[RFA] mips, floating point arg passing

[Michael Snyder]

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Michael Snyder wrote:
> GDB is causing SIGFPE on target boards that have a FPU,
> when compiled for a 32 bit ABI.
> 
> 
> ------------------------------------------------------------------------
> 
> 2006-05-31  Michael Snyder  <msnyder@redhat.com>
> 
> 	* mips-tdep.c (mips_eabi_push_dummy_call): For 32 bit ABI, to
> 	decide how many registers it takes to pass a floating point
> 	argument, what matters is the size of a floating point register
> 	(not the size of a general purpose register).
> 	(mips_o32_push_dummy_call): Ditto.
> 
> Index: mips-tdep.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/mips-tdep.c,v
> retrieving revision 1.393
> diff -p -r1.393 mips-tdep.c
> *** mips-tdep.c	31 May 2006 23:15:50 -0000	1.393
> --- mips-tdep.c	31 May 2006 23:28:59 -0000
> *************** mips_eabi_push_dummy_call (struct gdbarc
> *** 2494,2500 ****
>         if (fp_register_arg_p (typecode, arg_type)
>   	  && float_argreg <= MIPS_LAST_FP_ARG_REGNUM)
>   	{
> ! 	  if (mips_abi_regsize (gdbarch) < 8 && len == 8)
>   	    {
>   	      int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0;
>   	      unsigned long regval;
> --- 2494,2500 ----
>         if (fp_register_arg_p (typecode, arg_type)
>   	  && float_argreg <= MIPS_LAST_FP_ARG_REGNUM)
>   	{
> ! 	  if (register_size (gdbarch, float_argreg) < 8 && len == 8)
>   	    {
>   	      int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0;
>   	      unsigned long regval;
> *************** mips_o32_push_dummy_call (struct gdbarch
> *** 3118,3124 ****
>         if (fp_register_arg_p (typecode, arg_type)
>   	  && float_argreg <= MIPS_LAST_FP_ARG_REGNUM)
>   	{
> ! 	  if (mips_abi_regsize (gdbarch) < 8 && len == 8)
>   	    {
>   	      int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0;
>   	      unsigned long regval;
> --- 3118,3124 ----
>         if (fp_register_arg_p (typecode, arg_type)
>   	  && float_argreg <= MIPS_LAST_FP_ARG_REGNUM)
>   	{
> ! 	  if (register_size (gdbarch, float_argreg) < 8 && len == 8)
>   	    {
>   	      int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0;
>   	      unsigned long regval;