[RFA] mips-n32 use_struct_convention

[Michael Snyder <msnyder@redhat.com>]

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This patch makes use_struct_convention work correctly for N32, 
and incidentally adds a couple of convenience macros (yes, they
are gdbarch-compatible).

This is one half of my earlier patch for N32, which I'll withdraw
if this and the following are acceptable.  Just splitting it up
for ease of review.

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2002-08-01  Michael Snyder  <msnyder@redhat.com>

	*  mips-tdep.c: Define new macros MIPS_NEWABI, MIPS_OLDABI
	(by analogy with MIPS_EABI).
	(mips_use_struct_convention):  NEWABI (n32 and n64) uses
	same scheme as EABI.

Index: mips-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/mips-tdep.c,v
retrieving revision 1.87
diff -c -3 -p -r1.87 mips-tdep.c
*** mips-tdep.c	1 Aug 2002 21:36:27 -0000	1.87
--- mips-tdep.c	2 Aug 2002 02:19:11 -0000
*************** struct gdbarch_tdep
*** 146,153 ****
      enum gdb_osabi osabi;
    };
  
! #define MIPS_EABI (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI32 \
! 		   || gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI64)
  
  #define MIPS_LAST_FP_ARG_REGNUM (gdbarch_tdep (current_gdbarch)->mips_last_fp_arg_regnum)
  
--- 146,162 ----
      enum gdb_osabi osabi;
    };
  
! #define MIPS_EABI \
!      (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI32 \
!       || gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI64)
! 
! #define MIPS_NEWABI \
!      (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_N32 \
!       || gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_N64)
! 
! #define MIPS_OLDABI \
!      (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_O32 \
!       || gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_O64)
  
  #define MIPS_LAST_FP_ARG_REGNUM (gdbarch_tdep (current_gdbarch)->mips_last_fp_arg_regnum)
  
*************** show_mask_address (char *cmd, int from_t
*** 561,570 ****
  int
  mips_use_struct_convention (int gcc_p, struct type *type)
  {
!   if (MIPS_EABI)
      return (TYPE_LENGTH (type) > 2 * MIPS_SAVED_REGSIZE);
    else
!     return 1;			/* Structures are returned by ref in extra arg0 */
  }
  
  /* Tell if the program counter value in MEMADDR is in a MIPS16 function.  */
--- 570,579 ----
  int
  mips_use_struct_convention (int gcc_p, struct type *type)
  {
!   if (MIPS_EABI || MIPS_NEWABI)
      return (TYPE_LENGTH (type) > 2 * MIPS_SAVED_REGSIZE);
    else
!     return 1;	/* Old ABI: structures are returned by ref in extra arg0 */
  }
  
  /* Tell if the program counter value in MEMADDR is in a MIPS16 function.  */