arm 9 的裸机启动代码

我自己写了裸机启动汇编，很简单的一段，关闭了看门狗，初始化了串口，sdram和nand flash，在链接文件中指定bin文件中代码的放置位置，然后调用C函数把nand flash的数据读出来，放到sdram中，可死活就是第一个字节从flash中读出来，然后把第一个字节给了0x30000000的地址上，完了就读不出来数据，一直从头到尾都是第一个字节的内容。
S3C2440 的裸机启动代码：
.globl _start
/*关闭看门狗*/
_start:
ldr r0, =0x53000000
mov r1,#0
str r1,[r0] @把r1中的值写到r0的地址中

ldr sp,=4*1024
bl clk_init
bl sdram_init

adr r0,_start
ldr r1,=_start
ldr r2,=bss_start
sub r2,r2,r1
cmp r0,r1
beq clean_bss

bl copytosdram
cmp r0,#0
bne halt

clean_bss:
ldr r0,=bss_start
ldr r1,=bss_end
mov r3,#0
cmp r0,r1
beq on_sdram
clean_loop:
str r3,[r0],#4
cmp r0,r1
bne clean_loop

on_sdram:
ldr sp,=0x34000000
ldr pc, =over
halt:
b halt

链接文件：
SECtiONS
{
. = 0x30000000;
.text :
{
start.o
* (.text)
}
.rodata :
{
* (.rodata)
}
.data :
{
* (.data)
}

bss_start =  . ;

.bss  ALIGN(4):
{
* (.bss)
* (COMMON)
}
bss_end = . ;
}

这个是拷贝函数：
int copytosdram(unsigned long add1,unsigned long add2,unsigned long length)
{
int ret=0;
int i=0;
unsigned char ch=0;
nand_init();
ret=nand_readbuff(add1,add2,length);
return ret;
}

int nand_readbuff(unsigned long nand_start,unsigned long sdram_buff,unsigned long size)
{
unsigned long add=nand_start;
unsigned long i=0;
int l=0;
unsigned char *dest=(unsigned char*)sdram_buff;

enable_nandflash();
for(i=nand_start;i {
nand_sendCMD(0x00);
nand_sendADD(i);
nand_sendCMD(0x30);
wait_ready();
for(l=0;l<2048&&i {
if(l==0)
nand_read();
dest=nand_read();
}
}
disable_nandflash();
return 0;
}

再把反汇编文件站上来，以便于大家分析

led.elf：    文件格式 elf32-littlearm

Disassembly of section .text:

00000000 <_start>:
0: e3a00453 mov r0, #1392508928 ; 0x53000000
4: e3a01000 mov r1, #0 ; 0x0
8: e5801000 str r1, [r0]
c: e3a0da01 mov sp, #4096 ; 0x1000
  10: eb000018 bl 78
  14: eb00002a bl c4
  18: e24f0020 sub r0, pc, #32 ; 0x20
  1c: e59f1044 ldr r1, [pc, #68] ; 68 <.text+0x68>
  20: e59f2044 ldr r2, [pc, #68] ; 6c <.text+0x6c>
  24: e0422001 sub r2, r2, r1
  28: e1500001 cmp r0, r1
  2c: 0a000002 beq 3c
  30: eb000049 bl 15c
  34: e3500000 cmp r0, #0 ; 0x0
  38: 1a000009 bne 64

0000003c :
  3c: e59f0028 ldr r0, [pc, #40] ; 6c <.text+0x6c>
  40: e59f1028 ldr r1, [pc, #40] ; 70 <.text+0x70>
  44: e3a03000 mov r3, #0 ; 0x0
  48: e1500001 cmp r0, r1
  4c: 0a000002 beq 5c

00000050 :
  50: e4803004 str r3, [r0], #4
  54: e1500001 cmp r0, r1
  58: 1afffffc bne 50

0000005c :
  5c: e3a0d30d mov sp, #872415232 ; 0x34000000
  60: e59ff00c ldr pc, [pc, #12] ; 74 <.text+0x74>

00000064 :
  64: eafffffe b 64
  68: 00000000 andeq r0, r0, r0
  6c: 00000930 andeq r0, r0, r0, lsr r9
  70: 00000930 andeq r0, r0, r0, lsr r9
  74: 00000270 andeq r0, r0, r0, ror r2

00000078 :
  78: e1a0c00d mov ip, sp
  7c: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
  80: e24cb004 sub fp, ip, #4 ; 0x4
  84: e3a02313 mov r2, #1275068416 ; 0x4c000000
  88: e3e03000 mvn r3, #0 ; 0x0
  8c: e5823000 str r3, [r2]
  90: e3a03313 mov r3, #1275068416 ; 0x4c000000
  94: e2833014 add r3, r3, #20 ; 0x14
  98: e3a02003 mov r2, #3 ; 0x3
  9c: e5832000 str r2, [r3]
  a0: ee110f10 mrc 15, 0, r0, cr1, cr0, {0}
  a4: e3800103 orr r0, r0, #-1073741824 ; 0xc0000000
  a8: ee010f10 mcr 15, 0, r0, cr1, cr0, {0}
  ac: e3a02313 mov r2, #1275068416 ; 0x4c000000
  b0: e2822004 add r2, r2, #4 ; 0x4
  b4: e3a03917 mov r3, #376832 ; 0x5c000
  b8: e2833012 add r3, r3, #18 ; 0x12
  bc: e5823000 str r3, [r2]
  c0: e89da800 ldmia sp, {fp, sp, pc}

000000c4 :
  c4: e1a0c00d mov ip, sp
  c8: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
  cc: e24cb004 sub fp, ip, #4 ; 0x4
  d0: e3a02312 mov r2, #1207959552 ; 0x48000000
  d4: e3a03312 mov r3, #1207959552 ; 0x48000000
  d8: e5933000 ldr r3, [r3]
  dc: e3c334ff bic r3, r3, #-16777216 ; 0xff000000
  e0: e3833422 orr r3, r3, #570425344 ; 0x22000000
  e4: e5823000 str r3, [r2]
  e8: e3a02312 mov r2, #1207959552 ; 0x48000000
  ec: e282201c add r2, r2, #28 ; 0x1c
  f0: e3a03906 mov r3, #98304 ; 0x18000
  f4: e2833005 add r3, r3, #5 ; 0x5
  f8: e5823000 str r3, [r2]
  fc: e3a02312 mov r2, #1207959552 ; 0x48000000
100: e2822020 add r2, r2, #32 ; 0x20
104: e3a03906 mov r3, #98304 ; 0x18000
108: e2833005 add r3, r3, #5 ; 0x5
10c: e5823000 str r3, [r2]
110: e3a02312 mov r2, #1207959552 ; 0x48000000
114: e2822024 add r2, r2, #36 ; 0x24
118: e3a03729 mov r3, #10747904 ; 0xa40000
11c: e2833f79 add r3, r3, #484 ; 0x1e4
120: e2833002 add r3, r3, #2 ; 0x2
124: e5823000 str r3, [r2]
128: e3a03312 mov r3, #1207959552 ; 0x48000000
12c: e2833028 add r3, r3, #40 ; 0x28
130: e3a02032 mov r2, #50 ; 0x32
134: e5832000 str r2, [r3]
138: e3a03312 mov r3, #1207959552 ; 0x48000000
13c: e283302c add r3, r3, #44 ; 0x2c
140: e3a02030 mov r2, #48 ; 0x30
144: e5832000 str r2, [r3]
148: e3a03312 mov r3, #1207959552 ; 0x48000000
14c: e2833030 add r3, r3, #48 ; 0x30
150: e3a02030 mov r2, #48 ; 0x30
154: e5832000 str r2, [r3]
158: e89da800 ldmia sp, {fp, sp, pc}

0000015c :
15c: e1a0c00d mov ip, sp
160: e92dd810 s>真美妙b sp!, {r4, fp, ip, lr, pc}
164: e24cb004 sub fp, ip, #4 ; 0x4
168: e24dd01c sub sp, sp, #28 ; 0x1c
16c: e50b0014 str r0, [fp, #-20]
170: e50b1018 str r1, [fp, #-24]
174: e50b201c str r2, [fp, #-28]
178: e51b3014 ldr r3, [fp, #-20]
17c: e50b3020 str r3, [fp, #-32]
180: e51b3018 ldr r3, [fp, #-24]
184: e50b3024 str r3, [fp, #-36]
188: e3a03000 mov r3, #0 ; 0x0
18c: e50b3028 str r3, [fp, #-40]
190: e3a03000 mov r3, #0 ; 0x0
194: e50b302c str r3, [fp, #-44]
198: eb000171 bl 764
19c: eb00011f bl 620
1a0: eb000157 bl 704
1a4: e51b2028 ldr r2, [fp, #-40]
1a8: e51b301c ldr r3, [fp, #-28]
1ac: e1520003 cmp r2, r3
1b0: 2a00002a bcs 260
1b4: e3a00000 mov r0, #0 ; 0x0
1b8: eb000124 bl 650
1bc: e51b0020 ldr r0, [fp, #-32]
1c0: eb00012e bl 680
1c4: eb000115 bl 620
1c8: e3a00030 mov r0, #48 ; 0x30
1cc: eb00011f bl 650
1d0: eb000112 bl 620
1d4: e3a03000 mov r3, #0 ; 0x0
1d8: e50b302c str r3, [fp, #-44]
1dc: e51b202c ldr r2, [fp, #-44]
1e0: e3a03e7f mov r3, #2032 ; 0x7f0
1e4: e283300f add r3, r3, #15 ; 0xf
1e8: e1520003 cmp r2, r3
1ec: ca000017 bgt 250
1f0: e51b2028 ldr r2, [fp, #-40]
1f4: e51b301c ldr r3, [fp, #-28]
1f8: e1520003 cmp r2, r3
1fc: 2a000013 bcs 250
200: e51b3028 ldr r3, [fp, #-40]
204: e3530000 cmp r3, #0 ; 0x0
208: 1a000000 bne 210
20c: eb00014b bl 740
210: e24b0028 sub r0, fp, #40 ; 0x28
214: e5902000 ldr r2, [r0]
218: e1a03002 mov r3, r2
21c: e1a01103 mov r1, r3, lsl #2
220: e51b3024 ldr r3, [fp, #-36]
224: e0814003 add r4, r1, r3
228: e2822001 add r2, r2, #1 ; 0x1
22c: e5802000 str r2, [r0]
230: eb000142 bl 740
234: e1a03000 mov r3, r0
238: e20330ff and r3, r3, #255 ; 0xff
23c: e5843000 str r3, [r4]
240: e51b302c ldr r3, [fp, #-44]
244: e2833001 add r3, r3, #1 ; 0x1
248: e50b302c str r3, [fp, #-44]
24c: eaffffe2 b 1dc
250: e51b3020 ldr r3, [fp, #-32]
254: e2833b02 add r3, r3, #2048 ; 0x800
258: e50b3020 str r3, [fp, #-32]
25c: eaffffd0 b 1a4
260: e3a03000 mov r3, #0 ; 0x0
264: e1a00003 mov r0, r3
268: e24bd010 sub sp, fp, #16 ; 0x10
26c: e89da810 ldmia sp, {r4, fp, sp, pc}

00000270 :
270: e1a0c00d mov ip, sp
274: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
278: e24cb004 sub fp, ip, #4 ; 0x4
27c: eb000009 bl 2a8
280: eb0000d3 bl 5d4
284: eafffffd b 280

00000288 :
288: e1a0c00d mov ip, sp
28c: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
290: e24cb004 sub fp, ip, #4 ; 0x4
294: e3a02453 mov r2, #1392508928 ; 0x53000000
298: e3a03902 mov r3, #32768 ; 0x8000
29c: e2833021 add r3, r3, #33 ; 0x21
2a0: e5823000 str r3, [r2]
2a4: e89da800 ldmia sp, {fp, sp, pc}

000002a8 :
2a8: e1a0c00d mov ip, sp
2ac: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
2b0: e24cb004 sub fp, ip, #4 ; 0x4
2b4: e3a02456 mov r2, #1442840576 ; 0x56000000
2b8: e2822070 add r2, r2, #112 ; 0x70
2bc: e3a03456 mov r3, #1442840576 ; 0x56000000
2c0: e2833070 add r3, r3, #112 ; 0x70
2c4: e5933000 ldr r3, [r3]
2c8: e3c330f0 bic r3, r3, #240 ; 0xf0
2cc: e38330a0 orr r3, r3, #160 ; 0xa0
2d0: e5823000 str r3, [r2]
2d4: e3a02456 mov r2, #1442840576 ; 0x56000000
2d8: e2822078 add r2, r2, #120 ; 0x78
2dc: e3a03456 mov r3, #1442840576 ; 0x56000000
2e0: e2833078 add r3, r3, #120 ; 0x78
2e4: e5933000 ldr r3, [r3]
2e8: e3c3300c bic r3, r3, #12 ; 0xc
2ec: e383300c orr r3, r3, #12 ; 0xc
2f0: e5823000 str r3, [r2]
2f4: e3a02205 mov r2, #1342177280 ; 0x50000000
2f8: e3a03003 mov r3, #3 ; 0x3
2fc: e5823000 str r3, [r2]
300: e3a02245 mov r2, #1342177284 ; 0x50000004
304: e3a03b02 mov r3, #2048 ; 0x800
308: e2833005 add r3, r3, #5 ; 0x5
30c: e5823000 str r3, [r2]
310: e3a03205 mov r3, #1342177280 ; 0x50000000
314: e2833028 add r3, r3, #40 ; 0x28
318: e3a0201a mov r2, #26 ; 0x1a
31c: e5832000 str r2, [r3]
320: e89da800 ldmia sp, {fp, sp, pc}

00000324 :
324: e1a0c00d mov ip, sp
328: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
32c: e24cb004 sub fp, ip, #4 ; 0x4
330: e24dd010 sub sp, sp, #16 ; 0x10
334: e50b0010 str r0, [fp, #-16]
338: e1a03001 mov r3, r1
33c: e50b2018 str r2, [fp, #-24]
340: e54b3011 strb r3, [fp, #-17]
344: e51b3010 ldr r3, [fp, #-16]
348: e50b301c str r3, [fp, #-28]
34c: e24b3018 sub r3, fp, #24 ; 0x18
350: e5932000 ldr r2, [r3]
354: e1a01002 mov r1, r2
358: e2422001 sub r2, r2, #1 ; 0x1
35c: e5832000 str r2, [r3]
360: e3510000 cmp r1, #0 ; 0x0
364: da000007 ble 388
368: e24b001c sub r0, fp, #28 ; 0x1c
36c: e5903000 ldr r3, [r0]
370: e1a01003 mov r1, r3
374: e55b2011 ldrb r2, [fp, #-17]
378: e5c12000 strb r2, [r1]
37c: e2833001 add r3, r3, #1 ; 0x1
380: e5803000 str r3, [r0]
384: eafffff0 b 34c
388: e24bd00c sub sp, fp, #12 ; 0xc
38c: e89da800 ldmia sp, {fp, sp, pc}

00000390 :
390: e1a0c00d mov ip, sp
394: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
398: e24cb004 sub fp, ip, #4 ; 0x4
39c: e24dd008 sub sp, sp, #8 ; 0x8
3a0: e50b0010 str r0, [fp, #-16]
3a4: e3a03000 mov r3, #0 ; 0x0
3a8: e50b3014 str r3, [fp, #-20]
3ac: e24b2010 sub r2, fp, #16 ; 0x10
3b0: e5923000 ldr r3, [r2]
3b4: e5d31000 ldrb r1, [r3]
3b8: e2833001 add r3, r3, #1 ; 0x1
3bc: e5823000 str r3, [r2]
3c0: e20130ff and r3, r1, #255 ; 0xff
3c4: e3530000 cmp r3, #0 ; 0x0
3c8: 0a000003 beq 3dc
3cc: e51b3014 ldr r3, [fp, #-20]
3d0: e2833001 add r3, r3, #1 ; 0x1
3d4: e50b3014 str r3, [fp, #-20]
3d8: eafffff3 b 3ac
3dc: e51b3014 ldr r3, [fp, #-20]
3e0: e1a00003 mov r0, r3
3e4: e24bd00c sub sp, fp, #12 ; 0xc
3e8: e89da800 ldmia sp, {fp, sp, pc}

000003ec :
3ec: e1a0c00d mov ip, sp
3f0: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
3f4: e24cb004 sub fp, ip, #4 ; 0x4
3f8: e24dd004 sub sp, sp, #4 ; 0x4
3fc: e1a03000 mov r3, r0
400: e54b300d strb r3, [fp, #-13]
404: e3a03205 mov r3, #1342177280 ; 0x50000000
408: e2833010 add r3, r3, #16 ; 0x10
40c: e5933000 ldr r3, [r3]
410: e1a030a3 mov r3, r3, lsr #1
414: e2033001 and r3, r3, #1 ; 0x1
418: e3530000 cmp r3, #0 ; 0x0
41c: 1a000000 bne 424
420: eafffff7 b 404
424: e3a03205 mov r3, #1342177280 ; 0x50000000
428: e2833020 add r3, r3, #32 ; 0x20
42c: e55b200d ldrb r2, [fp, #-13]
430: e5832000 str r2, [r3]
434: e3a03001 mov r3, #1 ; 0x1
438: e1a00003 mov r0, r3
43c: e89da808 ldmia sp, {r3, fp, sp, pc}

00000440 :
440: e1a0c00d mov ip, sp
444: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
448: e24cb004 sub fp, ip, #4 ; 0x4
44c: e24dd00c sub sp, sp, #12 ; 0xc
450: e50b0010 str r0, [fp, #-16]
454: e50b1014 str r1, [fp, #-20]
458: e3a03000 mov r3, #0 ; 0x0
45c: e50b3018 str r3, [fp, #-24]
460: e3a03000 mov r3, #0 ; 0x0
464: e50b3018 str r3, [fp, #-24]
468: e51b2018 ldr r2, [fp, #-24]
46c: e51b3014 ldr r3, [fp, #-20]
470: e1520003 cmp r2, r3
474: aa000012 bge 4c4
478: e3a03205 mov r3, #1342177280 ; 0x50000000
47c: e2833010 add r3, r3, #16 ; 0x10
480: e5933000 ldr r3, [r3]
484: e1a030a3 mov r3, r3, lsr #1
488: e2033001 and r3, r3, #1 ; 0x1
48c: e3530000 cmp r3, #0 ; 0x0
490: 1a000000 bne 498
494: eafffff7 b 478
498: e3a02205 mov r2, #1342177280 ; 0x50000000
49c: e2822020 add r2, r2, #32 ; 0x20
4a0: e51b1010 ldr r1, [fp, #-16]
4a4: e51b3018 ldr r3, [fp, #-24]
4a8: e0813003 add r3, r1, r3
4ac: e5d33000 ldrb r3, [r3]
4b0: e5823000 str r3, [r2]
4b4: e51b3018 ldr r3, [fp, #-24]
4b8: e2833001 add r3, r3, #1 ; 0x1
4bc: e50b3018 str r3, [fp, #-24]
4c0: eaffffe8 b 468
4c4: e51b3018 ldr r3, [fp, #-24]
4c8: e1a00003 mov r0, r3
4cc: e24bd00c sub sp, fp, #12 ; 0xc
4d0: e89da800 ldmia sp, {fp, sp, pc}

000004d4 :
4d4: e1a0c00d mov ip, sp
4d8: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
4dc: e24cb004 sub fp, ip, #4 ; 0x4
4e0: e3a03205 mov r3, #1342177280 ; 0x50000000
4e4: e2833010 add r3, r3, #16 ; 0x10
4e8: e5933000 ldr r3, [r3]
4ec: e2033001 and r3, r3, #1 ; 0x1
4f0: e3530000 cmp r3, #0 ; 0x0
4f4: 1a000000 bne 4fc
4f8: eafffff8 b 4e0
4fc: e3a03205 mov r3, #1342177280 ; 0x50000000
500: e2833024 add r3, r3, #36 ; 0x24
504: e5933000 ldr r3, [r3]
508: e20330ff and r3, r3, #255 ; 0xff
50c: e1a00003 mov r0, r3
510: e89da800 ldmia sp, {fp, sp, pc}

00000514 :
514: e1a0c00d mov ip, sp
518: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
51c: e24cb004 sub fp, ip, #4 ; 0x4
520: e24dd010 sub sp, sp, #16 ; 0x10
524: e50b0010 str r0, [fp, #-16]
528: e3a03000 mov r3, #0 ; 0x0
52c: e50b3014 str r3, [fp, #-20]
530: e3a03000 mov r3, #0 ; 0x0
534: e50b3018 str r3, [fp, #-24]
538: e3a03000 mov r3, #0 ; 0x0
53c: e50b301c str r3, [fp, #-28]
540: e51b2014 ldr r2, [fp, #-20]
544: e3a03cff mov r3, #65280 ; 0xff00
548: e28330fe add r3, r3, #254 ; 0xfe
54c: e1520003 cmp r2, r3
550: 8a00001b bhi 5c4
554: e3a03205 mov r3, #1342177280 ; 0x50000000
558: e2833010 add r3, r3, #16 ; 0x10
55c: e5933000 ldr r3, [r3]
560: e2033001 and r3, r3, #1 ; 0x1
564: e3530000 cmp r3, #0 ; 0x0
568: 0a00000e beq 5a8
56c: e51b2010 ldr r2, [fp, #-16]
570: e51b3018 ldr r3, [fp, #-24]
574: e0822003 add r2, r2, r3
578: e3a03205 mov r3, #1342177280 ; 0x50000000
57c: e2833024 add r3, r3, #36 ; 0x24
580: e5933000 ldr r3, [r3]
584: e5c23000 strb r3, [r2]
588: e3a03001 mov r3, #1 ; 0x1
58c: e50b301c str r3, [fp, #-28]
590: e3a03000 mov r3, #0 ; 0x0
594: e50b3014 str r3, [fp, #-20]
598: e51b3018 ldr r3, [fp, #-24]
59c: e2833001 add r3, r3, #1 ; 0x1
5a0: e50b3018 str r3, [fp, #-24]
5a4: eaffffe5 b 540
5a8: e51b301c ldr r3, [fp, #-28]
5ac: e3530001 cmp r3, #1 ; 0x1
5b0: 1affffe2 bne 540
5b4: e51b3014 ldr r3, [fp, #-20]
5b8: e2833001 add r3, r3, #1 ; 0x1
5bc: e50b3014 str r3, [fp, #-20]
5c0: eaffffde b 540
5c4: e51b3018 ldr r3, [fp, #-24]
5c8: e1a00003 mov r0, r3
5cc: e24bd00c sub sp, fp, #12 ; 0xc
5d0: e89da800 ldmia sp, {fp, sp, pc}

000005d4 :
5d4: e1a0c00d mov ip, sp
5d8: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
5dc: e24cb004 sub fp, ip, #4 ; 0x4
5e0: e24dd008 sub sp, sp, #8 ; 0x8
5e4: e3a03000 mov r3, #0 ; 0x0
5e8: e54b300d strb r3, [fp, #-13]
5ec: e3a03000 mov r3, #0 ; 0x0
5f0: e54b300e strb r3, [fp, #-14]
5f4: e59f3020 ldr r3, [pc, #32] ; 61c <.text+0x61c>
5f8: e50b3014 str r3, [fp, #-20]
5fc: e51b0014 ldr r0, [fp, #-20]
600: ebffff62 bl 390
604: e1a03000 mov r3, r0
608: e51b0014 ldr r0, [fp, #-20]
60c: e1a01003 mov r1, r3
610: ebffff8a bl 440
614: e24bd00c sub sp, fp, #12 ; 0xc
618: e89da800 ldmia sp, {fp, sp, pc}
61c: 00000894 muleq r0, r4, r8

00000620 :
620: e1a0c00d mov ip, sp
624: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
628: e24cb004 sub fp, ip, #4 ; 0x4
62c: e3a0344e mov r3, #1308622848 ; 0x4e000000
630: e2833020 add r3, r3, #32 ; 0x20
634: e5933000 ldr r3, [r3]
638: e2233001 eor r3, r3, #1 ; 0x1
63c: e2033001 and r3, r3, #1 ; 0x1
640: e3530000 cmp r3, #0 ; 0x0
644: 0a000000 beq 64c
648: eafffff7 b 62c
64c: e89da800 ldmia sp, {fp, sp, pc}

00000650 :
650: e1a0c00d mov ip, sp
654: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
658: e24cb004 sub fp, ip, #4 ; 0x4
65c: e24dd004 sub sp, sp, #4 ; 0x4
660: e1a03000 mov r3, r0
664: e54b300d strb r3, [fp, #-13]
668: ebffffec bl 620
66c: e3a0344e mov r3, #1308622848 ; 0x4e000000
670: e2833008 add r3, r3, #8 ; 0x8
674: e55b200d ldrb r2, [fp, #-13]
678: e5c32000 strb r2, [r3]
67c: e89da808 ldmia sp, {r3, fp, sp, pc}

00000680 :
680: e1a0c00d mov ip, sp
684: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
688: e24cb004 sub fp, ip, #4 ; 0x4
68c: e24dd004 sub sp, sp, #4 ; 0x4
690: e50b0010 str r0, [fp, #-16]
694: ebffffe1 bl 620
698: e3a0344e mov r3, #1308622848 ; 0x4e000000
69c: e283300c add r3, r3, #12 ; 0xc
6a0: e51b2010 ldr r2, [fp, #-16]
6a4: e5c32000 strb r2, [r3]
6a8: e3a0244e mov r2, #1308622848 ; 0x4e000000
6ac: e282200c add r2, r2, #12 ; 0xc
6b0: e51b3010 ldr r3, [fp, #-16]
6b4: e1a03423 mov r3, r3, lsr #8
6b8: e2033007 and r3, r3, #7 ; 0x7
6bc: e5c23000 strb r3, [r2]
6c0: e3a0244e mov r2, #1308622848 ; 0x4e000000
6c4: e282200c add r2, r2, #12 ; 0xc
6c8: e51b3010 ldr r3, [fp, #-16]
6cc: e1a035a3 mov r3, r3, lsr #11
6d0: e5c23000 strb r3, [r2]
6d4: e3a0244e mov r2, #1308622848 ; 0x4e000000
6d8: e282200c add r2, r2, #12 ; 0xc
6dc: e51b3010 ldr r3, [fp, #-16]
6e0: e1a03ea3 mov r3, r3, lsr #29
6e4: e5c23000 strb r3, [r2]
6e8: e3a0244e mov r2, #1308622848 ; 0x4e000000
6ec: e282200c add r2, r2, #12 ; 0xc
6f0: e51b3010 ldr r3, [fp, #-16]
6f4: e1a03da3 mov r3, r3, lsr #27
6f8: e2033001 and r3, r3, #1 ; 0x1
6fc: e5c23000 strb r3, [r2]
700: e89da808 ldmia sp, {r3, fp, sp, pc}

00000704 :
704: e1a0c00d mov ip, sp
708: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
70c: e24cb004 sub fp, ip, #4 ; 0x4
710: ebffffc2 bl 620
714: e3a0244e mov r2, #1308622848 ; 0x4e000000
718: e2822004 add r2, r2, #4 ; 0x4
71c: e3a0344e mov r3, #1308622848 ; 0x4e000000
720: e2833004 add r3, r3, #4 ; 0x4
724: e5933000 ldr r3, [r3]
728: e3c33002 bic r3, r3, #2 ; 0x2
72c: e5823000 str r3, [r2]
730: e3a000ff mov r0, #255 ; 0xff
734: ebffffc5 bl 650
738: ebffffb8 bl 620
73c: e89da800 ldmia sp, {fp, sp, pc}

00000740 :
740: e1a0c00d mov ip, sp
744: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
748: e24cb004 sub fp, ip, #4 ; 0x4
74c: e3a0344e mov r3, #1308622848 ; 0x4e000000
750: e2833010 add r3, r3, #16 ; 0x10
754: e5d33000 ldrb r3, [r3]
758: e20330ff and r3, r3, #255 ; 0xff
75c: e1a00003 mov r0, r3
760: e89da800 ldmia sp, {fp, sp, pc}

00000764 :
764: e1a0c00d mov ip, sp
768: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
76c: e24cb004 sub fp, ip, #4 ; 0x4
770: e3a02456 mov r2, #1442840576 ; 0x56000000
774: e2822060 add r2, r2, #96 ; 0x60
778: e3a03456 mov r3, #1442840576 ; 0x56000000
77c: e2833060 add r3, r3, #96 ; 0x60
780: e5933000 ldr r3, [r3]
784: e3c3333f bic r3, r3, #-67108864 ; 0xfc000000
788: e5823000 str r3, [r2]
78c: e3a0044e mov r0, #1308622848 ; 0x4e000000
790: e3a0344e mov r3, #1308622848 ; 0x4e000000
794: e3a0244e mov r2, #1308622848 ; 0x4e000000
798: e5931000 ldr r1, [r3]
79c: e5923000 ldr r3, [r2]
7a0: e1813003 orr r3, r1, r3
7a4: e3c32001 bic r2, r3, #1 ; 0x1
7a8: e3a0344e mov r3, #1308622848 ; 0x4e000000
7ac: e5933000 ldr r3, [r3]
7b0: e1823003 orr r3, r2, r3
7b4: e3833001 orr r3, r3, #1 ; 0x1
7b8: e5803000 str r3, [r0]
7bc: e3a0344e mov r3, #1308622848 ; 0x4e000000
7c0: e2833004 add r3, r3, #4 ; 0x4
7c4: e3a02073 mov r2, #115 ; 0x73
7c8: e5832000 str r2, [r3]
7cc: e3a0244e mov r2, #1308622848 ; 0x4e000000
7d0: e2822020 add r2, r2, #32 ; 0x20
7d4: e3a0344e mov r3, #1308622848 ; 0x4e000000
7d8: e2833020 add r3, r3, #32 ; 0x20
7dc: e5933000 ldr r3, [r3]
7e0: e3833004 orr r3, r3, #4 ; 0x4
7e4: e5823000 str r3, [r2]
7e8: e89da800 ldmia sp, {fp, sp, pc}

000007ec :
7ec: e1a0c00d mov ip, sp
7f0: e92dd800 s>真美妙b sp!, {fp, ip, lr, pc}
7f4: e24cb004 sub fp, ip, #4 ; 0x4
7f8: e24dd00c sub sp, sp, #12 ; 0xc
7fc: e50b0010 str r0, [fp, #-16]
800: e50b1014 str r1, [fp, #-20]
804: e3a03000 mov r3, #0 ; 0x0
808: e50b3018 str r3, [fp, #-24]
80c: e51b3010 ldr r3, [fp, #-16]
810: e5d32000 ldrb r2, [r3]
814: e51b3014 ldr r3, [fp, #-20]
818: e5d33000 ldrb r3, [r3]
81c: e0633002 r*** r3, r3, r2
820: e50b3018 str r3, [fp, #-24]
824: e3530000 cmp r3, #0 ; 0x0
828: 1a00000a bne 858
82c: e51b3014 ldr r3, [fp, #-20]
830: e5d33000 ldrb r3, [r3]
834: e3530000 cmp r3, #0 ; 0x0
838: 0a000006 beq 858
83c: e51b3010 ldr r3, [fp, #-16]
840: e2833001 add r3, r3, #1 ; 0x1
844: e50b3010 str r3, [fp, #-16]
848: e51b3014 ldr r3, [fp, #-20]
84c: e2833001 add r3, r3, #1 ; 0x1
850: e50b3014 str r3, [fp, #-20]
854: eaffffec b 80c
858: e51b3018 ldr r3, [fp, #-24]
85c: e3530000 cmp r3, #0 ; 0x0
860: aa000002 bge 870
864: e3e03000 mvn r3, #0 ; 0x0
868: e50b3018 str r3, [fp, #-24]
86c: ea000004 b 884
870: e51b3018 ldr r3, [fp, #-24]
874: e3530000 cmp r3, #0 ; 0x0
878: da000001 ble 884
87c: e3a03001 mov r3, #1 ; 0x1
880: e50b3018 str r3, [fp, #-24]
884: e51b3018 ldr r3, [fp, #-24]
888: e1a00003 mov r0, r3
88c: e24bd00c sub sp, fp, #12 ; 0xc
890: e89da800 ldmia sp, {fp, sp, pc}
Disassembly of section .rodata:

00000894 <.rodata>:
894: 23090a0d tstcs r9, #53248 ; 0xd000
898: 2a2a2a2a bcs a8b148
89c: 2a2a2a2a bcs a8b14c
8a0: 2a2a2a2a bcs a8b150
8a4: 2a2a2a2a bcs a8b154
8a8: 2a2a2a2a bcs a8b158
8ac: 2a2a2a2a bcs a8b15c
8b0: 2a2a2a2a bcs a8b160
8b4: 2a2a2a2a bcs a8b164
8b8: 2a2a2a2a bcs a8b168
8bc: 2a2a2a2a bcs a8b16c
8c0: 0a0d232a beq 349570
8c4: 20202309 eorcs r2, r0, r9, lsl #6
8c8: 20202020 eorcs r2, r0, r0, lsr #32
8cc: 20202020 eorcs r2, r0, r0, lsr #32
8d0: 20202020 eorcs r2, r0, r0, lsr #32
8d4: 74726175 ldrvcbt r6, [r2], #-373
8d8: 65706f20 ldrv*** r6, [r0, #-3872]!
8dc: 69746172 ldmvsdb r4!, {r1, r4, r5, r6, r8, sp, lr}^
8e0: 20206e6f eorcs r6, r0, pc, ror #28
8e4: 20202020 eorcs r2, r0, r0, lsr #32
8e8: 20202020 eorcs r2, r0, r0, lsr #32
8ec: 23202020 teqcs r0, #32 ; 0x20
8f0: 23090a0d tstcs r9, #53248 ; 0xd000
8f4: 2a2a2a2a bcs a8b1a4
8f8: 2a2a2a2a bcs a8b1a8
8fc: 2a2a2a2a bcs a8b1ac
900: 2a2a2a2a bcs a8b1b0
904: 2a2a2a2a bcs a8b1b4
908: 2a2a2a2a bcs a8b1b8
90c: 2a2a2a2a bcs a8b1bc
910: 2a2a2a2a bcs a8b1c0
914: 2a2a2a2a bcs a8b1c4
918: 2a2a2a2a bcs a8b1c8
91c: 0a0d232a beq 3495cc
920: 706e6909 r***vc r6, lr, r9, lsl #18
924: 73207475 teqvc r0, #1962934272 ; 0x75000000
928: 63656c65 cmnvs r5, #25856 ; 0x6500
92c: 00093a74 andeq r3, r9, r4, ror sl
Disassembly of section .comment:

00000000 <.comment>:
0: 43434700 cmpmi r3, #0 ; 0x0
4: 4728203a undefined
8: 2029554e eorcs r5, r9, lr, asr #10
c: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  10: 47000032 smladxmi r0, r2, r0, r0
  14: 203a4343 eorcss r4, sl, r3, asr #6
  18: 554e4728 strplb r4, [lr, #-1832]
  1c: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  20: 00322e34 eoreqs r2, r2, r4, lsr lr
  24: 43434700 cmpmi r3, #0 ; 0x0
  28: 4728203a undefined
  2c: 2029554e eorcs r5, r9, lr, asr #10
  30: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  34: 47000032 smladxmi r0, r2, r0, r0
  38: 203a4343 eorcss r4, sl, r3, asr #6
  3c: 554e4728 strplb r4, [lr, #-1832]
  40: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  44: 00322e34 eoreqs r2, r2, r4, lsr lr
  48: 43434700 cmpmi r3, #0 ; 0x0
  4c: 4728203a undefined
  50: 2029554e eorcs r5, r9, lr, asr #10
  54: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  58: 47000032 smladxmi r0, r2, r0, r0
  5c: 203a4343 eorcss r4, sl, r3, asr #6
  60: 554e4728 strplb r4, [lr, #-1832]
  64: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  68: 00322e34 eoreqs r2, r2, r4, lsr lr

高手帮我找找哪儿出问题了，感激不尽！

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