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/* Native support for the SGI Iris running IRIX version 4, for GDB.

   Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1995

   Free Software Foundation, Inc.

   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU

   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.

   Implemented for Irix 4.x by Garrett A. Wollman.

   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.  */

#include "defs.h"

#include "inferior.h"

#include "gdbcore.h"

#include <sys/time.h>

#include <sys/procfs.h>

#include <setjmp.h>             /* For JB_XXX.  */

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

typedef unsigned int greg_t;    /* why isn't this defined? */

static void

fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));

/*

 * See the comment in m68k-tdep.c regarding the utility of these functions.

 */

void

supply_gregset (gregsetp)

     gregset_t *gregsetp;

{

  register int regi;

  register greg_t *regp = (greg_t *) (gregsetp->gp_regs);

  static char zerobuf[MAX_REGISTER_RAW_SIZE] =

  {0};

  /* FIXME: somewhere, there should be a #define for the meaning

     of this magic number 32; we should use that. */

  for (regi = 0; regi < 32; regi++)

    supply_register (regi, (char *) (regp + regi));

  supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));

  supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));

  supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));

  supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));

  /* Fill inaccessible registers with zero.  */

  supply_register (BADVADDR_REGNUM, zerobuf);

}

void

fill_gregset (gregsetp, regno)

     gregset_t *gregsetp;

     int regno;

{

  int regi;

  register greg_t *regp = (greg_t *) (gregsetp->gp_regs);

  /* same FIXME as above wrt 32 */

  for (regi = 0; regi < 32; regi++)

    if ((regno == -1) || (regno == regi))

      *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];

  if ((regno == -1) || (regno == PC_REGNUM))

    gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];

  if ((regno == -1) || (regno == CAUSE_REGNUM))

    gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];

  if ((regno == -1) || (regno == HI_REGNUM))

    gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];

  if ((regno == -1) || (regno == LO_REGNUM))

    gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];

}

/*

 * Now we do the same thing for floating-point registers.

 * We don't bother to condition on FP0_REGNUM since any

 * reasonable MIPS configuration has an R3010 in it.

 *

 * Again, see the comments in m68k-tdep.c.

 */

void

supply_fpregset (fpregsetp)

     fpregset_t *fpregsetp;

{

  register int regi;

  static char zerobuf[MAX_REGISTER_RAW_SIZE] =

  {0};

  for (regi = 0; regi < 32; regi++)

    supply_register (FP0_REGNUM + regi,

                     (char *) &fpregsetp->fp_r.fp_regs[regi]);

  supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);

  /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */

  supply_register (FCRIR_REGNUM, zerobuf);

}

void

fill_fpregset (fpregsetp, regno)

     fpregset_t *fpregsetp;

     int regno;

{

  int regi;

  char *from, *to;

  for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)

    {

      if ((regno == -1) || (regno == regi))

        {

          from = (char *) &registers[REGISTER_BYTE (regi)];

          to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);

          memcpy (to, from, REGISTER_RAW_SIZE (regi));

        }

    }

  if ((regno == -1) || (regno == FCRCS_REGNUM))

    fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];

}

/* Figure out where the longjmp will land.

   We expect the first arg to be a pointer to the jmp_buf structure from which

   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.

   This routine returns true on success. */

int

get_longjmp_target (pc)

     CORE_ADDR *pc;

{

  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];

  CORE_ADDR jb_addr;

  jb_addr = read_register (A0_REGNUM);

  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,

                          TARGET_PTR_BIT / TARGET_CHAR_BIT))

    return 0;

  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);

  return 1;

}

static void

fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)

     char *core_reg_sect;

     unsigned core_reg_size;

     int which;                 /* Unused */

     CORE_ADDR reg_addr;        /* Unused */

{

  if (core_reg_size != REGISTER_BYTES)

    {

      warning ("wrong size gregset struct in core file");

      return;

    }

  memcpy ((char *) registers, core_reg_sect, core_reg_size);

}

/* Register that we are able to handle irix4 core file formats.

   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns irix4_core_fns =

{

  bfd_target_unknown_flavour,           /* core_flavour */

  default_check_format,                 /* check_format */

  default_core_sniffer,                 /* core_sniffer */

  fetch_core_registers,                 /* core_read_registers */

  NULL                                  /* next */

};

void

_initialize_core_irix4 ()

{

  add_core_fns (&irix4_core_fns);

}