m88k-nat.c   [plain text]

/* Native-dependent Motorola 88xxx support for GDB, the GNU Debugger.
   Copyright 1988, 1990, 1991, 1992, 1993, 1995, 1999, 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 "frame.h"
#include "inferior.h"
#include "regcache.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include "gdbcore.h"
#include <sys/user.h>

#ifndef USER			/* added to support BCS ptrace_user */
#define USER ptrace_user
#endif
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/file.h>
#include "gdb_stat.h"

#include "symtab.h"
#include "setjmp.h"
#include "value.h"

#ifdef DELTA88
#include <sys/ptrace.h>

/* define offsets to the pc instruction offsets in ptrace_user struct */
#define SXIP_OFFSET ((char *)&u.pt_sigframe.sig_sxip - (char *)&u)
#define SNIP_OFFSET ((char *)&u.pt_sigframe.sig_snip - (char *)&u)
#define SFIP_OFFSET ((char *)&u.pt_sigframe.sig_sfip - (char *)&u)
#else
/* define offsets to the pc instruction offsets in ptrace_user struct */
#define SXIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sxip - (char *)&u)
#define SNIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_snip - (char *)&u)
#define SFIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u)
#endif

extern int have_symbol_file_p ();

extern jmp_buf stack_jmp;

extern int errno;

void
fetch_inferior_registers (int regno)
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  register int i;

  struct USER u;
  unsigned int offset;

  offset = (char *) &u.pt_r0 - (char *) &u;
  regaddr = offset;		/* byte offset to r0; */

/*  offset = ptrace (3, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) offset, 0) - KERNEL_U_ADDR; */
  for (regno = 0; regno < NUM_REGS; regno++)
    {
      /*regaddr = register_addr (regno, offset); */
      /* 88k enhancement  */

      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	{
	  *(int *) &buf[i] = ptrace (3, PIDGET (inferior_ptid),
				     (PTRACE_ARG3_TYPE) regaddr, 0);
	  regaddr += sizeof (int);
	}
      supply_register (regno, buf);
    }
  /* now load up registers 36 - 38; special pc registers */
  *(int *) &buf[0] = ptrace (3, PIDGET (inferior_ptid),
			     (PTRACE_ARG3_TYPE) SXIP_OFFSET, 0);
  supply_register (SXIP_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, PIDGET (inferior_ptid),
			     (PTRACE_ARG3_TYPE) SNIP_OFFSET, 0);
  supply_register (SNIP_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, PIDGET (inferior_ptid),
			     (PTRACE_ARG3_TYPE) SFIP_OFFSET, 0);
  supply_register (SFIP_REGNUM, buf);
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */

void
store_inferior_registers (int regno)
{
  register unsigned int regaddr;
  char buf[80];

  struct USER u;

  unsigned int offset = (char *) &u.pt_r0 - (char *) &u;

  regaddr = offset;

  /* Don't try to deal with EXIP_REGNUM or ENIP_REGNUM, because I think either
     svr3 doesn't run on an 88110, or the kernel isolates the different (not
     completely sure this is true, but seems to be.  */
  if (regno >= 0)
    {
      /*      regaddr = register_addr (regno, offset); */
      if (regno < PC_REGNUM)
	{
	  regaddr = offset + regno * sizeof (int);
	  errno = 0;
	  ptrace (6, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      else if (regno == SXIP_REGNUM)
	ptrace (6, PIDGET (inferior_ptid),
		(PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (regno));
      else if (regno == SNIP_REGNUM)
	ptrace (6, PIDGET (inferior_ptid),
		(PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (regno));
      else if (regno == SFIP_REGNUM)
	ptrace (6, PIDGET (inferior_ptid),
		(PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (regno));
      else
	printf_unfiltered ("Bad register number for store_inferior routine\n");
    }
  else
    {
      for (regno = 0; regno < PC_REGNUM; regno++)
	{
	  /*      regaddr = register_addr (regno, offset); */
	  errno = 0;
	  regaddr = offset + regno * sizeof (int);
	  ptrace (6, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      ptrace (6, PIDGET (inferior_ptid),
	      (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (SXIP_REGNUM));
      ptrace (6, PIDGET (inferior_ptid),
	      (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (SNIP_REGNUM));
      ptrace (6, PIDGET (inferior_ptid),
	      (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (SFIP_REGNUM));
    }
}


/* blockend is the address of the end of the user structure */
m88k_register_u_addr (int blockend, int regnum)
{
  struct USER u;
  int ustart = blockend - sizeof (struct USER);
  switch (regnum)
    {
    case 0:
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
    case 8:
    case 9:
    case 10:
    case 11:
    case 12:
    case 13:
    case 14:
    case 15:
    case 16:
    case 17:
    case 18:
    case 19:
    case 20:
    case 21:
    case 22:
    case 23:
    case 24:
    case 25:
    case 26:
    case 27:
    case 28:
    case 29:
    case 30:
    case 31:
      return (ustart + ((int) &u.pt_r0 - (int) &u) + REGISTER_SIZE * regnum);
    case PSR_REGNUM:
      return (ustart + ((int) &u.pt_psr - (int) &u));
    case FPSR_REGNUM:
      return (ustart + ((int) &u.pt_fpsr - (int) &u));
    case FPCR_REGNUM:
      return (ustart + ((int) &u.pt_fpcr - (int) &u));
    case SXIP_REGNUM:
      return (ustart + SXIP_OFFSET);
    case SNIP_REGNUM:
      return (ustart + SNIP_OFFSET);
    case SFIP_REGNUM:
      return (ustart + SFIP_OFFSET);
    default:
      if (regnum < NUM_REGS)
	/* The register is one of those which is not defined...
	   give it zero */
	return (ustart + ((int) &u.pt_r0 - (int) &u));
      else
	return (blockend + REGISTER_SIZE * regnum);
    }
}

#ifdef USE_PROC_FS

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc. */
#include "gregset.h"

/*  Given a pointer to a general register set in /proc format (gregset_t *),
   unpack the register contents and supply them as gdb's idea of the current
   register values. */

void
supply_gregset (gregset_t *gregsetp)
{
  register int regi;
  register greg_t *regp = (greg_t *) gregsetp;

  for (regi = 0; regi <= SP_REGNUM; regi++)
    supply_register (regi, (char *) (regp + regi));

  supply_register (SXIP_REGNUM, (char *) (regp + R_XIP));
  supply_register (SNIP_REGNUM, (char *) (regp + R_NIP));
  supply_register (SFIP_REGNUM, (char *) (regp + R_FIP));
  supply_register (PSR_REGNUM, (char *) (regp + R_PSR));
  supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
  supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
}

void
fill_gregset (gregset_t *gregsetp, int regno)
{
  int regi;
  register greg_t *regp = (greg_t *) gregsetp;

  for (regi = 0; regi <= R_R31; regi++)
    if ((regno == -1) || (regno == regi))
      *(regp + regi) = *(int *) &registers[REGISTER_BYTE (regi)];

  if ((regno == -1) || (regno == SXIP_REGNUM))
    *(regp + R_XIP) = *(int *) &registers[REGISTER_BYTE (SXIP_REGNUM)];
  if ((regno == -1) || (regno == SNIP_REGNUM))
    *(regp + R_NIP) = *(int *) &registers[REGISTER_BYTE (SNIP_REGNUM)];
  if ((regno == -1) || (regno == SFIP_REGNUM))
    *(regp + R_FIP) = *(int *) &registers[REGISTER_BYTE (SFIP_REGNUM)];
  if ((regno == -1) || (regno == PSR_REGNUM))
    *(regp + R_PSR) = *(int *) &registers[REGISTER_BYTE (PSR_REGNUM)];
  if ((regno == -1) || (regno == FPSR_REGNUM))
    *(regp + R_FPSR) = *(int *) &registers[REGISTER_BYTE (FPSR_REGNUM)];
  if ((regno == -1) || (regno == FPCR_REGNUM))
    *(regp + R_FPCR) = *(int *) &registers[REGISTER_BYTE (FPCR_REGNUM)];
}

#endif /* USE_PROC_FS */