_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>