arm反汇编指令看程序跳转stcmi 0, cr0, [r0], {20}有大虾懂么

2013-5-7 21:13:00 5739 时钟

0 本帖最后由 dws.01@163.com 于 2013-5-7 21:16 编辑用arm-linux-objdump反汇编的代码，reset中断后执行设置设置栈，关看门狗，初始化时钟，这里遇到问题，即下面程序 3000009c: e59f304c ldr r3, [pc, #76] ; 300000f0 后应该跳到 300000f0: 4c000014 stcmi 0, cr0, [r0], {20}处，这句话看不懂高手指点完整代码： timer_elf: file format elf32-littlearm Disassembly of section .text: 30000000 <_start>: 30000000: ea000006 b 30000020 30000004 : 30000004: eafffffe b 30000004 30000008 : 30000008: eafffffe b 30000008 3000000c : 3000000c: eafffffe b 3000000c 30000010 : 30000010: eafffffe b 30000010 30000014 : 30000014: eafffffe b 30000014 30000018: ea000011 b 30000064 3000001c : 3000001c: eafffffe b 3000001c 30000020 : 30000020: e3a0da01 mov sp, #4096 ; 0x1000 30000024: eb000018 bl 3000008c 30000028: eb00001b bl 3000009c 3000002c: eb000036 bl 3000010c 30000030: eb00004d bl 3000016c 30000034: e59ff03c ldr pc, [pc, #60] ; 30000078 30000038 : 30000038: e321f0d2 msr CPSR_c, #210 ; 0xd2 3000003c: e3a0da01 mov sp, #4096 ; 0x1000 30000040: e321f0df msr CPSR_c, #223 ; 0xdf 30000044: e3a0d30d mov sp, #872415232 ; 0x34000000 30000048: eb000050 bl 30000190 3000004c: eb000054 bl 300001a4 30000050: eb000067 bl 300001f4 30000054: e321f05f msr CPSR_c, #95 ; 0x5f 30000058: e59fe01c ldr lr, [pc, #28] ; 3000007c 3000005c: e59ff01c ldr pc, [pc, #28] ; 30000080 30000060 : 30000060: eafffffe b 30000060 30000064 : 30000064: e24ee004 sub lr, lr, #4 ; 0x4 30000068: e92d5fff s>真美妙b sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip, lr} 3000006c: e59fe010 ldr lr, [pc, #16] ; 30000084 30000070: e59ff010 ldr pc, [pc, #16] ; 30000088 30000074 : 30000074: e8fd9fff ldmia sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip, pc}^ 30000078: 30000038 andcc r0, r0, r8, lsr r0 3000007c: 30000060 andcc r0, r0, r0, rrx 30000080: 3000025c andcc r0, r0, ip, asr r2 30000084: 30000074 andcc r0, r0, r4, ror r0 30000088: 3000020c andcc r0, r0, ip, lsl #4 3000008c : 3000008c: e3a02000 mov r2, #0 ; 0x0 30000090: e3a03453 mov r3, #1392508928 ; 0x53000000 30000094: e5832000 str r2, [r3] 30000098: e1a0f00e mov pc, lr 3000009c : 3000009c: e59f304c ldr r3, [pc, #76] ; 300000f0 300000a0: e3a02003 mov r2, #3 ; 0x3 300000a4: e5832000 str r2, [r3] 300000a8: ee111f10 mrc 15, 0, r1, cr1, cr0, {0} 300000ac: e3811103 orr r1, r1, #-1073741824 ; 0xc0000000 300000b0: ee011f10 mcr 15, 0, r1, cr1, cr0, {0} 300000b4: e59f1038 ldr r1, [pc, #56] ; 300000f4 300000b8: e59f3038 ldr r3, [pc, #56] ; 300000f8 300000bc: e5912000 ldr r2, [r1] 300000c0: e1520003 cmp r2, r3 300000c4: 0a000007 beq 300000e8 300000c8: e5912000 ldr r2, [r1] 300000cc: e59f3028 ldr r3, [pc, #40] ; 300000fc 300000d0: e1520003 cmp r2, r3 300000d4: 159f2024 ldrne r2, [pc, #36] ; 30000100 300000d8: 0a000002 beq 300000e8 300000dc: e59f3020 ldr r3, [pc, #32] ; 30000104 300000e0: e5832000 str r2, [r3] 300000e4: e1a0f00e mov pc, lr 300000e8: e59f2018 ldr r2, [pc, #24] ; 30000108 300000ec: eafffffa b 300000dc 300000f0: 4c000014 stcmi 0, cr0, [r0], {20} 300000f4: 560000b0 undefined 300000f8: 32410000 subcc r0, r1, #0 ; 0x0 300000fc: 32410002 subcc r0, r1, #2 ; 0x2 30000100: 0005c012 andeq ip, r5, r2, lsl r0 30000104: 4c000004 stcmi 0, cr0, [r0], {4} 30000108: 0005c040 andeq ip, r5, r0, asr #32 3000010c : 3000010c: e59f204c ldr r2, [pc, #76] ; 30000160 30000110: e3a03312 mov r3, #1207959552 ; 0x48000000 30000114: e5832000 str r2, [r3] 30000118: e3a01c07 mov r1, #1792 ; 0x700 3000011c: e59f0040 ldr r0, [pc, #64] ; 30000164 30000120: e59f2040 ldr r2, [pc, #64] ; 30000168 30000124: e5831004 str r1, [r3, #4] 30000128: e3a0c030 mov ip, #48 ; 0x30 3000012c: e5831008 str r1, [r3, #8] 30000130: e583100c str r1, [r3, #12] 30000134: e5831010 str r1, [r3, #16] 30000138: e5831014 str r1, [r3, #20] 3000013c: e5831018 str r1, [r3, #24] 30000140: e3a010b1 mov r1, #177 ; 0xb1 30000144: e583001c str r0, [r3, #28] 30000148: e5830020 str r0, [r3, #32] 3000014c: e5832024 str r2, [r3, #36] 30000150: e5831028 str r1, [r3, #40] 30000154: e583c02c str ip, [r3, #44] 30000158: e583c030 str ip, [r3, #48] 3000015c: e1a0f00e mov pc, lr 30000160: 22011110 andcs r1, r1, #4 ; 0x4 30000164: 00018005 andeq r8, r1, r5 30000168: 008c04f4 streqd r0, [ip], r4 3000016c : 3000016c: e59f0018 ldr r0, [pc, #24] ; 3000018c 30000170: e3a02000 mov r2, #0 ; 0x0 30000174: e3a01203 mov r1, #805306368 ; 0x30000000 30000178: e4923004 ldr r3, [r2], #4 3000017c: e1520000 cmp r2, r0 30000180: e4813004 str r3, [r1], #4 30000184: 9afffffb bls 30000178 30000188: e1a0f00e mov pc, lr 3000018c: 00000fff streqd r0, [r0], -pc 30000190 : 30000190: e59f3008 ldr r3, [pc, #8] ; 300001a0 30000194: e3a02b55 mov r2, #87040 ; 0x15400 30000198: e5832000 str r2, [r3] 3000019c: e1a0f00e mov pc, lr 300001a0: 56000010 undefined 300001a4 : 300001a4: e3a02063 mov r2, #99 ; 0x63 300001a8: e3a03451 mov r3, #1358954496 ; 0x51000000 300001ac: e5832000 str r2, [r3] 300001b0: e59f002c ldr r0, [pc, #44] ; 300001e4 300001b4: e59f302c ldr r3, [pc, #44] ; 300001e8 300001b8: e59f202c ldr r2, [pc, #44] ; 300001ec 300001bc: e59fc02c ldr ip, [pc, #44] ; 300001f0 300001c0: e3a01003 mov r1, #3 ; 0x3 300001c4: e5831000 str r1, [r3] 300001c8: e5820000 str r0, [r2] 300001cc: e59c3000 ldr r3, [ip] 300001d0: e3a02009 mov r2, #9 ; 0x9 300001d4: e3833002 orr r3, r3, #2 ; 0x2 300001d8: e58c3000 str r3, [ip] 300001dc: e58c2000 str r2, [ip] 300001e0: e1a0f00e mov pc, lr 300001e4: 00007a12 andeq r7, r0, r2, lsl sl 300001e8: 51000004 tstpl r0, r4 300001ec: 5100000c tstpl r0, ip 300001f0: 51000008 tstpl r0, r8 300001f4 : 300001f4: e59f200c ldr r2, [pc, #12] ; 30000208 300001f8: e5923000 ldr r3, [r2] 300001fc: e3c33b01 bic r3, r3, #1024 ; 0x400 30000200: e5823000 str r3, [r2] 30000204: e1a0f00e mov pc, lr 30000208: 4a000008 bmi 30000230 3000020c : 3000020c: e59f103c ldr r1, [pc, #60] ; 30000250 30000210: e59f203c ldr r2, [pc, #60] ; 30000254 30000214: e5913000 ldr r3, [r1] 30000218: e59f0038 ldr r0, [pc, #56] ; 30000258 3000021c: e353000a cmp r3, #10 ; 0xa 30000220: 05923000 ldreq r3, [r2] 30000224: 02033e1e andeq r3, r3, #480 ; 0x1e0 30000228: 01e03003 mvneq r3, r3 3000022c: 05823000 streq r3, [r2] 30000230: e5911000 ldr r1, [r1] 30000234: e3a03001 mov r3, #1 ; 0x1 30000238: e1a03113 mov r3, r3, lsl r1 3000023c: e3a0244a mov r2, #1241513984 ; 0x4a000000 30000240: e5823000 str r3, [r2] 30000244: e5901000 ldr r1, [r0] 30000248: e5801000 str r1, [r0] 3000024c: e1a0f00e mov pc, lr 30000250: 4a000014 bmi 300002a8 30000254: 56000014 undefined 30000258: 4a000010 bmi 300002a0 3000025c : 3000025c: eafffffe b 3000025c Disassembly of section .comment: 00000000 <.comment>: 0: 43434700 cmpmi r3, #0 ; 0x0 4: 4728203a undefined 8: 2029554e eorcs r5, r9, lr, asr #10 c: 2e332e33 mrccs 14, 1, r2, cr3, cr3, {1} 10: 47000032 undefined 14: 203a4343 eorcss r4, sl, r3, asr #6 18: 554e4728 strplb r4, [lr, -#1832] 1c: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1} 20: 00322e33 eoreqs r2, r2, r3, lsr lr 24: 43434700 cmpmi r3, #0 ; 0x0 28: 4728203a undefined 2c: 2029554e eorcs r5, r9, lr, asr #10 30: 2e332e33 mrccs 14, 1, r2, cr3, cr3, {1} 34: Address 0x34 is out of bounds. 0
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