_grep:     file format elf32-i386


Disassembly of section .text:

00000000 <main>:
            memmove(buf, p, m);
        }
    }
}

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 59 04             	mov    0x4(%ecx),%ebx
  19:	89 45 e4             	mov    %eax,-0x1c(%ebp)
    int fd, i;
    char *pattern;

    if (argc <= 1) {
  1c:	83 f8 01             	cmp    $0x1,%eax
  1f:	7e 6f                	jle    90 <main+0x90>
        printf(2, "usage: grep pattern [file ...]\n");
        exit();
    }
    pattern = argv[1];
  21:	8b 43 04             	mov    0x4(%ebx),%eax
  24:	83 c3 08             	add    $0x8,%ebx

    if (argc <= 2) {
  27:	83 7d e4 02          	cmpl   $0x2,-0x1c(%ebp)
        grep(pattern, 0);
        exit();
    }

    for (i = 2; i < argc; i++) {
  2b:	be 02 00 00 00       	mov    $0x2,%esi
    pattern = argv[1];
  30:	89 45 e0             	mov    %eax,-0x20(%ebp)
    if (argc <= 2) {
  33:	75 2d                	jne    62 <main+0x62>
  35:	eb 6c                	jmp    a3 <main+0xa3>
  37:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
  3e:	66 90                	xchg   %ax,%ax
        if ((fd = open(argv[i], 0)) < 0) {
            printf(1, "grep: cannot open %s\n", argv[i]);
            exit();
        }
        grep(pattern, fd);
  40:	83 ec 08             	sub    $0x8,%esp
    for (i = 2; i < argc; i++) {
  43:	83 c6 01             	add    $0x1,%esi
  46:	83 c3 04             	add    $0x4,%ebx
        grep(pattern, fd);
  49:	50                   	push   %eax
  4a:	ff 75 e0             	push   -0x20(%ebp)
  4d:	e8 7e 01 00 00       	call   1d0 <grep>
        close(fd);
  52:	89 3c 24             	mov    %edi,(%esp)
  55:	e8 01 06 00 00       	call   65b <close>
    for (i = 2; i < argc; i++) {
  5a:	83 c4 10             	add    $0x10,%esp
  5d:	39 75 e4             	cmp    %esi,-0x1c(%ebp)
  60:	7e 29                	jle    8b <main+0x8b>
        if ((fd = open(argv[i], 0)) < 0) {
  62:	83 ec 08             	sub    $0x8,%esp
  65:	6a 00                	push   $0x0
  67:	ff 33                	push   (%ebx)
  69:	e8 bd 05 00 00       	call   62b <open>
  6e:	83 c4 10             	add    $0x10,%esp
  71:	89 c7                	mov    %eax,%edi
  73:	85 c0                	test   %eax,%eax
  75:	79 c9                	jns    40 <main+0x40>
            printf(1, "grep: cannot open %s\n", argv[i]);
  77:	50                   	push   %eax
  78:	ff 33                	push   (%ebx)
  7a:	68 88 0a 00 00       	push   $0xa88
  7f:	6a 01                	push   $0x1
  81:	e8 ba 06 00 00       	call   740 <printf>
            exit();
  86:	e8 38 05 00 00       	call   5c3 <exit>
    }
    exit();
  8b:	e8 33 05 00 00       	call   5c3 <exit>
        printf(2, "usage: grep pattern [file ...]\n");
  90:	51                   	push   %ecx
  91:	51                   	push   %ecx
  92:	68 68 0a 00 00       	push   $0xa68
  97:	6a 02                	push   $0x2
  99:	e8 a2 06 00 00       	call   740 <printf>
        exit();
  9e:	e8 20 05 00 00       	call   5c3 <exit>
        grep(pattern, 0);
  a3:	52                   	push   %edx
  a4:	52                   	push   %edx
  a5:	6a 00                	push   $0x0
  a7:	50                   	push   %eax
  a8:	e8 23 01 00 00       	call   1d0 <grep>
        exit();
  ad:	e8 11 05 00 00       	call   5c3 <exit>
  b2:	66 90                	xchg   %ax,%ax
  b4:	66 90                	xchg   %ax,%ax
  b6:	66 90                	xchg   %ax,%ax
  b8:	66 90                	xchg   %ax,%ax
  ba:	66 90                	xchg   %ax,%ax
  bc:	66 90                	xchg   %ax,%ax
  be:	66 90                	xchg   %ax,%ax

000000c0 <matchhere>:
    while (*text++ != '\0');
    return 0;
}

// matchhere: search for re at beginning of text
int matchhere(char *re, char *text){
  c0:	55                   	push   %ebp
  c1:	89 e5                	mov    %esp,%ebp
  c3:	57                   	push   %edi
  c4:	56                   	push   %esi
  c5:	53                   	push   %ebx
  c6:	83 ec 0c             	sub    $0xc,%esp
  c9:	8b 75 08             	mov    0x8(%ebp),%esi
  cc:	8b 7d 0c             	mov    0xc(%ebp),%edi
    if (re[0] == '\0') {
  cf:	0f b6 06             	movzbl (%esi),%eax
  d2:	84 c0                	test   %al,%al
  d4:	75 2d                	jne    103 <matchhere+0x43>
  d6:	e9 7d 00 00 00       	jmp    158 <matchhere+0x98>
  db:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
  df:	90                   	nop
    }
    if (re[1] == '*') {
        return matchstar(re[0], re + 2, text);
    }
    if (re[0] == '$' && re[1] == '\0') {
        return *text == '\0';
  e0:	0f b6 0f             	movzbl (%edi),%ecx
    if (re[0] == '$' && re[1] == '\0') {
  e3:	80 fb 24             	cmp    $0x24,%bl
  e6:	75 04                	jne    ec <matchhere+0x2c>
  e8:	84 c0                	test   %al,%al
  ea:	74 79                	je     165 <matchhere+0xa5>
    }
    if (*text != '\0' && (re[0] == '.' || re[0] == *text)) {
  ec:	84 c9                	test   %cl,%cl
  ee:	74 58                	je     148 <matchhere+0x88>
  f0:	38 d9                	cmp    %bl,%cl
  f2:	74 05                	je     f9 <matchhere+0x39>
  f4:	80 fb 2e             	cmp    $0x2e,%bl
  f7:	75 4f                	jne    148 <matchhere+0x88>
        return matchhere(re + 1, text + 1);
  f9:	83 c7 01             	add    $0x1,%edi
  fc:	83 c6 01             	add    $0x1,%esi
    if (re[0] == '\0') {
  ff:	84 c0                	test   %al,%al
 101:	74 55                	je     158 <matchhere+0x98>
    if (re[1] == '*') {
 103:	0f be d8             	movsbl %al,%ebx
 106:	0f b6 46 01          	movzbl 0x1(%esi),%eax
 10a:	3c 2a                	cmp    $0x2a,%al
 10c:	75 d2                	jne    e0 <matchhere+0x20>
        return matchstar(re[0], re + 2, text);
 10e:	83 c6 02             	add    $0x2,%esi
    }
    return 0;
}

// matchstar: search for c*re at beginning of text
int matchstar(int c, char *re, char *text) {
 111:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
    do { // a * matches zero or more instances
        if (matchhere(re, text)) {
 118:	83 ec 08             	sub    $0x8,%esp
 11b:	57                   	push   %edi
 11c:	56                   	push   %esi
 11d:	e8 9e ff ff ff       	call   c0 <matchhere>
 122:	83 c4 10             	add    $0x10,%esp
 125:	85 c0                	test   %eax,%eax
 127:	75 2f                	jne    158 <matchhere+0x98>
            return 1;
        }
    }
    while (*text != '\0' && (*text++ == c || c == '.'));
 129:	0f be 17             	movsbl (%edi),%edx
 12c:	84 d2                	test   %dl,%dl
 12e:	74 0c                	je     13c <matchhere+0x7c>
 130:	83 c7 01             	add    $0x1,%edi
 133:	83 fb 2e             	cmp    $0x2e,%ebx
 136:	74 e0                	je     118 <matchhere+0x58>
 138:	39 da                	cmp    %ebx,%edx
 13a:	74 dc                	je     118 <matchhere+0x58>
}
 13c:	8d 65 f4             	lea    -0xc(%ebp),%esp
 13f:	5b                   	pop    %ebx
 140:	5e                   	pop    %esi
 141:	5f                   	pop    %edi
 142:	5d                   	pop    %ebp
 143:	c3                   	ret    
 144:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 148:	8d 65 f4             	lea    -0xc(%ebp),%esp
    return 0;
 14b:	31 c0                	xor    %eax,%eax
}
 14d:	5b                   	pop    %ebx
 14e:	5e                   	pop    %esi
 14f:	5f                   	pop    %edi
 150:	5d                   	pop    %ebp
 151:	c3                   	ret    
 152:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
 158:	8d 65 f4             	lea    -0xc(%ebp),%esp
        return 1;
 15b:	b8 01 00 00 00       	mov    $0x1,%eax
}
 160:	5b                   	pop    %ebx
 161:	5e                   	pop    %esi
 162:	5f                   	pop    %edi
 163:	5d                   	pop    %ebp
 164:	c3                   	ret    
        return *text == '\0';
 165:	31 c0                	xor    %eax,%eax
 167:	84 c9                	test   %cl,%cl
 169:	0f 94 c0             	sete   %al
 16c:	eb ce                	jmp    13c <matchhere+0x7c>
 16e:	66 90                	xchg   %ax,%ax

00000170 <match>:
int match(char *re, char *text) {
 170:	55                   	push   %ebp
 171:	89 e5                	mov    %esp,%ebp
 173:	56                   	push   %esi
 174:	53                   	push   %ebx
 175:	8b 5d 08             	mov    0x8(%ebp),%ebx
 178:	8b 75 0c             	mov    0xc(%ebp),%esi
    if (re[0] == '^') {
 17b:	80 3b 5e             	cmpb   $0x5e,(%ebx)
 17e:	75 11                	jne    191 <match+0x21>
 180:	eb 2e                	jmp    1b0 <match+0x40>
 182:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
    while (*text++ != '\0');
 188:	83 c6 01             	add    $0x1,%esi
 18b:	80 7e ff 00          	cmpb   $0x0,-0x1(%esi)
 18f:	74 16                	je     1a7 <match+0x37>
        if (matchhere(re, text)) {
 191:	83 ec 08             	sub    $0x8,%esp
 194:	56                   	push   %esi
 195:	53                   	push   %ebx
 196:	e8 25 ff ff ff       	call   c0 <matchhere>
 19b:	83 c4 10             	add    $0x10,%esp
 19e:	85 c0                	test   %eax,%eax
 1a0:	74 e6                	je     188 <match+0x18>
            return 1;
 1a2:	b8 01 00 00 00       	mov    $0x1,%eax
}
 1a7:	8d 65 f8             	lea    -0x8(%ebp),%esp
 1aa:	5b                   	pop    %ebx
 1ab:	5e                   	pop    %esi
 1ac:	5d                   	pop    %ebp
 1ad:	c3                   	ret    
 1ae:	66 90                	xchg   %ax,%ax
        return matchhere(re + 1, text);
 1b0:	83 c3 01             	add    $0x1,%ebx
 1b3:	89 5d 08             	mov    %ebx,0x8(%ebp)
}
 1b6:	8d 65 f8             	lea    -0x8(%ebp),%esp
 1b9:	5b                   	pop    %ebx
 1ba:	5e                   	pop    %esi
 1bb:	5d                   	pop    %ebp
        return matchhere(re + 1, text);
 1bc:	e9 ff fe ff ff       	jmp    c0 <matchhere>
 1c1:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 1c8:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 1cf:	90                   	nop

000001d0 <grep>:
void grep(char *pattern, int fd) {
 1d0:	55                   	push   %ebp
 1d1:	89 e5                	mov    %esp,%ebp
 1d3:	57                   	push   %edi
 1d4:	56                   	push   %esi
 1d5:	53                   	push   %ebx
 1d6:	83 ec 1c             	sub    $0x1c,%esp
 1d9:	8b 7d 08             	mov    0x8(%ebp),%edi
    m = 0;
 1dc:	c7 45 dc 00 00 00 00 	movl   $0x0,-0x24(%ebp)
        return matchhere(re + 1, text);
 1e3:	8d 47 01             	lea    0x1(%edi),%eax
 1e6:	89 45 d8             	mov    %eax,-0x28(%ebp)
 1e9:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
    while ((n = read(fd, buf + m, sizeof(buf) - m - 1)) > 0) {
 1f0:	8b 4d dc             	mov    -0x24(%ebp),%ecx
 1f3:	b8 ff 03 00 00       	mov    $0x3ff,%eax
 1f8:	83 ec 04             	sub    $0x4,%esp
 1fb:	29 c8                	sub    %ecx,%eax
 1fd:	50                   	push   %eax
 1fe:	8d 81 a0 0e 00 00    	lea    0xea0(%ecx),%eax
 204:	50                   	push   %eax
 205:	ff 75 0c             	push   0xc(%ebp)
 208:	e8 ce 03 00 00       	call   5db <read>
 20d:	83 c4 10             	add    $0x10,%esp
 210:	85 c0                	test   %eax,%eax
 212:	0f 8e e5 00 00 00    	jle    2fd <grep+0x12d>
        m += n;
 218:	01 45 dc             	add    %eax,-0x24(%ebp)
 21b:	8b 4d dc             	mov    -0x24(%ebp),%ecx
        p = buf;
 21e:	c7 45 e4 a0 0e 00 00 	movl   $0xea0,-0x1c(%ebp)
        buf[m] = '\0';
 225:	c6 81 a0 0e 00 00 00 	movb   $0x0,0xea0(%ecx)
        while ((q = strchr(p, '\n')) != 0) {
 22c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 230:	83 ec 08             	sub    $0x8,%esp
 233:	6a 0a                	push   $0xa
 235:	ff 75 e4             	push   -0x1c(%ebp)
 238:	e8 13 02 00 00       	call   450 <strchr>
 23d:	83 c4 10             	add    $0x10,%esp
 240:	89 c3                	mov    %eax,%ebx
 242:	85 c0                	test   %eax,%eax
 244:	74 72                	je     2b8 <grep+0xe8>
            *q = 0;
 246:	c6 03 00             	movb   $0x0,(%ebx)
                write(1, p, q + 1 - p);
 249:	8d 43 01             	lea    0x1(%ebx),%eax
    if (re[0] == '^') {
 24c:	80 3f 5e             	cmpb   $0x5e,(%edi)
                write(1, p, q + 1 - p);
 24f:	89 45 e0             	mov    %eax,-0x20(%ebp)
 252:	8b 75 e4             	mov    -0x1c(%ebp),%esi
    if (re[0] == '^') {
 255:	75 12                	jne    269 <grep+0x99>
 257:	eb 47                	jmp    2a0 <grep+0xd0>
 259:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
    while (*text++ != '\0');
 260:	83 c6 01             	add    $0x1,%esi
 263:	80 7e ff 00          	cmpb   $0x0,-0x1(%esi)
 267:	74 2b                	je     294 <grep+0xc4>
        if (matchhere(re, text)) {
 269:	83 ec 08             	sub    $0x8,%esp
 26c:	56                   	push   %esi
 26d:	57                   	push   %edi
 26e:	e8 4d fe ff ff       	call   c0 <matchhere>
 273:	83 c4 10             	add    $0x10,%esp
 276:	85 c0                	test   %eax,%eax
 278:	74 e6                	je     260 <grep+0x90>
                write(1, p, q + 1 - p);
 27a:	8b 55 e4             	mov    -0x1c(%ebp),%edx
 27d:	8b 45 e0             	mov    -0x20(%ebp),%eax
 280:	83 ec 04             	sub    $0x4,%esp
                *q = '\n';
 283:	c6 03 0a             	movb   $0xa,(%ebx)
                write(1, p, q + 1 - p);
 286:	29 d0                	sub    %edx,%eax
 288:	50                   	push   %eax
 289:	52                   	push   %edx
 28a:	6a 01                	push   $0x1
 28c:	e8 a2 03 00 00       	call   633 <write>
 291:	83 c4 10             	add    $0x10,%esp
            p = q + 1;
 294:	8b 45 e0             	mov    -0x20(%ebp),%eax
 297:	89 45 e4             	mov    %eax,-0x1c(%ebp)
 29a:	eb 94                	jmp    230 <grep+0x60>
 29c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
        return matchhere(re + 1, text);
 2a0:	83 ec 08             	sub    $0x8,%esp
 2a3:	56                   	push   %esi
 2a4:	ff 75 d8             	push   -0x28(%ebp)
 2a7:	e8 14 fe ff ff       	call   c0 <matchhere>
 2ac:	83 c4 10             	add    $0x10,%esp
            if (match(pattern, p)) {
 2af:	85 c0                	test   %eax,%eax
 2b1:	74 e1                	je     294 <grep+0xc4>
 2b3:	eb c5                	jmp    27a <grep+0xaa>
 2b5:	8d 76 00             	lea    0x0(%esi),%esi
        if (p == buf) {
 2b8:	8b 55 e4             	mov    -0x1c(%ebp),%edx
 2bb:	81 fa a0 0e 00 00    	cmp    $0xea0,%edx
 2c1:	74 2e                	je     2f1 <grep+0x121>
        if (m > 0) {
 2c3:	8b 4d dc             	mov    -0x24(%ebp),%ecx
 2c6:	85 c9                	test   %ecx,%ecx
 2c8:	0f 8e 22 ff ff ff    	jle    1f0 <grep+0x20>
            m -= p - buf;
 2ce:	89 d0                	mov    %edx,%eax
            memmove(buf, p, m);
 2d0:	83 ec 04             	sub    $0x4,%esp
            m -= p - buf;
 2d3:	2d a0 0e 00 00       	sub    $0xea0,%eax
 2d8:	29 c1                	sub    %eax,%ecx
            memmove(buf, p, m);
 2da:	51                   	push   %ecx
 2db:	52                   	push   %edx
 2dc:	68 a0 0e 00 00       	push   $0xea0
            m -= p - buf;
 2e1:	89 4d dc             	mov    %ecx,-0x24(%ebp)
            memmove(buf, p, m);
 2e4:	e8 a7 02 00 00       	call   590 <memmove>
 2e9:	83 c4 10             	add    $0x10,%esp
 2ec:	e9 ff fe ff ff       	jmp    1f0 <grep+0x20>
            m = 0;
 2f1:	c7 45 dc 00 00 00 00 	movl   $0x0,-0x24(%ebp)
 2f8:	e9 f3 fe ff ff       	jmp    1f0 <grep+0x20>
}
 2fd:	8d 65 f4             	lea    -0xc(%ebp),%esp
 300:	5b                   	pop    %ebx
 301:	5e                   	pop    %esi
 302:	5f                   	pop    %edi
 303:	5d                   	pop    %ebp
 304:	c3                   	ret    
 305:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 30c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi

00000310 <matchstar>:
int matchstar(int c, char *re, char *text) {
 310:	55                   	push   %ebp
 311:	89 e5                	mov    %esp,%ebp
 313:	57                   	push   %edi
 314:	56                   	push   %esi
 315:	53                   	push   %ebx
 316:	83 ec 0c             	sub    $0xc,%esp
 319:	8b 5d 08             	mov    0x8(%ebp),%ebx
 31c:	8b 75 0c             	mov    0xc(%ebp),%esi
 31f:	8b 7d 10             	mov    0x10(%ebp),%edi
 322:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
        if (matchhere(re, text)) {
 328:	83 ec 08             	sub    $0x8,%esp
 32b:	57                   	push   %edi
 32c:	56                   	push   %esi
 32d:	e8 8e fd ff ff       	call   c0 <matchhere>
 332:	83 c4 10             	add    $0x10,%esp
 335:	85 c0                	test   %eax,%eax
 337:	75 1f                	jne    358 <matchstar+0x48>
    while (*text != '\0' && (*text++ == c || c == '.'));
 339:	0f be 17             	movsbl (%edi),%edx
 33c:	84 d2                	test   %dl,%dl
 33e:	74 0c                	je     34c <matchstar+0x3c>
 340:	83 c7 01             	add    $0x1,%edi
 343:	39 da                	cmp    %ebx,%edx
 345:	74 e1                	je     328 <matchstar+0x18>
 347:	83 fb 2e             	cmp    $0x2e,%ebx
 34a:	74 dc                	je     328 <matchstar+0x18>
}
 34c:	8d 65 f4             	lea    -0xc(%ebp),%esp
 34f:	5b                   	pop    %ebx
 350:	5e                   	pop    %esi
 351:	5f                   	pop    %edi
 352:	5d                   	pop    %ebp
 353:	c3                   	ret    
 354:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 358:	8d 65 f4             	lea    -0xc(%ebp),%esp
            return 1;
 35b:	b8 01 00 00 00       	mov    $0x1,%eax
}
 360:	5b                   	pop    %ebx
 361:	5e                   	pop    %esi
 362:	5f                   	pop    %edi
 363:	5d                   	pop    %ebp
 364:	c3                   	ret    
 365:	66 90                	xchg   %ax,%ax
 367:	66 90                	xchg   %ax,%ax
 369:	66 90                	xchg   %ax,%ax
 36b:	66 90                	xchg   %ax,%ax
 36d:	66 90                	xchg   %ax,%ax
 36f:	90                   	nop

00000370 <strcpy>:
#include "stat.h"
#include "fcntl.h"
#include "user.h"
#include "x86.h"

char*strcpy(char *s, const char *t) {
 370:	55                   	push   %ebp
    char *os;

    os = s;
    while ((*s++ = *t++) != 0) {
 371:	31 c0                	xor    %eax,%eax
char*strcpy(char *s, const char *t) {
 373:	89 e5                	mov    %esp,%ebp
 375:	53                   	push   %ebx
 376:	8b 4d 08             	mov    0x8(%ebp),%ecx
 379:	8b 5d 0c             	mov    0xc(%ebp),%ebx
 37c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
    while ((*s++ = *t++) != 0) {
 380:	0f b6 14 03          	movzbl (%ebx,%eax,1),%edx
 384:	88 14 01             	mov    %dl,(%ecx,%eax,1)
 387:	83 c0 01             	add    $0x1,%eax
 38a:	84 d2                	test   %dl,%dl
 38c:	75 f2                	jne    380 <strcpy+0x10>
        ;
    }
    return os;
}
 38e:	8b 5d fc             	mov    -0x4(%ebp),%ebx
 391:	89 c8                	mov    %ecx,%eax
 393:	c9                   	leave  
 394:	c3                   	ret    
 395:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 39c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi

000003a0 <strcmp>:

int strcmp(const char *p, const char *q) {
 3a0:	55                   	push   %ebp
 3a1:	89 e5                	mov    %esp,%ebp
 3a3:	53                   	push   %ebx
 3a4:	8b 55 08             	mov    0x8(%ebp),%edx
 3a7:	8b 4d 0c             	mov    0xc(%ebp),%ecx
    while (*p && *p == *q) {
 3aa:	0f b6 02             	movzbl (%edx),%eax
 3ad:	84 c0                	test   %al,%al
 3af:	75 17                	jne    3c8 <strcmp+0x28>
 3b1:	eb 3a                	jmp    3ed <strcmp+0x4d>
 3b3:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 3b7:	90                   	nop
 3b8:	0f b6 42 01          	movzbl 0x1(%edx),%eax
        p++, q++;
 3bc:	83 c2 01             	add    $0x1,%edx
 3bf:	8d 59 01             	lea    0x1(%ecx),%ebx
    while (*p && *p == *q) {
 3c2:	84 c0                	test   %al,%al
 3c4:	74 1a                	je     3e0 <strcmp+0x40>
        p++, q++;
 3c6:	89 d9                	mov    %ebx,%ecx
    while (*p && *p == *q) {
 3c8:	0f b6 19             	movzbl (%ecx),%ebx
 3cb:	38 c3                	cmp    %al,%bl
 3cd:	74 e9                	je     3b8 <strcmp+0x18>
    }
    return (uchar) * p - (uchar) * q;
 3cf:	29 d8                	sub    %ebx,%eax
}
 3d1:	8b 5d fc             	mov    -0x4(%ebp),%ebx
 3d4:	c9                   	leave  
 3d5:	c3                   	ret    
 3d6:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 3dd:	8d 76 00             	lea    0x0(%esi),%esi
    return (uchar) * p - (uchar) * q;
 3e0:	0f b6 59 01          	movzbl 0x1(%ecx),%ebx
 3e4:	31 c0                	xor    %eax,%eax
 3e6:	29 d8                	sub    %ebx,%eax
}
 3e8:	8b 5d fc             	mov    -0x4(%ebp),%ebx
 3eb:	c9                   	leave  
 3ec:	c3                   	ret    
    return (uchar) * p - (uchar) * q;
 3ed:	0f b6 19             	movzbl (%ecx),%ebx
 3f0:	31 c0                	xor    %eax,%eax
 3f2:	eb db                	jmp    3cf <strcmp+0x2f>
 3f4:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 3fb:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 3ff:	90                   	nop

00000400 <strlen>:

uint strlen(const char *s)      {
 400:	55                   	push   %ebp
 401:	89 e5                	mov    %esp,%ebp
 403:	8b 55 08             	mov    0x8(%ebp),%edx
    int n;

    for (n = 0; s[n]; n++) {
 406:	80 3a 00             	cmpb   $0x0,(%edx)
 409:	74 15                	je     420 <strlen+0x20>
 40b:	31 c0                	xor    %eax,%eax
 40d:	8d 76 00             	lea    0x0(%esi),%esi
 410:	83 c0 01             	add    $0x1,%eax
 413:	80 3c 02 00          	cmpb   $0x0,(%edx,%eax,1)
 417:	89 c1                	mov    %eax,%ecx
 419:	75 f5                	jne    410 <strlen+0x10>
        ;
    }
    return n;
}
 41b:	89 c8                	mov    %ecx,%eax
 41d:	5d                   	pop    %ebp
 41e:	c3                   	ret    
 41f:	90                   	nop
    for (n = 0; s[n]; n++) {
 420:	31 c9                	xor    %ecx,%ecx
}
 422:	5d                   	pop    %ebp
 423:	89 c8                	mov    %ecx,%eax
 425:	c3                   	ret    
 426:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 42d:	8d 76 00             	lea    0x0(%esi),%esi

00000430 <memset>:

void* memset(void *dst, int c, uint n) {
 430:	55                   	push   %ebp
 431:	89 e5                	mov    %esp,%ebp
 433:	57                   	push   %edi
 434:	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" :
 437:	8b 4d 10             	mov    0x10(%ebp),%ecx
 43a:	8b 45 0c             	mov    0xc(%ebp),%eax
 43d:	89 d7                	mov    %edx,%edi
 43f:	fc                   	cld    
 440:	f3 aa                	rep stos %al,%es:(%edi)
    stosb(dst, c, n);
    return dst;
}
 442:	8b 7d fc             	mov    -0x4(%ebp),%edi
 445:	89 d0                	mov    %edx,%eax
 447:	c9                   	leave  
 448:	c3                   	ret    
 449:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi

00000450 <strchr>:

char* strchr(const char *s, char c) {
 450:	55                   	push   %ebp
 451:	89 e5                	mov    %esp,%ebp
 453:	8b 45 08             	mov    0x8(%ebp),%eax
 456:	0f b6 4d 0c          	movzbl 0xc(%ebp),%ecx
    for (; *s; s++) {
 45a:	0f b6 10             	movzbl (%eax),%edx
 45d:	84 d2                	test   %dl,%dl
 45f:	75 12                	jne    473 <strchr+0x23>
 461:	eb 1d                	jmp    480 <strchr+0x30>
 463:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 467:	90                   	nop
 468:	0f b6 50 01          	movzbl 0x1(%eax),%edx
 46c:	83 c0 01             	add    $0x1,%eax
 46f:	84 d2                	test   %dl,%dl
 471:	74 0d                	je     480 <strchr+0x30>
        if (*s == c) {
 473:	38 d1                	cmp    %dl,%cl
 475:	75 f1                	jne    468 <strchr+0x18>
            return (char*)s;
        }
    }
    return 0;
}
 477:	5d                   	pop    %ebp
 478:	c3                   	ret    
 479:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
    return 0;
 480:	31 c0                	xor    %eax,%eax
}
 482:	5d                   	pop    %ebp
 483:	c3                   	ret    
 484:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 48b:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 48f:	90                   	nop

00000490 <gets>:

char* gets(char *buf, int max) {
 490:	55                   	push   %ebp
 491:	89 e5                	mov    %esp,%ebp
 493:	57                   	push   %edi
 494:	56                   	push   %esi
    int i, cc;
    char c;

    for (i = 0; i + 1 < max;) {
        cc = read(0, &c, 1);
 495:	8d 7d e7             	lea    -0x19(%ebp),%edi
char* gets(char *buf, int max) {
 498:	53                   	push   %ebx
    for (i = 0; i + 1 < max;) {
 499:	31 db                	xor    %ebx,%ebx
char* gets(char *buf, int max) {
 49b:	83 ec 1c             	sub    $0x1c,%esp
    for (i = 0; i + 1 < max;) {
 49e:	eb 27                	jmp    4c7 <gets+0x37>
        cc = read(0, &c, 1);
 4a0:	83 ec 04             	sub    $0x4,%esp
 4a3:	6a 01                	push   $0x1
 4a5:	57                   	push   %edi
 4a6:	6a 00                	push   $0x0
 4a8:	e8 2e 01 00 00       	call   5db <read>
        if (cc < 1) {
 4ad:	83 c4 10             	add    $0x10,%esp
 4b0:	85 c0                	test   %eax,%eax
 4b2:	7e 1d                	jle    4d1 <gets+0x41>
            break;
        }
        buf[i++] = c;
 4b4:	0f b6 45 e7          	movzbl -0x19(%ebp),%eax
 4b8:	8b 55 08             	mov    0x8(%ebp),%edx
 4bb:	88 44 1a ff          	mov    %al,-0x1(%edx,%ebx,1)
        if (c == '\n' || c == '\r') {
 4bf:	3c 0a                	cmp    $0xa,%al
 4c1:	74 1d                	je     4e0 <gets+0x50>
 4c3:	3c 0d                	cmp    $0xd,%al
 4c5:	74 19                	je     4e0 <gets+0x50>
    for (i = 0; i + 1 < max;) {
 4c7:	89 de                	mov    %ebx,%esi
 4c9:	83 c3 01             	add    $0x1,%ebx
 4cc:	3b 5d 0c             	cmp    0xc(%ebp),%ebx
 4cf:	7c cf                	jl     4a0 <gets+0x10>
            break;
        }
    }
    buf[i] = '\0';
 4d1:	8b 45 08             	mov    0x8(%ebp),%eax
 4d4:	c6 04 30 00          	movb   $0x0,(%eax,%esi,1)
    return buf;
}
 4d8:	8d 65 f4             	lea    -0xc(%ebp),%esp
 4db:	5b                   	pop    %ebx
 4dc:	5e                   	pop    %esi
 4dd:	5f                   	pop    %edi
 4de:	5d                   	pop    %ebp
 4df:	c3                   	ret    
    buf[i] = '\0';
 4e0:	8b 45 08             	mov    0x8(%ebp),%eax
 4e3:	89 de                	mov    %ebx,%esi
 4e5:	c6 04 30 00          	movb   $0x0,(%eax,%esi,1)
}
 4e9:	8d 65 f4             	lea    -0xc(%ebp),%esp
 4ec:	5b                   	pop    %ebx
 4ed:	5e                   	pop    %esi
 4ee:	5f                   	pop    %edi
 4ef:	5d                   	pop    %ebp
 4f0:	c3                   	ret    
 4f1:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 4f8:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 4ff:	90                   	nop

00000500 <stat>:

int stat(const char *n, struct stat *st) {
 500:	55                   	push   %ebp
 501:	89 e5                	mov    %esp,%ebp
 503:	56                   	push   %esi
 504:	53                   	push   %ebx
    int fd;
    int r;

    fd = open(n, O_RDONLY);
 505:	83 ec 08             	sub    $0x8,%esp
 508:	6a 00                	push   $0x0
 50a:	ff 75 08             	push   0x8(%ebp)
 50d:	e8 19 01 00 00       	call   62b <open>
    if (fd < 0) {
 512:	83 c4 10             	add    $0x10,%esp
 515:	85 c0                	test   %eax,%eax
 517:	78 27                	js     540 <stat+0x40>
        return -1;
    }
    r = fstat(fd, st);
 519:	83 ec 08             	sub    $0x8,%esp
 51c:	ff 75 0c             	push   0xc(%ebp)
 51f:	89 c3                	mov    %eax,%ebx
 521:	50                   	push   %eax
 522:	e8 cc 00 00 00       	call   5f3 <fstat>
    close(fd);
 527:	89 1c 24             	mov    %ebx,(%esp)
    r = fstat(fd, st);
 52a:	89 c6                	mov    %eax,%esi
    close(fd);
 52c:	e8 2a 01 00 00       	call   65b <close>
    return r;
 531:	83 c4 10             	add    $0x10,%esp
}
 534:	8d 65 f8             	lea    -0x8(%ebp),%esp
 537:	89 f0                	mov    %esi,%eax
 539:	5b                   	pop    %ebx
 53a:	5e                   	pop    %esi
 53b:	5d                   	pop    %ebp
 53c:	c3                   	ret    
 53d:	8d 76 00             	lea    0x0(%esi),%esi
        return -1;
 540:	be ff ff ff ff       	mov    $0xffffffff,%esi
 545:	eb ed                	jmp    534 <stat+0x34>
 547:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 54e:	66 90                	xchg   %ax,%ax

00000550 <atoi>:

int atoi(const char *s) {
 550:	55                   	push   %ebp
 551:	89 e5                	mov    %esp,%ebp
 553:	53                   	push   %ebx
 554:	8b 55 08             	mov    0x8(%ebp),%edx
    int n;

    n = 0;
    while ('0' <= *s && *s <= '9') {
 557:	0f be 02             	movsbl (%edx),%eax
 55a:	8d 48 d0             	lea    -0x30(%eax),%ecx
 55d:	80 f9 09             	cmp    $0x9,%cl
    n = 0;
 560:	b9 00 00 00 00       	mov    $0x0,%ecx
    while ('0' <= *s && *s <= '9') {
 565:	77 1e                	ja     585 <atoi+0x35>
 567:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 56e:	66 90                	xchg   %ax,%ax
        n = n * 10 + *s++ - '0';
 570:	83 c2 01             	add    $0x1,%edx
 573:	8d 0c 89             	lea    (%ecx,%ecx,4),%ecx
 576:	8d 4c 48 d0          	lea    -0x30(%eax,%ecx,2),%ecx
    while ('0' <= *s && *s <= '9') {
 57a:	0f be 02             	movsbl (%edx),%eax
 57d:	8d 58 d0             	lea    -0x30(%eax),%ebx
 580:	80 fb 09             	cmp    $0x9,%bl
 583:	76 eb                	jbe    570 <atoi+0x20>
    }
    return n;
}
 585:	8b 5d fc             	mov    -0x4(%ebp),%ebx
 588:	89 c8                	mov    %ecx,%eax
 58a:	c9                   	leave  
 58b:	c3                   	ret    
 58c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi

00000590 <memmove>:

void* memmove(void *vdst, const void *vsrc, int n) {
 590:	55                   	push   %ebp
 591:	89 e5                	mov    %esp,%ebp
 593:	57                   	push   %edi
 594:	8b 45 10             	mov    0x10(%ebp),%eax
 597:	8b 55 08             	mov    0x8(%ebp),%edx
 59a:	56                   	push   %esi
 59b:	8b 75 0c             	mov    0xc(%ebp),%esi
    char *dst;
    const char *src;

    dst = vdst;
    src = vsrc;
    while (n-- > 0) {
 59e:	85 c0                	test   %eax,%eax
 5a0:	7e 13                	jle    5b5 <memmove+0x25>
 5a2:	01 d0                	add    %edx,%eax
    dst = vdst;
 5a4:	89 d7                	mov    %edx,%edi
 5a6:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 5ad:	8d 76 00             	lea    0x0(%esi),%esi
        *dst++ = *src++;
 5b0:	a4                   	movsb  %ds:(%esi),%es:(%edi)
    while (n-- > 0) {
 5b1:	39 f8                	cmp    %edi,%eax
 5b3:	75 fb                	jne    5b0 <memmove+0x20>
    }
    return vdst;
}
 5b5:	5e                   	pop    %esi
 5b6:	89 d0                	mov    %edx,%eax
 5b8:	5f                   	pop    %edi
 5b9:	5d                   	pop    %ebp
 5ba:	c3                   	ret    

000005bb <fork>:
name: \
	movl	$SYS_ ## name, %eax; \
	int	$T_SYSCALL; \
	ret

SYSCALL(fork)
 5bb:	b8 01 00 00 00       	mov    $0x1,%eax
 5c0:	cd 40                	int    $0x40
 5c2:	c3                   	ret    

000005c3 <exit>:
SYSCALL(exit)
 5c3:	b8 02 00 00 00       	mov    $0x2,%eax
 5c8:	cd 40                	int    $0x40
 5ca:	c3                   	ret    

000005cb <wait>:
SYSCALL(wait)
 5cb:	b8 03 00 00 00       	mov    $0x3,%eax
 5d0:	cd 40                	int    $0x40
 5d2:	c3                   	ret    

000005d3 <pipe>:
SYSCALL(pipe)
 5d3:	b8 04 00 00 00       	mov    $0x4,%eax
 5d8:	cd 40                	int    $0x40
 5da:	c3                   	ret    

000005db <read>:
SYSCALL(read)
 5db:	b8 05 00 00 00       	mov    $0x5,%eax
 5e0:	cd 40                	int    $0x40
 5e2:	c3                   	ret    

000005e3 <kill>:
SYSCALL(kill)
 5e3:	b8 06 00 00 00       	mov    $0x6,%eax
 5e8:	cd 40                	int    $0x40
 5ea:	c3                   	ret    

000005eb <exec>:
SYSCALL(exec)
 5eb:	b8 07 00 00 00       	mov    $0x7,%eax
 5f0:	cd 40                	int    $0x40
 5f2:	c3                   	ret    

000005f3 <fstat>:
SYSCALL(fstat)
 5f3:	b8 08 00 00 00       	mov    $0x8,%eax
 5f8:	cd 40                	int    $0x40
 5fa:	c3                   	ret    

000005fb <chdir>:
SYSCALL(chdir)
 5fb:	b8 09 00 00 00       	mov    $0x9,%eax
 600:	cd 40                	int    $0x40
 602:	c3                   	ret    

00000603 <dup>:
SYSCALL(dup)
 603:	b8 0a 00 00 00       	mov    $0xa,%eax
 608:	cd 40                	int    $0x40
 60a:	c3                   	ret    

0000060b <getpid>:
SYSCALL(getpid)
 60b:	b8 0b 00 00 00       	mov    $0xb,%eax
 610:	cd 40                	int    $0x40
 612:	c3                   	ret    

00000613 <sbrk>:
SYSCALL(sbrk)
 613:	b8 0c 00 00 00       	mov    $0xc,%eax
 618:	cd 40                	int    $0x40
 61a:	c3                   	ret    

0000061b <sleep>:
SYSCALL(sleep)
 61b:	b8 0d 00 00 00       	mov    $0xd,%eax
 620:	cd 40                	int    $0x40
 622:	c3                   	ret    

00000623 <uptime>:
SYSCALL(uptime)
 623:	b8 0e 00 00 00       	mov    $0xe,%eax
 628:	cd 40                	int    $0x40
 62a:	c3                   	ret    

0000062b <open>:
SYSCALL(open)
 62b:	b8 0f 00 00 00       	mov    $0xf,%eax
 630:	cd 40                	int    $0x40
 632:	c3                   	ret    

00000633 <write>:
SYSCALL(write)
 633:	b8 10 00 00 00       	mov    $0x10,%eax
 638:	cd 40                	int    $0x40
 63a:	c3                   	ret    

0000063b <mknod>:
SYSCALL(mknod)
 63b:	b8 11 00 00 00       	mov    $0x11,%eax
 640:	cd 40                	int    $0x40
 642:	c3                   	ret    

00000643 <unlink>:
SYSCALL(unlink)
 643:	b8 12 00 00 00       	mov    $0x12,%eax
 648:	cd 40                	int    $0x40
 64a:	c3                   	ret    

0000064b <link>:
SYSCALL(link)
 64b:	b8 13 00 00 00       	mov    $0x13,%eax
 650:	cd 40                	int    $0x40
 652:	c3                   	ret    

00000653 <mkdir>:
SYSCALL(mkdir)
 653:	b8 14 00 00 00       	mov    $0x14,%eax
 658:	cd 40                	int    $0x40
 65a:	c3                   	ret    

0000065b <close>:
SYSCALL(close)
 65b:	b8 15 00 00 00       	mov    $0x15,%eax
 660:	cd 40                	int    $0x40
 662:	c3                   	ret    

00000663 <getch>:
SYSCALL(getch)
 663:	b8 16 00 00 00       	mov    $0x16,%eax
 668:	cd 40                	int    $0x40
 66a:	c3                   	ret    

0000066b <greeting>:
SYSCALL(greeting)
 66b:	b8 17 00 00 00       	mov    $0x17,%eax
 670:	cd 40                	int    $0x40
 672:	c3                   	ret    

00000673 <shutdown>:
SYSCALL(shutdown)
 673:	b8 18 00 00 00       	mov    $0x18,%eax
 678:	cd 40                	int    $0x40
 67a:	c3                   	ret    

0000067b <screen>:
SYSCALL(screen)
 67b:	b8 19 00 00 00       	mov    $0x19,%eax
 680:	cd 40                	int    $0x40
 682:	c3                   	ret    

00000683 <cls>:
SYSCALL(cls)
 683:	b8 1a 00 00 00       	mov    $0x1a,%eax
 688:	cd 40                	int    $0x40
 68a:	c3                   	ret    
 68b:	66 90                	xchg   %ax,%ax
 68d:	66 90                	xchg   %ax,%ax
 68f:	90                   	nop

00000690 <printint>:

static void putc(int fd, char c) {
    write(fd, &c, 1);
}

static void printint(int fd, int xx, int base, int sgn) {
 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 3c             	sub    $0x3c,%esp
 699:	89 4d c4             	mov    %ecx,-0x3c(%ebp)
    uint x;

    neg = 0;
    if (sgn && xx < 0) {
        neg = 1;
        x = -xx;
 69c:	89 d1                	mov    %edx,%ecx
static void printint(int fd, int xx, int base, int sgn) {
 69e:	89 45 b8             	mov    %eax,-0x48(%ebp)
    if (sgn && xx < 0) {
 6a1:	85 d2                	test   %edx,%edx
 6a3:	0f 89 7f 00 00 00    	jns    728 <printint+0x98>
 6a9:	f6 45 08 01          	testb  $0x1,0x8(%ebp)
 6ad:	74 79                	je     728 <printint+0x98>
        neg = 1;
 6af:	c7 45 bc 01 00 00 00 	movl   $0x1,-0x44(%ebp)
        x = -xx;
 6b6:	f7 d9                	neg    %ecx
    }
    else {
        x = xx;
    }

    i = 0;
 6b8:	31 db                	xor    %ebx,%ebx
 6ba:	8d 75 d7             	lea    -0x29(%ebp),%esi
 6bd:	8d 76 00             	lea    0x0(%esi),%esi
    do {
        buf[i++] = digits[x % base];
 6c0:	89 c8                	mov    %ecx,%eax
 6c2:	31 d2                	xor    %edx,%edx
 6c4:	89 cf                	mov    %ecx,%edi
 6c6:	f7 75 c4             	divl   -0x3c(%ebp)
 6c9:	0f b6 92 00 0b 00 00 	movzbl 0xb00(%edx),%edx
 6d0:	89 45 c0             	mov    %eax,-0x40(%ebp)
 6d3:	89 d8                	mov    %ebx,%eax
 6d5:	8d 5b 01             	lea    0x1(%ebx),%ebx
    }
    while ((x /= base) != 0);
 6d8:	8b 4d c0             	mov    -0x40(%ebp),%ecx
        buf[i++] = digits[x % base];
 6db:	88 14 1e             	mov    %dl,(%esi,%ebx,1)
    while ((x /= base) != 0);
 6de:	39 7d c4             	cmp    %edi,-0x3c(%ebp)
 6e1:	76 dd                	jbe    6c0 <printint+0x30>
    if (neg) {
 6e3:	8b 4d bc             	mov    -0x44(%ebp),%ecx
 6e6:	85 c9                	test   %ecx,%ecx
 6e8:	74 0c                	je     6f6 <printint+0x66>
        buf[i++] = '-';
 6ea:	c6 44 1d d8 2d       	movb   $0x2d,-0x28(%ebp,%ebx,1)
        buf[i++] = digits[x % base];
 6ef:	89 d8                	mov    %ebx,%eax
        buf[i++] = '-';
 6f1:	ba 2d 00 00 00       	mov    $0x2d,%edx
    }

    while (--i >= 0) {
 6f6:	8b 7d b8             	mov    -0x48(%ebp),%edi
 6f9:	8d 5c 05 d7          	lea    -0x29(%ebp,%eax,1),%ebx
 6fd:	eb 07                	jmp    706 <printint+0x76>
 6ff:	90                   	nop
        putc(fd, buf[i]);
 700:	0f b6 13             	movzbl (%ebx),%edx
 703:	83 eb 01             	sub    $0x1,%ebx
    write(fd, &c, 1);
 706:	83 ec 04             	sub    $0x4,%esp
 709:	88 55 d7             	mov    %dl,-0x29(%ebp)
 70c:	6a 01                	push   $0x1
 70e:	56                   	push   %esi
 70f:	57                   	push   %edi
 710:	e8 1e ff ff ff       	call   633 <write>
    while (--i >= 0) {
 715:	83 c4 10             	add    $0x10,%esp
 718:	39 de                	cmp    %ebx,%esi
 71a:	75 e4                	jne    700 <printint+0x70>
    }
}
 71c:	8d 65 f4             	lea    -0xc(%ebp),%esp
 71f:	5b                   	pop    %ebx
 720:	5e                   	pop    %esi
 721:	5f                   	pop    %edi
 722:	5d                   	pop    %ebp
 723:	c3                   	ret    
 724:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
    neg = 0;
 728:	c7 45 bc 00 00 00 00 	movl   $0x0,-0x44(%ebp)
 72f:	eb 87                	jmp    6b8 <printint+0x28>
 731:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 738:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 73f:	90                   	nop

00000740 <printf>:

// Print to the given fd. Only understands %d, %x, %p, %s.
void printf(int fd, const char *fmt, ...) {
 740:	55                   	push   %ebp
 741:	89 e5                	mov    %esp,%ebp
 743:	57                   	push   %edi
 744:	56                   	push   %esi
 745:	53                   	push   %ebx
 746:	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++) {
 749:	8b 5d 0c             	mov    0xc(%ebp),%ebx
void printf(int fd, const char *fmt, ...) {
 74c:	8b 75 08             	mov    0x8(%ebp),%esi
    for (i = 0; fmt[i]; i++) {
 74f:	0f b6 13             	movzbl (%ebx),%edx
 752:	84 d2                	test   %dl,%dl
 754:	74 6a                	je     7c0 <printf+0x80>
    ap = (uint*)(void*)&fmt + 1;
 756:	8d 45 10             	lea    0x10(%ebp),%eax
 759:	83 c3 01             	add    $0x1,%ebx
    write(fd, &c, 1);
 75c:	8d 7d e7             	lea    -0x19(%ebp),%edi
    state = 0;
 75f:	31 c9                	xor    %ecx,%ecx
    ap = (uint*)(void*)&fmt + 1;
 761:	89 45 d0             	mov    %eax,-0x30(%ebp)
 764:	eb 36                	jmp    79c <printf+0x5c>
 766:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 76d:	8d 76 00             	lea    0x0(%esi),%esi
 770:	89 4d d4             	mov    %ecx,-0x2c(%ebp)
        c = fmt[i] & 0xff;
        if (state == 0) {
            if (c == '%') {
                state = '%';
 773:	b9 25 00 00 00       	mov    $0x25,%ecx
            if (c == '%') {
 778:	83 f8 25             	cmp    $0x25,%eax
 77b:	74 15                	je     792 <printf+0x52>
    write(fd, &c, 1);
 77d:	83 ec 04             	sub    $0x4,%esp
 780:	88 55 e7             	mov    %dl,-0x19(%ebp)
 783:	6a 01                	push   $0x1
 785:	57                   	push   %edi
 786:	56                   	push   %esi
 787:	e8 a7 fe ff ff       	call   633 <write>
 78c:	8b 4d d4             	mov    -0x2c(%ebp),%ecx
            }
            else {
                putc(fd, c);
 78f:	83 c4 10             	add    $0x10,%esp
    for (i = 0; fmt[i]; i++) {
 792:	0f b6 13             	movzbl (%ebx),%edx
 795:	83 c3 01             	add    $0x1,%ebx
 798:	84 d2                	test   %dl,%dl
 79a:	74 24                	je     7c0 <printf+0x80>
        c = fmt[i] & 0xff;
 79c:	0f b6 c2             	movzbl %dl,%eax
        if (state == 0) {
 79f:	85 c9                	test   %ecx,%ecx
 7a1:	74 cd                	je     770 <printf+0x30>
            }
        }
        else if (state == '%') {
 7a3:	83 f9 25             	cmp    $0x25,%ecx
 7a6:	75 ea                	jne    792 <printf+0x52>
            if (c == 'd') {
 7a8:	83 f8 25             	cmp    $0x25,%eax
 7ab:	0f 84 07 01 00 00    	je     8b8 <printf+0x178>
 7b1:	83 e8 63             	sub    $0x63,%eax
 7b4:	83 f8 15             	cmp    $0x15,%eax
 7b7:	77 17                	ja     7d0 <printf+0x90>
 7b9:	ff 24 85 a8 0a 00 00 	jmp    *0xaa8(,%eax,4)
                putc(fd, c);
            }
            state = 0;
        }
    }
}
 7c0:	8d 65 f4             	lea    -0xc(%ebp),%esp
 7c3:	5b                   	pop    %ebx
 7c4:	5e                   	pop    %esi
 7c5:	5f                   	pop    %edi
 7c6:	5d                   	pop    %ebp
 7c7:	c3                   	ret    
 7c8:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 7cf:	90                   	nop
    write(fd, &c, 1);
 7d0:	83 ec 04             	sub    $0x4,%esp
 7d3:	88 55 d4             	mov    %dl,-0x2c(%ebp)
 7d6:	6a 01                	push   $0x1
 7d8:	57                   	push   %edi
 7d9:	56                   	push   %esi
 7da:	c6 45 e7 25          	movb   $0x25,-0x19(%ebp)
 7de:	e8 50 fe ff ff       	call   633 <write>
                putc(fd, c);
 7e3:	0f b6 55 d4          	movzbl -0x2c(%ebp),%edx
    write(fd, &c, 1);
 7e7:	83 c4 0c             	add    $0xc,%esp
 7ea:	88 55 e7             	mov    %dl,-0x19(%ebp)
 7ed:	6a 01                	push   $0x1
 7ef:	57                   	push   %edi
 7f0:	56                   	push   %esi
 7f1:	e8 3d fe ff ff       	call   633 <write>
                putc(fd, c);
 7f6:	83 c4 10             	add    $0x10,%esp
            state = 0;
 7f9:	31 c9                	xor    %ecx,%ecx
 7fb:	eb 95                	jmp    792 <printf+0x52>
 7fd:	8d 76 00             	lea    0x0(%esi),%esi
                printint(fd, *ap, 16, 0);
 800:	83 ec 0c             	sub    $0xc,%esp
 803:	b9 10 00 00 00       	mov    $0x10,%ecx
 808:	6a 00                	push   $0x0
 80a:	8b 45 d0             	mov    -0x30(%ebp),%eax
 80d:	8b 10                	mov    (%eax),%edx
 80f:	89 f0                	mov    %esi,%eax
 811:	e8 7a fe ff ff       	call   690 <printint>
                ap++;
 816:	83 45 d0 04          	addl   $0x4,-0x30(%ebp)
 81a:	83 c4 10             	add    $0x10,%esp
            state = 0;
 81d:	31 c9                	xor    %ecx,%ecx
 81f:	e9 6e ff ff ff       	jmp    792 <printf+0x52>
 824:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
                s = (char*)*ap;
 828:	8b 45 d0             	mov    -0x30(%ebp),%eax
 82b:	8b 10                	mov    (%eax),%edx
                ap++;
 82d:	83 c0 04             	add    $0x4,%eax
 830:	89 45 d0             	mov    %eax,-0x30(%ebp)
                if (s == 0) {
 833:	85 d2                	test   %edx,%edx
 835:	0f 84 8d 00 00 00    	je     8c8 <printf+0x188>
                while (*s != 0) {
 83b:	0f b6 02             	movzbl (%edx),%eax
            state = 0;
 83e:	31 c9                	xor    %ecx,%ecx
                while (*s != 0) {
 840:	84 c0                	test   %al,%al
 842:	0f 84 4a ff ff ff    	je     792 <printf+0x52>
 848:	89 5d d4             	mov    %ebx,-0x2c(%ebp)
 84b:	89 d3                	mov    %edx,%ebx
 84d:	8d 76 00             	lea    0x0(%esi),%esi
    write(fd, &c, 1);
 850:	83 ec 04             	sub    $0x4,%esp
                    s++;
 853:	83 c3 01             	add    $0x1,%ebx
 856:	88 45 e7             	mov    %al,-0x19(%ebp)
    write(fd, &c, 1);
 859:	6a 01                	push   $0x1
 85b:	57                   	push   %edi
 85c:	56                   	push   %esi
 85d:	e8 d1 fd ff ff       	call   633 <write>
                while (*s != 0) {
 862:	0f b6 03             	movzbl (%ebx),%eax
 865:	83 c4 10             	add    $0x10,%esp
 868:	84 c0                	test   %al,%al
 86a:	75 e4                	jne    850 <printf+0x110>
            state = 0;
 86c:	8b 5d d4             	mov    -0x2c(%ebp),%ebx
 86f:	31 c9                	xor    %ecx,%ecx
 871:	e9 1c ff ff ff       	jmp    792 <printf+0x52>
 876:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 87d:	8d 76 00             	lea    0x0(%esi),%esi
                printint(fd, *ap, 10, 1);
 880:	83 ec 0c             	sub    $0xc,%esp
 883:	b9 0a 00 00 00       	mov    $0xa,%ecx
 888:	6a 01                	push   $0x1
 88a:	e9 7b ff ff ff       	jmp    80a <printf+0xca>
 88f:	90                   	nop
                putc(fd, *ap);
 890:	8b 45 d0             	mov    -0x30(%ebp),%eax
    write(fd, &c, 1);
 893:	83 ec 04             	sub    $0x4,%esp
                putc(fd, *ap);
 896:	8b 00                	mov    (%eax),%eax
    write(fd, &c, 1);
 898:	6a 01                	push   $0x1
 89a:	57                   	push   %edi
 89b:	56                   	push   %esi
                putc(fd, *ap);
 89c:	88 45 e7             	mov    %al,-0x19(%ebp)
    write(fd, &c, 1);
 89f:	e8 8f fd ff ff       	call   633 <write>
                ap++;
 8a4:	83 45 d0 04          	addl   $0x4,-0x30(%ebp)
 8a8:	83 c4 10             	add    $0x10,%esp
            state = 0;
 8ab:	31 c9                	xor    %ecx,%ecx
 8ad:	e9 e0 fe ff ff       	jmp    792 <printf+0x52>
 8b2:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
                putc(fd, c);
 8b8:	88 55 e7             	mov    %dl,-0x19(%ebp)
    write(fd, &c, 1);
 8bb:	83 ec 04             	sub    $0x4,%esp
 8be:	e9 2a ff ff ff       	jmp    7ed <printf+0xad>
 8c3:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
 8c7:	90                   	nop
                    s = "(null)";
 8c8:	ba 9e 0a 00 00       	mov    $0xa9e,%edx
                while (*s != 0) {
 8cd:	89 5d d4             	mov    %ebx,-0x2c(%ebp)
 8d0:	b8 28 00 00 00       	mov    $0x28,%eax
 8d5:	89 d3                	mov    %edx,%ebx
 8d7:	e9 74 ff ff ff       	jmp    850 <printf+0x110>
 8dc:	66 90                	xchg   %ax,%ax
 8de:	66 90                	xchg   %ax,%ax

000008e0 <free>:
typedef union header Header;

static Header base;
static Header *freep;

void free(void *ap) {
 8e0:	55                   	push   %ebp
    Header *bp, *p;

    bp = (Header*)ap - 1;
    for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
 8e1:	a1 a0 12 00 00       	mov    0x12a0,%eax
void free(void *ap) {
 8e6:	89 e5                	mov    %esp,%ebp
 8e8:	57                   	push   %edi
 8e9:	56                   	push   %esi
 8ea:	53                   	push   %ebx
 8eb:	8b 5d 08             	mov    0x8(%ebp),%ebx
    bp = (Header*)ap - 1;
 8ee:	8d 4b f8             	lea    -0x8(%ebx),%ecx
    for (p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr) {
 8f1:	8d b4 26 00 00 00 00 	lea    0x0(%esi,%eiz,1),%esi
 8f8:	89 c2                	mov    %eax,%edx
 8fa:	8b 00                	mov    (%eax),%eax
 8fc:	39 ca                	cmp    %ecx,%edx
 8fe:	73 30                	jae    930 <free+0x50>
 900:	39 c1                	cmp    %eax,%ecx
 902:	72 04                	jb     908 <free+0x28>
        if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
 904:	39 c2                	cmp    %eax,%edx
 906:	72 f0                	jb     8f8 <free+0x18>
            break;
        }
    }
    if (bp + bp->s.size == p->s.ptr) {
 908:	8b 73 fc             	mov    -0x4(%ebx),%esi
 90b:	8d 3c f1             	lea    (%ecx,%esi,8),%edi
 90e:	39 f8                	cmp    %edi,%eax
 910:	74 30                	je     942 <free+0x62>
        bp->s.size += p->s.ptr->s.size;
        bp->s.ptr = p->s.ptr->s.ptr;
 912:	89 43 f8             	mov    %eax,-0x8(%ebx)
    }
    else {
        bp->s.ptr = p->s.ptr;
    }
    if (p + p->s.size == bp) {
 915:	8b 42 04             	mov    0x4(%edx),%eax
 918:	8d 34 c2             	lea    (%edx,%eax,8),%esi
 91b:	39 f1                	cmp    %esi,%ecx
 91d:	74 3a                	je     959 <free+0x79>
        p->s.size += bp->s.size;
        p->s.ptr = bp->s.ptr;
 91f:	89 0a                	mov    %ecx,(%edx)
    }
    else {
        p->s.ptr = bp;
    }
    freep = p;
}
 921:	5b                   	pop    %ebx
    freep = p;
 922:	89 15 a0 12 00 00    	mov    %edx,0x12a0
}
 928:	5e                   	pop    %esi
 929:	5f                   	pop    %edi
 92a:	5d                   	pop    %ebp
 92b:	c3                   	ret    
 92c:	8d 74 26 00          	lea    0x0(%esi,%eiz,1),%esi
        if (p >= p->s.ptr && (bp > p || bp < p->s.ptr)) {
 930:	39 c2                	cmp    %eax,%edx
 932:	72 c4                	jb     8f8 <free+0x18>
 934:	39 c1                	cmp    %eax,%ecx
 936:	73 c0                	jae    8f8 <free+0x18>
    if (bp + bp->s.size == p->s.ptr) {
 938:	8b 73 fc             	mov    -0x4(%ebx),%esi
 93b:	8d 3c f1             	lea    (%ecx,%esi,8),%edi
 93e:	39 f8                	cmp    %edi,%eax
 940:	75 d0                	jne    912 <free+0x32>
        bp->s.size += p->s.ptr->s.size;
 942:	03 70 04             	add    0x4(%eax),%esi
 945:	89 73 fc             	mov    %esi,-0x4(%ebx)
        bp->s.ptr = p->s.ptr->s.ptr;
 948:	8b 02                	mov    (%edx),%eax
 94a:	8b 00                	mov    (%eax),%eax
 94c:	89 43 f8             	mov    %eax,-0x8(%ebx)
    if (p + p->s.size == bp) {
 94f:	8b 42 04             	mov    0x4(%edx),%eax
 952:	8d 34 c2             	lea    (%edx,%eax,8),%esi
 955:	39 f1                	cmp    %esi,%ecx
 957:	75 c6                	jne    91f <free+0x3f>
        p->s.size += bp->s.size;
 959:	03 43 fc             	add    -0x4(%ebx),%eax
    freep = p;
 95c:	89 15 a0 12 00 00    	mov    %edx,0x12a0
        p->s.size += bp->s.size;
 962:	89 42 04             	mov    %eax,0x4(%edx)
        p->s.ptr = bp->s.ptr;
 965:	8b 4b f8             	mov    -0x8(%ebx),%ecx
 968:	89 0a                	mov    %ecx,(%edx)
}
 96a:	5b                   	pop    %ebx
 96b:	5e                   	pop    %esi
 96c:	5f                   	pop    %edi
 96d:	5d                   	pop    %ebp
 96e:	c3                   	ret    
 96f:	90                   	nop

00000970 <malloc>:
    hp->s.size = nu;
    free((void*)(hp + 1));
    return freep;
}

void* malloc(uint nbytes) {
 970:	55                   	push   %ebp
 971:	89 e5                	mov    %esp,%ebp
 973:	57                   	push   %edi
 974:	56                   	push   %esi
 975:	53                   	push   %ebx
 976:	83 ec 1c             	sub    $0x1c,%esp
    Header *p, *prevp;
    uint nunits;

    nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
 979:	8b 45 08             	mov    0x8(%ebp),%eax
    if ((prevp = freep) == 0) {
 97c:	8b 3d a0 12 00 00    	mov    0x12a0,%edi
    nunits = (nbytes + sizeof(Header) - 1) / sizeof(Header) + 1;
 982:	8d 70 07             	lea    0x7(%eax),%esi
 985:	c1 ee 03             	shr    $0x3,%esi
 988:	83 c6 01             	add    $0x1,%esi
    if ((prevp = freep) == 0) {
 98b:	85 ff                	test   %edi,%edi
 98d:	0f 84 9d 00 00 00    	je     a30 <malloc+0xc0>
        base.s.ptr = freep = prevp = &base;
        base.s.size = 0;
    }
    for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
 993:	8b 17                	mov    (%edi),%edx
        if (p->s.size >= nunits) {
 995:	8b 4a 04             	mov    0x4(%edx),%ecx
 998:	39 f1                	cmp    %esi,%ecx
 99a:	73 6a                	jae    a06 <malloc+0x96>
 99c:	bb 00 10 00 00       	mov    $0x1000,%ebx
 9a1:	39 de                	cmp    %ebx,%esi
 9a3:	0f 43 de             	cmovae %esi,%ebx
    p = sbrk(nu * sizeof(Header));
 9a6:	8d 04 dd 00 00 00 00 	lea    0x0(,%ebx,8),%eax
 9ad:	89 45 e4             	mov    %eax,-0x1c(%ebp)
 9b0:	eb 17                	jmp    9c9 <malloc+0x59>
 9b2:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
    for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
 9b8:	8b 02                	mov    (%edx),%eax
        if (p->s.size >= nunits) {
 9ba:	8b 48 04             	mov    0x4(%eax),%ecx
 9bd:	39 f1                	cmp    %esi,%ecx
 9bf:	73 4f                	jae    a10 <malloc+0xa0>
                p->s.size = nunits;
            }
            freep = prevp;
            return (void*)(p + 1);
        }
        if (p == freep) {
 9c1:	8b 3d a0 12 00 00    	mov    0x12a0,%edi
 9c7:	89 c2                	mov    %eax,%edx
 9c9:	39 d7                	cmp    %edx,%edi
 9cb:	75 eb                	jne    9b8 <malloc+0x48>
    p = sbrk(nu * sizeof(Header));
 9cd:	83 ec 0c             	sub    $0xc,%esp
 9d0:	ff 75 e4             	push   -0x1c(%ebp)
 9d3:	e8 3b fc ff ff       	call   613 <sbrk>
    if (p == (char*)-1) {
 9d8:	83 c4 10             	add    $0x10,%esp
 9db:	83 f8 ff             	cmp    $0xffffffff,%eax
 9de:	74 1c                	je     9fc <malloc+0x8c>
    hp->s.size = nu;
 9e0:	89 58 04             	mov    %ebx,0x4(%eax)
    free((void*)(hp + 1));
 9e3:	83 ec 0c             	sub    $0xc,%esp
 9e6:	83 c0 08             	add    $0x8,%eax
 9e9:	50                   	push   %eax
 9ea:	e8 f1 fe ff ff       	call   8e0 <free>
    return freep;
 9ef:	8b 15 a0 12 00 00    	mov    0x12a0,%edx
            if ((p = morecore(nunits)) == 0) {
 9f5:	83 c4 10             	add    $0x10,%esp
 9f8:	85 d2                	test   %edx,%edx
 9fa:	75 bc                	jne    9b8 <malloc+0x48>
                return 0;
            }
        }
    }
}
 9fc:	8d 65 f4             	lea    -0xc(%ebp),%esp
                return 0;
 9ff:	31 c0                	xor    %eax,%eax
}
 a01:	5b                   	pop    %ebx
 a02:	5e                   	pop    %esi
 a03:	5f                   	pop    %edi
 a04:	5d                   	pop    %ebp
 a05:	c3                   	ret    
        if (p->s.size >= nunits) {
 a06:	89 d0                	mov    %edx,%eax
 a08:	89 fa                	mov    %edi,%edx
 a0a:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
            if (p->s.size == nunits) {
 a10:	39 ce                	cmp    %ecx,%esi
 a12:	74 4c                	je     a60 <malloc+0xf0>
                p->s.size -= nunits;
 a14:	29 f1                	sub    %esi,%ecx
 a16:	89 48 04             	mov    %ecx,0x4(%eax)
                p += p->s.size;
 a19:	8d 04 c8             	lea    (%eax,%ecx,8),%eax
                p->s.size = nunits;
 a1c:	89 70 04             	mov    %esi,0x4(%eax)
            freep = prevp;
 a1f:	89 15 a0 12 00 00    	mov    %edx,0x12a0
}
 a25:	8d 65 f4             	lea    -0xc(%ebp),%esp
            return (void*)(p + 1);
 a28:	83 c0 08             	add    $0x8,%eax
}
 a2b:	5b                   	pop    %ebx
 a2c:	5e                   	pop    %esi
 a2d:	5f                   	pop    %edi
 a2e:	5d                   	pop    %ebp
 a2f:	c3                   	ret    
        base.s.ptr = freep = prevp = &base;
 a30:	c7 05 a0 12 00 00 a4 	movl   $0x12a4,0x12a0
 a37:	12 00 00 
        base.s.size = 0;
 a3a:	bf a4 12 00 00       	mov    $0x12a4,%edi
        base.s.ptr = freep = prevp = &base;
 a3f:	c7 05 a4 12 00 00 a4 	movl   $0x12a4,0x12a4
 a46:	12 00 00 
    for (p = prevp->s.ptr;; prevp = p, p = p->s.ptr) {
 a49:	89 fa                	mov    %edi,%edx
        base.s.size = 0;
 a4b:	c7 05 a8 12 00 00 00 	movl   $0x0,0x12a8
 a52:	00 00 00 
        if (p->s.size >= nunits) {
 a55:	e9 42 ff ff ff       	jmp    99c <malloc+0x2c>
 a5a:	8d b6 00 00 00 00    	lea    0x0(%esi),%esi
                prevp->s.ptr = p->s.ptr;
 a60:	8b 08                	mov    (%eax),%ecx
 a62:	89 0a                	mov    %ecx,(%edx)
 a64:	eb b9                	jmp    a1f <malloc+0xaf>