import gdb-1999-12-06 snapshot

[thirdparty/binutils-gdb.git] / gdb / config / i386 / tm-i386v.h

/* Macro definitions for i386, Unix System V.
   Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.

   This file is part of GDB.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef TM_I386V_H
#define TM_I386V_H 1

/* First pick up the generic *86 target file. */

#include "i386/tm-i386.h"

/* Number of traps that happen between exec'ing the shell to run an
   inferior, and when we finally get to the inferior code.  This is
   2 on most implementations.  Override here to 4. */

#undef  START_INFERIOR_TRAPS_EXPECTED
#define START_INFERIOR_TRAPS_EXPECTED 4

#undef  STORE_STRUCT_RETURN
#define STORE_STRUCT_RETURN(ADDR, SP) \
  { char buf[REGISTER_SIZE];	\
    (SP) -= sizeof (ADDR);	\
    store_address (buf, sizeof (ADDR), ADDR);	\
    write_memory ((SP), buf, sizeof (ADDR)); }

/* Extract from an array REGBUF containing the (raw) register state
   a function return value of type TYPE, and copy that, in virtual format,
   into VALBUF.  */

#undef  EXTRACT_RETURN_VALUE
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  memcpy ((VALBUF), (REGBUF), TYPE_LENGTH (TYPE))

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#undef  STORE_RETURN_VALUE
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
\f

/* Describe the pointer in each stack frame to the previous stack frame
   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address
   and produces the frame's chain-pointer. */

#undef  FRAME_CHAIN
#define FRAME_CHAIN(thisframe) \
  (!inside_entry_file ((thisframe)->pc) ? \
   read_memory_integer ((thisframe)->frame, 4) :\
   0)

/* Define other aspects of the stack frame.  */

/* A macro that tells us whether the function invocation represented
   by FI does not have a frame on the stack associated with it.  If it
   does not, FRAMELESS is set to 1, else 0.  */

#undef  FRAMELESS_FUNCTION_INVOCATION
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
  (frameless_look_for_prologue (FI))

#undef  FRAME_SAVED_PC
#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))

/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell.  */

#undef  FRAME_NUM_ARGS
#define FRAME_NUM_ARGS(fi) (-1)

/* Forward decl's for prototypes */
struct frame_info;
struct frame_saved_regs;

extern int
i386_frame_num_args PARAMS ((struct frame_info *));

#endif /* ifndef TM_I386V_H */