1 /* Intel 386 native support for SYSV systems (pre-SVR4).
2 Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
26 #ifdef HAVE_SYS_PTRACE_H
27 #include <sys/ptrace.h>
37 #include <sys/types.h>
40 #include <sys/param.h>
44 #include <sys/ioctl.h>
48 /* FIXME: The following used to be just "#include <sys/debugreg.h>", but
49 * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
50 * <sys/debugreg.h> will result in an error. With luck, these losers
51 * will get their act together and we can trash this hack in the near future.
55 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
56 #ifdef HAVE_ASM_DEBUGREG_H
57 #include <asm/debugreg.h>
59 #include <sys/debugreg.h>
70 #include "floatformat.h"
75 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
76 /* symbols like 'EAX' come from <sys/reg.h> */
85 /* blockend is the value of u.u_ar0, and points to the
86 * place where GS is stored
90 i386_register_u_addr (int blockend, int regnum)
97 /* FIXME: Should have better way to test floating point range */
98 if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7))
100 #ifdef KSTKSZ /* SCO, and others? */
101 ubase += 4 * (SS + 1) - KSTKSZ;
102 fpstate = ubase + ((char *) &u.u_fps.u_fpstate - (char *) &u);
103 return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
105 fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
106 return (fpstate + 10 * (regnum - FP0_REGNUM));
111 return (ubase + 4 * regmap[regnum]);
119 return (sizeof (struct user));
122 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
124 #if !defined (offsetof)
125 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
128 /* Record the value of the debug control register. */
129 static int debug_control_mirror;
131 /* Record which address associates with which register. */
132 static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
135 i386_insert_aligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int);
138 i386_insert_nonaligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int);
140 /* Insert a watchpoint. */
143 i386_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
145 return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
149 i386_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
153 int read_write_bits, len_bits;
154 int free_debug_register;
157 /* Look for a free debug register. */
158 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
160 if (address_lookup[i - DR_FIRSTADDR] == 0)
164 /* No more debug registers! */
168 read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
175 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
182 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
186 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
188 free_debug_register = i;
189 register_number = free_debug_register - DR_FIRSTADDR;
190 debug_control_mirror |=
191 ((read_write_bits | len_bits)
192 << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
193 debug_control_mirror |=
194 (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
195 debug_control_mirror |= DR_LOCAL_SLOWDOWN;
196 debug_control_mirror &= ~DR_CONTROL_RESERVED;
198 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
199 debug_control_mirror);
200 ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
203 /* Record where we came from. */
204 address_lookup[register_number] = addr;
209 i386_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
216 static int size_try_array[4][4] =
218 { 1, 1, 1, 1 }, /* trying size one */
219 { 2, 1, 2, 1 }, /* trying size two */
220 { 2, 1, 2, 1 }, /* trying size three */
221 { 4, 1, 2, 1 } /* trying size four */
228 /* Four is the maximum length for 386. */
229 size = size_try_array[len > 4 ? 3 : len - 1][align];
231 rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
234 i386_remove_watchpoint (pid, waddr, size);
243 /* Remove a watchpoint. */
246 i386_remove_watchpoint (int pid, CORE_ADDR addr, int len)
251 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
253 register_number = i - DR_FIRSTADDR;
254 if (address_lookup[register_number] == addr)
256 debug_control_mirror &=
257 ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
258 address_lookup[register_number] = 0;
261 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
262 debug_control_mirror);
263 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
268 /* Check if stopped by a watchpoint. */
271 i386_stopped_by_watchpoint (int pid)
276 status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
277 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
279 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
281 if (status & (1 << (i - DR_FIRSTADDR)))
282 return address_lookup[i - DR_FIRSTADDR];
288 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */