objdump or gdb to force a section to load ?
Brendan Simon
brendan@dgs.monash.edu.au
Thu Jul 1 00:00:00 GMT 1999
I sent this a while ago and got no response. I'm resending it just in case
it got lost.
Sorry if you have already received this before.
Brendan Simon.
Brendan Simon wrote:
> I have a linux kernel compiled for a mpc860 target and am trying to get
> it to run by downloading it into memory using a background debugger
> (BDM). The boot code gets to the point where it trys to uncompress the
> kernel but fails because the image isn't loaded into memory (only .text,
> .rodata and .data are loaded). I tried using objcopy to set the "image"
> section to "load" but it does not seem to work. How can I get gdb to
> load the image section (either using a gdb command or binutils) ?
>
> Here is a before/after trace using objcopy --set-section-flags. As you
> can see, the load attribute is not set. I've tried all combinations of
> attributes but I can't get it to work. Am I doing something wrong ?
>
> powerpc-linux-objdump --section-headers myzimage
> myzimage: file format elf32-powerpc
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .text 00004324 00100000 00100000 00010000 2**2
> CONTENTS, ALLOC, LOAD, READONLY, CODE
> 1 .rodata 00000460 00104330 00104330 00014330 2**4
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 2 .data 000002f8 00105000 00105000 00015000 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 3 .bss 0000bbac 00106000 00106000 00016000 2**2
> ALLOC
> 4 image 0006ccbf 00000000 00000000 00016000 2**0
> CONTENTS, READONLY
>
> powerpc-linux-objcopy --set-section-flags=image=load myzimage
>
> powerpc-linux-objdump --section-headers myzimage
> myzimage: file format elf32-powerpc
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .text 00004324 00100000 00100000 00010000 2**2
> CONTENTS, ALLOC, LOAD, READONLY, CODE
> 1 .rodata 00000460 00104330 00104330 00014330 2**4
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 2 .data 000002f8 00105000 00105000 00015000 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 3 .bss 0000bbac 00106000 00106000 00016000 2**2
> ALLOC
> 4 image 0006ccbf 00000000 00000000 00016000 2**0
> CONTENTS
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