2017-2018-1 20155318 《信息安全系统设计基础》第八周课下作业
2017-2018-1 20155318 《信息安全系统设计基础》第八周课下作业
作业一
- 完成家庭作业4.47，4.48，4.49
- 相应代码反汇编成X86-64汇编
- 把上述X68-64汇编翻译成Y86-64汇编，并给出相应机器码
作业4.47
- 书写一个C版本的冒泡排序法，void bubble_a(int *data, int count)用指针引用数组元素，main函数中测试代码如下：
void main()
{
int data[5]={4,3,2,1,0};
int i;
bubble_a(data,5);
for(i=0;i<5;i++)
{
printf("%2d",data[i]);
}
}
-
运行结果
-
书写并测试一个由这个函数和测试代码组成的Y86-64程序
-
X86-64汇编：
-
主函数
main:
.LFB2:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $48, %rsp
movq %fs:40, %rax
movq %rax, -8(%rbp)
xorl %eax, %eax
movl $4, -32(%rbp)
movl $3, -28(%rbp)
movl $2, -24(%rbp)
movl $1, -20(%rbp)
movl $0, -16(%rbp)
leaq -32(%rbp), %rax
movl $5, %esi
movq %rax, %rdi
movl $0, %eax
call bubble_a
movl $0, -36(%rbp)
jmp .L2
.L3:
movl -36(%rbp), %eax
cltq
movl -32(%rbp,%rax,4), %eax
movl %eax, %esi
movl $.LC0, %edi
movl $0, %eax
call printf
addl $1, -36(%rbp)
.L2:
cmpl $4, -36(%rbp)
jle .L3
movl $10, %edi
call putchar
nop
movq -8(%rbp), %rax
xorq %fs:40, %rax
je .L4
call __stack_chk_fail
.L4:
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE2:
.size main, .-main
.globl bubble_a
.type bubble_a, @function
- 功能函数：
bubble_a:
.LFB3:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movq %rdi, -24(%rbp)
movl %esi, -28(%rbp)
movl $1, -8(%rbp)
jmp .L6
.L10:
movl -8(%rbp), %eax
subl $1, %eax
movl %eax, -12(%rbp)
jmp .L7
.L9:
movl -12(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %edx
movl -12(%rbp), %eax
cltq
leaq 0(,%rax,4), %rcx
movq -24(%rbp), %rax
addq %rcx, %rax
movl (%rax), %eax
cmpl %eax, %edx
jge .L8
movl -12(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %eax
movl %eax, -4(%rbp)
movl -12(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -12(%rbp), %eax
cltq
leaq 0(,%rax,4), %rcx
movq -24(%rbp), %rax
addq %rcx, %rax
movl (%rax), %eax
movl %eax, (%rdx)
movl -12(%rbp), %eax
cltq
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -4(%rbp), %eax
movl %eax, (%rdx)
.L8:
subl $1, -12(%rbp)
.L7:
cmpl $0, -12(%rbp)
jns .L9
addl $1, -8(%rbp)
.L6:
movl -8(%rbp), %eax
cmpl -28(%rbp), %eax
jl .L10
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE3:
.size bubble_a, .-bubble_a
.ident "GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609"
.section .note.GNU-stack,"",@progbits
- X86-64机器码：
000000000000009e <bubble_a>:
9e: 55 push %rbp
9f: 48 89 e5 mov %rsp,%rbp
a2: 48 89 7d e8 mov %rdi,-0x18(%rbp)
a6: 89 75 e4 mov %esi,-0x1c(%rbp)
a9: c7 45 f8 01 00 00 00 movl $0x1,-0x8(%rbp)
b0: e9 ba 00 00 00 jmpq 16f <bubble_a+0xd1>
b5: 8b 45 f8 mov -0x8(%rbp),%eax
b8: 83 e8 01 sub $0x1,%eax
bb: 89 45 f4 mov %eax,-0xc(%rbp)
be: e9 9e 00 00 00 jmpq 161 <bubble_a+0xc3>
c3: 8b 45 f4 mov -0xc(%rbp),%eax
c6: 48 98 cltq
c8: 48 83 c0 01 add $0x1,%rax
cc: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
d3: 00
d4: 48 8b 45 e8 mov -0x18(%rbp),%rax
d8: 48 01 d0 add %rdx,%rax
db: 8b 10 mov (%rax),%edx
dd: 8b 45 f4 mov -0xc(%rbp),%eax
e0: 48 98 cltq
e2: 48 8d 0c 85 00 00 00 lea 0x0(,%rax,4),%rcx
e9: 00
ea: 48 8b 45 e8 mov -0x18(%rbp),%rax
ee: 48 01 c8 add %rcx,%rax
f1: 8b 00 mov (%rax),%eax
f3: 39 c2 cmp %eax,%edx
f5: 7d 66 jge 15d <bubble_a+0xbf>
f7: 8b 45 f4 mov -0xc(%rbp),%eax
fa: 48 98 cltq
fc: 48 83 c0 01 add $0x1,%rax
100: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
107: 00
108: 48 8b 45 e8 mov -0x18(%rbp),%rax
10c: 48 01 d0 add %rdx,%rax
10f: 8b 00 mov (%rax),%eax
111: 89 45 fc mov %eax,-0x4(%rbp)
114: 8b 45 f4 mov -0xc(%rbp),%eax
117: 48 98 cltq
119: 48 83 c0 01 add $0x1,%rax
11d: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
124: 00
125: 48 8b 45 e8 mov -0x18(%rbp),%rax
129: 48 01 c2 add %rax,%rdx
12c: 8b 45 f4 mov -0xc(%rbp),%eax
12f: 48 98 cltq
131: 48 8d 0c 85 00 00 00 lea 0x0(,%rax,4),%rcx
138: 00
139: 48 8b 45 e8 mov -0x18(%rbp),%rax
13d: 48 01 c8 add %rcx,%rax
140: 8b 00 mov (%rax),%eax
142: 89 02 mov %eax,(%rdx)
144: 8b 45 f4 mov -0xc(%rbp),%eax
147: 48 98 cltq
149: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
150: 00
151: 48 8b 45 e8 mov -0x18(%rbp),%rax
155: 48 01 c2 add %rax,%rdx
158: 8b 45 fc mov -0x4(%rbp),%eax
15b: 89 02 mov %eax,(%rdx)
15d: 83 6d f4 01 subl $0x1,-0xc(%rbp)
161: 83 7d f4 00 cmpl $0x0,-0xc(%rbp)
165: 0f 89 58 ff ff ff jns c3 <bubble_a+0x25>
16b: 83 45 f8 01 addl $0x1,-0x8(%rbp)
16f: 8b 45 f8 mov -0x8(%rbp),%eax
172: 3b 45 e4 cmp -0x1c(%rbp),%eax
175: 0f 8c 3a ff ff ff jl b5 <bubble_a+0x17>
17b: 90 nop
17c: 5d pop %rbp
17d: c3 retq
- Y86-64汇编：
bubble_c:
.LFB22:
.cfi_startproc
pushl %edi
.cfi_def_cfa_offset 8
.cfi_offset 7, -8
pushl %esi
.cfi_def_cfa_offset 12
.cfi_offset 6, -12
pushl %ebx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
mrmovl 16(%esp), %edx
mrmovl 20(%esp), %edi
irmovl $1, %eax
subl %eax, %edi
jle .L1
subl $1, %edi
irmovl $0, %esi
.L6:
rrmovl %esi, %eax
irmovl $0 , ebx
subl %ebx, %esi
jl .L3
.L7:
rrmovl %eax, %ecx
addl %ecx, %ecx
addl %ecx, %ecx
addl %edx, %ecx
mrmovl 4(%ecx), %ecx
rrmovl %eax, %ebx
addl %ecx, %ebx
addl %ecx, %ebx
addl %edx, %ebx
mrmovl (%ebx), %ebx
subl %ebx, %ecx
jge .L4
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ebx, 4(%eax)
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ecx, 4(%eax)
.L4:
subl $1, %eax
irmovl $-1, %edx
subl %edx, %eax
jne .L7
.L3:
addl $1, %esi
subl %edi, %esi
jne .L6
.L1:
popl %ebx
.cfi_def_cfa_offset 12
.cfi_restore 3
popl %esi
.cfi_def_cfa_offset 8
.cfi_restore 6
popl %edi
.cfi_def_cfa_offset 4
.cfi_restore 7
ret
.cfi_endproc
.LFE22:
.size bubble_c, .-bubble_c
.section .rodata.str1.1,"aMS",@progbits,1
作业4.48
不使用跳转，最多使用3次条件传送
1 #include<stdio.h>
2
3 void bubble_a(long *data,long count)
4 {
5 long i,last,t,j;
6 for(last = count-1;last>0;last--)
7 {
8 for(i = 0;i<last;i++)
9 {
10 t=*(data+i)-*(data+i+1);
11 if(t>0){
12 *(data+i)=t;
13 *(data+i)=*(data+i+1);
14 *(data+i+1)=t;
15 }
16 }
17 }
18 }
19 int main()
20 {
21 int i;
22 long data[10] = {2,3,4,5,6,7,8,9,0,1};
23 bubble_a(data,10);
24 for(i=0;i<10;i++)
25 {
26 printf("%d\n",*(data+i));
27 }
28 return 0;
29 }
X86-64汇编：
bubble_c:
.LFB3:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movq %rdi, -24(%rbp)
movl %esi, -28(%rbp)
movl $1, -12(%rbp)
jmp .L6
.L9:
movl -12(%rbp), %eax
subl $1, %eax
movl %eax, -16(%rbp)
jmp .L7
.L8:
movl -16(%rbp), %eax
cltq
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %eax
movl %eax, -8(%rbp)
movl -16(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %eax
movl %eax, -4(%rbp)
movl -16(%rbp), %eax
cltq
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -4(%rbp), %eax
cmpl %eax, -8(%rbp)
cmovle -8(%rbp), %eax
movl %eax, (%rdx)
movl -16(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -8(%rbp), %eax
cmpl %eax, -4(%rbp)
cmovge -4(%rbp), %eax
movl %eax, (%rdx)
subl $1, -16(%rbp)
.L7:
cmpl $0, -16(%rbp)
jns .L8
addl $1, -12(%rbp)
.L6:
movl -12(%rbp), %eax
cmpl -28(%rbp), %eax
jl .L9
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE3:
.size bubble_c, .-bubble_c
.ident "GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609"
.section .note.GNU-stack,"",@progbits
X86-64机器码：
000000000000009e <bubble_c>:
9e: 55 push %rbp
9f: 48 89 e5 mov %rsp,%rbp
a2: 48 89 7d e8 mov %rdi,-0x18(%rbp)
a6: 89 75 e4 mov %esi,-0x1c(%rbp)
a9: c7 45 f4 01 00 00 00 movl $0x1,-0xc(%rbp)
b0: e9 97 00 00 00 jmpq 14c <bubble_c+0xae>
b5: 8b 45 f4 mov -0xc(%rbp),%eax
b8: 83 e8 01 sub $0x1,%eax
bb: 89 45 f0 mov %eax,-0x10(%rbp)
be: eb 7e jmp 13e <bubble_c+0xa0>
c0: 8b 45 f0 mov -0x10(%rbp),%eax
c3: 48 98 cltq
c5: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
cc: 00
cd: 48 8b 45 e8 mov -0x18(%rbp),%rax
d1: 48 01 d0 add %rdx,%rax
d4: 8b 00 mov (%rax),%eax
d6: 89 45 f8 mov %eax,-0x8(%rbp)
d9: 8b 45 f0 mov -0x10(%rbp),%eax
dc: 48 98 cltq
de: 48 83 c0 01 add $0x1,%rax
e2: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
e9: 00
ea: 48 8b 45 e8 mov -0x18(%rbp),%rax
ee: 48 01 d0 add %rdx,%rax
f1: 8b 00 mov (%rax),%eax
f3: 89 45 fc mov %eax,-0x4(%rbp)
f6: 8b 45 f0 mov -0x10(%rbp),%eax
f9: 48 98 cltq
fb: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
102: 00
103: 48 8b 45 e8 mov -0x18(%rbp),%rax
107: 48 01 c2 add %rax,%rdx
10a: 8b 45 fc mov -0x4(%rbp),%eax
10d: 39 45 f8 cmp %eax,-0x8(%rbp)
110: 0f 4e 45 f8 cmovle -0x8(%rbp),%eax
114: 89 02 mov %eax,(%rdx)
116: 8b 45 f0 mov -0x10(%rbp),%eax
119: 48 98 cltq
11b: 48 83 c0 01 add $0x1,%rax
11f: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
126: 00
127: 48 8b 45 e8 mov -0x18(%rbp),%rax
12b: 48 01 c2 add %rax,%rdx
12e: 8b 45 f8 mov -0x8(%rbp),%eax
131: 39 45 fc cmp %eax,-0x4(%rbp)
134: 0f 4d 45 fc cmovge -0x4(%rbp),%eax
138: 89 02 mov %eax,(%rdx)
13a: 83 6d f0 01 subl $0x1,-0x10(%rbp)
13e: 83 7d f0 00 cmpl $0x0,-0x10(%rbp)
142: 0f 89 78 ff ff ff jns c0 <bubble_c+0x22>
148: 83 45 f4 01 addl $0x1,-0xc(%rbp)
14c: 8b 45 f4 mov -0xc(%rbp),%eax
14f: 3b 45 e4 cmp -0x1c(%rbp),%eax
152: 0f 8c 5d ff ff ff jl b5 <bubble_c+0x17>
158: 90 nop
159: 5d pop %rbp
15a: c3 retq
Y86-64汇编：
bubble_b:
.LFB22:
.cfi_startproc
pushl %edi
.cfi_def_cfa_offset 8
.cfi_offset 7, -8
pushl %esi
.cfi_def_cfa_offset 12
.cfi_offset 6, -12
pushl %ebx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
mrmovl 16(%esp), %edx
mrmovl 20(%esp), %edi
irmovl $1, %eax
subl %eax, %edi
jle .L1
subl $1, %edi
irmovl $0, %esi
.L6:
movl (%ebx,%eax,4), %edx
movl 4(%ebx,%eax,4), %ecx
cmpl %edx, %ecx
movl %edx, %ebp
cmovle %ecx, %ebp
movl %ebp, (%ebx,%eax,4)
cmovge %ecx, %edx
movl %edx, 4(%ebx,%eax,4)
subl $1, %eax
cmpl $-1, %eax
jne .L6
.L7:
rrmovl %eax, %ecx
addl %ecx, %ecx
addl %ecx, %ecx
addl %edx, %ecx
mrmovl 4(%ecx), %ecx
rrmovl %eax, %ebx
addl %ecx, %ebx
addl %ecx, %ebx
addl %edx, %ebx
mrmovl (%ebx), %ebx
subl %ebx, %ecx
jge .L4
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ebx, 4(%eax)
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ecx, 4(%eax)
.L4:
subl $1, %eax
irmovl $-1, %edx
subl %edx, %eax
jne .L7
.L3:
addl $1, %esi
subl %edi, %esi
jne .L6
.L1:
popl %ebx
.cfi_def_cfa_offset 12
.cfi_restore 3
popl %esi
.cfi_def_cfa_offset 8
.cfi_restore 6
popl %edi
.cfi_def_cfa_offset 4
.cfi_restore 7
ret
.cfi_endproc
.LFE22:
.size bubble_b, .-bubble_b
.section .rodata.str1.1,"aMS",@progbits,1
作业4.49
不使用跳转，最多使用1次条件传送，需借助栈来保存其中一个操作数的值。代码如下：
1 #include<stdio.h>
2 #include"duizhan.h"
3
4 void bubble_a(long *data,long count)
5 {
6 long i,last,t,j;
7 struct Stack* ps;
8 init(ps);
9 for(last = count-1;last>0;last--)
10 {
11 for(i = 0;i<last;i++)
12 {
13 j=*(data+i)-*(data+i+1);
14 if(j>0)
15 {
16 push(ps,*(data+i+1));
17 *(data+i+1)=*(data+i);
18 pop(ps,data+i);
19 }
20 }
21 }
22 }
23 int main()
24 {
25 int i;
26 long data[10] = {2,3,4,5,6,7,8,9,0,1};
27 bubble_a(data,10);
28 for(i=0;i<10;i++)
29 {
30 printf("%d\n",*(data+i));
31 }
32 return 0;
33 }
需要先编辑一个包含栈操作的头文件duizhan.h，其中包含栈的初始化函数init(),入栈函数push()，弹栈函数pop()
- X86-64汇编：
bubble_c:
.LFB3:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movq %rdi, -24(%rbp)
movl %esi, -28(%rbp)
movl $1, -12(%rbp)
jmp .L6
.L9:
movl -12(%rbp), %eax
subl $1, %eax
movl %eax, -16(%rbp)
jmp .L7
.L8:
movl -16(%rbp), %eax
cltq
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %eax
movl %eax, -8(%rbp)
movl -16(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rdx, %rax
movl (%rax), %eax
movl %eax, -4(%rbp)
movl -16(%rbp), %eax
cltq
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -4(%rbp), %eax
cmpl %eax, -8(%rbp)
cmovle -8(%rbp), %eax
movl %eax, (%rdx)
movl -16(%rbp), %eax
cltq
addq $1, %rax
leaq 0(,%rax,4), %rdx
movq -24(%rbp), %rax
addq %rax, %rdx
movl -8(%rbp), %eax
movl %eax, (%rdx)
subl $1, -16(%rbp)
.L7:
cmpl $0, -16(%rbp)
jns .L8
addl $1, -12(%rbp)
.L6:
movl -12(%rbp), %eax
cmpl -28(%rbp), %eax
jl .L9
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE3:
.size bubble_c, .-bubble_c
.ident "GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609"
.section .note.GNU-stack,"",@progbits
- X86-64机器码：
0000000000000094 <bubble_c>:
94: 55 push %rbp
95: 48 89 e5 mov %rsp,%rbp
98: 48 89 7d e8 mov %rdi,-0x18(%rbp)
9c: 89 75 e4 mov %esi,-0x1c(%rbp)
9f: c7 45 f4 01 00 00 00 movl $0x1,-0xc(%rbp)
a6: e9 8c 00 00 00 jmpq 137 <bubble_c+0xa3>
ab: 8b 45 f4 mov -0xc(%rbp),%eax
ae: 83 e8 01 sub $0x1,%eax
b1: 89 45 f0 mov %eax,-0x10(%rbp)
b4: eb 77 jmp 12d <bubble_c+0x99>
b6: 8b 45 f0 mov -0x10(%rbp),%eax
b9: 48 98 cltq
bb: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
c2: 00
c3: 48 8b 45 e8 mov -0x18(%rbp),%rax
c7: 48 01 d0 add %rdx,%rax
ca: 8b 00 mov (%rax),%eax
cc: 89 45 f8 mov %eax,-0x8(%rbp)
cf: 8b 45 f0 mov -0x10(%rbp),%eax
d2: 48 98 cltq
d4: 48 83 c0 01 add $0x1,%rax
d8: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
df: 00
e0: 48 8b 45 e8 mov -0x18(%rbp),%rax
e4: 48 01 d0 add %rdx,%rax
e7: 8b 00 mov (%rax),%eax
e9: 89 45 fc mov %eax,-0x4(%rbp)
ec: 8b 45 f0 mov -0x10(%rbp),%eax
ef: 48 98 cltq
f1: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
f8: 00
f9: 48 8b 45 e8 mov -0x18(%rbp),%rax
fd: 48 01 c2 add %rax,%rdx
100: 8b 45 fc mov -0x4(%rbp),%eax
103: 39 45 f8 cmp %eax,-0x8(%rbp)
106: 0f 4e 45 f8 cmovle -0x8(%rbp),%eax
10a: 89 02 mov %eax,(%rdx)
10c: 8b 45 f0 mov -0x10(%rbp),%eax
10f: 48 98 cltq
111: 48 83 c0 01 add $0x1,%rax
115: 48 8d 14 85 00 00 00 lea 0x0(,%rax,4),%rdx
11c: 00
11d: 48 8b 45 e8 mov -0x18(%rbp),%rax
121: 48 01 c2 add %rax,%rdx
124: 8b 45 f8 mov -0x8(%rbp),%eax
127: 89 02 mov %eax,(%rdx)
129: 83 6d f0 01 subl $0x1,-0x10(%rbp)
12d: 83 7d f0 00 cmpl $0x0,-0x10(%rbp)
131: 79 83 jns b6 <bubble_c+0x22>
133: 83 45 f4 01 addl $0x1,-0xc(%rbp)
137: 8b 45 f4 mov -0xc(%rbp),%eax
13a: 3b 45 e4 cmp -0x1c(%rbp),%eax
13d: 0f 8c 68 ff ff ff jl ab <bubble_c+0x17>
143: 90 nop
144: 5d pop %rbp
145: c3 retq
- Y86-64汇编：
bubble_b:
.LFB22:
.cfi_startproc
pushl %edi
.cfi_def_cfa_offset 8
.cfi_offset 7, -8
pushl %esi
.cfi_def_cfa_offset 12
.cfi_offset 6, -12
pushl %ebx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
mrmovl 16(%esp), %edx
mrmovl 20(%esp), %edi
irmovl $1, %eax
subl %eax, %edi
jle .L1
subl $1, %edi
irmovl $0, %esi
.L6:
movl (%ebx,%eax,4), %edx
movl 4(%ebx,%eax,4), %ecx
cmpl %edx, %ecx
movl %edx, %ebp
cmovle %ecx, %ebp
movl %edx, 4(%ebx,%eax,4)
subl $1, %eax
cmpl $-1, %eax
jne .L6
.L7:
rrmovl %eax, %ecx
addl %ecx, %ecx
addl %ecx, %ecx
addl %edx, %ecx
mrmovl 4(%ecx), %ecx
rrmovl %eax, %ebx
addl %ecx, %ebx
addl %ecx, %ebx
addl %edx, %ebx
mrmovl (%ebx), %ebx
subl %ebx, %ecx
jge .L4
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ebx, 4(%eax)
addl %eax, %eax
addl %eax, %eax
addl %edx, %eax
rmmovl %ecx, 4(%eax)
.L4:
subl $1, %eax
irmovl $-1, %edx
subl %edx, %eax
jne .L7
.L3:
addl $1, %esi
subl %edi, %esi
jne .L6
.L1:
popl %ebx
.cfi_def_cfa_offset 12
.cfi_restore 3
popl %esi
.cfi_def_cfa_offset 8
.cfi_restore 6
popl %edi
.cfi_def_cfa_offset 4
.cfi_restore 7
ret
.cfi_endproc
.LFE22:
.size bubble_b, .-bubble_b
.section .rodata.str1.1,"aMS",@progbits,1
多进程实现daytime服务器
- 服务器
#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>
#include<sys/socket.h>
#include<sys/types.h> //pthread_t , pthread_attr_t and so on.
#include<netinet/in.h> //structure sockaddr_in
#include<arpa/inet.h> //Func : htonl; htons; ntohl; ntohs
#include<assert.h> //Func :assert
#include<string.h> //Func :memset
#include<unistd.h> //Func :close,write,read
#include<ctype.h>
#include<arpa/inet.h>
#include <time.h>
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
#define MAX_CONN_LIMIT 5 //MAX connection limit
static void Data_handle(void * sock_fd);
struct sockaddr_in s_addr_in;
struct sockaddr_in s_addr_client;
int sockfd;
int main()
{
int sockfd_server;
int fd_temp;
int client_length;
sockfd_server = socket(AF_INET,SOCK_STREAM,0); //ipv4,TCP
assert(sockfd_server != -1);
//before bind(), set the attr of structure sockaddr.
memset(&s_addr_in,0,sizeof(s_addr_in));
s_addr_in.sin_family = AF_INET;
s_addr_in.sin_addr.s_addr = htonl(INADDR_ANY); //trans addr from uint32_t host byte order to network byte order.
s_addr_in.sin_port = htons(SOCK_PORT); //trans port from uint16_t host byte order to network byte order.
fd_temp = bind(sockfd_server,(struct scokaddr*)(&s_addr_in),sizeof(s_addr_in));
if(fd_temp == -1)
{
fprintf(stderr,"bind error!\n");
exit(1);
}
fd_temp = listen(sockfd_server,MAX_CONN_LIMIT);
if(fd_temp == -1)
{
fprintf(stderr,"listen error!\n");
exit(1);
}
while(1)
{
//printf("waiting for new connection...\n");
pthread_t thread_id;
client_length = sizeof(s_addr_client);
//Block here. Until server accpets a new connection.
sockfd = accept(sockfd_server,(struct sockaddr*)(&s_addr_client),&client_length);
time_t t = time(0);
char tmp[64];
strftime( tmp, sizeof(tmp), "%Y/%m/%d %X %A\n\t", localtime(&t) );
send(sockfd,tmp,strlen(tmp),0);
close(sockfd); //close a file descriptor.
if(sockfd == -1)
{
fprintf(stderr,"Accept error!\n");
continue; //ignore current socket ,continue while loop.
}
if(pthread_create(&thread_id,NULL,(void *)(&Data_handle),(void *)(&sockfd)) == -1)
{
fprintf(stderr,"pthread_create error!\n");
break; //break while loop
}
}
//Clear
int ret = shutdown(sockfd_server,SHUT_WR); //shut down the all or part of a full-duplex connection.
assert(ret != -1);
return 0;
}
static void Data_handle(void * sock_fd)
{
int fd = *((int *)sock_fd);
int i_recvBytes;
char data_recv[BUFFER_LENGTH];
printf("服务器实现者20155318\t");
printf("客户端IP：%s\n",inet_ntoa(s_addr_client.sin_addr));
pthread_exit(NULL); //terminate calling thread!
}
- 客户端
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<string.h>
#include<ctype.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<sys/wait.h>
#include<signal.h>
#include<errno.h>
#include<pthread.h>
#include <pthread.h>
#define SERV_PORT 13321
#define SERV_IP "127.0.0.1"
#define NUM 3
int std_err(const char* name)
{
perror(name);
exit(1);
}
int main(void)
{
int cfd, ret;
char buf[BUFSIZ];
pid_t pid;
int i;
//创建套节字
cfd = socket(AF_INET, SOCK_STREAM, 0);
if(cfd == -1)
std_err("socket");
//定义IP ， 端口
struct sockaddr_in clie_addr;
clie_addr.sin_family = AF_INET;
clie_addr.sin_port = htons(SERV_PORT);
//转换IP 字符串的地址
ret = inet_pton(AF_INET, SERV_IP, &clie_addr.sin_addr.s_addr);
if(ret != 1)
std_err("inet_pton");
//链接服务器
ret = connect(cfd, (struct sockaddr*)&clie_addr, sizeof(clie_addr));
if(ret == -1)
std_err("connect");
char buff[256];
int nRecv=recv(cfd,buff,256,0);
if(nRecv>0)
{
buff[nRecv]='\0';
printf("当前时间：%s\n",buff);
}
//关闭套节字
close(cfd);
return 0;
}
- 运行截图
