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/* Intel 386 native support.

   Copyright (C) 1988, 1989, 1991, 1992 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 "language.h"

#include "gdbcore.h"

#ifdef USG

#include <sys/types.h>

#endif

#include <sys/param.h>

#include <sys/dir.h>

#include <signal.h>

#include <sys/user.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#include <sys/file.h>

#include "gdb_stat.h"

#include <stddef.h>

#include <sys/ptrace.h>

/* Does AIX define this in <errno.h>?  */

extern int errno;

#ifdef HAVE_SYS_REG_H

#include <sys/reg.h>

#endif

#include "floatformat.h"

#include "target.h"

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

/* this table must line up with REGISTER_NAMES in tm-i386v.h */

/* symbols like 'EAX' come from <sys/reg.h> */

static int regmap[] =

{

  EAX, ECX, EDX, EBX,

  USP, EBP, ESI, EDI,

  EIP, EFL, CS, SS,

  DS, ES, FS, GS,

};

/* blockend is the value of u.u_ar0, and points to the

 * place where GS is stored

 */

int

i386_register_u_addr (blockend, regnum)

     int blockend;

     int regnum;

{

#if 0

  /* this will be needed if fp registers are reinstated */

  /* for now, you can look at them with 'info float'

   * sys5 wont let you change them with ptrace anyway

   */

  if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)

    {

      int ubase, fpstate;

      struct user u;

      ubase = blockend + 4 * (SS + 1) - KSTKSZ;

      fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u);

      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));

    }

  else

#endif

    return (blockend + 4 * regmap[regnum]);

}

/* The code below only work on the aix ps/2 (i386-ibm-aix) -

 * mtranle@paris - Sat Apr 11 10:34:12 1992

 */

struct env387

{

  unsigned short control;

  unsigned short r0;

  unsigned short status;

  unsigned short r1;

  unsigned short tag;

  unsigned short r2;

  unsigned long eip;

  unsigned short code_seg;

  unsigned short opcode;

  unsigned long operand;

  unsigned short operand_seg;

  unsigned short r3;

  unsigned char regs[8][10];

};

static

print_387_status (status, ep)

     unsigned short status;

     struct env387 *ep;

{

  int i;

  int bothstatus;

  int top;

  int fpreg;

  unsigned char *p;

  bothstatus = ((status != 0) && (ep->status != 0));

  if (status != 0)

    {

      if (bothstatus)

        printf_unfiltered ("u: ");

      print_387_status_word (status);

    }

  if (ep->status != 0)

    {

      if (bothstatus)

        printf_unfiltered ("e: ");

      print_387_status_word (ep->status);

    }

  print_387_control_word (ep->control);

  printf_unfiltered ("last exception: ");

  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));

  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));

  printf_unfiltered ("%s; ", local_hex_string (ep->eip));

  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));

  printf_unfiltered (":%s\n", local_hex_string (ep->operand));

  top = ((ep->status >> 11) & 7);

  printf_unfiltered ("regno  tag  msb              lsb  value\n");

  for (fpreg = 7; fpreg >= 0; fpreg--)

    {

      double val;

      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);

      switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)

        {

        case 0:

          printf_unfiltered ("valid ");

          break;

        case 1:

          printf_unfiltered ("zero  ");

          break;

        case 2:

          printf_unfiltered ("trap  ");

          break;

        case 3:

          printf_unfiltered ("empty ");

          break;

        }

      for (i = 9; i >= 0; i--)

        printf_unfiltered ("%02x", ep->regs[fpreg][i]);

      i387_to_double ((char *) ep->regs[fpreg], (char *) &val);

      printf_unfiltered ("  %#g\n", val);

    }

}

static struct env387 core_env387;

void

i386_float_info ()

{

  struct env387 fps;

  int fpsaved = 0;

  /* We need to reverse the order of the registers.  Apparently AIX stores

     the highest-numbered ones first.  */

  struct env387 fps_fixed;

  int i;

  if (inferior_pid)

    {

      char buf[10];

      unsigned short status;

      ptrace (PT_READ_FPR, inferior_pid, buf, offsetof (struct env387, status));

      memcpy (&status, buf, sizeof (status));

      fpsaved = status;

    }

  else

    {

      if ((fpsaved = core_env387.status) != 0)

        memcpy (&fps, &core_env387, sizeof (fps));

    }

  if (fpsaved == 0)

    {

      printf_unfiltered ("no floating point status saved\n");

      return;

    }

  if (inferior_pid)

    {

      int offset;

      for (offset = 0; offset < sizeof (fps); offset += 10)

        {

          char buf[10];

          ptrace (PT_READ_FPR, inferior_pid, buf, offset);

          memcpy ((char *) &fps.control + offset, buf,

                  MIN (10, sizeof (fps) - offset));

        }

    }

  fps_fixed = fps;

  for (i = 0; i < 8; ++i)

    memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);

  print_387_status (0, &fps_fixed);

}

/* Fetch one register.  */

static void

fetch_register (regno)

     int regno;

{

  char buf[MAX_REGISTER_RAW_SIZE];

  if (regno < FP0_REGNUM)

    *(int *) buf = ptrace (PT_READ_GPR, inferior_pid,

                           PT_REG (regmap[regno]), 0, 0);

  else

    ptrace (PT_READ_FPR, inferior_pid, buf,

            (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));

  supply_register (regno, buf);

}

void

fetch_inferior_registers (regno)

     int regno;

{

  if (regno < 0)

    for (regno = 0; regno < NUM_REGS; regno++)

      fetch_register (regno);

  else

    fetch_register (regno);

}

/* store one register */

static void

store_register (regno)

     int regno;

{

  char buf[80];

  errno = 0;

  if (regno < FP0_REGNUM)

    ptrace (PT_WRITE_GPR, inferior_pid, PT_REG (regmap[regno]),

            *(int *) &registers[REGISTER_BYTE (regno)], 0);

  else

    ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],

            (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));

  if (errno != 0)

    {

      sprintf (buf, "writing register number %d", regno);

      perror_with_name (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 (regno)

     int regno;

{

  if (regno < 0)

    for (regno = 0; regno < NUM_REGS; regno++)

      store_register (regno);

  else

    store_register (regno);

}

#ifndef CD_AX                   /* defined in sys/i386/coredump.h */

#define CD_AX   0

#define CD_BX   1

#define CD_CX   2

#define CD_DX   3

#define CD_SI   4

#define CD_DI   5

#define CD_BP   6

#define CD_SP   7

#define CD_FL   8

#define CD_IP   9

#define CD_CS   10

#define CD_DS   11

#define CD_ES   12

#define CD_FS   13

#define CD_GS   14

#define CD_SS   15

#endif

/*

 * The order here in core_regmap[] has to be the same as in

 * regmap[] above.

 */

static int core_regmap[] =

{

  CD_AX, CD_CX, CD_DX, CD_BX,

  CD_SP, CD_BP, CD_SI, CD_DI,

  CD_IP, CD_FL, CD_CS, CD_SS,

  CD_DS, CD_ES, CD_FS, CD_GS,

};

static void

fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)

     char *core_reg_sect;

     unsigned core_reg_size;

     int which;

     CORE_ADDR reg_addr;        /* ignored */

{

  if (which == 0)

    {

      /* Integer registers */

#define cd_regs(n) ((int *)core_reg_sect)[n]

#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])

      int i;

      for (i = 0; i < FP0_REGNUM; i++)

        regs (i) = cd_regs (core_regmap[i]);

    }

  else if (which == 2)

    {

      /* Floating point registers */

      if (core_reg_size >= sizeof (core_env387))

        memcpy (&core_env387, core_reg_sect, core_reg_size);

      else

        fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");

    }

}

/* Register that we are able to handle i386aix core file formats.

   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns i386aix_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_i386aix ()

{

  add_core_fns (&i386aix_core_fns);

}