--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uprogs/zombie.asm	Sun Oct 22 18:25:39 2017 +0900
@@ -0,0 +1,1651 @@
+
+_zombie:     file format elf32-littlearm
+
+
+Disassembly of section .text:
+
+00000000 <main>:
+#include "stat.h"
+#include "user.h"
+
+int
+main(void)
+{
+   0:	e92d4800 	push	{fp, lr}
+   4:	e28db004 	add	fp, sp, #4
+  if(fork() > 0){
+   8:	eb0000a8 	bl	2b0 <fork>
+   c:	e3500000 	cmp	r0, #0
+  10:	da000005 	ble	2c <main+0x2c>
+    sleep(5);  // Let child exit before parent.
+  14:	e3a00005 	mov	r0, #5
+  18:	eb00019b 	bl	68c <sleep>
+    printf(2, "Parent exits!\n");
+  1c:	e3a00002 	mov	r0, #2
+  20:	e59f1014 	ldr	r1, [pc, #20]	; 3c <main+0x3c>
+  24:	eb000201 	bl	830 <printf>
+    exit();
+  28:	eb0000ad 	bl	2e4 <exit>
+  }
+  printf(2, "Child exits!\n");
+  2c:	e3a00002 	mov	r0, #2
+  30:	e59f1008 	ldr	r1, [pc, #8]	; 40 <main+0x40>
+  34:	eb0001fd 	bl	830 <printf>
+  exit();
+  38:	eb0000a9 	bl	2e4 <exit>
+  3c:	00000b18 	.word	0x00000b18
+  40:	00000b28 	.word	0x00000b28
+
+00000044 <strcpy>:
+#include "user.h"
+#include "arm.h"
+
+char*
+strcpy(char *s, char *t)
+{
+  44:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+  char *os;
+
+  os = s;
+  while((*s++ = *t++) != 0)
+  48:	e1a02000 	mov	r2, r0
+#include "user.h"
+#include "arm.h"
+
+char*
+strcpy(char *s, char *t)
+{
+  4c:	e28db000 	add	fp, sp, #0
+  char *os;
+
+  os = s;
+  while((*s++ = *t++) != 0)
+  50:	e4d13001 	ldrb	r3, [r1], #1
+  54:	e3530000 	cmp	r3, #0
+  58:	e4c23001 	strb	r3, [r2], #1
+  5c:	1afffffb 	bne	50 <strcpy+0xc>
+    ;
+  return os;
+}
+  60:	e28bd000 	add	sp, fp, #0
+  64:	e8bd0800 	pop	{fp}
+  68:	e12fff1e 	bx	lr
+
+0000006c <strcmp>:
+
+int
+strcmp(const char *p, const char *q)
+{
+  6c:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+  70:	e28db000 	add	fp, sp, #0
+  while(*p && *p == *q)
+  74:	e5d03000 	ldrb	r3, [r0]
+  78:	e5d12000 	ldrb	r2, [r1]
+  7c:	e3530000 	cmp	r3, #0
+  80:	1a000004 	bne	98 <strcmp+0x2c>
+  84:	ea000005 	b	a0 <strcmp+0x34>
+  88:	e5f03001 	ldrb	r3, [r0, #1]!
+  8c:	e3530000 	cmp	r3, #0
+  90:	0a000006 	beq	b0 <strcmp+0x44>
+  94:	e5f12001 	ldrb	r2, [r1, #1]!
+  98:	e1530002 	cmp	r3, r2
+  9c:	0afffff9 	beq	88 <strcmp+0x1c>
+    p++, q++;
+  return (uchar)*p - (uchar)*q;
+}
+  a0:	e0620003 	rsb	r0, r2, r3
+  a4:	e28bd000 	add	sp, fp, #0
+  a8:	e8bd0800 	pop	{fp}
+  ac:	e12fff1e 	bx	lr
+}
+
+int
+strcmp(const char *p, const char *q)
+{
+  while(*p && *p == *q)
+  b0:	e5d12001 	ldrb	r2, [r1, #1]
+  b4:	eafffff9 	b	a0 <strcmp+0x34>
+
+000000b8 <strlen>:
+  return (uchar)*p - (uchar)*q;
+}
+
+uint
+strlen(char *s)
+{
+  b8:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+  bc:	e28db000 	add	fp, sp, #0
+  int n;
+
+  for(n = 0; s[n]; n++)
+  c0:	e5d03000 	ldrb	r3, [r0]
+  c4:	e3530000 	cmp	r3, #0
+  c8:	01a00003 	moveq	r0, r3
+  cc:	0a000006 	beq	ec <strlen+0x34>
+  d0:	e1a02000 	mov	r2, r0
+  d4:	e3a03000 	mov	r3, #0
+  d8:	e5f21001 	ldrb	r1, [r2, #1]!
+  dc:	e2833001 	add	r3, r3, #1
+  e0:	e1a00003 	mov	r0, r3
+  e4:	e3510000 	cmp	r1, #0
+  e8:	1afffffa 	bne	d8 <strlen+0x20>
+    ;
+  return n;
+}
+  ec:	e28bd000 	add	sp, fp, #0
+  f0:	e8bd0800 	pop	{fp}
+  f4:	e12fff1e 	bx	lr
+
+000000f8 <memset>:
+memset(void *dst, int c, uint n)
+{
+  char *p=dst;
+  u32 rc=n;
+
+  while (rc-- > 0) *p++ = c;
+  f8:	e3520000 	cmp	r2, #0
+  return n;
+}
+
+void*
+memset(void *dst, int c, uint n)
+{
+  fc:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+ 100:	e28db000 	add	fp, sp, #0
+  char *p=dst;
+  u32 rc=n;
+
+  while (rc-- > 0) *p++ = c;
+ 104:	0a000006 	beq	124 <memset+0x2c>
+ 108:	e6ef1071 	uxtb	r1, r1
+ 10c:	e1a03002 	mov	r3, r2
+}
+
+void*
+memset(void *dst, int c, uint n)
+{
+  char *p=dst;
+ 110:	e1a0c000 	mov	ip, r0
+  u32 rc=n;
+
+  while (rc-- > 0) *p++ = c;
+ 114:	e2533001 	subs	r3, r3, #1
+ 118:	e4cc1001 	strb	r1, [ip], #1
+ 11c:	1afffffc 	bne	114 <memset+0x1c>
+ 120:	e0800002 	add	r0, r0, r2
+  return (void *)p;
+}
+ 124:	e28bd000 	add	sp, fp, #0
+ 128:	e8bd0800 	pop	{fp}
+ 12c:	e12fff1e 	bx	lr
+
+00000130 <strchr>:
+
+char*
+strchr(const char *s, char c)
+{
+ 130:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+ 134:	e28db000 	add	fp, sp, #0
+  for(; *s; s++)
+ 138:	e5d03000 	ldrb	r3, [r0]
+ 13c:	e3530000 	cmp	r3, #0
+ 140:	1a000004 	bne	158 <strchr+0x28>
+ 144:	ea000008 	b	16c <strchr+0x3c>
+ 148:	e5d03001 	ldrb	r3, [r0, #1]
+ 14c:	e2800001 	add	r0, r0, #1
+ 150:	e3530000 	cmp	r3, #0
+ 154:	0a000004 	beq	16c <strchr+0x3c>
+    if(*s == c)
+ 158:	e1530001 	cmp	r3, r1
+ 15c:	1afffff9 	bne	148 <strchr+0x18>
+      return (char*)s;
+  return 0;
+}
+ 160:	e28bd000 	add	sp, fp, #0
+ 164:	e8bd0800 	pop	{fp}
+ 168:	e12fff1e 	bx	lr
+strchr(const char *s, char c)
+{
+  for(; *s; s++)
+    if(*s == c)
+      return (char*)s;
+  return 0;
+ 16c:	e1a00003 	mov	r0, r3
+ 170:	eafffffa 	b	160 <strchr+0x30>
+
+00000174 <gets>:
+}
+
+char*
+gets(char *buf, int max)
+{
+ 174:	e92d49f0 	push	{r4, r5, r6, r7, r8, fp, lr}
+ 178:	e28db018 	add	fp, sp, #24
+ 17c:	e24dd00c 	sub	sp, sp, #12
+ 180:	e1a08000 	mov	r8, r0
+ 184:	e1a07001 	mov	r7, r1
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+ 188:	e1a06000 	mov	r6, r0
+ 18c:	e3a05000 	mov	r5, #0
+ 190:	ea000008 	b	1b8 <gets+0x44>
+    cc = read(0, &c, 1);
+ 194:	eb000079 	bl	380 <read>
+    if(cc < 1)
+ 198:	e3500000 	cmp	r0, #0
+ 19c:	da00000b 	ble	1d0 <gets+0x5c>
+      break;
+    buf[i++] = c;
+ 1a0:	e55b301d 	ldrb	r3, [fp, #-29]
+    if(c == '\n' || c == '\r')
+ 1a4:	e1a05004 	mov	r5, r4
+ 1a8:	e353000a 	cmp	r3, #10
+ 1ac:	1353000d 	cmpne	r3, #13
+
+  for(i=0; i+1 < max; ){
+    cc = read(0, &c, 1);
+    if(cc < 1)
+      break;
+    buf[i++] = c;
+ 1b0:	e4c63001 	strb	r3, [r6], #1
+    if(c == '\n' || c == '\r')
+ 1b4:	0a00000a 	beq	1e4 <gets+0x70>
+{
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+    cc = read(0, &c, 1);
+ 1b8:	e3a02001 	mov	r2, #1
+gets(char *buf, int max)
+{
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+ 1bc:	e0854002 	add	r4, r5, r2
+ 1c0:	e1540007 	cmp	r4, r7
+    cc = read(0, &c, 1);
+ 1c4:	e3a00000 	mov	r0, #0
+ 1c8:	e24b101d 	sub	r1, fp, #29
+gets(char *buf, int max)
+{
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+ 1cc:	bafffff0 	blt	194 <gets+0x20>
+      break;
+    buf[i++] = c;
+    if(c == '\n' || c == '\r')
+      break;
+  }
+  buf[i] = '\0';
+ 1d0:	e3a03000 	mov	r3, #0
+ 1d4:	e7c83005 	strb	r3, [r8, r5]
+  return buf;
+}
+ 1d8:	e1a00008 	mov	r0, r8
+ 1dc:	e24bd018 	sub	sp, fp, #24
+ 1e0:	e8bd89f0 	pop	{r4, r5, r6, r7, r8, fp, pc}
+gets(char *buf, int max)
+{
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+ 1e4:	e1a05004 	mov	r5, r4
+ 1e8:	eafffff8 	b	1d0 <gets+0x5c>
+
+000001ec <stat>:
+  return buf;
+}
+
+int
+stat(char *n, struct stat *st)
+{
+ 1ec:	e92d4830 	push	{r4, r5, fp, lr}
+ 1f0:	e1a05001 	mov	r5, r1
+ 1f4:	e28db00c 	add	fp, sp, #12
+  int fd;
+  int r;
+
+  fd = open(n, O_RDONLY);
+ 1f8:	e3a01000 	mov	r1, #0
+ 1fc:	eb0000a0 	bl	484 <open>
+  if(fd < 0)
+ 200:	e2504000 	subs	r4, r0, #0
+    return -1;
+ 204:	b3e05000 	mvnlt	r5, #0
+{
+  int fd;
+  int r;
+
+  fd = open(n, O_RDONLY);
+  if(fd < 0)
+ 208:	ba000004 	blt	220 <stat+0x34>
+    return -1;
+  r = fstat(fd, st);
+ 20c:	e1a01005 	mov	r1, r5
+ 210:	eb0000c2 	bl	520 <fstat>
+ 214:	e1a05000 	mov	r5, r0
+  close(fd);
+ 218:	e1a00004 	mov	r0, r4
+ 21c:	eb000071 	bl	3e8 <close>
+  return r;
+}
+ 220:	e1a00005 	mov	r0, r5
+ 224:	e8bd8830 	pop	{r4, r5, fp, pc}
+
+00000228 <atoi>:
+
+int
+atoi(const char *s)
+{
+ 228:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+ 22c:	e28db000 	add	fp, sp, #0
+  int n;
+
+  n = 0;
+  while('0' <= *s && *s <= '9')
+ 230:	e5d03000 	ldrb	r3, [r0]
+ 234:	e2432030 	sub	r2, r3, #48	; 0x30
+ 238:	e6ef2072 	uxtb	r2, r2
+ 23c:	e3520009 	cmp	r2, #9
+int
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+ 240:	83a00000 	movhi	r0, #0
+  while('0' <= *s && *s <= '9')
+ 244:	8a000009 	bhi	270 <atoi+0x48>
+ 248:	e1a02000 	mov	r2, r0
+int
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+ 24c:	e3a00000 	mov	r0, #0
+  while('0' <= *s && *s <= '9')
+    n = n*10 + *s++ - '0';
+ 250:	e0800100 	add	r0, r0, r0, lsl #2
+ 254:	e0830080 	add	r0, r3, r0, lsl #1
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+  while('0' <= *s && *s <= '9')
+ 258:	e5f23001 	ldrb	r3, [r2, #1]!
+    n = n*10 + *s++ - '0';
+ 25c:	e2400030 	sub	r0, r0, #48	; 0x30
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+  while('0' <= *s && *s <= '9')
+ 260:	e2431030 	sub	r1, r3, #48	; 0x30
+ 264:	e6ef1071 	uxtb	r1, r1
+ 268:	e3510009 	cmp	r1, #9
+ 26c:	9afffff7 	bls	250 <atoi+0x28>
+    n = n*10 + *s++ - '0';
+  return n;
+}
+ 270:	e28bd000 	add	sp, fp, #0
+ 274:	e8bd0800 	pop	{fp}
+ 278:	e12fff1e 	bx	lr
+
+0000027c <memmove>:
+{
+  char *dst, *src;
+  
+  dst = vdst;
+  src = vsrc;
+  while(n-- > 0)
+ 27c:	e3520000 	cmp	r2, #0
+  return n;
+}
+
+void*
+memmove(void *vdst, void *vsrc, int n)
+{
+ 280:	e52db004 	push	{fp}		; (str fp, [sp, #-4]!)
+ 284:	e28db000 	add	fp, sp, #0
+  char *dst, *src;
+  
+  dst = vdst;
+  src = vsrc;
+  while(n-- > 0)
+ 288:	da000005 	ble	2a4 <memmove+0x28>
+    n = n*10 + *s++ - '0';
+  return n;
+}
+
+void*
+memmove(void *vdst, void *vsrc, int n)
+ 28c:	e0802002 	add	r2, r0, r2
+{
+  char *dst, *src;
+  
+  dst = vdst;
+ 290:	e1a03000 	mov	r3, r0
+  src = vsrc;
+  while(n-- > 0)
+    *dst++ = *src++;
+ 294:	e4d1c001 	ldrb	ip, [r1], #1
+ 298:	e4c3c001 	strb	ip, [r3], #1
+{
+  char *dst, *src;
+  
+  dst = vdst;
+  src = vsrc;
+  while(n-- > 0)
+ 29c:	e1530002 	cmp	r3, r2
+ 2a0:	1afffffb 	bne	294 <memmove+0x18>
+    *dst++ = *src++;
+  return vdst;
+}
+ 2a4:	e28bd000 	add	sp, fp, #0
+ 2a8:	e8bd0800 	pop	{fp}
+ 2ac:	e12fff1e 	bx	lr
+
+000002b0 <fork>:
+ 2b0:	e92d4000 	push	{lr}
+ 2b4:	e92d0008 	push	{r3}
+ 2b8:	e92d0004 	push	{r2}
+ 2bc:	e92d0002 	push	{r1}
+ 2c0:	e92d0001 	push	{r0}
+ 2c4:	e3a00001 	mov	r0, #1
+ 2c8:	ef000040 	svc	0x00000040
+ 2cc:	e8bd0002 	pop	{r1}
+ 2d0:	e8bd0002 	pop	{r1}
+ 2d4:	e8bd0004 	pop	{r2}
+ 2d8:	e8bd0008 	pop	{r3}
+ 2dc:	e8bd4000 	pop	{lr}
+ 2e0:	e12fff1e 	bx	lr
+
+000002e4 <exit>:
+ 2e4:	e92d4000 	push	{lr}
+ 2e8:	e92d0008 	push	{r3}
+ 2ec:	e92d0004 	push	{r2}
+ 2f0:	e92d0002 	push	{r1}
+ 2f4:	e92d0001 	push	{r0}
+ 2f8:	e3a00002 	mov	r0, #2
+ 2fc:	ef000040 	svc	0x00000040
+ 300:	e8bd0002 	pop	{r1}
+ 304:	e8bd0002 	pop	{r1}
+ 308:	e8bd0004 	pop	{r2}
+ 30c:	e8bd0008 	pop	{r3}
+ 310:	e8bd4000 	pop	{lr}
+ 314:	e12fff1e 	bx	lr
+
+00000318 <wait>:
+ 318:	e92d4000 	push	{lr}
+ 31c:	e92d0008 	push	{r3}
+ 320:	e92d0004 	push	{r2}
+ 324:	e92d0002 	push	{r1}
+ 328:	e92d0001 	push	{r0}
+ 32c:	e3a00003 	mov	r0, #3
+ 330:	ef000040 	svc	0x00000040
+ 334:	e8bd0002 	pop	{r1}
+ 338:	e8bd0002 	pop	{r1}
+ 33c:	e8bd0004 	pop	{r2}
+ 340:	e8bd0008 	pop	{r3}
+ 344:	e8bd4000 	pop	{lr}
+ 348:	e12fff1e 	bx	lr
+
+0000034c <pipe>:
+ 34c:	e92d4000 	push	{lr}
+ 350:	e92d0008 	push	{r3}
+ 354:	e92d0004 	push	{r2}
+ 358:	e92d0002 	push	{r1}
+ 35c:	e92d0001 	push	{r0}
+ 360:	e3a00004 	mov	r0, #4
+ 364:	ef000040 	svc	0x00000040
+ 368:	e8bd0002 	pop	{r1}
+ 36c:	e8bd0002 	pop	{r1}
+ 370:	e8bd0004 	pop	{r2}
+ 374:	e8bd0008 	pop	{r3}
+ 378:	e8bd4000 	pop	{lr}
+ 37c:	e12fff1e 	bx	lr
+
+00000380 <read>:
+ 380:	e92d4000 	push	{lr}
+ 384:	e92d0008 	push	{r3}
+ 388:	e92d0004 	push	{r2}
+ 38c:	e92d0002 	push	{r1}
+ 390:	e92d0001 	push	{r0}
+ 394:	e3a00005 	mov	r0, #5
+ 398:	ef000040 	svc	0x00000040
+ 39c:	e8bd0002 	pop	{r1}
+ 3a0:	e8bd0002 	pop	{r1}
+ 3a4:	e8bd0004 	pop	{r2}
+ 3a8:	e8bd0008 	pop	{r3}
+ 3ac:	e8bd4000 	pop	{lr}
+ 3b0:	e12fff1e 	bx	lr
+
+000003b4 <write>:
+ 3b4:	e92d4000 	push	{lr}
+ 3b8:	e92d0008 	push	{r3}
+ 3bc:	e92d0004 	push	{r2}
+ 3c0:	e92d0002 	push	{r1}
+ 3c4:	e92d0001 	push	{r0}
+ 3c8:	e3a00010 	mov	r0, #16
+ 3cc:	ef000040 	svc	0x00000040
+ 3d0:	e8bd0002 	pop	{r1}
+ 3d4:	e8bd0002 	pop	{r1}
+ 3d8:	e8bd0004 	pop	{r2}
+ 3dc:	e8bd0008 	pop	{r3}
+ 3e0:	e8bd4000 	pop	{lr}
+ 3e4:	e12fff1e 	bx	lr
+
+000003e8 <close>:
+ 3e8:	e92d4000 	push	{lr}
+ 3ec:	e92d0008 	push	{r3}
+ 3f0:	e92d0004 	push	{r2}
+ 3f4:	e92d0002 	push	{r1}
+ 3f8:	e92d0001 	push	{r0}
+ 3fc:	e3a00015 	mov	r0, #21
+ 400:	ef000040 	svc	0x00000040
+ 404:	e8bd0002 	pop	{r1}
+ 408:	e8bd0002 	pop	{r1}
+ 40c:	e8bd0004 	pop	{r2}
+ 410:	e8bd0008 	pop	{r3}
+ 414:	e8bd4000 	pop	{lr}
+ 418:	e12fff1e 	bx	lr
+
+0000041c <kill>:
+ 41c:	e92d4000 	push	{lr}
+ 420:	e92d0008 	push	{r3}
+ 424:	e92d0004 	push	{r2}
+ 428:	e92d0002 	push	{r1}
+ 42c:	e92d0001 	push	{r0}
+ 430:	e3a00006 	mov	r0, #6
+ 434:	ef000040 	svc	0x00000040
+ 438:	e8bd0002 	pop	{r1}
+ 43c:	e8bd0002 	pop	{r1}
+ 440:	e8bd0004 	pop	{r2}
+ 444:	e8bd0008 	pop	{r3}
+ 448:	e8bd4000 	pop	{lr}
+ 44c:	e12fff1e 	bx	lr
+
+00000450 <exec>:
+ 450:	e92d4000 	push	{lr}
+ 454:	e92d0008 	push	{r3}
+ 458:	e92d0004 	push	{r2}
+ 45c:	e92d0002 	push	{r1}
+ 460:	e92d0001 	push	{r0}
+ 464:	e3a00007 	mov	r0, #7
+ 468:	ef000040 	svc	0x00000040
+ 46c:	e8bd0002 	pop	{r1}
+ 470:	e8bd0002 	pop	{r1}
+ 474:	e8bd0004 	pop	{r2}
+ 478:	e8bd0008 	pop	{r3}
+ 47c:	e8bd4000 	pop	{lr}
+ 480:	e12fff1e 	bx	lr
+
+00000484 <open>:
+ 484:	e92d4000 	push	{lr}
+ 488:	e92d0008 	push	{r3}
+ 48c:	e92d0004 	push	{r2}
+ 490:	e92d0002 	push	{r1}
+ 494:	e92d0001 	push	{r0}
+ 498:	e3a0000f 	mov	r0, #15
+ 49c:	ef000040 	svc	0x00000040
+ 4a0:	e8bd0002 	pop	{r1}
+ 4a4:	e8bd0002 	pop	{r1}
+ 4a8:	e8bd0004 	pop	{r2}
+ 4ac:	e8bd0008 	pop	{r3}
+ 4b0:	e8bd4000 	pop	{lr}
+ 4b4:	e12fff1e 	bx	lr
+
+000004b8 <mknod>:
+ 4b8:	e92d4000 	push	{lr}
+ 4bc:	e92d0008 	push	{r3}
+ 4c0:	e92d0004 	push	{r2}
+ 4c4:	e92d0002 	push	{r1}
+ 4c8:	e92d0001 	push	{r0}
+ 4cc:	e3a00011 	mov	r0, #17
+ 4d0:	ef000040 	svc	0x00000040
+ 4d4:	e8bd0002 	pop	{r1}
+ 4d8:	e8bd0002 	pop	{r1}
+ 4dc:	e8bd0004 	pop	{r2}
+ 4e0:	e8bd0008 	pop	{r3}
+ 4e4:	e8bd4000 	pop	{lr}
+ 4e8:	e12fff1e 	bx	lr
+
+000004ec <unlink>:
+ 4ec:	e92d4000 	push	{lr}
+ 4f0:	e92d0008 	push	{r3}
+ 4f4:	e92d0004 	push	{r2}
+ 4f8:	e92d0002 	push	{r1}
+ 4fc:	e92d0001 	push	{r0}
+ 500:	e3a00012 	mov	r0, #18
+ 504:	ef000040 	svc	0x00000040
+ 508:	e8bd0002 	pop	{r1}
+ 50c:	e8bd0002 	pop	{r1}
+ 510:	e8bd0004 	pop	{r2}
+ 514:	e8bd0008 	pop	{r3}
+ 518:	e8bd4000 	pop	{lr}
+ 51c:	e12fff1e 	bx	lr
+
+00000520 <fstat>:
+ 520:	e92d4000 	push	{lr}
+ 524:	e92d0008 	push	{r3}
+ 528:	e92d0004 	push	{r2}
+ 52c:	e92d0002 	push	{r1}
+ 530:	e92d0001 	push	{r0}
+ 534:	e3a00008 	mov	r0, #8
+ 538:	ef000040 	svc	0x00000040
+ 53c:	e8bd0002 	pop	{r1}
+ 540:	e8bd0002 	pop	{r1}
+ 544:	e8bd0004 	pop	{r2}
+ 548:	e8bd0008 	pop	{r3}
+ 54c:	e8bd4000 	pop	{lr}
+ 550:	e12fff1e 	bx	lr
+
+00000554 <link>:
+ 554:	e92d4000 	push	{lr}
+ 558:	e92d0008 	push	{r3}
+ 55c:	e92d0004 	push	{r2}
+ 560:	e92d0002 	push	{r1}
+ 564:	e92d0001 	push	{r0}
+ 568:	e3a00013 	mov	r0, #19
+ 56c:	ef000040 	svc	0x00000040
+ 570:	e8bd0002 	pop	{r1}
+ 574:	e8bd0002 	pop	{r1}
+ 578:	e8bd0004 	pop	{r2}
+ 57c:	e8bd0008 	pop	{r3}
+ 580:	e8bd4000 	pop	{lr}
+ 584:	e12fff1e 	bx	lr
+
+00000588 <mkdir>:
+ 588:	e92d4000 	push	{lr}
+ 58c:	e92d0008 	push	{r3}
+ 590:	e92d0004 	push	{r2}
+ 594:	e92d0002 	push	{r1}
+ 598:	e92d0001 	push	{r0}
+ 59c:	e3a00014 	mov	r0, #20
+ 5a0:	ef000040 	svc	0x00000040
+ 5a4:	e8bd0002 	pop	{r1}
+ 5a8:	e8bd0002 	pop	{r1}
+ 5ac:	e8bd0004 	pop	{r2}
+ 5b0:	e8bd0008 	pop	{r3}
+ 5b4:	e8bd4000 	pop	{lr}
+ 5b8:	e12fff1e 	bx	lr
+
+000005bc <chdir>:
+ 5bc:	e92d4000 	push	{lr}
+ 5c0:	e92d0008 	push	{r3}
+ 5c4:	e92d0004 	push	{r2}
+ 5c8:	e92d0002 	push	{r1}
+ 5cc:	e92d0001 	push	{r0}
+ 5d0:	e3a00009 	mov	r0, #9
+ 5d4:	ef000040 	svc	0x00000040
+ 5d8:	e8bd0002 	pop	{r1}
+ 5dc:	e8bd0002 	pop	{r1}
+ 5e0:	e8bd0004 	pop	{r2}
+ 5e4:	e8bd0008 	pop	{r3}
+ 5e8:	e8bd4000 	pop	{lr}
+ 5ec:	e12fff1e 	bx	lr
+
+000005f0 <dup>:
+ 5f0:	e92d4000 	push	{lr}
+ 5f4:	e92d0008 	push	{r3}
+ 5f8:	e92d0004 	push	{r2}
+ 5fc:	e92d0002 	push	{r1}
+ 600:	e92d0001 	push	{r0}
+ 604:	e3a0000a 	mov	r0, #10
+ 608:	ef000040 	svc	0x00000040
+ 60c:	e8bd0002 	pop	{r1}
+ 610:	e8bd0002 	pop	{r1}
+ 614:	e8bd0004 	pop	{r2}
+ 618:	e8bd0008 	pop	{r3}
+ 61c:	e8bd4000 	pop	{lr}
+ 620:	e12fff1e 	bx	lr
+
+00000624 <getpid>:
+ 624:	e92d4000 	push	{lr}
+ 628:	e92d0008 	push	{r3}
+ 62c:	e92d0004 	push	{r2}
+ 630:	e92d0002 	push	{r1}
+ 634:	e92d0001 	push	{r0}
+ 638:	e3a0000b 	mov	r0, #11
+ 63c:	ef000040 	svc	0x00000040
+ 640:	e8bd0002 	pop	{r1}
+ 644:	e8bd0002 	pop	{r1}
+ 648:	e8bd0004 	pop	{r2}
+ 64c:	e8bd0008 	pop	{r3}
+ 650:	e8bd4000 	pop	{lr}
+ 654:	e12fff1e 	bx	lr
+
+00000658 <sbrk>:
+ 658:	e92d4000 	push	{lr}
+ 65c:	e92d0008 	push	{r3}
+ 660:	e92d0004 	push	{r2}
+ 664:	e92d0002 	push	{r1}
+ 668:	e92d0001 	push	{r0}
+ 66c:	e3a0000c 	mov	r0, #12
+ 670:	ef000040 	svc	0x00000040
+ 674:	e8bd0002 	pop	{r1}
+ 678:	e8bd0002 	pop	{r1}
+ 67c:	e8bd0004 	pop	{r2}
+ 680:	e8bd0008 	pop	{r3}
+ 684:	e8bd4000 	pop	{lr}
+ 688:	e12fff1e 	bx	lr
+
+0000068c <sleep>:
+ 68c:	e92d4000 	push	{lr}
+ 690:	e92d0008 	push	{r3}
+ 694:	e92d0004 	push	{r2}
+ 698:	e92d0002 	push	{r1}
+ 69c:	e92d0001 	push	{r0}
+ 6a0:	e3a0000d 	mov	r0, #13
+ 6a4:	ef000040 	svc	0x00000040
+ 6a8:	e8bd0002 	pop	{r1}
+ 6ac:	e8bd0002 	pop	{r1}
+ 6b0:	e8bd0004 	pop	{r2}
+ 6b4:	e8bd0008 	pop	{r3}
+ 6b8:	e8bd4000 	pop	{lr}
+ 6bc:	e12fff1e 	bx	lr
+
+000006c0 <uptime>:
+ 6c0:	e92d4000 	push	{lr}
+ 6c4:	e92d0008 	push	{r3}
+ 6c8:	e92d0004 	push	{r2}
+ 6cc:	e92d0002 	push	{r1}
+ 6d0:	e92d0001 	push	{r0}
+ 6d4:	e3a0000e 	mov	r0, #14
+ 6d8:	ef000040 	svc	0x00000040
+ 6dc:	e8bd0002 	pop	{r1}
+ 6e0:	e8bd0002 	pop	{r1}
+ 6e4:	e8bd0004 	pop	{r2}
+ 6e8:	e8bd0008 	pop	{r3}
+ 6ec:	e8bd4000 	pop	{lr}
+ 6f0:	e12fff1e 	bx	lr
+
+000006f4 <putc>:
+#include "stat.h"
+#include "user.h"
+
+static void
+putc(int fd, char c)
+{
+ 6f4:	e92d4800 	push	{fp, lr}
+ 6f8:	e28db004 	add	fp, sp, #4
+ 6fc:	e24b3004 	sub	r3, fp, #4
+ 700:	e24dd008 	sub	sp, sp, #8
+  write(fd, &c, 1);
+ 704:	e3a02001 	mov	r2, #1
+#include "stat.h"
+#include "user.h"
+
+static void
+putc(int fd, char c)
+{
+ 708:	e5631001 	strb	r1, [r3, #-1]!
+  write(fd, &c, 1);
+ 70c:	e1a01003 	mov	r1, r3
+ 710:	ebffff27 	bl	3b4 <write>
+}
+ 714:	e24bd004 	sub	sp, fp, #4
+ 718:	e8bd8800 	pop	{fp, pc}
+
+0000071c <printint>:
+    return q;
+}
+
+static void
+printint(int fd, int xx, int base, int sgn)
+{
+ 71c:	e92d4ff0 	push	{r4, r5, r6, r7, r8, r9, sl, fp, lr}
+ 720:	e1a04000 	mov	r4, r0
+  char buf[16];
+  int i, neg;
+  uint x, y, b;
+
+  neg = 0;
+  if(sgn && xx < 0){
+ 724:	e1a00fa1 	lsr	r0, r1, #31
+ 728:	e3530000 	cmp	r3, #0
+ 72c:	03a03000 	moveq	r3, #0
+ 730:	12003001 	andne	r3, r0, #1
+    return q;
+}
+
+static void
+printint(int fd, int xx, int base, int sgn)
+{
+ 734:	e28db020 	add	fp, sp, #32
+  char buf[16];
+  int i, neg;
+  uint x, y, b;
+
+  neg = 0;
+  if(sgn && xx < 0){
+ 738:	e3530000 	cmp	r3, #0
+    return q;
+}
+
+static void
+printint(int fd, int xx, int base, int sgn)
+{
+ 73c:	e24dd014 	sub	sp, sp, #20
+ 740:	e59f909c 	ldr	r9, [pc, #156]	; 7e4 <printint+0xc8>
+  uint x, y, b;
+
+  neg = 0;
+  if(sgn && xx < 0){
+    neg = 1;
+    x = -xx;
+ 744:	12611000 	rsbne	r1, r1, #0
+  int i, neg;
+  uint x, y, b;
+
+  neg = 0;
+  if(sgn && xx < 0){
+    neg = 1;
+ 748:	13a03001 	movne	r3, #1
+  } else {
+    x = xx;
+  }
+
+  b = base;
+  i = 0;
+ 74c:	e3a0a000 	mov	sl, #0
+ 750:	e24b6034 	sub	r6, fp, #52	; 0x34
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+        if(r >= d) {
+            r = r - d;
+            q = q | (1 << i);
+ 754:	e3a08001 	mov	r8, #1
+  write(fd, &c, 1);
+}
+
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+ 758:	e3a07000 	mov	r7, #0
+    int i;
+
+    for(i=31;i>=0;i--){
+ 75c:	e3a0001f 	mov	r0, #31
+  write(fd, &c, 1);
+}
+
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+ 760:	e1a0c007 	mov	ip, r7
+    int i;
+
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+ 764:	e1a0e031 	lsr	lr, r1, r0
+ 768:	e20ee001 	and	lr, lr, #1
+ 76c:	e18ec08c 	orr	ip, lr, ip, lsl #1
+        if(r >= d) {
+ 770:	e152000c 	cmp	r2, ip
+            r = r - d;
+            q = q | (1 << i);
+ 774:	91877018 	orrls	r7, r7, r8, lsl r0
+
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+        if(r >= d) {
+            r = r - d;
+ 778:	9062c00c 	rsbls	ip, r2, ip
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+    int i;
+
+    for(i=31;i>=0;i--){
+ 77c:	e2500001 	subs	r0, r0, #1
+ 780:	2afffff7 	bcs	764 <printint+0x48>
+
+  b = base;
+  i = 0;
+  do{
+    y = div(x, b);
+    buf[i++] = digits[x - y * b];
+ 784:	e0000792 	mul	r0, r2, r7
+  }while((x = y) != 0);
+ 788:	e3570000 	cmp	r7, #0
+
+  b = base;
+  i = 0;
+  do{
+    y = div(x, b);
+    buf[i++] = digits[x - y * b];
+ 78c:	e0601001 	rsb	r1, r0, r1
+ 790:	e28a5001 	add	r5, sl, #1
+ 794:	e7d91001 	ldrb	r1, [r9, r1]
+ 798:	e7c6100a 	strb	r1, [r6, sl]
+  }while((x = y) != 0);
+ 79c:	11a01007 	movne	r1, r7
+
+  b = base;
+  i = 0;
+  do{
+    y = div(x, b);
+    buf[i++] = digits[x - y * b];
+ 7a0:	11a0a005 	movne	sl, r5
+ 7a4:	1affffeb 	bne	758 <printint+0x3c>
+  }while((x = y) != 0);
+  if(neg)
+ 7a8:	e3530000 	cmp	r3, #0
+    buf[i++] = '-';
+ 7ac:	124b2024 	subne	r2, fp, #36	; 0x24
+ 7b0:	10823005 	addne	r3, r2, r5
+ 7b4:	128a5002 	addne	r5, sl, #2
+
+  while(--i >= 0)
+ 7b8:	e2455001 	sub	r5, r5, #1
+  do{
+    y = div(x, b);
+    buf[i++] = digits[x - y * b];
+  }while((x = y) != 0);
+  if(neg)
+    buf[i++] = '-';
+ 7bc:	13a0202d 	movne	r2, #45	; 0x2d
+ 7c0:	15432010 	strbne	r2, [r3, #-16]
+
+  while(--i >= 0)
+    putc(fd, buf[i]);
+ 7c4:	e7d61005 	ldrb	r1, [r6, r5]
+ 7c8:	e1a00004 	mov	r0, r4
+    buf[i++] = digits[x - y * b];
+  }while((x = y) != 0);
+  if(neg)
+    buf[i++] = '-';
+
+  while(--i >= 0)
+ 7cc:	e2455001 	sub	r5, r5, #1
+    putc(fd, buf[i]);
+ 7d0:	ebffffc7 	bl	6f4 <putc>
+    buf[i++] = digits[x - y * b];
+  }while((x = y) != 0);
+  if(neg)
+    buf[i++] = '-';
+
+  while(--i >= 0)
+ 7d4:	e3750001 	cmn	r5, #1
+ 7d8:	1afffff9 	bne	7c4 <printint+0xa8>
+    putc(fd, buf[i]);
+}
+ 7dc:	e24bd020 	sub	sp, fp, #32
+ 7e0:	e8bd8ff0 	pop	{r4, r5, r6, r7, r8, r9, sl, fp, pc}
+ 7e4:	00000b38 	.word	0x00000b38
+
+000007e8 <div>:
+  write(fd, &c, 1);
+}
+
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+ 7e8:	e3a03000 	mov	r3, #0
+{
+  write(fd, &c, 1);
+}
+
+u32 div(u32 n, u32 d)  // long division
+{
+ 7ec:	e92d0830 	push	{r4, r5, fp}
+ 7f0:	e1a02000 	mov	r2, r0
+ 7f4:	e28db008 	add	fp, sp, #8
+    u32 q=0, r=0;
+    int i;
+
+    for(i=31;i>=0;i--){
+ 7f8:	e3a0c01f 	mov	ip, #31
+  write(fd, &c, 1);
+}
+
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+ 7fc:	e1a00003 	mov	r0, r3
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+        if(r >= d) {
+            r = r - d;
+            q = q | (1 << i);
+ 800:	e3a05001 	mov	r5, #1
+    u32 q=0, r=0;
+    int i;
+
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+ 804:	e1a04c32 	lsr	r4, r2, ip
+ 808:	e2044001 	and	r4, r4, #1
+ 80c:	e1843083 	orr	r3, r4, r3, lsl #1
+        if(r >= d) {
+ 810:	e1530001 	cmp	r3, r1
+            r = r - d;
+            q = q | (1 << i);
+ 814:	21800c15 	orrcs	r0, r0, r5, lsl ip
+
+    for(i=31;i>=0;i--){
+        r = r << 1;
+        r = r | ((n >> i) & 1);
+        if(r >= d) {
+            r = r - d;
+ 818:	20613003 	rsbcs	r3, r1, r3
+u32 div(u32 n, u32 d)  // long division
+{
+    u32 q=0, r=0;
+    int i;
+
+    for(i=31;i>=0;i--){
+ 81c:	e25cc001 	subs	ip, ip, #1
+ 820:	2afffff7 	bcs	804 <div+0x1c>
+            r = r - d;
+            q = q | (1 << i);
+        }
+    }
+    return q;
+}
+ 824:	e24bd008 	sub	sp, fp, #8
+ 828:	e8bd0830 	pop	{r4, r5, fp}
+ 82c:	e12fff1e 	bx	lr
+
+00000830 <printf>:
+}
+
+// Print to the given fd. Only understands %d, %x, %p, %s.
+void
+printf(int fd, char *fmt, ...)
+{
+ 830:	e92d000e 	push	{r1, r2, r3}
+ 834:	e92d4ff0 	push	{r4, r5, r6, r7, r8, r9, sl, fp, lr}
+ 838:	e28db020 	add	fp, sp, #32
+ 83c:	e1a05000 	mov	r5, r0
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+ 840:	e59b4004 	ldr	r4, [fp, #4]
+ 844:	e5d48000 	ldrb	r8, [r4]
+ 848:	e3580000 	cmp	r8, #0
+ 84c:	0a000027 	beq	8f0 <printf+0xc0>
+        ap++;
+      } else if(c == 's'){
+        s = (char*)*ap;
+        ap++;
+        if(s == 0)
+          s = "(null)";
+ 850:	e59f712c 	ldr	r7, [pc, #300]	; 984 <printf+0x154>
+  char *s;
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+ 854:	e28b6008 	add	r6, fp, #8
+{
+  char *s;
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+ 858:	e3a0a000 	mov	sl, #0
+ 85c:	ea000008 	b	884 <printf+0x54>
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+    c = fmt[i] & 0xff;
+    if(state == 0){
+      if(c == '%'){
+ 860:	e3580025 	cmp	r8, #37	; 0x25
+        state = '%';
+ 864:	01a0a008 	moveq	sl, r8
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+    c = fmt[i] & 0xff;
+    if(state == 0){
+      if(c == '%'){
+ 868:	0a000002 	beq	878 <printf+0x48>
+        state = '%';
+      } else {
+        putc(fd, c);
+ 86c:	e1a00005 	mov	r0, r5
+ 870:	e1a01008 	mov	r1, r8
+ 874:	ebffff9e 	bl	6f4 <putc>
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+ 878:	e5f48001 	ldrb	r8, [r4, #1]!
+ 87c:	e3580000 	cmp	r8, #0
+ 880:	0a00001a 	beq	8f0 <printf+0xc0>
+    c = fmt[i] & 0xff;
+    if(state == 0){
+ 884:	e35a0000 	cmp	sl, #0
+ 888:	0afffff4 	beq	860 <printf+0x30>
+      if(c == '%'){
+        state = '%';
+      } else {
+        putc(fd, c);
+      }
+    } else if(state == '%'){
+ 88c:	e35a0025 	cmp	sl, #37	; 0x25
+ 890:	1afffff8 	bne	878 <printf+0x48>
+      if(c == 'd'){
+ 894:	e3580064 	cmp	r8, #100	; 0x64
+ 898:	0a00002c 	beq	950 <printf+0x120>
+        printint(fd, *ap, 10, 1);
+        ap++;
+      } else if(c == 'x' || c == 'p'){
+ 89c:	e3580078 	cmp	r8, #120	; 0x78
+ 8a0:	13580070 	cmpne	r8, #112	; 0x70
+ 8a4:	13a09000 	movne	r9, #0
+ 8a8:	03a09001 	moveq	r9, #1
+ 8ac:	0a000013 	beq	900 <printf+0xd0>
+        printint(fd, *ap, 16, 0);
+        ap++;
+      } else if(c == 's'){
+ 8b0:	e3580073 	cmp	r8, #115	; 0x73
+ 8b4:	0a000018 	beq	91c <printf+0xec>
+          s = "(null)";
+        while(*s != 0){
+          putc(fd, *s);
+          s++;
+        }
+      } else if(c == 'c'){
+ 8b8:	e3580063 	cmp	r8, #99	; 0x63
+ 8bc:	0a00002a 	beq	96c <printf+0x13c>
+        putc(fd, *ap);
+        ap++;
+      } else if(c == '%'){
+ 8c0:	e3580025 	cmp	r8, #37	; 0x25
+        putc(fd, c);
+ 8c4:	e1a0100a 	mov	r1, sl
+ 8c8:	e1a00005 	mov	r0, r5
+          s++;
+        }
+      } else if(c == 'c'){
+        putc(fd, *ap);
+        ap++;
+      } else if(c == '%'){
+ 8cc:	0a000002 	beq	8dc <printf+0xac>
+        putc(fd, c);
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+ 8d0:	ebffff87 	bl	6f4 <putc>
+        putc(fd, c);
+ 8d4:	e1a00005 	mov	r0, r5
+ 8d8:	e1a01008 	mov	r1, r8
+ 8dc:	ebffff84 	bl	6f4 <putc>
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+ 8e0:	e5f48001 	ldrb	r8, [r4, #1]!
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+ 8e4:	e1a0a009 	mov	sl, r9
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+ 8e8:	e3580000 	cmp	r8, #0
+ 8ec:	1affffe4 	bne	884 <printf+0x54>
+        putc(fd, c);
+      }
+      state = 0;
+    }
+  }
+}
+ 8f0:	e24bd020 	sub	sp, fp, #32
+ 8f4:	e8bd4ff0 	pop	{r4, r5, r6, r7, r8, r9, sl, fp, lr}
+ 8f8:	e28dd00c 	add	sp, sp, #12
+ 8fc:	e12fff1e 	bx	lr
+    } else if(state == '%'){
+      if(c == 'd'){
+        printint(fd, *ap, 10, 1);
+        ap++;
+      } else if(c == 'x' || c == 'p'){
+        printint(fd, *ap, 16, 0);
+ 900:	e1a00005 	mov	r0, r5
+ 904:	e4961004 	ldr	r1, [r6], #4
+ 908:	e3a02010 	mov	r2, #16
+ 90c:	e3a03000 	mov	r3, #0
+ 910:	ebffff81 	bl	71c <printint>
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+ 914:	e3a0a000 	mov	sl, #0
+ 918:	eaffffd6 	b	878 <printf+0x48>
+        ap++;
+      } else if(c == 'x' || c == 'p'){
+        printint(fd, *ap, 16, 0);
+        ap++;
+      } else if(c == 's'){
+        s = (char*)*ap;
+ 91c:	e4968004 	ldr	r8, [r6], #4
+        ap++;
+        if(s == 0)
+          s = "(null)";
+ 920:	e3580000 	cmp	r8, #0
+ 924:	01a08007 	moveq	r8, r7
+        while(*s != 0){
+ 928:	e5d81000 	ldrb	r1, [r8]
+ 92c:	e3510000 	cmp	r1, #0
+ 930:	0a000004 	beq	948 <printf+0x118>
+          putc(fd, *s);
+ 934:	e1a00005 	mov	r0, r5
+ 938:	ebffff6d 	bl	6f4 <putc>
+      } else if(c == 's'){
+        s = (char*)*ap;
+        ap++;
+        if(s == 0)
+          s = "(null)";
+        while(*s != 0){
+ 93c:	e5f81001 	ldrb	r1, [r8, #1]!
+ 940:	e3510000 	cmp	r1, #0
+ 944:	1afffffa 	bne	934 <printf+0x104>
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+ 948:	e1a0a001 	mov	sl, r1
+ 94c:	eaffffc9 	b	878 <printf+0x48>
+      } else {
+        putc(fd, c);
+      }
+    } else if(state == '%'){
+      if(c == 'd'){
+        printint(fd, *ap, 10, 1);
+ 950:	e1a00005 	mov	r0, r5
+ 954:	e4961004 	ldr	r1, [r6], #4
+ 958:	e3a0200a 	mov	r2, #10
+ 95c:	e3a03001 	mov	r3, #1
+ 960:	ebffff6d 	bl	71c <printint>
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+ 964:	e3a0a000 	mov	sl, #0
+ 968:	eaffffc2 	b	878 <printf+0x48>
+        while(*s != 0){
+          putc(fd, *s);
+          s++;
+        }
+      } else if(c == 'c'){
+        putc(fd, *ap);
+ 96c:	e4961004 	ldr	r1, [r6], #4
+ 970:	e1a00005 	mov	r0, r5
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+ 974:	e1a0a009 	mov	sl, r9
+        while(*s != 0){
+          putc(fd, *s);
+          s++;
+        }
+      } else if(c == 'c'){
+        putc(fd, *ap);
+ 978:	e6ef1071 	uxtb	r1, r1
+ 97c:	ebffff5c 	bl	6f4 <putc>
+ 980:	eaffffbc 	b	878 <printf+0x48>
+ 984:	00000b4c 	.word	0x00000b4c
+
+00000988 <free>:
+free(void *ap)
+{
+  Header *bp, *p;
+
+  bp = (Header*)ap - 1;
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+ 988:	e59f3098 	ldr	r3, [pc, #152]	; a28 <free+0xa0>
+static Header base;
+static Header *freep;
+
+void
+free(void *ap)
+{
+ 98c:	e92d0830 	push	{r4, r5, fp}
+  Header *bp, *p;
+
+  bp = (Header*)ap - 1;
+ 990:	e240c008 	sub	ip, r0, #8
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+ 994:	e5932000 	ldr	r2, [r3]
+static Header base;
+static Header *freep;
+
+void
+free(void *ap)
+{
+ 998:	e28db008 	add	fp, sp, #8
+  Header *bp, *p;
+
+  bp = (Header*)ap - 1;
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+ 99c:	e152000c 	cmp	r2, ip
+ 9a0:	e5921000 	ldr	r1, [r2]
+ 9a4:	2a000001 	bcs	9b0 <free+0x28>
+ 9a8:	e15c0001 	cmp	ip, r1
+ 9ac:	3a000007 	bcc	9d0 <free+0x48>
+    if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
+ 9b0:	e1520001 	cmp	r2, r1
+ 9b4:	3a000003 	bcc	9c8 <free+0x40>
+ 9b8:	e152000c 	cmp	r2, ip
+ 9bc:	3a000003 	bcc	9d0 <free+0x48>
+ 9c0:	e15c0001 	cmp	ip, r1
+ 9c4:	3a000001 	bcc	9d0 <free+0x48>
+static Header base;
+static Header *freep;
+
+void
+free(void *ap)
+{
+ 9c8:	e1a02001 	mov	r2, r1
+ 9cc:	eafffff2 	b	99c <free+0x14>
+
+  bp = (Header*)ap - 1;
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+    if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
+      break;
+  if(bp + bp->s.size == p->s.ptr){
+ 9d0:	e5104004 	ldr	r4, [r0, #-4]
+  if(p + p->s.size == bp){
+    p->s.size += bp->s.size;
+    p->s.ptr = bp->s.ptr;
+  } else
+    p->s.ptr = bp;
+  freep = p;
+ 9d4:	e5832000 	str	r2, [r3]
+
+  bp = (Header*)ap - 1;
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+    if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
+      break;
+  if(bp + bp->s.size == p->s.ptr){
+ 9d8:	e08c5184 	add	r5, ip, r4, lsl #3
+ 9dc:	e1550001 	cmp	r5, r1
+    bp->s.size += p->s.ptr->s.size;
+ 9e0:	05911004 	ldreq	r1, [r1, #4]
+ 9e4:	00814004 	addeq	r4, r1, r4
+ 9e8:	05004004 	streq	r4, [r0, #-4]
+    bp->s.ptr = p->s.ptr->s.ptr;
+ 9ec:	05921000 	ldreq	r1, [r2]
+ 9f0:	05911000 	ldreq	r1, [r1]
+  } else
+    bp->s.ptr = p->s.ptr;
+ 9f4:	e5001008 	str	r1, [r0, #-8]
+  if(p + p->s.size == bp){
+ 9f8:	e5921004 	ldr	r1, [r2, #4]
+ 9fc:	e0824181 	add	r4, r2, r1, lsl #3
+ a00:	e15c0004 	cmp	ip, r4
+    p->s.size += bp->s.size;
+    p->s.ptr = bp->s.ptr;
+  } else
+    p->s.ptr = bp;
+ a04:	1582c000 	strne	ip, [r2]
+    bp->s.size += p->s.ptr->s.size;
+    bp->s.ptr = p->s.ptr->s.ptr;
+  } else
+    bp->s.ptr = p->s.ptr;
+  if(p + p->s.size == bp){
+    p->s.size += bp->s.size;
+ a08:	0510c004 	ldreq	ip, [r0, #-4]
+ a0c:	008c1001 	addeq	r1, ip, r1
+ a10:	05821004 	streq	r1, [r2, #4]
+    p->s.ptr = bp->s.ptr;
+ a14:	05101008 	ldreq	r1, [r0, #-8]
+ a18:	05821000 	streq	r1, [r2]
+  } else
+    p->s.ptr = bp;
+  freep = p;
+}
+ a1c:	e24bd008 	sub	sp, fp, #8
+ a20:	e8bd0830 	pop	{r4, r5, fp}
+ a24:	e12fff1e 	bx	lr
+ a28:	00000b54 	.word	0x00000b54
+
+00000a2c <malloc>:
+  return freep;
+}
+
+void*
+malloc(uint nbytes)
+{
+ a2c:	e92d49f8 	push	{r3, r4, r5, r6, r7, r8, fp, lr}
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+ a30:	e2804007 	add	r4, r0, #7
+  if((prevp = freep) == 0){
+ a34:	e59f50d4 	ldr	r5, [pc, #212]	; b10 <malloc+0xe4>
+malloc(uint nbytes)
+{
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+ a38:	e1a041a4 	lsr	r4, r4, #3
+  return freep;
+}
+
+void*
+malloc(uint nbytes)
+{
+ a3c:	e28db01c 	add	fp, sp, #28
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+  if((prevp = freep) == 0){
+ a40:	e5953000 	ldr	r3, [r5]
+malloc(uint nbytes)
+{
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+ a44:	e2844001 	add	r4, r4, #1
+  if((prevp = freep) == 0){
+ a48:	e3530000 	cmp	r3, #0
+ a4c:	0a00002b 	beq	b00 <malloc+0xd4>
+ a50:	e5930000 	ldr	r0, [r3]
+ a54:	e5902004 	ldr	r2, [r0, #4]
+    base.s.ptr = freep = prevp = &base;
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+    if(p->s.size >= nunits){
+ a58:	e1520004 	cmp	r2, r4
+ a5c:	2a00001b 	bcs	ad0 <malloc+0xa4>
+morecore(uint nu)
+{
+  char *p;
+  Header *hp;
+
+  if(nu < 4096)
+ a60:	e59f80ac 	ldr	r8, [pc, #172]	; b14 <malloc+0xe8>
+        p->s.size -= nunits;
+        p += p->s.size;
+        p->s.size = nunits;
+      }
+      freep = prevp;
+      return (void*)(p + 1);
+ a64:	e1a07184 	lsl	r7, r4, #3
+ a68:	ea000003 	b	a7c <malloc+0x50>
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+  if((prevp = freep) == 0){
+    base.s.ptr = freep = prevp = &base;
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+ a6c:	e5930000 	ldr	r0, [r3]
+    if(p->s.size >= nunits){
+ a70:	e5902004 	ldr	r2, [r0, #4]
+ a74:	e1540002 	cmp	r4, r2
+ a78:	9a000014 	bls	ad0 <malloc+0xa4>
+        p->s.size = nunits;
+      }
+      freep = prevp;
+      return (void*)(p + 1);
+    }
+    if(p == freep)
+ a7c:	e5952000 	ldr	r2, [r5]
+ a80:	e1a03000 	mov	r3, r0
+ a84:	e1500002 	cmp	r0, r2
+ a88:	1afffff7 	bne	a6c <malloc+0x40>
+morecore(uint nu)
+{
+  char *p;
+  Header *hp;
+
+  if(nu < 4096)
+ a8c:	e1540008 	cmp	r4, r8
+    nu = 4096;
+  p = sbrk(nu * sizeof(Header));
+ a90:	81a00007 	movhi	r0, r7
+ a94:	93a00902 	movls	r0, #32768	; 0x8000
+morecore(uint nu)
+{
+  char *p;
+  Header *hp;
+
+  if(nu < 4096)
+ a98:	81a06004 	movhi	r6, r4
+ a9c:	93a06a01 	movls	r6, #4096	; 0x1000
+    nu = 4096;
+  p = sbrk(nu * sizeof(Header));
+ aa0:	ebfffeec 	bl	658 <sbrk>
+ aa4:	e1a03000 	mov	r3, r0
+  if(p == (char*)-1)
+ aa8:	e3730001 	cmn	r3, #1
+    return 0;
+  hp = (Header*)p;
+  hp->s.size = nu;
+  free((void*)(hp + 1));
+ aac:	e2800008 	add	r0, r0, #8
+  Header *hp;
+
+  if(nu < 4096)
+    nu = 4096;
+  p = sbrk(nu * sizeof(Header));
+  if(p == (char*)-1)
+ ab0:	0a000010 	beq	af8 <malloc+0xcc>
+    return 0;
+  hp = (Header*)p;
+  hp->s.size = nu;
+ ab4:	e5836004 	str	r6, [r3, #4]
+  free((void*)(hp + 1));
+ ab8:	ebffffb2 	bl	988 <free>
+  return freep;
+ abc:	e5953000 	ldr	r3, [r5]
+      }
+      freep = prevp;
+      return (void*)(p + 1);
+    }
+    if(p == freep)
+      if((p = morecore(nunits)) == 0)
+ ac0:	e3530000 	cmp	r3, #0
+ ac4:	1affffe8 	bne	a6c <malloc+0x40>
+        return 0;
+ ac8:	e1a00003 	mov	r0, r3
+  }
+}
+ acc:	e8bd89f8 	pop	{r3, r4, r5, r6, r7, r8, fp, pc}
+    base.s.ptr = freep = prevp = &base;
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+    if(p->s.size >= nunits){
+      if(p->s.size == nunits)
+ ad0:	e1540002 	cmp	r4, r2
+        prevp->s.ptr = p->s.ptr;
+      else {
+        p->s.size -= nunits;
+ ad4:	10642002 	rsbne	r2, r4, r2
+ ad8:	15802004 	strne	r2, [r0, #4]
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+    if(p->s.size >= nunits){
+      if(p->s.size == nunits)
+        prevp->s.ptr = p->s.ptr;
+ adc:	05902000 	ldreq	r2, [r0]
+      else {
+        p->s.size -= nunits;
+        p += p->s.size;
+ ae0:	10800182 	addne	r0, r0, r2, lsl #3
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+    if(p->s.size >= nunits){
+      if(p->s.size == nunits)
+        prevp->s.ptr = p->s.ptr;
+ ae4:	05832000 	streq	r2, [r3]
+      else {
+        p->s.size -= nunits;
+        p += p->s.size;
+        p->s.size = nunits;
+ ae8:	15804004 	strne	r4, [r0, #4]
+      }
+      freep = prevp;
+ aec:	e5853000 	str	r3, [r5]
+      return (void*)(p + 1);
+ af0:	e2800008 	add	r0, r0, #8
+ af4:	e8bd89f8 	pop	{r3, r4, r5, r6, r7, r8, fp, pc}
+    }
+    if(p == freep)
+      if((p = morecore(nunits)) == 0)
+        return 0;
+ af8:	e3a00000 	mov	r0, #0
+ afc:	e8bd89f8 	pop	{r3, r4, r5, r6, r7, r8, fp, pc}
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+  if((prevp = freep) == 0){
+    base.s.ptr = freep = prevp = &base;
+ b00:	e2850004 	add	r0, r5, #4
+ b04:	e5850000 	str	r0, [r5]
+    base.s.size = 0;
+ b08:	e9850009 	stmib	r5, {r0, r3}
+ b0c:	eaffffd3 	b	a60 <malloc+0x34>
+ b10:	00000b54 	.word	0x00000b54
+ b14:	00000fff 	.word	0x00000fff