Re: [RFA] sh-tdep.c: Fix little endian problem with doubles

[Michael Snyder <msnyder@redhat.com>]

Corinna Vinschen wrote:
> Hi,
> 
> I missed to get little endian mode right when it comes to passing
> doubles in registers on FPU CPUs.  The below patch fixes that.
> It's against the two patches I sent on Saturday.
> 
> Corinna

Giving an independent non-maintainer nod to this code...
I encountered the same issue earlier, and I think what
you're doing is right.  In fact, I thought I had done it.
Memory fails me...

Michael

> 
> 	* sh-tdep.c (sh_push_dummy_call_fpu): Accomodate double passing
> 	in little endian mode.
> 	(sh3e_sh4_extract_return_value): Ditto.
> 
> --- sh-tdep.c.INTERIM	2003-10-04 13:22:01.000000000 +0200
> +++ sh-tdep.c	2003-10-07 18:42:13.000000000 +0200
> @@ -846,6 +846,17 @@ sh_push_dummy_call_fpu (struct gdbarch *
>  	      /* Argument goes in a float argument register.  */
>  	      reg_size = register_size (gdbarch, flt_argreg);
>  	      regval = extract_unsigned_integer (val, reg_size);
> +	      /* A float type taking two registers must be handled
> +	         differently in LE mode.  */
> +	      if (TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE
> +	          && len == 2 * reg_size)
> +	        {
> +		  regcache_cooked_write_unsigned (regcache, flt_argreg + 1,
> +						  regval);
> +		  val += reg_size;
> +		  len -= reg_size;
> +		  regval = extract_unsigned_integer (val, reg_size);
> +		}
>  	      regcache_cooked_write_unsigned (regcache, flt_argreg++, regval);
>  	    }
>  	  else if (!treat_as_flt && argreg <= ARGLAST_REGNUM)
> @@ -978,7 +989,10 @@ sh3e_sh4_extract_return_value (struct ty
>        int len = TYPE_LENGTH (type);
>        int i, regnum = FP0_REGNUM;
>        for (i = 0; i < len; i += 4)
> -	regcache_raw_read (regcache, regnum++, (char *) valbuf + i);
> +	if (TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)
> +	  regcache_raw_read (regcache, regnum++, (char *) valbuf + len - 4 - i);
> +	else
> +	  regcache_raw_read (regcache, regnum++, (char *) valbuf + i);
>      }
>    else
>      sh_default_extract_return_value (type, regcache, valbuf);
>