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52b98211 | 1 | /* Native macro definitions for GDB on an Intel i[3456]86. |
e74f0f02 | 2 | Copyright 2001, 2004 Free Software Foundation, Inc. |
52b98211 EZ |
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 2 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, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #ifndef NM_I386_H | |
22 | #define NM_I386_H 1 | |
23 | ||
52b98211 EZ |
24 | /* Hardware-assisted breakpoints and watchpoints. */ |
25 | ||
26 | /* Targets should define this to use the generic x86 watchpoint support. */ | |
27 | #ifdef I386_USE_GENERIC_WATCHPOINTS | |
28 | ||
52b98211 EZ |
29 | #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS |
30 | #define TARGET_HAS_HARDWARE_WATCHPOINTS | |
31 | #endif | |
32 | ||
33 | /* Clear the reference counts and forget everything we knew about DRi. */ | |
34 | extern void i386_cleanup_dregs (void); | |
35 | ||
36 | /* Insert a watchpoint to watch a memory region which starts at | |
37 | address ADDR and whose length is LEN bytes. Watch memory accesses | |
38 | of the type TYPE. Return 0 on success, -1 on failure. */ | |
207e433e | 39 | extern int i386_insert_watchpoint (CORE_ADDR addr, int len, int type); |
52b98211 EZ |
40 | |
41 | /* Remove a watchpoint that watched the memory region which starts at | |
42 | address ADDR, whose length is LEN bytes, and for accesses of the | |
43 | type TYPE. Return 0 on success, -1 on failure. */ | |
207e433e | 44 | extern int i386_remove_watchpoint (CORE_ADDR addr, int len, int type); |
52b98211 EZ |
45 | |
46 | /* Return non-zero if we can watch a memory region that starts at | |
47 | address ADDR and whose length is LEN bytes. */ | |
207e433e | 48 | extern int i386_region_ok_for_watchpoint (CORE_ADDR addr, int len); |
52b98211 EZ |
49 | |
50 | /* Return non-zero if the inferior has some break/watchpoint that | |
51 | triggered. */ | |
207e433e | 52 | extern int i386_stopped_by_hwbp (void); |
52b98211 EZ |
53 | |
54 | /* If the inferior has some break/watchpoint that triggered, return | |
55 | the address associated with that break/watchpoint. Otherwise, | |
56 | return zero. */ | |
57 | extern CORE_ADDR i386_stopped_data_address (void); | |
58 | ||
59 | /* Insert a hardware-assisted breakpoint at address ADDR. SHADOW is | |
60 | unused. Return 0 on success, EBUSY on failure. */ | |
207e433e | 61 | extern int i386_insert_hw_breakpoint (CORE_ADDR addr, void *shadow); |
52b98211 EZ |
62 | |
63 | /* Remove a hardware-assisted breakpoint at address ADDR. SHADOW is | |
207e433e | 64 | unused. Return 0 on success, -1 on failure. */ |
52b98211 EZ |
65 | extern int i386_remove_hw_breakpoint (CORE_ADDR addr, void *shadow); |
66 | ||
67 | /* Returns the number of hardware watchpoints of type TYPE that we can | |
68 | set. Value is positive if we can set CNT watchpoints, zero if | |
69 | setting watchpoints of type TYPE is not supported, and negative if | |
70 | CNT is more than the maximum number of watchpoints of type TYPE | |
71 | that we can support. TYPE is one of bp_hardware_watchpoint, | |
72 | bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint. | |
73 | CNT is the number of such watchpoints used so far (including this | |
74 | one). OTHERTYPE is non-zero if other types of watchpoints are | |
75 | currently enabled. | |
76 | ||
77 | We always return 1 here because we don't have enough information | |
207e433e MK |
78 | about possible overlap of addresses that they want to watch. As an |
79 | extreme example, consider the case where all the watchpoints watch | |
80 | the same address and the same region length: then we can handle a | |
81 | virtually unlimited number of watchpoints, due to debug register | |
82 | sharing implemented via reference counts in i386-nat.c. */ | |
52b98211 EZ |
83 | |
84 | #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(type, cnt, ot) 1 | |
85 | ||
207e433e MK |
86 | /* Returns non-zero if we can use hardware watchpoints to watch a |
87 | region whose address is ADDR and whose length is LEN. */ | |
52b98211 | 88 | |
207e433e MK |
89 | #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \ |
90 | i386_region_ok_for_watchpoint (addr, len) | |
52b98211 EZ |
91 | |
92 | /* After a watchpoint trap, the PC points to the instruction after the | |
93 | one that caused the trap. Therefore we don't need to step over it. | |
94 | But we do need to reset the status register to avoid another trap. */ | |
95 | ||
7df1a324 | 96 | #define HAVE_CONTINUABLE_WATCHPOINT 1 |
52b98211 EZ |
97 | |
98 | #define STOPPED_BY_WATCHPOINT(W) (i386_stopped_data_address () != 0) | |
99 | ||
100 | #define target_stopped_data_address() i386_stopped_data_address () | |
101 | ||
102 | /* Use these macros for watchpoint insertion/removal. */ | |
103 | ||
207e433e | 104 | #define target_insert_watchpoint(addr, len, type) \ |
52b98211 EZ |
105 | i386_insert_watchpoint (addr, len, type) |
106 | ||
207e433e | 107 | #define target_remove_watchpoint(addr, len, type) \ |
52b98211 EZ |
108 | i386_remove_watchpoint (addr, len, type) |
109 | ||
207e433e MK |
110 | #define target_insert_hw_breakpoint(addr, shadow) \ |
111 | i386_insert_hw_breakpoint (addr, shadow) | |
52b98211 | 112 | |
207e433e MK |
113 | #define target_remove_hw_breakpoint(addr, shadow) \ |
114 | i386_remove_hw_breakpoint (addr, shadow) | |
52b98211 | 115 | |
9b4f1ba7 PM |
116 | /* child_post_startup_inferior used to |
117 | reset all debug registers by calling i386_cleanup_dregs (). */ | |
118 | #define CHILD_POST_STARTUP_INFERIOR | |
119 | ||
52b98211 EZ |
120 | #endif /* I386_USE_GENERIC_WATCHPOINTS */ |
121 | ||
122 | #endif /* NM_I386_H */ |