[fedora-arm] Regenerating the cross stuff
Andy Green
andy at warmcat.com
Tue Aug 3 10:59:52 UTC 2010
On 08/03/10 11:50, Somebody in the thread at some point said:
>> Hum if I go down into the rpmbuild/BUILD where it was made, I can see
>> the original .o and it's fine
>>
>> [agreen at otae libgcc]$ armv5tel-redhat-linux-gnueabi-objdump -f
>> _thumb1_case_sqi.o
>>
>> _thumb1_case_sqi.o: file format elf32-littlearm
>> architecture: arm, flags 0x00000011:
>> HAS_RELOC, HAS_SYMS
>> start address 0x00000000
>>
>> The one that is extracted from the .a file -- surely it is from the
>> above file though -- is broken
>>
>> [agreen at otae tmp]$ armv5tel-redhat-linux-gnueabi-objdump -f
>> _thumb1_case_sqi.o
>>
>> _thumb1_case_sqi.o: file format elf32-little
>> architecture: UNKNOWN!, flags 0x00000010:
>> HAS_SYMS
>> start address 0x00000000
>
> Can you do a bitwise compare between the two files? (Are they even the
> same length?) Bitflip somewhere maybe?
The original is 1560 the extracted is only 686, it just because it's
stripped though
[agreen at otae libgcc]$ armv5tel-redhat-linux-gnueabi-readelf -a
_thumb1_case_sqi.o
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: REL (Relocatable file)
Machine: ARM
Version: 0x1
Entry point address: 0x0
Start of program headers: 0 (bytes into file)
Start of section headers: 624 (bytes into file)
Flags: 0x5000000, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 0 (bytes)
Number of program headers: 0
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 13
Section Headers:
[Nr] Name Type Addr Off Size ES Flg
Lk Inf Al
[ 0] NULL 00000000 000000 000000 00
0 0 0
[ 1] .text PROGBITS 00000000 000034 000014 00 AX
0 0 4
[ 2] .data PROGBITS 00000000 000048 000000 00 WA
0 0 1
[ 3] .bss NOBITS 00000000 000048 000000 00 WA
0 0 1
[ 4] .note.GNU-stack PROGBITS 00000000 000048 000000 00
0 0 1
[ 5] .ARM.attributes ARM_ATTRIBUTES 00000000 000048 000016 00
0 0 1
[ 6] .debug_line PROGBITS 00000000 00005e 000068 00
0 0 1
[ 7] .rel.debug_line REL 00000000 0005e0 000008 08
14 6 4
[ 8] .debug_info PROGBITS 00000000 0000c6 0000e1 00
0 0 1
[ 9] .rel.debug_info REL 00000000 0005e8 000020 08
14 8 4
[10] .debug_abbrev PROGBITS 00000000 0001a7 000014 00
0 0 1
[11] .debug_aranges PROGBITS 00000000 0001c0 000020 00
0 0 8
[12] .rel.debug_arange REL 00000000 000608 000010 08
14 11 4
[13] .shstrtab STRTAB 00000000 0001e0 00008d 00
0 0 1
[14] .symtab SYMTAB 00000000 0004f0 0000d0 10
15 12 4
[15] .strtab STRTAB 00000000 0005c0 00001d 00
0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
There are no section groups in this file.
There are no program headers in this file.
Relocation section '.rel.debug_line' at offset 0x5e0 contains 1 entries:
Offset Info Type Sym.Value Sym. Name
00000053 00000102 R_ARM_ABS32 00000000 .text
Relocation section '.rel.debug_info' at offset 0x5e8 contains 4 entries:
Offset Info Type Sym.Value Sym. Name
00000006 00000802 R_ARM_ABS32 00000000 .debug_abbrev
0000000c 00000902 R_ARM_ABS32 00000000 .debug_line
00000010 00000102 R_ARM_ABS32 00000000 .text
00000014 00000102 R_ARM_ABS32 00000000 .text
Relocation section '.rel.debug_aranges' at offset 0x608 contains 2 entries:
Offset Info Type Sym.Value Sym. Name
00000006 00000602 R_ARM_ABS32 00000000 .debug_info
00000010 00000102 R_ARM_ABS32 00000000 .text
There are no unwind sections in this file.
Symbol table '.symtab' contains 13 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 SECTION LOCAL DEFAULT 1
2: 00000000 0 SECTION LOCAL DEFAULT 2
3: 00000000 0 SECTION LOCAL DEFAULT 3
4: 00000000 0 SECTION LOCAL DEFAULT 4
5: 00000000 0 NOTYPE LOCAL DEFAULT 1 $t
6: 00000000 0 SECTION LOCAL DEFAULT 8
7: 0000000c 0 NOTYPE LOCAL DEFAULT 11 $d
8: 00000000 0 SECTION LOCAL DEFAULT 10
9: 00000000 0 SECTION LOCAL DEFAULT 6
10: 00000000 0 SECTION LOCAL DEFAULT 11
11: 00000000 0 SECTION LOCAL DEFAULT 5
12: 00000001 18 FUNC GLOBAL HIDDEN 1 __gnu_thumb1_case_sqi
No version information found in this file.
Attribute Section: aeabi
File Attributes
Tag_CPU_arch: v4T
Tag_THUMB_ISA_use: Thumb-1
Tag_ABI_align8_preserved: Yes, except leaf SP
(this next guy was pulled from the .a like this -->
[agreen at otae tmp]$ armv5tel-redhat-linux-gnueabi-ar x
/usr/lib/gcc/armv5tel-redhat-linux-gnueabi/4.5.0/libgcc.a )
[agreen at otae tmp]$ armv5tel-redhat-linux-gnueabi-readelf -a
_thumb1_case_sqi.o
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: REL (Relocatable file)
Machine: None
Version: 0x1
Entry point address: 0x0
Start of program headers: 0 (bytes into file)
Start of section headers: 172 (bytes into file)
Flags: 0x5000000
Size of this header: 52 (bytes)
Size of program headers: 0 (bytes)
Number of program headers: 0
Size of section headers: 40 (bytes)
Number of section headers: 9
Section header string table index: 6
Section Headers:
[Nr] Name Type Addr Off Size ES Flg
Lk Inf Al
[ 0] NULL 00000000 000000 000000 00
0 0 0
[ 1] .text PROGBITS 00000000 000034 000014 00 AX
0 0 4
[ 2] .data PROGBITS 00000000 000048 000000 00 WA
0 0 1
[ 3] .bss NOBITS 00000000 000048 000000 00 WA
0 0 1
[ 4] .note.GNU-stack PROGBITS 00000000 000048 000000 00
0 0 1
[ 5] .ARM.attributes LOPROC+3 00000000 000048 000016 00
0 0 1
[ 6] .shstrtab STRTAB 00000000 00005e 00004c 00
0 0 1
[ 7] .symtab SYMTAB 00000000 000214 000080 10
8 7 4
[ 8] .strtab STRTAB 00000000 000294 00001a 00
0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
There are no section groups in this file.
There are no program headers in this file.
There are no relocations in this file.
There are no unwind sections in this file.
Symbol table '.symtab' contains 8 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 NOTYPE LOCAL DEFAULT 1 $t
2: 00000000 0 SECTION LOCAL DEFAULT 1
3: 00000000 0 SECTION LOCAL DEFAULT 2
4: 00000000 0 SECTION LOCAL DEFAULT 3
5: 00000000 0 SECTION LOCAL DEFAULT 4
6: 00000000 0 SECTION LOCAL DEFAULT 5
7: 00000001 18 FUNC GLOBAL HIDDEN 1 __gnu_thumb1_case_sqi
No version information found in this file.
It's a bit like something wrote an int to the wrong place in the header
somewhere along the line.
-Andy
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