标签：assembly undefined int sp C语言 inst w0 x0 ARM
（1）
static int x;
//static int y = 10;
//int z;
//int w = 20;
int main()
{
int s = 200;
x = 100;
s=s+x;
// s=s+y;
// z=100;
// s=s+z;
// s=s+w;
return 0;
}
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-objdump -D main.o
main.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d10043ff sub sp, sp, #0x10
4: 52801900 mov w0, #0xc8 // #200
8: b9000fe0 str w0, [sp,#12]
c: 90000000 adrp x0, 0 <main>
10: 91000000 add x0, x0, #0x0
14: 52800c81 mov w1, #0x64 // #100
18: b9000001 str w1, [x0]
1c: 90000000 adrp x0, 0 <main>
20: 91000000 add x0, x0, #0x0
24: b9400000 ldr w0, [x0]
28: b9400fe1 ldr w1, [sp,#12]
2c: 0b000020 add w0, w1, w0
30: b9000fe0 str w0, [sp,#12]
34: 52800000 mov w0, #0x0 // #0
38: 910043ff add sp, sp, #0x10
3c: d65f03c0 ret
Disassembly of section .bss:
0000000000000000 <x>:
0: 00000000 .word 0x00000000
Disassembly of section .comment:
0000000000000000 <.comment>:
0: 43434700 .inst 0x43434700 ; undefined
4: 4728203a .inst 0x4728203a ; undefined
8: 2029554e .inst 0x2029554e ; undefined
c: 2e392e34 uqsub v20.8b, v17.8b, v25.8b
10: 30322078 adr x24, 6441d <main+0x6441d>
14: 31303531 adds w17, w9, #0xc0d
18: 28203332 stnp w18, w12, [x25,#-256]
1c: 72657270 .inst 0x72657270 ; undefined
20: 61656c65 .inst 0x61656c65 ; undefined
24: 00296573 .inst 0x00296573 ; NYI
（2）
//static int x;
static int y = 10;
//int z;
//int w = 20;
int main()
{
int s = 200;
// x = 100;
// s=s+x;
s=s+y;
// z=100;
// s=s+z;
// s=s+w;
return 0;
}
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-objdump -D main.o
main.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d10043ff sub sp, sp, #0x10
4: 52801900 mov w0, #0xc8 // #200
8: b9000fe0 str w0, [sp,#12]
c: 90000000 adrp x0, 0 <main>
10: 91000000 add x0, x0, #0x0
14: b9400000 ldr w0, [x0]
18: b9400fe1 ldr w1, [sp,#12]
1c: 0b000020 add w0, w1, w0
20: b9000fe0 str w0, [sp,#12]
24: 52800000 mov w0, #0x0 // #0
28: 910043ff add sp, sp, #0x10
2c: d65f03c0 ret
Disassembly of section .data:
0000000000000000 <y>:
0: 0000000a .word 0x0000000a
Disassembly of section .comment:
0000000000000000 <.comment>:
0: 43434700 .inst 0x43434700 ; undefined
4: 4728203a .inst 0x4728203a ; undefined
8: 2029554e .inst 0x2029554e ; undefined
c: 2e392e34 uqsub v20.8b, v17.8b, v25.8b
10: 30322078 adr x24, 6441d <main+0x6441d>
14: 31303531 adds w17, w9, #0xc0d
18: 28203332 stnp w18, w12, [x25,#-256]
1c: 72657270 .inst 0x72657270 ; undefined
20: 61656c65 .inst 0x61656c65 ; undefined
24: 00296573 .inst 0x00296573 ; NYI
（3）、
//static int x;
//static int y = 10;
int z;
//int w = 20;
int main()
{
int s = 200;
// x = 100;
// s=s+x;
// s=s+y;
z=100;
s=s+z;
// s=s+w;
return 0;
}
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-objdump -D main.o
main.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d10043ff sub sp, sp, #0x10
4: 52801900 mov w0, #0xc8 // #200
8: b9000fe0 str w0, [sp,#12]
c: 90000000 adrp x0, 4 <main+0x4>
10: f9400000 ldr x0, [x0]
14: 52800c81 mov w1, #0x64 // #100
18: b9000001 str w1, [x0]
1c: 90000000 adrp x0, 4 <main+0x4>
20: f9400000 ldr x0, [x0]
24: b9400000 ldr w0, [x0]
28: b9400fe1 ldr w1, [sp,#12]
2c: 0b000020 add w0, w1, w0
30: b9000fe0 str w0, [sp,#12]
34: 52800000 mov w0, #0x0 // #0
38: 910043ff add sp, sp, #0x10
3c: d65f03c0 ret
Disassembly of section .comment:
0000000000000000 <.comment>:
0: 43434700 .inst 0x43434700 ; undefined
4: 4728203a .inst 0x4728203a ; undefined
8: 2029554e .inst 0x2029554e ; undefined
c: 2e392e34 uqsub v20.8b, v17.8b, v25.8b
10: 30322078 adr x24, 6441d <main+0x6441d>
14: 31303531 adds w17, w9, #0xc0d
18: 28203332 stnp w18, w12, [x25,#-256]
1c: 72657270 .inst 0x72657270 ; undefined
20: 61656c65 .inst 0x61656c65 ; undefined
24: 00296573 .inst 0x00296573 ; NYI
（4）、
//static int x;
//static int y = 10;
//int z;
int w = 20;
int main()
{
int s = 200;
// x = 100;
// s=s+x;
// s=s+y;
// z=100;
// s=s+z;
s=s+w;
return 0;
}
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-gcc-4.9 -c main.c
Android GCC has been deprecated in favor of Clang, and will be removed from
Android in 2020-01 as per the deprecation plan in:
https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/master/GCC_4_9_DEPRECATION.md
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-objdump -D main.o
main.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d10043ff sub sp, sp, #0x10
4: 52801900 mov w0, #0xc8 // #200
8: b9000fe0 str w0, [sp,#12]
c: 90000000 adrp x0, 0 <main>
10: f9400000 ldr x0, [x0]
14: b9400000 ldr w0, [x0]
18: b9400fe1 ldr w1, [sp,#12]
1c: 0b000020 add w0, w1, w0
20: b9000fe0 str w0, [sp,#12]
24: 52800000 mov w0, #0x0 // #0
28: 910043ff add sp, sp, #0x10
2c: d65f03c0 ret
Disassembly of section .data:
0000000000000000 <w>:
0: 00000014 .word 0x00000014
Disassembly of section .comment:
0000000000000000 <.comment>:
0: 43434700 .inst 0x43434700 ; undefined
4: 4728203a .inst 0x4728203a ; undefined
8: 2029554e .inst 0x2029554e ; undefined
c: 2e392e34 uqsub v20.8b, v17.8b, v25.8b
10: 30322078 adr x24, 6441d <main+0x6441d>
14: 31303531 adds w17, w9, #0xc0d
18: 28203332 stnp w18, w12, [x25,#-256]
1c: 72657270 .inst 0x72657270 ; undefined
20: 61656c65 .inst 0x61656c65 ; undefined
24: 00296573 .inst 0x00296573 ; NYI
（5）
static int x;
static int y = 10;
int z;
int w = 20;
int main()
{
int s = 200;
x = 100;
s=s+x;
s=s+y;
z=100;
s=s+z;
s=s+w;
return 0;
}
hehezhou@buildsrv-165:~/workspace/test/test1$ aarch64-linux-android-objdump -D main.o
main.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d10043ff sub sp, sp, #0x10
4: 52801900 mov w0, #0xc8 // #200
8: b9000fe0 str w0, [sp,#12]
c: 90000000 adrp x0, 0 <main>
10: 91000000 add x0, x0, #0x0
14: 52800c81 mov w1, #0x64 // #100
18: b9000001 str w1, [x0]
1c: 90000000 adrp x0, 0 <main>
20: 91000000 add x0, x0, #0x0
24: b9400000 ldr w0, [x0]
28: b9400fe1 ldr w1, [sp,#12]
2c: 0b000020 add w0, w1, w0
30: b9000fe0 str w0, [sp,#12]
34: 90000000 adrp x0, 0 <main>
38: 91000000 add x0, x0, #0x0
3c: b9400000 ldr w0, [x0]
40: b9400fe1 ldr w1, [sp,#12]
44: 0b000020 add w0, w1, w0
48: b9000fe0 str w0, [sp,#12]
4c: 90000000 adrp x0, 4 <main+0x4>
50: f9400000 ldr x0, [x0]
54: 52800c81 mov w1, #0x64 // #100
58: b9000001 str w1, [x0]
5c: 90000000 adrp x0, 4 <main+0x4>
60: f9400000 ldr x0, [x0]
64: b9400000 ldr w0, [x0]
68: b9400fe1 ldr w1, [sp,#12]
6c: 0b000020 add w0, w1, w0
70: b9000fe0 str w0, [sp,#12]
74: 90000000 adrp x0, 4 <main+0x4>
78: f9400000 ldr x0, [x0]
7c: b9400000 ldr w0, [x0]
80: b9400fe1 ldr w1, [sp,#12]
84: 0b000020 add w0, w1, w0
88: b9000fe0 str w0, [sp,#12]
8c: 52800000 mov w0, #0x0 // #0
90: 910043ff add sp, sp, #0x10
94: d65f03c0 ret
Disassembly of section .data:
0000000000000000 <y>:
0: 0000000a .word 0x0000000a
0000000000000004 <w>:
4: 00000014 .word 0x00000014
Disassembly of section .bss:
0000000000000000 <x>:
0: 00000000 .word 0x00000000
Disassembly of section .comment:
0000000000000000 <.comment>:
0: 43434700 .inst 0x43434700 ; undefined
4: 4728203a .inst 0x4728203a ; undefined
8: 2029554e .inst 0x2029554e ; undefined
c: 2e392e34 uqsub v20.8b, v17.8b, v25.8b
10: 30322078 adr x24, 6441d <w+0x64419>
14: 31303531 adds w17, w9, #0xc0d
18: 28203332 stnp w18, w12, [x25,#-256]
1c: 72657270 .inst 0x72657270 ; undefined
20: 61656c65 .inst 0x61656c65 ; undefined
24: 00296573 .inst 0x00296573 ; NYI
标签：assembly,undefined,int,sp,C语言,inst,w0,x0,ARM 来源： https://blog.51cto.com/u_15278218/2930976
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。