building openbios-qemu.elf?

[Hollis Blanchard]

Hi, I just tried to build openbios-qemu.elf, but it is a little too big
(1MB + 4 bytes):

Elf file type is EXEC (Executable file)
Entry point 0xfff08000
There are 3 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000094 0xfff00000 0xfff00000 0x100000 0x100000 RWE 0x4
  LOAD           0x100094 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
  GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4

Section to Segment mapping:
  Segment Sections...
   00     .text.vectors .text .rodata .data .sdata .bss .sbss 
   01     .romentry 
   02

In contrast, the openbios-ppc binary in qemu looks like this:

Elf file type is EXEC (Executable file)
Entry point 0xfff08000
There are 2 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000074 0xfff00000 0xfff00000 0x41044 0x4bc44 RWE 0x4
  LOAD           0x0410b8 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1

Section to Segment mapping:
  Segment Sections...
   00     .text.vectors .text .rodata .data .sdata .bss .sbss.1 .sbss.2 .sbss.3 .sbss.4 .sbss.5 .sbss.6 .sbss.7 .sbss.8 
   01     .romentry

I'm building with gcc 4.2.3. Any ideas?

[Laurent Vivier]

Hi,

Do you use source from SVN head ?
Do you have any information in obj-ppc/build.log ?

I use gcc-4.3.2 on my powerPC G4, powerpc-linux-gnu-gcc-4.2.4 on intel  
T5500 and size is fine.

Regards,
Laurent

Le 23 févr. 09 à 20:52, Hollis Blanchard a écrit :
> Hi, I just tried to build openbios-qemu.elf, but it is a little too  
> big
> (1MB + 4 bytes):
>
> Elf file type is EXEC (Executable file)
> Entry point 0xfff08000
> There are 3 program headers, starting at offset 52
>
> Program Headers:
>  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg  
> Align
>  LOAD           0x000094 0xfff00000 0xfff00000 0x100000 0x100000 RWE  
> 0x4
>  LOAD           0x100094 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
>  GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
>
> Section to Segment mapping:
>  Segment Sections...
>   00     .text.vectors .text .rodata .data .sdata .bss .sbss
>   01     .romentry
>   02
>
> In contrast, the openbios-ppc binary in qemu looks like this:
>
> Elf file type is EXEC (Executable file)
> Entry point 0xfff08000
> There are 2 program headers, starting at offset 52
>
> Program Headers:
>  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg  
> Align
>  LOAD           0x000074 0xfff00000 0xfff00000 0x41044 0x4bc44 RWE 0x4
>  LOAD           0x0410b8 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
>
> Section to Segment mapping:
>  Segment Sections...
>   00     .text.vectors .text .rodata .data .sdata .bss .sbss.1 .sbss. 
> 2 .sbss.3 .sbss.4 .sbss.5 .sbss.6 .sbss.7 .sbss.8
>   01     .romentry
>
> I'm building with gcc 4.2.3. Any ideas?

[Qemu-devel] Re: building openbios-qemu.elf?

[Hollis Blanchard]

On Tue, 2009-02-24 at 00:07 +0100, Laurent Vivier wrote:
> Hi,
>
> Do you use source from SVN head ?

Yes.
> Do you have any information in obj-ppc/build.log ?

This is somewhat interesting:

powerpc-440-linux-gnu-strip openbios-qemu.elf
BFD: st4PszLi: warning: allocated section `.bss' not in segment
BFD: st4PszLi: warning: allocated section `.sbss' not in segment

The "nostrip" version of openbios-qemu.elf looks much better:

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000094 0xfff00000 0xfff00000 0x42044 0x4bcb4 RWE 0x4
  LOAD           0x0420d8 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
  GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4

Section to Segment mapping:
  Segment Sections...
   00     .text.vectors .text .rodata .data .sdata 
   01     .romentry 
   02

So something goes wrong in the strip process.

[Qemu-devel] building openbios-qemu.elf?

[Blue Swirl]

On 2/23/09, Hollis Blanchard  wrote:
> Hi, I just tried to build openbios-qemu.elf, but it is a little too big
>  (1MB + 4 bytes):
>
> Elf file type is EXEC (Executable file)
>  Entry point 0xfff08000
>  There are 3 program headers, starting at offset 52
>
> Program Headers:
>   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
>   LOAD           0x000094 0xfff00000 0xfff00000 0x100000 0x100000 RWE 0x4
>   LOAD           0x100094 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
>   GNU_STACK      0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
>
> Section to Segment mapping:
>   Segment Sections...
>    00     .text.vectors .text .rodata .data .sdata .bss .sbss
>    01     .romentry
>    02
>
> In contrast, the openbios-ppc binary in qemu looks like this:
>
> Elf file type is EXEC (Executable file)
>  Entry point 0xfff08000
>  There are 2 program headers, starting at offset 52
>
> Program Headers:
>   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
>   LOAD           0x000074 0xfff00000 0xfff00000 0x41044 0x4bc44 RWE 0x4
>   LOAD           0x0410b8 0xfffffffc 0xfffffffc 0x00004 0x00004 R E 0x1
>
> Section to Segment mapping:
>   Segment Sections...
>    00     .text.vectors .text .rodata .data .sdata .bss .sbss.1 .sbss.2 .sbss.3 .sbss.4 .sbss.5 .sbss.6 .sbss.7 .sbss.8
>    01     .romentry
>
> I'm building with gcc 4.2.3. Any ideas?

The ldscript does not handle sdata and sbss.*?