1 /* Intel 386 native support for System V systems (pre-SVR4).
3 Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
4 1999, 2000, 2002 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
28 #ifdef HAVE_SYS_PTRACE_H
29 #include <sys/ptrace.h>
38 #include <sys/param.h>
42 #include <sys/ioctl.h>
45 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
46 #include <sys/debugreg.h>
56 #include "floatformat.h"
60 #include "i386-tdep.h"
63 /* Mapping between the general-purpose registers in `struct user'
64 format and GDB's register array layout. */
73 /* Support for the user struct. */
75 /* Return the address of register REGNUM. BLOCKEND is the value of
76 u.u_ar0, and points to the place where GS is stored. */
79 register_u_addr (CORE_ADDR blockend
, int regnum
)
84 if (i386_fp_regnum_p (regnum
))
86 #ifdef KSTKSZ /* SCO, and others? */
87 blockend
+= 4 * (SS
+ 1) - KSTKSZ
;
88 fpstate
= blockend
+ ((char *) &u
.u_fps
.u_fpstate
- (char *) &u
);
89 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
91 fpstate
= blockend
+ ((char *) &u
.i387
.st_space
- (char *) &u
);
92 return (fpstate
+ 10 * (regnum
- FP0_REGNUM
));
96 return (blockend
+ 4 * regmap
[regnum
]);
99 /* Return the size of the user struct. */
104 return (sizeof (struct user
));
107 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
109 #if !defined (offsetof)
110 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
113 /* Record the value of the debug control register. */
114 static int debug_control_mirror
;
116 /* Record which address associates with which register. */
117 static CORE_ADDR address_lookup
[DR_LASTADDR
- DR_FIRSTADDR
+ 1];
119 static int i386_insert_aligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int,
122 static int i386_insert_nonaligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int,
125 /* Insert a watchpoint. */
128 i386_insert_watchpoint (int pid
, CORE_ADDR addr
, int len
, int rw
)
130 return i386_insert_aligned_watchpoint (pid
, addr
, addr
, len
, rw
);
134 i386_insert_aligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
138 int read_write_bits
, len_bits
;
139 int free_debug_register
;
142 /* Look for a free debug register. */
143 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
145 if (address_lookup
[i
- DR_FIRSTADDR
] == 0)
149 /* No more debug registers! */
153 read_write_bits
= (rw
& 1) ? DR_RW_READ
: DR_RW_WRITE
;
160 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
167 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
171 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
173 free_debug_register
= i
;
174 register_number
= free_debug_register
- DR_FIRSTADDR
;
175 debug_control_mirror
|=
176 ((read_write_bits
| len_bits
)
177 << (DR_CONTROL_SHIFT
+ DR_CONTROL_SIZE
* register_number
));
178 debug_control_mirror
|=
179 (1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
180 debug_control_mirror
|= DR_LOCAL_SLOWDOWN
;
181 debug_control_mirror
&= ~DR_CONTROL_RESERVED
;
183 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
184 debug_control_mirror
);
185 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[free_debug_register
]),
188 /* Record where we came from. */
189 address_lookup
[register_number
] = addr
;
194 i386_insert_nonaligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
201 static int size_try_array
[4][4] =
203 { 1, 1, 1, 1 }, /* trying size one */
204 { 2, 1, 2, 1 }, /* trying size two */
205 { 2, 1, 2, 1 }, /* trying size three */
206 { 4, 1, 2, 1 } /* trying size four */
213 /* Four is the maximum length for 386. */
214 size
= size_try_array
[len
> 4 ? 3 : len
- 1][align
];
216 rv
= i386_insert_aligned_watchpoint (pid
, waddr
, addr
, size
, rw
);
219 i386_remove_watchpoint (pid
, waddr
, size
);
228 /* Remove a watchpoint. */
231 i386_remove_watchpoint (int pid
, CORE_ADDR addr
, int len
)
236 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
238 register_number
= i
- DR_FIRSTADDR
;
239 if (address_lookup
[register_number
] == addr
)
241 debug_control_mirror
&=
242 ~(1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
243 address_lookup
[register_number
] = 0;
246 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
247 debug_control_mirror
);
248 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
253 /* Check if stopped by a watchpoint. */
256 i386_stopped_by_watchpoint (int pid
)
261 status
= ptrace (3, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
262 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
264 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
266 if (status
& (1 << (i
- DR_FIRSTADDR
)))
267 return address_lookup
[i
- DR_FIRSTADDR
];
273 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
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