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/* Native support for Sun 386i's for GDB, the GNU debugger.

   Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.

   Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),

   C2V Paris, April 89.

   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 "gdbcore.h"

#include <sys/param.h>

#include <sys/dir.h>

#include <sys/user.h>

#include <signal.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#include <sys/file.h>

#include "gdb_stat.h"

#include <sys/core.h>

/* Machine-dependent code which would otherwise be in corefile.c */

/* Work with core files, for GDB. */

void

core_file_command (filename, from_tty)

     char *filename;

     int from_tty;

{

  int val;

  /* Discard all vestiges of any previous core file

     and mark data and stack spaces as empty.  */

  if (corefile)

    free (corefile);

  corefile = 0;

  if (corechan >= 0)

    close (corechan);

  corechan = -1;

  data_start = 0;

  data_end = 0;

  stack_start = STACK_END_ADDR;

  stack_end = STACK_END_ADDR;

  /* Now, if a new core file was specified, open it and digest it.  */

  if (filename)

    {

      filename = tilde_expand (filename);

      make_cleanup (free, filename);

      if (have_inferior_p ())

        error ("To look at a core file, you must kill the program with \"kill\".");

      corechan = open (filename, O_RDONLY, 0);

      if (corechan < 0)

        perror_with_name (filename);

      {

        struct core corestr;

        val = myread (corechan, &corestr, sizeof corestr);

        if (val < 0)

          perror_with_name (filename);

        if (corestr.c_magic != CORE_MAGIC)

          error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",

                 filename, corestr.c_magic, (int) CORE_MAGIC);

        else if (sizeof (struct core) != corestr.c_len)

            error ("\"%s\" has an invalid struct core length (%d, expected %d)",

                   filename, corestr.c_len, (int) sizeof (struct core));

        data_start = exec_data_start;

        data_end = data_start + corestr.c_dsize;

        stack_start = stack_end - corestr.c_ssize;

        data_offset = sizeof corestr;

        stack_offset = sizeof corestr + corestr.c_dsize;

        memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);

        memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],

                corestr.c_fpu.f_fpstatus.f_st,

                sizeof corestr.c_fpu.f_fpstatus.f_st);

        memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],

                &corestr.c_fpu.f_fpstatus.f_ctrl,

                sizeof corestr.c_fpu.f_fpstatus -

                sizeof corestr.c_fpu.f_fpstatus.f_st);

        /* the struct aouthdr of sun coff is not the struct exec stored

           in the core file. */

        memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));

#ifndef COFF_ENCAPSULATE

        core_aouthdr.magic = corestr.c_aouthdr.a_info;

        core_aouthdr.vstamp = /*SUNVERSION */ 31252;

#endif

        printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);

        if (corestr.c_signo > 0)

          printf_unfiltered ("Program terminated with signal %d, %s.\n",

                         corestr.c_signo, safe_strsignal (corestr.c_signo));

      }

      if (filename[0] == '/')

        corefile = savestring (filename, strlen (filename));

      else

        {

          corefile = concat (current_directory, "/", filename, NULL);

        }

      flush_cached_frames ();

      select_frame (get_current_frame (), 0);

      validate_files ();

    }

  else if (from_tty)

    printf_unfiltered ("No core file now.\n");

}

i387_to_double (from, to)

     char *from;

     char *to;

{

  long *lp;

  /* push extended mode on 387 stack, then pop in double mode

   * first, set exception masks so no error is generated -

   * number will be rounded to inf or 0, if necessary

   */

  asm ("pushl %eax");           /* grab a stack slot */

  asm ("fstcw (%esp)");         /* get 387 control word */

  asm ("movl (%esp),%eax");     /* save old value */

  asm ("orl $0x3f,%eax");       /* mask all exceptions */

  asm ("pushl %eax");

  asm ("fldcw (%esp)");         /* load new value into 387 */

  asm ("movl 8(%ebp),%eax");

  asm ("fldt (%eax)");          /* push extended number on 387 stack */

  asm ("fwait");

  asm ("movl 12(%ebp),%eax");

  asm ("fstpl (%eax)");         /* pop double */

  asm ("fwait");

  asm ("popl %eax");            /* flush modified control word */

  asm ("fnclex");               /* clear exceptions */

  asm ("fldcw (%esp)");         /* restore original control word */

  asm ("popl %eax");            /* flush saved copy */

}

double_to_i387 (from, to)

     char *from;

     char *to;

{

  /* push double mode on 387 stack, then pop in extended mode

   * no errors are possible because every 64-bit pattern

   * can be converted to an extended

   */

  asm ("movl 8(%ebp),%eax");

  asm ("fldl (%eax)");

  asm ("fwait");

  asm ("movl 12(%ebp),%eax");

  asm ("fstpt (%eax)");

  asm ("fwait");

}

void

fetch_inferior_registers (regno)

     int regno;

{

  struct regs inferior_registers;

  struct fp_state inferior_fp_registers;

  registers_fetched ();

  ptrace (PTRACE_GETREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_registers);

  ptrace (PTRACE_GETFPREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_fp_registers);

  memcpy (registers, &inferior_registers, sizeof inferior_registers);

  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st,

          sizeof inferior_fp_registers.f_st);

  memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],

          &inferior_fp_registers.f_ctrl,

          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);

}

/* 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;

{

  struct regs inferior_registers;

  struct fp_state inferior_fp_registers;

  memcpy (&inferior_registers, registers, 20 * 4);

  memcpy (inferior_fp_registers.f_st,

          &registers[REGISTER_BYTE (FP0_REGNUM)],

          sizeof inferior_fp_registers.f_st);

  memcpy (&inferior_fp_registers.f_ctrl,

          &registers[REGISTER_BYTE (FPC_REGNUM)],

          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);

#ifdef PTRACE_FP_BUG

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

    /* Storing the frame pointer requires a gross hack, in which an

       instruction that moves eax into ebp gets single-stepped.  */

    {

      int stack = inferior_registers.r_reg[SP_REGNUM];

      int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,

                          (PTRACE_ARG3_TYPE) stack);

      int reg = inferior_registers.r_reg[EAX];

      inferior_registers.r_reg[EAX] =

        inferior_registers.r_reg[FP_REGNUM];

      ptrace (PTRACE_SETREGS, inferior_pid,

              (PTRACE_ARG3_TYPE) & inferior_registers);

      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,

              0xc589);

      ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,

              0);

      wait (0);

      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,

              stuff);

      inferior_registers.r_reg[EAX] = reg;

    }

#endif

  ptrace (PTRACE_SETREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_registers);

  ptrace (PTRACE_SETFPREGS, inferior_pid,

          (PTRACE_ARG3_TYPE) & inferior_fp_registers);

}