1/* Native macro definitions for GDB on an Intel i[3456]86. 2 Copyright 2001, 2004, 2007 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. */ 28extern 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. */ 33extern 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. */ 38extern 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. */ 42extern 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. */ 46extern 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. */ 51extern 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. */ 55struct bp_target_info; 56extern 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. */ 60extern 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 93extern 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/* child_post_startup_inferior used to 114 reset all debug registers by calling i386_cleanup_dregs (). */ 115#define CHILD_POST_STARTUP_INFERIOR 116 117#endif /* I386_USE_GENERIC_WATCHPOINTS */ 118 119#endif /* NM_I386_H */ 120