做一个简单的c入口函数
AREA INIT,CODE,READONLY
CODE32
ARM_MODE_SVC EQU 0x13
I_BIT EQU 0x80
F_BIT EQU 0x40
USR_Stack EQU 0x00203000
ENTRY
B InitReset ; 0x00 Reset handler
undefvec B undefvec ; 0x04 Undefined Instruction
swivec B swivec ; 0x08 Software Interrupt
pabtvec B pabtvec ; 0x0C Prefetch Abort
dabtvec B dabtvec ; 0x10 Data Abort
rsvdvec B rsvdvec ; 0x14 reserved
irqvec B irqvec ; 0x18 IRQ
fiqvec B fiqvec ; 0x1c FIQ
InitReset
MSR CPSR_c,#ARM_MODE_SVC| I_BIT | F_BIT ;改成用户模式且禁止IRQ和FIQ中断
LDR SP,=USR_Stack
IMPORT main
BL main
stop B stop
END
在ads中点调试，进入axd，一般情况下起始点是放在我的ENTRY B InitReset该条语句，但是我这个一进入axd就直接进入了反汇编界面，而且反汇编代码怪怪的,高手指点一下
反汇编代码：
__main [0xe28f8090] add r8,pc,#0x90 ; #0x98
00000004 [0xe898000f] ldmia r8,{r0-r3}
00000008 [0xe0800008] add r0,r0,r8
0000000c [0xe0811008] add r1,r1,r8
00000010 [0xe0822008] add r2,r2,r8
00000014 [0xe0833008] add r3,r3,r8
00000018 [0xe240b001] sub r11,r0,#1
0000001c [0xe242c001] sub r12,r2,#1
_move_region [0xe1500001] cmp r0,r1
00000024 [0x0a00000e] beq _zero_region
00000028 [0xe8b00070] ldmia r0!,{r4-r6}
0000002c [0xe1540005] cmp r4,r5
00000030 [0x0afffffa] beq _move_region
00000034 [0xe3140001] tst r4,#1
00000038 [0x1084400b] addne r4,r4,r11
0000003c [0xe3150001] tst r5,#1
00000040 [0x1085500b] addne r5,r5,r11
00000044 [0xe3150002] tst r5,#2
00000048 [0x10855009] addne r5,r5,r9
0000004c [0xe3c55003] bic r5,r5,#3
_move_loop [0xe2566004] subs r6,r6,#4
00000054 [0x24947004] ldrcs r7,[r4],#4
00000058 [0x24857004] strcs r7,[r5],#4
0000005c [0x8afffffb] bhi _move_loop
00000060 [0xeaffffee] b _move_region
_zero_region [0xe1520003] cmp r2,r3
00000068 [0x0b000028] bleq __rt_entry
0000006c [0xe3a07000] mov r7,#0
00000070 [0xe8b20030] ldmia r2!,{r4,r5}
00000074 [0xe3140001] tst r4,#1
00000078 [0x1084400c] addne r4,r4,r12
0000007c [0xe3140002] tst r4,#2
00000080 [0x10844009] addne r4,r4,r9
00000084 [0xe3c44003] bic r4,r4,#3
_zero_loop [0xe2555004] subs r5,r5,#4
0000008c [0x24847004] strcs r7,[r4],#4
00000090 [0x8afffffc] bhi _zero_loop
00000094 [0xeafffff2] b _zero_region
_region_table [0x00000374] dcd 0x00000374 t...
0000009c [0x00000398] dcd 0x00000398 ....
000000a0 [0x00000398] dcd 0x00000398 ....
000000a4 [0x000003b0] dcd 0x000003b0 ....
main [0xe59f2054] * ldr r2,0x00000104 ; = #0x00200000
000000ac [0xe3a00000] mov r0,#0
000000b0 [0xe5820000] str r0,[r2,#0]
000000b4 [0xe3a00000] mov r0,#0
000000b8 [0xe5921000] ldr r1,[r2,#0]
000000bc [0xe0811000] add r1,r1,r0
000000c0 [0xe5821000] str r1,[r2,#0]
000000c4 [0xe2800001] add r0,r0,#1
000000c8 [0xe3500002] cmp r0,#2
000000cc [0x9afffff9] bls 0xb8 ; (main + 0x10)
000000d0 [0xe3a00000] mov r0,#0
000000d4 [0xe1a0f00e] mov pc,r14
liu [0xe59f2024] ldr r2,0x00000104 ; = #0x00200000
000000dc [0xe3a00000] mov r0,#0
000000e0 [0xe5820000] str r0,[r2,#0]
000000e4 [0xe3a00000] mov r0,#0
000000e8 [0xe5921000] ldr r1,[r2,#0]
000000ec [0xe0811000] add r1,r1,r0
000000f0 [0xe5821000] str r1,[r2,#0]
000000f4 [0xe2800001] add r0,r0,#1
000000f8 [0xe3500002] cmp r0,#2
000000fc [0x9afffff9] bls 0xe8 ; (liu + 0x10)
00000100 [0xe1a0f00e] mov pc,r14
00000104 [0x00200000] dcd 0x00200000 .. .
_main_redirection [0xe1a0f00e] mov pc,r14
_main [0xe1a0f00e] mov pc,r14
__rt_entry [0xeb00004d] bl __rt_stackheap_init
00000114 [0xeb00000d] bl __rt_lib_init
00000118 [0xebffffe2] bl main
0000011c [0xea000005] b exit
__rt_exit [0xe92d4001] stmfd r13!,{r0,r14}
00000124 [0xeb000042] bl __rt_lib_shutdown
00000128 [0xe8bd4001] ldmfd r13!,{r0,r14}
0000012c [0xea000000] b __rt_abort1
__rt_abort [0xe3e00000] mvn r0,#0
__rt_abort1 [0xea000083] b _sys_exit
exit [0xe92d4010] stmfd r13!,{r4,r14}
0000013c [0xe1a04000] mov r4,r0
00000140 [0xebffffff] bl 0x144 ; (exit + 0xc)
00000144 [0xe1a00004] mov r0,r4
00000148 [0xe8bd4010] ldmfd r13!,{r4,r14}
0000014c [0xeafffff3] b __32__rt_exit
__rt_lib_init [0xe92d40f0] stmfd r13!,{r4-r7,r14}
00000154 [0xe24dd00c] sub r13,r13,#0xc
00000158 [0xe1a05001] mov r5,r1
0000015c [0xe1a04000] mov r4,r0
00000160 [0xeb0000a4] bl _fp_init
00000164 [0xe3a00000] mov r0,#0
00000168 [0xe58d4000] str r4,[r13,#0]
0000016c [0xe58d5004] str r5,[r13,#4]
00000170 [0xebffffff] bl 0x174 ; (__rt_lib_init + 0x24)
00000174 [0xe58d0008] str r0,[r13,#8]
00000178 [0xe59f00c8] ldr r0,0x00000248 ; = #0x000000c0
0000017c [0xe1a0100d] mov r1,r13
00000180 [0xe08f0000] add r0,pc,r0
00000184 [0xebffffff] bl 0x188 ; (__rt_lib_init + 0x38)
00000188 [0xe1a05000] mov r5,r0
0000018c [0xe1a06001] mov r6,r1
00000190 [0xe89d0003] ldmia r13,{r0,r1}
00000194 [0xebffffff] bl 0x198 ; (__rt_lib_init + 0x48)
00000198 [0xebffffff] bl 0x19c ; (__rt_lib_init + 0x4c)
0000019c [0xebffffff] bl 0x1a0 ; (__rt_lib_init + 0x50)
000001a0 [0xe3a01000] mov r1,#0
000001a4 [0xe3a00000] mov r0,#0
000001a8 [0xebffffff] bl 0x1ac ; (__rt_lib_init + 0x5c)
000001ac [0xe1a07000] mov r7,r0
000001b0 [0xeb00006a] bl __user_libspace
000001b4 [0xe1a04000] mov r4,r0
000001b8 [0xe5807020] str r7,[r0,#0x20]
000001bc [0xe3a00000] mov r0,#0
000001c0 [0xe3a01000] mov r1,#0
000001c4 [0xebffffff] bl 0x1c8 ; (__rt_lib_init + 0x78)
000001c8 [0xe2801001] add r1,r0,#1
000001cc [0xe5841024] str r1,[r4,#0x24]
000001d0 [0xe3a01000] mov r1,#0
000001d4 [0xe3a00000] mov r0,#0
000001d8 [0xebffffff] bl 0x1dc ; (__rt_lib_init + 0x8c)
000001dc [0xe5840028] str r0,[r4,#0x28]
000001e0 [0xe3a00000] mov r0,#0
000001e4 [0xe3a01000] mov r1,#0
000001e8 [0xebffffff] bl 0x1ec ; (__rt_lib_init + 0x9c)
000001ec [0xe584002c] str r0,[r4,#0x2c]
000001f0 [0xe3a00000] mov r0,#0
000001f4 [0xe3a01000] mov r1,#0
000001f8 [0xebffffff] bl 0x1fc ; (__rt_lib_init + 0xac)
000001fc [0xe5840030] str r0,[r4,#0x30]
00000200 [0xebffffff] bl 0x204 ; (__rt_lib_init + 0xb4)
00000204 [0xebffffff] bl 0x208 ; (__rt_lib_init + 0xb8)
00000208 [0xebffffff] bl 0x20c ; (__rt_lib_init + 0xbc)
0000020c [0xebffffff] bl 0x210 ; (__rt_lib_init + 0xc0)
00000210 [0xebffffff] bl 0x214 ; (__rt_lib_init + 0xc4)
00000214 [0xebffffff] bl 0x218 ; (__rt_lib_init + 0xc8)
00000218 [0xebffffff] bl 0x21c ; (__rt_lib_init + 0xcc)
0000021c [0xebffffff] bl 0x220 ; (__rt_lib_init + 0xd0)
00000220 [0xe1a00005] mov r0,r5
00000224 [0xe1a01006] mov r1,r6
00000228 [0xe28dd00c] add r13,r13,#0xc
0000022c [0xe8bd00f0] ldmfd r13!,{r4-r7}
00000230 [0xe49df004] ldr pc,[r13],#4
__rt_lib_shutdown [0xe92d4008] stmfd r13!,{r3,r14}
00000238 [0xebffffff] bl 0x23c ; (__rt_lib_shutdown + 0x8)
0000023c [0xebffffff] bl 0x240 ; (__rt_lib_shutdown + 0xc)
00000240 [0xebffffff] bl 0x244 ; (__rt_lib_shutdown + 0x10)
00000244 [0xe8bd8008] ldmfd r13!,{r3,pc}
00000248 [0x000000c0] dcd 0x000000c0 ....
__rt_stackheap_init [0xe1a0500e] mov r5,r14
00000250 [0xeb000042] bl __user_libspace
00000254 [0xe1a0e005] mov r14,r5
00000258 [0xe1a04000] mov r4,r0
0000025c [0xe1a0100d] mov r1,r13
00000260 [0xe1a0300a] mov r3,r10
00000264 [0xe3c00007] bic r0,r0,#7
00000268 [0xe280d060] add r13,r0,#0x60
0000026c [0xe92d4010] stmfd r13!,{r4,r14}
00000270 [0xeb00003d] bl __user_initial_stackheap
00000274 [0xe8bd4010] ldmfd r13!,{r4,r14}
00000278 [0xe3c1d007] bic r13,r1,#7
0000027c [0xe3a06000] mov r6,#0
00000280 [0xe3a07000] mov r7,#0
00000284 [0xe3a08000] mov r8,#0
00000288 [0xe3a0b000] mov r11,#0
0000028c [0xe1a0c004] mov r12,r4
00000290 [0xe8ac09c0] stmia r12!,{r6-r8,r11}
00000294 [0xe8ac09c0] stmia r12!,{r6-r8,r11}
00000298 [0xe8ac09c0] stmia r12!,{r6-r8,r11}
0000029c [0xe8ac09c0] stmia r12!,{r6-r8,r11}
000002a0 [0xe92d4013] stmfd r13!,{r0,r1,r4,r14}
000002a4 [0xe3a00000] mov r0,#0
000002a8 [0xe3a01000] mov r1,#0
000002ac [0xebffffff] bl 0x2b0 ; (__rt_stackheap_init + 0x64)
000002b0 [0xe2811040] add r1,r1,#0x40
000002b4 [0xe0802001] add r2,r0,r1
000002b8 [0xe2822f44] add r2,r2,#0x110
000002bc [0xe584201c] str r2,[r4,#0x1c]
000002c0 [0xe5841018] str r1,[r4,#0x18]
000002c4 [0xe3a00001] mov r0,#1
000002c8 [0xe5840010] str r0,[r4,#0x10]
000002cc [0xe8bd4013] ldmfd r13!,{r0,r1,r4,r14}
000002d0 [0xe5840014] str r0,[r4,#0x14]
000002d4 [0xe1a01000] mov r1,r0
000002d8 [0xe1a0f00e] mov pc,r14
__rt_heap_extend [0xe92d4010] stmfd r13!,{r4,r14}
000002e0 [0xe92d0003] stmfd r13!,{r0,r1}
000002e4 [0xeb00001d] bl __user_libspace
000002e8 [0xe1a04000] mov r4,r0
000002ec [0xe8bd0003] ldmfd r13!,{r0,r1}
000002f0 [0xe594301c] ldr r3,[r4,#0x1c]
000002f4 [0xe04d3003] sub r3,r13,r3
000002f8 [0xe5942014] ldr r2,[r4,#0x14]
000002fc [0xe5812000] str r2,[r1,#0]
00000300 [0xe082e000] add r14,r2,r0
00000304 [0xe15e0003] cmp r14,r3
00000308 [0x8a00000a] bhi _heap_overflow
0000030c [0xe093300e] adds r3,r3,r14
00000310 [0xe1a03063] mov r3,r3,rrx
00000314 [0xe3c33007] bic r3,r3,#7
00000318 [0xe28e1d40] add r1,r14,#0x1000
0000031c [0xe2811007] add r1,r1,#7
00000320 [0xe3c11007] bic r1,r1,#7
00000324 [0xe1510003] cmp r1,r3
00000328 [0x81a01003] movhi r1,r3
0000032c [0xe0410002] sub r0,r1,r2
00000330 [0xe5841014] str r1,[r4,#0x14]
00000334 [0xe8bd8010] ldmfd r13!,{r4,pc}
_heap_overflow [0xe1a02000] mov r2,r0
0000033c [0xe3a00000] mov r0,#0
00000340 [0xebffffff] bl 0x344 ; (_heap_overflow + 0xc)
00000344 [0xe8bd8010] ldmfd r13!,{r4,pc}
_sys_exit [0xe3a00018] mov r0,#0x18
0000034c [0xe59f1008] ldr r1,0x0000035c ; = #0x00020026
00000350 [0xef123456] swi 0x123456
00000354 [0xe1a0f00e] mov pc,r14
00000358 [0x00000058] dcd 0x00000058 X...
0000035c [0x00020026] dcd 0x00020026 &...
__user_libspace [0xe59f0000] ldr r0,0x00000368 ; = #0x00200004
00000364 [0xe1a0f00e] mov pc,r14
00000368 [0x00200004] dcd 0x00200004 .. .
__user_initial_stackheap [0xe92d4000] stmfd r13!,{r14}
00000370 [0xe24dd014] sub r13,r13,#0x14
00000374 [0xe1a0100d] mov r1,r13
00000378 [0xe28d2004] add r2,r13,#4
0000037c [0xe5812000] str r2,[r1,#0]
00000380 [0xe3a00016] mov r0,#0x16
00000384 [0xef123456] swi 0x123456
00000388 [0xe59d0004] ldr r0,[r13,#4]
0000038c [0xe59d100c] ldr r1,[r13,#0xc]
00000390 [0xe59d2008] ldr r2,[r13,#8]
00000394 [0xe59d3010] ldr r3,[r13,#0x10]
00000398 [0xe3500000] cmp r0,#0
0000039c [0x059f0008] ldreq r0,_RW_Limit ; = #_RW_Limit
000003a0 [0xe28dd014] add r13,r13,#0x14
000003a4 [0xe8bd8000] ldmfd r13!,{pc}
000003a8 [0x00000008] dcd 0x00000008 ....
_RW_Limit [0x00200064] dcd 0x00200064 d. .
__semihosting_swi_guard [0xe1a0f00e] mov pc,r14
__rt_fp_status_addr [0xe92d4010] stmfd r13!,{r4,r14}
000003b8 [0xebffffe8] bl __user_libspace
000003bc [0xe2800004] add r0,r0,#4
000003c0 [0xe8bd8010] ldmfd r13!,{r4,pc}
000003c4 [0xea000006] b InitReset
undefvec [0xeafffffe] b undefvec
swivec [0xeafffffe] b swivec
pabtvec [0xeafffffe] b pabtvec
dabtvec [0xeafffffe] b dabtvec
rsvdvec [0xeafffffe] b rsvdvec
irqvec [0xeafffffe] b irqvec
fiqvec [0xeafffffe] b fiqvec
InitReset [0xe321f0d3] msr cpsr_c,#0xd3
000003e8 [0xe59fd004] ldr r13,0x000003f4 ; = #0x00203000
000003ec [0xebffff2d] bl main
stop [0xeafffffe] b stop
000003f4 [0x00203000] dcd 0x00203000 .0 .
_fp_init [0xe92d4010] stmfd r13!,{r4,r14}
000003fc [0xebffffec] bl __rt_fp_status_addr
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