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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;
printf(1,"before open \n");
11: 83 ec 08 sub $0x8,%esp
14: 68 a2 08 00 00 push $0x8a2
19: 6a 01 push $0x1
1b: e8 c9 04 00 00 call 4e9 <printf>
20: 83 c4 10 add $0x10,%esp
if(open("console", O_RDWR) < 0){
23: 83 ec 08 sub $0x8,%esp
26: 6a 02 push $0x2
28: 68 b0 08 00 00 push $0x8b0
2d: e8 78 03 00 00 call 3aa <open>
32: 83 c4 10 add $0x10,%esp
35: 85 c0 test %eax,%eax
37: 79 26 jns 5f <main+0x5f>
// printf(1,"after open \n");
mknod("console", 1, 1);
39: 83 ec 04 sub $0x4,%esp
3c: 6a 01 push $0x1
3e: 6a 01 push $0x1
40: 68 b0 08 00 00 push $0x8b0
45: e8 68 03 00 00 call 3b2 <mknod>
4a: 83 c4 10 add $0x10,%esp
// printf(1,"after mknod \n");
open("console", O_RDWR);
4d: 83 ec 08 sub $0x8,%esp
50: 6a 02 push $0x2
52: 68 b0 08 00 00 push $0x8b0
57: e8 4e 03 00 00 call 3aa <open>
5c: 83 c4 10 add $0x10,%esp
// printf(1,"after open 2\n");
}
dup(0); // stdout
5f: 83 ec 0c sub $0xc,%esp
62: 6a 00 push $0x0
64: e8 79 03 00 00 call 3e2 <dup>
69: 83 c4 10 add $0x10,%esp
dup(0); // stderr
6c: 83 ec 0c sub $0xc,%esp
6f: 6a 00 push $0x0
71: e8 6c 03 00 00 call 3e2 <dup>
76: 83 c4 10 add $0x10,%esp
for(;;){
printf(1, "init: starting sh\n");
79: 83 ec 08 sub $0x8,%esp
7c: 68 b8 08 00 00 push $0x8b8
81: 6a 01 push $0x1
83: e8 61 04 00 00 call 4e9 <printf>
88: 83 c4 10 add $0x10,%esp
pid = fork();
8b: e8 d2 02 00 00 call 362 <fork>
90: 89 45 f4 mov %eax,-0xc(%ebp)
if(pid < 0){
93: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
97: 79 17 jns b0 <main+0xb0>
printf(1, "init: fork failed\n");
99: 83 ec 08 sub $0x8,%esp
9c: 68 cb 08 00 00 push $0x8cb
a1: 6a 01 push $0x1
a3: e8 41 04 00 00 call 4e9 <printf>
a8: 83 c4 10 add $0x10,%esp
exit();
ab: e8 ba 02 00 00 call 36a <exit>
}
if(pid == 0){
b0: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
b4: 75 3e jne f4 <main+0xf4>
exec("sh", argv);
b6: 83 ec 08 sub $0x8,%esp
b9: 68 4c 0b 00 00 push $0xb4c
be: 68 9f 08 00 00 push $0x89f
c3: e8 da 02 00 00 call 3a2 <exec>
c8: 83 c4 10 add $0x10,%esp
printf(1, "init: exec sh failed\n");
cb: 83 ec 08 sub $0x8,%esp
ce: 68 de 08 00 00 push $0x8de
d3: 6a 01 push $0x1
d5: e8 0f 04 00 00 call 4e9 <printf>
da: 83 c4 10 add $0x10,%esp
exit();
dd: e8 88 02 00 00 call 36a <exit>
}
while((wpid=wait()) >= 0 && wpid != pid)
printf(1, "zombie!\n");
e2: 83 ec 08 sub $0x8,%esp
e5: 68 f4 08 00 00 push $0x8f4
ea: 6a 01 push $0x1
ec: e8 f8 03 00 00 call 4e9 <printf>
f1: 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)
f4: e8 79 02 00 00 call 372 <wait>
f9: 89 45 f0 mov %eax,-0x10(%ebp)
fc: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
100: 0f 88 73 ff ff ff js 79 <main+0x79>
106: 8b 45 f0 mov -0x10(%ebp),%eax
109: 3b 45 f4 cmp -0xc(%ebp),%eax
10c: 75 d4 jne e2 <main+0xe2>
printf(1, "zombie!\n");
}
10e: e9 66 ff ff ff jmp 79 <main+0x79>
00000113 <stosb>:
"cc");
}
static inline void
stosb(void *addr, int data, int cnt)
{
113: 55 push %ebp
114: 89 e5 mov %esp,%ebp
116: 57 push %edi
117: 53 push %ebx
asm volatile("cld; rep stosb" :
118: 8b 4d 08 mov 0x8(%ebp),%ecx
11b: 8b 55 10 mov 0x10(%ebp),%edx
11e: 8b 45 0c mov 0xc(%ebp),%eax
121: 89 cb mov %ecx,%ebx
123: 89 df mov %ebx,%edi
125: 89 d1 mov %edx,%ecx
127: fc cld
128: f3 aa rep stos %al,%es:(%edi)
12a: 89 ca mov %ecx,%edx
12c: 89 fb mov %edi,%ebx
12e: 89 5d 08 mov %ebx,0x8(%ebp)
131: 89 55 10 mov %edx,0x10(%ebp)
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
134: 90 nop
135: 5b pop %ebx
136: 5f pop %edi
137: 5d pop %ebp
138: c3 ret
00000139 <strcpy>:
#include "user.h"
#include "x86.h"
char*
strcpy(char *s, char *t)
{
139: 55 push %ebp
13a: 89 e5 mov %esp,%ebp
13c: 83 ec 10 sub $0x10,%esp
char *os;
os = s;
13f: 8b 45 08 mov 0x8(%ebp),%eax
142: 89 45 fc mov %eax,-0x4(%ebp)
while((*s++ = *t++) != 0)
145: 90 nop
146: 8b 45 08 mov 0x8(%ebp),%eax
149: 8d 50 01 lea 0x1(%eax),%edx
14c: 89 55 08 mov %edx,0x8(%ebp)
14f: 8b 55 0c mov 0xc(%ebp),%edx
152: 8d 4a 01 lea 0x1(%edx),%ecx
155: 89 4d 0c mov %ecx,0xc(%ebp)
158: 0f b6 12 movzbl (%edx),%edx
15b: 88 10 mov %dl,(%eax)
15d: 0f b6 00 movzbl (%eax),%eax
160: 84 c0 test %al,%al
162: 75 e2 jne 146 <strcpy+0xd>
;
return os;
164: 8b 45 fc mov -0x4(%ebp),%eax
}
167: c9 leave
168: c3 ret
00000169 <strcmp>:
int
strcmp(const char *p, const char *q)
{
169: 55 push %ebp
16a: 89 e5 mov %esp,%ebp
while(*p && *p == *q)
16c: eb 08 jmp 176 <strcmp+0xd>
p++, q++;
16e: 83 45 08 01 addl $0x1,0x8(%ebp)
172: 83 45 0c 01 addl $0x1,0xc(%ebp)
}
int
strcmp(const char *p, const char *q)
{
while(*p && *p == *q)
176: 8b 45 08 mov 0x8(%ebp),%eax
179: 0f b6 00 movzbl (%eax),%eax
17c: 84 c0 test %al,%al
17e: 74 10 je 190 <strcmp+0x27>
180: 8b 45 08 mov 0x8(%ebp),%eax
183: 0f b6 10 movzbl (%eax),%edx
186: 8b 45 0c mov 0xc(%ebp),%eax
189: 0f b6 00 movzbl (%eax),%eax
18c: 38 c2 cmp %al,%dl
18e: 74 de je 16e <strcmp+0x5>
p++, q++;
return (uchar)*p - (uchar)*q;
190: 8b 45 08 mov 0x8(%ebp),%eax
193: 0f b6 00 movzbl (%eax),%eax
196: 0f b6 d0 movzbl %al,%edx
199: 8b 45 0c mov 0xc(%ebp),%eax
19c: 0f b6 00 movzbl (%eax),%eax
19f: 0f b6 c0 movzbl %al,%eax
1a2: 29 c2 sub %eax,%edx
1a4: 89 d0 mov %edx,%eax
}
1a6: 5d pop %ebp
1a7: c3 ret
000001a8 <strlen>:
uint
strlen(char *s)
{
1a8: 55 push %ebp
1a9: 89 e5 mov %esp,%ebp
1ab: 83 ec 10 sub $0x10,%esp
int n;
for(n = 0; s[n]; n++)
1ae: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
1b5: eb 04 jmp 1bb <strlen+0x13>
1b7: 83 45 fc 01 addl $0x1,-0x4(%ebp)
1bb: 8b 55 fc mov -0x4(%ebp),%edx
1be: 8b 45 08 mov 0x8(%ebp),%eax
1c1: 01 d0 add %edx,%eax
1c3: 0f b6 00 movzbl (%eax),%eax
1c6: 84 c0 test %al,%al
1c8: 75 ed jne 1b7 <strlen+0xf>
;
return n;
1ca: 8b 45 fc mov -0x4(%ebp),%eax
}
1cd: c9 leave
1ce: c3 ret
000001cf <memset>:
void*
memset(void *dst, int c, uint n)
{
1cf: 55 push %ebp
1d0: 89 e5 mov %esp,%ebp
stosb(dst, c, n);
1d2: 8b 45 10 mov 0x10(%ebp),%eax
1d5: 50 push %eax
1d6: ff 75 0c pushl 0xc(%ebp)
1d9: ff 75 08 pushl 0x8(%ebp)
1dc: e8 32 ff ff ff call 113 <stosb>
1e1: 83 c4 0c add $0xc,%esp
return dst;
1e4: 8b 45 08 mov 0x8(%ebp),%eax
}
1e7: c9 leave
1e8: c3 ret
000001e9 <strchr>:
char*
strchr(const char *s, char c)
{
1e9: 55 push %ebp
1ea: 89 e5 mov %esp,%ebp
1ec: 83 ec 04 sub $0x4,%esp
1ef: 8b 45 0c mov 0xc(%ebp),%eax
1f2: 88 45 fc mov %al,-0x4(%ebp)
for(; *s; s++)
1f5: eb 14 jmp 20b <strchr+0x22>
if(*s == c)
1f7: 8b 45 08 mov 0x8(%ebp),%eax
1fa: 0f b6 00 movzbl (%eax),%eax
1fd: 3a 45 fc cmp -0x4(%ebp),%al
200: 75 05 jne 207 <strchr+0x1e>
return (char*)s;
202: 8b 45 08 mov 0x8(%ebp),%eax
205: eb 13 jmp 21a <strchr+0x31>
}
char*
strchr(const char *s, char c)
{
for(; *s; s++)
207: 83 45 08 01 addl $0x1,0x8(%ebp)
20b: 8b 45 08 mov 0x8(%ebp),%eax
20e: 0f b6 00 movzbl (%eax),%eax
211: 84 c0 test %al,%al
213: 75 e2 jne 1f7 <strchr+0xe>
if(*s == c)
return (char*)s;
return 0;
215: b8 00 00 00 00 mov $0x0,%eax
}
21a: c9 leave
21b: c3 ret
0000021c <gets>:
char*
gets(char *buf, int max)
{
21c: 55 push %ebp
21d: 89 e5 mov %esp,%ebp
21f: 83 ec 18 sub $0x18,%esp
int i, cc;
char c;
for(i=0; i+1 < max; ){
222: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
229: eb 42 jmp 26d <gets+0x51>
cc = read(0, &c, 1);
22b: 83 ec 04 sub $0x4,%esp
22e: 6a 01 push $0x1
230: 8d 45 ef lea -0x11(%ebp),%eax
233: 50 push %eax
234: 6a 00 push $0x0
236: e8 47 01 00 00 call 382 <read>
23b: 83 c4 10 add $0x10,%esp
23e: 89 45 f0 mov %eax,-0x10(%ebp)
if(cc < 1)
241: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
245: 7e 33 jle 27a <gets+0x5e>
break;
buf[i++] = c;
247: 8b 45 f4 mov -0xc(%ebp),%eax
24a: 8d 50 01 lea 0x1(%eax),%edx
24d: 89 55 f4 mov %edx,-0xc(%ebp)
250: 89 c2 mov %eax,%edx
252: 8b 45 08 mov 0x8(%ebp),%eax
255: 01 c2 add %eax,%edx
257: 0f b6 45 ef movzbl -0x11(%ebp),%eax
25b: 88 02 mov %al,(%edx)
if(c == '\n' || c == '\r')
25d: 0f b6 45 ef movzbl -0x11(%ebp),%eax
261: 3c 0a cmp $0xa,%al
263: 74 16 je 27b <gets+0x5f>
265: 0f b6 45 ef movzbl -0x11(%ebp),%eax
269: 3c 0d cmp $0xd,%al
26b: 74 0e je 27b <gets+0x5f>
gets(char *buf, int max)
{
int i, cc;
char c;
for(i=0; i+1 < max; ){
26d: 8b 45 f4 mov -0xc(%ebp),%eax
270: 83 c0 01 add $0x1,%eax
273: 3b 45 0c cmp 0xc(%ebp),%eax
276: 7c b3 jl 22b <gets+0xf>
278: eb 01 jmp 27b <gets+0x5f>
cc = read(0, &c, 1);
if(cc < 1)
break;
27a: 90 nop
buf[i++] = c;
if(c == '\n' || c == '\r')
break;
}
buf[i] = '\0';
27b: 8b 55 f4 mov -0xc(%ebp),%edx
27e: 8b 45 08 mov 0x8(%ebp),%eax
281: 01 d0 add %edx,%eax
283: c6 00 00 movb $0x0,(%eax)
return buf;
286: 8b 45 08 mov 0x8(%ebp),%eax
}
289: c9 leave
28a: c3 ret
0000028b <stat>:
int
stat(char *n, struct stat *st)
{
28b: 55 push %ebp
28c: 89 e5 mov %esp,%ebp
28e: 83 ec 18 sub $0x18,%esp
int fd;
int r;
fd = open(n, O_RDONLY);
291: 83 ec 08 sub $0x8,%esp
294: 6a 00 push $0x0
296: ff 75 08 pushl 0x8(%ebp)
299: e8 0c 01 00 00 call 3aa <open>
29e: 83 c4 10 add $0x10,%esp
2a1: 89 45 f4 mov %eax,-0xc(%ebp)
if(fd < 0)
2a4: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
2a8: 79 07 jns 2b1 <stat+0x26>
return -1;
2aa: b8 ff ff ff ff mov $0xffffffff,%eax
2af: eb 25 jmp 2d6 <stat+0x4b>
r = fstat(fd, st);
2b1: 83 ec 08 sub $0x8,%esp
2b4: ff 75 0c pushl 0xc(%ebp)
2b7: ff 75 f4 pushl -0xc(%ebp)
2ba: e8 03 01 00 00 call 3c2 <fstat>
2bf: 83 c4 10 add $0x10,%esp
2c2: 89 45 f0 mov %eax,-0x10(%ebp)
close(fd);
2c5: 83 ec 0c sub $0xc,%esp
2c8: ff 75 f4 pushl -0xc(%ebp)
2cb: e8 c2 00 00 00 call 392 <close>
2d0: 83 c4 10 add $0x10,%esp
return r;
2d3: 8b 45 f0 mov -0x10(%ebp),%eax
}
2d6: c9 leave
2d7: c3 ret
000002d8 <atoi>:
int
atoi(const char *s)
{
2d8: 55 push %ebp
2d9: 89 e5 mov %esp,%ebp
2db: 83 ec 10 sub $0x10,%esp
int n;
n = 0;
2de: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
while('0' <= *s && *s <= '9')
2e5: eb 25 jmp 30c <atoi+0x34>
n = n*10 + *s++ - '0';
2e7: 8b 55 fc mov -0x4(%ebp),%edx
2ea: 89 d0 mov %edx,%eax
2ec: c1 e0 02 shl $0x2,%eax
2ef: 01 d0 add %edx,%eax
2f1: 01 c0 add %eax,%eax
2f3: 89 c1 mov %eax,%ecx
2f5: 8b 45 08 mov 0x8(%ebp),%eax
2f8: 8d 50 01 lea 0x1(%eax),%edx
2fb: 89 55 08 mov %edx,0x8(%ebp)
2fe: 0f b6 00 movzbl (%eax),%eax
301: 0f be c0 movsbl %al,%eax
304: 01 c8 add %ecx,%eax
306: 83 e8 30 sub $0x30,%eax
309: 89 45 fc mov %eax,-0x4(%ebp)
atoi(const char *s)
{
int n;
n = 0;
while('0' <= *s && *s <= '9')
30c: 8b 45 08 mov 0x8(%ebp),%eax
30f: 0f b6 00 movzbl (%eax),%eax
312: 3c 2f cmp $0x2f,%al
314: 7e 0a jle 320 <atoi+0x48>
316: 8b 45 08 mov 0x8(%ebp),%eax
319: 0f b6 00 movzbl (%eax),%eax
31c: 3c 39 cmp $0x39,%al
31e: 7e c7 jle 2e7 <atoi+0xf>
n = n*10 + *s++ - '0';
return n;
320: 8b 45 fc mov -0x4(%ebp),%eax
}
323: c9 leave
324: c3 ret
00000325 <memmove>:
void*
memmove(void *vdst, void *vsrc, int n)
{
325: 55 push %ebp
326: 89 e5 mov %esp,%ebp
328: 83 ec 10 sub $0x10,%esp
char *dst, *src;
dst = vdst;
32b: 8b 45 08 mov 0x8(%ebp),%eax
32e: 89 45 fc mov %eax,-0x4(%ebp)
src = vsrc;
331: 8b 45 0c mov 0xc(%ebp),%eax
334: 89 45 f8 mov %eax,-0x8(%ebp)
while(n-- > 0)
337: eb 17 jmp 350 <memmove+0x2b>
*dst++ = *src++;
339: 8b 45 fc mov -0x4(%ebp),%eax
33c: 8d 50 01 lea 0x1(%eax),%edx
33f: 89 55 fc mov %edx,-0x4(%ebp)
342: 8b 55 f8 mov -0x8(%ebp),%edx
345: 8d 4a 01 lea 0x1(%edx),%ecx
348: 89 4d f8 mov %ecx,-0x8(%ebp)
34b: 0f b6 12 movzbl (%edx),%edx
34e: 88 10 mov %dl,(%eax)
{
char *dst, *src;
dst = vdst;
src = vsrc;
while(n-- > 0)
350: 8b 45 10 mov 0x10(%ebp),%eax
353: 8d 50 ff lea -0x1(%eax),%edx
356: 89 55 10 mov %edx,0x10(%ebp)
359: 85 c0 test %eax,%eax
35b: 7f dc jg 339 <memmove+0x14>
*dst++ = *src++;
return vdst;
35d: 8b 45 08 mov 0x8(%ebp),%eax
}
360: c9 leave
361: c3 ret
00000362 <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
362: b8 01 00 00 00 mov $0x1,%eax
367: cd 40 int $0x40
369: c3 ret
0000036a <exit>:
SYSCALL(exit)
36a: b8 02 00 00 00 mov $0x2,%eax
36f: cd 40 int $0x40
371: c3 ret
00000372 <wait>:
SYSCALL(wait)
372: b8 03 00 00 00 mov $0x3,%eax
377: cd 40 int $0x40
379: c3 ret
0000037a <pipe>:
SYSCALL(pipe)
37a: b8 04 00 00 00 mov $0x4,%eax
37f: cd 40 int $0x40
381: c3 ret
00000382 <read>:
SYSCALL(read)
382: b8 05 00 00 00 mov $0x5,%eax
387: cd 40 int $0x40
389: c3 ret
0000038a <write>:
SYSCALL(write)
38a: b8 10 00 00 00 mov $0x10,%eax
38f: cd 40 int $0x40
391: c3 ret
00000392 <close>:
SYSCALL(close)
392: b8 15 00 00 00 mov $0x15,%eax
397: cd 40 int $0x40
399: c3 ret
0000039a <kill>:
SYSCALL(kill)
39a: b8 06 00 00 00 mov $0x6,%eax
39f: cd 40 int $0x40
3a1: c3 ret
000003a2 <exec>:
SYSCALL(exec)
3a2: b8 07 00 00 00 mov $0x7,%eax
3a7: cd 40 int $0x40
3a9: c3 ret
000003aa <open>:
SYSCALL(open)
3aa: b8 0f 00 00 00 mov $0xf,%eax
3af: cd 40 int $0x40
3b1: c3 ret
000003b2 <mknod>:
SYSCALL(mknod)
3b2: b8 11 00 00 00 mov $0x11,%eax
3b7: cd 40 int $0x40
3b9: c3 ret
000003ba <unlink>:
SYSCALL(unlink)
3ba: b8 12 00 00 00 mov $0x12,%eax
3bf: cd 40 int $0x40
3c1: c3 ret
000003c2 <fstat>:
SYSCALL(fstat)
3c2: b8 08 00 00 00 mov $0x8,%eax
3c7: cd 40 int $0x40
3c9: c3 ret
000003ca <link>:
SYSCALL(link)
3ca: b8 13 00 00 00 mov $0x13,%eax
3cf: cd 40 int $0x40
3d1: c3 ret
000003d2 <mkdir>:
SYSCALL(mkdir)
3d2: b8 14 00 00 00 mov $0x14,%eax
3d7: cd 40 int $0x40
3d9: c3 ret
000003da <chdir>:
SYSCALL(chdir)
3da: b8 09 00 00 00 mov $0x9,%eax
3df: cd 40 int $0x40
3e1: c3 ret
000003e2 <dup>:
SYSCALL(dup)
3e2: b8 0a 00 00 00 mov $0xa,%eax
3e7: cd 40 int $0x40
3e9: c3 ret
000003ea <getpid>:
SYSCALL(getpid)
3ea: b8 0b 00 00 00 mov $0xb,%eax
3ef: cd 40 int $0x40
3f1: c3 ret
000003f2 <sbrk>:
SYSCALL(sbrk)
3f2: b8 0c 00 00 00 mov $0xc,%eax
3f7: cd 40 int $0x40
3f9: c3 ret
000003fa <sleep>:
SYSCALL(sleep)
3fa: b8 0d 00 00 00 mov $0xd,%eax
3ff: cd 40 int $0x40
401: c3 ret
00000402 <uptime>:
SYSCALL(uptime)
402: b8 0e 00 00 00 mov $0xe,%eax
407: cd 40 int $0x40
409: c3 ret
0000040a <mount>:
SYSCALL(mount)
40a: b8 16 00 00 00 mov $0x16,%eax
40f: cd 40 int $0x40
411: c3 ret
00000412 <putc>:
#include "stat.h"
#include "user.h"
static void
putc(int fd, char c)
{
412: 55 push %ebp
413: 89 e5 mov %esp,%ebp
415: 83 ec 18 sub $0x18,%esp
418: 8b 45 0c mov 0xc(%ebp),%eax
41b: 88 45 f4 mov %al,-0xc(%ebp)
write(fd, &c, 1);
41e: 83 ec 04 sub $0x4,%esp
421: 6a 01 push $0x1
423: 8d 45 f4 lea -0xc(%ebp),%eax
426: 50 push %eax
427: ff 75 08 pushl 0x8(%ebp)
42a: e8 5b ff ff ff call 38a <write>
42f: 83 c4 10 add $0x10,%esp
}
432: 90 nop
433: c9 leave
434: c3 ret
00000435 <printint>:
static void
printint(int fd, int xx, int base, int sgn)
{
435: 55 push %ebp
436: 89 e5 mov %esp,%ebp
438: 53 push %ebx
439: 83 ec 24 sub $0x24,%esp
static char digits[] = "0123456789ABCDEF";
char buf[16];
int i, neg;
uint x;
neg = 0;
43c: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
if(sgn && xx < 0){
443: 83 7d 14 00 cmpl $0x0,0x14(%ebp)
447: 74 17 je 460 <printint+0x2b>
449: 83 7d 0c 00 cmpl $0x0,0xc(%ebp)
44d: 79 11 jns 460 <printint+0x2b>
neg = 1;
44f: c7 45 f0 01 00 00 00 movl $0x1,-0x10(%ebp)
x = -xx;
456: 8b 45 0c mov 0xc(%ebp),%eax
459: f7 d8 neg %eax
45b: 89 45 ec mov %eax,-0x14(%ebp)
45e: eb 06 jmp 466 <printint+0x31>
} else {
x = xx;
460: 8b 45 0c mov 0xc(%ebp),%eax
463: 89 45 ec mov %eax,-0x14(%ebp)
}
i = 0;
466: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
do{
buf[i++] = digits[x % base];
46d: 8b 4d f4 mov -0xc(%ebp),%ecx
470: 8d 41 01 lea 0x1(%ecx),%eax
473: 89 45 f4 mov %eax,-0xc(%ebp)
476: 8b 5d 10 mov 0x10(%ebp),%ebx
479: 8b 45 ec mov -0x14(%ebp),%eax
47c: ba 00 00 00 00 mov $0x0,%edx
481: f7 f3 div %ebx
483: 89 d0 mov %edx,%eax
485: 0f b6 80 54 0b 00 00 movzbl 0xb54(%eax),%eax
48c: 88 44 0d dc mov %al,-0x24(%ebp,%ecx,1)
}while((x /= base) != 0);
490: 8b 5d 10 mov 0x10(%ebp),%ebx
493: 8b 45 ec mov -0x14(%ebp),%eax
496: ba 00 00 00 00 mov $0x0,%edx
49b: f7 f3 div %ebx
49d: 89 45 ec mov %eax,-0x14(%ebp)
4a0: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
4a4: 75 c7 jne 46d <printint+0x38>
if(neg)
4a6: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
4aa: 74 2d je 4d9 <printint+0xa4>
buf[i++] = '-';
4ac: 8b 45 f4 mov -0xc(%ebp),%eax
4af: 8d 50 01 lea 0x1(%eax),%edx
4b2: 89 55 f4 mov %edx,-0xc(%ebp)
4b5: c6 44 05 dc 2d movb $0x2d,-0x24(%ebp,%eax,1)
while(--i >= 0)
4ba: eb 1d jmp 4d9 <printint+0xa4>
putc(fd, buf[i]);
4bc: 8d 55 dc lea -0x24(%ebp),%edx
4bf: 8b 45 f4 mov -0xc(%ebp),%eax
4c2: 01 d0 add %edx,%eax
4c4: 0f b6 00 movzbl (%eax),%eax
4c7: 0f be c0 movsbl %al,%eax
4ca: 83 ec 08 sub $0x8,%esp
4cd: 50 push %eax
4ce: ff 75 08 pushl 0x8(%ebp)
4d1: e8 3c ff ff ff call 412 <putc>
4d6: 83 c4 10 add $0x10,%esp
buf[i++] = digits[x % base];
}while((x /= base) != 0);
if(neg)
buf[i++] = '-';
while(--i >= 0)
4d9: 83 6d f4 01 subl $0x1,-0xc(%ebp)
4dd: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
4e1: 79 d9 jns 4bc <printint+0x87>
putc(fd, buf[i]);
}
4e3: 90 nop
4e4: 8b 5d fc mov -0x4(%ebp),%ebx
4e7: c9 leave
4e8: c3 ret
000004e9 <printf>:
// Print to the given fd. Only understands %d, %x, %p, %s.
void
printf(int fd, char *fmt, ...)
{
4e9: 55 push %ebp
4ea: 89 e5 mov %esp,%ebp
4ec: 83 ec 28 sub $0x28,%esp
char *s;
int c, i, state;
uint *ap;
state = 0;
4ef: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%ebp)
ap = (uint*)(void*)&fmt + 1;
4f6: 8d 45 0c lea 0xc(%ebp),%eax
4f9: 83 c0 04 add $0x4,%eax
4fc: 89 45 e8 mov %eax,-0x18(%ebp)
for(i = 0; fmt[i]; i++){
4ff: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
506: e9 59 01 00 00 jmp 664 <printf+0x17b>
c = fmt[i] & 0xff;
50b: 8b 55 0c mov 0xc(%ebp),%edx
50e: 8b 45 f0 mov -0x10(%ebp),%eax
511: 01 d0 add %edx,%eax
513: 0f b6 00 movzbl (%eax),%eax
516: 0f be c0 movsbl %al,%eax
519: 25 ff 00 00 00 and $0xff,%eax
51e: 89 45 e4 mov %eax,-0x1c(%ebp)
if(state == 0){
521: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
525: 75 2c jne 553 <printf+0x6a>
if(c == '%'){
527: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
52b: 75 0c jne 539 <printf+0x50>
state = '%';
52d: c7 45 ec 25 00 00 00 movl $0x25,-0x14(%ebp)
534: e9 27 01 00 00 jmp 660 <printf+0x177>
} else {
putc(fd, c);
539: 8b 45 e4 mov -0x1c(%ebp),%eax
53c: 0f be c0 movsbl %al,%eax
53f: 83 ec 08 sub $0x8,%esp
542: 50 push %eax
543: ff 75 08 pushl 0x8(%ebp)
546: e8 c7 fe ff ff call 412 <putc>
54b: 83 c4 10 add $0x10,%esp
54e: e9 0d 01 00 00 jmp 660 <printf+0x177>
}
} else if(state == '%'){
553: 83 7d ec 25 cmpl $0x25,-0x14(%ebp)
557: 0f 85 03 01 00 00 jne 660 <printf+0x177>
if(c == 'd'){
55d: 83 7d e4 64 cmpl $0x64,-0x1c(%ebp)
561: 75 1e jne 581 <printf+0x98>
printint(fd, *ap, 10, 1);
563: 8b 45 e8 mov -0x18(%ebp),%eax
566: 8b 00 mov (%eax),%eax
568: 6a 01 push $0x1
56a: 6a 0a push $0xa
56c: 50 push %eax
56d: ff 75 08 pushl 0x8(%ebp)
570: e8 c0 fe ff ff call 435 <printint>
575: 83 c4 10 add $0x10,%esp
ap++;
578: 83 45 e8 04 addl $0x4,-0x18(%ebp)
57c: e9 d8 00 00 00 jmp 659 <printf+0x170>
} else if(c == 'x' || c == 'p'){
581: 83 7d e4 78 cmpl $0x78,-0x1c(%ebp)
585: 74 06 je 58d <printf+0xa4>
587: 83 7d e4 70 cmpl $0x70,-0x1c(%ebp)
58b: 75 1e jne 5ab <printf+0xc2>
printint(fd, *ap, 16, 0);
58d: 8b 45 e8 mov -0x18(%ebp),%eax
590: 8b 00 mov (%eax),%eax
592: 6a 00 push $0x0
594: 6a 10 push $0x10
596: 50 push %eax
597: ff 75 08 pushl 0x8(%ebp)
59a: e8 96 fe ff ff call 435 <printint>
59f: 83 c4 10 add $0x10,%esp
ap++;
5a2: 83 45 e8 04 addl $0x4,-0x18(%ebp)
5a6: e9 ae 00 00 00 jmp 659 <printf+0x170>
} else if(c == 's'){
5ab: 83 7d e4 73 cmpl $0x73,-0x1c(%ebp)
5af: 75 43 jne 5f4 <printf+0x10b>
s = (char*)*ap;
5b1: 8b 45 e8 mov -0x18(%ebp),%eax
5b4: 8b 00 mov (%eax),%eax
5b6: 89 45 f4 mov %eax,-0xc(%ebp)
ap++;
5b9: 83 45 e8 04 addl $0x4,-0x18(%ebp)
if(s == 0)
5bd: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
5c1: 75 25 jne 5e8 <printf+0xff>
s = "(null)";
5c3: c7 45 f4 fd 08 00 00 movl $0x8fd,-0xc(%ebp)
while(*s != 0){
5ca: eb 1c jmp 5e8 <printf+0xff>
putc(fd, *s);
5cc: 8b 45 f4 mov -0xc(%ebp),%eax
5cf: 0f b6 00 movzbl (%eax),%eax
5d2: 0f be c0 movsbl %al,%eax
5d5: 83 ec 08 sub $0x8,%esp
5d8: 50 push %eax
5d9: ff 75 08 pushl 0x8(%ebp)
5dc: e8 31 fe ff ff call 412 <putc>
5e1: 83 c4 10 add $0x10,%esp
s++;
5e4: 83 45 f4 01 addl $0x1,-0xc(%ebp)
} else if(c == 's'){
s = (char*)*ap;
ap++;
if(s == 0)
s = "(null)";
while(*s != 0){
5e8: 8b 45 f4 mov -0xc(%ebp),%eax
5eb: 0f b6 00 movzbl (%eax),%eax
5ee: 84 c0 test %al,%al
5f0: 75 da jne 5cc <printf+0xe3>
5f2: eb 65 jmp 659 <printf+0x170>
putc(fd, *s);
s++;
}
} else if(c == 'c'){
5f4: 83 7d e4 63 cmpl $0x63,-0x1c(%ebp)
5f8: 75 1d jne 617 <printf+0x12e>
putc(fd, *ap);
5fa: 8b 45 e8 mov -0x18(%ebp),%eax
5fd: 8b 00 mov (%eax),%eax
5ff: 0f be c0 movsbl %al,%eax
602: 83 ec 08 sub $0x8,%esp
605: 50 push %eax
606: ff 75 08 pushl 0x8(%ebp)
609: e8 04 fe ff ff call 412 <putc>
60e: 83 c4 10 add $0x10,%esp
ap++;
611: 83 45 e8 04 addl $0x4,-0x18(%ebp)
615: eb 42 jmp 659 <printf+0x170>
} else if(c == '%'){
617: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
61b: 75 17 jne 634 <printf+0x14b>
putc(fd, c);
61d: 8b 45 e4 mov -0x1c(%ebp),%eax
620: 0f be c0 movsbl %al,%eax
623: 83 ec 08 sub $0x8,%esp
626: 50 push %eax
627: ff 75 08 pushl 0x8(%ebp)
62a: e8 e3 fd ff ff call 412 <putc>
62f: 83 c4 10 add $0x10,%esp
632: eb 25 jmp 659 <printf+0x170>
} else {
// Unknown % sequence. Print it to draw attention.
putc(fd, '%');
634: 83 ec 08 sub $0x8,%esp
637: 6a 25 push $0x25
639: ff 75 08 pushl 0x8(%ebp)
63c: e8 d1 fd ff ff call 412 <putc>
641: 83 c4 10 add $0x10,%esp
putc(fd, c);
644: 8b 45 e4 mov -0x1c(%ebp),%eax
647: 0f be c0 movsbl %al,%eax
64a: 83 ec 08 sub $0x8,%esp
64d: 50 push %eax
64e: ff 75 08 pushl 0x8(%ebp)
651: e8 bc fd ff ff call 412 <putc>
656: 83 c4 10 add $0x10,%esp
}
state = 0;
659: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%ebp)
int c, i, state;
uint *ap;
state = 0;
ap = (uint*)(void*)&fmt + 1;
for(i = 0; fmt[i]; i++){
660: 83 45 f0 01 addl $0x1,-0x10(%ebp)
664: 8b 55 0c mov 0xc(%ebp),%edx
667: 8b 45 f0 mov -0x10(%ebp),%eax
66a: 01 d0 add %edx,%eax
66c: 0f b6 00 movzbl (%eax),%eax
66f: 84 c0 test %al,%al
671: 0f 85 94 fe ff ff jne 50b <printf+0x22>
putc(fd, c);
}
state = 0;
}
}
}
677: 90 nop
678: c9 leave
679: c3 ret
0000067a <free>:
static Header base;
static Header *freep;
void
free(void *ap)
{
67a: 55 push %ebp
67b: 89 e5 mov %esp,%ebp
67d: 83 ec 10 sub $0x10,%esp
Header *bp, *p;
bp = (Header*)ap - 1;
680: 8b 45 08 mov 0x8(%ebp),%eax