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init.asm
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init.asm
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_init: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
char *argv[] = { "sh", 0 };
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 14 sub $0x14,%esp
int pid, wpid;
if(open("console", O_RDWR) < 0){
11: 83 ec 08 sub $0x8,%esp
14: 6a 02 push $0x2
16: 68 e0 08 00 00 push $0x8e0
1b: e8 a8 03 00 00 call 3c8 <open>
20: 83 c4 10 add $0x10,%esp
23: 85 c0 test %eax,%eax
25: 79 26 jns 4d <main+0x4d>
mknod("console", 1, 1);
27: 83 ec 04 sub $0x4,%esp
2a: 6a 01 push $0x1
2c: 6a 01 push $0x1
2e: 68 e0 08 00 00 push $0x8e0
33: e8 98 03 00 00 call 3d0 <mknod>
38: 83 c4 10 add $0x10,%esp
open("console", O_RDWR);
3b: 83 ec 08 sub $0x8,%esp
3e: 6a 02 push $0x2
40: 68 e0 08 00 00 push $0x8e0
45: e8 7e 03 00 00 call 3c8 <open>
4a: 83 c4 10 add $0x10,%esp
}
dup(0); // stdout
4d: 83 ec 0c sub $0xc,%esp
50: 6a 00 push $0x0
52: e8 a9 03 00 00 call 400 <dup>
57: 83 c4 10 add $0x10,%esp
dup(0); // stderr
5a: 83 ec 0c sub $0xc,%esp
5d: 6a 00 push $0x0
5f: e8 9c 03 00 00 call 400 <dup>
64: 83 c4 10 add $0x10,%esp
for(;;){
printf(1, "init: starting sh\n");
67: 83 ec 08 sub $0x8,%esp
6a: 68 e8 08 00 00 push $0x8e8
6f: 6a 01 push $0x1
71: e8 b1 04 00 00 call 527 <printf>
76: 83 c4 10 add $0x10,%esp
pid = fork();
79: e8 02 03 00 00 call 380 <fork>
7e: 89 45 f4 mov %eax,-0xc(%ebp)
if(pid < 0){
81: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
85: 79 17 jns 9e <main+0x9e>
printf(1, "init: fork failed\n");
87: 83 ec 08 sub $0x8,%esp
8a: 68 fb 08 00 00 push $0x8fb
8f: 6a 01 push $0x1
91: e8 91 04 00 00 call 527 <printf>
96: 83 c4 10 add $0x10,%esp
exit();
99: e8 ea 02 00 00 call 388 <exit>
}
if(pid == 0){
9e: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
a2: 75 3e jne e2 <main+0xe2>
exec("sh", argv);
a4: 83 ec 08 sub $0x8,%esp
a7: 68 9c 0b 00 00 push $0xb9c
ac: 68 dd 08 00 00 push $0x8dd
b1: e8 0a 03 00 00 call 3c0 <exec>
b6: 83 c4 10 add $0x10,%esp
printf(1, "init: exec sh failed\n");
b9: 83 ec 08 sub $0x8,%esp
bc: 68 0e 09 00 00 push $0x90e
c1: 6a 01 push $0x1
c3: e8 5f 04 00 00 call 527 <printf>
c8: 83 c4 10 add $0x10,%esp
exit();
cb: e8 b8 02 00 00 call 388 <exit>
}
while((wpid=wait()) >= 0 && wpid != pid)
printf(1, "zombie!\n");
d0: 83 ec 08 sub $0x8,%esp
d3: 68 24 09 00 00 push $0x924
d8: 6a 01 push $0x1
da: e8 48 04 00 00 call 527 <printf>
df: 83 c4 10 add $0x10,%esp
if(pid == 0){
exec("sh", argv);
printf(1, "init: exec sh failed\n");
exit();
}
while((wpid=wait()) >= 0 && wpid != pid)
e2: e8 a9 02 00 00 call 390 <wait>
e7: 89 45 f0 mov %eax,-0x10(%ebp)
ea: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
ee: 0f 88 73 ff ff ff js 67 <main+0x67>
f4: 8b 45 f0 mov -0x10(%ebp),%eax
f7: 3b 45 f4 cmp -0xc(%ebp),%eax
fa: 75 d4 jne d0 <main+0xd0>
printf(1, "zombie!\n");
}
fc: e9 66 ff ff ff jmp 67 <main+0x67>
00000101 <stosb>:
"cc");
}
static inline void
stosb(void *addr, int data, int cnt)
{
101: 55 push %ebp
102: 89 e5 mov %esp,%ebp
104: 57 push %edi
105: 53 push %ebx
asm volatile("cld; rep stosb" :
106: 8b 4d 08 mov 0x8(%ebp),%ecx
109: 8b 55 10 mov 0x10(%ebp),%edx
10c: 8b 45 0c mov 0xc(%ebp),%eax
10f: 89 cb mov %ecx,%ebx
111: 89 df mov %ebx,%edi
113: 89 d1 mov %edx,%ecx
115: fc cld
116: f3 aa rep stos %al,%es:(%edi)
118: 89 ca mov %ecx,%edx
11a: 89 fb mov %edi,%ebx
11c: 89 5d 08 mov %ebx,0x8(%ebp)
11f: 89 55 10 mov %edx,0x10(%ebp)
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
122: 90 nop
123: 5b pop %ebx
124: 5f pop %edi
125: 5d pop %ebp
126: c3 ret
00000127 <strcpy>:
#include "user.h"
#include "x86.h"
char*
strcpy(char *s, char *t)
{
127: 55 push %ebp
128: 89 e5 mov %esp,%ebp
12a: 83 ec 10 sub $0x10,%esp
char *os;
os = s;
12d: 8b 45 08 mov 0x8(%ebp),%eax
130: 89 45 fc mov %eax,-0x4(%ebp)
while((*s++ = *t++) != 0)
133: 90 nop
134: 8b 45 08 mov 0x8(%ebp),%eax
137: 8d 50 01 lea 0x1(%eax),%edx
13a: 89 55 08 mov %edx,0x8(%ebp)
13d: 8b 55 0c mov 0xc(%ebp),%edx
140: 8d 4a 01 lea 0x1(%edx),%ecx
143: 89 4d 0c mov %ecx,0xc(%ebp)
146: 0f b6 12 movzbl (%edx),%edx
149: 88 10 mov %dl,(%eax)
14b: 0f b6 00 movzbl (%eax),%eax
14e: 84 c0 test %al,%al
150: 75 e2 jne 134 <strcpy+0xd>
;
return os;
152: 8b 45 fc mov -0x4(%ebp),%eax
}
155: c9 leave
156: c3 ret
00000157 <strcmp>:
int
strcmp(const char *p, const char *q)
{
157: 55 push %ebp
158: 89 e5 mov %esp,%ebp
while(*p && *p == *q)
15a: eb 08 jmp 164 <strcmp+0xd>
p++, q++;
15c: 83 45 08 01 addl $0x1,0x8(%ebp)
160: 83 45 0c 01 addl $0x1,0xc(%ebp)
}
int
strcmp(const char *p, const char *q)
{
while(*p && *p == *q)
164: 8b 45 08 mov 0x8(%ebp),%eax
167: 0f b6 00 movzbl (%eax),%eax
16a: 84 c0 test %al,%al
16c: 74 10 je 17e <strcmp+0x27>
16e: 8b 45 08 mov 0x8(%ebp),%eax
171: 0f b6 10 movzbl (%eax),%edx
174: 8b 45 0c mov 0xc(%ebp),%eax
177: 0f b6 00 movzbl (%eax),%eax
17a: 38 c2 cmp %al,%dl
17c: 74 de je 15c <strcmp+0x5>
p++, q++;
return (uchar)*p - (uchar)*q;
17e: 8b 45 08 mov 0x8(%ebp),%eax
181: 0f b6 00 movzbl (%eax),%eax
184: 0f b6 d0 movzbl %al,%edx
187: 8b 45 0c mov 0xc(%ebp),%eax
18a: 0f b6 00 movzbl (%eax),%eax
18d: 0f b6 c0 movzbl %al,%eax
190: 29 c2 sub %eax,%edx
192: 89 d0 mov %edx,%eax
}
194: 5d pop %ebp
195: c3 ret
00000196 <strlen>:
uint
strlen(char *s)
{
196: 55 push %ebp
197: 89 e5 mov %esp,%ebp
199: 83 ec 10 sub $0x10,%esp
int n;
for(n = 0; s[n]; n++)
19c: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
1a3: eb 04 jmp 1a9 <strlen+0x13>
1a5: 83 45 fc 01 addl $0x1,-0x4(%ebp)
1a9: 8b 55 fc mov -0x4(%ebp),%edx
1ac: 8b 45 08 mov 0x8(%ebp),%eax
1af: 01 d0 add %edx,%eax
1b1: 0f b6 00 movzbl (%eax),%eax
1b4: 84 c0 test %al,%al
1b6: 75 ed jne 1a5 <strlen+0xf>
;
return n;
1b8: 8b 45 fc mov -0x4(%ebp),%eax
}
1bb: c9 leave
1bc: c3 ret
000001bd <memset>:
void*
memset(void *dst, int c, uint n)
{
1bd: 55 push %ebp
1be: 89 e5 mov %esp,%ebp
stosb(dst, c, n);
1c0: 8b 45 10 mov 0x10(%ebp),%eax
1c3: 50 push %eax
1c4: ff 75 0c pushl 0xc(%ebp)
1c7: ff 75 08 pushl 0x8(%ebp)
1ca: e8 32 ff ff ff call 101 <stosb>
1cf: 83 c4 0c add $0xc,%esp
return dst;
1d2: 8b 45 08 mov 0x8(%ebp),%eax
}
1d5: c9 leave
1d6: c3 ret
000001d7 <strchr>:
char*
strchr(const char *s, char c)
{
1d7: 55 push %ebp
1d8: 89 e5 mov %esp,%ebp
1da: 83 ec 04 sub $0x4,%esp
1dd: 8b 45 0c mov 0xc(%ebp),%eax
1e0: 88 45 fc mov %al,-0x4(%ebp)
for(; *s; s++)
1e3: eb 14 jmp 1f9 <strchr+0x22>
if(*s == c)
1e5: 8b 45 08 mov 0x8(%ebp),%eax
1e8: 0f b6 00 movzbl (%eax),%eax
1eb: 3a 45 fc cmp -0x4(%ebp),%al
1ee: 75 05 jne 1f5 <strchr+0x1e>
return (char*)s;
1f0: 8b 45 08 mov 0x8(%ebp),%eax
1f3: eb 13 jmp 208 <strchr+0x31>
}
char*
strchr(const char *s, char c)
{
for(; *s; s++)
1f5: 83 45 08 01 addl $0x1,0x8(%ebp)
1f9: 8b 45 08 mov 0x8(%ebp),%eax
1fc: 0f b6 00 movzbl (%eax),%eax
1ff: 84 c0 test %al,%al
201: 75 e2 jne 1e5 <strchr+0xe>
if(*s == c)
return (char*)s;
return 0;
203: b8 00 00 00 00 mov $0x0,%eax
}
208: c9 leave
209: c3 ret
0000020a <gets>:
char*
gets(char *buf, int max)
{
20a: 55 push %ebp
20b: 89 e5 mov %esp,%ebp
20d: 83 ec 18 sub $0x18,%esp
int i, cc;
char c;
for(i=0; i+1 < max; ){
210: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
217: eb 42 jmp 25b <gets+0x51>
cc = read(0, &c, 1);
219: 83 ec 04 sub $0x4,%esp
21c: 6a 01 push $0x1
21e: 8d 45 ef lea -0x11(%ebp),%eax
221: 50 push %eax
222: 6a 00 push $0x0
224: e8 77 01 00 00 call 3a0 <read>
229: 83 c4 10 add $0x10,%esp
22c: 89 45 f0 mov %eax,-0x10(%ebp)
if(cc < 1)
22f: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
233: 7e 33 jle 268 <gets+0x5e>
break;
buf[i++] = c;
235: 8b 45 f4 mov -0xc(%ebp),%eax
238: 8d 50 01 lea 0x1(%eax),%edx
23b: 89 55 f4 mov %edx,-0xc(%ebp)
23e: 89 c2 mov %eax,%edx
240: 8b 45 08 mov 0x8(%ebp),%eax
243: 01 c2 add %eax,%edx
245: 0f b6 45 ef movzbl -0x11(%ebp),%eax
249: 88 02 mov %al,(%edx)
if(c == '\n' || c == '\r')
24b: 0f b6 45 ef movzbl -0x11(%ebp),%eax
24f: 3c 0a cmp $0xa,%al
251: 74 16 je 269 <gets+0x5f>
253: 0f b6 45 ef movzbl -0x11(%ebp),%eax
257: 3c 0d cmp $0xd,%al
259: 74 0e je 269 <gets+0x5f>
gets(char *buf, int max)
{
int i, cc;
char c;
for(i=0; i+1 < max; ){
25b: 8b 45 f4 mov -0xc(%ebp),%eax
25e: 83 c0 01 add $0x1,%eax
261: 3b 45 0c cmp 0xc(%ebp),%eax
264: 7c b3 jl 219 <gets+0xf>
266: eb 01 jmp 269 <gets+0x5f>
cc = read(0, &c, 1);
if(cc < 1)
break;
268: 90 nop
buf[i++] = c;
if(c == '\n' || c == '\r')
break;
}
buf[i] = '\0';
269: 8b 55 f4 mov -0xc(%ebp),%edx
26c: 8b 45 08 mov 0x8(%ebp),%eax
26f: 01 d0 add %edx,%eax
271: c6 00 00 movb $0x0,(%eax)
return buf;
274: 8b 45 08 mov 0x8(%ebp),%eax
}
277: c9 leave
278: c3 ret
00000279 <stat>:
int
stat(char *n, struct stat *st)
{
279: 55 push %ebp
27a: 89 e5 mov %esp,%ebp
27c: 83 ec 18 sub $0x18,%esp
int fd;
int r;
fd = open(n, O_RDONLY);
27f: 83 ec 08 sub $0x8,%esp
282: 6a 00 push $0x0
284: ff 75 08 pushl 0x8(%ebp)
287: e8 3c 01 00 00 call 3c8 <open>
28c: 83 c4 10 add $0x10,%esp
28f: 89 45 f4 mov %eax,-0xc(%ebp)
if(fd < 0)
292: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
296: 79 07 jns 29f <stat+0x26>
return -1;
298: b8 ff ff ff ff mov $0xffffffff,%eax
29d: eb 25 jmp 2c4 <stat+0x4b>
r = fstat(fd, st);
29f: 83 ec 08 sub $0x8,%esp
2a2: ff 75 0c pushl 0xc(%ebp)
2a5: ff 75 f4 pushl -0xc(%ebp)
2a8: e8 33 01 00 00 call 3e0 <fstat>
2ad: 83 c4 10 add $0x10,%esp
2b0: 89 45 f0 mov %eax,-0x10(%ebp)
close(fd);
2b3: 83 ec 0c sub $0xc,%esp
2b6: ff 75 f4 pushl -0xc(%ebp)
2b9: e8 f2 00 00 00 call 3b0 <close>
2be: 83 c4 10 add $0x10,%esp
return r;
2c1: 8b 45 f0 mov -0x10(%ebp),%eax
}
2c4: c9 leave
2c5: c3 ret
000002c6 <atoi>:
int
atoi(const char *s)
{
2c6: 55 push %ebp
2c7: 89 e5 mov %esp,%ebp
2c9: 83 ec 10 sub $0x10,%esp
int n;
n = 0;
2cc: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
while('0' <= *s && *s <= '9')
2d3: eb 25 jmp 2fa <atoi+0x34>
n = n*10 + *s++ - '0';
2d5: 8b 55 fc mov -0x4(%ebp),%edx
2d8: 89 d0 mov %edx,%eax
2da: c1 e0 02 shl $0x2,%eax
2dd: 01 d0 add %edx,%eax
2df: 01 c0 add %eax,%eax
2e1: 89 c1 mov %eax,%ecx
2e3: 8b 45 08 mov 0x8(%ebp),%eax
2e6: 8d 50 01 lea 0x1(%eax),%edx
2e9: 89 55 08 mov %edx,0x8(%ebp)
2ec: 0f b6 00 movzbl (%eax),%eax
2ef: 0f be c0 movsbl %al,%eax
2f2: 01 c8 add %ecx,%eax
2f4: 83 e8 30 sub $0x30,%eax
2f7: 89 45 fc mov %eax,-0x4(%ebp)
atoi(const char *s)
{
int n;
n = 0;
while('0' <= *s && *s <= '9')
2fa: 8b 45 08 mov 0x8(%ebp),%eax
2fd: 0f b6 00 movzbl (%eax),%eax
300: 3c 2f cmp $0x2f,%al
302: 7e 0a jle 30e <atoi+0x48>
304: 8b 45 08 mov 0x8(%ebp),%eax
307: 0f b6 00 movzbl (%eax),%eax
30a: 3c 39 cmp $0x39,%al
30c: 7e c7 jle 2d5 <atoi+0xf>
n = n*10 + *s++ - '0';
return n;
30e: 8b 45 fc mov -0x4(%ebp),%eax
}
311: c9 leave
312: c3 ret
00000313 <memmove>:
void*
memmove(void *vdst, void *vsrc, int n)
{
313: 55 push %ebp
314: 89 e5 mov %esp,%ebp
316: 83 ec 10 sub $0x10,%esp
char *dst, *src;
dst = vdst;
319: 8b 45 08 mov 0x8(%ebp),%eax
31c: 89 45 fc mov %eax,-0x4(%ebp)
src = vsrc;
31f: 8b 45 0c mov 0xc(%ebp),%eax
322: 89 45 f8 mov %eax,-0x8(%ebp)
while(n-- > 0)
325: eb 17 jmp 33e <memmove+0x2b>
*dst++ = *src++;
327: 8b 45 fc mov -0x4(%ebp),%eax
32a: 8d 50 01 lea 0x1(%eax),%edx
32d: 89 55 fc mov %edx,-0x4(%ebp)
330: 8b 55 f8 mov -0x8(%ebp),%edx
333: 8d 4a 01 lea 0x1(%edx),%ecx
336: 89 4d f8 mov %ecx,-0x8(%ebp)
339: 0f b6 12 movzbl (%edx),%edx
33c: 88 10 mov %dl,(%eax)
{
char *dst, *src;
dst = vdst;
src = vsrc;
while(n-- > 0)
33e: 8b 45 10 mov 0x10(%ebp),%eax
341: 8d 50 ff lea -0x1(%eax),%edx
344: 89 55 10 mov %edx,0x10(%ebp)
347: 85 c0 test %eax,%eax
349: 7f dc jg 327 <memmove+0x14>
*dst++ = *src++;
return vdst;
34b: 8b 45 08 mov 0x8(%ebp),%eax
}
34e: c9 leave
34f: c3 ret
00000350 <restorer>:
350: 83 c4 0c add $0xc,%esp
353: 5a pop %edx
354: 59 pop %ecx
355: 58 pop %eax
356: c3 ret
00000357 <signal>:
"pop %ecx\n\t"
"pop %eax\n\t"
"ret\n\t");
int signal(int signum, void(*handler)(int))
{
357: 55 push %ebp
358: 89 e5 mov %esp,%ebp
35a: 83 ec 08 sub $0x8,%esp
signal_restorer(restorer);
35d: 83 ec 0c sub $0xc,%esp
360: 68 50 03 00 00 push $0x350
365: e8 ce 00 00 00 call 438 <signal_restorer>
36a: 83 c4 10 add $0x10,%esp
return signal_register(signum, handler);
36d: 83 ec 08 sub $0x8,%esp
370: ff 75 0c pushl 0xc(%ebp)
373: ff 75 08 pushl 0x8(%ebp)
376: e8 b5 00 00 00 call 430 <signal_register>
37b: 83 c4 10 add $0x10,%esp
}
37e: c9 leave
37f: c3 ret
00000380 <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
380: b8 01 00 00 00 mov $0x1,%eax
385: cd 40 int $0x40
387: c3 ret
00000388 <exit>:
SYSCALL(exit)
388: b8 02 00 00 00 mov $0x2,%eax
38d: cd 40 int $0x40
38f: c3 ret
00000390 <wait>:
SYSCALL(wait)
390: b8 03 00 00 00 mov $0x3,%eax
395: cd 40 int $0x40
397: c3 ret
00000398 <pipe>:
SYSCALL(pipe)
398: b8 04 00 00 00 mov $0x4,%eax
39d: cd 40 int $0x40
39f: c3 ret
000003a0 <read>:
SYSCALL(read)
3a0: b8 05 00 00 00 mov $0x5,%eax
3a5: cd 40 int $0x40
3a7: c3 ret
000003a8 <write>:
SYSCALL(write)
3a8: b8 10 00 00 00 mov $0x10,%eax
3ad: cd 40 int $0x40
3af: c3 ret
000003b0 <close>:
SYSCALL(close)
3b0: b8 15 00 00 00 mov $0x15,%eax
3b5: cd 40 int $0x40
3b7: c3 ret
000003b8 <kill>:
SYSCALL(kill)
3b8: b8 06 00 00 00 mov $0x6,%eax
3bd: cd 40 int $0x40
3bf: c3 ret
000003c0 <exec>:
SYSCALL(exec)
3c0: b8 07 00 00 00 mov $0x7,%eax
3c5: cd 40 int $0x40
3c7: c3 ret
000003c8 <open>:
SYSCALL(open)
3c8: b8 0f 00 00 00 mov $0xf,%eax
3cd: cd 40 int $0x40
3cf: c3 ret
000003d0 <mknod>:
SYSCALL(mknod)
3d0: b8 11 00 00 00 mov $0x11,%eax
3d5: cd 40 int $0x40
3d7: c3 ret
000003d8 <unlink>:
SYSCALL(unlink)
3d8: b8 12 00 00 00 mov $0x12,%eax
3dd: cd 40 int $0x40
3df: c3 ret
000003e0 <fstat>:
SYSCALL(fstat)
3e0: b8 08 00 00 00 mov $0x8,%eax
3e5: cd 40 int $0x40
3e7: c3 ret
000003e8 <link>:
SYSCALL(link)
3e8: b8 13 00 00 00 mov $0x13,%eax
3ed: cd 40 int $0x40
3ef: c3 ret
000003f0 <mkdir>:
SYSCALL(mkdir)
3f0: b8 14 00 00 00 mov $0x14,%eax
3f5: cd 40 int $0x40
3f7: c3 ret
000003f8 <chdir>:
SYSCALL(chdir)
3f8: b8 09 00 00 00 mov $0x9,%eax
3fd: cd 40 int $0x40
3ff: c3 ret
00000400 <dup>:
SYSCALL(dup)
400: b8 0a 00 00 00 mov $0xa,%eax
405: cd 40 int $0x40
407: c3 ret
00000408 <getpid>:
SYSCALL(getpid)
408: b8 0b 00 00 00 mov $0xb,%eax
40d: cd 40 int $0x40
40f: c3 ret
00000410 <sbrk>:
SYSCALL(sbrk)
410: b8 0c 00 00 00 mov $0xc,%eax
415: cd 40 int $0x40
417: c3 ret
00000418 <sleep>:
SYSCALL(sleep)
418: b8 0d 00 00 00 mov $0xd,%eax
41d: cd 40 int $0x40
41f: c3 ret
00000420 <uptime>:
SYSCALL(uptime)
420: b8 0e 00 00 00 mov $0xe,%eax
425: cd 40 int $0x40
427: c3 ret
00000428 <halt>:
SYSCALL(halt)
428: b8 16 00 00 00 mov $0x16,%eax
42d: cd 40 int $0x40
42f: c3 ret
00000430 <signal_register>:
SYSCALL(signal_register)
430: b8 17 00 00 00 mov $0x17,%eax
435: cd 40 int $0x40
437: c3 ret
00000438 <signal_restorer>:
SYSCALL(signal_restorer)
438: b8 18 00 00 00 mov $0x18,%eax
43d: cd 40 int $0x40
43f: c3 ret
00000440 <mprotect>:
SYSCALL(mprotect)
440: b8 19 00 00 00 mov $0x19,%eax
445: cd 40 int $0x40
447: c3 ret
00000448 <cowfork>:
SYSCALL(cowfork)
448: b8 1a 00 00 00 mov $0x1a,%eax
44d: cd 40 int $0x40
44f: c3 ret
00000450 <putc>:
#include "stat.h"
#include "user.h"
static void
putc(int fd, char c)
{
450: 55 push %ebp
451: 89 e5 mov %esp,%ebp
453: 83 ec 18 sub $0x18,%esp
456: 8b 45 0c mov 0xc(%ebp),%eax
459: 88 45 f4 mov %al,-0xc(%ebp)
write(fd, &c, 1);
45c: 83 ec 04 sub $0x4,%esp
45f: 6a 01 push $0x1
461: 8d 45 f4 lea -0xc(%ebp),%eax
464: 50 push %eax
465: ff 75 08 pushl 0x8(%ebp)
468: e8 3b ff ff ff call 3a8 <write>
46d: 83 c4 10 add $0x10,%esp
}
470: 90 nop
471: c9 leave
472: c3 ret
00000473 <printint>:
static void
printint(int fd, int xx, int base, int sgn)
{
473: 55 push %ebp
474: 89 e5 mov %esp,%ebp
476: 53 push %ebx
477: 83 ec 24 sub $0x24,%esp
static char digits[] = "0123456789ABCDEF";
char buf[16];
int i, neg;
uint x;
neg = 0;
47a: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
if(sgn && xx < 0){
481: 83 7d 14 00 cmpl $0x0,0x14(%ebp)
485: 74 17 je 49e <printint+0x2b>
487: 83 7d 0c 00 cmpl $0x0,0xc(%ebp)
48b: 79 11 jns 49e <printint+0x2b>
neg = 1;
48d: c7 45 f0 01 00 00 00 movl $0x1,-0x10(%ebp)
x = -xx;
494: 8b 45 0c mov 0xc(%ebp),%eax
497: f7 d8 neg %eax
499: 89 45 ec mov %eax,-0x14(%ebp)
49c: eb 06 jmp 4a4 <printint+0x31>
} else {
x = xx;
49e: 8b 45 0c mov 0xc(%ebp),%eax
4a1: 89 45 ec mov %eax,-0x14(%ebp)
}
i = 0;
4a4: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
do{
buf[i++] = digits[x % base];
4ab: 8b 4d f4 mov -0xc(%ebp),%ecx
4ae: 8d 41 01 lea 0x1(%ecx),%eax
4b1: 89 45 f4 mov %eax,-0xc(%ebp)
4b4: 8b 5d 10 mov 0x10(%ebp),%ebx
4b7: 8b 45 ec mov -0x14(%ebp),%eax
4ba: ba 00 00 00 00 mov $0x0,%edx
4bf: f7 f3 div %ebx
4c1: 89 d0 mov %edx,%eax
4c3: 0f b6 80 a4 0b 00 00 movzbl 0xba4(%eax),%eax
4ca: 88 44 0d dc mov %al,-0x24(%ebp,%ecx,1)
}while((x /= base) != 0);
4ce: 8b 5d 10 mov 0x10(%ebp),%ebx
4d1: 8b 45 ec mov -0x14(%ebp),%eax
4d4: ba 00 00 00 00 mov $0x0,%edx
4d9: f7 f3 div %ebx
4db: 89 45 ec mov %eax,-0x14(%ebp)
4de: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
4e2: 75 c7 jne 4ab <printint+0x38>
if(neg)
4e4: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
4e8: 74 2d je 517 <printint+0xa4>
buf[i++] = '-';
4ea: 8b 45 f4 mov -0xc(%ebp),%eax
4ed: 8d 50 01 lea 0x1(%eax),%edx
4f0: 89 55 f4 mov %edx,-0xc(%ebp)
4f3: c6 44 05 dc 2d movb $0x2d,-0x24(%ebp,%eax,1)
while(--i >= 0)
4f8: eb 1d jmp 517 <printint+0xa4>
putc(fd, buf[i]);
4fa: 8d 55 dc lea -0x24(%ebp),%edx
4fd: 8b 45 f4 mov -0xc(%ebp),%eax
500: 01 d0 add %edx,%eax
502: 0f b6 00 movzbl (%eax),%eax
505: 0f be c0 movsbl %al,%eax
508: 83 ec 08 sub $0x8,%esp
50b: 50 push %eax
50c: ff 75 08 pushl 0x8(%ebp)
50f: e8 3c ff ff ff call 450 <putc>
514: 83 c4 10 add $0x10,%esp
buf[i++] = digits[x % base];
}while((x /= base) != 0);
if(neg)
buf[i++] = '-';
while(--i >= 0)
517: 83 6d f4 01 subl $0x1,-0xc(%ebp)
51b: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
51f: 79 d9 jns 4fa <printint+0x87>
putc(fd, buf[i]);
}
521: 90 nop
522: 8b 5d fc mov -0x4(%ebp),%ebx
525: c9 leave
526: c3 ret
00000527 <printf>:
// Print to the given fd. Only understands %d, %x, %p, %s.
void
printf(int fd, char *fmt, ...)
{
527: 55 push %ebp
528: 89 e5 mov %esp,%ebp
52a: 83 ec 28 sub $0x28,%esp
char *s;
int c, i, state;
uint *ap;
state = 0;
52d: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%ebp)
ap = (uint*)(void*)&fmt + 1;
534: 8d 45 0c lea 0xc(%ebp),%eax
537: 83 c0 04 add $0x4,%eax
53a: 89 45 e8 mov %eax,-0x18(%ebp)
for(i = 0; fmt[i]; i++){
53d: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
544: e9 59 01 00 00 jmp 6a2 <printf+0x17b>
c = fmt[i] & 0xff;
549: 8b 55 0c mov 0xc(%ebp),%edx
54c: 8b 45 f0 mov -0x10(%ebp),%eax
54f: 01 d0 add %edx,%eax
551: 0f b6 00 movzbl (%eax),%eax
554: 0f be c0 movsbl %al,%eax
557: 25 ff 00 00 00 and $0xff,%eax
55c: 89 45 e4 mov %eax,-0x1c(%ebp)
if(state == 0){
55f: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
563: 75 2c jne 591 <printf+0x6a>
if(c == '%'){
565: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
569: 75 0c jne 577 <printf+0x50>
state = '%';
56b: c7 45 ec 25 00 00 00 movl $0x25,-0x14(%ebp)
572: e9 27 01 00 00 jmp 69e <printf+0x177>
} else {
putc(fd, c);
577: 8b 45 e4 mov -0x1c(%ebp),%eax
57a: 0f be c0 movsbl %al,%eax
57d: 83 ec 08 sub $0x8,%esp
580: 50 push %eax
581: ff 75 08 pushl 0x8(%ebp)
584: e8 c7 fe ff ff call 450 <putc>
589: 83 c4 10 add $0x10,%esp
58c: e9 0d 01 00 00 jmp 69e <printf+0x177>
}
} else if(state == '%'){
591: 83 7d ec 25 cmpl $0x25,-0x14(%ebp)
595: 0f 85 03 01 00 00 jne 69e <printf+0x177>
if(c == 'd'){
59b: 83 7d e4 64 cmpl $0x64,-0x1c(%ebp)
59f: 75 1e jne 5bf <printf+0x98>
printint(fd, *ap, 10, 1);
5a1: 8b 45 e8 mov -0x18(%ebp),%eax
5a4: 8b 00 mov (%eax),%eax
5a6: 6a 01 push $0x1
5a8: 6a 0a push $0xa
5aa: 50 push %eax
5ab: ff 75 08 pushl 0x8(%ebp)
5ae: e8 c0 fe ff ff call 473 <printint>
5b3: 83 c4 10 add $0x10,%esp
ap++;
5b6: 83 45 e8 04 addl $0x4,-0x18(%ebp)
5ba: e9 d8 00 00 00 jmp 697 <printf+0x170>
} else if(c == 'x' || c == 'p'){
5bf: 83 7d e4 78 cmpl $0x78,-0x1c(%ebp)
5c3: 74 06 je 5cb <printf+0xa4>
5c5: 83 7d e4 70 cmpl $0x70,-0x1c(%ebp)
5c9: 75 1e jne 5e9 <printf+0xc2>
printint(fd, *ap, 16, 0);
5cb: 8b 45 e8 mov -0x18(%ebp),%eax
5ce: 8b 00 mov (%eax),%eax
5d0: 6a 00 push $0x0
5d2: 6a 10 push $0x10
5d4: 50 push %eax
5d5: ff 75 08 pushl 0x8(%ebp)
5d8: e8 96 fe ff ff call 473 <printint>
5dd: 83 c4 10 add $0x10,%esp
ap++;
5e0: 83 45 e8 04 addl $0x4,-0x18(%ebp)
5e4: e9 ae 00 00 00 jmp 697 <printf+0x170>
} else if(c == 's'){
5e9: 83 7d e4 73 cmpl $0x73,-0x1c(%ebp)
5ed: 75 43 jne 632 <printf+0x10b>
s = (char*)*ap;
5ef: 8b 45 e8 mov -0x18(%ebp),%eax
5f2: 8b 00 mov (%eax),%eax
5f4: 89 45 f4 mov %eax,-0xc(%ebp)
ap++;
5f7: 83 45 e8 04 addl $0x4,-0x18(%ebp)
if(s == 0)
5fb: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
5ff: 75 25 jne 626 <printf+0xff>
s = "(null)";
601: c7 45 f4 2d 09 00 00 movl $0x92d,-0xc(%ebp)
while(*s != 0){
608: eb 1c jmp 626 <printf+0xff>
putc(fd, *s);
60a: 8b 45 f4 mov -0xc(%ebp),%eax
60d: 0f b6 00 movzbl (%eax),%eax
610: 0f be c0 movsbl %al,%eax
613: 83 ec 08 sub $0x8,%esp
616: 50 push %eax
617: ff 75 08 pushl 0x8(%ebp)
61a: e8 31 fe ff ff call 450 <putc>
61f: 83 c4 10 add $0x10,%esp
s++;
622: 83 45 f4 01 addl $0x1,-0xc(%ebp)
} else if(c == 's'){
s = (char*)*ap;
ap++;
if(s == 0)
s = "(null)";
while(*s != 0){
626: 8b 45 f4 mov -0xc(%ebp),%eax
629: 0f b6 00 movzbl (%eax),%eax
62c: 84 c0 test %al,%al
62e: 75 da jne 60a <printf+0xe3>
630: eb 65 jmp 697 <printf+0x170>
putc(fd, *s);
s++;
}
} else if(c == 'c'){
632: 83 7d e4 63 cmpl $0x63,-0x1c(%ebp)
636: 75 1d jne 655 <printf+0x12e>
putc(fd, *ap);
638: 8b 45 e8 mov -0x18(%ebp),%eax
63b: 8b 00 mov (%eax),%eax
63d: 0f be c0 movsbl %al,%eax
640: 83 ec 08 sub $0x8,%esp
643: 50 push %eax
644: ff 75 08 pushl 0x8(%ebp)
647: e8 04 fe ff ff call 450 <putc>
64c: 83 c4 10 add $0x10,%esp
ap++;
64f: 83 45 e8 04 addl $0x4,-0x18(%ebp)
653: eb 42 jmp 697 <printf+0x170>
} else if(c == '%'){
655: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
659: 75 17 jne 672 <printf+0x14b>
putc(fd, c);
65b: 8b 45 e4 mov -0x1c(%ebp),%eax
65e: 0f be c0 movsbl %al,%eax
661: 83 ec 08 sub $0x8,%esp
664: 50 push %eax
665: ff 75 08 pushl 0x8(%ebp)
668: e8 e3 fd ff ff call 450 <putc>
66d: 83 c4 10 add $0x10,%esp
670: eb 25 jmp 697 <printf+0x170>
} else {
// Unknown % sequence. Print it to draw attention.
putc(fd, '%');
672: 83 ec 08 sub $0x8,%esp
675: 6a 25 push $0x25
677: ff 75 08 pushl 0x8(%ebp)
67a: e8 d1 fd ff ff call 450 <putc>
67f: 83 c4 10 add $0x10,%esp
putc(fd, c);