1 /* Intel 386 native support for SYSV systems (pre-SVR4).
2 Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996 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, Boston, MA 02111-1307, USA. */
25 # ifdef HAVE_SYS_PTRACE_H
26 # include <sys/ptrace.h>
36 #include <sys/types.h>
39 #include <sys/param.h>
43 #include <sys/ioctl.h>
46 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
47 #include <sys/debugreg.h>
57 #include "floatformat.h"
62 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
63 /* symbols like 'EAX' come from <sys/reg.h> */
72 /* blockend is the value of u.u_ar0, and points to the
73 * place where GS is stored
77 i386_register_u_addr (blockend, regnum)
86 /* FIXME: Should have better way to test floating point range */
87 if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7))
89 #ifdef KSTKSZ /* SCO, and others? */
90 ubase += 4 * (SS + 1) - KSTKSZ;
91 fpstate = ubase + ((char *)&u.u_fps.u_fpstate - (char *)&u);
92 return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
94 fpstate = ubase + ((char *)&u.i387.st_space - (char *)&u);
95 return (fpstate + 10 * (regnum - FP0_REGNUM));
100 return (ubase + 4 * regmap[regnum]);
108 return (sizeof (struct user));
111 #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
113 #if !defined (offsetof)
114 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
117 /* Record the value of the debug control register. */
118 static int debug_control_mirror;
120 /* Record which address associates with which register. */
121 static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
124 i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
128 i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
131 /* Insert a watchpoint. */
134 i386_insert_watchpoint (pid, addr, len, rw)
140 return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
144 i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
152 int read_write_bits, len_bits;
153 int free_debug_register;
156 /* Look for a free debug register. */
157 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
159 if (address_lookup[i - DR_FIRSTADDR] == 0)
163 /* No more debug registers! */
167 read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
174 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
181 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
185 return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
187 free_debug_register = i;
188 register_number = free_debug_register - DR_FIRSTADDR;
189 debug_control_mirror |=
190 ((read_write_bits | len_bits)
191 << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
192 debug_control_mirror |=
193 (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
194 debug_control_mirror |= DR_LOCAL_SLOWDOWN;
195 debug_control_mirror &= ~DR_CONTROL_RESERVED;
197 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
198 debug_control_mirror);
199 ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
202 /* Record where we came from. */
203 address_lookup[register_number] = addr;
208 i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
219 static int size_try_array[16] = {
220 1, 1, 1, 1, /* trying size one */
221 2, 1, 2, 1, /* trying size two */
222 2, 1, 2, 1, /* trying size three */
223 4, 1, 2, 1 /* trying size four */
230 /* Four is the maximum length for 386. */
231 size = (len > 4) ? 3 : len - 1;
232 size = size_try_array[size * 4 + align];
234 rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
237 i386_remove_watchpoint (pid, waddr, size);
246 /* Remove a watchpoint. */
249 i386_remove_watchpoint (pid, addr, len)
257 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
259 register_number = i - DR_FIRSTADDR;
260 if (address_lookup[register_number] == addr)
262 debug_control_mirror &=
263 ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
264 address_lookup[register_number] = 0;
267 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
268 debug_control_mirror);
269 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
274 /* Check if stopped by a watchpoint. */
277 i386_stopped_by_watchpoint (pid)
283 status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
284 ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
286 for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
288 if (status & (1 << (i - DR_FIRSTADDR)))
289 return address_lookup[i - DR_FIRSTADDR];
295 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
298 /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
299 via a command xxx and eventually calls ptrace without ever having
300 traversed the target vector. This would be terribly impolite
301 behaviour for a sun4 hosted remote gdb.
303 A fix might be to move this code into the "info registers" command.
304 rich@cygnus.com 15 Sept 92. */
307 struct user u; /* just for address computations */
309 /* fpstate defined in <sys/user.h> */
310 struct fpstate *fpstatep;
311 char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
314 unsigned int rounded_addr;
315 unsigned int rounded_size;
319 uaddr = (char *)&u.u_fpvalid - (char *)&u;
320 if (target_has_execution)
325 rounded_addr = uaddr & -sizeof (int);
326 data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
327 mask = 0xff << ((uaddr - rounded_addr) * 8);
329 fpvalid = ((data & mask) != 0);
334 if (lseek (corechan, uaddr, 0) < 0)
335 perror ("seek on core file");
336 if (myread (corechan, &fpvalid, 1) < 0)
337 perror ("read on core file");
340 #endif /* no core support yet */
344 printf_unfiltered ("no floating point status saved\n");
348 uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
349 if (target_has_execution)
353 rounded_addr = uaddr & -sizeof (int);
354 rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
355 sizeof (int) - 1) / sizeof (int);
356 skip = uaddr - rounded_addr;
359 for (i = 0; i < rounded_size; i++)
361 *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
362 rounded_addr += sizeof (int);
368 if (lseek (corechan, uaddr, 0) < 0)
369 perror_with_name ("seek on core file");
370 if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
371 perror_with_name ("read from core file");
376 fpstatep = (struct fpstate *)(buf + skip);
377 print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);