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forktest.asm
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_forktest: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
printf(1, "fork test OK\n");
}
int
main(void)
{
0: 8d 4c 24 04 lea 0x4(%esp),%ecx
4: 83 e4 f0 and $0xfffffff0,%esp
7: ff 71 fc pushl -0x4(%ecx)
a: 55 push %ebp
b: 89 e5 mov %esp,%ebp
d: 51 push %ecx
e: 83 ec 04 sub $0x4,%esp
forktest();
11: e8 3a 00 00 00 call 50 <forktest>
exit();
16: e8 87 03 00 00 call 3a2 <exit>
1b: 66 90 xchg %ax,%ax
1d: 66 90 xchg %ax,%ax
1f: 90 nop
00000020 <printf>:
{
20: 55 push %ebp
21: 89 e5 mov %esp,%ebp
23: 53 push %ebx
24: 83 ec 10 sub $0x10,%esp
27: 8b 5d 0c mov 0xc(%ebp),%ebx
write(fd, s, strlen(s));
2a: 53 push %ebx
2b: e8 a0 01 00 00 call 1d0 <strlen>
30: 83 c4 0c add $0xc,%esp
33: 50 push %eax
34: 53 push %ebx
35: ff 75 08 pushl 0x8(%ebp)
38: e8 85 03 00 00 call 3c2 <write>
}
3d: 83 c4 10 add $0x10,%esp
40: 8b 5d fc mov -0x4(%ebp),%ebx
43: c9 leave
44: c3 ret
45: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
49: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
00000050 <forktest>:
{
50: 55 push %ebp
51: 89 e5 mov %esp,%ebp
53: 53 push %ebx
for(n=0; n<N; n++){
54: 31 db xor %ebx,%ebx
{
56: 83 ec 10 sub $0x10,%esp
write(fd, s, strlen(s));
59: 68 4c 04 00 00 push $0x44c
5e: e8 6d 01 00 00 call 1d0 <strlen>
63: 83 c4 0c add $0xc,%esp
66: 50 push %eax
67: 68 4c 04 00 00 push $0x44c
6c: 6a 01 push $0x1
6e: e8 4f 03 00 00 call 3c2 <write>
73: 83 c4 10 add $0x10,%esp
76: eb 19 jmp 91 <forktest+0x41>
78: 90 nop
79: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
if(pid == 0)
80: 0f 84 7c 00 00 00 je 102 <forktest+0xb2>
for(n=0; n<N; n++){
86: 83 c3 01 add $0x1,%ebx
89: 81 fb e8 03 00 00 cmp $0x3e8,%ebx
8f: 74 4f je e0 <forktest+0x90>
pid = fork();
91: e8 04 03 00 00 call 39a <fork>
if(pid < 0)
96: 85 c0 test %eax,%eax
98: 79 e6 jns 80 <forktest+0x30>
for(; n > 0; n--){
9a: 85 db test %ebx,%ebx
9c: 74 10 je ae <forktest+0x5e>
9e: 66 90 xchg %ax,%ax
if(wait() < 0){
a0: e8 05 03 00 00 call 3aa <wait>
a5: 85 c0 test %eax,%eax
a7: 78 5e js 107 <forktest+0xb7>
for(; n > 0; n--){
a9: 83 eb 01 sub $0x1,%ebx
ac: 75 f2 jne a0 <forktest+0x50>
if(wait() != -1){
ae: e8 f7 02 00 00 call 3aa <wait>
b3: 83 f8 ff cmp $0xffffffff,%eax
b6: 75 71 jne 129 <forktest+0xd9>
write(fd, s, strlen(s));
b8: 83 ec 0c sub $0xc,%esp
bb: 68 7e 04 00 00 push $0x47e
c0: e8 0b 01 00 00 call 1d0 <strlen>
c5: 83 c4 0c add $0xc,%esp
c8: 50 push %eax
c9: 68 7e 04 00 00 push $0x47e
ce: 6a 01 push $0x1
d0: e8 ed 02 00 00 call 3c2 <write>
}
d5: 8b 5d fc mov -0x4(%ebp),%ebx
d8: c9 leave
d9: c3 ret
da: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
write(fd, s, strlen(s));
e0: 83 ec 0c sub $0xc,%esp
e3: 68 8c 04 00 00 push $0x48c
e8: e8 e3 00 00 00 call 1d0 <strlen>
ed: 83 c4 0c add $0xc,%esp
f0: 50 push %eax
f1: 68 8c 04 00 00 push $0x48c
f6: 6a 01 push $0x1
f8: e8 c5 02 00 00 call 3c2 <write>
exit();
fd: e8 a0 02 00 00 call 3a2 <exit>
exit();
102: e8 9b 02 00 00 call 3a2 <exit>
write(fd, s, strlen(s));
107: 83 ec 0c sub $0xc,%esp
10a: 68 57 04 00 00 push $0x457
10f: e8 bc 00 00 00 call 1d0 <strlen>
114: 83 c4 0c add $0xc,%esp
117: 50 push %eax
118: 68 57 04 00 00 push $0x457
11d: 6a 01 push $0x1
11f: e8 9e 02 00 00 call 3c2 <write>
exit();
124: e8 79 02 00 00 call 3a2 <exit>
write(fd, s, strlen(s));
129: 83 ec 0c sub $0xc,%esp
12c: 68 6b 04 00 00 push $0x46b
131: e8 9a 00 00 00 call 1d0 <strlen>
136: 83 c4 0c add $0xc,%esp
139: 50 push %eax
13a: 68 6b 04 00 00 push $0x46b
13f: 6a 01 push $0x1
141: e8 7c 02 00 00 call 3c2 <write>
exit();
146: e8 57 02 00 00 call 3a2 <exit>
14b: 66 90 xchg %ax,%ax
14d: 66 90 xchg %ax,%ax
14f: 90 nop
00000150 <strcpy>:
#include "user.h"
#include "x86.h"
char*
strcpy(char *s, const char *t)
{
150: 55 push %ebp
151: 89 e5 mov %esp,%ebp
153: 53 push %ebx
154: 8b 45 08 mov 0x8(%ebp),%eax
157: 8b 4d 0c mov 0xc(%ebp),%ecx
char *os;
os = s;
while((*s++ = *t++) != 0)
15a: 89 c2 mov %eax,%edx
15c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
160: 83 c1 01 add $0x1,%ecx
163: 0f b6 59 ff movzbl -0x1(%ecx),%ebx
167: 83 c2 01 add $0x1,%edx
16a: 84 db test %bl,%bl
16c: 88 5a ff mov %bl,-0x1(%edx)
16f: 75 ef jne 160 <strcpy+0x10>
;
return os;
}
171: 5b pop %ebx
172: 5d pop %ebp
173: c3 ret
174: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
17a: 8d bf 00 00 00 00 lea 0x0(%edi),%edi
00000180 <strcmp>:
int
strcmp(const char *p, const char *q)
{
180: 55 push %ebp
181: 89 e5 mov %esp,%ebp
183: 53 push %ebx
184: 8b 55 08 mov 0x8(%ebp),%edx
187: 8b 4d 0c mov 0xc(%ebp),%ecx
while(*p && *p == *q)
18a: 0f b6 02 movzbl (%edx),%eax
18d: 0f b6 19 movzbl (%ecx),%ebx
190: 84 c0 test %al,%al
192: 75 1c jne 1b0 <strcmp+0x30>
194: eb 2a jmp 1c0 <strcmp+0x40>
196: 8d 76 00 lea 0x0(%esi),%esi
199: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
p++, q++;
1a0: 83 c2 01 add $0x1,%edx
while(*p && *p == *q)
1a3: 0f b6 02 movzbl (%edx),%eax
p++, q++;
1a6: 83 c1 01 add $0x1,%ecx
1a9: 0f b6 19 movzbl (%ecx),%ebx
while(*p && *p == *q)
1ac: 84 c0 test %al,%al
1ae: 74 10 je 1c0 <strcmp+0x40>
1b0: 38 d8 cmp %bl,%al
1b2: 74 ec je 1a0 <strcmp+0x20>
return (uchar)*p - (uchar)*q;
1b4: 29 d8 sub %ebx,%eax
}
1b6: 5b pop %ebx
1b7: 5d pop %ebp
1b8: c3 ret
1b9: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
1c0: 31 c0 xor %eax,%eax
return (uchar)*p - (uchar)*q;
1c2: 29 d8 sub %ebx,%eax
}
1c4: 5b pop %ebx
1c5: 5d pop %ebp
1c6: c3 ret
1c7: 89 f6 mov %esi,%esi
1c9: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
000001d0 <strlen>:
uint
strlen(const char *s)
{
1d0: 55 push %ebp
1d1: 89 e5 mov %esp,%ebp
1d3: 8b 4d 08 mov 0x8(%ebp),%ecx
int n;
for(n = 0; s[n]; n++)
1d6: 80 39 00 cmpb $0x0,(%ecx)
1d9: 74 15 je 1f0 <strlen+0x20>
1db: 31 d2 xor %edx,%edx
1dd: 8d 76 00 lea 0x0(%esi),%esi
1e0: 83 c2 01 add $0x1,%edx
1e3: 80 3c 11 00 cmpb $0x0,(%ecx,%edx,1)
1e7: 89 d0 mov %edx,%eax
1e9: 75 f5 jne 1e0 <strlen+0x10>
;
return n;
}
1eb: 5d pop %ebp
1ec: c3 ret
1ed: 8d 76 00 lea 0x0(%esi),%esi
for(n = 0; s[n]; n++)
1f0: 31 c0 xor %eax,%eax
}
1f2: 5d pop %ebp
1f3: c3 ret
1f4: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
1fa: 8d bf 00 00 00 00 lea 0x0(%edi),%edi
00000200 <memset>:
void*
memset(void *dst, int c, uint n)
{
200: 55 push %ebp
201: 89 e5 mov %esp,%ebp
203: 57 push %edi
204: 8b 55 08 mov 0x8(%ebp),%edx
}
static inline void
stosb(void *addr, int data, int cnt)
{
asm volatile("cld; rep stosb" :
207: 8b 4d 10 mov 0x10(%ebp),%ecx
20a: 8b 45 0c mov 0xc(%ebp),%eax
20d: 89 d7 mov %edx,%edi
20f: fc cld
210: f3 aa rep stos %al,%es:(%edi)
stosb(dst, c, n);
return dst;
}
212: 89 d0 mov %edx,%eax
214: 5f pop %edi
215: 5d pop %ebp
216: c3 ret
217: 89 f6 mov %esi,%esi
219: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
00000220 <strchr>:
char*
strchr(const char *s, char c)
{
220: 55 push %ebp
221: 89 e5 mov %esp,%ebp
223: 53 push %ebx
224: 8b 45 08 mov 0x8(%ebp),%eax
227: 8b 5d 0c mov 0xc(%ebp),%ebx
for(; *s; s++)
22a: 0f b6 10 movzbl (%eax),%edx
22d: 84 d2 test %dl,%dl
22f: 74 1d je 24e <strchr+0x2e>
if(*s == c)
231: 38 d3 cmp %dl,%bl
233: 89 d9 mov %ebx,%ecx
235: 75 0d jne 244 <strchr+0x24>
237: eb 17 jmp 250 <strchr+0x30>
239: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
240: 38 ca cmp %cl,%dl
242: 74 0c je 250 <strchr+0x30>
for(; *s; s++)
244: 83 c0 01 add $0x1,%eax
247: 0f b6 10 movzbl (%eax),%edx
24a: 84 d2 test %dl,%dl
24c: 75 f2 jne 240 <strchr+0x20>
return (char*)s;
return 0;
24e: 31 c0 xor %eax,%eax
}
250: 5b pop %ebx
251: 5d pop %ebp
252: c3 ret
253: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
259: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
00000260 <gets>:
char*
gets(char *buf, int max)
{
260: 55 push %ebp
261: 89 e5 mov %esp,%ebp
263: 57 push %edi
264: 56 push %esi
265: 53 push %ebx
int i, cc;
char c;
for(i=0; i+1 < max; ){
266: 31 f6 xor %esi,%esi
268: 89 f3 mov %esi,%ebx
{
26a: 83 ec 1c sub $0x1c,%esp
26d: 8b 7d 08 mov 0x8(%ebp),%edi
for(i=0; i+1 < max; ){
270: eb 2f jmp 2a1 <gets+0x41>
272: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
cc = read(0, &c, 1);
278: 8d 45 e7 lea -0x19(%ebp),%eax
27b: 83 ec 04 sub $0x4,%esp
27e: 6a 01 push $0x1
280: 50 push %eax
281: 6a 00 push $0x0
283: e8 32 01 00 00 call 3ba <read>
if(cc < 1)
288: 83 c4 10 add $0x10,%esp
28b: 85 c0 test %eax,%eax
28d: 7e 1c jle 2ab <gets+0x4b>
break;
buf[i++] = c;
28f: 0f b6 45 e7 movzbl -0x19(%ebp),%eax
293: 83 c7 01 add $0x1,%edi
296: 88 47 ff mov %al,-0x1(%edi)
if(c == '\n' || c == '\r')
299: 3c 0a cmp $0xa,%al
29b: 74 23 je 2c0 <gets+0x60>
29d: 3c 0d cmp $0xd,%al
29f: 74 1f je 2c0 <gets+0x60>
for(i=0; i+1 < max; ){
2a1: 83 c3 01 add $0x1,%ebx
2a4: 3b 5d 0c cmp 0xc(%ebp),%ebx
2a7: 89 fe mov %edi,%esi
2a9: 7c cd jl 278 <gets+0x18>
2ab: 89 f3 mov %esi,%ebx
break;
}
buf[i] = '\0';
return buf;
}
2ad: 8b 45 08 mov 0x8(%ebp),%eax
buf[i] = '\0';
2b0: c6 03 00 movb $0x0,(%ebx)
}
2b3: 8d 65 f4 lea -0xc(%ebp),%esp
2b6: 5b pop %ebx
2b7: 5e pop %esi
2b8: 5f pop %edi
2b9: 5d pop %ebp
2ba: c3 ret
2bb: 90 nop
2bc: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
2c0: 8b 75 08 mov 0x8(%ebp),%esi
2c3: 8b 45 08 mov 0x8(%ebp),%eax
2c6: 01 de add %ebx,%esi
2c8: 89 f3 mov %esi,%ebx
buf[i] = '\0';
2ca: c6 03 00 movb $0x0,(%ebx)
}
2cd: 8d 65 f4 lea -0xc(%ebp),%esp
2d0: 5b pop %ebx
2d1: 5e pop %esi
2d2: 5f pop %edi
2d3: 5d pop %ebp
2d4: c3 ret
2d5: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
2d9: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
000002e0 <stat>:
int
stat(const char *n, struct stat *st)
{
2e0: 55 push %ebp
2e1: 89 e5 mov %esp,%ebp
2e3: 56 push %esi
2e4: 53 push %ebx
int fd;
int r;
fd = open(n, O_RDONLY);
2e5: 83 ec 08 sub $0x8,%esp
2e8: 6a 00 push $0x0
2ea: ff 75 08 pushl 0x8(%ebp)
2ed: e8 f0 00 00 00 call 3e2 <open>
if(fd < 0)
2f2: 83 c4 10 add $0x10,%esp
2f5: 85 c0 test %eax,%eax
2f7: 78 27 js 320 <stat+0x40>
return -1;
r = fstat(fd, st);
2f9: 83 ec 08 sub $0x8,%esp
2fc: ff 75 0c pushl 0xc(%ebp)
2ff: 89 c3 mov %eax,%ebx
301: 50 push %eax
302: e8 f3 00 00 00 call 3fa <fstat>
close(fd);
307: 89 1c 24 mov %ebx,(%esp)
r = fstat(fd, st);
30a: 89 c6 mov %eax,%esi
close(fd);
30c: e8 b9 00 00 00 call 3ca <close>
return r;
311: 83 c4 10 add $0x10,%esp
}
314: 8d 65 f8 lea -0x8(%ebp),%esp
317: 89 f0 mov %esi,%eax
319: 5b pop %ebx
31a: 5e pop %esi
31b: 5d pop %ebp
31c: c3 ret
31d: 8d 76 00 lea 0x0(%esi),%esi
return -1;
320: be ff ff ff ff mov $0xffffffff,%esi
325: eb ed jmp 314 <stat+0x34>
327: 89 f6 mov %esi,%esi
329: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
00000330 <atoi>:
int
atoi(const char *s)
{
330: 55 push %ebp
331: 89 e5 mov %esp,%ebp
333: 53 push %ebx
334: 8b 4d 08 mov 0x8(%ebp),%ecx
int n;
n = 0;
while('0' <= *s && *s <= '9')
337: 0f be 11 movsbl (%ecx),%edx
33a: 8d 42 d0 lea -0x30(%edx),%eax
33d: 3c 09 cmp $0x9,%al
n = 0;
33f: b8 00 00 00 00 mov $0x0,%eax
while('0' <= *s && *s <= '9')
344: 77 1f ja 365 <atoi+0x35>
346: 8d 76 00 lea 0x0(%esi),%esi
349: 8d bc 27 00 00 00 00 lea 0x0(%edi,%eiz,1),%edi
n = n*10 + *s++ - '0';
350: 8d 04 80 lea (%eax,%eax,4),%eax
353: 83 c1 01 add $0x1,%ecx
356: 8d 44 42 d0 lea -0x30(%edx,%eax,2),%eax
while('0' <= *s && *s <= '9')
35a: 0f be 11 movsbl (%ecx),%edx
35d: 8d 5a d0 lea -0x30(%edx),%ebx
360: 80 fb 09 cmp $0x9,%bl
363: 76 eb jbe 350 <atoi+0x20>
return n;
}
365: 5b pop %ebx
366: 5d pop %ebp
367: c3 ret
368: 90 nop
369: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
00000370 <memmove>:
void*
memmove(void *vdst, const void *vsrc, int n)
{
370: 55 push %ebp
371: 89 e5 mov %esp,%ebp
373: 56 push %esi
374: 53 push %ebx
375: 8b 5d 10 mov 0x10(%ebp),%ebx
378: 8b 45 08 mov 0x8(%ebp),%eax
37b: 8b 75 0c mov 0xc(%ebp),%esi
char *dst;
const char *src;
dst = vdst;
src = vsrc;
while(n-- > 0)
37e: 85 db test %ebx,%ebx
380: 7e 14 jle 396 <memmove+0x26>
382: 31 d2 xor %edx,%edx
384: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
*dst++ = *src++;
388: 0f b6 0c 16 movzbl (%esi,%edx,1),%ecx
38c: 88 0c 10 mov %cl,(%eax,%edx,1)
38f: 83 c2 01 add $0x1,%edx
while(n-- > 0)
392: 39 d3 cmp %edx,%ebx
394: 75 f2 jne 388 <memmove+0x18>
return vdst;
}
396: 5b pop %ebx
397: 5e pop %esi
398: 5d pop %ebp
399: c3 ret
0000039a <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
39a: b8 01 00 00 00 mov $0x1,%eax
39f: cd 40 int $0x40
3a1: c3 ret
000003a2 <exit>:
SYSCALL(exit)
3a2: b8 02 00 00 00 mov $0x2,%eax
3a7: cd 40 int $0x40
3a9: c3 ret
000003aa <wait>:
SYSCALL(wait)
3aa: b8 03 00 00 00 mov $0x3,%eax
3af: cd 40 int $0x40
3b1: c3 ret
000003b2 <pipe>:
SYSCALL(pipe)
3b2: b8 04 00 00 00 mov $0x4,%eax
3b7: cd 40 int $0x40
3b9: c3 ret
000003ba <read>:
SYSCALL(read)
3ba: b8 05 00 00 00 mov $0x5,%eax
3bf: cd 40 int $0x40
3c1: c3 ret
000003c2 <write>:
SYSCALL(write)
3c2: b8 10 00 00 00 mov $0x10,%eax
3c7: cd 40 int $0x40
3c9: c3 ret
000003ca <close>:
SYSCALL(close)
3ca: b8 15 00 00 00 mov $0x15,%eax
3cf: cd 40 int $0x40
3d1: c3 ret
000003d2 <kill>:
SYSCALL(kill)
3d2: b8 06 00 00 00 mov $0x6,%eax
3d7: cd 40 int $0x40
3d9: c3 ret
000003da <exec>:
SYSCALL(exec)
3da: b8 07 00 00 00 mov $0x7,%eax
3df: cd 40 int $0x40
3e1: c3 ret
000003e2 <open>:
SYSCALL(open)
3e2: b8 0f 00 00 00 mov $0xf,%eax
3e7: cd 40 int $0x40
3e9: c3 ret
000003ea <mknod>:
SYSCALL(mknod)
3ea: b8 11 00 00 00 mov $0x11,%eax
3ef: cd 40 int $0x40
3f1: c3 ret
000003f2 <unlink>:
SYSCALL(unlink)
3f2: b8 12 00 00 00 mov $0x12,%eax
3f7: cd 40 int $0x40
3f9: c3 ret
000003fa <fstat>:
SYSCALL(fstat)
3fa: b8 08 00 00 00 mov $0x8,%eax
3ff: cd 40 int $0x40
401: c3 ret
00000402 <link>:
SYSCALL(link)
402: b8 13 00 00 00 mov $0x13,%eax
407: cd 40 int $0x40
409: c3 ret
0000040a <mkdir>:
SYSCALL(mkdir)
40a: b8 14 00 00 00 mov $0x14,%eax
40f: cd 40 int $0x40
411: c3 ret
00000412 <chdir>:
SYSCALL(chdir)
412: b8 09 00 00 00 mov $0x9,%eax
417: cd 40 int $0x40
419: c3 ret
0000041a <dup>:
SYSCALL(dup)
41a: b8 0a 00 00 00 mov $0xa,%eax
41f: cd 40 int $0x40
421: c3 ret
00000422 <getpid>:
SYSCALL(getpid)
422: b8 0b 00 00 00 mov $0xb,%eax
427: cd 40 int $0x40
429: c3 ret
0000042a <sbrk>:
SYSCALL(sbrk)
42a: b8 0c 00 00 00 mov $0xc,%eax
42f: cd 40 int $0x40
431: c3 ret
00000432 <sleep>:
SYSCALL(sleep)
432: b8 0d 00 00 00 mov $0xd,%eax
437: cd 40 int $0x40
439: c3 ret
0000043a <uptime>:
SYSCALL(uptime)
43a: b8 0e 00 00 00 mov $0xe,%eax
43f: cd 40 int $0x40
441: c3 ret
00000442 <info>:
SYSCALL(info)
442: b8 16 00 00 00 mov $0x16,%eax
447: cd 40 int $0x40
449: c3 ret