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comparison uprogs/ls.asm @ 0:c450faca55f4

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author Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
date Sun, 22 Oct 2017 18:25:39 +0900
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-1:000000000000 0:c450faca55f4
1
2 _ls: file format elf32-littlearm
3
4
5 Disassembly of section .text:
6
7 00000000 <main>:
8 int
9 main(int argc, char *argv[])
10 {
11 int i;
12
13 if(argc < 2){
14 0: e3500001 cmp r0, #1
15 close(fd);
16 }
17
18 int
19 main(int argc, char *argv[])
20 {
21 4: e92d4878 push {r3, r4, r5, r6, fp, lr}
22 8: e1a04000 mov r4, r0
23 c: e28db014 add fp, sp, #20
24 int i;
25
26 if(argc < 2){
27 ls(".");
28 exit();
29 10: c1a06001 movgt r6, r1
30 int
31 main(int argc, char *argv[])
32 {
33 int i;
34
35 if(argc < 2){
36 14: c3a05001 movgt r5, #1
37 18: da000005 ble 34 <main+0x34>
38 ls(".");
39 exit();
40 }
41 for(i=1; i<argc; i++)
42 ls(argv[i]);
43 1c: e5b60004 ldr r0, [r6, #4]!
44
45 if(argc < 2){
46 ls(".");
47 exit();
48 }
49 for(i=1; i<argc; i++)
50 20: e2855001 add r5, r5, #1
51 ls(argv[i]);
52 24: eb000030 bl ec <ls>
53
54 if(argc < 2){
55 ls(".");
56 exit();
57 }
58 for(i=1; i<argc; i++)
59 28: e1550004 cmp r5, r4
60 2c: 1afffffa bne 1c <main+0x1c>
61 ls(argv[i]);
62 exit();
63 30: eb00013e bl 530 <exit>
64 main(int argc, char *argv[])
65 {
66 int i;
67
68 if(argc < 2){
69 ls(".");
70 34: e59f0004 ldr r0, [pc, #4] ; 40 <main+0x40>
71 38: eb00002b bl ec <ls>
72 exit();
73 3c: eb00013b bl 530 <exit>
74 40: 00000db0 .word 0x00000db0
75
76 00000044 <fmtname>:
77 #include "user.h"
78 #include "fs.h"
79
80 char*
81 fmtname(char *path)
82 {
83 44: e92d4878 push {r3, r4, r5, r6, fp, lr}
84 48: e28db014 add fp, sp, #20
85 4c: e1a05000 mov r5, r0
86 static char buf[DIRSIZ+1];
87 char *p;
88
89 // Find first character after last slash.
90 for(p=path+strlen(path); p >= path && *p != '/'; p--)
91 50: eb0000ab bl 304 <strlen>
92 54: e0954000 adds r4, r5, r0
93 58: 2a00000a bcs 88 <fmtname+0x44>
94 5c: e7d53000 ldrb r3, [r5, r0]
95 60: e353002f cmp r3, #47 ; 0x2f
96 64: 0a000007 beq 88 <fmtname+0x44>
97 68: e1a03004 mov r3, r4
98 6c: ea000002 b 7c <fmtname+0x38>
99 70: e5732001 ldrb r2, [r3, #-1]!
100 74: e352002f cmp r2, #47 ; 0x2f
101 78: 0a000002 beq 88 <fmtname+0x44>
102 7c: e2444001 sub r4, r4, #1
103 80: e1550004 cmp r5, r4
104 84: 9afffff9 bls 70 <fmtname+0x2c>
105 ;
106 p++;
107 88: e2844001 add r4, r4, #1
108
109 // Return blank-padded name.
110 if(strlen(p) >= DIRSIZ)
111 8c: e1a00004 mov r0, r4
112 90: eb00009b bl 304 <strlen>
113 94: e350000d cmp r0, #13
114 98: 8a000010 bhi e0 <fmtname+0x9c>
115 return p;
116 memmove(buf, p, strlen(p));
117 9c: e1a00004 mov r0, r4
118 a0: eb000097 bl 304 <strlen>
119 a4: e59f503c ldr r5, [pc, #60] ; e8 <fmtname+0xa4>
120 a8: e1a01004 mov r1, r4
121 ac: e1a02000 mov r2, r0
122 b0: e1a00005 mov r0, r5
123 b4: eb000103 bl 4c8 <memmove>
124 memset(buf+strlen(p), ' ', DIRSIZ-strlen(p));
125 b8: e1a00004 mov r0, r4
126 bc: eb000090 bl 304 <strlen>
127 c0: e1a06000 mov r6, r0
128 c4: e1a00004 mov r0, r4
129 c8: eb00008d bl 304 <strlen>
130 cc: e3a01020 mov r1, #32
131 return buf;
132 d0: e1a04005 mov r4, r5
133
134 // Return blank-padded name.
135 if(strlen(p) >= DIRSIZ)
136 return p;
137 memmove(buf, p, strlen(p));
138 memset(buf+strlen(p), ' ', DIRSIZ-strlen(p));
139 d4: e260200e rsb r2, r0, #14
140 d8: e0850006 add r0, r5, r6
141 dc: eb000098 bl 344 <memset>
142 return buf;
143 }
144 e0: e1a00004 mov r0, r4
145 e4: e8bd8878 pop {r3, r4, r5, r6, fp, pc}
146 e8: 00000dd0 .word 0x00000dd0
147
148 000000ec <ls>:
149
150 void
151 ls(char *path)
152 {
153 ec: e92d49f0 push {r4, r5, r6, r7, r8, fp, lr}
154 f0: e28db018 add fp, sp, #24
155 f4: e24ddf8d sub sp, sp, #564 ; 0x234
156 char buf[512], *p;
157 int fd;
158 struct dirent de;
159 struct stat st;
160
161 if((fd = open(path, 0)) < 0){
162 f8: e3a01000 mov r1, #0
163 return buf;
164 }
165
166 void
167 ls(char *path)
168 {
169 fc: e1a06000 mov r6, r0
170 char buf[512], *p;
171 int fd;
172 struct dirent de;
173 struct stat st;
174
175 if((fd = open(path, 0)) < 0){
176 100: eb000172 bl 6d0 <open>
177 104: e2504000 subs r4, r0, #0
178 108: ba00004b blt 23c <ls+0x150>
179 printf(2, "ls: cannot open %s\n", path);
180 return;
181 }
182
183 if(fstat(fd, &st) < 0){
184 10c: e24b1040 sub r1, fp, #64 ; 0x40
185 110: eb000195 bl 76c <fstat>
186 114: e3500000 cmp r0, #0
187 118: ba000051 blt 264 <ls+0x178>
188 printf(2, "ls: cannot stat %s\n", path);
189 close(fd);
190 return;
191 }
192
193 switch(st.type){
194 11c: e15b54f0 ldrsh r5, [fp, #-64] ; 0xffffffc0
195 120: e3550001 cmp r5, #1
196 124: 0a000011 beq 170 <ls+0x84>
197 128: e3550002 cmp r5, #2
198 12c: 0a000003 beq 140 <ls+0x54>
199 }
200 printf(1, "%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
201 }
202 break;
203 }
204 close(fd);
205 130: e1a00004 mov r0, r4
206 134: eb00013e bl 634 <close>
207 }
208 138: e24bd018 sub sp, fp, #24
209 13c: e8bd89f0 pop {r4, r5, r6, r7, r8, fp, pc}
210 return;
211 }
212
213 switch(st.type){
214 case T_FILE:
215 printf(1, "%s %d %d %d\n", fmtname(path), st.type, st.ino, st.size);
216 140: e1a00006 mov r0, r6
217 144: ebffffbe bl 44 <fmtname>
218 148: e51bc038 ldr ip, [fp, #-56] ; 0x38
219 14c: e15b34f0 ldrsh r3, [fp, #-64] ; 0xffffffc0
220 150: e58dc000 str ip, [sp]
221 154: e51bc030 ldr ip, [fp, #-48] ; 0x30
222 158: e59f1120 ldr r1, [pc, #288] ; 280 <ls+0x194>
223 15c: e58dc004 str ip, [sp, #4]
224 160: e1a02000 mov r2, r0
225 164: e3a00001 mov r0, #1
226 168: eb000243 bl a7c <printf>
227 break;
228 16c: eaffffef b 130 <ls+0x44>
229
230 case T_DIR:
231 if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
232 170: e1a00006 mov r0, r6
233 174: eb000062 bl 304 <strlen>
234 178: e2800010 add r0, r0, #16
235 17c: e3500c02 cmp r0, #512 ; 0x200
236 180: 8a000029 bhi 22c <ls+0x140>
237 printf(1, "ls: path too long\n");
238 break;
239 }
240 strcpy(buf, path);
241 184: e24b5d09 sub r5, fp, #576 ; 0x240
242 188: e1a01006 mov r1, r6
243 18c: e1a00005 mov r0, r5
244 190: eb00003e bl 290 <strcpy>
245 p = buf+strlen(buf);
246 194: e1a00005 mov r0, r5
247 198: eb000059 bl 304 <strlen>
248 *p++ = '/';
249 while(read(fd, &de, sizeof(de)) == sizeof(de)){
250 if(de.inum == 0)
251 continue;
252 memmove(p, de.name, DIRSIZ);
253 p[DIRSIZ] = 0;
254 19c: e3a08000 mov r8, #0
255 printf(1, "ls: path too long\n");
256 break;
257 }
258 strcpy(buf, path);
259 p = buf+strlen(buf);
260 *p++ = '/';
261 1a0: e3a0302f mov r3, #47 ; 0x2f
262 if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
263 printf(1, "ls: path too long\n");
264 break;
265 }
266 strcpy(buf, path);
267 p = buf+strlen(buf);
268 1a4: e0856000 add r6, r5, r0
269 *p++ = '/';
270 1a8: e2867001 add r7, r6, #1
271 1ac: e7c53000 strb r3, [r5, r0]
272 while(read(fd, &de, sizeof(de)) == sizeof(de)){
273 1b0: e24b102c sub r1, fp, #44 ; 0x2c
274 1b4: e1a00004 mov r0, r4
275 1b8: e3a02010 mov r2, #16
276 1bc: eb000102 bl 5cc <read>
277 1c0: e3500010 cmp r0, #16
278 1c4: 1affffd9 bne 130 <ls+0x44>
279 if(de.inum == 0)
280 1c8: e15b32bc ldrh r3, [fp, #-44] ; 0xffffffd4
281 1cc: e3530000 cmp r3, #0
282 1d0: 0afffff6 beq 1b0 <ls+0xc4>
283 continue;
284 memmove(p, de.name, DIRSIZ);
285 1d4: e3a0200e mov r2, #14
286 1d8: e24b102a sub r1, fp, #42 ; 0x2a
287 1dc: e1a00007 mov r0, r7
288 1e0: eb0000b8 bl 4c8 <memmove>
289 p[DIRSIZ] = 0;
290 if(stat(buf, &st) < 0){
291 1e4: e24b1040 sub r1, fp, #64 ; 0x40
292 1e8: e1a00005 mov r0, r5
293 *p++ = '/';
294 while(read(fd, &de, sizeof(de)) == sizeof(de)){
295 if(de.inum == 0)
296 continue;
297 memmove(p, de.name, DIRSIZ);
298 p[DIRSIZ] = 0;
299 1ec: e5c6800f strb r8, [r6, #15]
300 if(stat(buf, &st) < 0){
301 1f0: eb000090 bl 438 <stat>
302 1f4: e3500000 cmp r0, #0
303 printf(1, "ls: cannot stat %s\n", buf);
304 continue;
305 }
306 printf(1, "%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
307 1f8: e1a00005 mov r0, r5
308 while(read(fd, &de, sizeof(de)) == sizeof(de)){
309 if(de.inum == 0)
310 continue;
311 memmove(p, de.name, DIRSIZ);
312 p[DIRSIZ] = 0;
313 if(stat(buf, &st) < 0){
314 1fc: ba000013 blt 250 <ls+0x164>
315 printf(1, "ls: cannot stat %s\n", buf);
316 continue;
317 }
318 printf(1, "%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
319 200: ebffff8f bl 44 <fmtname>
320 204: e51bc038 ldr ip, [fp, #-56] ; 0x38
321 208: e15b34f0 ldrsh r3, [fp, #-64] ; 0xffffffc0
322 20c: e58dc000 str ip, [sp]
323 210: e51bc030 ldr ip, [fp, #-48] ; 0x30
324 214: e59f1064 ldr r1, [pc, #100] ; 280 <ls+0x194>
325 218: e58dc004 str ip, [sp, #4]
326 21c: e1a02000 mov r2, r0
327 220: e3a00001 mov r0, #1
328 224: eb000214 bl a7c <printf>
329 228: eaffffe0 b 1b0 <ls+0xc4>
330 printf(1, "%s %d %d %d\n", fmtname(path), st.type, st.ino, st.size);
331 break;
332
333 case T_DIR:
334 if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
335 printf(1, "ls: path too long\n");
336 22c: e1a00005 mov r0, r5
337 230: e59f104c ldr r1, [pc, #76] ; 284 <ls+0x198>
338 234: eb000210 bl a7c <printf>
339 break;
340 238: eaffffbc b 130 <ls+0x44>
341 int fd;
342 struct dirent de;
343 struct stat st;
344
345 if((fd = open(path, 0)) < 0){
346 printf(2, "ls: cannot open %s\n", path);
347 23c: e3a00002 mov r0, #2
348 240: e59f1040 ldr r1, [pc, #64] ; 288 <ls+0x19c>
349 244: e1a02006 mov r2, r6
350 248: eb00020b bl a7c <printf>
351 return;
352 24c: eaffffb9 b 138 <ls+0x4c>
353 if(de.inum == 0)
354 continue;
355 memmove(p, de.name, DIRSIZ);
356 p[DIRSIZ] = 0;
357 if(stat(buf, &st) < 0){
358 printf(1, "ls: cannot stat %s\n", buf);
359 250: e3a00001 mov r0, #1
360 254: e59f1030 ldr r1, [pc, #48] ; 28c <ls+0x1a0>
361 258: e1a02005 mov r2, r5
362 25c: eb000206 bl a7c <printf>
363 continue;
364 260: eaffffd2 b 1b0 <ls+0xc4>
365 printf(2, "ls: cannot open %s\n", path);
366 return;
367 }
368
369 if(fstat(fd, &st) < 0){
370 printf(2, "ls: cannot stat %s\n", path);
371 264: e59f1020 ldr r1, [pc, #32] ; 28c <ls+0x1a0>
372 268: e1a02006 mov r2, r6
373 26c: e3a00002 mov r0, #2
374 270: eb000201 bl a7c <printf>
375 close(fd);
376 274: e1a00004 mov r0, r4
377 278: eb0000ed bl 634 <close>
378 return;
379 27c: eaffffad b 138 <ls+0x4c>
380 280: 00000d8c .word 0x00000d8c
381 284: 00000d9c .word 0x00000d9c
382 288: 00000d64 .word 0x00000d64
383 28c: 00000d78 .word 0x00000d78
384
385 00000290 <strcpy>:
386 #include "user.h"
387 #include "arm.h"
388
389 char*
390 strcpy(char *s, char *t)
391 {
392 290: e52db004 push {fp} ; (str fp, [sp, #-4]!)
393 char *os;
394
395 os = s;
396 while((*s++ = *t++) != 0)
397 294: e1a02000 mov r2, r0
398 #include "user.h"
399 #include "arm.h"
400
401 char*
402 strcpy(char *s, char *t)
403 {
404 298: e28db000 add fp, sp, #0
405 char *os;
406
407 os = s;
408 while((*s++ = *t++) != 0)
409 29c: e4d13001 ldrb r3, [r1], #1
410 2a0: e3530000 cmp r3, #0
411 2a4: e4c23001 strb r3, [r2], #1
412 2a8: 1afffffb bne 29c <strcpy+0xc>
413 ;
414 return os;
415 }
416 2ac: e28bd000 add sp, fp, #0
417 2b0: e8bd0800 pop {fp}
418 2b4: e12fff1e bx lr
419
420 000002b8 <strcmp>:
421
422 int
423 strcmp(const char *p, const char *q)
424 {
425 2b8: e52db004 push {fp} ; (str fp, [sp, #-4]!)
426 2bc: e28db000 add fp, sp, #0
427 while(*p && *p == *q)
428 2c0: e5d03000 ldrb r3, [r0]
429 2c4: e5d12000 ldrb r2, [r1]
430 2c8: e3530000 cmp r3, #0
431 2cc: 1a000004 bne 2e4 <strcmp+0x2c>
432 2d0: ea000005 b 2ec <strcmp+0x34>
433 2d4: e5f03001 ldrb r3, [r0, #1]!
434 2d8: e3530000 cmp r3, #0
435 2dc: 0a000006 beq 2fc <strcmp+0x44>
436 2e0: e5f12001 ldrb r2, [r1, #1]!
437 2e4: e1530002 cmp r3, r2
438 2e8: 0afffff9 beq 2d4 <strcmp+0x1c>
439 p++, q++;
440 return (uchar)*p - (uchar)*q;
441 }
442 2ec: e0620003 rsb r0, r2, r3
443 2f0: e28bd000 add sp, fp, #0
444 2f4: e8bd0800 pop {fp}
445 2f8: e12fff1e bx lr
446 }
447
448 int
449 strcmp(const char *p, const char *q)
450 {
451 while(*p && *p == *q)
452 2fc: e5d12001 ldrb r2, [r1, #1]
453 300: eafffff9 b 2ec <strcmp+0x34>
454
455 00000304 <strlen>:
456 return (uchar)*p - (uchar)*q;
457 }
458
459 uint
460 strlen(char *s)
461 {
462 304: e52db004 push {fp} ; (str fp, [sp, #-4]!)
463 308: e28db000 add fp, sp, #0
464 int n;
465
466 for(n = 0; s[n]; n++)
467 30c: e5d03000 ldrb r3, [r0]
468 310: e3530000 cmp r3, #0
469 314: 01a00003 moveq r0, r3
470 318: 0a000006 beq 338 <strlen+0x34>
471 31c: e1a02000 mov r2, r0
472 320: e3a03000 mov r3, #0
473 324: e5f21001 ldrb r1, [r2, #1]!
474 328: e2833001 add r3, r3, #1
475 32c: e1a00003 mov r0, r3
476 330: e3510000 cmp r1, #0
477 334: 1afffffa bne 324 <strlen+0x20>
478 ;
479 return n;
480 }
481 338: e28bd000 add sp, fp, #0
482 33c: e8bd0800 pop {fp}
483 340: e12fff1e bx lr
484
485 00000344 <memset>:
486 memset(void *dst, int c, uint n)
487 {
488 char *p=dst;
489 u32 rc=n;
490
491 while (rc-- > 0) *p++ = c;
492 344: e3520000 cmp r2, #0
493 return n;
494 }
495
496 void*
497 memset(void *dst, int c, uint n)
498 {
499 348: e52db004 push {fp} ; (str fp, [sp, #-4]!)
500 34c: e28db000 add fp, sp, #0
501 char *p=dst;
502 u32 rc=n;
503
504 while (rc-- > 0) *p++ = c;
505 350: 0a000006 beq 370 <memset+0x2c>
506 354: e6ef1071 uxtb r1, r1
507 358: e1a03002 mov r3, r2
508 }
509
510 void*
511 memset(void *dst, int c, uint n)
512 {
513 char *p=dst;
514 35c: e1a0c000 mov ip, r0
515 u32 rc=n;
516
517 while (rc-- > 0) *p++ = c;
518 360: e2533001 subs r3, r3, #1
519 364: e4cc1001 strb r1, [ip], #1
520 368: 1afffffc bne 360 <memset+0x1c>
521 36c: e0800002 add r0, r0, r2
522 return (void *)p;
523 }
524 370: e28bd000 add sp, fp, #0
525 374: e8bd0800 pop {fp}
526 378: e12fff1e bx lr
527
528 0000037c <strchr>:
529
530 char*
531 strchr(const char *s, char c)
532 {
533 37c: e52db004 push {fp} ; (str fp, [sp, #-4]!)
534 380: e28db000 add fp, sp, #0
535 for(; *s; s++)
536 384: e5d03000 ldrb r3, [r0]
537 388: e3530000 cmp r3, #0
538 38c: 1a000004 bne 3a4 <strchr+0x28>
539 390: ea000008 b 3b8 <strchr+0x3c>
540 394: e5d03001 ldrb r3, [r0, #1]
541 398: e2800001 add r0, r0, #1
542 39c: e3530000 cmp r3, #0
543 3a0: 0a000004 beq 3b8 <strchr+0x3c>
544 if(*s == c)
545 3a4: e1530001 cmp r3, r1
546 3a8: 1afffff9 bne 394 <strchr+0x18>
547 return (char*)s;
548 return 0;
549 }
550 3ac: e28bd000 add sp, fp, #0
551 3b0: e8bd0800 pop {fp}
552 3b4: e12fff1e bx lr
553 strchr(const char *s, char c)
554 {
555 for(; *s; s++)
556 if(*s == c)
557 return (char*)s;
558 return 0;
559 3b8: e1a00003 mov r0, r3
560 3bc: eafffffa b 3ac <strchr+0x30>
561
562 000003c0 <gets>:
563 }
564
565 char*
566 gets(char *buf, int max)
567 {
568 3c0: e92d49f0 push {r4, r5, r6, r7, r8, fp, lr}
569 3c4: e28db018 add fp, sp, #24
570 3c8: e24dd00c sub sp, sp, #12
571 3cc: e1a08000 mov r8, r0
572 3d0: e1a07001 mov r7, r1
573 int i, cc;
574 char c;
575
576 for(i=0; i+1 < max; ){
577 3d4: e1a06000 mov r6, r0
578 3d8: e3a05000 mov r5, #0
579 3dc: ea000008 b 404 <gets+0x44>
580 cc = read(0, &c, 1);
581 3e0: eb000079 bl 5cc <read>
582 if(cc < 1)
583 3e4: e3500000 cmp r0, #0
584 3e8: da00000b ble 41c <gets+0x5c>
585 break;
586 buf[i++] = c;
587 3ec: e55b301d ldrb r3, [fp, #-29]
588 if(c == '\n' || c == '\r')
589 3f0: e1a05004 mov r5, r4
590 3f4: e353000a cmp r3, #10
591 3f8: 1353000d cmpne r3, #13
592
593 for(i=0; i+1 < max; ){
594 cc = read(0, &c, 1);
595 if(cc < 1)
596 break;
597 buf[i++] = c;
598 3fc: e4c63001 strb r3, [r6], #1
599 if(c == '\n' || c == '\r')
600 400: 0a00000a beq 430 <gets+0x70>
601 {
602 int i, cc;
603 char c;
604
605 for(i=0; i+1 < max; ){
606 cc = read(0, &c, 1);
607 404: e3a02001 mov r2, #1
608 gets(char *buf, int max)
609 {
610 int i, cc;
611 char c;
612
613 for(i=0; i+1 < max; ){
614 408: e0854002 add r4, r5, r2
615 40c: e1540007 cmp r4, r7
616 cc = read(0, &c, 1);
617 410: e3a00000 mov r0, #0
618 414: e24b101d sub r1, fp, #29
619 gets(char *buf, int max)
620 {
621 int i, cc;
622 char c;
623
624 for(i=0; i+1 < max; ){
625 418: bafffff0 blt 3e0 <gets+0x20>
626 break;
627 buf[i++] = c;
628 if(c == '\n' || c == '\r')
629 break;
630 }
631 buf[i] = '\0';
632 41c: e3a03000 mov r3, #0
633 420: e7c83005 strb r3, [r8, r5]
634 return buf;
635 }
636 424: e1a00008 mov r0, r8
637 428: e24bd018 sub sp, fp, #24
638 42c: e8bd89f0 pop {r4, r5, r6, r7, r8, fp, pc}
639 gets(char *buf, int max)
640 {
641 int i, cc;
642 char c;
643
644 for(i=0; i+1 < max; ){
645 430: e1a05004 mov r5, r4
646 434: eafffff8 b 41c <gets+0x5c>
647
648 00000438 <stat>:
649 return buf;
650 }
651
652 int
653 stat(char *n, struct stat *st)
654 {
655 438: e92d4830 push {r4, r5, fp, lr}
656 43c: e1a05001 mov r5, r1
657 440: e28db00c add fp, sp, #12
658 int fd;
659 int r;
660
661 fd = open(n, O_RDONLY);
662 444: e3a01000 mov r1, #0
663 448: eb0000a0 bl 6d0 <open>
664 if(fd < 0)
665 44c: e2504000 subs r4, r0, #0
666 return -1;
667 450: b3e05000 mvnlt r5, #0
668 {
669 int fd;
670 int r;
671
672 fd = open(n, O_RDONLY);
673 if(fd < 0)
674 454: ba000004 blt 46c <stat+0x34>
675 return -1;
676 r = fstat(fd, st);
677 458: e1a01005 mov r1, r5
678 45c: eb0000c2 bl 76c <fstat>
679 460: e1a05000 mov r5, r0
680 close(fd);
681 464: e1a00004 mov r0, r4
682 468: eb000071 bl 634 <close>
683 return r;
684 }
685 46c: e1a00005 mov r0, r5
686 470: e8bd8830 pop {r4, r5, fp, pc}
687
688 00000474 <atoi>:
689
690 int
691 atoi(const char *s)
692 {
693 474: e52db004 push {fp} ; (str fp, [sp, #-4]!)
694 478: e28db000 add fp, sp, #0
695 int n;
696
697 n = 0;
698 while('0' <= *s && *s <= '9')
699 47c: e5d03000 ldrb r3, [r0]
700 480: e2432030 sub r2, r3, #48 ; 0x30
701 484: e6ef2072 uxtb r2, r2
702 488: e3520009 cmp r2, #9
703 int
704 atoi(const char *s)
705 {
706 int n;
707
708 n = 0;
709 48c: 83a00000 movhi r0, #0
710 while('0' <= *s && *s <= '9')
711 490: 8a000009 bhi 4bc <atoi+0x48>
712 494: e1a02000 mov r2, r0
713 int
714 atoi(const char *s)
715 {
716 int n;
717
718 n = 0;
719 498: e3a00000 mov r0, #0
720 while('0' <= *s && *s <= '9')
721 n = n*10 + *s++ - '0';
722 49c: e0800100 add r0, r0, r0, lsl #2
723 4a0: e0830080 add r0, r3, r0, lsl #1
724 atoi(const char *s)
725 {
726 int n;
727
728 n = 0;
729 while('0' <= *s && *s <= '9')
730 4a4: e5f23001 ldrb r3, [r2, #1]!
731 n = n*10 + *s++ - '0';
732 4a8: e2400030 sub r0, r0, #48 ; 0x30
733 atoi(const char *s)
734 {
735 int n;
736
737 n = 0;
738 while('0' <= *s && *s <= '9')
739 4ac: e2431030 sub r1, r3, #48 ; 0x30
740 4b0: e6ef1071 uxtb r1, r1
741 4b4: e3510009 cmp r1, #9
742 4b8: 9afffff7 bls 49c <atoi+0x28>
743 n = n*10 + *s++ - '0';
744 return n;
745 }
746 4bc: e28bd000 add sp, fp, #0
747 4c0: e8bd0800 pop {fp}
748 4c4: e12fff1e bx lr
749
750 000004c8 <memmove>:
751 {
752 char *dst, *src;
753
754 dst = vdst;
755 src = vsrc;
756 while(n-- > 0)
757 4c8: e3520000 cmp r2, #0
758 return n;
759 }
760
761 void*
762 memmove(void *vdst, void *vsrc, int n)
763 {
764 4cc: e52db004 push {fp} ; (str fp, [sp, #-4]!)
765 4d0: e28db000 add fp, sp, #0
766 char *dst, *src;
767
768 dst = vdst;
769 src = vsrc;
770 while(n-- > 0)
771 4d4: da000005 ble 4f0 <memmove+0x28>
772 n = n*10 + *s++ - '0';
773 return n;
774 }
775
776 void*
777 memmove(void *vdst, void *vsrc, int n)
778 4d8: e0802002 add r2, r0, r2
779 {
780 char *dst, *src;
781
782 dst = vdst;
783 4dc: e1a03000 mov r3, r0
784 src = vsrc;
785 while(n-- > 0)
786 *dst++ = *src++;
787 4e0: e4d1c001 ldrb ip, [r1], #1
788 4e4: e4c3c001 strb ip, [r3], #1
789 {
790 char *dst, *src;
791
792 dst = vdst;
793 src = vsrc;
794 while(n-- > 0)
795 4e8: e1530002 cmp r3, r2
796 4ec: 1afffffb bne 4e0 <memmove+0x18>
797 *dst++ = *src++;
798 return vdst;
799 }
800 4f0: e28bd000 add sp, fp, #0
801 4f4: e8bd0800 pop {fp}
802 4f8: e12fff1e bx lr
803
804 000004fc <fork>:
805 4fc: e92d4000 push {lr}
806 500: e92d0008 push {r3}
807 504: e92d0004 push {r2}
808 508: e92d0002 push {r1}
809 50c: e92d0001 push {r0}
810 510: e3a00001 mov r0, #1
811 514: ef000040 svc 0x00000040
812 518: e8bd0002 pop {r1}
813 51c: e8bd0002 pop {r1}
814 520: e8bd0004 pop {r2}
815 524: e8bd0008 pop {r3}
816 528: e8bd4000 pop {lr}
817 52c: e12fff1e bx lr
818
819 00000530 <exit>:
820 530: e92d4000 push {lr}
821 534: e92d0008 push {r3}
822 538: e92d0004 push {r2}
823 53c: e92d0002 push {r1}
824 540: e92d0001 push {r0}
825 544: e3a00002 mov r0, #2
826 548: ef000040 svc 0x00000040
827 54c: e8bd0002 pop {r1}
828 550: e8bd0002 pop {r1}
829 554: e8bd0004 pop {r2}
830 558: e8bd0008 pop {r3}
831 55c: e8bd4000 pop {lr}
832 560: e12fff1e bx lr
833
834 00000564 <wait>:
835 564: e92d4000 push {lr}
836 568: e92d0008 push {r3}
837 56c: e92d0004 push {r2}
838 570: e92d0002 push {r1}
839 574: e92d0001 push {r0}
840 578: e3a00003 mov r0, #3
841 57c: ef000040 svc 0x00000040
842 580: e8bd0002 pop {r1}
843 584: e8bd0002 pop {r1}
844 588: e8bd0004 pop {r2}
845 58c: e8bd0008 pop {r3}
846 590: e8bd4000 pop {lr}
847 594: e12fff1e bx lr
848
849 00000598 <pipe>:
850 598: e92d4000 push {lr}
851 59c: e92d0008 push {r3}
852 5a0: e92d0004 push {r2}
853 5a4: e92d0002 push {r1}
854 5a8: e92d0001 push {r0}
855 5ac: e3a00004 mov r0, #4
856 5b0: ef000040 svc 0x00000040
857 5b4: e8bd0002 pop {r1}
858 5b8: e8bd0002 pop {r1}
859 5bc: e8bd0004 pop {r2}
860 5c0: e8bd0008 pop {r3}
861 5c4: e8bd4000 pop {lr}
862 5c8: e12fff1e bx lr
863
864 000005cc <read>:
865 5cc: e92d4000 push {lr}
866 5d0: e92d0008 push {r3}
867 5d4: e92d0004 push {r2}
868 5d8: e92d0002 push {r1}
869 5dc: e92d0001 push {r0}
870 5e0: e3a00005 mov r0, #5
871 5e4: ef000040 svc 0x00000040
872 5e8: e8bd0002 pop {r1}
873 5ec: e8bd0002 pop {r1}
874 5f0: e8bd0004 pop {r2}
875 5f4: e8bd0008 pop {r3}
876 5f8: e8bd4000 pop {lr}
877 5fc: e12fff1e bx lr
878
879 00000600 <write>:
880 600: e92d4000 push {lr}
881 604: e92d0008 push {r3}
882 608: e92d0004 push {r2}
883 60c: e92d0002 push {r1}
884 610: e92d0001 push {r0}
885 614: e3a00010 mov r0, #16
886 618: ef000040 svc 0x00000040
887 61c: e8bd0002 pop {r1}
888 620: e8bd0002 pop {r1}
889 624: e8bd0004 pop {r2}
890 628: e8bd0008 pop {r3}
891 62c: e8bd4000 pop {lr}
892 630: e12fff1e bx lr
893
894 00000634 <close>:
895 634: e92d4000 push {lr}
896 638: e92d0008 push {r3}
897 63c: e92d0004 push {r2}
898 640: e92d0002 push {r1}
899 644: e92d0001 push {r0}
900 648: e3a00015 mov r0, #21
901 64c: ef000040 svc 0x00000040
902 650: e8bd0002 pop {r1}
903 654: e8bd0002 pop {r1}
904 658: e8bd0004 pop {r2}
905 65c: e8bd0008 pop {r3}
906 660: e8bd4000 pop {lr}
907 664: e12fff1e bx lr
908
909 00000668 <kill>:
910 668: e92d4000 push {lr}
911 66c: e92d0008 push {r3}
912 670: e92d0004 push {r2}
913 674: e92d0002 push {r1}
914 678: e92d0001 push {r0}
915 67c: e3a00006 mov r0, #6
916 680: ef000040 svc 0x00000040
917 684: e8bd0002 pop {r1}
918 688: e8bd0002 pop {r1}
919 68c: e8bd0004 pop {r2}
920 690: e8bd0008 pop {r3}
921 694: e8bd4000 pop {lr}
922 698: e12fff1e bx lr
923
924 0000069c <exec>:
925 69c: e92d4000 push {lr}
926 6a0: e92d0008 push {r3}
927 6a4: e92d0004 push {r2}
928 6a8: e92d0002 push {r1}
929 6ac: e92d0001 push {r0}
930 6b0: e3a00007 mov r0, #7
931 6b4: ef000040 svc 0x00000040
932 6b8: e8bd0002 pop {r1}
933 6bc: e8bd0002 pop {r1}
934 6c0: e8bd0004 pop {r2}
935 6c4: e8bd0008 pop {r3}
936 6c8: e8bd4000 pop {lr}
937 6cc: e12fff1e bx lr
938
939 000006d0 <open>:
940 6d0: e92d4000 push {lr}
941 6d4: e92d0008 push {r3}
942 6d8: e92d0004 push {r2}
943 6dc: e92d0002 push {r1}
944 6e0: e92d0001 push {r0}
945 6e4: e3a0000f mov r0, #15
946 6e8: ef000040 svc 0x00000040
947 6ec: e8bd0002 pop {r1}
948 6f0: e8bd0002 pop {r1}
949 6f4: e8bd0004 pop {r2}
950 6f8: e8bd0008 pop {r3}
951 6fc: e8bd4000 pop {lr}
952 700: e12fff1e bx lr
953
954 00000704 <mknod>:
955 704: e92d4000 push {lr}
956 708: e92d0008 push {r3}
957 70c: e92d0004 push {r2}
958 710: e92d0002 push {r1}
959 714: e92d0001 push {r0}
960 718: e3a00011 mov r0, #17
961 71c: ef000040 svc 0x00000040
962 720: e8bd0002 pop {r1}
963 724: e8bd0002 pop {r1}
964 728: e8bd0004 pop {r2}
965 72c: e8bd0008 pop {r3}
966 730: e8bd4000 pop {lr}
967 734: e12fff1e bx lr
968
969 00000738 <unlink>:
970 738: e92d4000 push {lr}
971 73c: e92d0008 push {r3}
972 740: e92d0004 push {r2}
973 744: e92d0002 push {r1}
974 748: e92d0001 push {r0}
975 74c: e3a00012 mov r0, #18
976 750: ef000040 svc 0x00000040
977 754: e8bd0002 pop {r1}
978 758: e8bd0002 pop {r1}
979 75c: e8bd0004 pop {r2}
980 760: e8bd0008 pop {r3}
981 764: e8bd4000 pop {lr}
982 768: e12fff1e bx lr
983
984 0000076c <fstat>:
985 76c: e92d4000 push {lr}
986 770: e92d0008 push {r3}
987 774: e92d0004 push {r2}
988 778: e92d0002 push {r1}
989 77c: e92d0001 push {r0}
990 780: e3a00008 mov r0, #8
991 784: ef000040 svc 0x00000040
992 788: e8bd0002 pop {r1}
993 78c: e8bd0002 pop {r1}
994 790: e8bd0004 pop {r2}
995 794: e8bd0008 pop {r3}
996 798: e8bd4000 pop {lr}
997 79c: e12fff1e bx lr
998
999 000007a0 <link>:
1000 7a0: e92d4000 push {lr}
1001 7a4: e92d0008 push {r3}
1002 7a8: e92d0004 push {r2}
1003 7ac: e92d0002 push {r1}
1004 7b0: e92d0001 push {r0}
1005 7b4: e3a00013 mov r0, #19
1006 7b8: ef000040 svc 0x00000040
1007 7bc: e8bd0002 pop {r1}
1008 7c0: e8bd0002 pop {r1}
1009 7c4: e8bd0004 pop {r2}
1010 7c8: e8bd0008 pop {r3}
1011 7cc: e8bd4000 pop {lr}
1012 7d0: e12fff1e bx lr
1013
1014 000007d4 <mkdir>:
1015 7d4: e92d4000 push {lr}
1016 7d8: e92d0008 push {r3}
1017 7dc: e92d0004 push {r2}
1018 7e0: e92d0002 push {r1}
1019 7e4: e92d0001 push {r0}
1020 7e8: e3a00014 mov r0, #20
1021 7ec: ef000040 svc 0x00000040
1022 7f0: e8bd0002 pop {r1}
1023 7f4: e8bd0002 pop {r1}
1024 7f8: e8bd0004 pop {r2}
1025 7fc: e8bd0008 pop {r3}
1026 800: e8bd4000 pop {lr}
1027 804: e12fff1e bx lr
1028
1029 00000808 <chdir>:
1030 808: e92d4000 push {lr}
1031 80c: e92d0008 push {r3}
1032 810: e92d0004 push {r2}
1033 814: e92d0002 push {r1}
1034 818: e92d0001 push {r0}
1035 81c: e3a00009 mov r0, #9
1036 820: ef000040 svc 0x00000040
1037 824: e8bd0002 pop {r1}
1038 828: e8bd0002 pop {r1}
1039 82c: e8bd0004 pop {r2}
1040 830: e8bd0008 pop {r3}
1041 834: e8bd4000 pop {lr}
1042 838: e12fff1e bx lr
1043
1044 0000083c <dup>:
1045 83c: e92d4000 push {lr}
1046 840: e92d0008 push {r3}
1047 844: e92d0004 push {r2}
1048 848: e92d0002 push {r1}
1049 84c: e92d0001 push {r0}
1050 850: e3a0000a mov r0, #10
1051 854: ef000040 svc 0x00000040
1052 858: e8bd0002 pop {r1}
1053 85c: e8bd0002 pop {r1}
1054 860: e8bd0004 pop {r2}
1055 864: e8bd0008 pop {r3}
1056 868: e8bd4000 pop {lr}
1057 86c: e12fff1e bx lr
1058
1059 00000870 <getpid>:
1060 870: e92d4000 push {lr}
1061 874: e92d0008 push {r3}
1062 878: e92d0004 push {r2}
1063 87c: e92d0002 push {r1}
1064 880: e92d0001 push {r0}
1065 884: e3a0000b mov r0, #11
1066 888: ef000040 svc 0x00000040
1067 88c: e8bd0002 pop {r1}
1068 890: e8bd0002 pop {r1}
1069 894: e8bd0004 pop {r2}
1070 898: e8bd0008 pop {r3}
1071 89c: e8bd4000 pop {lr}
1072 8a0: e12fff1e bx lr
1073
1074 000008a4 <sbrk>:
1075 8a4: e92d4000 push {lr}
1076 8a8: e92d0008 push {r3}
1077 8ac: e92d0004 push {r2}
1078 8b0: e92d0002 push {r1}
1079 8b4: e92d0001 push {r0}
1080 8b8: e3a0000c mov r0, #12
1081 8bc: ef000040 svc 0x00000040
1082 8c0: e8bd0002 pop {r1}
1083 8c4: e8bd0002 pop {r1}
1084 8c8: e8bd0004 pop {r2}
1085 8cc: e8bd0008 pop {r3}
1086 8d0: e8bd4000 pop {lr}
1087 8d4: e12fff1e bx lr
1088
1089 000008d8 <sleep>:
1090 8d8: e92d4000 push {lr}
1091 8dc: e92d0008 push {r3}
1092 8e0: e92d0004 push {r2}
1093 8e4: e92d0002 push {r1}
1094 8e8: e92d0001 push {r0}
1095 8ec: e3a0000d mov r0, #13
1096 8f0: ef000040 svc 0x00000040
1097 8f4: e8bd0002 pop {r1}
1098 8f8: e8bd0002 pop {r1}
1099 8fc: e8bd0004 pop {r2}
1100 900: e8bd0008 pop {r3}
1101 904: e8bd4000 pop {lr}
1102 908: e12fff1e bx lr
1103
1104 0000090c <uptime>:
1105 90c: e92d4000 push {lr}
1106 910: e92d0008 push {r3}
1107 914: e92d0004 push {r2}
1108 918: e92d0002 push {r1}
1109 91c: e92d0001 push {r0}
1110 920: e3a0000e mov r0, #14
1111 924: ef000040 svc 0x00000040
1112 928: e8bd0002 pop {r1}
1113 92c: e8bd0002 pop {r1}
1114 930: e8bd0004 pop {r2}
1115 934: e8bd0008 pop {r3}
1116 938: e8bd4000 pop {lr}
1117 93c: e12fff1e bx lr
1118
1119 00000940 <putc>:
1120 #include "stat.h"
1121 #include "user.h"
1122
1123 static void
1124 putc(int fd, char c)
1125 {
1126 940: e92d4800 push {fp, lr}
1127 944: e28db004 add fp, sp, #4
1128 948: e24b3004 sub r3, fp, #4
1129 94c: e24dd008 sub sp, sp, #8
1130 write(fd, &c, 1);
1131 950: e3a02001 mov r2, #1
1132 #include "stat.h"
1133 #include "user.h"
1134
1135 static void
1136 putc(int fd, char c)
1137 {
1138 954: e5631001 strb r1, [r3, #-1]!
1139 write(fd, &c, 1);
1140 958: e1a01003 mov r1, r3
1141 95c: ebffff27 bl 600 <write>
1142 }
1143 960: e24bd004 sub sp, fp, #4
1144 964: e8bd8800 pop {fp, pc}
1145
1146 00000968 <printint>:
1147 return q;
1148 }
1149
1150 static void
1151 printint(int fd, int xx, int base, int sgn)
1152 {
1153 968: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
1154 96c: e1a04000 mov r4, r0
1155 char buf[16];
1156 int i, neg;
1157 uint x, y, b;
1158
1159 neg = 0;
1160 if(sgn && xx < 0){
1161 970: e1a00fa1 lsr r0, r1, #31
1162 974: e3530000 cmp r3, #0
1163 978: 03a03000 moveq r3, #0
1164 97c: 12003001 andne r3, r0, #1
1165 return q;
1166 }
1167
1168 static void
1169 printint(int fd, int xx, int base, int sgn)
1170 {
1171 980: e28db020 add fp, sp, #32
1172 char buf[16];
1173 int i, neg;
1174 uint x, y, b;
1175
1176 neg = 0;
1177 if(sgn && xx < 0){
1178 984: e3530000 cmp r3, #0
1179 return q;
1180 }
1181
1182 static void
1183 printint(int fd, int xx, int base, int sgn)
1184 {
1185 988: e24dd014 sub sp, sp, #20
1186 98c: e59f909c ldr r9, [pc, #156] ; a30 <printint+0xc8>
1187 uint x, y, b;
1188
1189 neg = 0;
1190 if(sgn && xx < 0){
1191 neg = 1;
1192 x = -xx;
1193 990: 12611000 rsbne r1, r1, #0
1194 int i, neg;
1195 uint x, y, b;
1196
1197 neg = 0;
1198 if(sgn && xx < 0){
1199 neg = 1;
1200 994: 13a03001 movne r3, #1
1201 } else {
1202 x = xx;
1203 }
1204
1205 b = base;
1206 i = 0;
1207 998: e3a0a000 mov sl, #0
1208 99c: e24b6034 sub r6, fp, #52 ; 0x34
1209 for(i=31;i>=0;i--){
1210 r = r << 1;
1211 r = r | ((n >> i) & 1);
1212 if(r >= d) {
1213 r = r - d;
1214 q = q | (1 << i);
1215 9a0: e3a08001 mov r8, #1
1216 write(fd, &c, 1);
1217 }
1218
1219 u32 div(u32 n, u32 d) // long division
1220 {
1221 u32 q=0, r=0;
1222 9a4: e3a07000 mov r7, #0
1223 int i;
1224
1225 for(i=31;i>=0;i--){
1226 9a8: e3a0001f mov r0, #31
1227 write(fd, &c, 1);
1228 }
1229
1230 u32 div(u32 n, u32 d) // long division
1231 {
1232 u32 q=0, r=0;
1233 9ac: e1a0c007 mov ip, r7
1234 int i;
1235
1236 for(i=31;i>=0;i--){
1237 r = r << 1;
1238 r = r | ((n >> i) & 1);
1239 9b0: e1a0e031 lsr lr, r1, r0
1240 9b4: e20ee001 and lr, lr, #1
1241 9b8: e18ec08c orr ip, lr, ip, lsl #1
1242 if(r >= d) {
1243 9bc: e152000c cmp r2, ip
1244 r = r - d;
1245 q = q | (1 << i);
1246 9c0: 91877018 orrls r7, r7, r8, lsl r0
1247
1248 for(i=31;i>=0;i--){
1249 r = r << 1;
1250 r = r | ((n >> i) & 1);
1251 if(r >= d) {
1252 r = r - d;
1253 9c4: 9062c00c rsbls ip, r2, ip
1254 u32 div(u32 n, u32 d) // long division
1255 {
1256 u32 q=0, r=0;
1257 int i;
1258
1259 for(i=31;i>=0;i--){
1260 9c8: e2500001 subs r0, r0, #1
1261 9cc: 2afffff7 bcs 9b0 <printint+0x48>
1262
1263 b = base;
1264 i = 0;
1265 do{
1266 y = div(x, b);
1267 buf[i++] = digits[x - y * b];
1268 9d0: e0000792 mul r0, r2, r7
1269 }while((x = y) != 0);
1270 9d4: e3570000 cmp r7, #0
1271
1272 b = base;
1273 i = 0;
1274 do{
1275 y = div(x, b);
1276 buf[i++] = digits[x - y * b];
1277 9d8: e0601001 rsb r1, r0, r1
1278 9dc: e28a5001 add r5, sl, #1
1279 9e0: e7d91001 ldrb r1, [r9, r1]
1280 9e4: e7c6100a strb r1, [r6, sl]
1281 }while((x = y) != 0);
1282 9e8: 11a01007 movne r1, r7
1283
1284 b = base;
1285 i = 0;
1286 do{
1287 y = div(x, b);
1288 buf[i++] = digits[x - y * b];
1289 9ec: 11a0a005 movne sl, r5
1290 9f0: 1affffeb bne 9a4 <printint+0x3c>
1291 }while((x = y) != 0);
1292 if(neg)
1293 9f4: e3530000 cmp r3, #0
1294 buf[i++] = '-';
1295 9f8: 124b2024 subne r2, fp, #36 ; 0x24
1296 9fc: 10823005 addne r3, r2, r5
1297 a00: 128a5002 addne r5, sl, #2
1298
1299 while(--i >= 0)
1300 a04: e2455001 sub r5, r5, #1
1301 do{
1302 y = div(x, b);
1303 buf[i++] = digits[x - y * b];
1304 }while((x = y) != 0);
1305 if(neg)
1306 buf[i++] = '-';
1307 a08: 13a0202d movne r2, #45 ; 0x2d
1308 a0c: 15432010 strbne r2, [r3, #-16]
1309
1310 while(--i >= 0)
1311 putc(fd, buf[i]);
1312 a10: e7d61005 ldrb r1, [r6, r5]
1313 a14: e1a00004 mov r0, r4
1314 buf[i++] = digits[x - y * b];
1315 }while((x = y) != 0);
1316 if(neg)
1317 buf[i++] = '-';
1318
1319 while(--i >= 0)
1320 a18: e2455001 sub r5, r5, #1
1321 putc(fd, buf[i]);
1322 a1c: ebffffc7 bl 940 <putc>
1323 buf[i++] = digits[x - y * b];
1324 }while((x = y) != 0);
1325 if(neg)
1326 buf[i++] = '-';
1327
1328 while(--i >= 0)
1329 a20: e3750001 cmn r5, #1
1330 a24: 1afffff9 bne a10 <printint+0xa8>
1331 putc(fd, buf[i]);
1332 }
1333 a28: e24bd020 sub sp, fp, #32
1334 a2c: e8bd8ff0 pop {r4, r5, r6, r7, r8, r9, sl, fp, pc}
1335 a30: 00000db4 .word 0x00000db4
1336
1337 00000a34 <div>:
1338 write(fd, &c, 1);
1339 }
1340
1341 u32 div(u32 n, u32 d) // long division
1342 {
1343 u32 q=0, r=0;
1344 a34: e3a03000 mov r3, #0
1345 {
1346 write(fd, &c, 1);
1347 }
1348
1349 u32 div(u32 n, u32 d) // long division
1350 {
1351 a38: e92d0830 push {r4, r5, fp}
1352 a3c: e1a02000 mov r2, r0
1353 a40: e28db008 add fp, sp, #8
1354 u32 q=0, r=0;
1355 int i;
1356
1357 for(i=31;i>=0;i--){
1358 a44: e3a0c01f mov ip, #31
1359 write(fd, &c, 1);
1360 }
1361
1362 u32 div(u32 n, u32 d) // long division
1363 {
1364 u32 q=0, r=0;
1365 a48: e1a00003 mov r0, r3
1366 for(i=31;i>=0;i--){
1367 r = r << 1;
1368 r = r | ((n >> i) & 1);
1369 if(r >= d) {
1370 r = r - d;
1371 q = q | (1 << i);
1372 a4c: e3a05001 mov r5, #1
1373 u32 q=0, r=0;
1374 int i;
1375
1376 for(i=31;i>=0;i--){
1377 r = r << 1;
1378 r = r | ((n >> i) & 1);
1379 a50: e1a04c32 lsr r4, r2, ip
1380 a54: e2044001 and r4, r4, #1
1381 a58: e1843083 orr r3, r4, r3, lsl #1
1382 if(r >= d) {
1383 a5c: e1530001 cmp r3, r1
1384 r = r - d;
1385 q = q | (1 << i);
1386 a60: 21800c15 orrcs r0, r0, r5, lsl ip
1387
1388 for(i=31;i>=0;i--){
1389 r = r << 1;
1390 r = r | ((n >> i) & 1);
1391 if(r >= d) {
1392 r = r - d;
1393 a64: 20613003 rsbcs r3, r1, r3
1394 u32 div(u32 n, u32 d) // long division
1395 {
1396 u32 q=0, r=0;
1397 int i;
1398
1399 for(i=31;i>=0;i--){
1400 a68: e25cc001 subs ip, ip, #1
1401 a6c: 2afffff7 bcs a50 <div+0x1c>
1402 r = r - d;
1403 q = q | (1 << i);
1404 }
1405 }
1406 return q;
1407 }
1408 a70: e24bd008 sub sp, fp, #8
1409 a74: e8bd0830 pop {r4, r5, fp}
1410 a78: e12fff1e bx lr
1411
1412 00000a7c <printf>:
1413 }
1414
1415 // Print to the given fd. Only understands %d, %x, %p, %s.
1416 void
1417 printf(int fd, char *fmt, ...)
1418 {
1419 a7c: e92d000e push {r1, r2, r3}
1420 a80: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
1421 a84: e28db020 add fp, sp, #32
1422 a88: e1a05000 mov r5, r0
1423 int c, i, state;
1424 uint *ap;
1425
1426 state = 0;
1427 ap = (uint*)(void*)&fmt + 1;
1428 for(i = 0; fmt[i]; i++){
1429 a8c: e59b4004 ldr r4, [fp, #4]
1430 a90: e5d48000 ldrb r8, [r4]
1431 a94: e3580000 cmp r8, #0
1432 a98: 0a000027 beq b3c <printf+0xc0>
1433 ap++;
1434 } else if(c == 's'){
1435 s = (char*)*ap;
1436 ap++;
1437 if(s == 0)
1438 s = "(null)";
1439 a9c: e59f712c ldr r7, [pc, #300] ; bd0 <printf+0x154>
1440 char *s;
1441 int c, i, state;
1442 uint *ap;
1443
1444 state = 0;
1445 ap = (uint*)(void*)&fmt + 1;
1446 aa0: e28b6008 add r6, fp, #8
1447 {
1448 char *s;
1449 int c, i, state;
1450 uint *ap;
1451
1452 state = 0;
1453 aa4: e3a0a000 mov sl, #0
1454 aa8: ea000008 b ad0 <printf+0x54>
1455 ap = (uint*)(void*)&fmt + 1;
1456 for(i = 0; fmt[i]; i++){
1457 c = fmt[i] & 0xff;
1458 if(state == 0){
1459 if(c == '%'){
1460 aac: e3580025 cmp r8, #37 ; 0x25
1461 state = '%';
1462 ab0: 01a0a008 moveq sl, r8
1463 state = 0;
1464 ap = (uint*)(void*)&fmt + 1;
1465 for(i = 0; fmt[i]; i++){
1466 c = fmt[i] & 0xff;
1467 if(state == 0){
1468 if(c == '%'){
1469 ab4: 0a000002 beq ac4 <printf+0x48>
1470 state = '%';
1471 } else {
1472 putc(fd, c);
1473 ab8: e1a00005 mov r0, r5
1474 abc: e1a01008 mov r1, r8
1475 ac0: ebffff9e bl 940 <putc>
1476 int c, i, state;
1477 uint *ap;
1478
1479 state = 0;
1480 ap = (uint*)(void*)&fmt + 1;
1481 for(i = 0; fmt[i]; i++){
1482 ac4: e5f48001 ldrb r8, [r4, #1]!
1483 ac8: e3580000 cmp r8, #0
1484 acc: 0a00001a beq b3c <printf+0xc0>
1485 c = fmt[i] & 0xff;
1486 if(state == 0){
1487 ad0: e35a0000 cmp sl, #0
1488 ad4: 0afffff4 beq aac <printf+0x30>
1489 if(c == '%'){
1490 state = '%';
1491 } else {
1492 putc(fd, c);
1493 }
1494 } else if(state == '%'){
1495 ad8: e35a0025 cmp sl, #37 ; 0x25
1496 adc: 1afffff8 bne ac4 <printf+0x48>
1497 if(c == 'd'){
1498 ae0: e3580064 cmp r8, #100 ; 0x64
1499 ae4: 0a00002c beq b9c <printf+0x120>
1500 printint(fd, *ap, 10, 1);
1501 ap++;
1502 } else if(c == 'x' || c == 'p'){
1503 ae8: e3580078 cmp r8, #120 ; 0x78
1504 aec: 13580070 cmpne r8, #112 ; 0x70
1505 af0: 13a09000 movne r9, #0
1506 af4: 03a09001 moveq r9, #1
1507 af8: 0a000013 beq b4c <printf+0xd0>
1508 printint(fd, *ap, 16, 0);
1509 ap++;
1510 } else if(c == 's'){
1511 afc: e3580073 cmp r8, #115 ; 0x73
1512 b00: 0a000018 beq b68 <printf+0xec>
1513 s = "(null)";
1514 while(*s != 0){
1515 putc(fd, *s);
1516 s++;
1517 }
1518 } else if(c == 'c'){
1519 b04: e3580063 cmp r8, #99 ; 0x63
1520 b08: 0a00002a beq bb8 <printf+0x13c>
1521 putc(fd, *ap);
1522 ap++;
1523 } else if(c == '%'){
1524 b0c: e3580025 cmp r8, #37 ; 0x25
1525 putc(fd, c);
1526 b10: e1a0100a mov r1, sl
1527 b14: e1a00005 mov r0, r5
1528 s++;
1529 }
1530 } else if(c == 'c'){
1531 putc(fd, *ap);
1532 ap++;
1533 } else if(c == '%'){
1534 b18: 0a000002 beq b28 <printf+0xac>
1535 putc(fd, c);
1536 } else {
1537 // Unknown % sequence. Print it to draw attention.
1538 putc(fd, '%');
1539 b1c: ebffff87 bl 940 <putc>
1540 putc(fd, c);
1541 b20: e1a00005 mov r0, r5
1542 b24: e1a01008 mov r1, r8
1543 b28: ebffff84 bl 940 <putc>
1544 int c, i, state;
1545 uint *ap;
1546
1547 state = 0;
1548 ap = (uint*)(void*)&fmt + 1;
1549 for(i = 0; fmt[i]; i++){
1550 b2c: e5f48001 ldrb r8, [r4, #1]!
1551 } else {
1552 // Unknown % sequence. Print it to draw attention.
1553 putc(fd, '%');
1554 putc(fd, c);
1555 }
1556 state = 0;
1557 b30: e1a0a009 mov sl, r9
1558 int c, i, state;
1559 uint *ap;
1560
1561 state = 0;
1562 ap = (uint*)(void*)&fmt + 1;
1563 for(i = 0; fmt[i]; i++){
1564 b34: e3580000 cmp r8, #0
1565 b38: 1affffe4 bne ad0 <printf+0x54>
1566 putc(fd, c);
1567 }
1568 state = 0;
1569 }
1570 }
1571 }
1572 b3c: e24bd020 sub sp, fp, #32
1573 b40: e8bd4ff0 pop {r4, r5, r6, r7, r8, r9, sl, fp, lr}
1574 b44: e28dd00c add sp, sp, #12
1575 b48: e12fff1e bx lr
1576 } else if(state == '%'){
1577 if(c == 'd'){
1578 printint(fd, *ap, 10, 1);
1579 ap++;
1580 } else if(c == 'x' || c == 'p'){
1581 printint(fd, *ap, 16, 0);
1582 b4c: e1a00005 mov r0, r5
1583 b50: e4961004 ldr r1, [r6], #4
1584 b54: e3a02010 mov r2, #16
1585 b58: e3a03000 mov r3, #0
1586 b5c: ebffff81 bl 968 <printint>
1587 } else {
1588 // Unknown % sequence. Print it to draw attention.
1589 putc(fd, '%');
1590 putc(fd, c);
1591 }
1592 state = 0;
1593 b60: e3a0a000 mov sl, #0
1594 b64: eaffffd6 b ac4 <printf+0x48>
1595 ap++;
1596 } else if(c == 'x' || c == 'p'){
1597 printint(fd, *ap, 16, 0);
1598 ap++;
1599 } else if(c == 's'){
1600 s = (char*)*ap;
1601 b68: e4968004 ldr r8, [r6], #4
1602 ap++;
1603 if(s == 0)
1604 s = "(null)";
1605 b6c: e3580000 cmp r8, #0
1606 b70: 01a08007 moveq r8, r7
1607 while(*s != 0){
1608 b74: e5d81000 ldrb r1, [r8]
1609 b78: e3510000 cmp r1, #0
1610 b7c: 0a000004 beq b94 <printf+0x118>
1611 putc(fd, *s);
1612 b80: e1a00005 mov r0, r5
1613 b84: ebffff6d bl 940 <putc>
1614 } else if(c == 's'){
1615 s = (char*)*ap;
1616 ap++;
1617 if(s == 0)
1618 s = "(null)";
1619 while(*s != 0){
1620 b88: e5f81001 ldrb r1, [r8, #1]!
1621 b8c: e3510000 cmp r1, #0
1622 b90: 1afffffa bne b80 <printf+0x104>
1623 } else {
1624 // Unknown % sequence. Print it to draw attention.
1625 putc(fd, '%');
1626 putc(fd, c);
1627 }
1628 state = 0;
1629 b94: e1a0a001 mov sl, r1
1630 b98: eaffffc9 b ac4 <printf+0x48>
1631 } else {
1632 putc(fd, c);
1633 }
1634 } else if(state == '%'){
1635 if(c == 'd'){
1636 printint(fd, *ap, 10, 1);
1637 b9c: e1a00005 mov r0, r5
1638 ba0: e4961004 ldr r1, [r6], #4
1639 ba4: e3a0200a mov r2, #10
1640 ba8: e3a03001 mov r3, #1
1641 bac: ebffff6d bl 968 <printint>
1642 } else {
1643 // Unknown % sequence. Print it to draw attention.
1644 putc(fd, '%');
1645 putc(fd, c);
1646 }
1647 state = 0;
1648 bb0: e3a0a000 mov sl, #0
1649 bb4: eaffffc2 b ac4 <printf+0x48>
1650 while(*s != 0){
1651 putc(fd, *s);
1652 s++;
1653 }
1654 } else if(c == 'c'){
1655 putc(fd, *ap);
1656 bb8: e4961004 ldr r1, [r6], #4
1657 bbc: e1a00005 mov r0, r5
1658 } else {
1659 // Unknown % sequence. Print it to draw attention.
1660 putc(fd, '%');
1661 putc(fd, c);
1662 }
1663 state = 0;
1664 bc0: e1a0a009 mov sl, r9
1665 while(*s != 0){
1666 putc(fd, *s);
1667 s++;
1668 }
1669 } else if(c == 'c'){
1670 putc(fd, *ap);
1671 bc4: e6ef1071 uxtb r1, r1
1672 bc8: ebffff5c bl 940 <putc>
1673 bcc: eaffffbc b ac4 <printf+0x48>
1674 bd0: 00000dc8 .word 0x00000dc8
1675
1676 00000bd4 <free>:
1677 free(void *ap)
1678 {
1679 Header *bp, *p;
1680
1681 bp = (Header*)ap - 1;
1682 for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
1683 bd4: e59f3098 ldr r3, [pc, #152] ; c74 <free+0xa0>
1684 static Header base;
1685 static Header *freep;
1686
1687 void
1688 free(void *ap)
1689 {
1690 bd8: e92d0830 push {r4, r5, fp}
1691 Header *bp, *p;
1692
1693 bp = (Header*)ap - 1;
1694 bdc: e240c008 sub ip, r0, #8
1695 for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
1696 be0: e5932000 ldr r2, [r3]
1697 static Header base;
1698 static Header *freep;
1699
1700 void
1701 free(void *ap)
1702 {
1703 be4: e28db008 add fp, sp, #8
1704 Header *bp, *p;
1705
1706 bp = (Header*)ap - 1;
1707 for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
1708 be8: e152000c cmp r2, ip
1709 bec: e5921000 ldr r1, [r2]
1710 bf0: 2a000001 bcs bfc <free+0x28>
1711 bf4: e15c0001 cmp ip, r1
1712 bf8: 3a000007 bcc c1c <free+0x48>
1713 if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
1714 bfc: e1520001 cmp r2, r1
1715 c00: 3a000003 bcc c14 <free+0x40>
1716 c04: e152000c cmp r2, ip
1717 c08: 3a000003 bcc c1c <free+0x48>
1718 c0c: e15c0001 cmp ip, r1
1719 c10: 3a000001 bcc c1c <free+0x48>
1720 static Header base;
1721 static Header *freep;
1722
1723 void
1724 free(void *ap)
1725 {
1726 c14: e1a02001 mov r2, r1
1727 c18: eafffff2 b be8 <free+0x14>
1728
1729 bp = (Header*)ap - 1;
1730 for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
1731 if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
1732 break;
1733 if(bp + bp->s.size == p->s.ptr){
1734 c1c: e5104004 ldr r4, [r0, #-4]
1735 if(p + p->s.size == bp){
1736 p->s.size += bp->s.size;
1737 p->s.ptr = bp->s.ptr;
1738 } else
1739 p->s.ptr = bp;
1740 freep = p;
1741 c20: e5832000 str r2, [r3]
1742
1743 bp = (Header*)ap - 1;
1744 for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
1745 if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
1746 break;
1747 if(bp + bp->s.size == p->s.ptr){
1748 c24: e08c5184 add r5, ip, r4, lsl #3
1749 c28: e1550001 cmp r5, r1
1750 bp->s.size += p->s.ptr->s.size;
1751 c2c: 05911004 ldreq r1, [r1, #4]
1752 c30: 00814004 addeq r4, r1, r4
1753 c34: 05004004 streq r4, [r0, #-4]
1754 bp->s.ptr = p->s.ptr->s.ptr;
1755 c38: 05921000 ldreq r1, [r2]
1756 c3c: 05911000 ldreq r1, [r1]
1757 } else
1758 bp->s.ptr = p->s.ptr;
1759 c40: e5001008 str r1, [r0, #-8]
1760 if(p + p->s.size == bp){
1761 c44: e5921004 ldr r1, [r2, #4]
1762 c48: e0824181 add r4, r2, r1, lsl #3
1763 c4c: e15c0004 cmp ip, r4
1764 p->s.size += bp->s.size;
1765 p->s.ptr = bp->s.ptr;
1766 } else
1767 p->s.ptr = bp;
1768 c50: 1582c000 strne ip, [r2]
1769 bp->s.size += p->s.ptr->s.size;
1770 bp->s.ptr = p->s.ptr->s.ptr;
1771 } else
1772 bp->s.ptr = p->s.ptr;
1773 if(p + p->s.size == bp){
1774 p->s.size += bp->s.size;
1775 c54: 0510c004 ldreq ip, [r0, #-4]
1776 c58: 008c1001 addeq r1, ip, r1
1777 c5c: 05821004 streq r1, [r2, #4]
1778 p->s.ptr = bp->s.ptr;
1779 c60: 05101008 ldreq r1, [r0, #-8]
1780 c64: 05821000 streq r1, [r2]
1781 } else
1782 p->s.ptr = bp;
1783 freep = p;
1784 }
1785 c68: e24bd008 sub sp, fp, #8
1786 c6c: e8bd0830 pop {r4, r5, fp}
1787 c70: e12fff1e bx lr
1788 c74: 00000de0 .word 0x00000de0
1789
1790 00000c78 <malloc>:
1791 return freep;
1792 }
1793
1794 void*
1795 malloc(uint nbytes)
1796 {
1797 c78: e92d49f8 push {r3, r4, r5, r6, r7, r8, fp, lr}
1798 Header *p, *prevp;
1799 uint nunits;
1800
1801 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1802 c7c: e2804007 add r4, r0, #7
1803 if((prevp = freep) == 0){
1804 c80: e59f50d4 ldr r5, [pc, #212] ; d5c <malloc+0xe4>
1805 malloc(uint nbytes)
1806 {
1807 Header *p, *prevp;
1808 uint nunits;
1809
1810 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1811 c84: e1a041a4 lsr r4, r4, #3
1812 return freep;
1813 }
1814
1815 void*
1816 malloc(uint nbytes)
1817 {
1818 c88: e28db01c add fp, sp, #28
1819 Header *p, *prevp;
1820 uint nunits;
1821
1822 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1823 if((prevp = freep) == 0){
1824 c8c: e5953000 ldr r3, [r5]
1825 malloc(uint nbytes)
1826 {
1827 Header *p, *prevp;
1828 uint nunits;
1829
1830 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1831 c90: e2844001 add r4, r4, #1
1832 if((prevp = freep) == 0){
1833 c94: e3530000 cmp r3, #0
1834 c98: 0a00002b beq d4c <malloc+0xd4>
1835 c9c: e5930000 ldr r0, [r3]
1836 ca0: e5902004 ldr r2, [r0, #4]
1837 base.s.ptr = freep = prevp = &base;
1838 base.s.size = 0;
1839 }
1840 for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
1841 if(p->s.size >= nunits){
1842 ca4: e1520004 cmp r2, r4
1843 ca8: 2a00001b bcs d1c <malloc+0xa4>
1844 morecore(uint nu)
1845 {
1846 char *p;
1847 Header *hp;
1848
1849 if(nu < 4096)
1850 cac: e59f80ac ldr r8, [pc, #172] ; d60 <malloc+0xe8>
1851 p->s.size -= nunits;
1852 p += p->s.size;
1853 p->s.size = nunits;
1854 }
1855 freep = prevp;
1856 return (void*)(p + 1);
1857 cb0: e1a07184 lsl r7, r4, #3
1858 cb4: ea000003 b cc8 <malloc+0x50>
1859 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1860 if((prevp = freep) == 0){
1861 base.s.ptr = freep = prevp = &base;
1862 base.s.size = 0;
1863 }
1864 for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
1865 cb8: e5930000 ldr r0, [r3]
1866 if(p->s.size >= nunits){
1867 cbc: e5902004 ldr r2, [r0, #4]
1868 cc0: e1540002 cmp r4, r2
1869 cc4: 9a000014 bls d1c <malloc+0xa4>
1870 p->s.size = nunits;
1871 }
1872 freep = prevp;
1873 return (void*)(p + 1);
1874 }
1875 if(p == freep)
1876 cc8: e5952000 ldr r2, [r5]
1877 ccc: e1a03000 mov r3, r0
1878 cd0: e1500002 cmp r0, r2
1879 cd4: 1afffff7 bne cb8 <malloc+0x40>
1880 morecore(uint nu)
1881 {
1882 char *p;
1883 Header *hp;
1884
1885 if(nu < 4096)
1886 cd8: e1540008 cmp r4, r8
1887 nu = 4096;
1888 p = sbrk(nu * sizeof(Header));
1889 cdc: 81a00007 movhi r0, r7
1890 ce0: 93a00902 movls r0, #32768 ; 0x8000
1891 morecore(uint nu)
1892 {
1893 char *p;
1894 Header *hp;
1895
1896 if(nu < 4096)
1897 ce4: 81a06004 movhi r6, r4
1898 ce8: 93a06a01 movls r6, #4096 ; 0x1000
1899 nu = 4096;
1900 p = sbrk(nu * sizeof(Header));
1901 cec: ebfffeec bl 8a4 <sbrk>
1902 cf0: e1a03000 mov r3, r0
1903 if(p == (char*)-1)
1904 cf4: e3730001 cmn r3, #1
1905 return 0;
1906 hp = (Header*)p;
1907 hp->s.size = nu;
1908 free((void*)(hp + 1));
1909 cf8: e2800008 add r0, r0, #8
1910 Header *hp;
1911
1912 if(nu < 4096)
1913 nu = 4096;
1914 p = sbrk(nu * sizeof(Header));
1915 if(p == (char*)-1)
1916 cfc: 0a000010 beq d44 <malloc+0xcc>
1917 return 0;
1918 hp = (Header*)p;
1919 hp->s.size = nu;
1920 d00: e5836004 str r6, [r3, #4]
1921 free((void*)(hp + 1));
1922 d04: ebffffb2 bl bd4 <free>
1923 return freep;
1924 d08: e5953000 ldr r3, [r5]
1925 }
1926 freep = prevp;
1927 return (void*)(p + 1);
1928 }
1929 if(p == freep)
1930 if((p = morecore(nunits)) == 0)
1931 d0c: e3530000 cmp r3, #0
1932 d10: 1affffe8 bne cb8 <malloc+0x40>
1933 return 0;
1934 d14: e1a00003 mov r0, r3
1935 }
1936 }
1937 d18: e8bd89f8 pop {r3, r4, r5, r6, r7, r8, fp, pc}
1938 base.s.ptr = freep = prevp = &base;
1939 base.s.size = 0;
1940 }
1941 for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
1942 if(p->s.size >= nunits){
1943 if(p->s.size == nunits)
1944 d1c: e1540002 cmp r4, r2
1945 prevp->s.ptr = p->s.ptr;
1946 else {
1947 p->s.size -= nunits;
1948 d20: 10642002 rsbne r2, r4, r2
1949 d24: 15802004 strne r2, [r0, #4]
1950 base.s.size = 0;
1951 }
1952 for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
1953 if(p->s.size >= nunits){
1954 if(p->s.size == nunits)
1955 prevp->s.ptr = p->s.ptr;
1956 d28: 05902000 ldreq r2, [r0]
1957 else {
1958 p->s.size -= nunits;
1959 p += p->s.size;
1960 d2c: 10800182 addne r0, r0, r2, lsl #3
1961 base.s.size = 0;
1962 }
1963 for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
1964 if(p->s.size >= nunits){
1965 if(p->s.size == nunits)
1966 prevp->s.ptr = p->s.ptr;
1967 d30: 05832000 streq r2, [r3]
1968 else {
1969 p->s.size -= nunits;
1970 p += p->s.size;
1971 p->s.size = nunits;
1972 d34: 15804004 strne r4, [r0, #4]
1973 }
1974 freep = prevp;
1975 d38: e5853000 str r3, [r5]
1976 return (void*)(p + 1);
1977 d3c: e2800008 add r0, r0, #8
1978 d40: e8bd89f8 pop {r3, r4, r5, r6, r7, r8, fp, pc}
1979 }
1980 if(p == freep)
1981 if((p = morecore(nunits)) == 0)
1982 return 0;
1983 d44: e3a00000 mov r0, #0
1984 d48: e8bd89f8 pop {r3, r4, r5, r6, r7, r8, fp, pc}
1985 Header *p, *prevp;
1986 uint nunits;
1987
1988 nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
1989 if((prevp = freep) == 0){
1990 base.s.ptr = freep = prevp = &base;
1991 d4c: e2850004 add r0, r5, #4
1992 d50: e5850000 str r0, [r5]
1993 base.s.size = 0;
1994 d54: e9850009 stmib r5, {r0, r3}
1995 d58: eaffffd3 b cac <malloc+0x34>
1996 d5c: 00000de0 .word 0x00000de0
1997 d60: 00000fff .word 0x00000fff