#include <stdio.h>
#include <string.h>
/* plus function machine code, intel instrucation */
unsigned char machine_code[] =
{
0xf3, 0x0f, 0x1e, 0xfa,
0x55,
0x48, 0x89, 0xe5,
0x89, 0x7d, 0xfc,
0x89, 0x75, 0xf8,
0x8b, 0x55, 0xfc,
0x8b, 0x45, 0xf8,
0x01, 0xd0,
0x5d,
0xc3,
};
/*
0000000000001149 <plus>:
1149: f3 0f 1e fa endbr64
114d: 55 push %rbp
114e: 48 89 e5 mov %rsp,%rbp
1151: 89 7d fc mov %edi,-0x4(%rbp)
1154: 89 75 f8 mov %esi,-0x8(%rbp)
1157: 8b 55 fc mov -0x4(%rbp),%edx
115a: 8b 45 f8 mov -0x8(%rbp),%eax
115d: 01 d0 add %edx,%eax
115f: 5d pop %rbp
1160: c3 retq
*/
int plus(int x, int y)
{
return x + y;
}
typedef int (*pfunction)(int x, int y);
int main(int argc, char ** argv)
{
int m = 0;
int z = plus(1, 2);
printf("%d\n", z);
pfunction p = (pfunction)plus;
m = p(4,5);
printf("%d\n", m);
printf("%p\n", machine_code); /* output address, debug */
p = (pfunction)&machine_code;
printf("%x\n", p(4,5));
return 0;
}
#if 0
/*
* intel
*/
0000000000001149 <plus>:
1149: f3 0f 1e fa endbr64
114d: 55 push %rbp
114e: 48 89 e5 mov %rsp,%rbp
1151: 89 7d fc mov %edi,-0x4(%rbp) // x
1154: 89 75 f8 mov %esi,-0x8(%rbp) // y
1157: 8b 55 fc mov -0x4(%rbp),%edx // edx=x
115a: 8b 45 f8 mov -0x8(%rbp),%eax // eax=y
115d: 01 d0 add %edx,%eax // eax=x+y
115f: 5d pop %rbp
1160: c3 retq
0000000000001161 <main>:
1161: f3 0f 1e fa endbr64
1165: 55 push %rbp
1166: 48 89 e5 mov %rsp,%rbp
1169: 48 83 ec 20 sub $0x20,%rsp
116d: 89 7d ec mov %edi,-0x14(%rbp) // (rbp-0x14)=argc
1170: 48 89 75 e0 mov %rsi,-0x20(%rbp) // (rbp-0x20)=argv
1174: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%rbp) // (rbp-0x10)=0
117b: be 02 00 00 00 mov $0x2,%esi // esi=2
1180: bf 01 00 00 00 mov $0x1,%edi // edi=1
1185: e8 bf ff ff ff callq 1149 <plus> // plus(1, 2)
118a: 89 45 f4 mov %eax,-0xc(%rbp) // (rbp-0xc)=plus(1,2)
118d: 8b 45 f4 mov -0xc(%rbp),%eax // eax=plus(1,2)
1190: 89 c6 mov %eax,%esi // esi=eax
1192: 48 8d 3d 6b 0e 00 00 lea 0xe6b(%rip),%rdi # 2004 <_IO_stdin_used+0x4> // rdi="%d\n"
1199: b8 00 00 00 00 mov $0x0,%eax
119e: e8 ad fe ff ff callq 1050 <printf@plt> // printf(rdi, esi)
11a3: 48 8d 05 9f ff ff ff lea -0x61(%rip),%rax # 1149 <plus> // rax=plus's address=0x1149
11aa: 48 89 45 f8 mov %rax,-0x8(%rbp) // rbp-0x8=0x7fffffffe2c8: 0x1149, (rbp-0x8)=0x1149
11ae: 48 8b 45 f8 mov -0x8(%rbp),%rax // rax=0x1149
11b2: be 05 00 00 00 mov $0x5,%esi // esi=5
11b7: bf 04 00 00 00 mov $0x4,%edi // edi=4
11bc: ff d0 callq *%rax // rax=0x1149(4, 5), *为过程调用
11be: 89 45 f0 mov %eax,-0x10(%rbp) // (rbp-0x10)=plus(4,5)
11c1: 8b 45 f0 mov -0x10(%rbp),%eax // eax=(rbp-0x10)
11c4: 89 c6 mov %eax,%esi // esi=eax
11c6: 48 8d 3d 37 0e 00 00 lea 0xe37(%rip),%rdi # 2004 <_IO_stdin_used+0x4> // rdi="%d\n"
11cd: b8 00 00 00 00 mov $0x0,%eax
11d2: e8 79 fe ff ff callq 1050 <printf@plt> // printf(rdi, esi)
11d7: 48 8d 35 32 2e 00 00 lea 0x2e32(%rip),%rsi # 4010 <machine_code> // rsi=0x4010
11de: 48 8d 3d 23 0e 00 00 lea 0xe23(%rip),%rdi # 2008 <_IO_stdin_used+0x8> // rdi="%p\n"
11e5: b8 00 00 00 00 mov $0x0,%eax
11ea: e8 61 fe ff ff callq 1050 <printf@plt> // printf(rdi, rsi)
11ef: 48 8d 05 1a 2e 00 00 lea 0x2e1a(%rip),%rax # 4010 <machine_code> // rax=0x4010
11f6: 48 89 45 f8 mov %rax,-0x8(%rbp) // (rbp-0x8)=0x4010
11fa: 48 8b 45 f8 mov -0x8(%rbp),%rax // rax=0x4010
11fe: be 05 00 00 00 mov $0x5,%esi // esi=5
1203: bf 04 00 00 00 mov $0x4,%edi // edi=4
1208: ff d0 callq *%rax // rax=0x4010(4, 5)
120a: 89 c6 mov %eax,%esi
120c: 48 8d 3d f9 0d 00 00 lea 0xdf9(%rip),%rdi # 200c <_IO_stdin_used+0xc>
1213: b8 00 00 00 00 mov $0x0,%eax
1218: e8 33 fe ff ff callq 1050 <printf@plt>
121d: b8 00 00 00 00 mov $0x0,%eax
1222: c9 leaveq
1223: c3 retq
1224: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
122b: 00 00 00
122e: 66 90 xchg %ax,%ax
/*
* arm
*/
000000000040055c <plus>:
40055c: d10043ff sub sp, sp, #0x10
400560: b9000fe0 str w0, [sp, #12] // w0=1
400564: b9000be1 str w1, [sp, #8] // w1=2
400568: b9400fe1 ldr w1, [sp, #12]
40056c: b9400be0 ldr w0, [sp, #8]
400570: 0b000020 add w0, w1, w0 // w0=w0+w1
400574: 910043ff add sp, sp, #0x10
400578: d65f03c0 ret
000000000040057c <main>:
40057c: a9bd7bfd stp x29, x30, [sp, #-48]!
400580: 910003fd mov x29, sp
400584: b9001fa0 str w0, [x29, #28]
400588: f9000ba1 str x1, [x29, #16]
40058c: b9002fbf str wzr, [x29, #44]
400590: 52800041 mov w1, #0x2 // #2
400594: 52800020 mov w0, #0x1 // #1
400598: 97fffff1 bl 40055c <plus>
40059c: b9002ba0 str w0, [x29, #40] // [x29+40]=plus(1,2)
4005a0: 90000000 adrp x0, 400000 <_init-0x3e8>
4005a4: 911b8000 add x0, x0, #0x6e0
4005a8: b9402ba1 ldr w1, [x29, #40]
4005ac: 97ffffa9 bl 400450 <printf@plt> // printf
4005b0: 90000000 adrp x0, 400000 <_init-0x3e8>
4005b4: 91157000 add x0, x0, #0x55c // x0=plus's address=0x40055c
4005b8: f90013a0 str x0, [x29, #32]
4005bc: f94013a2 ldr x2, [x29, #32] // x2=0x40055c
4005c0: 528000a1 mov w1, #0x5 // #5
4005c4: 52800080 mov w0, #0x4 // #4
4005c8: d63f0040 blr x2 // 0x40055c(4,5)
4005cc: b9002fa0 str w0, [x29, #44] // [x29+44]=0x40055c(4,5)
4005d0: 90000000 adrp x0, 400000 <_init-0x3e8>
4005d4: 911b8000 add x0, x0, #0x6e0
4005d8: b9402fa1 ldr w1, [x29, #44]
4005dc: 97ffff9d bl 400450 <printf@plt> // printf
4005e0: b0000080 adrp x0, 411000 <__libc_start_main@GLIBC_2.17>
4005e4: 9100c001 add x1, x0, #0x30 // x1=0x411030=machine_code's address
4005e8: 90000000 adrp x0, 400000 <_init-0x3e8>
4005ec: 911ba000 add x0, x0, #0x6e8 // x0="%p\n"
4005f0: 97ffff98 bl 400450 <printf@plt> // printf(x0, x1)
4005f4: b0000080 adrp x0, 411000 <__libc_start_main@GLIBC_2.17>
4005f8: 9100c000 add x0, x0, #0x30 // x0=0x411030=machine_code's address
4005fc: f90013a0 str x0, [x29, #32]
400600: f94013a2 ldr x2, [x29, #32] // x2=0x411030=machine_code's address
400604: 528000a1 mov w1, #0x5 // #5
400608: 52800080 mov w0, #0x4 // #4
40060c: d63f0040 blr x2 // 0x411030(4,5)
400610: 2a0003e1 mov w1, w0
400614: 90000000 adrp x0, 400000 <_init-0x3e8>
400618: 911bc000 add x0, x0, #0x6f0
40061c: 97ffff8d bl 400450 <printf@plt>
400620: 52800000 mov w0, #0x0 // #0
400624: a8c37bfd ldp x29, x30, [sp], #48
400628: d65f03c0 ret
40062c: 00000000 .inst 0x00000000 ; undefined
#endif