Subversion Repositories or1k

/* Native support for MIPS running SVR4, for GDB.

   Copyright 1994, 1995, 2000, 2001 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.  */

#include "defs.h"

#include "inferior.h"

#include "gdbcore.h"

#include "target.h"

#include "regcache.h"

#include <sys/time.h>

#include <sys/procfs.h>

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

/* Prototypes for supply_gregset etc. */

#include "gregset.h"

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

/*

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

 *

 * These definitions are from the MIPS SVR4 ABI, so they may work for

 * any MIPS SVR4 target.

 */

void

supply_gregset (gregset_t *gregsetp)

{

  register int regi;

  register greg_t *regp = &(*gregsetp)[0];

  static char zerobuf[MAX_REGISTER_RAW_SIZE] =

  {0};

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

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

  supply_register (PC_REGNUM, (char *) (regp + CXT_EPC));

  supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI));

  supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO));

  supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE));

  /* Fill inaccessible registers with zero.  */

  supply_register (PS_REGNUM, zerobuf);

  supply_register (BADVADDR_REGNUM, zerobuf);

  supply_register (FP_REGNUM, zerobuf);

  supply_register (UNUSED_REGNUM, zerobuf);

  for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)

    supply_register (regi, zerobuf);

}

void

fill_gregset (gregset_t *gregsetp, int regno)

{

  int regi;

  register greg_t *regp = &(*gregsetp)[0];

  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))

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

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

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

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

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

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

    *(regp + CXT_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 (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?  The ABI doesn't tell us. */

  supply_register (FCRIR_REGNUM, zerobuf);

}

void

fill_fpregset (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 (CORE_ADDR *pc)

{

  char *buf;

  CORE_ADDR jb_addr;

  buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);

  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;

}