Confused by MIPS.options in ELF64

[Alex Gonzalez]

Hi,

I am porting a 32bits MIPS application to 64 bits. Using readelf to
compare the results, the 64bits version has a MIPS.options section
which seems misplaced.

I am using ld to link statically with -Ttext and the default linker
script. I am just an ld user with no deeper experience, but it seems
to me that the default script doesn't handle the MIPS.options section
appropriately.

The ELF64 ABI states that the options section has to follow the
program header table, and it indeed does.

But then, if I try to use objcopy to produce a raw binary file, it
produces a huge file. I need a raw binary file to launch the program.

Could anyone shed some light on this issue? Any pointer is very much
appreciated.

Thanks,
Alex

PS: The readelf of both files as reference,

pub/bin/p1/pv1000_p1.elf:     file format elf64-tradbigmips

Sections:
Idx Name          Size      VMA               LMA               File off  Algn
  0 .text         00090fa0  0000000081000000  0000000081000000  00001c60  2**5
                  CONTENTS, ALLOC, LOAD, CODE
  1 .MIPS.options 00001ba8  00000000100000b0  00000000100000b0  000000b0  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .rodata       00017c70  0000000081090fa0  0000000081090fa0  00092c00  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  3 .data         00007a60  00000000810a8c10  00000000810a8c10  000aa870  2**4
                  CONTENTS, ALLOC, LOAD, DATA
  4 .got          00007e08  00000000810b0670  00000000810b0670  000b22d0  2**4
                  CONTENTS, ALLOC, LOAD, DATA
  5 .sbss         00000000  00000000810b8478  00000000810b8478  000ba0e0  2**0
                  ALLOC
  6 .bss          007985c0  00000000810b8480  00000000810b8480  000ba0e0  2**5
                  ALLOC
  7 .comment      000017a7  0000000000000000  0000000000000000  000ba0e0  2**0
                  CONTENTS, READONLY
  8 .debug_aranges 00002ac0  0000000000000000  0000000000000000  000bb890  2**4
                  CONTENTS, READONLY, DEBUGGING
  9 .debug_pubnames 00007736  0000000000000000  0000000000000000  000be350  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_info   001fe1ea  0000000000000000  0000000000000000  000c5a86  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_abbrev 00019de6  0000000000000000  0000000000000000  002c3c70  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_line   0003e917  0000000000000000  0000000000000000  002dda56  2**0
                  CONTENTS, READONLY, DEBUGGING
 13 .debug_frame  00015e90  0000000000000000  0000000000000000  0031c370  2**3
                  CONTENTS, READONLY, DEBUGGING
 14 .debug_str    00010469  0000000000000000  0000000000000000  00332200  2**0
                  CONTENTS, READONLY, DEBUGGING
 15 .debug_macinfo 0028e064  0000000000000000  0000000000000000  00342669  2**0
                  CONTENTS, READONLY, DEBUGGING
 16 .pdr          0000aa80  0000000000000000  0000000000000000  005d06d0  2**2
                  CONTENTS, READONLY
 17 .mdebug.abi64 00000000  0000000000000000  0000000000000000  005db150  2**0
                  CONTENTS, READONLY
 18 .debug_ranges 00000680  0000000000000000  0000000000000000  005db150  2**0
                  CONTENTS, READONLY, DEBUGGING

pub/bin/p1/pv1000_p1.elf:     file format elf32-ntradbigmips

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         0008fd00  81000000  81000000  000000a0  2**5
                  CONTENTS, ALLOC, LOAD, CODE
  1 .rodata       000183a0  8108fd00  8108fd00  0008fda0  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .reginfo      00000018  810a80a0  810a80a0  000a8140  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA, LINK_ONCE_SAME_SIZE
  3 .data         00004fb0  810a80c0  810a80c0  000a8160  2**4
                  CONTENTS, ALLOC, LOAD, DATA
  4 .got          00003f94  810ad070  810ad070  000ad110  2**4
                  CONTENTS, ALLOC, LOAD, DATA
  5 .sbss         00000000  810b1004  810b1004  000b10c0  2**0
                  ALLOC
  6 .bss          0053f674  810b1020  810b1020  000b10c0  2**5
                  ALLOC
  7 .comment      000017a7  00000000  00000000  000b10c0  2**0
                  CONTENTS, READONLY
  8 .debug_aranges 00001580  00000000  00000000  000b2868  2**3
                  CONTENTS, READONLY, DEBUGGING
  9 .debug_pubnames 00005bba  00000000  00000000  000b3de8  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_info   00148693  00000000  00000000  000b99a2  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_abbrev 00016b40  00000000  00000000  00202035  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_line   0003d537  00000000  00000000  00218b75  2**0
                  CONTENTS, READONLY, DEBUGGING
 13 .debug_frame  0000c3f4  00000000  00000000  002560ac  2**2
                  CONTENTS, READONLY, DEBUGGING
 14 .debug_str    00011dc5  00000000  00000000  002624a0  2**0
                  CONTENTS, READONLY, DEBUGGING
 15 .debug_macinfo 0028dc80  00000000  00000000  00274265  2**0
                  CONTENTS, READONLY, DEBUGGING
 16 .pdr          0000ab20  00000000  00000000  00501ee8  2**2
                  CONTENTS, READONLY
 17 .mdebug.abiN32 00000000  00000000  00000000  0050ca08  2**0
                  CONTENTS, READONLY
 18 .debug_ranges 00000310  00000000  00000000  0050ca08  2**0
                  CONTENTS, READONLY, DEBUGGING