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[/] [or1k/] [trunk/] [insight/] [gdb/] [i386v-nat.c] - Blame information for rev 1765

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1 578 markom
/* Intel 386 native support for SYSV systems (pre-SVR4).
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   Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
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   2000 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include "defs.h"
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#ifdef HAVE_PTRACE_H
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#include <ptrace.h>
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#else
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#ifdef HAVE_SYS_PTRACE_H
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#include <sys/ptrace.h>
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#endif
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#endif
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#include "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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/* FIXME: The following used to be just "#include <sys/debugreg.h>", but
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 * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
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 * <sys/debugreg.h> will result in an error.  With luck, these losers
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 * will get their act together and we can trash this hack in the near future.
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 * --jsm 1998-10-21
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 */
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#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
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#ifdef HAVE_ASM_DEBUGREG_H
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#include <asm/debugreg.h>
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#else
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#include <sys/debugreg.h>
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#endif
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#endif
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#include <sys/file.h>
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#include "gdb_stat.h"
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include "floatformat.h"
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#include "target.h"
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/* this table must line up with REGISTER_NAMES in tm-i386v.h */
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/* symbols like 'EAX' come from <sys/reg.h> */
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static int regmap[] =
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{
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  EAX, ECX, EDX, EBX,
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  UESP, EBP, ESI, EDI,
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  EIP, EFL, CS, SS,
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  DS, ES, FS, GS,
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};
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/* blockend is the value of u.u_ar0, and points to the
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 * place where GS is stored
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 */
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int
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i386_register_u_addr (int blockend, int regnum)
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{
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  struct user u;
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  int fpstate;
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  int ubase;
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  ubase = blockend;
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  /* FIXME:  Should have better way to test floating point range */
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  if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7))
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    {
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#ifdef KSTKSZ                   /* SCO, and others? */
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      ubase += 4 * (SS + 1) - KSTKSZ;
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      fpstate = ubase + ((char *) &u.u_fps.u_fpstate - (char *) &u);
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      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
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#else
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      fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
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      return (fpstate + 10 * (regnum - FP0_REGNUM));
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#endif
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    }
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  else
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    {
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      return (ubase + 4 * regmap[regnum]);
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    }
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}
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int
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kernel_u_size (void)
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{
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  return (sizeof (struct user));
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}
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#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
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#if !defined (offsetof)
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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/* Record the value of the debug control register.  */
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static int debug_control_mirror;
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/* Record which address associates with which register.  */
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static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
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static int
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i386_insert_aligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int);
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static int
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i386_insert_nonaligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int);
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/* Insert a watchpoint.  */
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int
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i386_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
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{
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  return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
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}
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static int
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i386_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
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                                int len, int rw)
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{
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  int i;
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  int read_write_bits, len_bits;
155
  int free_debug_register;
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  int register_number;
157
 
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  /* Look for a free debug register.  */
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  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
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    {
161
      if (address_lookup[i - DR_FIRSTADDR] == 0)
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        break;
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    }
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  /* No more debug registers!  */
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  if (i > DR_LASTADDR)
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    return -1;
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  read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
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  if (len == 1)
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    len_bits = DR_LEN_1;
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  else if (len == 2)
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    {
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      if (addr % 2)
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        return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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      len_bits = DR_LEN_2;
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    }
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180
  else if (len == 4)
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    {
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      if (addr % 4)
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        return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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      len_bits = DR_LEN_4;
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    }
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  else
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    return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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  free_debug_register = i;
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  register_number = free_debug_register - DR_FIRSTADDR;
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  debug_control_mirror |=
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    ((read_write_bits | len_bits)
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     << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
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  debug_control_mirror |=
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    (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
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  debug_control_mirror |= DR_LOCAL_SLOWDOWN;
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  debug_control_mirror &= ~DR_CONTROL_RESERVED;
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  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
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          debug_control_mirror);
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  ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
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          addr);
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  /* Record where we came from.  */
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  address_lookup[register_number] = addr;
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  return 0;
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}
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209
static int
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i386_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
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                                   int len, int rw)
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{
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  int align;
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  int size;
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  int rv;
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  static int size_try_array[4][4] =
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  {
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    { 1, 1, 1, 1 },             /* trying size one */
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    { 2, 1, 2, 1 },             /* trying size two */
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    { 2, 1, 2, 1 },             /* trying size three */
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    { 4, 1, 2, 1 }              /* trying size four */
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  };
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  rv = 0;
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  while (len > 0)
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    {
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      align = addr % 4;
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      /* Four is the maximum length for 386.  */
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      size = size_try_array[len > 4 ? 3 : len - 1][align];
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      rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
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      if (rv)
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        {
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          i386_remove_watchpoint (pid, waddr, size);
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          return rv;
237
        }
238
      addr += size;
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      len -= size;
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    }
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  return rv;
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}
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/* Remove a watchpoint.  */
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246
int
247
i386_remove_watchpoint (int pid, CORE_ADDR addr, int len)
248
{
249
  int i;
250
  int register_number;
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252
  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
253
    {
254
      register_number = i - DR_FIRSTADDR;
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      if (address_lookup[register_number] == addr)
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        {
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          debug_control_mirror &=
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            ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
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          address_lookup[register_number] = 0;
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        }
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    }
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  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
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          debug_control_mirror);
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  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
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266
  return 0;
267
}
268
 
269
/* Check if stopped by a watchpoint.  */
270
 
271
CORE_ADDR
272
i386_stopped_by_watchpoint (int pid)
273
{
274
  int i;
275
  int status;
276
 
277
  status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
278
  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
279
 
280
  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
281
    {
282
      if (status & (1 << (i - DR_FIRSTADDR)))
283
        return address_lookup[i - DR_FIRSTADDR];
284
    }
285
 
286
  return 0;
287
}
288
 
289
#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */

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