[COMMITTED] libsframe: revisit sframe_find_fre API

[Jan Beulich]

On 26.05.2023 09:01, Indu Bhagat via Binutils wrote:
> @@ -1022,40 +1049,28 @@ sframe_find_fre (sframe_decoder_ctx *ctx, int32_t pc,
>      bitmask = 0xff;
>  
>    fres = ctx->sfd_fres + fdep->sfde_func_start_fre_off;
> +  func_start_addr = fdep->sfde_func_start_address;
> +
>    for (i = 0; i < fdep->sfde_func_num_fres; i++)
>     {
> -     err = sframe_decode_fre (fres, &next_fre, fre_type, &esz);
> -     start_address = next_fre.fre_start_addr;
> +     err = sframe_decode_fre (fres, &cur_fre, fre_type, &size);
> +     if (err)
> +       return sframe_set_errno (&err, SFRAME_ERR_FRE_INVAL);
>  
> -     if (((fdep->sfde_func_start_address
> -	   + (int32_t) start_address) & bitmask) <= (pc & bitmask))
> +     start_ip = func_start_addr + cur_fre.fre_start_addr;
> +     end_ip_offset = sframe_fre_get_end_ip_offset (fdep, i, fres + size);
> +     end_ip = func_start_addr + end_ip_offset;
> +
> +     if ((start_ip & bitmask) > (pc & bitmask))
> +       return sframe_set_errno (&err, SFRAME_ERR_FRE_INVAL);
> +
> +     if (((start_ip & bitmask) <= (pc & bitmask))
> +	 && (end_ip & bitmask) >= (pc & bitmask))
>         {
> -	 sframe_frame_row_entry_copy (&cur_fre, &next_fre);
> -
> -	 /* Get the next FRE in sequence.  */
> -	 if (i < fdep->sfde_func_num_fres - 1)
> -	   {
> -	     sp += esz;

The buildbot failure just reported was found on the commit prior to this
one, which removed the declaration of sp. Please try to make sure that
every patch builds (and works) okay individually.

Jan