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做一个简单的c入口函数<br /><br /> AREA INIT,CODE,READONLY<br /> CODE32<br /><br />ARM_MODE_SVC EQU 0x13<br />I_BIT EQU 0x80<br />F_BIT EQU 0x40<br />USR_Stack EQU 0x00203000<br /><br /> ENTRY<br /> <br /> B InitReset ; 0x00 Reset handler <br />undefvec B undefvec ; 0x04 Undefined Instruction <br />swivec B swivec ; 0x08 Software Interrupt <br />pabtvec B pabtvec ; 0x0C Prefetch Abort <br />dabtvec B dabtvec ; 0x10 Data Abort <br />rsvdvec B rsvdvec ; 0x14 reserved <br />irqvec B irqvec ; 0x18 IRQ <br />fiqvec B fiqvec ; 0x1c FIQ <br /><br /><br />InitReset <br /> MSR CPSR_c,#ARM_MODE_SVC| I_BIT | F_BIT ;改成用户模式且禁止IRQ和FIQ中断 <br /> LDR SP,=USR_Stack <br /> <br /> <br /> IMPORT main<br /> BL main<br /> <br /> <br />stop B stop <br /> <br /> <br /> END <br /><br />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<br />反汇编代码：<br />__main [0xe28f8090] add r8,pc,#0x90 ; #0x98<br />00000004 [0xe898000f] ldmia r8,{r0-r3}<br />00000008 [0xe0800008] add r0,r0,r8<br />0000000c [0xe0811008] add r1,r1,r8<br />00000010 [0xe0822008] add r2,r2,r8<br />00000014 [0xe0833008] add r3,r3,r8<br />00000018 [0xe240b001] sub r11,r0,#1<br />0000001c [0xe242c001] sub r12,r2,#1<br />_move_region [0xe1500001] cmp r0,r1<br />00000024 [0x0a00000e] beq _zero_region<br />00000028 [0xe8b00070] ldmia r0!,{r4-r6}<br />0000002c [0xe1540005] cmp r4,r5<br />00000030 [0x0afffffa] beq _move_region<br />00000034 [0xe3140001] tst r4,#1<br />00000038 [0x1084400b] addne r4,r4,r11<br />0000003c [0xe3150001] tst r5,#1<br />00000040 [0x1085500b] addne r5,r5,r11<br />00000044 [0xe3150002] tst r5,#2<br />00000048 [0x10855009] addne r5,r5,r9<br />0000004c [0xe3c55003] bic r5,r5,#3<br />_move_loop [0xe2566004] subs r6,r6,#4<br />00000054 [0x24947004] ldrcs r7,[r4],#4<br />00000058 [0x24857004] strcs r7,[r5],#4<br />0000005c [0x8afffffb] bhi _move_loop<br />00000060 [0xeaffffee] b _move_region<br />_zero_region [0xe1520003] cmp r2,r3<br />00000068 [0x0b000028] bleq __rt_entry<br />0000006c [0xe3a07000] mov r7,#0<br />00000070 [0xe8b20030] ldmia r2!,{r4,r5}<br />00000074 [0xe3140001] tst r4,#1<br />00000078 [0x1084400c] addne r4,r4,r12<br />0000007c [0xe3140002] tst r4,#2<br />00000080 [0x10844009] addne r4,r4,r9<br />00000084 [0xe3c44003] bic r4,r4,#3<br />_zero_loop [0xe2555004] subs r5,r5,#4<br />0000008c [0x24847004] strcs r7,[r4],#4<br />00000090 [0x8afffffc] bhi _zero_loop<br />00000094 [0xeafffff2] b _zero_region<br />_region_table [0x00000374] dcd 0x00000374 t...<br />0000009c [0x00000398] dcd 0x00000398 ....<br />000000a0 [0x00000398] dcd 0x00000398 ....<br />000000a4 [0x000003b0] dcd 0x000003b0 ....<br />main [0xe59f2054] * ldr r2,0x00000104 ; = #0x00200000<br />000000ac [0xe3a00000] mov r0,#0<br />000000b0 [0xe5820000] str r0,[r2,#0]<br />000000b4 [0xe3a00000] mov r0,#0<br />000000b8 [0xe5921000] ldr r1,[r2,#0]<br />000000bc [0xe0811000] add r1,r1,r0<br />000000c0 [0xe5821000] str r1,[r2,#0]<br />000000c4 [0xe2800001] add r0,r0,#1<br />000000c8 [0xe3500002] cmp r0,#2<br />000000cc [0x9afffff9] bls 0xb8 ; (main + 0x10)<br />000000d0 [0xe3a00000] mov r0,#0<br />000000d4 [0xe1a0f00e] mov pc,r14<br />liu [0xe59f2024] ldr r2,0x00000104 ; = #0x00200000<br />000000dc [0xe3a00000] mov r0,#0<br />000000e0 [0xe5820000] str r0,[r2,#0]<br />000000e4 [0xe3a00000] mov r0,#0<br />000000e8 [0xe5921000] ldr r1,[r2,#0]<br />000000ec [0xe0811000] add r1,r1,r0<br />000000f0 [0xe5821000] str r1,[r2,#0]<br />000000f4 [0xe2800001] add r0,r0,#1<br />000000f8 [0xe3500002] cmp r0,#2<br />000000fc [0x9afffff9] bls 0xe8 ; (liu + 0x10)<br />00000100 [0xe1a0f00e] mov pc,r14<br />00000104 [0x00200000] dcd 0x00200000 .. .<br />_main_redirection [0xe1a0f00e] mov pc,r14<br />_main [0xe1a0f00e] mov pc,r14<br />__rt_entry [0xeb00004d] bl __rt_stackheap_init<br />00000114 [0xeb00000d] bl __rt_lib_init<br />00000118 [0xebffffe2] bl main<br />0000011c [0xea000005] b exit<br />__rt_exit [0xe92d4001] stmfd r13!,{r0,r14}<br />00000124 [0xeb000042] bl __rt_lib_shutdown<br />00000128 [0xe8bd4001] ldmfd r13!,{r0,r14}<br />0000012c [0xea000000] b __rt_abort1<br />__rt_abort [0xe3e00000] mvn r0,#0<br />__rt_abort1 [0xea000083] b _sys_exit<br />exit [0xe92d4010] stmfd r13!,{r4,r14}<br />0000013c [0xe1a04000] mov r4,r0<br />00000140 [0xebffffff] bl 0x144 ; (exit + 0xc)<br />00000144 [0xe1a00004] mov r0,r4<br />00000148 [0xe8bd4010] ldmfd r13!,{r4,r14}<br />0000014c [0xeafffff3] b __32__rt_exit<br />__rt_lib_init [0xe92d40f0] stmfd r13!,{r4-r7,r14}<br />00000154 [0xe24dd00c] sub r13,r13,#0xc<br />00000158 [0xe1a05001] mov r5,r1<br />0000015c [0xe1a04000] mov r4,r0<br />00000160 [0xeb0000a4] bl _fp_init<br />00000164 [0xe3a00000] mov r0,#0<br />00000168 [0xe58d4000] str r4,[r13,#0]<br />0000016c [0xe58d5004] str r5,[r13,#4]<br />00000170 [0xebffffff] bl 0x174 ; (__rt_lib_init + 0x24)<br />00000174 [0xe58d0008] str r0,[r13,#8]<br />00000178 [0xe59f00c8] ldr r0,0x00000248 ; = #0x000000c0<br />0000017c [0xe1a0100d] mov r1,r13<br />00000180 [0xe08f0000] add r0,pc,r0<br />00000184 [0xebffffff] bl 0x188 ; (__rt_lib_init + 0x38)<br />00000188 [0xe1a05000] mov r5,r0<br />0000018c [0xe1a06001] mov r6,r1<br />00000190 [0xe89d0003] ldmia r13,{r0,r1}<br />00000194 [0xebffffff] bl 0x198 ; (__rt_lib_init + 0x48)<br />00000198 [0xebffffff] bl 0x19c ; (__rt_lib_init + 0x4c)<br />0000019c [0xebffffff] bl 0x1a0 ; (__rt_lib_init + 0x50)<br />000001a0 [0xe3a01000] mov r1,#0<br />000001a4 [0xe3a00000] mov r0,#0<br />000001a8 [0xebffffff] bl 0x1ac ; (__rt_lib_init + 0x5c)<br />000001ac [0xe1a07000] mov r7,r0<br />000001b0 [0xeb00006a] bl __user_libspace<br />000001b4 [0xe1a04000] mov r4,r0<br />000001b8 [0xe5807020] str r7,[r0,#0x20]<br />000001bc [0xe3a00000] mov r0,#0<br />000001c0 [0xe3a01000] mov r1,#0<br />000001c4 [0xebffffff] bl 0x1c8 ; (__rt_lib_init + 0x78)<br />000001c8 [0xe2801001] add r1,r0,#1<br />000001cc [0xe5841024] str r1,[r4,#0x24]<br />000001d0 [0xe3a01000] mov r1,#0<br />000001d4 [0xe3a00000] mov r0,#0<br />000001d8 [0xebffffff] bl 0x1dc ; (__rt_lib_init + 0x8c)<br />000001dc [0xe5840028] str r0,[r4,#0x28]<br />000001e0 [0xe3a00000] mov r0,#0<br />000001e4 [0xe3a01000] mov r1,#0<br />000001e8 [0xebffffff] bl 0x1ec ; (__rt_lib_init + 0x9c)<br />000001ec [0xe584002c] str r0,[r4,#0x2c]<br />000001f0 [0xe3a00000] mov r0,#0<br />000001f4 [0xe3a01000] mov r1,#0<br />000001f8 [0xebffffff] bl 0x1fc ; (__rt_lib_init + 0xac)<br />000001fc [0xe5840030] str r0,[r4,#0x30]<br />00000200 [0xebffffff] bl 0x204 ; (__rt_lib_init + 0xb4)<br />00000204 [0xebffffff] bl 0x208 ; (__rt_lib_init + 0xb8)<br />00000208 [0xebffffff] bl 0x20c ; (__rt_lib_init + 0xbc)<br />0000020c [0xebffffff] bl 0x210 ; (__rt_lib_init + 0xc0)<br />00000210 [0xebffffff] bl 0x214 ; (__rt_lib_init + 0xc4)<br />00000214 [0xebffffff] bl 0x218 ; (__rt_lib_init + 0xc8)<br />00000218 [0xebffffff] bl 0x21c ; (__rt_lib_init + 0xcc)<br />0000021c [0xebffffff] bl 0x220 ; (__rt_lib_init + 0xd0)<br />00000220 [0xe1a00005] mov r0,r5<br />00000224 [0xe1a01006] mov r1,r6<br />00000228 [0xe28dd00c] add r13,r13,#0xc<br />0000022c [0xe8bd00f0] ldmfd r13!,{r4-r7}<br />00000230 [0xe49df004] ldr pc,[r13],#4<br />__rt_lib_shutdown [0xe92d4008] stmfd r13!,{r3,r14}<br />00000238 [0xebffffff] bl 0x23c ; (__rt_lib_shutdown + 0x8)<br />0000023c [0xebffffff] bl 0x240 ; (__rt_lib_shutdown + 0xc)<br />00000240 [0xebffffff] bl 0x244 ; (__rt_lib_shutdown + 0x10)<br />00000244 [0xe8bd8008] ldmfd r13!,{r3,pc}<br />00000248 [0x000000c0] dcd 0x000000c0 ....<br />__rt_stackheap_init [0xe1a0500e] mov r5,r14<br />00000250 [0xeb000042] bl __user_libspace<br />00000254 [0xe1a0e005] mov r14,r5<br />00000258 [0xe1a04000] mov r4,r0<br />0000025c [0xe1a0100d] mov r1,r13<br />00000260 [0xe1a0300a] mov r3,r10<br />00000264 [0xe3c00007] bic r0,r0,#7<br />00000268 [0xe280d060] add r13,r0,#0x60<br />0000026c [0xe92d4010] stmfd r13!,{r4,r14}<br />00000270 [0xeb00003d] bl __user_initial_stackheap<br />00000274 [0xe8bd4010] ldmfd r13!,{r4,r14}<br />00000278 [0xe3c1d007] bic r13,r1,#7<br />0000027c [0xe3a06000] mov r6,#0<br />00000280 [0xe3a07000] mov r7,#0<br />00000284 [0xe3a08000] mov r8,#0<br />00000288 [0xe3a0b000] mov r11,#0<br />0000028c [0xe1a0c004] mov r12,r4<br />00000290 [0xe8ac09c0] stmia r12!,{r6-r8,r11}<br />00000294 [0xe8ac09c0] stmia r12!,{r6-r8,r11}<br />00000298 [0xe8ac09c0] stmia r12!,{r6-r8,r11}<br />0000029c [0xe8ac09c0] stmia r12!,{r6-r8,r11}<br />000002a0 [0xe92d4013] stmfd r13!,{r0,r1,r4,r14}<br />000002a4 [0xe3a00000] mov r0,#0<br />000002a8 [0xe3a01000] mov r1,#0<br />000002ac [0xebffffff] bl 0x2b0 ; (__rt_stackheap_init + 0x64)<br />000002b0 [0xe2811040] add r1,r1,#0x40<br />000002b4 [0xe0802001] add r2,r0,r1<br />000002b8 [0xe2822f44] add r2,r2,#0x110<br />000002bc [0xe584201c] str r2,[r4,#0x1c]<br />000002c0 [0xe5841018] str r1,[r4,#0x18]<br />000002c4 [0xe3a00001] mov r0,#1<br />000002c8 [0xe5840010] str r0,[r4,#0x10]<br />000002cc [0xe8bd4013] ldmfd r13!,{r0,r1,r4,r14}<br />000002d0 [0xe5840014] str r0,[r4,#0x14]<br />000002d4 [0xe1a01000] mov r1,r0<br />000002d8 [0xe1a0f00e] mov pc,r14<br />__rt_heap_extend [0xe92d4010] stmfd r13!,{r4,r14}<br />000002e0 [0xe92d0003] stmfd r13!,{r0,r1}<br />000002e4 [0xeb00001d] bl __user_libspace<br />000002e8 [0xe1a04000] mov r4,r0<br />000002ec [0xe8bd0003] ldmfd r13!,{r0,r1}<br />000002f0 [0xe594301c] ldr r3,[r4,#0x1c]<br />000002f4 [0xe04d3003] sub r3,r13,r3<br />000002f8 [0xe5942014] ldr r2,[r4,#0x14]<br />000002fc [0xe5812000] str r2,[r1,#0]<br />00000300 [0xe082e000] add r14,r2,r0<br />00000304 [0xe15e0003] cmp r14,r3<br />00000308 [0x8a00000a] bhi _heap_overflow<br />0000030c [0xe093300e] adds r3,r3,r14<br />00000310 [0xe1a03063] mov r3,r3,rrx<br />00000314 [0xe3c33007] bic r3,r3,#7<br />00000318 [0xe28e1d40] add r1,r14,#0x1000<br />0000031c [0xe2811007] add r1,r1,#7<br />00000320 [0xe3c11007] bic r1,r1,#7<br />00000324 [0xe1510003] cmp r1,r3<br />00000328 [0x81a01003] movhi r1,r3<br />0000032c [0xe0410002] sub r0,r1,r2<br />00000330 [0xe5841014] str r1,[r4,#0x14]<br />00000334 [0xe8bd8010] ldmfd r13!,{r4,pc}<br />_heap_overflow [0xe1a02000] mov r2,r0<br />0000033c [0xe3a00000] mov r0,#0<br />00000340 [0xebffffff] bl 0x344 ; (_heap_overflow + 0xc)<br />00000344 [0xe8bd8010] ldmfd r13!,{r4,pc}<br />_sys_exit [0xe3a00018] mov r0,#0x18<br />0000034c [0xe59f1008] ldr r1,0x0000035c ; = #0x00020026<br />00000350 [0xef123456] swi 0x123456<br />00000354 [0xe1a0f00e] mov pc,r14<br />00000358 [0x00000058] dcd 0x00000058 X...<br />0000035c [0x00020026] dcd 0x00020026 &...<br />__user_libspace [0xe59f0000] ldr r0,0x00000368 ; = #0x00200004<br />00000364 [0xe1a0f00e] mov pc,r14<br />00000368 [0x00200004] dcd 0x00200004 .. .<br />__user_initial_stackheap [0xe92d4000] stmfd r13!,{r14}<br />00000370 [0xe24dd014] sub r13,r13,#0x14<br />00000374 [0xe1a0100d] mov r1,r13<br />00000378 [0xe28d2004] add r2,r13,#4<br />0000037c [0xe5812000] str r2,[r1,#0]<br />00000380 [0xe3a00016] mov r0,#0x16<br />00000384 [0xef123456] swi 0x123456<br />00000388 [0xe59d0004] ldr r0,[r13,#4]<br />0000038c [0xe59d100c] ldr r1,[r13,#0xc]<br />00000390 [0xe59d2008] ldr r2,[r13,#8]<br />00000394 [0xe59d3010] ldr r3,[r13,#0x10]<br />00000398 [0xe3500000] cmp r0,#0<br />0000039c [0x059f0008] ldreq r0,_RW_Limit ; = #_RW_Limit<br />000003a0 [0xe28dd014] add r13,r13,#0x14<br />000003a4 [0xe8bd8000] ldmfd r13!,{pc}<br />000003a8 [0x00000008] dcd 0x00000008 ....<br />_RW_Limit [0x00200064] dcd 0x00200064 d. .<br />__semihosting_swi_guard [0xe1a0f00e] mov pc,r14<br />__rt_fp_status_addr [0xe92d4010] stmfd r13!,{r4,r14}<br />000003b8 [0xebffffe8] bl __user_libspace<br />000003bc [0xe2800004] add r0,r0,#4<br />000003c0 [0xe8bd8010] ldmfd r13!,{r4,pc}<br />000003c4 [0xea000006] b InitReset<br />undefvec [0xeafffffe] b undefvec<br />swivec [0xeafffffe] b swivec<br />pabtvec [0xeafffffe] b pabtvec<br />dabtvec [0xeafffffe] b dabtvec<br />rsvdvec [0xeafffffe] b rsvdvec<br />irqvec [0xeafffffe] b irqvec<br />fiqvec [0xeafffffe] b fiqvec<br />InitReset [0xe321f0d3] msr cpsr_c,#0xd3<br />000003e8 [0xe59fd004] ldr r13,0x000003f4 ; = #0x00203000<br />000003ec [0xebffff2d] bl main<br />stop [0xeafffffe] b stop<br />000003f4 [0x00203000] dcd 0x00203000 .0 .<br />_fp_init [0xe92d4010] stmfd r13!,{r4,r14}<br />000003fc [0xebffffec] bl __rt_fp_status_addr<br /> |
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楼主
发表于 2008-3-31 17:28
