1 /* Intel 386 native support for SYSV 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>
50 /* FIXME: 1998-10-21/jsm: The following used to be just "#include
51 <sys/debugreg.h>", but the the Linux kernel (version 2.1.x) and
52 glibc 2.0.x are not in sync; including <sys/debugreg.h> will result
53 in an error. With luck, these losers will get their act together
54 and we can trash this hack in the near future. */
56 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
57 #ifdef HAVE_ASM_DEBUGREG_H
58 #include <asm/debugreg.h>
60 #include <sys/debugreg.h>
71 #include "floatformat.h"
76 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
77 /* symbols like 'EAX' come from <sys/reg.h> */
86 /* blockend is the value of u.u_ar0, and points to the
87 * place where GS is stored
91 i386_register_u_addr (int blockend
, int regnum
)
98 /* FIXME: Should have better way to test floating point range */
99 if (regnum
>= FP0_REGNUM
&& regnum
<= (FP0_REGNUM
+ 7))
101 #ifdef KSTKSZ /* SCO, and others? */
102 ubase
+= 4 * (SS
+ 1) - KSTKSZ
;
103 fpstate
= ubase
+ ((char *) &u
.u_fps
.u_fpstate
- (char *) &u
);
104 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
106 fpstate
= ubase
+ ((char *) &u
.i387
.st_space
- (char *) &u
);
107 return (fpstate
+ 10 * (regnum
- FP0_REGNUM
));
112 return (ubase
+ 4 * regmap
[regnum
]);
120 return (sizeof (struct user
));
123 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
125 #if !defined (offsetof)
126 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
129 /* Record the value of the debug control register. */
130 static int debug_control_mirror
;
132 /* Record which address associates with which register. */
133 static CORE_ADDR address_lookup
[DR_LASTADDR
- DR_FIRSTADDR
+ 1];
136 i386_insert_aligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int, int);
139 i386_insert_nonaligned_watchpoint (int, CORE_ADDR
, CORE_ADDR
, int, int);
141 /* Insert a watchpoint. */
144 i386_insert_watchpoint (int pid
, CORE_ADDR addr
, int len
, int rw
)
146 return i386_insert_aligned_watchpoint (pid
, addr
, addr
, len
, rw
);
150 i386_insert_aligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
154 int read_write_bits
, len_bits
;
155 int free_debug_register
;
158 /* Look for a free debug register. */
159 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
161 if (address_lookup
[i
- DR_FIRSTADDR
] == 0)
165 /* No more debug registers! */
169 read_write_bits
= (rw
& 1) ? DR_RW_READ
: DR_RW_WRITE
;
176 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
183 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
187 return i386_insert_nonaligned_watchpoint (pid
, waddr
, addr
, len
, rw
);
189 free_debug_register
= i
;
190 register_number
= free_debug_register
- DR_FIRSTADDR
;
191 debug_control_mirror
|=
192 ((read_write_bits
| len_bits
)
193 << (DR_CONTROL_SHIFT
+ DR_CONTROL_SIZE
* register_number
));
194 debug_control_mirror
|=
195 (1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
196 debug_control_mirror
|= DR_LOCAL_SLOWDOWN
;
197 debug_control_mirror
&= ~DR_CONTROL_RESERVED
;
199 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
200 debug_control_mirror
);
201 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[free_debug_register
]),
204 /* Record where we came from. */
205 address_lookup
[register_number
] = addr
;
210 i386_insert_nonaligned_watchpoint (int pid
, CORE_ADDR waddr
, CORE_ADDR addr
,
217 static int size_try_array
[4][4] =
219 { 1, 1, 1, 1 }, /* trying size one */
220 { 2, 1, 2, 1 }, /* trying size two */
221 { 2, 1, 2, 1 }, /* trying size three */
222 { 4, 1, 2, 1 } /* trying size four */
229 /* Four is the maximum length for 386. */
230 size
= size_try_array
[len
> 4 ? 3 : len
- 1][align
];
232 rv
= i386_insert_aligned_watchpoint (pid
, waddr
, addr
, size
, rw
);
235 i386_remove_watchpoint (pid
, waddr
, size
);
244 /* Remove a watchpoint. */
247 i386_remove_watchpoint (int pid
, CORE_ADDR addr
, int len
)
252 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
254 register_number
= i
- DR_FIRSTADDR
;
255 if (address_lookup
[register_number
] == addr
)
257 debug_control_mirror
&=
258 ~(1 << (DR_LOCAL_ENABLE_SHIFT
+ DR_ENABLE_SIZE
* register_number
));
259 address_lookup
[register_number
] = 0;
262 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_CONTROL
]),
263 debug_control_mirror
);
264 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
269 /* Check if stopped by a watchpoint. */
272 i386_stopped_by_watchpoint (int pid
)
277 status
= ptrace (3, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
278 ptrace (6, pid
, offsetof (struct user
, u_debugreg
[DR_STATUS
]), 0);
280 for (i
= DR_FIRSTADDR
; i
<= DR_LASTADDR
; i
++)
282 if (status
& (1 << (i
- DR_FIRSTADDR
)))
283 return address_lookup
[i
- DR_FIRSTADDR
];
289 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
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