gcc/config/m88k/sysv3.h

/* Definitions of target machine for GNU compiler.
   Motorola m88100 running the AT&T/Unisoft/Motorola V.3 reference port.
   Copyright (C) 1990, 1991, 1997, 1998, 1999 Free Software Foundation, Inc.
   Contributed by Ray Essick (ressick@mot.com)
   Enhanced by Tom Wood (Tom_Wood@NeXT.com)

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "m88k/m88k.h"

/* Default switches */
#undef	TARGET_DEFAULT
#define TARGET_DEFAULT	(MASK_CHECK_ZERO_DIV	| \
			 MASK_OCS_DEBUG_INFO	| \
			 MASK_OCS_FRAME_POSITION)

/* Macros to be automatically defined.  */
#undef	CPP_PREDEFINES
#define CPP_PREDEFINES "-Dm88000 -Dm88k -Dunix -DsysV88 -D__CLASSIFY_TYPE__=2 -Asystem=unix -Asystem=svr3 -Acpu=m88k -Amachine=m88k"

/* Override svr3.h to link with ?crt0.o instead of ?crt1.o and ?crtn.o.
   From arul@sdsu.edu.  */
#undef	STARTFILE_SPEC
#define STARTFILE_SPEC \
   "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}} crtbegin.o%s"

/* Profiled libraries live in a different directory but keep the same
   names other than that.  arul@sdsu.edu says -lg is always needed.  */
#undef	LIB_SPEC
#define LIB_SPEC "%{p:-L/lib/libp}%{pg:%{!p:-L/lib/libp}} -lg -lc crtend.o%s"

/* We need POSIX/XOPEN symbols; otherwise building libio will fail.  */
#define ADD_MISSING_POSIX 1
#define ADD_MISSING_XOPEN 1

/* Hot version of the profiler that uses r10 to pass the address of
   the counter.  the _gcc_mcount routine knows not to screw with
   the parameter registers.

   DG/UX does this; i wrote a gnu-c/88k specific version and put it
   in libgcc2.c -- RBE; this macro knows about the leading underscore
   convention.  */
#undef	FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO) \
  output_function_profiler (FILE, LABELNO, "_gcc_mcount", 0)

/* Various other changes that we want to have in place without
   too many changes to the m88k.h file.  */
#undef	USE_LIBG
#define	USE_LIBG

/* Define a few machine-specific details of the implementation of
   constructors.  */

/* Although the .init section is used, it is not automatically invoked.  */
#define INVOKE__main

#define CTOR_LIST_BEGIN	    		\
  asm (INIT_SECTION_ASM_OP);		\
  asm ("\tsubu\t r31,r31,16");	/* (STACK_BOUNDARY / BITS_PER_UNIT) == 16 */ \
  asm ("\tst\t r0,r31,32");	/* REG_PARM_STACK_SPACE (0) == 32 */
#define CTOR_LIST_END

/* ASM_OUTPUT_CONSTRUCTOR outputs code into the .init section to push the
   address of the constructor.  This becomes the body of __do_global_ctors
   in crtstuff.c.  r13 is a temporary register.  */
#undef	ASM_OUTPUT_CONSTRUCTOR
#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)				\
  do {									\
    init_section ();							\
    fprintf (FILE, "\tor.u\t r13,r0,hi16(");				\
    assemble_name (FILE, NAME);						\
    fprintf (FILE, ")\n\tor\t r13,r13,lo16(");				\
    assemble_name (FILE, NAME);						\
    fprintf (FILE, ")\n\tsubu\t r31,r31,%d\n\tst\t r13,r31,%d\n",	\
	     STACK_BOUNDARY / BITS_PER_UNIT, REG_PARM_STACK_SPACE (0));	\
  } while (0)

#undef	DO_GLOBAL_CTORS_BODY
#define DO_GLOBAL_CTORS_BODY						\
do {									\
  func_ptr *__CTOR_LIST__ = __builtin_alloca (1), *p;			\
  for (p = __CTOR_LIST__ + 4; *p; p += 4)				\
    (*p) ();								\
} while (0)

#define DTOR_LIST_BEGIN							\
  asm (FINI_SECTION_ASM_OP);						\
  func_ptr __DTOR_LIST__[4] = { (func_ptr) (-1), (func_ptr) (-1),	\
				(func_ptr) (-1), (func_ptr) (-1) }
#define DTOR_LIST_END						  	\
  asm (FINI_SECTION_ASM_OP);						\
  func_ptr __DTOR_END__[4] = { (func_ptr) 0, (func_ptr) 0,		\
			       (func_ptr) 0, (func_ptr) 0 }  

/* A C statement (sans semicolon) to output an element in the table of
   global destructors.  The table is constructed in the .fini section
   so that an explicit linker script is not required.  The complication
   is that this section is padded with NOP instructions and to either
   8 or 16 byte alignment depending on the specific system.  A clever
   way to avoid trouble is to output a block of 16 bytes where the
   extra words are known values (-1).  */
#undef	ASM_OUTPUT_DESTRUCTOR
#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)	\
  do {						\
    register int i;				\
    fini_section ();				\
    fprintf (FILE, "\t%s\t ", ASM_LONG);	\
    assemble_name (FILE,NAME);			\
    fprintf (FILE, "\n");			\
    for (i = 1; i < 4; i++)			\
      fprintf (FILE, "\t%s\t -1\n", ASM_LONG);	\
    } while (0)

/* Walk the list looking for the terminating zero and ignoring all values of
   -1.  */
#undef	DO_GLOBAL_DTORS_BODY
#define DO_GLOBAL_DTORS_BODY			\
  do {						\
    int i;					\
    for (i = 0; __DTOR_LIST__[i] != 0; i++)	\
      if (((int *)__DTOR_LIST__)[i] != -1)	\
	__DTOR_LIST__[i] ();			\
  } while (0)					

#undef INITIALIZE_TRAMPOLINE 
#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			\
{									\
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 40)), FNADDR); \
  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 36)), CXT); \
  emit_call_insn (gen_call						\
		  (gen_rtx_MEM						\
		   (SImode,						\
		    gen_rtx_SYMBOL_REF (Pmode, "__enable_execute_stack")), \
		   const0_rtx));					\
}