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>
39 #include <sys/types.h>
42 #include <sys/param.h>
46 #include <sys/ioctl.h>
49 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
50 #include <sys/debugreg.h>
60 #include "floatformat.h"
65 /* Mapping between the general-purpose registers in `struct user'
66 format and GDB's register array layout. */
75 /* Support for the user struct. */
77 /* Return the address of register REGNUM. BLOCKEND is the value of
78 u.u_ar0, and points to the place where GS is stored. */
81 register_u_addr (CORE_ADDR blockend
, int regnum
)
86 if (FP_REGNUM_P (regnum
))
88 #ifdef KSTKSZ /* SCO, and others? */
89 blockend
+= 4 * (SS
+ 1) - KSTKSZ
;
90 fpstate
= blockend
+ ((char *) &u
.u_fps
.u_fpstate
- (char *) &u
);
91 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
93 fpstate
= blockend
+ ((char *) &u
.i387
.st_space
- (char *) &u
);
94 return (fpstate
+ 10 * (regnum
- FP0_REGNUM
));
98 return (blockend
+ 4 * regmap
[regnum
]);
101 /* Return the size of the user struct. */
106 return (sizeof (struct user
));
109 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
111 #if !defined (offsetof)
112 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
115 /* Record the value of the debug control register. */
116 static int debug_control_mirror
;
118 /* Record which address associates with which register. */
119 static CORE_ADDR address_lookup
[DR_LASTADDR
- DR_FIRSTADDR
+ 1];
122 i386_insert_aligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int, int);
125 i386_insert_nonaligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int, int);
127 /* Insert a watchpoint. */
130 i386_insert_watchpoint (int pid
, CORE_ADDR addr
, int len
, int rw
)
132 return i386_insert_aligned_watchpoint (pid
, addr
, addr
, len
, rw
);
136 i386_insert_aligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
140 int read_write_bits
, len_bits
;
141 int free_debug_register
;
144 /* Look for a free debug register. */
145 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
147 if (address_lookup
[i
- DR_FIRSTADDR
] == 0)
151 /* No more debug registers! */
155 read_write_bits
= (rw
& 1) ? DR_RW_READ
: DR_RW_WRITE
;
162 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
169 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
173 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
175 free_debug_register
= i
;
176 register_number
= free_debug_register
- DR_FIRSTADDR
;
177 debug_control_mirror
|=
178 ((read_write_bits
| len_bits
)
179 << (DR_CONTROL_SHIFT
+ DR_CONTROL_SIZE
* register_number
));
180 debug_control_mirror
|=
181 (1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
182 debug_control_mirror
|= DR_LOCAL_SLOWDOWN
;
183 debug_control_mirror
&= ~DR_CONTROL_RESERVED
;
185 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
186 debug_control_mirror
);
187 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[free_debug_register
]),
190 /* Record where we came from. */
191 address_lookup
[register_number
] = addr
;
196 i386_insert_nonaligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
203 static int size_try_array
[4][4] =
205 { 1, 1, 1, 1 }, /* trying size one */
206 { 2, 1, 2, 1 }, /* trying size two */
207 { 2, 1, 2, 1 }, /* trying size three */
208 { 4, 1, 2, 1 } /* trying size four */
215 /* Four is the maximum length for 386. */
216 size
= size_try_array
[len
> 4 ? 3 : len
- 1][align
];
218 rv
= i386_insert_aligned_watchpoint (pid
, waddr
, addr
, size
, rw
);
221 i386_remove_watchpoint (pid
, waddr
, size
);
230 /* Remove a watchpoint. */
233 i386_remove_watchpoint (int pid
, CORE_ADDR addr
, int len
)
238 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
240 register_number
= i
- DR_FIRSTADDR
;
241 if (address_lookup
[register_number
] == addr
)
243 debug_control_mirror
&=
244 ~(1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
245 address_lookup
[register_number
] = 0;
248 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
249 debug_control_mirror
);
250 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
255 /* Check if stopped by a watchpoint. */
258 i386_stopped_by_watchpoint (int pid
)
263 status
= ptrace (3, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
264 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
266 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
268 if (status
& (1 << (i
- DR_FIRSTADDR
)))
269 return address_lookup
[i
- DR_FIRSTADDR
];
275 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
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