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/* Low level interface to ptrace, for the remote server for GDB.

   Copyright (C) 1995 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 <sys/wait.h>

#include "frame.h"

#include "inferior.h"

#include <stdio.h>

#include <sys/param.h>

#include <sys/dir.h>

#include <sys/user.h>

#include <signal.h>

#include <sys/ioctl.h>

#include <sgtty.h>

#include <fcntl.h>

/***************Begin MY defs*********************/

int quit_flag = 0;

static char my_registers[REGISTER_BYTES];

char *registers = my_registers;

/* Index within `registers' of the first byte of the space for

   register N.  */

char buf2[MAX_REGISTER_RAW_SIZE];

/***************End MY defs*********************/

#include <sys/ptrace.h>

#include <machine/reg.h>

extern char **environ;

extern int errno;

extern int inferior_pid;

void quit (), perror_with_name ();

int query ();

/* Start an inferior process and returns its pid.

   ALLARGS is a vector of program-name and args.

   ENV is the environment vector to pass.  */

int

create_inferior (program, allargs)

     char *program;

     char **allargs;

{

  int pid;

  pid = fork ();

  if (pid < 0)

    perror_with_name ("fork");

  if (pid == 0)

    {

      ptrace (PT_TRACE_ME, 0, 0, 0, 0);

      execv (program, allargs);

      fprintf (stderr, "Cannot exec %s: %s.\n", program,

               errno < sys_nerr ? sys_errlist[errno] : "unknown error");

      fflush (stderr);

      _exit (0177);

    }

  return pid;

}

/* Kill the inferior process.  Make us have no inferior.  */

void

kill_inferior ()

{

  if (inferior_pid == 0)

    return;

  ptrace (8, inferior_pid, 0, 0, 0);

  wait (0);

/*************inferior_died ();****VK**************/

}

/* Return nonzero if the given thread is still alive.  */

int

mythread_alive (pid)

     int pid;

{

  return 1;

}

/* Wait for process, returns status */

unsigned char

mywait (status)

     char *status;

{

  int pid;

  union wait w;

  pid = wait (&w);

  if (pid != inferior_pid)

    perror_with_name ("wait");

  if (WIFEXITED (w))

    {

      fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));

      *status = 'W';

      return ((unsigned char) WEXITSTATUS (w));

    }

  else if (!WIFSTOPPED (w))

    {

      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));

      *status = 'X';

      return ((unsigned char) WTERMSIG (w));

    }

  fetch_inferior_registers (0);

  *status = 'T';

  return ((unsigned char) WSTOPSIG (w));

}

/* Resume execution of the inferior process.

   If STEP is nonzero, single-step it.

   If SIGNAL is nonzero, give it that signal.  */

void

myresume (step, signal)

     int step;

     int signal;

{

  errno = 0;

  ptrace (step ? PT_STEP : PT_CONTINUE, inferior_pid, 1, signal, 0);

  if (errno)

    perror_with_name ("ptrace");

}

#if !defined (offsetof)

#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)

#endif

/* U_REGS_OFFSET is the offset of the registers within the u area.  */

#if !defined (U_REGS_OFFSET)

#define U_REGS_OFFSET \

  ptrace (PT_READ_U, inferior_pid, \

          (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \

    - KERNEL_U_ADDR

#endif

CORE_ADDR

register_addr (regno, blockend)

     int regno;

     CORE_ADDR blockend;

{

  CORE_ADDR addr;

  if (regno < 0 || regno >= ARCH_NUM_REGS)

    error ("Invalid register number %d.", regno);

  REGISTER_U_ADDR (addr, blockend, regno);

  return addr;

}

/* Fetch one register.  */

static void

fetch_register (regno)

     int regno;

{

  register unsigned int regaddr;

  char buf[MAX_REGISTER_RAW_SIZE];

  register int i;

  /* Offset of registers within the u area.  */

  unsigned int offset;

  offset = U_REGS_OFFSET;

  regaddr = register_addr (regno, offset);

  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))

    {

      errno = 0;

      *(int *) &registers[regno * 4 + i] = ptrace (PT_RUREGS, inferior_pid,

                                          (PTRACE_ARG3_TYPE) regaddr, 0, 0);

      regaddr += sizeof (int);

      if (errno != 0)

        {

          /* Warning, not error, in case we are attached; sometimes the

             kernel doesn't let us at the registers.  */

          char *err = strerror (errno);

          char *msg = alloca (strlen (err) + 128);

          sprintf (msg, "reading register %d: %s", regno, err);

          error (msg);

          goto error_exit;

        }

    }

error_exit:;

}

/* Fetch all registers, or just one, from the child process.  */

void

fetch_inferior_registers (regno)

     int regno;

{

  if (regno == -1 || regno == 0)

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

      fetch_register (regno);

  else

    fetch_register (regno);

}

/* 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;

{

  register unsigned int regaddr;

  char buf[80];

  extern char registers[];

  register int i;

  unsigned int offset = U_REGS_OFFSET;

  int scratch;

  if (regno >= 0)

    {

      if (CANNOT_STORE_REGISTER (regno))

        return;

      regaddr = register_addr (regno, offset);

      errno = 0;

      if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)

        {

          scratch = *(int *) &registers[REGISTER_BYTE (regno)] | 0x3;

          ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,

                  scratch, 0);

          if (errno != 0)

            {

              /* Error, even if attached.  Failing to write these two

                 registers is pretty serious.  */

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

              perror_with_name (buf);

            }

        }

      else

        for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))

          {

            errno = 0;

            ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,

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

            if (errno != 0)

              {

                /* Warning, not error, in case we are attached; sometimes the

                   kernel doesn't let us at the registers.  */

                char *err = strerror (errno);

                char *msg = alloca (strlen (err) + 128);

                sprintf (msg, "writing register %d: %s",

                         regno, err);

                error (msg);

                return;

              }

            regaddr += sizeof (int);

          }

    }

  else

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

      store_inferior_registers (regno);

}

/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory

   in the NEW_SUN_PTRACE case.

   It ought to be straightforward.  But it appears that writing did

   not write the data that I specified.  I cannot understand where

   it got the data that it actually did write.  */

/* Copy LEN bytes from inferior's memory starting at MEMADDR

   to debugger memory starting at MYADDR.  */

read_inferior_memory (memaddr, myaddr, len)

     CORE_ADDR memaddr;

     char *myaddr;

     int len;

{

  register int i;

  /* Round starting address down to longword boundary.  */

  register CORE_ADDR addr = memaddr & -sizeof (int);

  /* Round ending address up; get number of longwords that makes.  */

  register int count

  = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);

  /* Allocate buffer of that many longwords.  */

  register int *buffer = (int *) alloca (count * sizeof (int));

  /* Read all the longwords */

  for (i = 0; i < count; i++, addr += sizeof (int))

    {

      buffer[i] = ptrace (1, inferior_pid, addr, 0, 0);

    }

  /* Copy appropriate bytes out of the buffer.  */

  memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);

}

/* Copy LEN bytes of data from debugger memory at MYADDR

   to inferior's memory at MEMADDR.

   On failure (cannot write the inferior)

   returns the value of errno.  */

int

write_inferior_memory (memaddr, myaddr, len)

     CORE_ADDR memaddr;

     char *myaddr;

     int len;

{

  register int i;

  /* Round starting address down to longword boundary.  */

  register CORE_ADDR addr = memaddr & -sizeof (int);

  /* Round ending address up; get number of longwords that makes.  */

  register int count

  = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);

  /* Allocate buffer of that many longwords.  */

  register int *buffer = (int *) alloca (count * sizeof (int));

  extern int errno;

  /* Fill start and end extra bytes of buffer with existing memory data.  */

  buffer[0] = ptrace (1, inferior_pid, addr, 0, 0);

  if (count > 1)

    {

      buffer[count - 1]

        = ptrace (1, inferior_pid,

                  addr + (count - 1) * sizeof (int), 0, 0);

    }

  /* Copy data to be written over corresponding part of buffer */

  memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);

  /* Write the entire buffer.  */

  for (i = 0; i < count; i++, addr += sizeof (int))

    {

      errno = 0;

      ptrace (4, inferior_pid, addr, buffer[i], 0);

      if (errno)

        return errno;

    }

  return 0;

}

void

initialize_low ()

{

}