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

[Elena Zannoni <ezannoni@redhat.com>]

Corinna Vinschen writes:
 > 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
 > 
 > 	* 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);
 > +		}

I'd prefer if there is an 'else if' clause just for the
doubles. I.e. don't use len in the test, but TYPE_LENGTH(type). This is
too confusing.

 >  	      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);
 > 

this one is fine.

elena


 > -- 
 > Corinna Vinschen
 > Cygwin Developer
 > Red Hat, Inc.