
125e: 48 8d 3d 9f 0d 00 00 lea 0xd9f(%rip),%rdi # 2004 <_IO_stdin_used+0x4>
1265: b8 00 00 00 00 mov $0x0,%eax
126a: e8 01 fe ff ff callq 1070 <printf@plt>
126f: b8 00 00 00 00 mov $0x0,%eax
1274: 48 8b 75 f8 mov -0x8(%rbp),%rsi
1278: 64 48 33 34 25 28 00 xor %fs:0x28,%rsi
127f: 00 00
1281: 74 05 je 1288 <main+0x98>
1283: e8 d8 fd ff ff callq 1060 <__stack_chk_fail@plt>
1288: c9 leaveq
1289: c3 retq
128a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
/*
* arm
*/
000000000040055c <f>:
40055c: a9bd7bfd stp x29, x30, [sp, #-48]!
400560: 910003fd mov x29, sp
400564: f90017a0 str x0, [x29, #40]
400568: f90013a1 str x1, [x29, #32]
40056c: f9000fa2 str x2, [x29, #24]
400570: f94017a0 ldr x0, [x29, #40]
400574: b9400001 ldr w1, [x0]
400578: f94013a0 ldr x0, [x29, #32]
40057c: b9400002 ldr w2, [x0]
400580: f9400fa0 ldr x0, [x29, #24]
400584: b9400003 ldr w3, [x0]
400588: 90000000 adrp x0, 400000 <_init-0x3e8>
40058c: 911c2000 add x0, x0, #0x708
400590: 97ffffb0 bl 400450 <printf@plt>
400594: f94017a0 ldr x0, [x29, #40]
400598: 528000e1 mov w1, #0x7 // #7
40059c: b9000001 str w1, [x0]
4005a0: f94013a0 ldr x0, [x29, #32]
4005a4: 52800101 mov w1, #0x8 // #8
4005a8: b9000001 str w1, [x0]
4005ac: f9400fa0 ldr x0, [x29, #24]
4005b0: 52800121 mov w1, #0x9 // #9
4005b4: b9000001 str w1, [x0]
4005b8: f94017a0 ldr x0, [x29, #40]
4005bc: b9400001 ldr w1, [x0]
4005c0: f94013a0 ldr x0, [x29, #32]
4005c4: b9400002 ldr w2, [x0]
4005c8: f9400fa0 ldr x0, [x29, #24]
4005cc: b9400003 ldr w3, [x0]
4005d0: 90000000 adrp x0, 400000 <_init-0x3e8>
4005d4: 911c2000 add x0, x0, #0x708
4005d8: 97ffff9e bl 400450 <printf@plt>
4005dc: 52800000 mov w0, #0x0 // #0
4005e0: a8c37bfd ldp x29, x30, [sp], #48
4005e4: d65f03c0 ret
00000000004005e8 <main>:
4005e8: a9be7bfd stp x29, x30, [sp, #-32]!
4005ec: 910003fd mov x29, sp
4005f0: 52800020 mov w0, #0x1 // #1
4005f4: b9001fa0 str w0, [x29, #28]
4005f8: 52800040 mov w0, #0x2 // #2
4005fc: b9001ba0 str w0, [x29, #24]
400600: 52800060 mov w0, #0x3 // #3
400604: b90017a0 str w0, [x29, #20]
400608: b9401fa1 ldr w1, [x29, #28]
40060c: b9401ba2 ldr w2, [x29, #24]
400610: b94017a3 ldr w3, [x29, #20]
400614: 90000000 adrp x0, 400000 <_init-0x3e8>
400618: 911c2000 add x0, x0, #0x708
40061c: 97ffff8d bl 400450 <printf@plt>
400620: 910053a2 add x2, x29, #0x14
400624: 910063a1 add x1, x29, #0x18
400628: 910073a0 add x0, x29, #0x1c
40062c: 97ffffcc bl 40055c <f>
400630: b9401fa1 ldr w1, [x29, #28]
400634: b9401ba2 ldr w2, [x29, #24]
400638: b94017a3 ldr w3, [x29, #20]
40063c: 90000000 adrp x0, 400000 <_init-0x3e8>
400640: 911c2000 add x0, x0, #0x708
400644: 97ffff83 bl 400450 <printf@plt>
400648: 52800000 mov w0, #0x0 // #0
40064c: a8c27bfd ldp x29, x30, [sp], #32
400650: d65f03c0 ret
400654: 00000000 .inst 0x00000000 ; undefined
#endif