https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66239
--- Comment #1 from Maciej Andrzejewski <maciej.andrzejewski at data dot pl> ---
It is getting even more interesting.
I have disassabled 4 binaries compiled with options:
1) -mfloat-abi=softfp
2) -mfloat-abi=softfp -O
3) -mfloat-abi=hard
4) -mfloat-abi=hard -O
and from what I understand if we turn ON the optimization the FPU is turned
OFF!
I dont see in assembler that FPU s** registers are used in those two cases
where optimization is turned on:
-- DISASSAMBLE OPTION 1 --
00010570 <main>:
10570: e92d4800 push {fp, lr}
10574: e28db004 add fp, sp, #4
10578: e24dd040 sub sp, sp, #64 ; 0x40
1057c: e3032333 movw r2, #13107 ; 0x3333
10580: e3432333 movt r2, #13107 ; 0x3333
10584: e3033333 movw r3, #13107 ; 0x3333
10588: e3443022 movt r3, #16418 ; 0x4022
1058c: e14b20fc strd r2, [fp, #-12]
10590: ed5b0b03 vldr d16, [fp, #-12]
10594: eef77be0 vcvt.f32.f64 s15, d16
10598: ee170a90 vmov r0, s15
1059c: ebffffa1 bl 10428 <sqrtf@plt>
105a0: ee070a90 vmov s15, r0
105a4: eef70ae7 vcvt.f64.f32 d16, s15
105a8: ed4b0b05 vstr d16, [fp, #-20] ; 0xffffffec
105ac: e30006cc movw r0, #1740 ; 0x6cc
105b0: e3400001 movt r0, #1
105b4: e14b21d4 ldrd r2, [fp, #-20] ; 0xffffffec
105b8: ebffffa0 bl 10440 <printf@plt>
105bc: e309399a movw r3, #39322 ; 0x999a
105c0: e3443111 movt r3, #16657 ; 0x4111
105c4: e50b3018 str r3, [fp, #-24] ; 0xffffffe8
105c8: e51b0018 ldr r0, [fp, #-24] ; 0xffffffe8
105cc: ebffff95 bl 10428 <sqrtf@plt>
105d0: ee070a90 vmov s15, r0
105d4: eef70ae7 vcvt.f64.f32 d16, s15
105d8: ed4b0b09 vstr d16, [fp, #-36] ; 0xffffffdc
105dc: e30006cc movw r0, #1740 ; 0x6cc
105e0: e3400001 movt r0, #1
105e4: e14b22d4 ldrd r2, [fp, #-36] ; 0xffffffdc
105e8: ebffff94 bl 10440 <printf@plt>
105ec: e3032333 movw r2, #13107 ; 0x3333
105f0: e3432333 movt r2, #13107 ; 0x3333
105f4: e3033333 movw r3, #13107 ; 0x3333
105f8: e3443022 movt r3, #16418 ; 0x4022
105fc: e14b22fc strd r2, [fp, #-44] ; 0xffffffd4
10600: e14b02dc ldrd r0, [fp, #-44] ; 0xffffffd4
10604: ebffff8a bl 10434 <sqrt@plt>
10608: e14b03f4 strd r0, [fp, #-52] ; 0xffffffcc
1060c: e30006cc movw r0, #1740 ; 0x6cc
10610: e3400001 movt r0, #1
10614: e14b23d4 ldrd r2, [fp, #-52] ; 0xffffffcc
10618: ebffff88 bl 10440 <printf@plt>
1061c: e309399a movw r3, #39322 ; 0x999a
10620: e3443111 movt r3, #16657 ; 0x4111
10624: e50b3038 str r3, [fp, #-56] ; 0xffffffc8
10628: ed5b7a0e vldr s15, [fp, #-56] ; 0xffffffc8
1062c: eef70ae7 vcvt.f64.f32 d16, s15
10630: ec510b30 vmov r0, r1, d16
10634: ebffff7e bl 10434 <sqrt@plt>
10638: e14b04f4 strd r0, [fp, #-68] ; 0xffffffbc
1063c: e30006cc movw r0, #1740 ; 0x6cc
10640: e3400001 movt r0, #1
10644: e14b24d4 ldrd r2, [fp, #-68] ; 0xffffffbc
10648: ebffff7c bl 10440 <printf@plt>
1064c: e3a03000 mov r3, #0
10650: e1a00003 mov r0, r3
10654: e24bd004 sub sp, fp, #4
10658: e8bd8800 pop {fp, pc}
-- DISASSAMBLE OPTION 1 --
-- DISASSAMBLE OPTION 2 --
000104f4 <main>:
104f4: e92d40d0 push {r4, r6, r7, lr}
104f8: e30045d4 movw r4, #1492 ; 0x5d4
104fc: e3404001 movt r4, #1
10500: e3a06000 mov r6, #0
10504: e302720a movw r7, #8714 ; 0x220a
10508: e3447008 movt r7, #16392 ; 0x4008
1050c: e1a00004 mov r0, r4
10510: e1a02006 mov r2, r6
10514: e1a03007 mov r3, r7
10518: ebffffa9 bl 103c4 <printf@plt>
1051c: e1a00004 mov r0, r4
10520: e1a02006 mov r2, r6
10524: e1a03007 mov r3, r7
10528: ebffffa5 bl 103c4 <printf@plt>
1052c: e1a00004 mov r0, r4
10530: e30f2d38 movw r2, #64824 ; 0xfd38
10534: e34f2ea1 movt r2, #65185 ; 0xfea1
10538: e3023209 movw r3, #8713 ; 0x2209
1053c: e3443008 movt r3, #16392 ; 0x4008
10540: ebffff9f bl 103c4 <printf@plt>
10544: e1a00004 mov r0, r4
10548: e3072c82 movw r2, #31874 ; 0x7c82
1054c: e340271e movt r2, #1822 ; 0x71e
10550: e302320a movw r3, #8714 ; 0x220a
10554: e3443008 movt r3, #16392 ; 0x4008
10558: ebffff99 bl 103c4 <printf@plt>
1055c: e3a00000 mov r0, #0
10560: e8bd80d0 pop {r4, r6, r7, pc}
-- DISASSAMBLE OPTION 2 --
-- DISASSAMBLE OPTION 3 --
00008578 <main>:
8578: e92d4800 push {fp, lr}
857c: e28db004 add fp, sp, #4
8580: e24dd040 sub sp, sp, #64 ; 0x40
8584: e3032333 movw r2, #13107 ; 0x3333
8588: e3432333 movt r2, #13107 ; 0x3333
858c: e3033333 movw r3, #13107 ; 0x3333
8590: e3443022 movt r3, #16418 ; 0x4022
8594: e14b20fc strd r2, [fp, #-12]
8598: ed5b0b03 vldr d16, [fp, #-12]
859c: eef77be0 vcvt.f32.f64 s15, d16
85a0: eeb00a67 vmov.f32 s0, s15
85a4: ebffffa1 bl 8430 <_init+0x44>
85a8: eef07a40 vmov.f32 s15, s0
85ac: eef70ae7 vcvt.f64.f32 d16, s15
85b0: ed4b0b05 vstr d16, [fp, #-20] ; 0xffffffec
85b4: e30806d4 movw r0, #34516 ; 0x86d4
85b8: e3400000 movt r0, #0
85bc: e14b21d4 ldrd r2, [fp, #-20] ; 0xffffffec
85c0: ebffffa0 bl 8448 <_init+0x5c>
85c4: e309399a movw r3, #39322 ; 0x999a
85c8: e3443111 movt r3, #16657 ; 0x4111
85cc: e50b3018 str r3, [fp, #-24]
85d0: ed1b0a06 vldr s0, [fp, #-24] ; 0xffffffe8
85d4: ebffff95 bl 8430 <_init+0x44>
85d8: eef07a40 vmov.f32 s15, s0
85dc: eef70ae7 vcvt.f64.f32 d16, s15
85e0: ed4b0b09 vstr d16, [fp, #-36] ; 0xffffffdc
85e4: e30806d4 movw r0, #34516 ; 0x86d4
85e8: e3400000 movt r0, #0
85ec: e14b22d4 ldrd r2, [fp, #-36] ; 0xffffffdc
85f0: ebffff94 bl 8448 <_init+0x5c>
85f4: e3032333 movw r2, #13107 ; 0x3333
85f8: e3432333 movt r2, #13107 ; 0x3333
85fc: e3033333 movw r3, #13107 ; 0x3333
8600: e3443022 movt r3, #16418 ; 0x4022
8604: e14b22fc strd r2, [fp, #-44] ; 0xffffffd4
8608: ed1b0b0b vldr d0, [fp, #-44] ; 0xffffffd4
860c: ebffff8a bl 843c <_init+0x50>
8610: ed0b0b0d vstr d0, [fp, #-52] ; 0xffffffcc
8614: e30806d4 movw r0, #34516 ; 0x86d4
8618: e3400000 movt r0, #0
861c: e14b23d4 ldrd r2, [fp, #-52] ; 0xffffffcc
8620: ebffff88 bl 8448 <_init+0x5c>
8624: e309399a movw r3, #39322 ; 0x999a
8628: e3443111 movt r3, #16657 ; 0x4111
862c: e50b3038 str r3, [fp, #-56] ; 0x38
8630: ed5b7a0e vldr s15, [fp, #-56] ; 0xffffffc8
8634: eef70ae7 vcvt.f64.f32 d16, s15
8638: eeb00b60 vmov.f64 d0, d16
863c: ebffff7e bl 843c <_init+0x50>
8640: ed0b0b11 vstr d0, [fp, #-68] ; 0xffffffbc
8644: e30806d4 movw r0, #34516 ; 0x86d4
8648: e3400000 movt r0, #0
864c: e14b24d4 ldrd r2, [fp, #-68] ; 0xffffffbc
8650: ebffff7c bl 8448 <_init+0x5c>
8654: e3a03000 mov r3, #0
8658: e1a00003 mov r0, r3
865c: e24bd004 sub sp, fp, #4
8660: e8bd8800 pop {fp, pc}
-- DISASSAMBLE OPTION 3 --
-- DISASSAMBLE OPTION 4 --
000084fc <main>:
84fc: e92d40d0 push {r4, r6, r7, lr}
8500: e30845dc movw r4, #34268 ; 0x85dc
8504: e3404000 movt r4, #0
8508: e3a06000 mov r6, #0
850c: e302720a movw r7, #8714 ; 0x220a
8510: e3447008 movt r7, #16392 ; 0x4008
8514: e1a00004 mov r0, r4
8518: e1a02006 mov r2, r6
851c: e1a03007 mov r3, r7
8520: ebffffa9 bl 83cc <_init+0x44>
8524: e1a00004 mov r0, r4
8528: e1a02006 mov r2, r6
852c: e1a03007 mov r3, r7
8530: ebffffa5 bl 83cc <_init+0x44>
8534: e1a00004 mov r0, r4
8538: e30f2d38 movw r2, #64824 ; 0xfd38
853c: e34f2ea1 movt r2, #65185 ; 0xfea1
8540: e3023209 movw r3, #8713 ; 0x2209
8544: e3443008 movt r3, #16392 ; 0x4008
8548: ebffff9f bl 83cc <_init+0x44>
854c: e1a00004 mov r0, r4
8550: e3072c82 movw r2, #31874 ; 0x7c82
8554: e340271e movt r2, #1822 ; 0x71e
8558: e302320a movw r3, #8714 ; 0x220a
855c: e3443008 movt r3, #16392 ; 0x4008
8560: ebffff99 bl 83cc <_init+0x44>
8564: e3a00000 mov r0, #0
8568: e8bd80d0 pop {r4, r6, r7, pc}
-- DISASSAMBLE OPTION 4 --
(In reply to Maciej Andrzejewski from comment #0)
> Tested both on GCC 4.9.1 (compiled toolchain using crosstool-ng) and 4.9.2
> (compiled toolchain using buildroot).
>
> Simple code:
>
> -- CODE --
> #include <stdio.h>
> #include <cmath>
> #include <math.h>
>
>
> int main( void )
> {
> double sq3 = 9.1;
> double ret3 = sqrtf(sq3);
> printf("%f\n", ret3);
>
> float sq4 = 9.1;
> double ret4 = sqrtf(sq4);
> printf("%f\n", ret4);
>
> double sq1 = 9.1;
> double ret1 = sqrt(sq1);
> printf("%f\n", ret1);
>
> float sq2 = 9.1;
> double ret2 = sqrt(sq2);
> printf("%f\n", ret2);
>
> return 0;
> }
> -- CODE --
>
> compiled with command:
> g++ -mcpu=cortex-a8 -march=armv7-a -mtune=cortex-a8 -mfpu=neon
> -mthumb-interwork -mfpu=neon -Wall -Wextra -mfloat-abi=softfp
>
> or
>
> g++ -mcpu=cortex-a8 -march=armv7-a -mtune=cortex-a8 -mfpu=neon
> -mthumb-interwork -mfpu=neon -Wall -Wextra -mfloat-abi=soft
>
> prints output when run:
> -- OUTPUT --
> 0.000000
> 0.000000
> 89884613882771507935772421602449274280826426490922860415370742828850803088708
> 43656890933893326861538272573183614877997670352187692139688355386197138142676
> 33945847309741616433412271681163246268102419739642257742722331754068434663711
> 41886318608237834273423597057507238373804952327520531541920130815989439791104
> .000000
> 89884613882771507935772421602449274280826426490922860415370742828850803088708
> 43656890933893326861538272573183614877997670352187692139688355386197138142676
> 33945847309741616433412271681163246268102419739642257742722331754068434663711
> 41886318608237834273423597057507238373804952327520531541920130815989439791104
> .000000
> -- OUTPUT --
>
> when compiled with added ANY optimization flag (O, O1, O2, O3, Og) prints
> proper output:
> -- OUTPUT 2 --
> 3.016621
> 3.016621
> 3.016621
> 3.016621
> -- OUTPUT 2 --
>
>
>
>
> *** Additional info ***
>
> g++ --version:
> arm-none-linux-gnueabi-g++ (Buildroot 2015.02) 4.9.2
>
> readelf -a a.out:
> -- READELF --
> macieja@ubuntu:~/Projects/sqrtf$ readelf -a a.out
> ELF Header:
> Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
> Class: ELF32
> Data: 2's complement, little endian
> Version: 1 (current)
> OS/ABI: UNIX - System V
> ABI Version: 0
> Type: EXEC (Executable file)
> Machine: ARM
> Version: 0x1
> Entry point address: 0x103d0
> Start of program headers: 52 (bytes into file)
> Start of section headers: 5012 (bytes into file)
> Flags: 0x5000202, has entry point, Version5
> EABI, soft-float ABI
> Size of this header: 52 (bytes)
> Size of program headers: 32 (bytes)
> Number of program headers: 8
> Size of section headers: 40 (bytes)
> Number of section headers: 29
> Section header string table index: 26
>
> Section Headers:
> [Nr] Name Type Addr Off Size ES Flg Lk
> Inf Al
> [ 0] NULL 00000000 000000 000000 00 0
> 0 0
> [ 1] .interp PROGBITS 00010134 000134 000013 00 A 0
> 0 1
> [ 2] .note.ABI-tag NOTE 00010148 000148 000020 00 A 0
> 0 4
> [ 3] .hash HASH 00010168 000168 000038 04 A 4
> 0 4
> [ 4] .dynsym DYNSYM 000101a0 0001a0 000090 10 A 5
> 1 4
> [ 5] .dynstr STRTAB 00010230 000230 0000d3 00 A 0
> 0 1
> [ 6] .gnu.version VERSYM 00010304 000304 000012 02 A 4
> 0 2
> [ 7] .gnu.version_r VERNEED 00010318 000318 000040 00 A 5
> 2 4
> [ 8] .rel.dyn REL 00010358 000358 000008 08 A 4
> 0 4
> [ 9] .rel.plt REL 00010360 000360 000020 08 AI 4
> 11 4
> [10] .init PROGBITS 00010380 000380 00000c 00 AX 0
> 0 4
> [11] .plt PROGBITS 0001038c 00038c 000044 04 AX 0
> 0 4
> [12] .text PROGBITS 000103d0 0003d0 0001f8 00 AX 0
> 0 4
> [13] .fini PROGBITS 000105c8 0005c8 000008 00 AX 0
> 0 4
> [14] .rodata PROGBITS 000105d0 0005d0 000008 00 A 0
> 0 4
> [15] .ARM.exidx ARM_EXIDX 000105d8 0005d8 000018 00 AL 12
> 0 4
> [16] .eh_frame PROGBITS 000105f0 0005f0 000004 00 A 0
> 0 4
> [17] .init_array INIT_ARRAY 000205f4 0005f4 000004 00 WA 0
> 0 4
> [18] .fini_array FINI_ARRAY 000205f8 0005f8 000004 00 WA 0
> 0 4
> [19] .jcr PROGBITS 000205fc 0005fc 000004 00 WA 0
> 0 4
> [20] .dynamic DYNAMIC 00020600 000600 000100 08 WA 5
> 0 4
> [21] .got PROGBITS 00020700 000700 000020 04 WA 0
> 0 4
> [22] .data PROGBITS 00020720 000720 000008 00 WA 0
> 0 4
> [23] .bss NOBITS 00020728 000728 000004 00 WA 0
> 0 1
> [24] .comment PROGBITS 00000000 000728 00001f 01 MS 0
> 0 1
> [25] .ARM.attributes ARM_ATTRIBUTES 00000000 000747 000037 00 0
> 0 1
> [26] .shstrtab STRTAB 00000000 00077e 0000f3 00 0
> 0 1
> [27] .symtab SYMTAB 00000000 000874 000700 10 28
> 86 4
> [28] .strtab STRTAB 00000000 000f74 00041e 00 0
> 0 1
> Key to Flags:
> W (write), A (alloc), X (execute), M (merge), S (strings)
> I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
> O (extra OS processing required) o (OS specific), p (processor specific)
>
> There are no section groups in this file.
>
> Program Headers:
> Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
> EXIDX 0x0005d8 0x000105d8 0x000105d8 0x00018 0x00018 R 0x4
> PHDR 0x000034 0x00010034 0x00010034 0x00100 0x00100 R E 0x4
> INTERP 0x000134 0x00010134 0x00010134 0x00013 0x00013 R 0x1
> [Requesting program interpreter: /lib/ld-linux.so.3]
> LOAD 0x000000 0x00010000 0x00010000 0x005f4 0x005f4 R E 0x10000
> LOAD 0x0005f4 0x000205f4 0x000205f4 0x00134 0x00138 RW 0x10000
> DYNAMIC 0x000600 0x00020600 0x00020600 0x00100 0x00100 RW 0x4
> NOTE 0x000148 0x00010148 0x00010148 0x00020 0x00020 R 0x4
> GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x10
>
> Section to Segment mapping:
> Segment Sections...
> 00 .ARM.exidx
> 01
> 02 .interp
> 03 .interp .note.ABI-tag .hash .dynsym .dynstr .gnu.version
> .gnu.version_r .rel.dyn .rel.plt .init .plt .text .fini .rodata .ARM.exidx
> .eh_frame
> 04 .init_array .fini_array .jcr .dynamic .got .data .bss
> 05 .dynamic
> 06 .note.ABI-tag
> 07
>
> Dynamic section at offset 0x600 contains 27 entries:
> Tag Type Name/Value
> 0x00000001 (NEEDED) Shared library: [libstdc++.so.6]
> 0x00000001 (NEEDED) Shared library: [libm.so.6]
> 0x00000001 (NEEDED) Shared library: [libgcc_s.so.1]
> 0x00000001 (NEEDED) Shared library: [libc.so.6]
> 0x0000000c (INIT) 0x10380
> 0x0000000d (FINI) 0x105c8
> 0x00000019 (INIT_ARRAY) 0x205f4
> 0x0000001b (INIT_ARRAYSZ) 4 (bytes)
> 0x0000001a (FINI_ARRAY) 0x205f8
> 0x0000001c (FINI_ARRAYSZ) 4 (bytes)
> 0x00000004 (HASH) 0x10168
> 0x00000005 (STRTAB) 0x10230
> 0x00000006 (SYMTAB) 0x101a0
> 0x0000000a (STRSZ) 211 (bytes)
> 0x0000000b (SYMENT) 16 (bytes)
> 0x00000015 (DEBUG) 0x0
> 0x00000003 (PLTGOT) 0x20700
> 0x00000002 (PLTRELSZ) 32 (bytes)
> 0x00000014 (PLTREL) REL
> 0x00000017 (JMPREL) 0x10360
> 0x00000011 (REL) 0x10358
> 0x00000012 (RELSZ) 8 (bytes)
> 0x00000013 (RELENT) 8 (bytes)
> 0x6ffffffe (VERNEED) 0x10318
> 0x6fffffff (VERNEEDNUM) 2
> 0x6ffffff0 (VERSYM) 0x10304
> 0x00000000 (NULL) 0x0
>
> Relocation section '.rel.dyn' at offset 0x358 contains 1 entries:
> Offset Info Type Sym.Value Sym. Name
> 0002071c 00000415 R_ARM_GLOB_DAT 00000000 __gmon_start__
>
> Relocation section '.rel.plt' at offset 0x360 contains 4 entries:
> Offset Info Type Sym.Value Sym. Name
> 0002070c 00000116 R_ARM_JUMP_SLOT 00000000 abort
> 00020710 00000216 R_ARM_JUMP_SLOT 00000000 __libc_start_main
> 00020714 00000416 R_ARM_JUMP_SLOT 00000000 __gmon_start__
> 00020718 00000816 R_ARM_JUMP_SLOT 00000000 printf
>
> Unwind table index '.ARM.exidx' at offset 0x5d8 contains 3 entries:
>
> 0x103d0 <_start>: 0x1 [cantunwind]
>
> 0x104f4 <main>: 0x80840db0
> Compact model index: 0
> 0x84 0x0d pop {r4, r6, r7, r14}
> 0xb0 finish
>
> 0x10564 <__libc_csu_init>: 0x1 [cantunwind]
>
>
> Symbol table '.dynsym' contains 9 entries:
> Num: Value Size Type Bind Vis Ndx Name
> 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
> 1: 00000000 0 FUNC GLOBAL DEFAULT UND abort@GLIBC_2.4 (2)
> 2: 00000000 0 FUNC GLOBAL DEFAULT UND
> __libc_start_main@GLIBC_2.4 (2)
> 3: 00000000 0 FUNC GLOBAL DEFAULT UND
> __aeabi_unwind_cpp_pr0@GCC_3.5 (3)
> 4: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
> 5: 00000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses
> 6: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterTMCloneTab
> 7: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMCloneTable
> 8: 00000000 0 FUNC GLOBAL DEFAULT UND printf@GLIBC_2.4 (2)
>
> Symbol table '.symtab' contains 112 entries:
> Num: Value Size Type Bind Vis Ndx Name
> 0: 00000000 0 NOTYPE LOCAL DEFAULT UND
> 1: 00010134 0 SECTION LOCAL DEFAULT 1
> 2: 00010148 0 SECTION LOCAL DEFAULT 2
> 3: 00010168 0 SECTION LOCAL DEFAULT 3
> 4: 000101a0 0 SECTION LOCAL DEFAULT 4
> 5: 00010230 0 SECTION LOCAL DEFAULT 5
> 6: 00010304 0 SECTION LOCAL DEFAULT 6
> 7: 00010318 0 SECTION LOCAL DEFAULT 7
> 8: 00010358 0 SECTION LOCAL DEFAULT 8
> 9: 00010360 0 SECTION LOCAL DEFAULT 9
> 10: 00010380 0 SECTION LOCAL DEFAULT 10
> 11: 0001038c 0 SECTION LOCAL DEFAULT 11
> 12: 000103d0 0 SECTION LOCAL DEFAULT 12
> 13: 000105c8 0 SECTION LOCAL DEFAULT 13
> 14: 000105d0 0 SECTION LOCAL DEFAULT 14
> 15: 000105d8 0 SECTION LOCAL DEFAULT 15
> 16: 000105f0 0 SECTION LOCAL DEFAULT 16
> 17: 000205f4 0 SECTION LOCAL DEFAULT 17
> 18: 000205f8 0 SECTION LOCAL DEFAULT 18
> 19: 000205fc 0 SECTION LOCAL DEFAULT 19
> 20: 00020600 0 SECTION LOCAL DEFAULT 20
> 21: 00020700 0 SECTION LOCAL DEFAULT 21
> 22: 00020720 0 SECTION LOCAL DEFAULT 22
> 23: 00020728 0 SECTION LOCAL DEFAULT 23
> 24: 00000000 0 SECTION LOCAL DEFAULT 24
> 25: 00000000 0 SECTION LOCAL DEFAULT 25
> 26: 00000000 0 FILE LOCAL DEFAULT ABS /home/macieja/Documents/b
> 27: 00010148 0 NOTYPE LOCAL DEFAULT 2 $d
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>
> Histogram for bucket list length (total of 3 buckets):
> Length Number % of total Coverage
> 0 0 ( 0.0%)
> 1 0 ( 0.0%) 0.0%
> 2 2 ( 66.7%) 50.0%
> 3 0 ( 0.0%) 50.0%
> 4 1 ( 33.3%) 100.0%
>
> Version symbols section '.gnu.version' contains 9 entries:
> Addr: 0000000000010304 Offset: 0x000304 Link: 4 (.dynsym)
> 000: 0 (*local*) 2 (GLIBC_2.4) 2 (GLIBC_2.4) 3 (GCC_3.5)
>
> 004: 0 (*local*) 0 (*local*) 0 (*local*) 0 (*local*)
>
> 008: 2 (GLIBC_2.4)
>
> Version needs section '.gnu.version_r' contains 2 entries:
> Addr: 0x0000000000010318 Offset: 0x000318 Link: 5 (.dynstr)
> 000000: Version: 1 File: libgcc_s.so.1 Cnt: 1
> 0x0010: Name: GCC_3.5 Flags: none Version: 3
> 0x0020: Version: 1 File: libc.so.6 Cnt: 1
> 0x0030: Name: GLIBC_2.4 Flags: none Version: 2
>
> Displaying notes found at file offset 0x00000148 with length 0x00000020:
> Owner Data size Description
> GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
> OS: Linux, ABI: 2.6.32
> Attribute Section: aeabi
> File Attributes
> Tag_CPU_name: "Cortex-A8"
> Tag_CPU_arch: v7
> Tag_CPU_arch_profile: Application
> Tag_ARM_ISA_use: Yes
> Tag_THUMB_ISA_use: Thumb-2
> Tag_ABI_PCS_wchar_t: 4
> Tag_ABI_FP_rounding: Needed
> 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_CPU_unaligned_access: v6
> Tag_Virtualization_use: TrustZone
> -- READELF --
