[RFA] mips, floating point arg passing

[Michael Snyder <msnyder@redhat.com>]

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GDB is causing SIGFPE on target boards that have a FPU,
when compiled for a 32 bit ABI.


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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;