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fun.asm
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_fun: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
#include "types.h"
#include "stat.h"
#include "user.h"
#include "fs.h"
int main ()
{
0: 8d 4c 24 04 lea 0x4(%esp),%ecx
4: 83 e4 f0 and $0xfffffff0,%esp
7: ff 71 fc pushl -0x4(%ecx)
a: 55 push %ebp
b: 89 e5 mov %esp,%ebp
d: 51 push %ecx
e: 83 ec 04 sub $0x4,%esp
printf(2, "~~HELLO~~");
11: 83 ec 08 sub $0x8,%esp
14: 68 bc 07 00 00 push $0x7bc
19: 6a 02 push $0x2
1b: e8 e6 03 00 00 call 406 <printf>
20: 83 c4 10 add $0x10,%esp
return 0;
23: b8 00 00 00 00 mov $0x0,%eax
}
28: 8b 4d fc mov -0x4(%ebp),%ecx
2b: c9 leave
2c: 8d 61 fc lea -0x4(%ecx),%esp
2f: c3 ret
00000030 <stosb>:
"cc");
}
static inline void
stosb(void *addr, int data, int cnt)
{
30: 55 push %ebp
31: 89 e5 mov %esp,%ebp
33: 57 push %edi
34: 53 push %ebx
asm volatile("cld; rep stosb" :
35: 8b 4d 08 mov 0x8(%ebp),%ecx
38: 8b 55 10 mov 0x10(%ebp),%edx
3b: 8b 45 0c mov 0xc(%ebp),%eax
3e: 89 cb mov %ecx,%ebx
40: 89 df mov %ebx,%edi
42: 89 d1 mov %edx,%ecx
44: fc cld
45: f3 aa rep stos %al,%es:(%edi)
47: 89 ca mov %ecx,%edx
49: 89 fb mov %edi,%ebx
4b: 89 5d 08 mov %ebx,0x8(%ebp)
4e: 89 55 10 mov %edx,0x10(%ebp)
"=D" (addr), "=c" (cnt) :
"0" (addr), "1" (cnt), "a" (data) :
"memory", "cc");
}
51: 90 nop
52: 5b pop %ebx
53: 5f pop %edi
54: 5d pop %ebp
55: c3 ret
00000056 <strcpy>:
#include "user.h"
#include "x86.h"
char*
strcpy(char *s, char *t)
{
56: 55 push %ebp
57: 89 e5 mov %esp,%ebp
59: 83 ec 10 sub $0x10,%esp
char *os;
os = s;
5c: 8b 45 08 mov 0x8(%ebp),%eax
5f: 89 45 fc mov %eax,-0x4(%ebp)
while((*s++ = *t++) != 0)
62: 90 nop
63: 8b 45 08 mov 0x8(%ebp),%eax
66: 8d 50 01 lea 0x1(%eax),%edx
69: 89 55 08 mov %edx,0x8(%ebp)
6c: 8b 55 0c mov 0xc(%ebp),%edx
6f: 8d 4a 01 lea 0x1(%edx),%ecx
72: 89 4d 0c mov %ecx,0xc(%ebp)
75: 0f b6 12 movzbl (%edx),%edx
78: 88 10 mov %dl,(%eax)
7a: 0f b6 00 movzbl (%eax),%eax
7d: 84 c0 test %al,%al
7f: 75 e2 jne 63 <strcpy+0xd>
;
return os;
81: 8b 45 fc mov -0x4(%ebp),%eax
}
84: c9 leave
85: c3 ret
00000086 <strcmp>:
int
strcmp(const char *p, const char *q)
{
86: 55 push %ebp
87: 89 e5 mov %esp,%ebp
while(*p && *p == *q)
89: eb 08 jmp 93 <strcmp+0xd>
p++, q++;
8b: 83 45 08 01 addl $0x1,0x8(%ebp)
8f: 83 45 0c 01 addl $0x1,0xc(%ebp)
}
int
strcmp(const char *p, const char *q)
{
while(*p && *p == *q)
93: 8b 45 08 mov 0x8(%ebp),%eax
96: 0f b6 00 movzbl (%eax),%eax
99: 84 c0 test %al,%al
9b: 74 10 je ad <strcmp+0x27>
9d: 8b 45 08 mov 0x8(%ebp),%eax
a0: 0f b6 10 movzbl (%eax),%edx
a3: 8b 45 0c mov 0xc(%ebp),%eax
a6: 0f b6 00 movzbl (%eax),%eax
a9: 38 c2 cmp %al,%dl
ab: 74 de je 8b <strcmp+0x5>
p++, q++;
return (uchar)*p - (uchar)*q;
ad: 8b 45 08 mov 0x8(%ebp),%eax
b0: 0f b6 00 movzbl (%eax),%eax
b3: 0f b6 d0 movzbl %al,%edx
b6: 8b 45 0c mov 0xc(%ebp),%eax
b9: 0f b6 00 movzbl (%eax),%eax
bc: 0f b6 c0 movzbl %al,%eax
bf: 29 c2 sub %eax,%edx
c1: 89 d0 mov %edx,%eax
}
c3: 5d pop %ebp
c4: c3 ret
000000c5 <strlen>:
uint
strlen(char *s)
{
c5: 55 push %ebp
c6: 89 e5 mov %esp,%ebp
c8: 83 ec 10 sub $0x10,%esp
int n;
for(n = 0; s[n]; n++)
cb: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
d2: eb 04 jmp d8 <strlen+0x13>
d4: 83 45 fc 01 addl $0x1,-0x4(%ebp)
d8: 8b 55 fc mov -0x4(%ebp),%edx
db: 8b 45 08 mov 0x8(%ebp),%eax
de: 01 d0 add %edx,%eax
e0: 0f b6 00 movzbl (%eax),%eax
e3: 84 c0 test %al,%al
e5: 75 ed jne d4 <strlen+0xf>
;
return n;
e7: 8b 45 fc mov -0x4(%ebp),%eax
}
ea: c9 leave
eb: c3 ret
000000ec <memset>:
void*
memset(void *dst, int c, uint n)
{
ec: 55 push %ebp
ed: 89 e5 mov %esp,%ebp
stosb(dst, c, n);
ef: 8b 45 10 mov 0x10(%ebp),%eax
f2: 50 push %eax
f3: ff 75 0c pushl 0xc(%ebp)
f6: ff 75 08 pushl 0x8(%ebp)
f9: e8 32 ff ff ff call 30 <stosb>
fe: 83 c4 0c add $0xc,%esp
return dst;
101: 8b 45 08 mov 0x8(%ebp),%eax
}
104: c9 leave
105: c3 ret
00000106 <strchr>:
char*
strchr(const char *s, char c)
{
106: 55 push %ebp
107: 89 e5 mov %esp,%ebp
109: 83 ec 04 sub $0x4,%esp
10c: 8b 45 0c mov 0xc(%ebp),%eax
10f: 88 45 fc mov %al,-0x4(%ebp)
for(; *s; s++)
112: eb 14 jmp 128 <strchr+0x22>
if(*s == c)
114: 8b 45 08 mov 0x8(%ebp),%eax
117: 0f b6 00 movzbl (%eax),%eax
11a: 3a 45 fc cmp -0x4(%ebp),%al
11d: 75 05 jne 124 <strchr+0x1e>
return (char*)s;
11f: 8b 45 08 mov 0x8(%ebp),%eax
122: eb 13 jmp 137 <strchr+0x31>
}
char*
strchr(const char *s, char c)
{
for(; *s; s++)
124: 83 45 08 01 addl $0x1,0x8(%ebp)
128: 8b 45 08 mov 0x8(%ebp),%eax
12b: 0f b6 00 movzbl (%eax),%eax
12e: 84 c0 test %al,%al
130: 75 e2 jne 114 <strchr+0xe>
if(*s == c)
return (char*)s;
return 0;
132: b8 00 00 00 00 mov $0x0,%eax
}
137: c9 leave
138: c3 ret
00000139 <gets>:
char*
gets(char *buf, int max)
{
139: 55 push %ebp
13a: 89 e5 mov %esp,%ebp
13c: 83 ec 18 sub $0x18,%esp
int i, cc;
char c;
for(i=0; i+1 < max; ){
13f: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
146: eb 42 jmp 18a <gets+0x51>
cc = read(0, &c, 1);
148: 83 ec 04 sub $0x4,%esp
14b: 6a 01 push $0x1
14d: 8d 45 ef lea -0x11(%ebp),%eax
150: 50 push %eax
151: 6a 00 push $0x0
153: e8 47 01 00 00 call 29f <read>
158: 83 c4 10 add $0x10,%esp
15b: 89 45 f0 mov %eax,-0x10(%ebp)
if(cc < 1)
15e: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
162: 7e 33 jle 197 <gets+0x5e>
break;
buf[i++] = c;
164: 8b 45 f4 mov -0xc(%ebp),%eax
167: 8d 50 01 lea 0x1(%eax),%edx
16a: 89 55 f4 mov %edx,-0xc(%ebp)
16d: 89 c2 mov %eax,%edx
16f: 8b 45 08 mov 0x8(%ebp),%eax
172: 01 c2 add %eax,%edx
174: 0f b6 45 ef movzbl -0x11(%ebp),%eax
178: 88 02 mov %al,(%edx)
if(c == '\n' || c == '\r')
17a: 0f b6 45 ef movzbl -0x11(%ebp),%eax
17e: 3c 0a cmp $0xa,%al
180: 74 16 je 198 <gets+0x5f>
182: 0f b6 45 ef movzbl -0x11(%ebp),%eax
186: 3c 0d cmp $0xd,%al
188: 74 0e je 198 <gets+0x5f>
gets(char *buf, int max)
{
int i, cc;
char c;
for(i=0; i+1 < max; ){
18a: 8b 45 f4 mov -0xc(%ebp),%eax
18d: 83 c0 01 add $0x1,%eax
190: 3b 45 0c cmp 0xc(%ebp),%eax
193: 7c b3 jl 148 <gets+0xf>
195: eb 01 jmp 198 <gets+0x5f>
cc = read(0, &c, 1);
if(cc < 1)
break;
197: 90 nop
buf[i++] = c;
if(c == '\n' || c == '\r')
break;
}
buf[i] = '\0';
198: 8b 55 f4 mov -0xc(%ebp),%edx
19b: 8b 45 08 mov 0x8(%ebp),%eax
19e: 01 d0 add %edx,%eax
1a0: c6 00 00 movb $0x0,(%eax)
return buf;
1a3: 8b 45 08 mov 0x8(%ebp),%eax
}
1a6: c9 leave
1a7: c3 ret
000001a8 <stat>:
int
stat(char *n, struct stat *st)
{
1a8: 55 push %ebp
1a9: 89 e5 mov %esp,%ebp
1ab: 83 ec 18 sub $0x18,%esp
int fd;
int r;
fd = open(n, O_RDONLY);
1ae: 83 ec 08 sub $0x8,%esp
1b1: 6a 00 push $0x0
1b3: ff 75 08 pushl 0x8(%ebp)
1b6: e8 0c 01 00 00 call 2c7 <open>
1bb: 83 c4 10 add $0x10,%esp
1be: 89 45 f4 mov %eax,-0xc(%ebp)
if(fd < 0)
1c1: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
1c5: 79 07 jns 1ce <stat+0x26>
return -1;
1c7: b8 ff ff ff ff mov $0xffffffff,%eax
1cc: eb 25 jmp 1f3 <stat+0x4b>
r = fstat(fd, st);
1ce: 83 ec 08 sub $0x8,%esp
1d1: ff 75 0c pushl 0xc(%ebp)
1d4: ff 75 f4 pushl -0xc(%ebp)
1d7: e8 03 01 00 00 call 2df <fstat>
1dc: 83 c4 10 add $0x10,%esp
1df: 89 45 f0 mov %eax,-0x10(%ebp)
close(fd);
1e2: 83 ec 0c sub $0xc,%esp
1e5: ff 75 f4 pushl -0xc(%ebp)
1e8: e8 c2 00 00 00 call 2af <close>
1ed: 83 c4 10 add $0x10,%esp
return r;
1f0: 8b 45 f0 mov -0x10(%ebp),%eax
}
1f3: c9 leave
1f4: c3 ret
000001f5 <atoi>:
int
atoi(const char *s)
{
1f5: 55 push %ebp
1f6: 89 e5 mov %esp,%ebp
1f8: 83 ec 10 sub $0x10,%esp
int n;
n = 0;
1fb: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
while('0' <= *s && *s <= '9')
202: eb 25 jmp 229 <atoi+0x34>
n = n*10 + *s++ - '0';
204: 8b 55 fc mov -0x4(%ebp),%edx
207: 89 d0 mov %edx,%eax
209: c1 e0 02 shl $0x2,%eax
20c: 01 d0 add %edx,%eax
20e: 01 c0 add %eax,%eax
210: 89 c1 mov %eax,%ecx
212: 8b 45 08 mov 0x8(%ebp),%eax
215: 8d 50 01 lea 0x1(%eax),%edx
218: 89 55 08 mov %edx,0x8(%ebp)
21b: 0f b6 00 movzbl (%eax),%eax
21e: 0f be c0 movsbl %al,%eax
221: 01 c8 add %ecx,%eax
223: 83 e8 30 sub $0x30,%eax
226: 89 45 fc mov %eax,-0x4(%ebp)
atoi(const char *s)
{
int n;
n = 0;
while('0' <= *s && *s <= '9')
229: 8b 45 08 mov 0x8(%ebp),%eax
22c: 0f b6 00 movzbl (%eax),%eax
22f: 3c 2f cmp $0x2f,%al
231: 7e 0a jle 23d <atoi+0x48>
233: 8b 45 08 mov 0x8(%ebp),%eax
236: 0f b6 00 movzbl (%eax),%eax
239: 3c 39 cmp $0x39,%al
23b: 7e c7 jle 204 <atoi+0xf>
n = n*10 + *s++ - '0';
return n;
23d: 8b 45 fc mov -0x4(%ebp),%eax
}
240: c9 leave
241: c3 ret
00000242 <memmove>:
void*
memmove(void *vdst, void *vsrc, int n)
{
242: 55 push %ebp
243: 89 e5 mov %esp,%ebp
245: 83 ec 10 sub $0x10,%esp
char *dst, *src;
dst = vdst;
248: 8b 45 08 mov 0x8(%ebp),%eax
24b: 89 45 fc mov %eax,-0x4(%ebp)
src = vsrc;
24e: 8b 45 0c mov 0xc(%ebp),%eax
251: 89 45 f8 mov %eax,-0x8(%ebp)
while(n-- > 0)
254: eb 17 jmp 26d <memmove+0x2b>
*dst++ = *src++;
256: 8b 45 fc mov -0x4(%ebp),%eax
259: 8d 50 01 lea 0x1(%eax),%edx
25c: 89 55 fc mov %edx,-0x4(%ebp)
25f: 8b 55 f8 mov -0x8(%ebp),%edx
262: 8d 4a 01 lea 0x1(%edx),%ecx
265: 89 4d f8 mov %ecx,-0x8(%ebp)
268: 0f b6 12 movzbl (%edx),%edx
26b: 88 10 mov %dl,(%eax)
{
char *dst, *src;
dst = vdst;
src = vsrc;
while(n-- > 0)
26d: 8b 45 10 mov 0x10(%ebp),%eax
270: 8d 50 ff lea -0x1(%eax),%edx
273: 89 55 10 mov %edx,0x10(%ebp)
276: 85 c0 test %eax,%eax
278: 7f dc jg 256 <memmove+0x14>
*dst++ = *src++;
return vdst;
27a: 8b 45 08 mov 0x8(%ebp),%eax
}
27d: c9 leave
27e: c3 ret
0000027f <fork>:
name: \
movl $SYS_ ## name, %eax; \
int $T_SYSCALL; \
ret
SYSCALL(fork)
27f: b8 01 00 00 00 mov $0x1,%eax
284: cd 40 int $0x40
286: c3 ret
00000287 <exit>:
SYSCALL(exit)
287: b8 02 00 00 00 mov $0x2,%eax
28c: cd 40 int $0x40
28e: c3 ret
0000028f <wait>:
SYSCALL(wait)
28f: b8 03 00 00 00 mov $0x3,%eax
294: cd 40 int $0x40
296: c3 ret
00000297 <pipe>:
SYSCALL(pipe)
297: b8 04 00 00 00 mov $0x4,%eax
29c: cd 40 int $0x40
29e: c3 ret
0000029f <read>:
SYSCALL(read)
29f: b8 05 00 00 00 mov $0x5,%eax
2a4: cd 40 int $0x40
2a6: c3 ret
000002a7 <write>:
SYSCALL(write)
2a7: b8 10 00 00 00 mov $0x10,%eax
2ac: cd 40 int $0x40
2ae: c3 ret
000002af <close>:
SYSCALL(close)
2af: b8 15 00 00 00 mov $0x15,%eax
2b4: cd 40 int $0x40
2b6: c3 ret
000002b7 <kill>:
SYSCALL(kill)
2b7: b8 06 00 00 00 mov $0x6,%eax
2bc: cd 40 int $0x40
2be: c3 ret
000002bf <exec>:
SYSCALL(exec)
2bf: b8 07 00 00 00 mov $0x7,%eax
2c4: cd 40 int $0x40
2c6: c3 ret
000002c7 <open>:
SYSCALL(open)
2c7: b8 0f 00 00 00 mov $0xf,%eax
2cc: cd 40 int $0x40
2ce: c3 ret
000002cf <mknod>:
SYSCALL(mknod)
2cf: b8 11 00 00 00 mov $0x11,%eax
2d4: cd 40 int $0x40
2d6: c3 ret
000002d7 <unlink>:
SYSCALL(unlink)
2d7: b8 12 00 00 00 mov $0x12,%eax
2dc: cd 40 int $0x40
2de: c3 ret
000002df <fstat>:
SYSCALL(fstat)
2df: b8 08 00 00 00 mov $0x8,%eax
2e4: cd 40 int $0x40
2e6: c3 ret
000002e7 <link>:
SYSCALL(link)
2e7: b8 13 00 00 00 mov $0x13,%eax
2ec: cd 40 int $0x40
2ee: c3 ret
000002ef <mkdir>:
SYSCALL(mkdir)
2ef: b8 14 00 00 00 mov $0x14,%eax
2f4: cd 40 int $0x40
2f6: c3 ret
000002f7 <chdir>:
SYSCALL(chdir)
2f7: b8 09 00 00 00 mov $0x9,%eax
2fc: cd 40 int $0x40
2fe: c3 ret
000002ff <dup>:
SYSCALL(dup)
2ff: b8 0a 00 00 00 mov $0xa,%eax
304: cd 40 int $0x40
306: c3 ret
00000307 <getpid>:
SYSCALL(getpid)
307: b8 0b 00 00 00 mov $0xb,%eax
30c: cd 40 int $0x40
30e: c3 ret
0000030f <sbrk>:
SYSCALL(sbrk)
30f: b8 0c 00 00 00 mov $0xc,%eax
314: cd 40 int $0x40
316: c3 ret
00000317 <sleep>:
SYSCALL(sleep)
317: b8 0d 00 00 00 mov $0xd,%eax
31c: cd 40 int $0x40
31e: c3 ret
0000031f <uptime>:
SYSCALL(uptime)
31f: b8 0e 00 00 00 mov $0xe,%eax
324: cd 40 int $0x40
326: c3 ret
00000327 <fun>:
SYSCALL(fun)
327: b8 16 00 00 00 mov $0x16,%eax
32c: cd 40 int $0x40
32e: c3 ret
0000032f <putc>:
#include "stat.h"
#include "user.h"
static void
putc(int fd, char c)
{
32f: 55 push %ebp
330: 89 e5 mov %esp,%ebp
332: 83 ec 18 sub $0x18,%esp
335: 8b 45 0c mov 0xc(%ebp),%eax
338: 88 45 f4 mov %al,-0xc(%ebp)
write(fd, &c, 1);
33b: 83 ec 04 sub $0x4,%esp
33e: 6a 01 push $0x1
340: 8d 45 f4 lea -0xc(%ebp),%eax
343: 50 push %eax
344: ff 75 08 pushl 0x8(%ebp)
347: e8 5b ff ff ff call 2a7 <write>
34c: 83 c4 10 add $0x10,%esp
}
34f: 90 nop
350: c9 leave
351: c3 ret
00000352 <printint>:
static void
printint(int fd, int xx, int base, int sgn)
{
352: 55 push %ebp
353: 89 e5 mov %esp,%ebp
355: 53 push %ebx
356: 83 ec 24 sub $0x24,%esp
static char digits[] = "0123456789ABCDEF";
char buf[16];
int i, neg;
uint x;
neg = 0;
359: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
if(sgn && xx < 0){
360: 83 7d 14 00 cmpl $0x0,0x14(%ebp)
364: 74 17 je 37d <printint+0x2b>
366: 83 7d 0c 00 cmpl $0x0,0xc(%ebp)
36a: 79 11 jns 37d <printint+0x2b>
neg = 1;
36c: c7 45 f0 01 00 00 00 movl $0x1,-0x10(%ebp)
x = -xx;
373: 8b 45 0c mov 0xc(%ebp),%eax
376: f7 d8 neg %eax
378: 89 45 ec mov %eax,-0x14(%ebp)
37b: eb 06 jmp 383 <printint+0x31>
} else {
x = xx;
37d: 8b 45 0c mov 0xc(%ebp),%eax
380: 89 45 ec mov %eax,-0x14(%ebp)
}
i = 0;
383: c7 45 f4 00 00 00 00 movl $0x0,-0xc(%ebp)
do{
buf[i++] = digits[x % base];
38a: 8b 4d f4 mov -0xc(%ebp),%ecx
38d: 8d 41 01 lea 0x1(%ecx),%eax
390: 89 45 f4 mov %eax,-0xc(%ebp)
393: 8b 5d 10 mov 0x10(%ebp),%ebx
396: 8b 45 ec mov -0x14(%ebp),%eax
399: ba 00 00 00 00 mov $0x0,%edx
39e: f7 f3 div %ebx
3a0: 89 d0 mov %edx,%eax
3a2: 0f b6 80 20 0a 00 00 movzbl 0xa20(%eax),%eax
3a9: 88 44 0d dc mov %al,-0x24(%ebp,%ecx,1)
}while((x /= base) != 0);
3ad: 8b 5d 10 mov 0x10(%ebp),%ebx
3b0: 8b 45 ec mov -0x14(%ebp),%eax
3b3: ba 00 00 00 00 mov $0x0,%edx
3b8: f7 f3 div %ebx
3ba: 89 45 ec mov %eax,-0x14(%ebp)
3bd: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
3c1: 75 c7 jne 38a <printint+0x38>
if(neg)
3c3: 83 7d f0 00 cmpl $0x0,-0x10(%ebp)
3c7: 74 2d je 3f6 <printint+0xa4>
buf[i++] = '-';
3c9: 8b 45 f4 mov -0xc(%ebp),%eax
3cc: 8d 50 01 lea 0x1(%eax),%edx
3cf: 89 55 f4 mov %edx,-0xc(%ebp)
3d2: c6 44 05 dc 2d movb $0x2d,-0x24(%ebp,%eax,1)
while(--i >= 0)
3d7: eb 1d jmp 3f6 <printint+0xa4>
putc(fd, buf[i]);
3d9: 8d 55 dc lea -0x24(%ebp),%edx
3dc: 8b 45 f4 mov -0xc(%ebp),%eax
3df: 01 d0 add %edx,%eax
3e1: 0f b6 00 movzbl (%eax),%eax
3e4: 0f be c0 movsbl %al,%eax
3e7: 83 ec 08 sub $0x8,%esp
3ea: 50 push %eax
3eb: ff 75 08 pushl 0x8(%ebp)
3ee: e8 3c ff ff ff call 32f <putc>
3f3: 83 c4 10 add $0x10,%esp
buf[i++] = digits[x % base];
}while((x /= base) != 0);
if(neg)
buf[i++] = '-';
while(--i >= 0)
3f6: 83 6d f4 01 subl $0x1,-0xc(%ebp)
3fa: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
3fe: 79 d9 jns 3d9 <printint+0x87>
putc(fd, buf[i]);
}
400: 90 nop
401: 8b 5d fc mov -0x4(%ebp),%ebx
404: c9 leave
405: c3 ret
00000406 <printf>:
// Print to the given fd. Only understands %d, %x, %p, %s.
void
printf(int fd, char *fmt, ...)
{
406: 55 push %ebp
407: 89 e5 mov %esp,%ebp
409: 83 ec 28 sub $0x28,%esp
char *s;
int c, i, state;
uint *ap;
state = 0;
40c: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%ebp)
ap = (uint*)(void*)&fmt + 1;
413: 8d 45 0c lea 0xc(%ebp),%eax
416: 83 c0 04 add $0x4,%eax
419: 89 45 e8 mov %eax,-0x18(%ebp)
for(i = 0; fmt[i]; i++){
41c: c7 45 f0 00 00 00 00 movl $0x0,-0x10(%ebp)
423: e9 59 01 00 00 jmp 581 <printf+0x17b>
c = fmt[i] & 0xff;
428: 8b 55 0c mov 0xc(%ebp),%edx
42b: 8b 45 f0 mov -0x10(%ebp),%eax
42e: 01 d0 add %edx,%eax
430: 0f b6 00 movzbl (%eax),%eax
433: 0f be c0 movsbl %al,%eax
436: 25 ff 00 00 00 and $0xff,%eax
43b: 89 45 e4 mov %eax,-0x1c(%ebp)
if(state == 0){
43e: 83 7d ec 00 cmpl $0x0,-0x14(%ebp)
442: 75 2c jne 470 <printf+0x6a>
if(c == '%'){
444: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
448: 75 0c jne 456 <printf+0x50>
state = '%';
44a: c7 45 ec 25 00 00 00 movl $0x25,-0x14(%ebp)
451: e9 27 01 00 00 jmp 57d <printf+0x177>
} else {
putc(fd, c);
456: 8b 45 e4 mov -0x1c(%ebp),%eax
459: 0f be c0 movsbl %al,%eax
45c: 83 ec 08 sub $0x8,%esp
45f: 50 push %eax
460: ff 75 08 pushl 0x8(%ebp)
463: e8 c7 fe ff ff call 32f <putc>
468: 83 c4 10 add $0x10,%esp
46b: e9 0d 01 00 00 jmp 57d <printf+0x177>
}
} else if(state == '%'){
470: 83 7d ec 25 cmpl $0x25,-0x14(%ebp)
474: 0f 85 03 01 00 00 jne 57d <printf+0x177>
if(c == 'd'){
47a: 83 7d e4 64 cmpl $0x64,-0x1c(%ebp)
47e: 75 1e jne 49e <printf+0x98>
printint(fd, *ap, 10, 1);
480: 8b 45 e8 mov -0x18(%ebp),%eax
483: 8b 00 mov (%eax),%eax
485: 6a 01 push $0x1
487: 6a 0a push $0xa
489: 50 push %eax
48a: ff 75 08 pushl 0x8(%ebp)
48d: e8 c0 fe ff ff call 352 <printint>
492: 83 c4 10 add $0x10,%esp
ap++;
495: 83 45 e8 04 addl $0x4,-0x18(%ebp)
499: e9 d8 00 00 00 jmp 576 <printf+0x170>
} else if(c == 'x' || c == 'p'){
49e: 83 7d e4 78 cmpl $0x78,-0x1c(%ebp)
4a2: 74 06 je 4aa <printf+0xa4>
4a4: 83 7d e4 70 cmpl $0x70,-0x1c(%ebp)
4a8: 75 1e jne 4c8 <printf+0xc2>
printint(fd, *ap, 16, 0);
4aa: 8b 45 e8 mov -0x18(%ebp),%eax
4ad: 8b 00 mov (%eax),%eax
4af: 6a 00 push $0x0
4b1: 6a 10 push $0x10
4b3: 50 push %eax
4b4: ff 75 08 pushl 0x8(%ebp)
4b7: e8 96 fe ff ff call 352 <printint>
4bc: 83 c4 10 add $0x10,%esp
ap++;
4bf: 83 45 e8 04 addl $0x4,-0x18(%ebp)
4c3: e9 ae 00 00 00 jmp 576 <printf+0x170>
} else if(c == 's'){
4c8: 83 7d e4 73 cmpl $0x73,-0x1c(%ebp)
4cc: 75 43 jne 511 <printf+0x10b>
s = (char*)*ap;
4ce: 8b 45 e8 mov -0x18(%ebp),%eax
4d1: 8b 00 mov (%eax),%eax
4d3: 89 45 f4 mov %eax,-0xc(%ebp)
ap++;
4d6: 83 45 e8 04 addl $0x4,-0x18(%ebp)
if(s == 0)
4da: 83 7d f4 00 cmpl $0x0,-0xc(%ebp)
4de: 75 25 jne 505 <printf+0xff>
s = "(null)";
4e0: c7 45 f4 c6 07 00 00 movl $0x7c6,-0xc(%ebp)
while(*s != 0){
4e7: eb 1c jmp 505 <printf+0xff>
putc(fd, *s);
4e9: 8b 45 f4 mov -0xc(%ebp),%eax
4ec: 0f b6 00 movzbl (%eax),%eax
4ef: 0f be c0 movsbl %al,%eax
4f2: 83 ec 08 sub $0x8,%esp
4f5: 50 push %eax
4f6: ff 75 08 pushl 0x8(%ebp)
4f9: e8 31 fe ff ff call 32f <putc>
4fe: 83 c4 10 add $0x10,%esp
s++;
501: 83 45 f4 01 addl $0x1,-0xc(%ebp)
} else if(c == 's'){
s = (char*)*ap;
ap++;
if(s == 0)
s = "(null)";
while(*s != 0){
505: 8b 45 f4 mov -0xc(%ebp),%eax
508: 0f b6 00 movzbl (%eax),%eax
50b: 84 c0 test %al,%al
50d: 75 da jne 4e9 <printf+0xe3>
50f: eb 65 jmp 576 <printf+0x170>
putc(fd, *s);
s++;
}
} else if(c == 'c'){
511: 83 7d e4 63 cmpl $0x63,-0x1c(%ebp)
515: 75 1d jne 534 <printf+0x12e>
putc(fd, *ap);
517: 8b 45 e8 mov -0x18(%ebp),%eax
51a: 8b 00 mov (%eax),%eax
51c: 0f be c0 movsbl %al,%eax
51f: 83 ec 08 sub $0x8,%esp
522: 50 push %eax
523: ff 75 08 pushl 0x8(%ebp)
526: e8 04 fe ff ff call 32f <putc>
52b: 83 c4 10 add $0x10,%esp
ap++;
52e: 83 45 e8 04 addl $0x4,-0x18(%ebp)
532: eb 42 jmp 576 <printf+0x170>
} else if(c == '%'){
534: 83 7d e4 25 cmpl $0x25,-0x1c(%ebp)
538: 75 17 jne 551 <printf+0x14b>
putc(fd, c);
53a: 8b 45 e4 mov -0x1c(%ebp),%eax
53d: 0f be c0 movsbl %al,%eax
540: 83 ec 08 sub $0x8,%esp
543: 50 push %eax
544: ff 75 08 pushl 0x8(%ebp)
547: e8 e3 fd ff ff call 32f <putc>
54c: 83 c4 10 add $0x10,%esp
54f: eb 25 jmp 576 <printf+0x170>
} else {
// Unknown % sequence. Print it to draw attention.
putc(fd, '%');
551: 83 ec 08 sub $0x8,%esp
554: 6a 25 push $0x25
556: ff 75 08 pushl 0x8(%ebp)
559: e8 d1 fd ff ff call 32f <putc>
55e: 83 c4 10 add $0x10,%esp
putc(fd, c);
561: 8b 45 e4 mov -0x1c(%ebp),%eax
564: 0f be c0 movsbl %al,%eax
567: 83 ec 08 sub $0x8,%esp
56a: 50 push %eax
56b: ff 75 08 pushl 0x8(%ebp)
56e: e8 bc fd ff ff call 32f <putc>
573: 83 c4 10 add $0x10,%esp
}
state = 0;
576: 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++){
57d: 83 45 f0 01 addl $0x1,-0x10(%ebp)
581: 8b 55 0c mov 0xc(%ebp),%edx
584: 8b 45 f0 mov -0x10(%ebp),%eax
587: 01 d0 add %edx,%eax
589: 0f b6 00 movzbl (%eax),%eax
58c: 84 c0 test %al,%al
58e: 0f 85 94 fe ff ff jne 428 <printf+0x22>
putc(fd, c);
}
state = 0;
}
}
}
594: 90 nop
595: c9 leave
596: c3 ret
00000597 <free>:
static Header base;
static Header *freep;
void
free(void *ap)
{
597: 55 push %ebp
598: 89 e5 mov %esp,%ebp
59a: 83 ec 10 sub $0x10,%esp
Header *bp, *p;
bp = (Header*)ap - 1;
59d: 8b 45 08 mov 0x8(%ebp),%eax
5a0: 83 e8 08 sub $0x8,%eax
5a3: 89 45 f8 mov %eax,-0x8(%ebp)
for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
5a6: a1 3c 0a 00 00 mov 0xa3c,%eax
5ab: 89 45 fc mov %eax,-0x4(%ebp)
5ae: eb 24 jmp 5d4 <free+0x3d>
if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
5b0: 8b 45 fc mov -0x4(%ebp),%eax
5b3: 8b 00 mov (%eax),%eax
5b5: 3b 45 fc cmp -0x4(%ebp),%eax
5b8: 77 12 ja 5cc <free+0x35>
5ba: 8b 45 f8 mov -0x8(%ebp),%eax
5bd: 3b 45 fc cmp -0x4(%ebp),%eax
5c0: 77 24 ja 5e6 <free+0x4f>
5c2: 8b 45 fc mov -0x4(%ebp),%eax
5c5: 8b 00 mov (%eax),%eax
5c7: 3b 45 f8 cmp -0x8(%ebp),%eax
5ca: 77 1a ja 5e6 <free+0x4f>
free(void *ap)
{
Header *bp, *p;
bp = (Header*)ap - 1;
for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
5cc: 8b 45 fc mov -0x4(%ebp),%eax
5cf: 8b 00 mov (%eax),%eax
5d1: 89 45 fc mov %eax,-0x4(%ebp)
5d4: 8b 45 f8 mov -0x8(%ebp),%eax
5d7: 3b 45 fc cmp -0x4(%ebp),%eax
5da: 76 d4 jbe 5b0 <free+0x19>
5dc: 8b 45 fc mov -0x4(%ebp),%eax
5df: 8b 00 mov (%eax),%eax
5e1: 3b 45 f8 cmp -0x8(%ebp),%eax
5e4: 76 ca jbe 5b0 <free+0x19>
if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
break;
if(bp + bp->s.size == p->s.ptr){
5e6: 8b 45 f8 mov -0x8(%ebp),%eax
5e9: 8b 40 04 mov 0x4(%eax),%eax
5ec: 8d 14 c5 00 00 00 00 lea 0x0(,%eax,8),%edx
5f3: 8b 45 f8 mov -0x8(%ebp),%eax
5f6: 01 c2 add %eax,%edx
5f8: 8b 45 fc mov -0x4(%ebp),%eax
5fb: 8b 00 mov (%eax),%eax
5fd: 39 c2 cmp %eax,%edx
5ff: 75 24 jne 625 <free+0x8e>
bp->s.size += p->s.ptr->s.size;
601: 8b 45 f8 mov -0x8(%ebp),%eax
604: 8b 50 04 mov 0x4(%eax),%edx
607: 8b 45 fc mov -0x4(%ebp),%eax
60a: 8b 00 mov (%eax),%eax
60c: 8b 40 04 mov 0x4(%eax),%eax
60f: 01 c2 add %eax,%edx
611: 8b 45 f8 mov -0x8(%ebp),%eax
614: 89 50 04 mov %edx,0x4(%eax)
bp->s.ptr = p->s.ptr->s.ptr;
617: 8b 45 fc mov -0x4(%ebp),%eax
61a: 8b 00 mov (%eax),%eax
61c: 8b 10 mov (%eax),%edx
61e: 8b 45 f8 mov -0x8(%ebp),%eax
621: 89 10 mov %edx,(%eax)
623: eb 0a jmp 62f <free+0x98>
} else
bp->s.ptr = p->s.ptr;
625: 8b 45 fc mov -0x4(%ebp),%eax
628: 8b 10 mov (%eax),%edx
62a: 8b 45 f8 mov -0x8(%ebp),%eax
62d: 89 10 mov %edx,(%eax)
if(p + p->s.size == bp){
62f: 8b 45 fc mov -0x4(%ebp),%eax
632: 8b 40 04 mov 0x4(%eax),%eax
635: 8d 14 c5 00 00 00 00 lea 0x0(,%eax,8),%edx
63c: 8b 45 fc mov -0x4(%ebp),%eax
63f: 01 d0 add %edx,%eax
641: 3b 45 f8 cmp -0x8(%ebp),%eax
644: 75 20 jne 666 <free+0xcf>
p->s.size += bp->s.size;
646: 8b 45 fc mov -0x4(%ebp),%eax
649: 8b 50 04 mov 0x4(%eax),%edx
64c: 8b 45 f8 mov -0x8(%ebp),%eax
64f: 8b 40 04 mov 0x4(%eax),%eax
652: 01 c2 add %eax,%edx
654: 8b 45 fc mov -0x4(%ebp),%eax
657: 89 50 04 mov %edx,0x4(%eax)
p->s.ptr = bp->s.ptr;
65a: 8b 45 f8 mov -0x8(%ebp),%eax
65d: 8b 10 mov (%eax),%edx
65f: 8b 45 fc mov -0x4(%ebp),%eax
662: 89 10 mov %edx,(%eax)
664: eb 08 jmp 66e <free+0xd7>
} else
p->s.ptr = bp;
666: 8b 45 fc mov -0x4(%ebp),%eax