Files
xv6-custom-os/shutdown.asm

1211 lines
41 KiB
NASM

_shutdown: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
#include "types.h"
#include "user.h"
int main(int argc, char *argv[]) {
0: 8d 4c 24 04 lea 0x4(%esp),%ecx
4: 83 e4 f0 and $0xfffffff0,%esp
7: ff 71 fc push -0x4(%ecx)
a: 55 push %ebp
b: 89 e5 mov %esp,%ebp
d: 57 push %edi
e: 56 push %esi
f: 53 push %ebx
10: 51 push %ecx
11: 83 ec 18 sub $0x18,%esp
14: 8b 01 mov (%ecx),%eax
16: 8b 71 04 mov 0x4(%ecx),%esi
19: 89 45 e4 mov %eax,-0x1c(%ebp)
int restart = 0;
for (int i = 1; i < argc; i++) {
1c: 83 f8 01 cmp $0x1,%eax
1f: 7e 58 jle 79 <main+0x79>
21: bb 01 00 00 00 mov $0x1,%ebx
int restart = 0;
26: 31 ff xor %edi,%edi
28: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
2f: 90 nop
if (strcmp(argv[i], "-r") == 0) {
30: 83 ec 08 sub $0x8,%esp
33: 68 88 07 00 00 push $0x788
38: ff 34 9e push (%esi,%ebx,4)
3b: e8 80 00 00 00 call c0 <strcmp>
40: 83 c4 10 add $0x10,%esp
restart = 1;
43: 85 c0 test %eax,%eax
45: b8 01 00 00 00 mov $0x1,%eax
4a: 0f 44 f8 cmove %eax,%edi
for (int i = 1; i < argc; i++) {
4d: 83 c3 01 add $0x1,%ebx
50: 39 5d e4 cmp %ebx,-0x1c(%ebp)
53: 75 db jne 30 <main+0x30>
}
}
switch(restart) {
55: 83 ff 01 cmp $0x1,%edi
58: 75 1f jne 79 <main+0x79>
case 0:
printf(1, "Shutting Down...\n");
break;
case 1:
printf(1, "Restarting...\n");
5a: 50 push %eax
5b: 50 push %eax
5c: 68 9d 07 00 00 push $0x79d
61: 6a 01 push $0x1
63: e8 f8 03 00 00 call 460 <printf>
break;
68: 83 c4 10 add $0x10,%esp
}
shutdown(restart);
6b: 83 ec 0c sub $0xc,%esp
6e: 57 push %edi
6f: e8 1f 03 00 00 call 393 <shutdown>
exit();
74: e8 6a 02 00 00 call 2e3 <exit>
printf(1, "Shutting Down...\n");
79: 52 push %edx
break;
7a: 31 ff xor %edi,%edi
printf(1, "Shutting Down...\n");
7c: 52 push %edx
7d: 68 8b 07 00 00 push $0x78b
82: 6a 01 push $0x1
84: e8 d7 03 00 00 call 460 <printf>
break;
89: 83 c4 10 add $0x10,%esp
8c: eb dd jmp 6b <main+0x6b>
8e: 66 90 xchg %ax,%ax
00000090 <strcpy>:
#include "stat.h"
#include "fcntl.h"
#include "user.h"
#include "x86.h"
char*strcpy(char *s, const char *t) {
90: 55 push %ebp
char *os;
os = s;
while ((*s++ = *t++) != 0) {
91: 31 c0 xor %eax,%eax
char*strcpy(char *s, const char *t) {
93: 89 e5 mov %esp,%ebp
95: 53 push %ebx
96: 8b 4d 08 mov 0x8(%ebp),%ecx
99: 8b 5d 0c mov 0xc(%ebp),%ebx
9c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
while ((*s++ = *t++) != 0) {
a0: 0f b6 14 03 movzbl (%ebx,%eax,1),%edx
a4: 88 14 01 mov %dl,(%ecx,%eax,1)
a7: 83 c0 01 add $0x1,%eax
aa: 84 d2 test %dl,%dl
ac: 75 f2 jne a0 <strcpy+0x10>
;
}
return os;
}
ae: 8b 5d fc mov -0x4(%ebp),%ebx
b1: 89 c8 mov %ecx,%eax
b3: c9 leave
b4: c3 ret
b5: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
bc: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
000000c0 <strcmp>:
int strcmp(const char *p, const char *q) {
c0: 55 push %ebp
c1: 89 e5 mov %esp,%ebp
c3: 53 push %ebx
c4: 8b 55 08 mov 0x8(%ebp),%edx
c7: 8b 4d 0c mov 0xc(%ebp),%ecx
while (*p && *p == *q) {
ca: 0f b6 02 movzbl (%edx),%eax
cd: 84 c0 test %al,%al
cf: 75 17 jne e8 <strcmp+0x28>
d1: eb 3a jmp 10d <strcmp+0x4d>
d3: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
d7: 90 nop
d8: 0f b6 42 01 movzbl 0x1(%edx),%eax
p++, q++;
dc: 83 c2 01 add $0x1,%edx
df: 8d 59 01 lea 0x1(%ecx),%ebx
while (*p && *p == *q) {
e2: 84 c0 test %al,%al
e4: 74 1a je 100 <strcmp+0x40>
p++, q++;
e6: 89 d9 mov %ebx,%ecx
while (*p && *p == *q) {
e8: 0f b6 19 movzbl (%ecx),%ebx
eb: 38 c3 cmp %al,%bl
ed: 74 e9 je d8 <strcmp+0x18>
}
return (uchar) * p - (uchar) * q;
ef: 29 d8 sub %ebx,%eax
}
f1: 8b 5d fc mov -0x4(%ebp),%ebx
f4: c9 leave
f5: c3 ret
f6: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
fd: 8d 76 00 lea 0x0(%esi),%esi
return (uchar) * p - (uchar) * q;
100: 0f b6 59 01 movzbl 0x1(%ecx),%ebx
104: 31 c0 xor %eax,%eax
106: 29 d8 sub %ebx,%eax
}
108: 8b 5d fc mov -0x4(%ebp),%ebx
10b: c9 leave
10c: c3 ret
return (uchar) * p - (uchar) * q;
10d: 0f b6 19 movzbl (%ecx),%ebx
110: 31 c0 xor %eax,%eax
112: eb db jmp ef <strcmp+0x2f>
114: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
11b: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
11f: 90 nop
00000120 <strlen>:
uint strlen(const char *s) {
120: 55 push %ebp
121: 89 e5 mov %esp,%ebp
123: 8b 55 08 mov 0x8(%ebp),%edx
int n;
for (n = 0; s[n]; n++) {
126: 80 3a 00 cmpb $0x0,(%edx)
129: 74 15 je 140 <strlen+0x20>
12b: 31 c0 xor %eax,%eax
12d: 8d 76 00 lea 0x0(%esi),%esi
130: 83 c0 01 add $0x1,%eax
133: 80 3c 02 00 cmpb $0x0,(%edx,%eax,1)
137: 89 c1 mov %eax,%ecx
139: 75 f5 jne 130 <strlen+0x10>
;
}
return n;
}
13b: 89 c8 mov %ecx,%eax
13d: 5d pop %ebp
13e: c3 ret
13f: 90 nop
for (n = 0; s[n]; n++) {
140: 31 c9 xor %ecx,%ecx
}
142: 5d pop %ebp
143: 89 c8 mov %ecx,%eax
145: c3 ret
146: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
14d: 8d 76 00 lea 0x0(%esi),%esi
00000150 <memset>:
void* memset(void *dst, int c, uint n) {
150: 55 push %ebp
151: 89 e5 mov %esp,%ebp
153: 57 push %edi
154: 8b 55 08 mov 0x8(%ebp),%edx
"d" (port), "0" (addr), "1" (cnt) :
"cc");
}
static inline void stosb(void *addr, int data, int cnt) {
asm volatile ("cld; rep stosb" :
157: 8b 4d 10 mov 0x10(%ebp),%ecx
15a: 8b 45 0c mov 0xc(%ebp),%eax
15d: 89 d7 mov %edx,%edi
15f: fc cld
160: f3 aa rep stos %al,%es:(%edi)
stosb(dst, c, n);
return dst;
}
162: 8b 7d fc mov -0x4(%ebp),%edi
165: 89 d0 mov %edx,%eax
167: c9 leave
168: c3 ret
169: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
00000170 <strchr>:
char* strchr(const char *s, char c) {
170: 55 push %ebp
171: 89 e5 mov %esp,%ebp
173: 8b 45 08 mov 0x8(%ebp),%eax
176: 0f b6 4d 0c movzbl 0xc(%ebp),%ecx
for (; *s; s++) {
17a: 0f b6 10 movzbl (%eax),%edx
17d: 84 d2 test %dl,%dl
17f: 75 12 jne 193 <strchr+0x23>
181: eb 1d jmp 1a0 <strchr+0x30>
183: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
187: 90 nop
188: 0f b6 50 01 movzbl 0x1(%eax),%edx
18c: 83 c0 01 add $0x1,%eax
18f: 84 d2 test %dl,%dl
191: 74 0d je 1a0 <strchr+0x30>
if (*s == c) {
193: 38 d1 cmp %dl,%cl
195: 75 f1 jne 188 <strchr+0x18>
return (char*)s;
}
}
return 0;
}
197: 5d pop %ebp
198: c3 ret
199: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
return 0;
1a0: 31 c0 xor %eax,%eax
}
1a2: 5d pop %ebp
1a3: c3 ret
1a4: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
1ab: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
1af: 90 nop
000001b0 <gets>:
char* gets(char *buf, int max) {
1b0: 55 push %ebp
1b1: 89 e5 mov %esp,%ebp
1b3: 57 push %edi
1b4: 56 push %esi
int i, cc;
char c;
for (i = 0; i + 1 < max;) {
cc = read(0, &c, 1);
1b5: 8d 7d e7 lea -0x19(%ebp),%edi
char* gets(char *buf, int max) {
1b8: 53 push %ebx
for (i = 0; i + 1 < max;) {
1b9: 31 db xor %ebx,%ebx
char* gets(char *buf, int max) {
1bb: 83 ec 1c sub $0x1c,%esp
for (i = 0; i + 1 < max;) {
1be: eb 27 jmp 1e7 <gets+0x37>
cc = read(0, &c, 1);
1c0: 83 ec 04 sub $0x4,%esp
1c3: 6a 01 push $0x1
1c5: 57 push %edi
1c6: 6a 00 push $0x0
1c8: e8 2e 01 00 00 call 2fb <read>
if (cc < 1) {
1cd: 83 c4 10 add $0x10,%esp
1d0: 85 c0 test %eax,%eax
1d2: 7e 1d jle 1f1 <gets+0x41>
break;
}
buf[i++] = c;
1d4: 0f b6 45 e7 movzbl -0x19(%ebp),%eax
1d8: 8b 55 08 mov 0x8(%ebp),%edx
1db: 88 44 1a ff mov %al,-0x1(%edx,%ebx,1)
if (c == '\n' || c == '\r') {
1df: 3c 0a cmp $0xa,%al
1e1: 74 1d je 200 <gets+0x50>
1e3: 3c 0d cmp $0xd,%al
1e5: 74 19 je 200 <gets+0x50>
for (i = 0; i + 1 < max;) {
1e7: 89 de mov %ebx,%esi
1e9: 83 c3 01 add $0x1,%ebx
1ec: 3b 5d 0c cmp 0xc(%ebp),%ebx
1ef: 7c cf jl 1c0 <gets+0x10>
break;
}
}
buf[i] = '\0';
1f1: 8b 45 08 mov 0x8(%ebp),%eax
1f4: c6 04 30 00 movb $0x0,(%eax,%esi,1)
return buf;
}
1f8: 8d 65 f4 lea -0xc(%ebp),%esp
1fb: 5b pop %ebx
1fc: 5e pop %esi
1fd: 5f pop %edi
1fe: 5d pop %ebp
1ff: c3 ret
buf[i] = '\0';
200: 8b 45 08 mov 0x8(%ebp),%eax
203: 89 de mov %ebx,%esi
205: c6 04 30 00 movb $0x0,(%eax,%esi,1)
}
209: 8d 65 f4 lea -0xc(%ebp),%esp
20c: 5b pop %ebx
20d: 5e pop %esi
20e: 5f pop %edi
20f: 5d pop %ebp
210: c3 ret
211: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
218: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
21f: 90 nop
00000220 <stat>:
int stat(const char *n, struct stat *st) {
220: 55 push %ebp
221: 89 e5 mov %esp,%ebp
223: 56 push %esi
224: 53 push %ebx
int fd;
int r;
fd = open(n, O_RDONLY);
225: 83 ec 08 sub $0x8,%esp
228: 6a 00 push $0x0
22a: ff 75 08 push 0x8(%ebp)
22d: e8 19 01 00 00 call 34b <open>
if (fd < 0) {
232: 83 c4 10 add $0x10,%esp
235: 85 c0 test %eax,%eax
237: 78 27 js 260 <stat+0x40>
return -1;
}
r = fstat(fd, st);
239: 83 ec 08 sub $0x8,%esp
23c: ff 75 0c push 0xc(%ebp)
23f: 89 c3 mov %eax,%ebx
241: 50 push %eax
242: e8 cc 00 00 00 call 313 <fstat>
close(fd);
247: 89 1c 24 mov %ebx,(%esp)
r = fstat(fd, st);
24a: 89 c6 mov %eax,%esi
close(fd);
24c: e8 2a 01 00 00 call 37b <close>
return r;
251: 83 c4 10 add $0x10,%esp
}
254: 8d 65 f8 lea -0x8(%ebp),%esp
257: 89 f0 mov %esi,%eax
259: 5b pop %ebx
25a: 5e pop %esi
25b: 5d pop %ebp
25c: c3 ret
25d: 8d 76 00 lea 0x0(%esi),%esi
return -1;
260: be ff ff ff ff mov $0xffffffff,%esi
265: eb ed jmp 254 <stat+0x34>
267: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
26e: 66 90 xchg %ax,%ax
00000270 <atoi>:
int atoi(const char *s) {
270: 55 push %ebp
271: 89 e5 mov %esp,%ebp
273: 53 push %ebx
274: 8b 55 08 mov 0x8(%ebp),%edx
int n;
n = 0;
while ('0' <= *s && *s <= '9') {
277: 0f be 02 movsbl (%edx),%eax
27a: 8d 48 d0 lea -0x30(%eax),%ecx
27d: 80 f9 09 cmp $0x9,%cl
n = 0;
280: b9 00 00 00 00 mov $0x0,%ecx
while ('0' <= *s && *s <= '9') {
285: 77 1e ja 2a5 <atoi+0x35>
287: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
28e: 66 90 xchg %ax,%ax
n = n * 10 + *s++ - '0';
290: 83 c2 01 add $0x1,%edx
293: 8d 0c 89 lea (%ecx,%ecx,4),%ecx
296: 8d 4c 48 d0 lea -0x30(%eax,%ecx,2),%ecx
while ('0' <= *s && *s <= '9') {
29a: 0f be 02 movsbl (%edx),%eax
29d: 8d 58 d0 lea -0x30(%eax),%ebx
2a0: 80 fb 09 cmp $0x9,%bl
2a3: 76 eb jbe 290 <atoi+0x20>
}
return n;
}
2a5: 8b 5d fc mov -0x4(%ebp),%ebx
2a8: 89 c8 mov %ecx,%eax
2aa: c9 leave
2ab: c3 ret
2ac: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
000002b0 <memmove>:
void* memmove(void *vdst, const void *vsrc, int n) {
2b0: 55 push %ebp
2b1: 89 e5 mov %esp,%ebp
2b3: 57 push %edi
2b4: 8b 45 10 mov 0x10(%ebp),%eax
2b7: 8b 55 08 mov 0x8(%ebp),%edx
2ba: 56 push %esi
2bb: 8b 75 0c mov 0xc(%ebp),%esi
char *dst;
const char *src;
dst = vdst;
src = vsrc;
while (n-- > 0) {
2be: 85 c0 test %eax,%eax
2c0: 7e 13 jle 2d5 <memmove+0x25>
2c2: 01 d0 add %edx,%eax
dst = vdst;
2c4: 89 d7 mov %edx,%edi
2c6: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
2cd: 8d 76 00 lea 0x0(%esi),%esi
*dst++ = *src++;
2d0: a4 movsb %ds:(%esi),%es:(%edi)
while (n-- > 0) {
2d1: 39 f8 cmp %edi,%eax
2d3: 75 fb jne 2d0 <memmove+0x20>
}
return vdst;
}
2d5: 5e pop %esi
2d6: 89 d0 mov %edx,%eax
2d8: 5f pop %edi
2d9: 5d pop %ebp
2da: c3 ret
000002db <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
2db: b8 01 00 00 00 mov $0x1,%eax
2e0: cd 40 int $0x40
2e2: c3 ret
000002e3 <exit>:
SYSCALL(exit)
2e3: b8 02 00 00 00 mov $0x2,%eax
2e8: cd 40 int $0x40
2ea: c3 ret
000002eb <wait>:
SYSCALL(wait)
2eb: b8 03 00 00 00 mov $0x3,%eax
2f0: cd 40 int $0x40
2f2: c3 ret
000002f3 <pipe>:
SYSCALL(pipe)
2f3: b8 04 00 00 00 mov $0x4,%eax
2f8: cd 40 int $0x40
2fa: c3 ret
000002fb <read>:
SYSCALL(read)
2fb: b8 05 00 00 00 mov $0x5,%eax
300: cd 40 int $0x40
302: c3 ret
00000303 <kill>:
SYSCALL(kill)
303: b8 06 00 00 00 mov $0x6,%eax
308: cd 40 int $0x40
30a: c3 ret
0000030b <exec>:
SYSCALL(exec)
30b: b8 07 00 00 00 mov $0x7,%eax
310: cd 40 int $0x40
312: c3 ret
00000313 <fstat>:
SYSCALL(fstat)
313: b8 08 00 00 00 mov $0x8,%eax
318: cd 40 int $0x40
31a: c3 ret
0000031b <chdir>:
SYSCALL(chdir)
31b: b8 09 00 00 00 mov $0x9,%eax
320: cd 40 int $0x40
322: c3 ret
00000323 <dup>:
SYSCALL(dup)
323: b8 0a 00 00 00 mov $0xa,%eax
328: cd 40 int $0x40
32a: c3 ret
0000032b <getpid>:
SYSCALL(getpid)
32b: b8 0b 00 00 00 mov $0xb,%eax
330: cd 40 int $0x40
332: c3 ret
00000333 <sbrk>:
SYSCALL(sbrk)
333: b8 0c 00 00 00 mov $0xc,%eax
338: cd 40 int $0x40
33a: c3 ret
0000033b <sleep>:
SYSCALL(sleep)
33b: b8 0d 00 00 00 mov $0xd,%eax
340: cd 40 int $0x40
342: c3 ret
00000343 <uptime>:
SYSCALL(uptime)
343: b8 0e 00 00 00 mov $0xe,%eax
348: cd 40 int $0x40
34a: c3 ret
0000034b <open>:
SYSCALL(open)
34b: b8 0f 00 00 00 mov $0xf,%eax
350: cd 40 int $0x40
352: c3 ret
00000353 <write>:
SYSCALL(write)
353: b8 10 00 00 00 mov $0x10,%eax
358: cd 40 int $0x40
35a: c3 ret
0000035b <mknod>:
SYSCALL(mknod)
35b: b8 11 00 00 00 mov $0x11,%eax
360: cd 40 int $0x40
362: c3 ret
00000363 <unlink>:
SYSCALL(unlink)
363: b8 12 00 00 00 mov $0x12,%eax
368: cd 40 int $0x40
36a: c3 ret
0000036b <link>:
SYSCALL(link)
36b: b8 13 00 00 00 mov $0x13,%eax
370: cd 40 int $0x40
372: c3 ret
00000373 <mkdir>:
SYSCALL(mkdir)
373: b8 14 00 00 00 mov $0x14,%eax
378: cd 40 int $0x40
37a: c3 ret
0000037b <close>:
SYSCALL(close)
37b: b8 15 00 00 00 mov $0x15,%eax
380: cd 40 int $0x40
382: c3 ret
00000383 <getch>:
SYSCALL(getch)
383: b8 16 00 00 00 mov $0x16,%eax
388: cd 40 int $0x40
38a: c3 ret
0000038b <greeting>:
SYSCALL(greeting)
38b: b8 17 00 00 00 mov $0x17,%eax
390: cd 40 int $0x40
392: c3 ret
00000393 <shutdown>:
SYSCALL(shutdown)
393: b8 18 00 00 00 mov $0x18,%eax
398: cd 40 int $0x40
39a: c3 ret
0000039b <screen>:
SYSCALL(screen)
39b: b8 19 00 00 00 mov $0x19,%eax
3a0: cd 40 int $0x40
3a2: c3 ret
000003a3 <cls>:
SYSCALL(cls)
3a3: b8 1a 00 00 00 mov $0x1a,%eax
3a8: cd 40 int $0x40
3aa: c3 ret
3ab: 66 90 xchg %ax,%ax
3ad: 66 90 xchg %ax,%ax
3af: 90 nop
000003b0 <printint>:
static void putc(int fd, char c) {
write(fd, &c, 1);
}
static void printint(int fd, int xx, int base, int sgn) {
3b0: 55 push %ebp
3b1: 89 e5 mov %esp,%ebp
3b3: 57 push %edi
3b4: 56 push %esi
3b5: 53 push %ebx
3b6: 83 ec 3c sub $0x3c,%esp
3b9: 89 4d c4 mov %ecx,-0x3c(%ebp)
uint x;
neg = 0;
if (sgn && xx < 0) {
neg = 1;
x = -xx;
3bc: 89 d1 mov %edx,%ecx
static void printint(int fd, int xx, int base, int sgn) {
3be: 89 45 b8 mov %eax,-0x48(%ebp)
if (sgn && xx < 0) {
3c1: 85 d2 test %edx,%edx
3c3: 0f 89 7f 00 00 00 jns 448 <printint+0x98>
3c9: f6 45 08 01 testb $0x1,0x8(%ebp)
3cd: 74 79 je 448 <printint+0x98>
neg = 1;
3cf: c7 45 bc 01 00 00 00 movl $0x1,-0x44(%ebp)
x = -xx;
3d6: f7 d9 neg %ecx
}
else {
x = xx;
}
i = 0;
3d8: 31 db xor %ebx,%ebx
3da: 8d 75 d7 lea -0x29(%ebp),%esi
3dd: 8d 76 00 lea 0x0(%esi),%esi
do {
buf[i++] = digits[x % base];
3e0: 89 c8 mov %ecx,%eax
3e2: 31 d2 xor %edx,%edx
3e4: 89 cf mov %ecx,%edi
3e6: f7 75 c4 divl -0x3c(%ebp)
3e9: 0f b6 92 0c 08 00 00 movzbl 0x80c(%edx),%edx
3f0: 89 45 c0 mov %eax,-0x40(%ebp)
3f3: 89 d8 mov %ebx,%eax
3f5: 8d 5b 01 lea 0x1(%ebx),%ebx
}
while ((x /= base) != 0);
3f8: 8b 4d c0 mov -0x40(%ebp),%ecx
buf[i++] = digits[x % base];
3fb: 88 14 1e mov %dl,(%esi,%ebx,1)
while ((x /= base) != 0);
3fe: 39 7d c4 cmp %edi,-0x3c(%ebp)
401: 76 dd jbe 3e0 <printint+0x30>
if (neg) {
403: 8b 4d bc mov -0x44(%ebp),%ecx
406: 85 c9 test %ecx,%ecx
408: 74 0c je 416 <printint+0x66>
buf[i++] = '-';
40a: c6 44 1d d8 2d movb $0x2d,-0x28(%ebp,%ebx,1)
buf[i++] = digits[x % base];
40f: 89 d8 mov %ebx,%eax
buf[i++] = '-';
411: ba 2d 00 00 00 mov $0x2d,%edx
}
while (--i >= 0) {
416: 8b 7d b8 mov -0x48(%ebp),%edi
419: 8d 5c 05 d7 lea -0x29(%ebp,%eax,1),%ebx
41d: eb 07 jmp 426 <printint+0x76>
41f: 90 nop
putc(fd, buf[i]);
420: 0f b6 13 movzbl (%ebx),%edx
423: 83 eb 01 sub $0x1,%ebx
write(fd, &c, 1);
426: 83 ec 04 sub $0x4,%esp
429: 88 55 d7 mov %dl,-0x29(%ebp)
42c: 6a 01 push $0x1
42e: 56 push %esi
42f: 57 push %edi
430: e8 1e ff ff ff call 353 <write>
while (--i >= 0) {
435: 83 c4 10 add $0x10,%esp
438: 39 de cmp %ebx,%esi
43a: 75 e4 jne 420 <printint+0x70>
}
}
43c: 8d 65 f4 lea -0xc(%ebp),%esp
43f: 5b pop %ebx
440: 5e pop %esi
441: 5f pop %edi
442: 5d pop %ebp
443: c3 ret
444: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
neg = 0;
448: c7 45 bc 00 00 00 00 movl $0x0,-0x44(%ebp)
44f: eb 87 jmp 3d8 <printint+0x28>
451: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
458: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
45f: 90 nop
00000460 <printf>:
// Print to the given fd. Only understands %d, %x, %p, %s.
void printf(int fd, const char *fmt, ...) {
460: 55 push %ebp
461: 89 e5 mov %esp,%ebp
463: 57 push %edi
464: 56 push %esi
465: 53 push %ebx
466: 83 ec 2c sub $0x2c,%esp
int c, i, state;
uint *ap;
state = 0;
ap = (uint*)(void*)&fmt + 1;
for (i = 0; fmt[i]; i++) {
469: 8b 5d 0c mov 0xc(%ebp),%ebx
void printf(int fd, const char *fmt, ...) {
46c: 8b 75 08 mov 0x8(%ebp),%esi
for (i = 0; fmt[i]; i++) {
46f: 0f b6 13 movzbl (%ebx),%edx
472: 84 d2 test %dl,%dl
474: 74 6a je 4e0 <printf+0x80>
ap = (uint*)(void*)&fmt + 1;
476: 8d 45 10 lea 0x10(%ebp),%eax
479: 83 c3 01 add $0x1,%ebx
write(fd, &c, 1);
47c: 8d 7d e7 lea -0x19(%ebp),%edi
state = 0;
47f: 31 c9 xor %ecx,%ecx
ap = (uint*)(void*)&fmt + 1;
481: 89 45 d0 mov %eax,-0x30(%ebp)
484: eb 36 jmp 4bc <printf+0x5c>
486: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
48d: 8d 76 00 lea 0x0(%esi),%esi
490: 89 4d d4 mov %ecx,-0x2c(%ebp)
c = fmt[i] & 0xff;
if (state == 0) {
if (c == '%') {
state = '%';
493: b9 25 00 00 00 mov $0x25,%ecx
if (c == '%') {
498: 83 f8 25 cmp $0x25,%eax
49b: 74 15 je 4b2 <printf+0x52>
write(fd, &c, 1);
49d: 83 ec 04 sub $0x4,%esp
4a0: 88 55 e7 mov %dl,-0x19(%ebp)
4a3: 6a 01 push $0x1
4a5: 57 push %edi
4a6: 56 push %esi
4a7: e8 a7 fe ff ff call 353 <write>
4ac: 8b 4d d4 mov -0x2c(%ebp),%ecx
}
else {
putc(fd, c);
4af: 83 c4 10 add $0x10,%esp
for (i = 0; fmt[i]; i++) {
4b2: 0f b6 13 movzbl (%ebx),%edx
4b5: 83 c3 01 add $0x1,%ebx
4b8: 84 d2 test %dl,%dl
4ba: 74 24 je 4e0 <printf+0x80>
c = fmt[i] & 0xff;
4bc: 0f b6 c2 movzbl %dl,%eax
if (state == 0) {
4bf: 85 c9 test %ecx,%ecx
4c1: 74 cd je 490 <printf+0x30>
}
}
else if (state == '%') {
4c3: 83 f9 25 cmp $0x25,%ecx
4c6: 75 ea jne 4b2 <printf+0x52>
if (c == 'd') {
4c8: 83 f8 25 cmp $0x25,%eax
4cb: 0f 84 07 01 00 00 je 5d8 <printf+0x178>
4d1: 83 e8 63 sub $0x63,%eax
4d4: 83 f8 15 cmp $0x15,%eax
4d7: 77 17 ja 4f0 <printf+0x90>
4d9: ff 24 85 b4 07 00 00 jmp *0x7b4(,%eax,4)
putc(fd, c);
}
state = 0;
}
}
}
4e0: 8d 65 f4 lea -0xc(%ebp),%esp
4e3: 5b pop %ebx
4e4: 5e pop %esi
4e5: 5f pop %edi
4e6: 5d pop %ebp
4e7: c3 ret
4e8: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
4ef: 90 nop
write(fd, &c, 1);
4f0: 83 ec 04 sub $0x4,%esp
4f3: 88 55 d4 mov %dl,-0x2c(%ebp)
4f6: 6a 01 push $0x1
4f8: 57 push %edi
4f9: 56 push %esi
4fa: c6 45 e7 25 movb $0x25,-0x19(%ebp)
4fe: e8 50 fe ff ff call 353 <write>
putc(fd, c);
503: 0f b6 55 d4 movzbl -0x2c(%ebp),%edx
write(fd, &c, 1);
507: 83 c4 0c add $0xc,%esp
50a: 88 55 e7 mov %dl,-0x19(%ebp)
50d: 6a 01 push $0x1
50f: 57 push %edi
510: 56 push %esi
511: e8 3d fe ff ff call 353 <write>
putc(fd, c);
516: 83 c4 10 add $0x10,%esp
state = 0;
519: 31 c9 xor %ecx,%ecx
51b: eb 95 jmp 4b2 <printf+0x52>
51d: 8d 76 00 lea 0x0(%esi),%esi
printint(fd, *ap, 16, 0);
520: 83 ec 0c sub $0xc,%esp
523: b9 10 00 00 00 mov $0x10,%ecx
528: 6a 00 push $0x0
52a: 8b 45 d0 mov -0x30(%ebp),%eax
52d: 8b 10 mov (%eax),%edx
52f: 89 f0 mov %esi,%eax
531: e8 7a fe ff ff call 3b0 <printint>
ap++;
536: 83 45 d0 04 addl $0x4,-0x30(%ebp)
53a: 83 c4 10 add $0x10,%esp
state = 0;
53d: 31 c9 xor %ecx,%ecx
53f: e9 6e ff ff ff jmp 4b2 <printf+0x52>
544: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
s = (char*)*ap;
548: 8b 45 d0 mov -0x30(%ebp),%eax
54b: 8b 10 mov (%eax),%edx
ap++;
54d: 83 c0 04 add $0x4,%eax
550: 89 45 d0 mov %eax,-0x30(%ebp)
if (s == 0) {
553: 85 d2 test %edx,%edx
555: 0f 84 8d 00 00 00 je 5e8 <printf+0x188>
while (*s != 0) {
55b: 0f b6 02 movzbl (%edx),%eax
state = 0;
55e: 31 c9 xor %ecx,%ecx
while (*s != 0) {
560: 84 c0 test %al,%al
562: 0f 84 4a ff ff ff je 4b2 <printf+0x52>
568: 89 5d d4 mov %ebx,-0x2c(%ebp)
56b: 89 d3 mov %edx,%ebx
56d: 8d 76 00 lea 0x0(%esi),%esi
write(fd, &c, 1);
570: 83 ec 04 sub $0x4,%esp
s++;
573: 83 c3 01 add $0x1,%ebx
576: 88 45 e7 mov %al,-0x19(%ebp)
write(fd, &c, 1);
579: 6a 01 push $0x1
57b: 57 push %edi
57c: 56 push %esi
57d: e8 d1 fd ff ff call 353 <write>
while (*s != 0) {
582: 0f b6 03 movzbl (%ebx),%eax
585: 83 c4 10 add $0x10,%esp
588: 84 c0 test %al,%al
58a: 75 e4 jne 570 <printf+0x110>
state = 0;
58c: 8b 5d d4 mov -0x2c(%ebp),%ebx
58f: 31 c9 xor %ecx,%ecx
591: e9 1c ff ff ff jmp 4b2 <printf+0x52>
596: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
59d: 8d 76 00 lea 0x0(%esi),%esi
printint(fd, *ap, 10, 1);
5a0: 83 ec 0c sub $0xc,%esp
5a3: b9 0a 00 00 00 mov $0xa,%ecx
5a8: 6a 01 push $0x1
5aa: e9 7b ff ff ff jmp 52a <printf+0xca>
5af: 90 nop
putc(fd, *ap);
5b0: 8b 45 d0 mov -0x30(%ebp),%eax
write(fd, &c, 1);
5b3: 83 ec 04 sub $0x4,%esp
putc(fd, *ap);
5b6: 8b 00 mov (%eax),%eax
write(fd, &c, 1);
5b8: 6a 01 push $0x1
5ba: 57 push %edi
5bb: 56 push %esi
putc(fd, *ap);
5bc: 88 45 e7 mov %al,-0x19(%ebp)
write(fd, &c, 1);
5bf: e8 8f fd ff ff call 353 <write>
ap++;
5c4: 83 45 d0 04 addl $0x4,-0x30(%ebp)
5c8: 83 c4 10 add $0x10,%esp
state = 0;
5cb: 31 c9 xor %ecx,%ecx
5cd: e9 e0 fe ff ff jmp 4b2 <printf+0x52>
5d2: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
putc(fd, c);
5d8: 88 55 e7 mov %dl,-0x19(%ebp)
write(fd, &c, 1);
5db: 83 ec 04 sub $0x4,%esp
5de: e9 2a ff ff ff jmp 50d <printf+0xad>
5e3: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
5e7: 90 nop
s = "(null)";
5e8: ba ac 07 00 00 mov $0x7ac,%edx
while (*s != 0) {
5ed: 89 5d d4 mov %ebx,-0x2c(%ebp)
5f0: b8 28 00 00 00 mov $0x28,%eax
5f5: 89 d3 mov %edx,%ebx
5f7: e9 74 ff ff ff jmp 570 <printf+0x110>
5fc: 66 90 xchg %ax,%ax
5fe: 66 90 xchg %ax,%ax
00000600 <free>:
typedef union header Header;
static Header base;
static Header *freep;
void free(void *ap) {
600: 55 push %ebp
Header *bp, *p;
bp = (Header*)ap - 1;
for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
601: a1 c0 0a 00 00 mov 0xac0,%eax
void free(void *ap) {
606: 89 e5 mov %esp,%ebp
608: 57 push %edi
609: 56 push %esi
60a: 53 push %ebx
60b: 8b 5d 08 mov 0x8(%ebp),%ebx
bp = (Header*)ap - 1;
60e: 8d 4b f8 lea -0x8(%ebx),%ecx
for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
611: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
618: 89 c2 mov %eax,%edx
61a: 8b 00 mov (%eax),%eax
61c: 39 ca cmp %ecx,%edx
61e: 73 30 jae 650 <free+0x50>
620: 39 c1 cmp %eax,%ecx
622: 72 04 jb 628 <free+0x28>
if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
624: 39 c2 cmp %eax,%edx
626: 72 f0 jb 618 <free+0x18>
break;
}
}
if (bp + bp->s.size == p->s.ptr) {
628: 8b 73 fc mov -0x4(%ebx),%esi
62b: 8d 3c f1 lea (%ecx,%esi,8),%edi
62e: 39 f8 cmp %edi,%eax
630: 74 30 je 662 <free+0x62>
bp->s.size += p->s.ptr->s.size;
bp->s.ptr = p->s.ptr->s.ptr;
632: 89 43 f8 mov %eax,-0x8(%ebx)
}
else {
bp->s.ptr = p->s.ptr;
}
if (p + p->s.size == bp) {
635: 8b 42 04 mov 0x4(%edx),%eax
638: 8d 34 c2 lea (%edx,%eax,8),%esi
63b: 39 f1 cmp %esi,%ecx
63d: 74 3a je 679 <free+0x79>
p->s.size += bp->s.size;
p->s.ptr = bp->s.ptr;
63f: 89 0a mov %ecx,(%edx)
}
else {
p->s.ptr = bp;
}
freep = p;
}
641: 5b pop %ebx
freep = p;
642: 89 15 c0 0a 00 00 mov %edx,0xac0
}
648: 5e pop %esi
649: 5f pop %edi
64a: 5d pop %ebp
64b: c3 ret
64c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
650: 39 c2 cmp %eax,%edx
652: 72 c4 jb 618 <free+0x18>
654: 39 c1 cmp %eax,%ecx
656: 73 c0 jae 618 <free+0x18>
if (bp + bp->s.size == p->s.ptr) {
658: 8b 73 fc mov -0x4(%ebx),%esi
65b: 8d 3c f1 lea (%ecx,%esi,8),%edi
65e: 39 f8 cmp %edi,%eax
660: 75 d0 jne 632 <free+0x32>
bp->s.size += p->s.ptr->s.size;
662: 03 70 04 add 0x4(%eax),%esi
665: 89 73 fc mov %esi,-0x4(%ebx)
bp->s.ptr = p->s.ptr->s.ptr;
668: 8b 02 mov (%edx),%eax
66a: 8b 00 mov (%eax),%eax
66c: 89 43 f8 mov %eax,-0x8(%ebx)
if (p + p->s.size == bp) {
66f: 8b 42 04 mov 0x4(%edx),%eax
672: 8d 34 c2 lea (%edx,%eax,8),%esi
675: 39 f1 cmp %esi,%ecx
677: 75 c6 jne 63f <free+0x3f>
p->s.size += bp->s.size;
679: 03 43 fc add -0x4(%ebx),%eax
freep = p;
67c: 89 15 c0 0a 00 00 mov %edx,0xac0
p->s.size += bp->s.size;
682: 89 42 04 mov %eax,0x4(%edx)
p->s.ptr = bp->s.ptr;
685: 8b 4b f8 mov -0x8(%ebx),%ecx
688: 89 0a mov %ecx,(%edx)
}
68a: 5b pop %ebx
68b: 5e pop %esi
68c: 5f pop %edi
68d: 5d pop %ebp
68e: c3 ret
68f: 90 nop
00000690 <malloc>:
hp->s.size = nu;
free((void*)(hp + 1));
return freep;
}
void* malloc(uint nbytes) {
690: 55 push %ebp
691: 89 e5 mov %esp,%ebp
693: 57 push %edi
694: 56 push %esi
695: 53 push %ebx
696: 83 ec 1c sub $0x1c,%esp
Header *p, *prevp;
uint nunits;
nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
699: 8b 45 08 mov 0x8(%ebp),%eax
if ((prevp = freep) == 0) {
69c: 8b 3d c0 0a 00 00 mov 0xac0,%edi
nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
6a2: 8d 70 07 lea 0x7(%eax),%esi
6a5: c1 ee 03 shr $0x3,%esi
6a8: 83 c6 01 add $0x1,%esi
if ((prevp = freep) == 0) {
6ab: 85 ff test %edi,%edi
6ad: 0f 84 9d 00 00 00 je 750 <malloc+0xc0>
base.s.ptr = freep = prevp = &base;
base.s.size = 0;
}
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
6b3: 8b 17 mov (%edi),%edx
if (p->s.size >= nunits) {
6b5: 8b 4a 04 mov 0x4(%edx),%ecx
6b8: 39 f1 cmp %esi,%ecx
6ba: 73 6a jae 726 <malloc+0x96>
6bc: bb 00 10 00 00 mov $0x1000,%ebx
6c1: 39 de cmp %ebx,%esi
6c3: 0f 43 de cmovae %esi,%ebx
p = sbrk(nu * sizeof(Header));
6c6: 8d 04 dd 00 00 00 00 lea 0x0(,%ebx,8),%eax
6cd: 89 45 e4 mov %eax,-0x1c(%ebp)
6d0: eb 17 jmp 6e9 <malloc+0x59>
6d2: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
6d8: 8b 02 mov (%edx),%eax
if (p->s.size >= nunits) {
6da: 8b 48 04 mov 0x4(%eax),%ecx
6dd: 39 f1 cmp %esi,%ecx
6df: 73 4f jae 730 <malloc+0xa0>
p->s.size = nunits;
}
freep = prevp;
return (void*)(p + 1);
}
if (p == freep) {
6e1: 8b 3d c0 0a 00 00 mov 0xac0,%edi
6e7: 89 c2 mov %eax,%edx
6e9: 39 d7 cmp %edx,%edi
6eb: 75 eb jne 6d8 <malloc+0x48>
p = sbrk(nu * sizeof(Header));
6ed: 83 ec 0c sub $0xc,%esp
6f0: ff 75 e4 push -0x1c(%ebp)
6f3: e8 3b fc ff ff call 333 <sbrk>
if (p == (char*)-1) {
6f8: 83 c4 10 add $0x10,%esp
6fb: 83 f8 ff cmp $0xffffffff,%eax
6fe: 74 1c je 71c <malloc+0x8c>
hp->s.size = nu;
700: 89 58 04 mov %ebx,0x4(%eax)
free((void*)(hp + 1));
703: 83 ec 0c sub $0xc,%esp
706: 83 c0 08 add $0x8,%eax
709: 50 push %eax
70a: e8 f1 fe ff ff call 600 <free>
return freep;
70f: 8b 15 c0 0a 00 00 mov 0xac0,%edx
if ((p = morecore(nunits)) == 0) {
715: 83 c4 10 add $0x10,%esp
718: 85 d2 test %edx,%edx
71a: 75 bc jne 6d8 <malloc+0x48>
return 0;
}
}
}
}
71c: 8d 65 f4 lea -0xc(%ebp),%esp
return 0;
71f: 31 c0 xor %eax,%eax
}
721: 5b pop %ebx
722: 5e pop %esi
723: 5f pop %edi
724: 5d pop %ebp
725: c3 ret
if (p->s.size >= nunits) {
726: 89 d0 mov %edx,%eax
728: 89 fa mov %edi,%edx
72a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
if (p->s.size == nunits) {
730: 39 ce cmp %ecx,%esi
732: 74 4c je 780 <malloc+0xf0>
p->s.size -= nunits;
734: 29 f1 sub %esi,%ecx
736: 89 48 04 mov %ecx,0x4(%eax)
p += p->s.size;
739: 8d 04 c8 lea (%eax,%ecx,8),%eax
p->s.size = nunits;
73c: 89 70 04 mov %esi,0x4(%eax)
freep = prevp;
73f: 89 15 c0 0a 00 00 mov %edx,0xac0
}
745: 8d 65 f4 lea -0xc(%ebp),%esp
return (void*)(p + 1);
748: 83 c0 08 add $0x8,%eax
}
74b: 5b pop %ebx
74c: 5e pop %esi
74d: 5f pop %edi
74e: 5d pop %ebp
74f: c3 ret
base.s.ptr = freep = prevp = &base;
750: c7 05 c0 0a 00 00 c4 movl $0xac4,0xac0
757: 0a 00 00
base.s.size = 0;
75a: bf c4 0a 00 00 mov $0xac4,%edi
base.s.ptr = freep = prevp = &base;
75f: c7 05 c4 0a 00 00 c4 movl $0xac4,0xac4
766: 0a 00 00
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
769: 89 fa mov %edi,%edx
base.s.size = 0;
76b: c7 05 c8 0a 00 00 00 movl $0x0,0xac8
772: 00 00 00
if (p->s.size >= nunits) {
775: e9 42 ff ff ff jmp 6bc <malloc+0x2c>
77a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
prevp->s.ptr = p->s.ptr;
780: 8b 08 mov (%eax),%ecx
782: 89 0a mov %ecx,(%edx)
784: eb b9 jmp 73f <malloc+0xaf>