Files
xv6-custom-os/rm.asm

1203 lines
41 KiB
NASM

_rm: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
#include "types.h"
#include "stat.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: bf 01 00 00 00 mov $0x1,%edi
13: 56 push %esi
14: 53 push %ebx
15: 51 push %ecx
16: 83 ec 08 sub $0x8,%esp
19: 8b 59 04 mov 0x4(%ecx),%ebx
1c: 8b 31 mov (%ecx),%esi
1e: 83 c3 04 add $0x4,%ebx
int i;
if (argc < 2) {
21: 83 fe 01 cmp $0x1,%esi
24: 7e 3e jle 64 <main+0x64>
26: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
2d: 8d 76 00 lea 0x0(%esi),%esi
printf(2, "Usage: rm files...\n");
exit();
}
for (i = 1; i < argc; i++) {
if (unlink(argv[i]) < 0) {
30: 83 ec 0c sub $0xc,%esp
33: ff 33 push (%ebx)
35: e8 19 03 00 00 call 353 <unlink>
3a: 83 c4 10 add $0x10,%esp
3d: 85 c0 test %eax,%eax
3f: 78 0f js 50 <main+0x50>
for (i = 1; i < argc; i++) {
41: 83 c7 01 add $0x1,%edi
44: 83 c3 04 add $0x4,%ebx
47: 39 fe cmp %edi,%esi
49: 75 e5 jne 30 <main+0x30>
printf(2, "rm: %s failed to delete\n", argv[i]);
break;
}
}
exit();
4b: e8 83 02 00 00 call 2d3 <exit>
printf(2, "rm: %s failed to delete\n", argv[i]);
50: 50 push %eax
51: ff 33 push (%ebx)
53: 68 8c 07 00 00 push $0x78c
58: 6a 02 push $0x2
5a: e8 f1 03 00 00 call 450 <printf>
break;
5f: 83 c4 10 add $0x10,%esp
62: eb e7 jmp 4b <main+0x4b>
printf(2, "Usage: rm files...\n");
64: 52 push %edx
65: 52 push %edx
66: 68 78 07 00 00 push $0x778
6b: 6a 02 push $0x2
6d: e8 de 03 00 00 call 450 <printf>
exit();
72: e8 5c 02 00 00 call 2d3 <exit>
77: 66 90 xchg %ax,%ax
79: 66 90 xchg %ax,%ax
7b: 66 90 xchg %ax,%ax
7d: 66 90 xchg %ax,%ax
7f: 90 nop
00000080 <strcpy>:
#include "stat.h"
#include "fcntl.h"
#include "user.h"
#include "x86.h"
char*strcpy(char *s, const char *t) {
80: 55 push %ebp
char *os;
os = s;
while ((*s++ = *t++) != 0) {
81: 31 c0 xor %eax,%eax
char*strcpy(char *s, const char *t) {
83: 89 e5 mov %esp,%ebp
85: 53 push %ebx
86: 8b 4d 08 mov 0x8(%ebp),%ecx
89: 8b 5d 0c mov 0xc(%ebp),%ebx
8c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
while ((*s++ = *t++) != 0) {
90: 0f b6 14 03 movzbl (%ebx,%eax,1),%edx
94: 88 14 01 mov %dl,(%ecx,%eax,1)
97: 83 c0 01 add $0x1,%eax
9a: 84 d2 test %dl,%dl
9c: 75 f2 jne 90 <strcpy+0x10>
;
}
return os;
}
9e: 8b 5d fc mov -0x4(%ebp),%ebx
a1: 89 c8 mov %ecx,%eax
a3: c9 leave
a4: c3 ret
a5: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
ac: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
000000b0 <strcmp>:
int strcmp(const char *p, const char *q) {
b0: 55 push %ebp
b1: 89 e5 mov %esp,%ebp
b3: 53 push %ebx
b4: 8b 55 08 mov 0x8(%ebp),%edx
b7: 8b 4d 0c mov 0xc(%ebp),%ecx
while (*p && *p == *q) {
ba: 0f b6 02 movzbl (%edx),%eax
bd: 84 c0 test %al,%al
bf: 75 17 jne d8 <strcmp+0x28>
c1: eb 3a jmp fd <strcmp+0x4d>
c3: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
c7: 90 nop
c8: 0f b6 42 01 movzbl 0x1(%edx),%eax
p++, q++;
cc: 83 c2 01 add $0x1,%edx
cf: 8d 59 01 lea 0x1(%ecx),%ebx
while (*p && *p == *q) {
d2: 84 c0 test %al,%al
d4: 74 1a je f0 <strcmp+0x40>
p++, q++;
d6: 89 d9 mov %ebx,%ecx
while (*p && *p == *q) {
d8: 0f b6 19 movzbl (%ecx),%ebx
db: 38 c3 cmp %al,%bl
dd: 74 e9 je c8 <strcmp+0x18>
}
return (uchar) * p - (uchar) * q;
df: 29 d8 sub %ebx,%eax
}
e1: 8b 5d fc mov -0x4(%ebp),%ebx
e4: c9 leave
e5: c3 ret
e6: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
ed: 8d 76 00 lea 0x0(%esi),%esi
return (uchar) * p - (uchar) * q;
f0: 0f b6 59 01 movzbl 0x1(%ecx),%ebx
f4: 31 c0 xor %eax,%eax
f6: 29 d8 sub %ebx,%eax
}
f8: 8b 5d fc mov -0x4(%ebp),%ebx
fb: c9 leave
fc: c3 ret
return (uchar) * p - (uchar) * q;
fd: 0f b6 19 movzbl (%ecx),%ebx
100: 31 c0 xor %eax,%eax
102: eb db jmp df <strcmp+0x2f>
104: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
10b: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
10f: 90 nop
00000110 <strlen>:
uint strlen(const char *s) {
110: 55 push %ebp
111: 89 e5 mov %esp,%ebp
113: 8b 55 08 mov 0x8(%ebp),%edx
int n;
for (n = 0; s[n]; n++) {
116: 80 3a 00 cmpb $0x0,(%edx)
119: 74 15 je 130 <strlen+0x20>
11b: 31 c0 xor %eax,%eax
11d: 8d 76 00 lea 0x0(%esi),%esi
120: 83 c0 01 add $0x1,%eax
123: 80 3c 02 00 cmpb $0x0,(%edx,%eax,1)
127: 89 c1 mov %eax,%ecx
129: 75 f5 jne 120 <strlen+0x10>
;
}
return n;
}
12b: 89 c8 mov %ecx,%eax
12d: 5d pop %ebp
12e: c3 ret
12f: 90 nop
for (n = 0; s[n]; n++) {
130: 31 c9 xor %ecx,%ecx
}
132: 5d pop %ebp
133: 89 c8 mov %ecx,%eax
135: c3 ret
136: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
13d: 8d 76 00 lea 0x0(%esi),%esi
00000140 <memset>:
void* memset(void *dst, int c, uint n) {
140: 55 push %ebp
141: 89 e5 mov %esp,%ebp
143: 57 push %edi
144: 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" :
147: 8b 4d 10 mov 0x10(%ebp),%ecx
14a: 8b 45 0c mov 0xc(%ebp),%eax
14d: 89 d7 mov %edx,%edi
14f: fc cld
150: f3 aa rep stos %al,%es:(%edi)
stosb(dst, c, n);
return dst;
}
152: 8b 7d fc mov -0x4(%ebp),%edi
155: 89 d0 mov %edx,%eax
157: c9 leave
158: c3 ret
159: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
00000160 <strchr>:
char* strchr(const char *s, char c) {
160: 55 push %ebp
161: 89 e5 mov %esp,%ebp
163: 8b 45 08 mov 0x8(%ebp),%eax
166: 0f b6 4d 0c movzbl 0xc(%ebp),%ecx
for (; *s; s++) {
16a: 0f b6 10 movzbl (%eax),%edx
16d: 84 d2 test %dl,%dl
16f: 75 12 jne 183 <strchr+0x23>
171: eb 1d jmp 190 <strchr+0x30>
173: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
177: 90 nop
178: 0f b6 50 01 movzbl 0x1(%eax),%edx
17c: 83 c0 01 add $0x1,%eax
17f: 84 d2 test %dl,%dl
181: 74 0d je 190 <strchr+0x30>
if (*s == c) {
183: 38 d1 cmp %dl,%cl
185: 75 f1 jne 178 <strchr+0x18>
return (char*)s;
}
}
return 0;
}
187: 5d pop %ebp
188: c3 ret
189: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
return 0;
190: 31 c0 xor %eax,%eax
}
192: 5d pop %ebp
193: c3 ret
194: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
19b: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
19f: 90 nop
000001a0 <gets>:
char* gets(char *buf, int max) {
1a0: 55 push %ebp
1a1: 89 e5 mov %esp,%ebp
1a3: 57 push %edi
1a4: 56 push %esi
int i, cc;
char c;
for (i = 0; i + 1 < max;) {
cc = read(0, &c, 1);
1a5: 8d 7d e7 lea -0x19(%ebp),%edi
char* gets(char *buf, int max) {
1a8: 53 push %ebx
for (i = 0; i + 1 < max;) {
1a9: 31 db xor %ebx,%ebx
char* gets(char *buf, int max) {
1ab: 83 ec 1c sub $0x1c,%esp
for (i = 0; i + 1 < max;) {
1ae: eb 27 jmp 1d7 <gets+0x37>
cc = read(0, &c, 1);
1b0: 83 ec 04 sub $0x4,%esp
1b3: 6a 01 push $0x1
1b5: 57 push %edi
1b6: 6a 00 push $0x0
1b8: e8 2e 01 00 00 call 2eb <read>
if (cc < 1) {
1bd: 83 c4 10 add $0x10,%esp
1c0: 85 c0 test %eax,%eax
1c2: 7e 1d jle 1e1 <gets+0x41>
break;
}
buf[i++] = c;
1c4: 0f b6 45 e7 movzbl -0x19(%ebp),%eax
1c8: 8b 55 08 mov 0x8(%ebp),%edx
1cb: 88 44 1a ff mov %al,-0x1(%edx,%ebx,1)
if (c == '\n' || c == '\r') {
1cf: 3c 0a cmp $0xa,%al
1d1: 74 1d je 1f0 <gets+0x50>
1d3: 3c 0d cmp $0xd,%al
1d5: 74 19 je 1f0 <gets+0x50>
for (i = 0; i + 1 < max;) {
1d7: 89 de mov %ebx,%esi
1d9: 83 c3 01 add $0x1,%ebx
1dc: 3b 5d 0c cmp 0xc(%ebp),%ebx
1df: 7c cf jl 1b0 <gets+0x10>
break;
}
}
buf[i] = '\0';
1e1: 8b 45 08 mov 0x8(%ebp),%eax
1e4: c6 04 30 00 movb $0x0,(%eax,%esi,1)
return buf;
}
1e8: 8d 65 f4 lea -0xc(%ebp),%esp
1eb: 5b pop %ebx
1ec: 5e pop %esi
1ed: 5f pop %edi
1ee: 5d pop %ebp
1ef: c3 ret
buf[i] = '\0';
1f0: 8b 45 08 mov 0x8(%ebp),%eax
1f3: 89 de mov %ebx,%esi
1f5: c6 04 30 00 movb $0x0,(%eax,%esi,1)
}
1f9: 8d 65 f4 lea -0xc(%ebp),%esp
1fc: 5b pop %ebx
1fd: 5e pop %esi
1fe: 5f pop %edi
1ff: 5d pop %ebp
200: c3 ret
201: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
208: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
20f: 90 nop
00000210 <stat>:
int stat(const char *n, struct stat *st) {
210: 55 push %ebp
211: 89 e5 mov %esp,%ebp
213: 56 push %esi
214: 53 push %ebx
int fd;
int r;
fd = open(n, O_RDONLY);
215: 83 ec 08 sub $0x8,%esp
218: 6a 00 push $0x0
21a: ff 75 08 push 0x8(%ebp)
21d: e8 19 01 00 00 call 33b <open>
if (fd < 0) {
222: 83 c4 10 add $0x10,%esp
225: 85 c0 test %eax,%eax
227: 78 27 js 250 <stat+0x40>
return -1;
}
r = fstat(fd, st);
229: 83 ec 08 sub $0x8,%esp
22c: ff 75 0c push 0xc(%ebp)
22f: 89 c3 mov %eax,%ebx
231: 50 push %eax
232: e8 cc 00 00 00 call 303 <fstat>
close(fd);
237: 89 1c 24 mov %ebx,(%esp)
r = fstat(fd, st);
23a: 89 c6 mov %eax,%esi
close(fd);
23c: e8 2a 01 00 00 call 36b <close>
return r;
241: 83 c4 10 add $0x10,%esp
}
244: 8d 65 f8 lea -0x8(%ebp),%esp
247: 89 f0 mov %esi,%eax
249: 5b pop %ebx
24a: 5e pop %esi
24b: 5d pop %ebp
24c: c3 ret
24d: 8d 76 00 lea 0x0(%esi),%esi
return -1;
250: be ff ff ff ff mov $0xffffffff,%esi
255: eb ed jmp 244 <stat+0x34>
257: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
25e: 66 90 xchg %ax,%ax
00000260 <atoi>:
int atoi(const char *s) {
260: 55 push %ebp
261: 89 e5 mov %esp,%ebp
263: 53 push %ebx
264: 8b 55 08 mov 0x8(%ebp),%edx
int n;
n = 0;
while ('0' <= *s && *s <= '9') {
267: 0f be 02 movsbl (%edx),%eax
26a: 8d 48 d0 lea -0x30(%eax),%ecx
26d: 80 f9 09 cmp $0x9,%cl
n = 0;
270: b9 00 00 00 00 mov $0x0,%ecx
while ('0' <= *s && *s <= '9') {
275: 77 1e ja 295 <atoi+0x35>
277: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
27e: 66 90 xchg %ax,%ax
n = n * 10 + *s++ - '0';
280: 83 c2 01 add $0x1,%edx
283: 8d 0c 89 lea (%ecx,%ecx,4),%ecx
286: 8d 4c 48 d0 lea -0x30(%eax,%ecx,2),%ecx
while ('0' <= *s && *s <= '9') {
28a: 0f be 02 movsbl (%edx),%eax
28d: 8d 58 d0 lea -0x30(%eax),%ebx
290: 80 fb 09 cmp $0x9,%bl
293: 76 eb jbe 280 <atoi+0x20>
}
return n;
}
295: 8b 5d fc mov -0x4(%ebp),%ebx
298: 89 c8 mov %ecx,%eax
29a: c9 leave
29b: c3 ret
29c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
000002a0 <memmove>:
void* memmove(void *vdst, const void *vsrc, int n) {
2a0: 55 push %ebp
2a1: 89 e5 mov %esp,%ebp
2a3: 57 push %edi
2a4: 8b 45 10 mov 0x10(%ebp),%eax
2a7: 8b 55 08 mov 0x8(%ebp),%edx
2aa: 56 push %esi
2ab: 8b 75 0c mov 0xc(%ebp),%esi
char *dst;
const char *src;
dst = vdst;
src = vsrc;
while (n-- > 0) {
2ae: 85 c0 test %eax,%eax
2b0: 7e 13 jle 2c5 <memmove+0x25>
2b2: 01 d0 add %edx,%eax
dst = vdst;
2b4: 89 d7 mov %edx,%edi
2b6: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
2bd: 8d 76 00 lea 0x0(%esi),%esi
*dst++ = *src++;
2c0: a4 movsb %ds:(%esi),%es:(%edi)
while (n-- > 0) {
2c1: 39 f8 cmp %edi,%eax
2c3: 75 fb jne 2c0 <memmove+0x20>
}
return vdst;
}
2c5: 5e pop %esi
2c6: 89 d0 mov %edx,%eax
2c8: 5f pop %edi
2c9: 5d pop %ebp
2ca: c3 ret
000002cb <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
2cb: b8 01 00 00 00 mov $0x1,%eax
2d0: cd 40 int $0x40
2d2: c3 ret
000002d3 <exit>:
SYSCALL(exit)
2d3: b8 02 00 00 00 mov $0x2,%eax
2d8: cd 40 int $0x40
2da: c3 ret
000002db <wait>:
SYSCALL(wait)
2db: b8 03 00 00 00 mov $0x3,%eax
2e0: cd 40 int $0x40
2e2: c3 ret
000002e3 <pipe>:
SYSCALL(pipe)
2e3: b8 04 00 00 00 mov $0x4,%eax
2e8: cd 40 int $0x40
2ea: c3 ret
000002eb <read>:
SYSCALL(read)
2eb: b8 05 00 00 00 mov $0x5,%eax
2f0: cd 40 int $0x40
2f2: c3 ret
000002f3 <kill>:
SYSCALL(kill)
2f3: b8 06 00 00 00 mov $0x6,%eax
2f8: cd 40 int $0x40
2fa: c3 ret
000002fb <exec>:
SYSCALL(exec)
2fb: b8 07 00 00 00 mov $0x7,%eax
300: cd 40 int $0x40
302: c3 ret
00000303 <fstat>:
SYSCALL(fstat)
303: b8 08 00 00 00 mov $0x8,%eax
308: cd 40 int $0x40
30a: c3 ret
0000030b <chdir>:
SYSCALL(chdir)
30b: b8 09 00 00 00 mov $0x9,%eax
310: cd 40 int $0x40
312: c3 ret
00000313 <dup>:
SYSCALL(dup)
313: b8 0a 00 00 00 mov $0xa,%eax
318: cd 40 int $0x40
31a: c3 ret
0000031b <getpid>:
SYSCALL(getpid)
31b: b8 0b 00 00 00 mov $0xb,%eax
320: cd 40 int $0x40
322: c3 ret
00000323 <sbrk>:
SYSCALL(sbrk)
323: b8 0c 00 00 00 mov $0xc,%eax
328: cd 40 int $0x40
32a: c3 ret
0000032b <sleep>:
SYSCALL(sleep)
32b: b8 0d 00 00 00 mov $0xd,%eax
330: cd 40 int $0x40
332: c3 ret
00000333 <uptime>:
SYSCALL(uptime)
333: b8 0e 00 00 00 mov $0xe,%eax
338: cd 40 int $0x40
33a: c3 ret
0000033b <open>:
SYSCALL(open)
33b: b8 0f 00 00 00 mov $0xf,%eax
340: cd 40 int $0x40
342: c3 ret
00000343 <write>:
SYSCALL(write)
343: b8 10 00 00 00 mov $0x10,%eax
348: cd 40 int $0x40
34a: c3 ret
0000034b <mknod>:
SYSCALL(mknod)
34b: b8 11 00 00 00 mov $0x11,%eax
350: cd 40 int $0x40
352: c3 ret
00000353 <unlink>:
SYSCALL(unlink)
353: b8 12 00 00 00 mov $0x12,%eax
358: cd 40 int $0x40
35a: c3 ret
0000035b <link>:
SYSCALL(link)
35b: b8 13 00 00 00 mov $0x13,%eax
360: cd 40 int $0x40
362: c3 ret
00000363 <mkdir>:
SYSCALL(mkdir)
363: b8 14 00 00 00 mov $0x14,%eax
368: cd 40 int $0x40
36a: c3 ret
0000036b <close>:
SYSCALL(close)
36b: b8 15 00 00 00 mov $0x15,%eax
370: cd 40 int $0x40
372: c3 ret
00000373 <getch>:
SYSCALL(getch)
373: b8 16 00 00 00 mov $0x16,%eax
378: cd 40 int $0x40
37a: c3 ret
0000037b <greeting>:
SYSCALL(greeting)
37b: b8 17 00 00 00 mov $0x17,%eax
380: cd 40 int $0x40
382: c3 ret
00000383 <shutdown>:
SYSCALL(shutdown)
383: b8 18 00 00 00 mov $0x18,%eax
388: cd 40 int $0x40
38a: c3 ret
0000038b <screen>:
SYSCALL(screen)
38b: b8 19 00 00 00 mov $0x19,%eax
390: cd 40 int $0x40
392: c3 ret
00000393 <cls>:
SYSCALL(cls)
393: b8 1a 00 00 00 mov $0x1a,%eax
398: cd 40 int $0x40
39a: c3 ret
39b: 66 90 xchg %ax,%ax
39d: 66 90 xchg %ax,%ax
39f: 90 nop
000003a0 <printint>:
static void putc(int fd, char c) {
write(fd, &c, 1);
}
static void printint(int fd, int xx, int base, int sgn) {
3a0: 55 push %ebp
3a1: 89 e5 mov %esp,%ebp
3a3: 57 push %edi
3a4: 56 push %esi
3a5: 53 push %ebx
3a6: 83 ec 3c sub $0x3c,%esp
3a9: 89 4d c4 mov %ecx,-0x3c(%ebp)
uint x;
neg = 0;
if (sgn && xx < 0) {
neg = 1;
x = -xx;
3ac: 89 d1 mov %edx,%ecx
static void printint(int fd, int xx, int base, int sgn) {
3ae: 89 45 b8 mov %eax,-0x48(%ebp)
if (sgn && xx < 0) {
3b1: 85 d2 test %edx,%edx
3b3: 0f 89 7f 00 00 00 jns 438 <printint+0x98>
3b9: f6 45 08 01 testb $0x1,0x8(%ebp)
3bd: 74 79 je 438 <printint+0x98>
neg = 1;
3bf: c7 45 bc 01 00 00 00 movl $0x1,-0x44(%ebp)
x = -xx;
3c6: f7 d9 neg %ecx
}
else {
x = xx;
}
i = 0;
3c8: 31 db xor %ebx,%ebx
3ca: 8d 75 d7 lea -0x29(%ebp),%esi
3cd: 8d 76 00 lea 0x0(%esi),%esi
do {
buf[i++] = digits[x % base];
3d0: 89 c8 mov %ecx,%eax
3d2: 31 d2 xor %edx,%edx
3d4: 89 cf mov %ecx,%edi
3d6: f7 75 c4 divl -0x3c(%ebp)
3d9: 0f b6 92 04 08 00 00 movzbl 0x804(%edx),%edx
3e0: 89 45 c0 mov %eax,-0x40(%ebp)
3e3: 89 d8 mov %ebx,%eax
3e5: 8d 5b 01 lea 0x1(%ebx),%ebx
}
while ((x /= base) != 0);
3e8: 8b 4d c0 mov -0x40(%ebp),%ecx
buf[i++] = digits[x % base];
3eb: 88 14 1e mov %dl,(%esi,%ebx,1)
while ((x /= base) != 0);
3ee: 39 7d c4 cmp %edi,-0x3c(%ebp)
3f1: 76 dd jbe 3d0 <printint+0x30>
if (neg) {
3f3: 8b 4d bc mov -0x44(%ebp),%ecx
3f6: 85 c9 test %ecx,%ecx
3f8: 74 0c je 406 <printint+0x66>
buf[i++] = '-';
3fa: c6 44 1d d8 2d movb $0x2d,-0x28(%ebp,%ebx,1)
buf[i++] = digits[x % base];
3ff: 89 d8 mov %ebx,%eax
buf[i++] = '-';
401: ba 2d 00 00 00 mov $0x2d,%edx
}
while (--i >= 0) {
406: 8b 7d b8 mov -0x48(%ebp),%edi
409: 8d 5c 05 d7 lea -0x29(%ebp,%eax,1),%ebx
40d: eb 07 jmp 416 <printint+0x76>
40f: 90 nop
putc(fd, buf[i]);
410: 0f b6 13 movzbl (%ebx),%edx
413: 83 eb 01 sub $0x1,%ebx
write(fd, &c, 1);
416: 83 ec 04 sub $0x4,%esp
419: 88 55 d7 mov %dl,-0x29(%ebp)
41c: 6a 01 push $0x1
41e: 56 push %esi
41f: 57 push %edi
420: e8 1e ff ff ff call 343 <write>
while (--i >= 0) {
425: 83 c4 10 add $0x10,%esp
428: 39 de cmp %ebx,%esi
42a: 75 e4 jne 410 <printint+0x70>
}
}
42c: 8d 65 f4 lea -0xc(%ebp),%esp
42f: 5b pop %ebx
430: 5e pop %esi
431: 5f pop %edi
432: 5d pop %ebp
433: c3 ret
434: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
neg = 0;
438: c7 45 bc 00 00 00 00 movl $0x0,-0x44(%ebp)
43f: eb 87 jmp 3c8 <printint+0x28>
441: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
448: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
44f: 90 nop
00000450 <printf>:
// Print to the given fd. Only understands %d, %x, %p, %s.
void printf(int fd, const char *fmt, ...) {
450: 55 push %ebp
451: 89 e5 mov %esp,%ebp
453: 57 push %edi
454: 56 push %esi
455: 53 push %ebx
456: 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++) {
459: 8b 5d 0c mov 0xc(%ebp),%ebx
void printf(int fd, const char *fmt, ...) {
45c: 8b 75 08 mov 0x8(%ebp),%esi
for (i = 0; fmt[i]; i++) {
45f: 0f b6 13 movzbl (%ebx),%edx
462: 84 d2 test %dl,%dl
464: 74 6a je 4d0 <printf+0x80>
ap = (uint*)(void*)&fmt + 1;
466: 8d 45 10 lea 0x10(%ebp),%eax
469: 83 c3 01 add $0x1,%ebx
write(fd, &c, 1);
46c: 8d 7d e7 lea -0x19(%ebp),%edi
state = 0;
46f: 31 c9 xor %ecx,%ecx
ap = (uint*)(void*)&fmt + 1;
471: 89 45 d0 mov %eax,-0x30(%ebp)
474: eb 36 jmp 4ac <printf+0x5c>
476: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
47d: 8d 76 00 lea 0x0(%esi),%esi
480: 89 4d d4 mov %ecx,-0x2c(%ebp)
c = fmt[i] & 0xff;
if (state == 0) {
if (c == '%') {
state = '%';
483: b9 25 00 00 00 mov $0x25,%ecx
if (c == '%') {
488: 83 f8 25 cmp $0x25,%eax
48b: 74 15 je 4a2 <printf+0x52>
write(fd, &c, 1);
48d: 83 ec 04 sub $0x4,%esp
490: 88 55 e7 mov %dl,-0x19(%ebp)
493: 6a 01 push $0x1
495: 57 push %edi
496: 56 push %esi
497: e8 a7 fe ff ff call 343 <write>
49c: 8b 4d d4 mov -0x2c(%ebp),%ecx
}
else {
putc(fd, c);
49f: 83 c4 10 add $0x10,%esp
for (i = 0; fmt[i]; i++) {
4a2: 0f b6 13 movzbl (%ebx),%edx
4a5: 83 c3 01 add $0x1,%ebx
4a8: 84 d2 test %dl,%dl
4aa: 74 24 je 4d0 <printf+0x80>
c = fmt[i] & 0xff;
4ac: 0f b6 c2 movzbl %dl,%eax
if (state == 0) {
4af: 85 c9 test %ecx,%ecx
4b1: 74 cd je 480 <printf+0x30>
}
}
else if (state == '%') {
4b3: 83 f9 25 cmp $0x25,%ecx
4b6: 75 ea jne 4a2 <printf+0x52>
if (c == 'd') {
4b8: 83 f8 25 cmp $0x25,%eax
4bb: 0f 84 07 01 00 00 je 5c8 <printf+0x178>
4c1: 83 e8 63 sub $0x63,%eax
4c4: 83 f8 15 cmp $0x15,%eax
4c7: 77 17 ja 4e0 <printf+0x90>
4c9: ff 24 85 ac 07 00 00 jmp *0x7ac(,%eax,4)
putc(fd, c);
}
state = 0;
}
}
}
4d0: 8d 65 f4 lea -0xc(%ebp),%esp
4d3: 5b pop %ebx
4d4: 5e pop %esi
4d5: 5f pop %edi
4d6: 5d pop %ebp
4d7: c3 ret
4d8: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
4df: 90 nop
write(fd, &c, 1);
4e0: 83 ec 04 sub $0x4,%esp
4e3: 88 55 d4 mov %dl,-0x2c(%ebp)
4e6: 6a 01 push $0x1
4e8: 57 push %edi
4e9: 56 push %esi
4ea: c6 45 e7 25 movb $0x25,-0x19(%ebp)
4ee: e8 50 fe ff ff call 343 <write>
putc(fd, c);
4f3: 0f b6 55 d4 movzbl -0x2c(%ebp),%edx
write(fd, &c, 1);
4f7: 83 c4 0c add $0xc,%esp
4fa: 88 55 e7 mov %dl,-0x19(%ebp)
4fd: 6a 01 push $0x1
4ff: 57 push %edi
500: 56 push %esi
501: e8 3d fe ff ff call 343 <write>
putc(fd, c);
506: 83 c4 10 add $0x10,%esp
state = 0;
509: 31 c9 xor %ecx,%ecx
50b: eb 95 jmp 4a2 <printf+0x52>
50d: 8d 76 00 lea 0x0(%esi),%esi
printint(fd, *ap, 16, 0);
510: 83 ec 0c sub $0xc,%esp
513: b9 10 00 00 00 mov $0x10,%ecx
518: 6a 00 push $0x0
51a: 8b 45 d0 mov -0x30(%ebp),%eax
51d: 8b 10 mov (%eax),%edx
51f: 89 f0 mov %esi,%eax
521: e8 7a fe ff ff call 3a0 <printint>
ap++;
526: 83 45 d0 04 addl $0x4,-0x30(%ebp)
52a: 83 c4 10 add $0x10,%esp
state = 0;
52d: 31 c9 xor %ecx,%ecx
52f: e9 6e ff ff ff jmp 4a2 <printf+0x52>
534: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
s = (char*)*ap;
538: 8b 45 d0 mov -0x30(%ebp),%eax
53b: 8b 10 mov (%eax),%edx
ap++;
53d: 83 c0 04 add $0x4,%eax
540: 89 45 d0 mov %eax,-0x30(%ebp)
if (s == 0) {
543: 85 d2 test %edx,%edx
545: 0f 84 8d 00 00 00 je 5d8 <printf+0x188>
while (*s != 0) {
54b: 0f b6 02 movzbl (%edx),%eax
state = 0;
54e: 31 c9 xor %ecx,%ecx
while (*s != 0) {
550: 84 c0 test %al,%al
552: 0f 84 4a ff ff ff je 4a2 <printf+0x52>
558: 89 5d d4 mov %ebx,-0x2c(%ebp)
55b: 89 d3 mov %edx,%ebx
55d: 8d 76 00 lea 0x0(%esi),%esi
write(fd, &c, 1);
560: 83 ec 04 sub $0x4,%esp
s++;
563: 83 c3 01 add $0x1,%ebx
566: 88 45 e7 mov %al,-0x19(%ebp)
write(fd, &c, 1);
569: 6a 01 push $0x1
56b: 57 push %edi
56c: 56 push %esi
56d: e8 d1 fd ff ff call 343 <write>
while (*s != 0) {
572: 0f b6 03 movzbl (%ebx),%eax
575: 83 c4 10 add $0x10,%esp
578: 84 c0 test %al,%al
57a: 75 e4 jne 560 <printf+0x110>
state = 0;
57c: 8b 5d d4 mov -0x2c(%ebp),%ebx
57f: 31 c9 xor %ecx,%ecx
581: e9 1c ff ff ff jmp 4a2 <printf+0x52>
586: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
58d: 8d 76 00 lea 0x0(%esi),%esi
printint(fd, *ap, 10, 1);
590: 83 ec 0c sub $0xc,%esp
593: b9 0a 00 00 00 mov $0xa,%ecx
598: 6a 01 push $0x1
59a: e9 7b ff ff ff jmp 51a <printf+0xca>
59f: 90 nop
putc(fd, *ap);
5a0: 8b 45 d0 mov -0x30(%ebp),%eax
write(fd, &c, 1);
5a3: 83 ec 04 sub $0x4,%esp
putc(fd, *ap);
5a6: 8b 00 mov (%eax),%eax
write(fd, &c, 1);
5a8: 6a 01 push $0x1
5aa: 57 push %edi
5ab: 56 push %esi
putc(fd, *ap);
5ac: 88 45 e7 mov %al,-0x19(%ebp)
write(fd, &c, 1);
5af: e8 8f fd ff ff call 343 <write>
ap++;
5b4: 83 45 d0 04 addl $0x4,-0x30(%ebp)
5b8: 83 c4 10 add $0x10,%esp
state = 0;
5bb: 31 c9 xor %ecx,%ecx
5bd: e9 e0 fe ff ff jmp 4a2 <printf+0x52>
5c2: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
putc(fd, c);
5c8: 88 55 e7 mov %dl,-0x19(%ebp)
write(fd, &c, 1);
5cb: 83 ec 04 sub $0x4,%esp
5ce: e9 2a ff ff ff jmp 4fd <printf+0xad>
5d3: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
5d7: 90 nop
s = "(null)";
5d8: ba a5 07 00 00 mov $0x7a5,%edx
while (*s != 0) {
5dd: 89 5d d4 mov %ebx,-0x2c(%ebp)
5e0: b8 28 00 00 00 mov $0x28,%eax
5e5: 89 d3 mov %edx,%ebx
5e7: e9 74 ff ff ff jmp 560 <printf+0x110>
5ec: 66 90 xchg %ax,%ax
5ee: 66 90 xchg %ax,%ax
000005f0 <free>:
typedef union header Header;
static Header base;
static Header *freep;
void free(void *ap) {
5f0: 55 push %ebp
Header *bp, *p;
bp = (Header*)ap - 1;
for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
5f1: a1 bc 0a 00 00 mov 0xabc,%eax
void free(void *ap) {
5f6: 89 e5 mov %esp,%ebp
5f8: 57 push %edi
5f9: 56 push %esi
5fa: 53 push %ebx
5fb: 8b 5d 08 mov 0x8(%ebp),%ebx
bp = (Header*)ap - 1;
5fe: 8d 4b f8 lea -0x8(%ebx),%ecx
for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
601: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
608: 89 c2 mov %eax,%edx
60a: 8b 00 mov (%eax),%eax
60c: 39 ca cmp %ecx,%edx
60e: 73 30 jae 640 <free+0x50>
610: 39 c1 cmp %eax,%ecx
612: 72 04 jb 618 <free+0x28>
if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
614: 39 c2 cmp %eax,%edx
616: 72 f0 jb 608 <free+0x18>
break;
}
}
if (bp + bp->s.size == p->s.ptr) {
618: 8b 73 fc mov -0x4(%ebx),%esi
61b: 8d 3c f1 lea (%ecx,%esi,8),%edi
61e: 39 f8 cmp %edi,%eax
620: 74 30 je 652 <free+0x62>
bp->s.size += p->s.ptr->s.size;
bp->s.ptr = p->s.ptr->s.ptr;
622: 89 43 f8 mov %eax,-0x8(%ebx)
}
else {
bp->s.ptr = p->s.ptr;
}
if (p + p->s.size == bp) {
625: 8b 42 04 mov 0x4(%edx),%eax
628: 8d 34 c2 lea (%edx,%eax,8),%esi
62b: 39 f1 cmp %esi,%ecx
62d: 74 3a je 669 <free+0x79>
p->s.size += bp->s.size;
p->s.ptr = bp->s.ptr;
62f: 89 0a mov %ecx,(%edx)
}
else {
p->s.ptr = bp;
}
freep = p;
}
631: 5b pop %ebx
freep = p;
632: 89 15 bc 0a 00 00 mov %edx,0xabc
}
638: 5e pop %esi
639: 5f pop %edi
63a: 5d pop %ebp
63b: c3 ret
63c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi
if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
640: 39 c2 cmp %eax,%edx
642: 72 c4 jb 608 <free+0x18>
644: 39 c1 cmp %eax,%ecx
646: 73 c0 jae 608 <free+0x18>
if (bp + bp->s.size == p->s.ptr) {
648: 8b 73 fc mov -0x4(%ebx),%esi
64b: 8d 3c f1 lea (%ecx,%esi,8),%edi
64e: 39 f8 cmp %edi,%eax
650: 75 d0 jne 622 <free+0x32>
bp->s.size += p->s.ptr->s.size;
652: 03 70 04 add 0x4(%eax),%esi
655: 89 73 fc mov %esi,-0x4(%ebx)
bp->s.ptr = p->s.ptr->s.ptr;
658: 8b 02 mov (%edx),%eax
65a: 8b 00 mov (%eax),%eax
65c: 89 43 f8 mov %eax,-0x8(%ebx)
if (p + p->s.size == bp) {
65f: 8b 42 04 mov 0x4(%edx),%eax
662: 8d 34 c2 lea (%edx,%eax,8),%esi
665: 39 f1 cmp %esi,%ecx
667: 75 c6 jne 62f <free+0x3f>
p->s.size += bp->s.size;
669: 03 43 fc add -0x4(%ebx),%eax
freep = p;
66c: 89 15 bc 0a 00 00 mov %edx,0xabc
p->s.size += bp->s.size;
672: 89 42 04 mov %eax,0x4(%edx)
p->s.ptr = bp->s.ptr;
675: 8b 4b f8 mov -0x8(%ebx),%ecx
678: 89 0a mov %ecx,(%edx)
}
67a: 5b pop %ebx
67b: 5e pop %esi
67c: 5f pop %edi
67d: 5d pop %ebp
67e: c3 ret
67f: 90 nop
00000680 <malloc>:
hp->s.size = nu;
free((void*)(hp + 1));
return freep;
}
void* malloc(uint nbytes) {
680: 55 push %ebp
681: 89 e5 mov %esp,%ebp
683: 57 push %edi
684: 56 push %esi
685: 53 push %ebx
686: 83 ec 1c sub $0x1c,%esp
Header *p, *prevp;
uint nunits;
nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
689: 8b 45 08 mov 0x8(%ebp),%eax
if ((prevp = freep) == 0) {
68c: 8b 3d bc 0a 00 00 mov 0xabc,%edi
nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
692: 8d 70 07 lea 0x7(%eax),%esi
695: c1 ee 03 shr $0x3,%esi
698: 83 c6 01 add $0x1,%esi
if ((prevp = freep) == 0) {
69b: 85 ff test %edi,%edi
69d: 0f 84 9d 00 00 00 je 740 <malloc+0xc0>
base.s.ptr = freep = prevp = &base;
base.s.size = 0;
}
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
6a3: 8b 17 mov (%edi),%edx
if (p->s.size >= nunits) {
6a5: 8b 4a 04 mov 0x4(%edx),%ecx
6a8: 39 f1 cmp %esi,%ecx
6aa: 73 6a jae 716 <malloc+0x96>
6ac: bb 00 10 00 00 mov $0x1000,%ebx
6b1: 39 de cmp %ebx,%esi
6b3: 0f 43 de cmovae %esi,%ebx
p = sbrk(nu * sizeof(Header));
6b6: 8d 04 dd 00 00 00 00 lea 0x0(,%ebx,8),%eax
6bd: 89 45 e4 mov %eax,-0x1c(%ebp)
6c0: eb 17 jmp 6d9 <malloc+0x59>
6c2: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
6c8: 8b 02 mov (%edx),%eax
if (p->s.size >= nunits) {
6ca: 8b 48 04 mov 0x4(%eax),%ecx
6cd: 39 f1 cmp %esi,%ecx
6cf: 73 4f jae 720 <malloc+0xa0>
p->s.size = nunits;
}
freep = prevp;
return (void*)(p + 1);
}
if (p == freep) {
6d1: 8b 3d bc 0a 00 00 mov 0xabc,%edi
6d7: 89 c2 mov %eax,%edx
6d9: 39 d7 cmp %edx,%edi
6db: 75 eb jne 6c8 <malloc+0x48>
p = sbrk(nu * sizeof(Header));
6dd: 83 ec 0c sub $0xc,%esp
6e0: ff 75 e4 push -0x1c(%ebp)
6e3: e8 3b fc ff ff call 323 <sbrk>
if (p == (char*)-1) {
6e8: 83 c4 10 add $0x10,%esp
6eb: 83 f8 ff cmp $0xffffffff,%eax
6ee: 74 1c je 70c <malloc+0x8c>
hp->s.size = nu;
6f0: 89 58 04 mov %ebx,0x4(%eax)
free((void*)(hp + 1));
6f3: 83 ec 0c sub $0xc,%esp
6f6: 83 c0 08 add $0x8,%eax
6f9: 50 push %eax
6fa: e8 f1 fe ff ff call 5f0 <free>
return freep;
6ff: 8b 15 bc 0a 00 00 mov 0xabc,%edx
if ((p = morecore(nunits)) == 0) {
705: 83 c4 10 add $0x10,%esp
708: 85 d2 test %edx,%edx
70a: 75 bc jne 6c8 <malloc+0x48>
return 0;
}
}
}
}
70c: 8d 65 f4 lea -0xc(%ebp),%esp
return 0;
70f: 31 c0 xor %eax,%eax
}
711: 5b pop %ebx
712: 5e pop %esi
713: 5f pop %edi
714: 5d pop %ebp
715: c3 ret
if (p->s.size >= nunits) {
716: 89 d0 mov %edx,%eax
718: 89 fa mov %edi,%edx
71a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
if (p->s.size == nunits) {
720: 39 ce cmp %ecx,%esi
722: 74 4c je 770 <malloc+0xf0>
p->s.size -= nunits;
724: 29 f1 sub %esi,%ecx
726: 89 48 04 mov %ecx,0x4(%eax)
p += p->s.size;
729: 8d 04 c8 lea (%eax,%ecx,8),%eax
p->s.size = nunits;
72c: 89 70 04 mov %esi,0x4(%eax)
freep = prevp;
72f: 89 15 bc 0a 00 00 mov %edx,0xabc
}
735: 8d 65 f4 lea -0xc(%ebp),%esp
return (void*)(p + 1);
738: 83 c0 08 add $0x8,%eax
}
73b: 5b pop %ebx
73c: 5e pop %esi
73d: 5f pop %edi
73e: 5d pop %ebp
73f: c3 ret
base.s.ptr = freep = prevp = &base;
740: c7 05 bc 0a 00 00 c0 movl $0xac0,0xabc
747: 0a 00 00
base.s.size = 0;
74a: bf c0 0a 00 00 mov $0xac0,%edi
base.s.ptr = freep = prevp = &base;
74f: c7 05 c0 0a 00 00 c0 movl $0xac0,0xac0
756: 0a 00 00
for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
759: 89 fa mov %edi,%edx
base.s.size = 0;
75b: c7 05 c4 0a 00 00 00 movl $0x0,0xac4
762: 00 00 00
if (p->s.size >= nunits) {
765: e9 42 ff ff ff jmp 6ac <malloc+0x2c>
76a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
prevp->s.ptr = p->s.ptr;
770: 8b 08 mov (%eax),%ecx
772: 89 0a mov %ecx,(%edx)
774: eb b9 jmp 72f <malloc+0xaf>