gdb/config/i386/nm-i386.h

   1 /* Native macro definitions for GDB on an Intel i[3456]86.
   2    Copyright 2001, 2004, 2007, 2008 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef NM_I386_H
  20 #define NM_I386_H 1
  21
  22 /* Hardware-assisted breakpoints and watchpoints.  */
  23
  24 /* Targets should define this to use the generic x86 watchpoint support.  */
  25 #ifdef I386_USE_GENERIC_WATCHPOINTS
  26
  27 /* Clear the reference counts and forget everything we knew about DRi.  */
  28 extern void i386_cleanup_dregs (void);
  29
  30 /* Insert a watchpoint to watch a memory region which starts at
  31    address ADDR and whose length is LEN bytes.  Watch memory accesses
  32    of the type TYPE.  Return 0 on success, -1 on failure.  */
  33 extern int i386_insert_watchpoint (CORE_ADDR addr, int len, int type);
  34
  35 /* Remove a watchpoint that watched the memory region which starts at
  36    address ADDR, whose length is LEN bytes, and for accesses of the
  37    type TYPE.  Return 0 on success, -1 on failure.  */
  38 extern int i386_remove_watchpoint (CORE_ADDR addr, int len, int type);
  39
  40 /* Return non-zero if we can watch a memory region that starts at
  41    address ADDR and whose length is LEN bytes.  */
  42 extern int i386_region_ok_for_watchpoint (CORE_ADDR addr, int len);
  43
  44 /* Return non-zero if the inferior has some break/watchpoint that
  45    triggered.  */
  46 extern int i386_stopped_by_hwbp (void);
  47
  48 /* If the inferior has some break/watchpoint that triggered, set
  49    the address associated with that break/watchpoint and return
  50    true.  Otherwise, return false.  */
  51 extern int i386_stopped_data_address (CORE_ADDR *);
  52
  53 /* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
  54    Return 0 on success, EBUSY on failure.  */
  55 struct bp_target_info;
  56 extern int i386_insert_hw_breakpoint (struct bp_target_info *bp_tgt);
  57
  58 /* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
  59    Return 0 on success, -1 on failure.  */
  60 extern int  i386_remove_hw_breakpoint (struct bp_target_info *bp_tgt);
  61
  62 /* Returns the number of hardware watchpoints of type TYPE that we can
  63    set.  Value is positive if we can set CNT watchpoints, zero if
  64    setting watchpoints of type TYPE is not supported, and negative if
  65    CNT is more than the maximum number of watchpoints of type TYPE
  66    that we can support.  TYPE is one of bp_hardware_watchpoint,
  67    bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint.
  68    CNT is the number of such watchpoints used so far (including this
  69    one).  OTHERTYPE is non-zero if other types of watchpoints are
  70    currently enabled.
  71
  72    We always return 1 here because we don't have enough information
  73    about possible overlap of addresses that they want to watch.  As an
  74    extreme example, consider the case where all the watchpoints watch
  75    the same address and the same region length: then we can handle a
  76    virtually unlimited number of watchpoints, due to debug register
  77    sharing implemented via reference counts in i386-nat.c.  */
  78
  79 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(type, cnt, ot) 1
  80
  81 /* Returns non-zero if we can use hardware watchpoints to watch a
  82    region whose address is ADDR and whose length is LEN.  */
  83
  84 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
  85   i386_region_ok_for_watchpoint (addr, len)
  86
  87 /* After a watchpoint trap, the PC points to the instruction after the
  88    one that caused the trap.  Therefore we don't need to step over it.
  89    But we do need to reset the status register to avoid another trap.  */
  90
  91 #define HAVE_CONTINUABLE_WATCHPOINT 1
  92
  93 extern int i386_stopped_by_watchpoint (void);
  94
  95 #define STOPPED_BY_WATCHPOINT(W)       (i386_stopped_by_watchpoint () != 0)
  96
  97 #define target_stopped_data_address(target, x)  i386_stopped_data_address(x)
  98
  99 /* Use these macros for watchpoint insertion/removal.  */
 100
 101 #define target_insert_watchpoint(addr, len, type) \
 102   i386_insert_watchpoint (addr, len, type)
 103
 104 #define target_remove_watchpoint(addr, len, type) \
 105   i386_remove_watchpoint (addr, len, type)
 106
 107 #define target_insert_hw_breakpoint(bp_tgt) \
 108   i386_insert_hw_breakpoint (bp_tgt)
 109
 110 #define target_remove_hw_breakpoint(bp_tgt) \
 111   i386_remove_hw_breakpoint (bp_tgt)
 112
 113 #endif /* I386_USE_GENERIC_WATCHPOINTS */
 114
 115 #endif /* NM_I386_H */