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/* Native-dependent code for the i386.
/* Native-dependent code for the i386.
 
 
   Copyright (C) 2001, 2004, 2005, 2007, 2008, 2009, 2010
   Copyright (C) 2001, 2004, 2005, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#include "i386-nat.h"
#include "i386-nat.h"
#include "defs.h"
#include "defs.h"
#include "breakpoint.h"
#include "breakpoint.h"
#include "command.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbcmd.h"
#include "target.h"
#include "target.h"
#include "gdb_assert.h"
#include "gdb_assert.h"
 
 
/* Support for hardware watchpoints and breakpoints using the i386
/* Support for hardware watchpoints and breakpoints using the i386
   debug registers.
   debug registers.
 
 
   This provides several functions for inserting and removing
   This provides several functions for inserting and removing
   hardware-assisted breakpoints and watchpoints, testing if one or
   hardware-assisted breakpoints and watchpoints, testing if one or
   more of the watchpoints triggered and at what address, checking
   more of the watchpoints triggered and at what address, checking
   whether a given region can be watched, etc.
   whether a given region can be watched, etc.
 
 
   The functions below implement debug registers sharing by reference
   The functions below implement debug registers sharing by reference
   counts, and allow to watch regions up to 16 bytes long.  */
   counts, and allow to watch regions up to 16 bytes long.  */
 
 
struct i386_dr_low_type i386_dr_low;
struct i386_dr_low_type i386_dr_low;
 
 
 
 
/* Support for 8-byte wide hw watchpoints.  */
/* Support for 8-byte wide hw watchpoints.  */
#define TARGET_HAS_DR_LEN_8 (i386_dr_low.debug_register_length == 8)
#define TARGET_HAS_DR_LEN_8 (i386_dr_low.debug_register_length == 8)
 
 
/* Debug registers' indices.  */
/* Debug registers' indices.  */
#define DR_NADDR        4       /* The number of debug address registers.  */
#define DR_NADDR        4       /* The number of debug address registers.  */
#define DR_STATUS       6       /* Index of debug status register (DR6).  */
#define DR_STATUS       6       /* Index of debug status register (DR6).  */
#define DR_CONTROL      7       /* Index of debug control register (DR7). */
#define DR_CONTROL      7       /* Index of debug control register (DR7). */
 
 
/* DR7 Debug Control register fields.  */
/* DR7 Debug Control register fields.  */
 
 
/* How many bits to skip in DR7 to get to R/W and LEN fields.  */
/* How many bits to skip in DR7 to get to R/W and LEN fields.  */
#define DR_CONTROL_SHIFT        16
#define DR_CONTROL_SHIFT        16
/* How many bits in DR7 per R/W and LEN field for each watchpoint.  */
/* How many bits in DR7 per R/W and LEN field for each watchpoint.  */
#define DR_CONTROL_SIZE         4
#define DR_CONTROL_SIZE         4
 
 
/* Watchpoint/breakpoint read/write fields in DR7.  */
/* Watchpoint/breakpoint read/write fields in DR7.  */
#define DR_RW_EXECUTE   (0x0)   /* Break on instruction execution.  */
#define DR_RW_EXECUTE   (0x0)   /* Break on instruction execution.  */
#define DR_RW_WRITE     (0x1)   /* Break on data writes.  */
#define DR_RW_WRITE     (0x1)   /* Break on data writes.  */
#define DR_RW_READ      (0x3)   /* Break on data reads or writes.  */
#define DR_RW_READ      (0x3)   /* Break on data reads or writes.  */
 
 
/* This is here for completeness.  No platform supports this
/* This is here for completeness.  No platform supports this
   functionality yet (as of March 2001).  Note that the DE flag in the
   functionality yet (as of March 2001).  Note that the DE flag in the
   CR4 register needs to be set to support this.  */
   CR4 register needs to be set to support this.  */
#ifndef DR_RW_IORW
#ifndef DR_RW_IORW
#define DR_RW_IORW      (0x2)   /* Break on I/O reads or writes.  */
#define DR_RW_IORW      (0x2)   /* Break on I/O reads or writes.  */
#endif
#endif
 
 
/* Watchpoint/breakpoint length fields in DR7.  The 2-bit left shift
/* Watchpoint/breakpoint length fields in DR7.  The 2-bit left shift
   is so we could OR this with the read/write field defined above.  */
   is so we could OR this with the read/write field defined above.  */
#define DR_LEN_1        (0x0 << 2) /* 1-byte region watch or breakpoint.  */
#define DR_LEN_1        (0x0 << 2) /* 1-byte region watch or breakpoint.  */
#define DR_LEN_2        (0x1 << 2) /* 2-byte region watch.  */
#define DR_LEN_2        (0x1 << 2) /* 2-byte region watch.  */
#define DR_LEN_4        (0x3 << 2) /* 4-byte region watch.  */
#define DR_LEN_4        (0x3 << 2) /* 4-byte region watch.  */
#define DR_LEN_8        (0x2 << 2) /* 8-byte region watch (AMD64).  */
#define DR_LEN_8        (0x2 << 2) /* 8-byte region watch (AMD64).  */
 
 
/* Local and Global Enable flags in DR7.
/* Local and Global Enable flags in DR7.
 
 
   When the Local Enable flag is set, the breakpoint/watchpoint is
   When the Local Enable flag is set, the breakpoint/watchpoint is
   enabled only for the current task; the processor automatically
   enabled only for the current task; the processor automatically
   clears this flag on every task switch.  When the Global Enable flag
   clears this flag on every task switch.  When the Global Enable flag
   is set, the breakpoint/watchpoint is enabled for all tasks; the
   is set, the breakpoint/watchpoint is enabled for all tasks; the
   processor never clears this flag.
   processor never clears this flag.
 
 
   Currently, all watchpoint are locally enabled.  If you need to
   Currently, all watchpoint are locally enabled.  If you need to
   enable them globally, read the comment which pertains to this in
   enable them globally, read the comment which pertains to this in
   i386_insert_aligned_watchpoint below.  */
   i386_insert_aligned_watchpoint below.  */
#define DR_LOCAL_ENABLE_SHIFT   0 /* Extra shift to the local enable bit.  */
#define DR_LOCAL_ENABLE_SHIFT   0 /* Extra shift to the local enable bit.  */
#define DR_GLOBAL_ENABLE_SHIFT  1 /* Extra shift to the global enable bit.  */
#define DR_GLOBAL_ENABLE_SHIFT  1 /* Extra shift to the global enable bit.  */
#define DR_ENABLE_SIZE          2 /* Two enable bits per debug register.  */
#define DR_ENABLE_SIZE          2 /* Two enable bits per debug register.  */
 
 
/* Local and global exact breakpoint enable flags (a.k.a. slowdown
/* Local and global exact breakpoint enable flags (a.k.a. slowdown
   flags).  These are only required on i386, to allow detection of the
   flags).  These are only required on i386, to allow detection of the
   exact instruction which caused a watchpoint to break; i486 and
   exact instruction which caused a watchpoint to break; i486 and
   later processors do that automatically.  We set these flags for
   later processors do that automatically.  We set these flags for
   backwards compatibility.  */
   backwards compatibility.  */
#define DR_LOCAL_SLOWDOWN       (0x100)
#define DR_LOCAL_SLOWDOWN       (0x100)
#define DR_GLOBAL_SLOWDOWN      (0x200)
#define DR_GLOBAL_SLOWDOWN      (0x200)
 
 
/* Fields reserved by Intel.  This includes the GD (General Detect
/* Fields reserved by Intel.  This includes the GD (General Detect
   Enable) flag, which causes a debug exception to be generated when a
   Enable) flag, which causes a debug exception to be generated when a
   MOV instruction accesses one of the debug registers.
   MOV instruction accesses one of the debug registers.
 
 
   FIXME: My Intel manual says we should use 0xF800, not 0xFC00.  */
   FIXME: My Intel manual says we should use 0xF800, not 0xFC00.  */
#define DR_CONTROL_RESERVED     (0xFC00)
#define DR_CONTROL_RESERVED     (0xFC00)
 
 
/* Auxiliary helper macros.  */
/* Auxiliary helper macros.  */
 
 
/* A value that masks all fields in DR7 that are reserved by Intel.  */
/* A value that masks all fields in DR7 that are reserved by Intel.  */
#define I386_DR_CONTROL_MASK    (~DR_CONTROL_RESERVED)
#define I386_DR_CONTROL_MASK    (~DR_CONTROL_RESERVED)
 
 
/* The I'th debug register is vacant if its Local and Global Enable
/* The I'th debug register is vacant if its Local and Global Enable
   bits are reset in the Debug Control register.  */
   bits are reset in the Debug Control register.  */
#define I386_DR_VACANT(i) \
#define I386_DR_VACANT(i) \
  ((dr_control_mirror & (3 << (DR_ENABLE_SIZE * (i)))) == 0)
  ((dr_control_mirror & (3 << (DR_ENABLE_SIZE * (i)))) == 0)
 
 
/* Locally enable the break/watchpoint in the I'th debug register.  */
/* Locally enable the break/watchpoint in the I'th debug register.  */
#define I386_DR_LOCAL_ENABLE(i) \
#define I386_DR_LOCAL_ENABLE(i) \
  dr_control_mirror |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i)))
  dr_control_mirror |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i)))
 
 
/* Globally enable the break/watchpoint in the I'th debug register.  */
/* Globally enable the break/watchpoint in the I'th debug register.  */
#define I386_DR_GLOBAL_ENABLE(i) \
#define I386_DR_GLOBAL_ENABLE(i) \
  dr_control_mirror |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i)))
  dr_control_mirror |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i)))
 
 
/* Disable the break/watchpoint in the I'th debug register.  */
/* Disable the break/watchpoint in the I'th debug register.  */
#define I386_DR_DISABLE(i) \
#define I386_DR_DISABLE(i) \
  dr_control_mirror &= ~(3 << (DR_ENABLE_SIZE * (i)))
  dr_control_mirror &= ~(3 << (DR_ENABLE_SIZE * (i)))
 
 
/* Set in DR7 the RW and LEN fields for the I'th debug register.  */
/* Set in DR7 the RW and LEN fields for the I'th debug register.  */
#define I386_DR_SET_RW_LEN(i,rwlen) \
#define I386_DR_SET_RW_LEN(i,rwlen) \
  do { \
  do { \
    dr_control_mirror &= ~(0x0f << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i)));   \
    dr_control_mirror &= ~(0x0f << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i)));   \
    dr_control_mirror |= ((rwlen) << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i))); \
    dr_control_mirror |= ((rwlen) << (DR_CONTROL_SHIFT+DR_CONTROL_SIZE*(i))); \
  } while (0)
  } while (0)
 
 
/* Get from DR7 the RW and LEN fields for the I'th debug register.  */
/* Get from DR7 the RW and LEN fields for the I'th debug register.  */
#define I386_DR_GET_RW_LEN(i) \
#define I386_DR_GET_RW_LEN(i) \
  ((dr_control_mirror >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))) & 0x0f)
  ((dr_control_mirror >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))) & 0x0f)
 
 
/* Mask that this I'th watchpoint has triggered.  */
/* Mask that this I'th watchpoint has triggered.  */
#define I386_DR_WATCH_MASK(i)   (1 << (i))
#define I386_DR_WATCH_MASK(i)   (1 << (i))
 
 
/* Did the watchpoint whose address is in the I'th register break?  */
/* Did the watchpoint whose address is in the I'th register break?  */
#define I386_DR_WATCH_HIT(i)    (dr_status_mirror & I386_DR_WATCH_MASK (i))
#define I386_DR_WATCH_HIT(i)    (dr_status_mirror & I386_DR_WATCH_MASK (i))
 
 
/* A macro to loop over all debug registers.  */
/* A macro to loop over all debug registers.  */
#define ALL_DEBUG_REGISTERS(i)  for (i = 0; i < DR_NADDR; i++)
#define ALL_DEBUG_REGISTERS(i)  for (i = 0; i < DR_NADDR; i++)
 
 
/* Mirror the inferior's DRi registers.  We keep the status and
/* Mirror the inferior's DRi registers.  We keep the status and
   control registers separated because they don't hold addresses.  */
   control registers separated because they don't hold addresses.  */
static CORE_ADDR dr_mirror[DR_NADDR];
static CORE_ADDR dr_mirror[DR_NADDR];
static unsigned long dr_status_mirror, dr_control_mirror;
static unsigned long dr_status_mirror, dr_control_mirror;
 
 
/* Reference counts for each debug register.  */
/* Reference counts for each debug register.  */
static int dr_ref_count[DR_NADDR];
static int dr_ref_count[DR_NADDR];
 
 
/* Whether or not to print the mirrored debug registers.  */
/* Whether or not to print the mirrored debug registers.  */
static int maint_show_dr;
static int maint_show_dr;
 
 
/* Types of operations supported by i386_handle_nonaligned_watchpoint.  */
/* Types of operations supported by i386_handle_nonaligned_watchpoint.  */
typedef enum { WP_INSERT, WP_REMOVE, WP_COUNT } i386_wp_op_t;
typedef enum { WP_INSERT, WP_REMOVE, WP_COUNT } i386_wp_op_t;
 
 
/* Internal functions.  */
/* Internal functions.  */
 
 
/* Return the value of a 4-bit field for DR7 suitable for watching a
/* Return the value of a 4-bit field for DR7 suitable for watching a
   region of LEN bytes for accesses of type TYPE.  LEN is assumed to
   region of LEN bytes for accesses of type TYPE.  LEN is assumed to
   have the value of 1, 2, or 4.  */
   have the value of 1, 2, or 4.  */
static unsigned i386_length_and_rw_bits (int len, enum target_hw_bp_type type);
static unsigned i386_length_and_rw_bits (int len, enum target_hw_bp_type type);
 
 
/* Insert a watchpoint at address ADDR, which is assumed to be aligned
/* Insert a watchpoint at address ADDR, which is assumed to be aligned
   according to the length of the region to watch.  LEN_RW_BITS is the
   according to the length of the region to watch.  LEN_RW_BITS is the
   value of the bit-field from DR7 which describes the length and
   value of the bit-field from DR7 which describes the length and
   access type of the region to be watched by this watchpoint.  Return
   access type of the region to be watched by this watchpoint.  Return
   0 on success, -1 on failure.  */
   0 on success, -1 on failure.  */
static int i386_insert_aligned_watchpoint (CORE_ADDR addr,
static int i386_insert_aligned_watchpoint (CORE_ADDR addr,
                                           unsigned len_rw_bits);
                                           unsigned len_rw_bits);
 
 
/* Remove a watchpoint at address ADDR, which is assumed to be aligned
/* Remove a watchpoint at address ADDR, which is assumed to be aligned
   according to the length of the region to watch.  LEN_RW_BITS is the
   according to the length of the region to watch.  LEN_RW_BITS is the
   value of the bits from DR7 which describes the length and access
   value of the bits from DR7 which describes the length and access
   type of the region watched by this watchpoint.  Return 0 on
   type of the region watched by this watchpoint.  Return 0 on
   success, -1 on failure.  */
   success, -1 on failure.  */
static int i386_remove_aligned_watchpoint (CORE_ADDR addr,
static int i386_remove_aligned_watchpoint (CORE_ADDR addr,
                                           unsigned len_rw_bits);
                                           unsigned len_rw_bits);
 
 
/* Insert or remove a (possibly non-aligned) watchpoint, or count the
/* Insert or remove a (possibly non-aligned) watchpoint, or count the
   number of debug registers required to watch a region at address
   number of debug registers required to watch a region at address
   ADDR whose length is LEN for accesses of type TYPE.  Return 0 on
   ADDR whose length is LEN for accesses of type TYPE.  Return 0 on
   successful insertion or removal, a positive number when queried
   successful insertion or removal, a positive number when queried
   about the number of registers, or -1 on failure.  If WHAT is not a
   about the number of registers, or -1 on failure.  If WHAT is not a
   valid value, bombs through internal_error.  */
   valid value, bombs through internal_error.  */
static int i386_handle_nonaligned_watchpoint (i386_wp_op_t what,
static int i386_handle_nonaligned_watchpoint (i386_wp_op_t what,
                                              CORE_ADDR addr, int len,
                                              CORE_ADDR addr, int len,
                                              enum target_hw_bp_type type);
                                              enum target_hw_bp_type type);
 
 
/* Implementation.  */
/* Implementation.  */
 
 
/* Clear the reference counts and forget everything we knew about the
/* Clear the reference counts and forget everything we knew about the
   debug registers.  */
   debug registers.  */
 
 
void
void
i386_cleanup_dregs (void)
i386_cleanup_dregs (void)
{
{
  int i;
  int i;
 
 
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      dr_mirror[i] = 0;
      dr_mirror[i] = 0;
      dr_ref_count[i] = 0;
      dr_ref_count[i] = 0;
    }
    }
  dr_control_mirror = 0;
  dr_control_mirror = 0;
  dr_status_mirror  = 0;
  dr_status_mirror  = 0;
}
}
 
 
/* Print the values of the mirrored debug registers.  This is called
/* Print the values of the mirrored debug registers.  This is called
   when maint_show_dr is non-zero.  To set that up, type "maint
   when maint_show_dr is non-zero.  To set that up, type "maint
   show-debug-regs" at GDB's prompt.  */
   show-debug-regs" at GDB's prompt.  */
 
 
static void
static void
i386_show_dr (const char *func, CORE_ADDR addr,
i386_show_dr (const char *func, CORE_ADDR addr,
              int len, enum target_hw_bp_type type)
              int len, enum target_hw_bp_type type)
{
{
  int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
  int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
  int i;
  int i;
 
 
  puts_unfiltered (func);
  puts_unfiltered (func);
  if (addr || len)
  if (addr || len)
    printf_unfiltered (" (addr=%lx, len=%d, type=%s)",
    printf_unfiltered (" (addr=%lx, len=%d, type=%s)",
                       /* This code is for ia32, so casting CORE_ADDR
                       /* This code is for ia32, so casting CORE_ADDR
                          to unsigned long should be okay.  */
                          to unsigned long should be okay.  */
                       (unsigned long)addr, len,
                       (unsigned long)addr, len,
                       type == hw_write ? "data-write"
                       type == hw_write ? "data-write"
                       : (type == hw_read ? "data-read"
                       : (type == hw_read ? "data-read"
                          : (type == hw_access ? "data-read/write"
                          : (type == hw_access ? "data-read/write"
                             : (type == hw_execute ? "instruction-execute"
                             : (type == hw_execute ? "instruction-execute"
                                /* FIXME: if/when I/O read/write
                                /* FIXME: if/when I/O read/write
                                   watchpoints are supported, add them
                                   watchpoints are supported, add them
                                   here.  */
                                   here.  */
                                : "??unknown??"))));
                                : "??unknown??"))));
  puts_unfiltered (":\n");
  puts_unfiltered (":\n");
  printf_unfiltered ("\tCONTROL (DR7): %s          STATUS (DR6): %s\n",
  printf_unfiltered ("\tCONTROL (DR7): %s          STATUS (DR6): %s\n",
                     phex (dr_control_mirror, 8), phex (dr_status_mirror, 8));
                     phex (dr_control_mirror, 8), phex (dr_status_mirror, 8));
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      printf_unfiltered ("\
      printf_unfiltered ("\
\tDR%d: addr=0x%s, ref.count=%d  DR%d: addr=0x%s, ref.count=%d\n",
\tDR%d: addr=0x%s, ref.count=%d  DR%d: addr=0x%s, ref.count=%d\n",
                 i, phex (dr_mirror[i], addr_size), dr_ref_count[i],
                 i, phex (dr_mirror[i], addr_size), dr_ref_count[i],
                 i+1, phex (dr_mirror[i+1], addr_size), dr_ref_count[i+1]);
                 i+1, phex (dr_mirror[i+1], addr_size), dr_ref_count[i+1]);
      i++;
      i++;
    }
    }
}
}
 
 
/* Return the value of a 4-bit field for DR7 suitable for watching a
/* Return the value of a 4-bit field for DR7 suitable for watching a
   region of LEN bytes for accesses of type TYPE.  LEN is assumed to
   region of LEN bytes for accesses of type TYPE.  LEN is assumed to
   have the value of 1, 2, or 4.  */
   have the value of 1, 2, or 4.  */
 
 
static unsigned
static unsigned
i386_length_and_rw_bits (int len, enum target_hw_bp_type type)
i386_length_and_rw_bits (int len, enum target_hw_bp_type type)
{
{
  unsigned rw;
  unsigned rw;
 
 
  switch (type)
  switch (type)
    {
    {
      case hw_execute:
      case hw_execute:
        rw = DR_RW_EXECUTE;
        rw = DR_RW_EXECUTE;
        break;
        break;
      case hw_write:
      case hw_write:
        rw = DR_RW_WRITE;
        rw = DR_RW_WRITE;
        break;
        break;
      case hw_read:
      case hw_read:
        /* The i386 doesn't support data-read watchpoints.  */
        /* The i386 doesn't support data-read watchpoints.  */
      case hw_access:
      case hw_access:
        rw = DR_RW_READ;
        rw = DR_RW_READ;
        break;
        break;
#if 0
#if 0
        /* Not yet supported.  */
        /* Not yet supported.  */
      case hw_io_access:
      case hw_io_access:
        rw = DR_RW_IORW;
        rw = DR_RW_IORW;
        break;
        break;
#endif
#endif
      default:
      default:
        internal_error (__FILE__, __LINE__, _("\
        internal_error (__FILE__, __LINE__, _("\
Invalid hardware breakpoint type %d in i386_length_and_rw_bits.\n"),
Invalid hardware breakpoint type %d in i386_length_and_rw_bits.\n"),
                        (int) type);
                        (int) type);
    }
    }
 
 
  switch (len)
  switch (len)
    {
    {
      case 1:
      case 1:
        return (DR_LEN_1 | rw);
        return (DR_LEN_1 | rw);
      case 2:
      case 2:
        return (DR_LEN_2 | rw);
        return (DR_LEN_2 | rw);
      case 4:
      case 4:
        return (DR_LEN_4 | rw);
        return (DR_LEN_4 | rw);
      case 8:
      case 8:
        if (TARGET_HAS_DR_LEN_8)
        if (TARGET_HAS_DR_LEN_8)
          return (DR_LEN_8 | rw);
          return (DR_LEN_8 | rw);
      default:
      default:
        internal_error (__FILE__, __LINE__, _("\
        internal_error (__FILE__, __LINE__, _("\
Invalid hardware breakpoint length %d in i386_length_and_rw_bits.\n"), len);
Invalid hardware breakpoint length %d in i386_length_and_rw_bits.\n"), len);
    }
    }
}
}
 
 
/* Insert a watchpoint at address ADDR, which is assumed to be aligned
/* Insert a watchpoint at address ADDR, which is assumed to be aligned
   according to the length of the region to watch.  LEN_RW_BITS is the
   according to the length of the region to watch.  LEN_RW_BITS is the
   value of the bits from DR7 which describes the length and access
   value of the bits from DR7 which describes the length and access
   type of the region to be watched by this watchpoint.  Return 0 on
   type of the region to be watched by this watchpoint.  Return 0 on
   success, -1 on failure.  */
   success, -1 on failure.  */
 
 
static int
static int
i386_insert_aligned_watchpoint (CORE_ADDR addr, unsigned len_rw_bits)
i386_insert_aligned_watchpoint (CORE_ADDR addr, unsigned len_rw_bits)
{
{
  int i;
  int i;
 
 
  if (!i386_dr_low.set_addr || !i386_dr_low.set_control)
  if (!i386_dr_low.set_addr || !i386_dr_low.set_control)
    return -1;
    return -1;
 
 
  /* First, look for an occupied debug register with the same address
  /* First, look for an occupied debug register with the same address
     and the same RW and LEN definitions.  If we find one, we can
     and the same RW and LEN definitions.  If we find one, we can
     reuse it for this watchpoint as well (and save a register).  */
     reuse it for this watchpoint as well (and save a register).  */
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      if (!I386_DR_VACANT (i)
      if (!I386_DR_VACANT (i)
          && dr_mirror[i] == addr
          && dr_mirror[i] == addr
          && I386_DR_GET_RW_LEN (i) == len_rw_bits)
          && I386_DR_GET_RW_LEN (i) == len_rw_bits)
        {
        {
          dr_ref_count[i]++;
          dr_ref_count[i]++;
          return 0;
          return 0;
        }
        }
    }
    }
 
 
  /* Next, look for a vacant debug register.  */
  /* Next, look for a vacant debug register.  */
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      if (I386_DR_VACANT (i))
      if (I386_DR_VACANT (i))
        break;
        break;
    }
    }
 
 
  /* No more debug registers!  */
  /* No more debug registers!  */
  if (i >= DR_NADDR)
  if (i >= DR_NADDR)
    return -1;
    return -1;
 
 
  /* Now set up the register I to watch our region.  */
  /* Now set up the register I to watch our region.  */
 
 
  /* Record the info in our local mirrored array.  */
  /* Record the info in our local mirrored array.  */
  dr_mirror[i] = addr;
  dr_mirror[i] = addr;
  dr_ref_count[i] = 1;
  dr_ref_count[i] = 1;
  I386_DR_SET_RW_LEN (i, len_rw_bits);
  I386_DR_SET_RW_LEN (i, len_rw_bits);
  /* Note: we only enable the watchpoint locally, i.e. in the current
  /* Note: we only enable the watchpoint locally, i.e. in the current
     task.  Currently, no i386 target allows or supports global
     task.  Currently, no i386 target allows or supports global
     watchpoints; however, if any target would want that in the
     watchpoints; however, if any target would want that in the
     future, GDB should probably provide a command to control whether
     future, GDB should probably provide a command to control whether
     to enable watchpoints globally or locally, and the code below
     to enable watchpoints globally or locally, and the code below
     should use global or local enable and slow-down flags as
     should use global or local enable and slow-down flags as
     appropriate.  */
     appropriate.  */
  I386_DR_LOCAL_ENABLE (i);
  I386_DR_LOCAL_ENABLE (i);
  dr_control_mirror |= DR_LOCAL_SLOWDOWN;
  dr_control_mirror |= DR_LOCAL_SLOWDOWN;
  dr_control_mirror &= I386_DR_CONTROL_MASK;
  dr_control_mirror &= I386_DR_CONTROL_MASK;
 
 
  /* Finally, actually pass the info to the inferior.  */
  /* Finally, actually pass the info to the inferior.  */
  i386_dr_low.set_addr (i, addr);
  i386_dr_low.set_addr (i, addr);
  i386_dr_low.set_control (dr_control_mirror);
  i386_dr_low.set_control (dr_control_mirror);
 
 
  /* Only a sanity check for leftover bits (set possibly only by inferior).  */
  /* Only a sanity check for leftover bits (set possibly only by inferior).  */
  if (i386_dr_low.unset_status)
  if (i386_dr_low.unset_status)
    i386_dr_low.unset_status (I386_DR_WATCH_MASK (i));
    i386_dr_low.unset_status (I386_DR_WATCH_MASK (i));
 
 
  return 0;
  return 0;
}
}
 
 
/* Remove a watchpoint at address ADDR, which is assumed to be aligned
/* Remove a watchpoint at address ADDR, which is assumed to be aligned
   according to the length of the region to watch.  LEN_RW_BITS is the
   according to the length of the region to watch.  LEN_RW_BITS is the
   value of the bits from DR7 which describes the length and access
   value of the bits from DR7 which describes the length and access
   type of the region watched by this watchpoint.  Return 0 on
   type of the region watched by this watchpoint.  Return 0 on
   success, -1 on failure.  */
   success, -1 on failure.  */
 
 
static int
static int
i386_remove_aligned_watchpoint (CORE_ADDR addr, unsigned len_rw_bits)
i386_remove_aligned_watchpoint (CORE_ADDR addr, unsigned len_rw_bits)
{
{
  int i, retval = -1;
  int i, retval = -1;
 
 
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      if (!I386_DR_VACANT (i)
      if (!I386_DR_VACANT (i)
          && dr_mirror[i] == addr
          && dr_mirror[i] == addr
          && I386_DR_GET_RW_LEN (i) == len_rw_bits)
          && I386_DR_GET_RW_LEN (i) == len_rw_bits)
        {
        {
          if (--dr_ref_count[i] == 0) /* no longer in use? */
          if (--dr_ref_count[i] == 0) /* no longer in use? */
            {
            {
              /* Reset our mirror.  */
              /* Reset our mirror.  */
              dr_mirror[i] = 0;
              dr_mirror[i] = 0;
              I386_DR_DISABLE (i);
              I386_DR_DISABLE (i);
              /* Reset it in the inferior.  */
              /* Reset it in the inferior.  */
              i386_dr_low.set_control (dr_control_mirror);
              i386_dr_low.set_control (dr_control_mirror);
              if (i386_dr_low.reset_addr)
              if (i386_dr_low.reset_addr)
                i386_dr_low.reset_addr (i);
                i386_dr_low.reset_addr (i);
            }
            }
          retval = 0;
          retval = 0;
        }
        }
    }
    }
 
 
  return retval;
  return retval;
}
}
 
 
/* Insert or remove a (possibly non-aligned) watchpoint, or count the
/* Insert or remove a (possibly non-aligned) watchpoint, or count the
   number of debug registers required to watch a region at address
   number of debug registers required to watch a region at address
   ADDR whose length is LEN for accesses of type TYPE.  Return 0 on
   ADDR whose length is LEN for accesses of type TYPE.  Return 0 on
   successful insertion or removal, a positive number when queried
   successful insertion or removal, a positive number when queried
   about the number of registers, or -1 on failure.  If WHAT is not a
   about the number of registers, or -1 on failure.  If WHAT is not a
   valid value, bombs through internal_error.  */
   valid value, bombs through internal_error.  */
 
 
static int
static int
i386_handle_nonaligned_watchpoint (i386_wp_op_t what, CORE_ADDR addr, int len,
i386_handle_nonaligned_watchpoint (i386_wp_op_t what, CORE_ADDR addr, int len,
                                   enum target_hw_bp_type type)
                                   enum target_hw_bp_type type)
{
{
  int retval = 0, status = 0;
  int retval = 0, status = 0;
  int max_wp_len = TARGET_HAS_DR_LEN_8 ? 8 : 4;
  int max_wp_len = TARGET_HAS_DR_LEN_8 ? 8 : 4;
 
 
  static int size_try_array[8][8] =
  static int size_try_array[8][8] =
  {
  {
    {1, 1, 1, 1, 1, 1, 1, 1},   /* Trying size one.  */
    {1, 1, 1, 1, 1, 1, 1, 1},   /* Trying size one.  */
    {2, 1, 2, 1, 2, 1, 2, 1},   /* Trying size two.  */
    {2, 1, 2, 1, 2, 1, 2, 1},   /* Trying size two.  */
    {2, 1, 2, 1, 2, 1, 2, 1},   /* Trying size three.  */
    {2, 1, 2, 1, 2, 1, 2, 1},   /* Trying size three.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size four.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size four.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size five.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size five.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size six.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size six.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size seven.  */
    {4, 1, 2, 1, 4, 1, 2, 1},   /* Trying size seven.  */
    {8, 1, 2, 1, 4, 1, 2, 1},   /* Trying size eight.  */
    {8, 1, 2, 1, 4, 1, 2, 1},   /* Trying size eight.  */
  };
  };
 
 
  while (len > 0)
  while (len > 0)
    {
    {
      int align = addr % max_wp_len;
      int align = addr % max_wp_len;
      /* Four (eight on AMD64) is the maximum length a debug register
      /* Four (eight on AMD64) is the maximum length a debug register
         can watch.  */
         can watch.  */
      int try = (len > max_wp_len ? (max_wp_len - 1) : len - 1);
      int try = (len > max_wp_len ? (max_wp_len - 1) : len - 1);
      int size = size_try_array[try][align];
      int size = size_try_array[try][align];
 
 
      if (what == WP_COUNT)
      if (what == WP_COUNT)
        {
        {
          /* size_try_array[] is defined such that each iteration
          /* size_try_array[] is defined such that each iteration
             through the loop is guaranteed to produce an address and a
             through the loop is guaranteed to produce an address and a
             size that can be watched with a single debug register.
             size that can be watched with a single debug register.
             Thus, for counting the registers required to watch a
             Thus, for counting the registers required to watch a
             region, we simply need to increment the count on each
             region, we simply need to increment the count on each
             iteration.  */
             iteration.  */
          retval++;
          retval++;
        }
        }
      else
      else
        {
        {
          unsigned len_rw = i386_length_and_rw_bits (size, type);
          unsigned len_rw = i386_length_and_rw_bits (size, type);
 
 
          if (what == WP_INSERT)
          if (what == WP_INSERT)
            status = i386_insert_aligned_watchpoint (addr, len_rw);
            status = i386_insert_aligned_watchpoint (addr, len_rw);
          else if (what == WP_REMOVE)
          else if (what == WP_REMOVE)
            status = i386_remove_aligned_watchpoint (addr, len_rw);
            status = i386_remove_aligned_watchpoint (addr, len_rw);
          else
          else
            internal_error (__FILE__, __LINE__, _("\
            internal_error (__FILE__, __LINE__, _("\
Invalid value %d of operation in i386_handle_nonaligned_watchpoint.\n"),
Invalid value %d of operation in i386_handle_nonaligned_watchpoint.\n"),
                            (int)what);
                            (int)what);
          /* We keep the loop going even after a failure, because some
          /* We keep the loop going even after a failure, because some
             of the other aligned watchpoints might still succeed
             of the other aligned watchpoints might still succeed
             (e.g. if they watch addresses that are already watched,
             (e.g. if they watch addresses that are already watched,
             in which case we just increment the reference counts of
             in which case we just increment the reference counts of
             occupied debug registers).  If we break out of the loop
             occupied debug registers).  If we break out of the loop
             too early, we could cause those addresses watched by
             too early, we could cause those addresses watched by
             other watchpoints to be disabled when breakpoint.c reacts
             other watchpoints to be disabled when breakpoint.c reacts
             to our failure to insert this watchpoint and tries to
             to our failure to insert this watchpoint and tries to
             remove it.  */
             remove it.  */
          if (status)
          if (status)
            retval = status;
            retval = status;
        }
        }
 
 
      addr += size;
      addr += size;
      len -= size;
      len -= size;
    }
    }
 
 
  return retval;
  return retval;
}
}
 
 
/* Insert a watchpoint to watch a memory region which starts at
/* Insert a watchpoint to watch a memory region which starts at
   address ADDR and whose length is LEN bytes.  Watch memory accesses
   address ADDR and whose length is LEN bytes.  Watch memory accesses
   of the type TYPE.  Return 0 on success, -1 on failure.  */
   of the type TYPE.  Return 0 on success, -1 on failure.  */
 
 
static int
static int
i386_insert_watchpoint (CORE_ADDR addr, int len, int type)
i386_insert_watchpoint (CORE_ADDR addr, int len, int type)
{
{
  int retval;
  int retval;
 
 
  if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
  if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
      || addr % len != 0)
      || addr % len != 0)
    retval = i386_handle_nonaligned_watchpoint (WP_INSERT, addr, len, type);
    retval = i386_handle_nonaligned_watchpoint (WP_INSERT, addr, len, type);
  else
  else
    {
    {
      unsigned len_rw = i386_length_and_rw_bits (len, type);
      unsigned len_rw = i386_length_and_rw_bits (len, type);
 
 
      retval = i386_insert_aligned_watchpoint (addr, len_rw);
      retval = i386_insert_aligned_watchpoint (addr, len_rw);
    }
    }
 
 
  if (maint_show_dr)
  if (maint_show_dr)
    i386_show_dr ("insert_watchpoint", addr, len, type);
    i386_show_dr ("insert_watchpoint", addr, len, type);
 
 
  return retval;
  return retval;
}
}
 
 
/* Remove a watchpoint that watched the memory region which starts at
/* Remove a watchpoint that watched the memory region which starts at
   address ADDR, whose length is LEN bytes, and for accesses of the
   address ADDR, whose length is LEN bytes, and for accesses of the
   type TYPE.  Return 0 on success, -1 on failure.  */
   type TYPE.  Return 0 on success, -1 on failure.  */
static int
static int
i386_remove_watchpoint (CORE_ADDR addr, int len, int type)
i386_remove_watchpoint (CORE_ADDR addr, int len, int type)
{
{
  int retval;
  int retval;
 
 
  if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
  if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
      || addr % len != 0)
      || addr % len != 0)
    retval = i386_handle_nonaligned_watchpoint (WP_REMOVE, addr, len, type);
    retval = i386_handle_nonaligned_watchpoint (WP_REMOVE, addr, len, type);
  else
  else
    {
    {
      unsigned len_rw = i386_length_and_rw_bits (len, type);
      unsigned len_rw = i386_length_and_rw_bits (len, type);
 
 
      retval = i386_remove_aligned_watchpoint (addr, len_rw);
      retval = i386_remove_aligned_watchpoint (addr, len_rw);
    }
    }
 
 
  if (maint_show_dr)
  if (maint_show_dr)
    i386_show_dr ("remove_watchpoint", addr, len, type);
    i386_show_dr ("remove_watchpoint", addr, len, type);
 
 
  return retval;
  return retval;
}
}
 
 
/* Return non-zero if we can watch a memory region that starts at
/* Return non-zero if we can watch a memory region that starts at
   address ADDR and whose length is LEN bytes.  */
   address ADDR and whose length is LEN bytes.  */
 
 
static int
static int
i386_region_ok_for_watchpoint (CORE_ADDR addr, int len)
i386_region_ok_for_watchpoint (CORE_ADDR addr, int len)
{
{
  int nregs;
  int nregs;
 
 
  /* Compute how many aligned watchpoints we would need to cover this
  /* Compute how many aligned watchpoints we would need to cover this
     region.  */
     region.  */
  nregs = i386_handle_nonaligned_watchpoint (WP_COUNT, addr, len, hw_write);
  nregs = i386_handle_nonaligned_watchpoint (WP_COUNT, addr, len, hw_write);
  return nregs <= DR_NADDR ? 1 : 0;
  return nregs <= DR_NADDR ? 1 : 0;
}
}
 
 
/* If the inferior has some watchpoint that triggered, set the
/* If the inferior has some watchpoint that triggered, set the
   address associated with that watchpoint and return non-zero.
   address associated with that watchpoint and return non-zero.
   Otherwise, return zero.  */
   Otherwise, return zero.  */
 
 
static int
static int
i386_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
i386_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
{
{
  CORE_ADDR addr = 0;
  CORE_ADDR addr = 0;
  int i;
  int i;
  int rc = 0;
  int rc = 0;
 
 
  dr_status_mirror = i386_dr_low.get_status ();
  dr_status_mirror = i386_dr_low.get_status ();
 
 
  ALL_DEBUG_REGISTERS(i)
  ALL_DEBUG_REGISTERS(i)
    {
    {
      if (I386_DR_WATCH_HIT (i)
      if (I386_DR_WATCH_HIT (i)
          /* This second condition makes sure DRi is set up for a data
          /* This second condition makes sure DRi is set up for a data
             watchpoint, not a hardware breakpoint.  The reason is
             watchpoint, not a hardware breakpoint.  The reason is
             that GDB doesn't call the target_stopped_data_address
             that GDB doesn't call the target_stopped_data_address
             method except for data watchpoints.  In other words, I'm
             method except for data watchpoints.  In other words, I'm
             being paranoiac.  */
             being paranoiac.  */
          && I386_DR_GET_RW_LEN (i) != 0
          && I386_DR_GET_RW_LEN (i) != 0
          /* This third condition makes sure DRi is not vacant, this
          /* This third condition makes sure DRi is not vacant, this
             avoids false positives in windows-nat.c.  */
             avoids false positives in windows-nat.c.  */
          && !I386_DR_VACANT (i))
          && !I386_DR_VACANT (i))
        {
        {
          addr = dr_mirror[i];
          addr = dr_mirror[i];
          rc = 1;
          rc = 1;
          if (maint_show_dr)
          if (maint_show_dr)
            i386_show_dr ("watchpoint_hit", addr, -1, hw_write);
            i386_show_dr ("watchpoint_hit", addr, -1, hw_write);
        }
        }
    }
    }
  if (maint_show_dr && addr == 0)
  if (maint_show_dr && addr == 0)
    i386_show_dr ("stopped_data_addr", 0, 0, hw_write);
    i386_show_dr ("stopped_data_addr", 0, 0, hw_write);
 
 
  if (rc)
  if (rc)
    *addr_p = addr;
    *addr_p = addr;
  return rc;
  return rc;
}
}
 
 
static int
static int
i386_stopped_by_watchpoint (void)
i386_stopped_by_watchpoint (void)
{
{
  CORE_ADDR addr = 0;
  CORE_ADDR addr = 0;
  return i386_stopped_data_address (&current_target, &addr);
  return i386_stopped_data_address (&current_target, &addr);
}
}
 
 
/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
   Return 0 on success, EBUSY on failure.  */
   Return 0 on success, EBUSY on failure.  */
static int
static int
i386_insert_hw_breakpoint (struct gdbarch *gdbarch,
i386_insert_hw_breakpoint (struct gdbarch *gdbarch,
                           struct bp_target_info *bp_tgt)
                           struct bp_target_info *bp_tgt)
{
{
  unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
  unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
  CORE_ADDR addr = bp_tgt->placed_address;
  CORE_ADDR addr = bp_tgt->placed_address;
  int retval = i386_insert_aligned_watchpoint (addr, len_rw) ? EBUSY : 0;
  int retval = i386_insert_aligned_watchpoint (addr, len_rw) ? EBUSY : 0;
 
 
  if (maint_show_dr)
  if (maint_show_dr)
    i386_show_dr ("insert_hwbp", addr, 1, hw_execute);
    i386_show_dr ("insert_hwbp", addr, 1, hw_execute);
 
 
  return retval;
  return retval;
}
}
 
 
/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
   Return 0 on success, -1 on failure.  */
   Return 0 on success, -1 on failure.  */
 
 
static int
static int
i386_remove_hw_breakpoint (struct gdbarch *gdbarch,
i386_remove_hw_breakpoint (struct gdbarch *gdbarch,
                           struct bp_target_info *bp_tgt)
                           struct bp_target_info *bp_tgt)
{
{
  unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
  unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
  CORE_ADDR addr = bp_tgt->placed_address;
  CORE_ADDR addr = bp_tgt->placed_address;
  int retval = i386_remove_aligned_watchpoint (addr, len_rw);
  int retval = i386_remove_aligned_watchpoint (addr, len_rw);
 
 
  if (maint_show_dr)
  if (maint_show_dr)
    i386_show_dr ("remove_hwbp", addr, 1, hw_execute);
    i386_show_dr ("remove_hwbp", addr, 1, hw_execute);
 
 
  return retval;
  return retval;
}
}
 
 
/* Returns the number of hardware watchpoints of type TYPE that we can
/* Returns the number of hardware watchpoints of type TYPE that we can
   set.  Value is positive if we can set CNT watchpoints, zero if
   set.  Value is positive if we can set CNT watchpoints, zero if
   setting watchpoints of type TYPE is not supported, and negative if
   setting watchpoints of type TYPE is not supported, and negative if
   CNT is more than the maximum number of watchpoints of type TYPE
   CNT is more than the maximum number of watchpoints of type TYPE
   that we can support.  TYPE is one of bp_hardware_watchpoint,
   that we can support.  TYPE is one of bp_hardware_watchpoint,
   bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint.
   bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint.
   CNT is the number of such watchpoints used so far (including this
   CNT is the number of such watchpoints used so far (including this
   one).  OTHERTYPE is non-zero if other types of watchpoints are
   one).  OTHERTYPE is non-zero if other types of watchpoints are
   currently enabled.
   currently enabled.
 
 
   We always return 1 here because we don't have enough information
   We always return 1 here because we don't have enough information
   about possible overlap of addresses that they want to watch.  As an
   about possible overlap of addresses that they want to watch.  As an
   extreme example, consider the case where all the watchpoints watch
   extreme example, consider the case where all the watchpoints watch
   the same address and the same region length: then we can handle a
   the same address and the same region length: then we can handle a
   virtually unlimited number of watchpoints, due to debug register
   virtually unlimited number of watchpoints, due to debug register
   sharing implemented via reference counts in i386-nat.c.  */
   sharing implemented via reference counts in i386-nat.c.  */
 
 
static int
static int
i386_can_use_hw_breakpoint (int type, int cnt, int othertype)
i386_can_use_hw_breakpoint (int type, int cnt, int othertype)
{
{
  return 1;
  return 1;
}
}
 
 
static void
static void
add_show_debug_regs_command (void)
add_show_debug_regs_command (void)
{
{
  /* A maintenance command to enable printing the internal DRi mirror
  /* A maintenance command to enable printing the internal DRi mirror
     variables.  */
     variables.  */
  add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
  add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
                           &maint_show_dr, _("\
                           &maint_show_dr, _("\
Set whether to show variables that mirror the x86 debug registers."), _("\
Set whether to show variables that mirror the x86 debug registers."), _("\
Show whether to show variables that mirror the x86 debug registers."), _("\
Show whether to show variables that mirror the x86 debug registers."), _("\
Use \"on\" to enable, \"off\" to disable.\n\
Use \"on\" to enable, \"off\" to disable.\n\
If enabled, the debug registers values are shown when GDB inserts\n\
If enabled, the debug registers values are shown when GDB inserts\n\
or removes a hardware breakpoint or watchpoint, and when the inferior\n\
or removes a hardware breakpoint or watchpoint, and when the inferior\n\
triggers a breakpoint or watchpoint."),
triggers a breakpoint or watchpoint."),
                           NULL,
                           NULL,
                           NULL,
                           NULL,
                           &maintenance_set_cmdlist,
                           &maintenance_set_cmdlist,
                           &maintenance_show_cmdlist);
                           &maintenance_show_cmdlist);
}
}
 
 
/* There are only two global functions left.  */
/* There are only two global functions left.  */
 
 
void
void
i386_use_watchpoints (struct target_ops *t)
i386_use_watchpoints (struct target_ops *t)
{
{
  /* After a watchpoint trap, the PC points to the instruction after the
  /* After a watchpoint trap, the PC points to the instruction after the
     one that caused the trap.  Therefore we don't need to step over it.
     one that caused the trap.  Therefore we don't need to step over it.
     But we do need to reset the status register to avoid another trap.  */
     But we do need to reset the status register to avoid another trap.  */
  t->to_have_continuable_watchpoint = 1;
  t->to_have_continuable_watchpoint = 1;
 
 
  t->to_can_use_hw_breakpoint = i386_can_use_hw_breakpoint;
  t->to_can_use_hw_breakpoint = i386_can_use_hw_breakpoint;
  t->to_region_ok_for_hw_watchpoint = i386_region_ok_for_watchpoint;
  t->to_region_ok_for_hw_watchpoint = i386_region_ok_for_watchpoint;
  t->to_stopped_by_watchpoint = i386_stopped_by_watchpoint;
  t->to_stopped_by_watchpoint = i386_stopped_by_watchpoint;
  t->to_stopped_data_address = i386_stopped_data_address;
  t->to_stopped_data_address = i386_stopped_data_address;
  t->to_insert_watchpoint = i386_insert_watchpoint;
  t->to_insert_watchpoint = i386_insert_watchpoint;
  t->to_remove_watchpoint = i386_remove_watchpoint;
  t->to_remove_watchpoint = i386_remove_watchpoint;
  t->to_insert_hw_breakpoint = i386_insert_hw_breakpoint;
  t->to_insert_hw_breakpoint = i386_insert_hw_breakpoint;
  t->to_remove_hw_breakpoint = i386_remove_hw_breakpoint;
  t->to_remove_hw_breakpoint = i386_remove_hw_breakpoint;
}
}
 
 
void
void
i386_set_debug_register_length (int len)
i386_set_debug_register_length (int len)
{
{
  /* This function should be called only once for each native target.  */
  /* This function should be called only once for each native target.  */
  gdb_assert (i386_dr_low.debug_register_length == 0);
  gdb_assert (i386_dr_low.debug_register_length == 0);
  gdb_assert (len == 4 || len == 8);
  gdb_assert (len == 4 || len == 8);
  i386_dr_low.debug_register_length = len;
  i386_dr_low.debug_register_length = len;
  add_show_debug_regs_command ();
  add_show_debug_regs_command ();
}
}
 
 

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