Re: Objcopy problem

["H.J. Lu" <hjl at lucon dot org>]

On Mon, Oct 29, 2007 at 07:41:11PM +0000, Andrew STUBBS wrote:
> Hi,
> 
> I'm having a bit of trouble adjusting section flags with objcopy.
> 
> I can create a test case using the following program and linker script:
> 
> FILE: test.c
> int main()
> {
> }
> END-FILE
> 
> FILE: link.ld
> SECTIONS
> {
>   .text           :
>   {
>     *(.text .stub .text.* .gnu.linkonce.t.*)
>   } =0
>   .post_text_reserve :
>   {
>     /* Reserve some space so we can drop something in here later */
>     . += 0x160;
>   }
> }
> END-FILE
> 
>   $ gcc test.c -T link.ld -nostdlib
> 
> This successfully produces a (rather useless) binary which looks like this:
> 
>   $ sh4objdump -ph a.out
> 
> a.out:     file format elf32-shl
> 
> Program Header:
>     LOAD off    0x00000080 vaddr 0x00000000 paddr 0x00000000 align 2**7
>          filesz 0x0000000c memsz 0x0000016c flags rwx
> 
> Sections:
> Idx Name          Size      VMA       LMA       File off  Algn
>   0 .text         0000000c  00000000  00000000  00000080  2**1
>                   CONTENTS, ALLOC, LOAD, READONLY, CODE
>   1 .post_text_reserve 00000160  0000000c  0000000c  0000008c  2**0
>                   ALLOC
>   2 .comment      00000043  00000000  00000000  0000008c  2**0
>                   CONTENTS, READONLY
> 

.post_text_reserve has file size 0 and memory size 0x160

> 
> 
> 
> All good so far, but now I need to add extra flags to the 
> .post_text_reserve section.
> 
> I used to be able to do it with objdump (I was using 2.16.91.0.5), but 
> now I get an error (using 2.17.50.0.17):
>     $ sh4objcopy a.out a2.out --set-section-flags 
> .post_text_reserve=contents,alloc,load,readonly,code

How do you load a section with file size 0?


H.J.