[binutils.git] / gdb / i386v-nat.c

/* Intel 386 native support for SYSV systems (pre-SVR4).
   Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"

#ifdef HAVE_PTRACE_H
# include <ptrace.h>
#else
# ifdef HAVE_SYS_PTRACE_H
#  include <sys/ptrace.h>
# endif
#endif

#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"

#ifdef USG
#include <sys/types.h>
#endif

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>


/* FIXME: The following used to be just "#include <sys/debugreg.h>", but
 * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
 * <sys/debugreg.h> will result in an error.  With luck, these losers
 * will get their act together and we can trash this hack in the near future.
 * --jsm 1998-10-21
 */

#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
# ifdef HAVE_ASM_DEBUGREG_H
#  include <asm/debugreg.h>
# else
#  include <sys/debugreg.h>
# endif
#endif

#include <sys/file.h>
#include "gdb_stat.h"

#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif

#include "floatformat.h"

#include "target.h"

\f
/* this table must line up with REGISTER_NAMES in tm-i386v.h */
/* symbols like 'EAX' come from <sys/reg.h> */
static int regmap[] = 
{
  EAX, ECX, EDX, EBX,
  UESP, EBP, ESI, EDI,
  EIP, EFL, CS, SS,
  DS, ES, FS, GS,
};

/* blockend is the value of u.u_ar0, and points to the
 * place where GS is stored
 */

int
i386_register_u_addr (blockend, regnum)
     int blockend;
     int regnum;
{
  struct user u;
  int fpstate;
  int ubase;

  ubase = blockend;
  /* FIXME:  Should have better way to test floating point range */
  if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7)) 
    {
#ifdef KSTKSZ	/* SCO, and others? */
      ubase += 4 * (SS + 1) - KSTKSZ;
      fpstate = ubase + ((char *)&u.u_fps.u_fpstate - (char *)&u);
      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
#else
      fpstate = ubase + ((char *)&u.i387.st_space - (char *)&u);
      return (fpstate + 10 * (regnum - FP0_REGNUM));
#endif
    } 
  else
    {
      return (ubase + 4 * regmap[regnum]);
    }
  
}
\f
int
kernel_u_size ()
{
  return (sizeof (struct user));
}
\f
#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS

#if !defined (offsetof)
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif

/* Record the value of the debug control register.  */
static int debug_control_mirror;

/* Record which address associates with which register.  */
static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];

static int
i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
					   int));

static int
i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
					   int));

/* Insert a watchpoint.  */

int
i386_insert_watchpoint (pid, addr, len, rw)
     int pid;
     CORE_ADDR addr;
     int len;
     int rw;
{
  return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
}

static int
i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
     int pid;
     CORE_ADDR waddr;
     CORE_ADDR addr;
     int len;
     int rw;
{
  int i;
  int read_write_bits, len_bits;
  int free_debug_register;
  int register_number;
  
  /* Look for a free debug register.  */
  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
    {
      if (address_lookup[i - DR_FIRSTADDR] == 0)
	break;
    }

  /* No more debug registers!  */
  if (i > DR_LASTADDR)
    return -1;

  read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;

  if (len == 1)
    len_bits = DR_LEN_1;
  else if (len == 2)
    {
      if (addr % 2)
	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
      len_bits = DR_LEN_2;
    }

  else if (len == 4)
    {
      if (addr % 4)
	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
      len_bits = DR_LEN_4;
    }
  else
    return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
  
  free_debug_register = i;
  register_number = free_debug_register - DR_FIRSTADDR;
  debug_control_mirror |=
    ((read_write_bits | len_bits)
     << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
  debug_control_mirror |=
    (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
  debug_control_mirror |= DR_LOCAL_SLOWDOWN;
  debug_control_mirror &= ~DR_CONTROL_RESERVED;
  
  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
	  debug_control_mirror);
  ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
	  addr);

  /* Record where we came from.  */
  address_lookup[register_number] = addr;
  return 0;
}

static int
i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
     int pid;
     CORE_ADDR waddr;
     CORE_ADDR addr;
     int len;
     int rw;
{
  int align;
  int size;
  int rv;

  static int size_try_array[16] = {
    1, 1, 1, 1,			/* trying size one */
    2, 1, 2, 1,			/* trying size two */
    2, 1, 2, 1,			/* trying size three */
    4, 1, 2, 1			/* trying size four */
  };

  rv = 0;
  while (len > 0)
    {
      align = addr % 4;
      /* Four is the maximum length for 386.  */
      size = (len > 4) ? 3 : len - 1;
      size = size_try_array[size * 4 + align];

      rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
      if (rv)
	{
	  i386_remove_watchpoint (pid, waddr, size);
	  return rv;
	}
      addr += size;
      len -= size;
    }
  return rv;
}

/* Remove a watchpoint.  */

int
i386_remove_watchpoint (pid, addr, len)
     int pid;
     CORE_ADDR addr;
     int len;
{
  int i;
  int register_number;

  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
    {
      register_number = i - DR_FIRSTADDR;
      if (address_lookup[register_number] == addr)
	{
	  debug_control_mirror &=
	    ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
	  address_lookup[register_number] = 0;
	}
    }
  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
	  debug_control_mirror);
  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);

  return 0;
}

/* Check if stopped by a watchpoint.  */

CORE_ADDR
i386_stopped_by_watchpoint (pid)
    int pid;
{
  int i;
  int status;

  status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);

  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
    {
      if (status & (1 << (i - DR_FIRSTADDR)))
	return address_lookup[i - DR_FIRSTADDR];
    }

  return 0;
}

#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */

#if 0
/* using FLOAT_INFO as is would be a problem.  FLOAT_INFO is called
   via a command xxx and eventually calls ptrace without ever having
   traversed the target vector.  This would be terribly impolite
   behaviour for a sun4 hosted remote gdb.

   A fix might be to move this code into the "info registers" command.
   rich@cygnus.com 15 Sept 92. */
i386_float_info ()
{
  struct user u; /* just for address computations */
  int i;
  /* fpstate defined in <sys/user.h> */
  struct fpstate *fpstatep;
  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
  unsigned int uaddr;
  char fpvalid = 0;
  unsigned int rounded_addr;
  unsigned int rounded_size;
  extern int corechan;
  int skip;
  
  uaddr = (char *)&u.u_fpvalid - (char *)&u;
  if (target_has_execution)
    {
      unsigned int data;
      unsigned int mask;
      
      rounded_addr = uaddr & -sizeof (int);
      data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
      mask = 0xff << ((uaddr - rounded_addr) * 8);
      
      fpvalid = ((data & mask) != 0);
    } 
#if 0
  else 
    {
      if (lseek (corechan, uaddr, 0) < 0)
	perror ("seek on core file");
      if (myread (corechan, &fpvalid, 1) < 0) 
	perror ("read on core file");
      
    }
#endif	/* no core support yet */
  
  if (fpvalid == 0) 
    {
      printf_unfiltered ("no floating point status saved\n");
      return;
    }
  
  uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
  if (target_has_execution)
    {
      int *ip;
      
      rounded_addr = uaddr & -sizeof (int);
      rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
		      sizeof (int) - 1) / sizeof (int);
      skip = uaddr - rounded_addr;
      
      ip = (int *)buf;
      for (i = 0; i < rounded_size; i++) 
	{
	  *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
	  rounded_addr += sizeof (int);
	}
    } 
#if 0
  else 
    {
      if (lseek (corechan, uaddr, 0) < 0)
	perror_with_name ("seek on core file");
      if (myread (corechan, buf, sizeof (struct fpstate)) < 0) 
	perror_with_name ("read from core file");
      skip = 0;
    }
#endif	/* 0 */ 

  fpstatep = (struct fpstate *)(buf + skip);
  print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
}

#endif /* never */
Commit	Line	Data
c906108c SS	1	/* Intel 386 native support for SYSV systems (pre-SVR4).
	2	Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	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.
	10
	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.
	15
	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. */
	19
	20	#include "defs.h"
	21
	22	#ifdef HAVE_PTRACE_H
	23	# include <ptrace.h>
	24	#else
	25	# ifdef HAVE_SYS_PTRACE_H
	26	# include <sys/ptrace.h>
	27	# endif
	28	#endif
	29
	30	#include "frame.h"
	31	#include "inferior.h"
	32	#include "language.h"
	33	#include "gdbcore.h"
	34
	35	#ifdef USG
	36	#include <sys/types.h>
	37	#endif
	38
	39	#include <sys/param.h>
	40	#include <sys/dir.h>
	41	#include <signal.h>
	42	#include <sys/user.h>
	43	#include <sys/ioctl.h>
	44	#include <fcntl.h>
	45
	46
	47	/* FIXME: The following used to be just "#include <sys/debugreg.h>", but
	48	* the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
	49	* <sys/debugreg.h> will result in an error. With luck, these losers
	50	* will get their act together and we can trash this hack in the near future.
	51	* --jsm 1998-10-21
	52	*/
	53
	54	#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
	55	# ifdef HAVE_ASM_DEBUGREG_H
	56	# include <asm/debugreg.h>
	57	# else
	58	# include <sys/debugreg.h>
	59	# endif
	60	#endif
	61
	62	#include <sys/file.h>
	63	#include "gdb_stat.h"
	64
65	#ifdef HAVE_SYS_REG_H
66	#include <sys/reg.h>
67	#endif
68
69	#include "floatformat.h"
70
71	#include "target.h"
72
73	\f
74	/* this table must line up with REGISTER_NAMES in tm-i386v.h */
75	/* symbols like 'EAX' come from <sys/reg.h> */
76	static int regmap[] =
77	{
78	EAX, ECX, EDX, EBX,
79	UESP, EBP, ESI, EDI,
80	EIP, EFL, CS, SS,
81	DS, ES, FS, GS,
82	};
83
84	/* blockend is the value of u.u_ar0, and points to the
85	* place where GS is stored
86	*/
87
88	int
89	i386_register_u_addr (blockend, regnum)
90	int blockend;
91	int regnum;
92	{
93	struct user u;
94	int fpstate;
95	int ubase;
96
97	ubase = blockend;
98	/* FIXME: Should have better way to test floating point range */
99	if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7))
100	{
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));
105	#else
106	fpstate = ubase + ((char )&u.i387.st_space - (char )&u);
107	return (fpstate + 10 * (regnum - FP0_REGNUM));
108	#endif
109	}
110	else
111	{
112	return (ubase + 4 * regmap[regnum]);
113	}
114
115	}
116	\f
117	int
118	kernel_u_size ()
119	{
120	return (sizeof (struct user));
121	}
122	\f
123	#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
124
125	#if !defined (offsetof)
126	#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
127	#endif
128
129	/* Record the value of the debug control register. */
130	static int debug_control_mirror;
131
132	/* Record which address associates with which register. */
133	static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
134
135	static int
136	i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
137	int));
138
139	static int
140	i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
141	int));
142
143	/* Insert a watchpoint. */
144
145	int
146	i386_insert_watchpoint (pid, addr, len, rw)
147	int pid;
148	CORE_ADDR addr;
149	int len;
150	int rw;
151	{
152	return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
153	}
154
155	static int
156	i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
157	int pid;
158	CORE_ADDR waddr;
159	CORE_ADDR addr;
160	int len;
161	int rw;
162	{
163	int i;
164	int read_write_bits, len_bits;
165	int free_debug_register;
166	int register_number;
167
168	/* Look for a free debug register. */
169	for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
170	{
171	if (address_lookup[i - DR_FIRSTADDR] == 0)
172	break;
173	}
174
175	/* No more debug registers! */
176	if (i > DR_LASTADDR)
177	return -1;
178
179	read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
180
181	if (len == 1)
182	len_bits = DR_LEN_1;
183	else if (len == 2)
184	{
185	if (addr % 2)
186	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
187	len_bits = DR_LEN_2;
188	}
189
190	else if (len == 4)
191	{
192	if (addr % 4)
193	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
194	len_bits = DR_LEN_4;
195	}
196	else
197	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
198
199	free_debug_register = i;
200	register_number = free_debug_register - DR_FIRSTADDR;
201	debug_control_mirror \|=
202	((read_write_bits \| len_bits)
203	<< (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
204	debug_control_mirror \|=
205	(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
206	debug_control_mirror \|= DR_LOCAL_SLOWDOWN;
207	debug_control_mirror &= ~DR_CONTROL_RESERVED;
208
209	ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
210	debug_control_mirror);
211	ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
212	addr);
213
214	/* Record where we came from. */
215	address_lookup[register_number] = addr;
216	return 0;
217	}
218
219	static int
220	i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
221	int pid;
222	CORE_ADDR waddr;
223	CORE_ADDR addr;
224	int len;
225	int rw;
226	{
227	int align;
228	int size;
229	int rv;
230
231	static int size_try_array[16] = {
232	1, 1, 1, 1, /* trying size one */
233	2, 1, 2, 1, /* trying size two */
234	2, 1, 2, 1, /* trying size three */
235	4, 1, 2, 1 /* trying size four */
236	};
237
238	rv = 0;
239	while (len > 0)
240	{
241	align = addr % 4;
242	/* Four is the maximum length for 386. */
243	size = (len > 4) ? 3 : len - 1;
244	size = size_try_array[size * 4 + align];
245
246	rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
247	if (rv)
248	{
249	i386_remove_watchpoint (pid, waddr, size);
250	return rv;
251	}
252	addr += size;
253	len -= size;
254	}
255	return rv;
256	}
257
258	/* Remove a watchpoint. */
259
260	int
261	i386_remove_watchpoint (pid, addr, len)
262	int pid;
263	CORE_ADDR addr;
264	int len;
265	{
266	int i;
267	int register_number;
268
269	for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
270	{
271	register_number = i - DR_FIRSTADDR;
272	if (address_lookup[register_number] == addr)
273	{
274	debug_control_mirror &=
275	~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
276	address_lookup[register_number] = 0;
277	}
278	}
279	ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
280	debug_control_mirror);
281	ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
282
283	return 0;
284	}
285
286	/* Check if stopped by a watchpoint. */
287
288	CORE_ADDR
289	i386_stopped_by_watchpoint (pid)
290	int pid;
291	{
292	int i;
293	int status;
294
295	status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
296	ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
297
298	for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
299	{
300	if (status & (1 << (i - DR_FIRSTADDR)))
301	return address_lookup[i - DR_FIRSTADDR];
302	}
303
304	return 0;
305	}
306
307	#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
308
309	#if 0
310	/* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
311	via a command xxx and eventually calls ptrace without ever having
312	traversed the target vector. This would be terribly impolite
313	behaviour for a sun4 hosted remote gdb.
314
315	A fix might be to move this code into the "info registers" command.
316	rich@cygnus.com 15 Sept 92. */
317	i386_float_info ()
318	{
319	struct user u; /* just for address computations */
320	int i;
321	/* fpstate defined in <sys/user.h> */
322	struct fpstate *fpstatep;
323	char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
324	unsigned int uaddr;
325	char fpvalid = 0;
326	unsigned int rounded_addr;
327	unsigned int rounded_size;
328	extern int corechan;
329	int skip;
330
331	uaddr = (char )&u.u_fpvalid - (char )&u;
332	if (target_has_execution)
333	{
334	unsigned int data;
335	unsigned int mask;
336
337	rounded_addr = uaddr & -sizeof (int);
338	data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
339	mask = 0xff << ((uaddr - rounded_addr) * 8);
340
341	fpvalid = ((data & mask) != 0);
342	}
343	#if 0
344	else
345	{
346	if (lseek (corechan, uaddr, 0) < 0)
347	perror ("seek on core file");
348	if (myread (corechan, &fpvalid, 1) < 0)
349	perror ("read on core file");
350
351	}
352	#endif /* no core support yet */
353
354	if (fpvalid == 0)
355	{
356	printf_unfiltered ("no floating point status saved\n");
357	return;
358	}
359
360	uaddr = (char )&U_FPSTATE(u) - (char )&u;
361	if (target_has_execution)
362	{
363	int *ip;
364
365	rounded_addr = uaddr & -sizeof (int);
366	rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
367	sizeof (int) - 1) / sizeof (int);
368	skip = uaddr - rounded_addr;
369
370	ip = (int *)buf;
371	for (i = 0; i < rounded_size; i++)
372	{
373	*ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
374	rounded_addr += sizeof (int);
375	}
376	}
377	#if 0
378	else
379	{
380	if (lseek (corechan, uaddr, 0) < 0)
381	perror_with_name ("seek on core file");
382	if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
383	perror_with_name ("read from core file");
384	skip = 0;
385	}
386	#endif /* 0 */
387
388	fpstatep = (struct fpstate *)(buf + skip);
389	print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
390	}
391
392	#endif /* never */