Re: [Qemu-devel] [PATCH 11/12] linux-user: Extract load_elf_image from load_elf_interp.

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Tue, Jul 27, 2010 at 10:25:37AM -0700, Richard Henderson wrote:
> Moving toward a single copy of the elf binary loading code.
> Fill in the details of the loaded image into a struct image_info.
> 
> Adjust create_elf_tables to read from such structures instead
> of from a collection of passed arguments.  Don't return error
> values from load_elf_interp; always exit(-1) with a message to
> stderr.  Collect elf_interpreter handling in load_elf_binary
> to a common spot.
> 
> Signed-off-by: Richard Henderson <rth@twiddle.net>
> ---
>  linux-user/elfload.c |  341 ++++++++++++++++++++++++-------------------------
>  1 files changed, 167 insertions(+), 174 deletions(-)
> 
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 61167cd..8ff9b6a 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -1079,11 +1079,9 @@ static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
>  }
>  
>  static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
> -                                   struct elfhdr * exec,
> -                                   abi_ulong load_addr,
> -                                   abi_ulong load_bias,
> -                                   abi_ulong interp_load_addr,
> -                                   struct image_info *info)
> +                                   struct elfhdr *exec,
> +                                   struct image_info *info,
> +                                   struct image_info *interp_info)
>  {
>      abi_ulong sp;
>      int size;
> @@ -1128,13 +1126,13 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
>      NEW_AUX_ENT (AT_NULL, 0);
>  
>      /* There must be exactly DLINFO_ITEMS entries here.  */
> -    NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
> +    NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
>      NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
>      NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
>      NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
> -    NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
> +    NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info->load_addr));


Hi Richard,

I think this part breaks loading of statically linked ELFs (no
interpreter). I beleive Linux sets AT_BASE to zero in those cases.

Cheers