티스토리 뷰
cc=
- softfloat : arm-linux-gnueabi-gcc (gcc 4.7.1 for arm)
- hardfloat : arm-linux-gnueabihf-gcc (gcc 4.7.1 for arm)
compile option =
- softfloat : -msoft-float
- hardfloat : -mhard-float
용량 차이 : 차이 없음
chanseok.kang@handel:~$ ls -al test* -rwxr-xr-x 1 chanseok.kang platform 8496 May 31 16:34 test -rwxr-xr-x 1 chanseok.kang platform 8496 May 31 16:34 test_hf
readelf -A시 정보 :
- test
chanseok.kang@handel:~$ arm-linux-gnueabi-readelf test -A Attribute Section: aeabi File Attributes Tag_CPU_name: "7-A" Tag_CPU_arch: v7 Tag_CPU_arch_profile: Application Tag_ARM_ISA_use: Yes Tag_THUMB_ISA_use: Thumb-2 Tag_FP_arch: VFPv3-D16 Tag_ABI_PCS_wchar_t: 4 Tag_ABI_FP_denormal: Needed Tag_ABI_FP_exceptions: Needed Tag_ABI_FP_number_model: IEEE 754 Tag_ABI_align_needed: 8-byte Tag_ABI_align_preserved: 8-byte, except leaf SP Tag_ABI_enum_size: int Tag_ABI_HardFP_use: SP and DP Tag_CPU_unaligned_access: v6
- test_hf
chanseok.kang@handel:~$ arm-linux-gnueabi-readelf test_hf -A Attribute Section: aeabi File Attributes Tag_CPU_name: "7-A" Tag_CPU_arch: v7 Tag_CPU_arch_profile: Application Tag_ARM_ISA_use: Yes Tag_THUMB_ISA_use: Thumb-2 Tag_FP_arch: VFPv3-D16 Tag_ABI_PCS_wchar_t: 4 Tag_ABI_FP_denormal: Needed Tag_ABI_FP_exceptions: Needed Tag_ABI_FP_number_model: IEEE 754 Tag_ABI_align_needed: 8-byte Tag_ABI_align_preserved: 8-byte, except leaf SP Tag_ABI_enum_size: int Tag_ABI_HardFP_use: SP and DP Tag_ABI_VFP_args: VFP registers Tag_CPU_unaligned_access: v6 Tag_DIV_use: Not allowed
objdump -d를 통해서 disassemble했을때 결과
- test
chanseok.kang@handel:~$ arm-linux-gnueabi-objdump test -d test: file format elf32-littlearm Disassembly of section .init: 000082e0 <_init>: 82e0: b508 push {r3, lr} 82e2: f000 f849 bl 8378 <call_gmon_start> 82e6: bf00 nop 82e8: bd08 pop {r3, pc} Disassembly of section .plt: 000082ec <.plt>: 82ec: e52de004 push {lr} ; (str lr, [sp, #-4]!) 82f0: e59fe004 ldr lr, [pc, #4] ; 82fc <_init+0x1c> 82f4: e08fe00e add lr, pc, lr 82f8: e5bef008 ldr pc, [lr, #8]! 82fc: 00008d04 .word 0x00008d04 8300: e28fc600 add ip, pc, #0 8304: e28cca08 add ip, ip, #32768 ; 0x8000 8308: e5bcfd04 ldr pc, [ip, #3332]! ; 0xd04 830c: e28fc600 add ip, pc, #0 8310: e28cca08 add ip, ip, #32768 ; 0x8000 8314: e5bcfcfc ldr pc, [ip, #3324]! ; 0xcfc 8318: e28fc600 add ip, pc, #0 831c: e28cca08 add ip, ip, #32768 ; 0x8000 8320: e5bcfcf4 ldr pc, [ip, #3316]! ; 0xcf4 8324: 4778 bx pc 8326: 46c0 nop ; (mov r8, r8) 8328: e28fc600 add ip, pc, #0 832c: e28cca08 add ip, ip, #32768 ; 0x8000 8330: e5bcfce8 ldr pc, [ip, #3304]! ; 0xce8 8334: e28fc600 add ip, pc, #0 8338: e28cca08 add ip, ip, #32768 ; 0x8000 833c: e5bcfce0 ldr pc, [ip, #3296]! ; 0xce0 Disassembly of section .text: 00008340 <_start>: 8340: f04f 0b00 mov.w fp, #0 8344: f04f 0e00 mov.w lr, #0 8348: f85d 1b04 ldr.w r1, [sp], #4 834c: 466a mov r2, sp 834e: f84d 2d04 str.w r2, [sp, #-4]! 8352: f84d 0d04 str.w r0, [sp, #-4]! 8356: f8df c014 ldr.w ip, [pc, #20] ; 836c <_start+0x2c> 835a: f84d cd04 str.w ip, [sp, #-4]! 835e: 4804 ldr r0, [pc, #16] ; (8370 <_start+0x30>) 8360: 4b04 ldr r3, [pc, #16] ; (8374 <_start+0x34>) 8362: f7ff efda blx 8318 <_init+0x38> 8366: f7ff efe6 blx 8334 <_init+0x54> 836a: 0000 .short 0x0000 836c: 00008815 .word 0x00008815 8370: 00008419 .word 0x00008419 8374: 000087d1 .word 0x000087d1 00008378 <call_gmon_start>: 8378: 4b03 ldr r3, [pc, #12] ; (8388 <call_gmon_start+0x10>) 837a: 4a04 ldr r2, [pc, #16] ; (838c <call_gmon_start+0x14>) 837c: 447b add r3, pc 837e: 589b ldr r3, [r3, r2] 8380: b10b cbz r3, 8386 <call_gmon_start+0xe> 8382: f7ff bfcf b.w 8324 <_init+0x44> 8386: 4770 bx lr 8388: 00008c80 .word 0x00008c80 838c: 00000020 .word 0x00000020 00008390 <deregister_tm_clones>: 8390: b508 push {r3, lr} 8392: 4805 ldr r0, [pc, #20] ; (83a8 <deregister_tm_clones+0x18>) 8394: 4b05 ldr r3, [pc, #20] ; (83ac <deregister_tm_clones+0x1c>) 8396: 1a1b subs r3, r3, r0 8398: 2b06 cmp r3, #6 839a: d800 bhi.n 839e <deregister_tm_clones+0xe> 839c: bd08 pop {r3, pc} 839e: 4b04 ldr r3, [pc, #16] ; (83b0 <deregister_tm_clones+0x20>) 83a0: 2b00 cmp r3, #0 83a2: d0fb beq.n 839c <deregister_tm_clones+0xc> 83a4: 4798 blx r3 83a6: e7f9 b.n 839c <deregister_tm_clones+0xc> 83a8: 0001102c .word 0x0001102c 83ac: 0001102f .word 0x0001102f 83b0: 00000000 .word 0x00000000 000083b4 <register_tm_clones>: 83b4: b508 push {r3, lr} 83b6: 4807 ldr r0, [pc, #28] ; (83d4 <register_tm_clones+0x20>) 83b8: 4b07 ldr r3, [pc, #28] ; (83d8 <register_tm_clones+0x24>) 83ba: 1a1b subs r3, r3, r0 83bc: 109b asrs r3, r3, #2 83be: eb03 73d3 add.w r3, r3, r3, lsr #31 83c2: 1059 asrs r1, r3, #1 83c4: d100 bne.n 83c8 <register_tm_clones+0x14> 83c6: bd08 pop {r3, pc} 83c8: 4a04 ldr r2, [pc, #16] ; (83dc <register_tm_clones+0x28>) 83ca: 2a00 cmp r2, #0 83cc: d0fb beq.n 83c6 <register_tm_clones+0x12> 83ce: 4790 blx r2 83d0: e7f9 b.n 83c6 <register_tm_clones+0x12> 83d2: bf00 nop 83d4: 0001102c .word 0x0001102c 83d8: 0001102c .word 0x0001102c 83dc: 00000000 .word 0x00000000 000083e0 <__do_global_dtors_aux>: 83e0: b510 push {r4, lr} 83e2: 4c04 ldr r4, [pc, #16] ; (83f4 <__do_global_dtors_aux+0x14>) 83e4: 7823 ldrb r3, [r4, #0] 83e6: b91b cbnz r3, 83f0 <__do_global_dtors_aux+0x10> 83e8: f7ff ffd2 bl 8390 <deregister_tm_clones> 83ec: 2301 movs r3, #1 83ee: 7023 strb r3, [r4, #0] 83f0: bd10 pop {r4, pc} 83f2: bf00 nop 83f4: 0001102c .word 0x0001102c 000083f8 <frame_dummy>: 83f8: 4805 ldr r0, [pc, #20] ; (8410 <frame_dummy+0x18>) 83fa: b508 push {r3, lr} 83fc: 6803 ldr r3, [r0, #0] 83fe: b113 cbz r3, 8406 <frame_dummy+0xe> 8400: 4b04 ldr r3, [pc, #16] ; (8414 <frame_dummy+0x1c>) 8402: b103 cbz r3, 8406 <frame_dummy+0xe> 8404: 4798 blx r3 8406: e8bd 4008 ldmia.w sp!, {r3, lr} 840a: f7ff bfd3 b.w 83b4 <register_tm_clones> 840e: bf00 nop 8410: 00010f14 .word 0x00010f14 8414: 00000000 .word 0x00000000 00008418 <main>: 8418: b580 push {r7, lr} 841a: b082 sub sp, #8 841c: af00 add r7, sp, #0 841e: 4b0f ldr r3, [pc, #60] ; (845c <main+0x44>) 8420: 607b str r3, [r7, #4] 8422: f648 0024 movw r0, #34852 ; 0x8824 8426: f2c0 0000 movt r0, #0 842a: f7ff ef70 blx 830c <_init+0x2c> 842e: f648 0034 movw r0, #34868 ; 0x8834 8432: f2c0 0000 movt r0, #0 8436: f7ff ef6a blx 830c <_init+0x2c> 843a: 6878 ldr r0, [r7, #4] 843c: f000 f974 bl 8728 <__aeabi_f2d> 8440: 4602 mov r2, r0 8442: 460b mov r3, r1 8444: f648 003c movw r0, #34876 ; 0x883c 8448: f2c0 0000 movt r0, #0 844c: f7ff ef58 blx 8300 <_init+0x20> 8450: 2300 movs r3, #0 8452: 4618 mov r0, r3 8454: f107 0708 add.w r7, r7, #8 8458: 46bd mov sp, r7 845a: bd80 pop {r7, pc} 845c: 4048f5c3 .word 0x4048f5c3 00008460 <__aeabi_drsub>: 8460: f081 4100 eor.w r1, r1, #2147483648 ; 0x80000000 8464: e002 b.n 846c <__adddf3> 8466: bf00 nop 00008468 <__aeabi_dsub>: 8468: f083 4300 eor.w r3, r3, #2147483648 ; 0x80000000 0000846c <__adddf3>: 846c: b530 push {r4, r5, lr} 846e: ea4f 0441 mov.w r4, r1, lsl #1 8472: ea4f 0543 mov.w r5, r3, lsl #1 8476: ea94 0f05 teq r4, r5 847a: bf08 it eq 847c: ea90 0f02 teqeq r0, r2 8480: bf1f itttt ne 8482: ea54 0c00 orrsne.w ip, r4, r0 8486: ea55 0c02 orrsne.w ip, r5, r2 848a: ea7f 5c64 mvnsne.w ip, r4, asr #21 848e: ea7f 5c65 mvnsne.w ip, r5, asr #21 8492: f000 80e2 beq.w 865a <__adddf3+0x1ee> 8496: ea4f 5454 mov.w r4, r4, lsr #21 849a: ebd4 5555 rsbs r5, r4, r5, lsr #21 849e: bfb8 it lt 84a0: 426d neglt r5, r5 84a2: dd0c ble.n 84be <__adddf3+0x52> 84a4: 442c add r4, r5 84a6: ea80 0202 eor.w r2, r0, r2 84aa: ea81 0303 eor.w r3, r1, r3 84ae: ea82 0000 eor.w r0, r2, r0 84b2: ea83 0101 eor.w r1, r3, r1 84b6: ea80 0202 eor.w r2, r0, r2 84ba: ea81 0303 eor.w r3, r1, r3 84be: 2d36 cmp r5, #54 ; 0x36 84c0: bf88 it hi 84c2: bd30 pophi {r4, r5, pc} 84c4: f011 4f00 tst.w r1, #2147483648 ; 0x80000000 84c8: ea4f 3101 mov.w r1, r1, lsl #12 84cc: f44f 1c80 mov.w ip, #1048576 ; 0x100000 84d0: ea4c 3111 orr.w r1, ip, r1, lsr #12 84d4: d002 beq.n 84dc <__adddf3+0x70> 84d6: 4240 negs r0, r0 84d8: eb61 0141 sbc.w r1, r1, r1, lsl #1 84dc: f013 4f00 tst.w r3, #2147483648 ; 0x80000000 84e0: ea4f 3303 mov.w r3, r3, lsl #12 84e4: ea4c 3313 orr.w r3, ip, r3, lsr #12 84e8: d002 beq.n 84f0 <__adddf3+0x84> 84ea: 4252 negs r2, r2 84ec: eb63 0343 sbc.w r3, r3, r3, lsl #1 84f0: ea94 0f05 teq r4, r5 84f4: f000 80a7 beq.w 8646 <__adddf3+0x1da> 84f8: f1a4 0401 sub.w r4, r4, #1 84fc: f1d5 0e20 rsbs lr, r5, #32 8500: db0d blt.n 851e <__adddf3+0xb2> 8502: fa02 fc0e lsl.w ip, r2, lr 8506: fa22 f205 lsr.w r2, r2, r5 850a: 1880 adds r0, r0, r2 850c: f141 0100 adc.w r1, r1, #0 8510: fa03 f20e lsl.w r2, r3, lr 8514: 1880 adds r0, r0, r2 8516: fa43 f305 asr.w r3, r3, r5 851a: 4159 adcs r1, r3 851c: e00e b.n 853c <__adddf3+0xd0> 851e: f1a5 0520 sub.w r5, r5, #32 8522: f10e 0e20 add.w lr, lr, #32 8526: 2a01 cmp r2, #1 8528: fa03 fc0e lsl.w ip, r3, lr 852c: bf28 it cs 852e: f04c 0c02 orrcs.w ip, ip, #2 8532: fa43 f305 asr.w r3, r3, r5 8536: 18c0 adds r0, r0, r3 8538: eb51 71e3 adcs.w r1, r1, r3, asr #31 853c: f001 4500 and.w r5, r1, #2147483648 ; 0x80000000 8540: d507 bpl.n 8552 <__adddf3+0xe6> 8542: f04f 0e00 mov.w lr, #0 8546: f1dc 0c00 rsbs ip, ip, #0 854a: eb7e 0000 sbcs.w r0, lr, r0 854e: eb6e 0101 sbc.w r1, lr, r1 8552: f5b1 1f80 cmp.w r1, #1048576 ; 0x100000 8556: d31b bcc.n 8590 <__adddf3+0x124> 8558: f5b1 1f00 cmp.w r1, #2097152 ; 0x200000 855c: d30c bcc.n 8578 <__adddf3+0x10c> 855e: 0849 lsrs r1, r1, #1 8560: ea5f 0030 movs.w r0, r0, rrx 8564: ea4f 0c3c mov.w ip, ip, rrx 8568: f104 0401 add.w r4, r4, #1 856c: ea4f 5244 mov.w r2, r4, lsl #21 8570: f512 0f80 cmn.w r2, #4194304 ; 0x400000 8574: f080 809a bcs.w 86ac <__adddf3+0x240> 8578: f1bc 4f00 cmp.w ip, #2147483648 ; 0x80000000 857c: bf08 it eq 857e: ea5f 0c50 movseq.w ip, r0, lsr #1 8582: f150 0000 adcs.w r0, r0, #0 8586: eb41 5104 adc.w r1, r1, r4, lsl #20 858a: ea41 0105 orr.w r1, r1, r5 858e: bd30 pop {r4, r5, pc} 8590: ea5f 0c4c movs.w ip, ip, lsl #1 8594: 4140 adcs r0, r0 8596: eb41 0101 adc.w r1, r1, r1 859a: f411 1f80 tst.w r1, #1048576 ; 0x100000 859e: f1a4 0401 sub.w r4, r4, #1 85a2: d1e9 bne.n 8578 <__adddf3+0x10c> 85a4: f091 0f00 teq r1, #0 85a8: bf04 itt eq 85aa: 4601 moveq r1, r0 85ac: 2000 moveq r0, #0 85ae: fab1 f381 clz r3, r1 85b2: bf08 it eq 85b4: 3320 addeq r3, #32 85b6: f1a3 030b sub.w r3, r3, #11 85ba: f1b3 0220 subs.w r2, r3, #32 85be: da0c bge.n 85da <__adddf3+0x16e> 85c0: 320c adds r2, #12 85c2: dd08 ble.n 85d6 <__adddf3+0x16a> 85c4: f102 0c14 add.w ip, r2, #20 85c8: f1c2 020c rsb r2, r2, #12 85cc: fa01 f00c lsl.w r0, r1, ip 85d0: fa21 f102 lsr.w r1, r1, r2 85d4: e00c b.n 85f0 <__adddf3+0x184> 85d6: f102 0214 add.w r2, r2, #20 85da: bfd8 it le 85dc: f1c2 0c20 rsble ip, r2, #32 85e0: fa01 f102 lsl.w r1, r1, r2 85e4: fa20 fc0c lsr.w ip, r0, ip 85e8: bfdc itt le 85ea: ea41 010c orrle.w r1, r1, ip 85ee: 4090 lslle r0, r2 85f0: 1ae4 subs r4, r4, r3 85f2: bfa2 ittt ge 85f4: eb01 5104 addge.w r1, r1, r4, lsl #20 85f8: 4329 orrge r1, r5 85fa: bd30 popge {r4, r5, pc} 85fc: ea6f 0404 mvn.w r4, r4 8600: 3c1f subs r4, #31 8602: da1c bge.n 863e <__adddf3+0x1d2> 8604: 340c adds r4, #12 8606: dc0e bgt.n 8626 <__adddf3+0x1ba> 8608: f104 0414 add.w r4, r4, #20 860c: f1c4 0220 rsb r2, r4, #32 8610: fa20 f004 lsr.w r0, r0, r4 8614: fa01 f302 lsl.w r3, r1, r2 8618: ea40 0003 orr.w r0, r0, r3 861c: fa21 f304 lsr.w r3, r1, r4 8620: ea45 0103 orr.w r1, r5, r3 8624: bd30 pop {r4, r5, pc} 8626: f1c4 040c rsb r4, r4, #12 862a: f1c4 0220 rsb r2, r4, #32 862e: fa20 f002 lsr.w r0, r0, r2 8632: fa01 f304 lsl.w r3, r1, r4 8636: ea40 0003 orr.w r0, r0, r3 863a: 4629 mov r1, r5 863c: bd30 pop {r4, r5, pc} 863e: fa21 f004 lsr.w r0, r1, r4 8642: 4629 mov r1, r5 8644: bd30 pop {r4, r5, pc} 8646: f094 0f00 teq r4, #0 864a: f483 1380 eor.w r3, r3, #1048576 ; 0x100000 864e: bf06 itte eq 8650: f481 1180 eoreq.w r1, r1, #1048576 ; 0x100000 8654: 3401 addeq r4, #1 8656: 3d01 subne r5, #1 8658: e74e b.n 84f8 <__adddf3+0x8c> 865a: ea7f 5c64 mvns.w ip, r4, asr #21 865e: bf18 it ne 8660: ea7f 5c65 mvnsne.w ip, r5, asr #21 8664: d029 beq.n 86ba <__adddf3+0x24e> 8666: ea94 0f05 teq r4, r5 866a: bf08 it eq 866c: ea90 0f02 teqeq r0, r2 8670: d005 beq.n 867e <__adddf3+0x212> 8672: ea54 0c00 orrs.w ip, r4, r0 8676: bf04 itt eq 8678: 4619 moveq r1, r3 867a: 4610 moveq r0, r2 867c: bd30 pop {r4, r5, pc} 867e: ea91 0f03 teq r1, r3 8682: bf1e ittt ne 8684: 2100 movne r1, #0 8686: 2000 movne r0, #0 8688: bd30 popne {r4, r5, pc} 868a: ea5f 5c54 movs.w ip, r4, lsr #21 868e: d105 bne.n 869c <__adddf3+0x230> 8690: 0040 lsls r0, r0, #1 8692: 4149 adcs r1, r1 8694: bf28 it cs 8696: f041 4100 orrcs.w r1, r1, #2147483648 ; 0x80000000 869a: bd30 pop {r4, r5, pc} 869c: f514 0480 adds.w r4, r4, #4194304 ; 0x400000 86a0: bf3c itt cc 86a2: f501 1180 addcc.w r1, r1, #1048576 ; 0x100000 86a6: bd30 popcc {r4, r5, pc} 86a8: f001 4500 and.w r5, r1, #2147483648 ; 0x80000000 86ac: f045 41fe orr.w r1, r5, #2130706432 ; 0x7f000000 86b0: f441 0170 orr.w r1, r1, #15728640 ; 0xf00000 86b4: f04f 0000 mov.w r0, #0 86b8: bd30 pop {r4, r5, pc} 86ba: ea7f 5c64 mvns.w ip, r4, asr #21 86be: bf1a itte ne 86c0: 4619 movne r1, r3 86c2: 4610 movne r0, r2 86c4: ea7f 5c65 mvnseq.w ip, r5, asr #21 86c8: bf1c itt ne 86ca: 460b movne r3, r1 86cc: 4602 movne r2, r0 86ce: ea50 3401 orrs.w r4, r0, r1, lsl #12 86d2: bf06 itte eq 86d4: ea52 3503 orrseq.w r5, r2, r3, lsl #12 86d8: ea91 0f03 teqeq r1, r3 86dc: f441 2100 orrne.w r1, r1, #524288 ; 0x80000 86e0: bd30 pop {r4, r5, pc} 86e2: bf00 nop 000086e4 <__aeabi_ui2d>: 86e4: f090 0f00 teq r0, #0 86e8: bf04 itt eq 86ea: 2100 moveq r1, #0 86ec: 4770 bxeq lr 86ee: b530 push {r4, r5, lr} 86f0: f44f 6480 mov.w r4, #1024 ; 0x400 86f4: f104 0432 add.w r4, r4, #50 ; 0x32 86f8: f04f 0500 mov.w r5, #0 86fc: f04f 0100 mov.w r1, #0 8700: e750 b.n 85a4 <__adddf3+0x138> 8702: bf00 nop 00008704 <__aeabi_i2d>: 8704: f090 0f00 teq r0, #0 8708: bf04 itt eq 870a: 2100 moveq r1, #0 870c: 4770 bxeq lr 870e: b530 push {r4, r5, lr} 8710: f44f 6480 mov.w r4, #1024 ; 0x400 8714: f104 0432 add.w r4, r4, #50 ; 0x32 8718: f010 4500 ands.w r5, r0, #2147483648 ; 0x80000000 871c: bf48 it mi 871e: 4240 negmi r0, r0 8720: f04f 0100 mov.w r1, #0 8724: e73e b.n 85a4 <__adddf3+0x138> 8726: bf00 nop 00008728 <__aeabi_f2d>: 8728: 0042 lsls r2, r0, #1 872a: ea4f 01e2 mov.w r1, r2, asr #3 872e: ea4f 0131 mov.w r1, r1, rrx 8732: ea4f 7002 mov.w r0, r2, lsl #28 8736: bf1f itttt ne 8738: f012 437f andsne.w r3, r2, #4278190080 ; 0xff000000 873c: f093 4f7f teqne r3, #4278190080 ; 0xff000000 8740: f081 5160 eorne.w r1, r1, #939524096 ; 0x38000000 8744: 4770 bxne lr 8746: f092 0f00 teq r2, #0 874a: bf14 ite ne 874c: f093 4f7f teqne r3, #4278190080 ; 0xff000000 8750: 4770 bxeq lr 8752: b530 push {r4, r5, lr} 8754: f44f 7460 mov.w r4, #896 ; 0x380 8758: f001 4500 and.w r5, r1, #2147483648 ; 0x80000000 875c: f021 4100 bic.w r1, r1, #2147483648 ; 0x80000000 8760: e720 b.n 85a4 <__adddf3+0x138> 8762: bf00 nop 00008764 <__aeabi_ul2d>: 8764: ea50 0201 orrs.w r2, r0, r1 8768: bf08 it eq 876a: 4770 bxeq lr 876c: b530 push {r4, r5, lr} 876e: f04f 0500 mov.w r5, #0 8772: e00a b.n 878a <__aeabi_l2d+0x16> 00008774 <__aeabi_l2d>: 8774: ea50 0201 orrs.w r2, r0, r1 8778: bf08 it eq 877a: 4770 bxeq lr 877c: b530 push {r4, r5, lr} 877e: f011 4500 ands.w r5, r1, #2147483648 ; 0x80000000 8782: d502 bpl.n 878a <__aeabi_l2d+0x16> 8784: 4240 negs r0, r0 8786: eb61 0141 sbc.w r1, r1, r1, lsl #1 878a: f44f 6480 mov.w r4, #1024 ; 0x400 878e: f104 0432 add.w r4, r4, #50 ; 0x32 8792: ea5f 5c91 movs.w ip, r1, lsr #22 8796: f43f aedc beq.w 8552 <__adddf3+0xe6> 879a: f04f 0203 mov.w r2, #3 879e: ea5f 0cdc movs.w ip, ip, lsr #3 87a2: bf18 it ne 87a4: 3203 addne r2, #3 87a6: ea5f 0cdc movs.w ip, ip, lsr #3 87aa: bf18 it ne 87ac: 3203 addne r2, #3 87ae: eb02 02dc add.w r2, r2, ip, lsr #3 87b2: f1c2 0320 rsb r3, r2, #32 87b6: fa00 fc03 lsl.w ip, r0, r3 87ba: fa20 f002 lsr.w r0, r0, r2 87be: fa01 fe03 lsl.w lr, r1, r3 87c2: ea40 000e orr.w r0, r0, lr 87c6: fa21 f102 lsr.w r1, r1, r2 87ca: 4414 add r4, r2 87cc: e6c1 b.n 8552 <__adddf3+0xe6> 87ce: bf00 nop 000087d0 <__libc_csu_init>: 87d0: e92d 43f8 stmdb sp!, {r3, r4, r5, r6, r7, r8, r9, lr} 87d4: 4606 mov r6, r0 87d6: 4d0d ldr r5, [pc, #52] ; (880c <__libc_csu_init+0x3c>) 87d8: 460f mov r7, r1 87da: f8df 9034 ldr.w r9, [pc, #52] ; 8810 <__libc_csu_init+0x40> 87de: 4690 mov r8, r2 87e0: 447d add r5, pc 87e2: f7ff fd7d bl 82e0 <_init> 87e6: 44f9 add r9, pc 87e8: ebc5 0909 rsb r9, r5, r9 87ec: ea5f 09a9 movs.w r9, r9, asr #2 87f0: d00a beq.n 8808 <__libc_csu_init+0x38> 87f2: 3d04 subs r5, #4 87f4: 2400 movs r4, #0 87f6: f855 3f04 ldr.w r3, [r5, #4]! 87fa: 4630 mov r0, r6 87fc: 4639 mov r1, r7 87fe: 4642 mov r2, r8 8800: 3401 adds r4, #1 8802: 4798 blx r3 8804: 454c cmp r4, r9 8806: d1f6 bne.n 87f6 <__libc_csu_init+0x26> 8808: e8bd 83f8 ldmia.w sp!, {r3, r4, r5, r6, r7, r8, r9, pc} 880c: 00008728 .word 0x00008728 8810: 00008726 .word 0x00008726 00008814 <__libc_csu_fini>: 8814: 4770 bx lr 8816: bf00 nop Disassembly of section .fini: 00008818 <_fini>: 8818: b508 push {r3, lr} 881a: bf00 nop 881c: bd08 pop {r3, pc}
- test_hf
chanseok.kang@handel:~$ arm-linux-gnueabi-objdump test_hf -d test_hf: file format elf32-littlearm Disassembly of section .init: 000082e8 <_init>: 82e8: b508 push {r3, lr} 82ea: f000 f849 bl 8380 <call_gmon_start> 82ee: bf00 nop 82f0: bd08 pop {r3, pc} Disassembly of section .plt: 000082f4 <.plt>: 82f4: e52de004 push {lr} ; (str lr, [sp, #-4]!) 82f8: e59fe004 ldr lr, [pc, #4] ; 8304 <_init+0x1c> 82fc: e08fe00e add lr, pc, lr 8300: e5bef008 ldr pc, [lr, #8]! 8304: 00008cfc .word 0x00008cfc 8308: e28fc600 add ip, pc, #0 830c: e28cca08 add ip, ip, #32768 ; 0x8000 8310: e5bcfcfc ldr pc, [ip, #3324]! ; 0xcfc 8314: e28fc600 add ip, pc, #0 8318: e28cca08 add ip, ip, #32768 ; 0x8000 831c: e5bcfcf4 ldr pc, [ip, #3316]! ; 0xcf4 8320: e28fc600 add ip, pc, #0 8324: e28cca08 add ip, ip, #32768 ; 0x8000 8328: e5bcfcec ldr pc, [ip, #3308]! ; 0xcec 832c: 4778 bx pc 832e: 46c0 nop ; (mov r8, r8) 8330: e28fc600 add ip, pc, #0 8334: e28cca08 add ip, ip, #32768 ; 0x8000 8338: e5bcfce0 ldr pc, [ip, #3296]! ; 0xce0 833c: e28fc600 add ip, pc, #0 8340: e28cca08 add ip, ip, #32768 ; 0x8000 8344: e5bcfcd8 ldr pc, [ip, #3288]! ; 0xcd8 Disassembly of section .text: 00008348 <_start>: 8348: f04f 0b00 mov.w fp, #0 834c: f04f 0e00 mov.w lr, #0 8350: f85d 1b04 ldr.w r1, [sp], #4 8354: 466a mov r2, sp 8356: f84d 2d04 str.w r2, [sp, #-4]! 835a: f84d 0d04 str.w r0, [sp, #-4]! 835e: f8df c014 ldr.w ip, [pc, #20] ; 8374 <_start+0x2c> 8362: f84d cd04 str.w ip, [sp, #-4]! 8366: 4804 ldr r0, [pc, #16] ; (8378 <_start+0x30>) 8368: 4b04 ldr r3, [pc, #16] ; (837c <_start+0x34>) 836a: f7ff efda blx 8320 <_init+0x38> 836e: f7ff efe6 blx 833c <_init+0x54> 8372: 0000 .short 0x0000 8374: 000084b1 .word 0x000084b1 8378: 00008421 .word 0x00008421 837c: 0000846d .word 0x0000846d 00008380 <call_gmon_start>: 8380: 4b03 ldr r3, [pc, #12] ; (8390 <call_gmon_start+0x10>) 8382: 4a04 ldr r2, [pc, #16] ; (8394 <call_gmon_start+0x14>) 8384: 447b add r3, pc 8386: 589b ldr r3, [r3, r2] 8388: b10b cbz r3, 838e <call_gmon_start+0xe> 838a: f7ff bfcf b.w 832c <_init+0x44> 838e: 4770 bx lr 8390: 00008c78 .word 0x00008c78 8394: 00000020 .word 0x00000020 00008398 <deregister_tm_clones>: 8398: b508 push {r3, lr} 839a: 4805 ldr r0, [pc, #20] ; (83b0 <deregister_tm_clones+0x18>) 839c: 4b05 ldr r3, [pc, #20] ; (83b4 <deregister_tm_clones+0x1c>) 839e: 1a1b subs r3, r3, r0 83a0: 2b06 cmp r3, #6 83a2: d800 bhi.n 83a6 <deregister_tm_clones+0xe> 83a4: bd08 pop {r3, pc} 83a6: 4b04 ldr r3, [pc, #16] ; (83b8 <deregister_tm_clones+0x20>) 83a8: 2b00 cmp r3, #0 83aa: d0fb beq.n 83a4 <deregister_tm_clones+0xc> 83ac: 4798 blx r3 83ae: e7f9 b.n 83a4 <deregister_tm_clones+0xc> 83b0: 0001102c .word 0x0001102c 83b4: 0001102f .word 0x0001102f 83b8: 00000000 .word 0x00000000 000083bc <register_tm_clones>: 83bc: b508 push {r3, lr} 83be: 4807 ldr r0, [pc, #28] ; (83dc <register_tm_clones+0x20>) 83c0: 4b07 ldr r3, [pc, #28] ; (83e0 <register_tm_clones+0x24>) 83c2: 1a1b subs r3, r3, r0 83c4: 109b asrs r3, r3, #2 83c6: eb03 73d3 add.w r3, r3, r3, lsr #31 83ca: 1059 asrs r1, r3, #1 83cc: d100 bne.n 83d0 <register_tm_clones+0x14> 83ce: bd08 pop {r3, pc} 83d0: 4a04 ldr r2, [pc, #16] ; (83e4 <register_tm_clones+0x28>) 83d2: 2a00 cmp r2, #0 83d4: d0fb beq.n 83ce <register_tm_clones+0x12> 83d6: 4790 blx r2 83d8: e7f9 b.n 83ce <register_tm_clones+0x12> 83da: bf00 nop 83dc: 0001102c .word 0x0001102c 83e0: 0001102c .word 0x0001102c 83e4: 00000000 .word 0x00000000 000083e8 <__do_global_dtors_aux>: 83e8: b510 push {r4, lr} 83ea: 4c04 ldr r4, [pc, #16] ; (83fc <__do_global_dtors_aux+0x14>) 83ec: 7823 ldrb r3, [r4, #0] 83ee: b91b cbnz r3, 83f8 <__do_global_dtors_aux+0x10> 83f0: f7ff ffd2 bl 8398 <deregister_tm_clones> 83f4: 2301 movs r3, #1 83f6: 7023 strb r3, [r4, #0] 83f8: bd10 pop {r4, pc} 83fa: bf00 nop 83fc: 0001102c .word 0x0001102c 00008400 <frame_dummy>: 8400: 4805 ldr r0, [pc, #20] ; (8418 <frame_dummy+0x18>) 8402: b508 push {r3, lr} 8404: 6803 ldr r3, [r0, #0] 8406: b113 cbz r3, 840e <frame_dummy+0xe> 8408: 4b04 ldr r3, [pc, #16] ; (841c <frame_dummy+0x1c>) 840a: b103 cbz r3, 840e <frame_dummy+0xe> 840c: 4798 blx r3 840e: e8bd 4008 ldmia.w sp!, {r3, lr} 8412: f7ff bfd3 b.w 83bc <register_tm_clones> 8416: bf00 nop 8418: 00010f14 .word 0x00010f14 841c: 00000000 .word 0x00000000 00008420 <main>: 8420: b580 push {r7, lr} 8422: b082 sub sp, #8 8424: af00 add r7, sp, #0 8426: 4b10 ldr r3, [pc, #64] ; (8468 <main+0x48>) 8428: 607b str r3, [r7, #4] 842a: f248 40c0 movw r0, #33984 ; 0x84c0 842e: f2c0 0000 movt r0, #0 8432: f7ff ef70 blx 8314 <_init+0x2c> 8436: f248 40d0 movw r0, #34000 ; 0x84d0 843a: f2c0 0000 movt r0, #0 843e: f7ff ef6a blx 8314 <_init+0x2c> 8442: edd7 7a01 vldr s15, [r7, #4] 8446: eeb7 7ae7 vcvt.f64.f32 d7, s15 844a: f248 40d8 movw r0, #34008 ; 0x84d8 844e: f2c0 0000 movt r0, #0 8452: ec53 2b17 vmov r2, r3, d7 8456: f7ff ef58 blx 8308 <_init+0x20> 845a: 2300 movs r3, #0 845c: 4618 mov r0, r3 845e: f107 0708 add.w r7, r7, #8 8462: 46bd mov sp, r7 8464: bd80 pop {r7, pc} 8466: bf00 nop 8468: 4048f5c3 .word 0x4048f5c3 0000846c <__libc_csu_init>: 846c: e92d 43f8 stmdb sp!, {r3, r4, r5, r6, r7, r8, r9, lr} 8470: 4606 mov r6, r0 8472: 4d0d ldr r5, [pc, #52] ; (84a8 <__libc_csu_init+0x3c>) 8474: 460f mov r7, r1 8476: f8df 9034 ldr.w r9, [pc, #52] ; 84ac <__libc_csu_init+0x40> 847a: 4690 mov r8, r2 847c: 447d add r5, pc 847e: f7ff ff33 bl 82e8 <_init> 8482: 44f9 add r9, pc 8484: ebc5 0909 rsb r9, r5, r9 8488: ea5f 09a9 movs.w r9, r9, asr #2 848c: d00a beq.n 84a4 <__libc_csu_init+0x38> 848e: 3d04 subs r5, #4 8490: 2400 movs r4, #0 8492: f855 3f04 ldr.w r3, [r5, #4]! 8496: 4630 mov r0, r6 8498: 4639 mov r1, r7 849a: 4642 mov r2, r8 849c: 3401 adds r4, #1 849e: 4798 blx r3 84a0: 454c cmp r4, r9 84a2: d1f6 bne.n 8492 <__libc_csu_init+0x26> 84a4: e8bd 83f8 ldmia.w sp!, {r3, r4, r5, r6, r7, r8, r9, pc} 84a8: 00008a8c .word 0x00008a8c 84ac: 00008a8a .word 0x00008a8a 000084b0 <__libc_csu_fini>: 84b0: 4770 bx lr 84b2: bf00 nop Disassembly of section .fini: 000084b4 <_fini>: 84b4: b508 push {r3, lr} 84b6: bf00 nop 84b8: bd08 pop {r3, pc}
결론 :
- soft-float를 사용하냐 hard-float을 사용하냐는 elf를 직접 까서 보지 않고는 거의 구별이 어렵다.
- hard-float을 사용하는 경우 arm에서는 architecture 내부에 있는 vfp (vector floating point) register를 사용한다.
- 보다시피 soft-float를 사용하는 경우는 gcc에서 compile시 연산 lib에 link를 걸고 이를 다룰수 있는 instruction으로 번역하기 때문에 assembly가 길어진다.
- float 연산을 하는 경우 linux에서는 /lib에 있는 libc.so의 도움을 받는다. 즉, 이게 없으면 libc 내에서 Illegal Instruction이라는 오류를 출력하며 수행되지 않는다.
의문 사항:
- 왜 readelf를 통해서 파일을 까봐도 soft-float compile 한 파일의 정보가 hard-float compile한 결과와 다르지 않을까... 특히 Tag_FP_arch 는 달라져야 할거 같은데, 실상 해보니까 차이가 없네..
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