[deliverable/binutils-gdb.git] / gdb / i386bsd-tdep.c

/* Target-dependent code for i386 BSD's.
   Copyright 2001, 2002 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"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"

#include "i386-tdep.h"

/* Support for signal handlers.  */

/* Return whether PC is in a BSD sigtramp routine.  */

static int
i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);

  return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
}

/* Assuming FRAME is for a BSD sigtramp routine, return the address of
   the associated sigcontext structure.  */

static CORE_ADDR
i386bsd_sigcontext_addr (struct frame_info *frame)
{
  if (frame->next)
    /* If this isn't the top frame, the next frame must be for the
       signal handler itself.  A pointer to the sigcontext structure
       is passed as the third argument to the signal handler.  */
    return read_memory_unsigned_integer (frame->next->frame + 16, 4);

  /* This is the top frame.  We'll have to find the address of the
     sigcontext structure by looking at the stack pointer.  */
  return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
}

/* Assuming FRAME is for a BSD sigtramp routine, return the saved
   program counter.

   Note: This function is used for Solaris 2 too, so don't make it
   static.  */

CORE_ADDR
i386bsd_sigtramp_saved_pc (struct frame_info *frame)
{
  int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset;
  CORE_ADDR addr;

  addr = i386bsd_sigcontext_addr (frame);
  return read_memory_unsigned_integer (addr + sc_pc_offset, 4);
}

/* Return the saved program counter for FRAME.  */

static CORE_ADDR
i386bsd_frame_saved_pc (struct frame_info *frame)
{
  if (frame->signal_handler_caller)
    return i386bsd_sigtramp_saved_pc (frame);

  return read_memory_unsigned_integer (frame->frame + 4, 4);
}

/* Return the start address of the sigtramp routine.  */

CORE_ADDR
i386bsd_sigtramp_start (CORE_ADDR pc)
{
  return gdbarch_tdep (current_gdbarch)->sigtramp_start;
}

/* Return the end address of the sigtramp routine.  */

CORE_ADDR
i386bsd_sigtramp_end (CORE_ADDR pc)
{
  return gdbarch_tdep (current_gdbarch)->sigtramp_end;
}
\f

/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */

/* From <machine/signal.h>.  */
int i386bsd_sc_pc_offset = 20;

static void
i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);

  tdep->jb_pc_offset = 0;

  tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc;
  tdep->sigtramp_start = 0xfdbfdfc0;
  tdep->sigtramp_end = 0xfdbfe000;
  tdep->sc_pc_offset = i386bsd_sc_pc_offset;
}

/* NetBSD 1.0 or later.  */

/* From <machine/signal.h>.  */
int i386nbsd_sc_pc_offset = 44;

static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Obviously NetBSD is BSD-based.  */
  i386bsd_init_abi (info, gdbarch);

  /* NetBSD uses -freg-struct-return by default.  */
  tdep->struct_return = reg_struct_return;

  /* NetBSD uses a different memory layout.  */
  tdep->sigtramp_start = 0xbfbfdf20;
  tdep->sigtramp_end = 0xbfbfdff0;

  /* NetBSD has a `struct sigcontext' that's different from the
     origional 4.3 BSD.  */
  tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
}

/* NetBSD ELF.  */
static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* It's still NetBSD.  */
  i386nbsd_init_abi (info, gdbarch);

  /* But ELF-based.  */
  i386_elf_init_abi (info, gdbarch);

  /* NetBSD ELF uses -fpcc-struct-return by default.  */
  tdep->struct_return = pcc_struct_return;

  /* We support the SSE registers on NetBSD ELF.  */
  tdep->num_xmm_regs = I386_NUM_XREGS - 1;
  set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
			+ I386_NUM_XREGS);
}

/* FreeBSD 3.0-RELEASE or later.  */

CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20;
CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0;

static void
i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Obviously FreeBSD is BSD-based.  */
  i386bsd_init_abi (info, gdbarch);

  /* FreeBSD uses -freg-struct-return by default.  */
  tdep->struct_return = reg_struct_return;

  /* FreeBSD uses a different memory layout.  */
  tdep->sigtramp_start = i386fbsd_sigtramp_start;
  tdep->sigtramp_end = i386fbsd_sigtramp_end;
}

static void
i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  /* It's almost identical to FreeBSD a.out.  */
  i386fbsdaout_init_abi (info, gdbarch);

  /* Except that it uses ELF.  */
  i386_elf_init_abi (info, gdbarch);
}

/* FreeBSD 4.0-RELEASE or later.  */

/* From <machine/signal.h>.  */
int i386fbsd4_sc_pc_offset = 76;

static void
i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Inherit stuff from older releases.  We assume that FreeBSD
     4.0-RELEASE always uses ELF.  */
  i386fbsd_init_abi (info, gdbarch);

  /* FreeBSD 4.0 introduced a new `struct sigcontext'.  */
  tdep->sc_pc_offset = i386fbsd4_sc_pc_offset;
}

\f
static enum gdb_osabi
i386bsd_aout_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
    return GDB_OSABI_NETBSD_AOUT;

  if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
    return GDB_OSABI_FREEBSD_AOUT;

  return GDB_OSABI_UNKNOWN;
}

\f
/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_i386bsd_tdep (void);

void
_initialize_i386bsd_tdep (void)
{
  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
				  i386bsd_aout_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
			  i386nbsd_init_abi);
  gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
 			  i386nbsdelf_init_abi);
  gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT,
			  i386fbsdaout_init_abi);
  gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF,
			  i386fbsd4_init_abi);
}
Commit	Line	Data
b7247919	1	/* Target-dependent code for i386 BSD's.
8201327c	2	Copyright 2001, 2002 Free Software Foundation, Inc.
b7247919 MK	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,
	19	Boston, MA 02111-1307, USA. */
	20
	21	#include "defs.h"
	22	#include "frame.h"
	23	#include "gdbcore.h"
	24	#include "regcache.h"
	25
8201327c	26	#include "i386-tdep.h"
b7247919	27
8201327c	28	/* Support for signal handlers. */
b7247919 MK	29
	30	/* Return whether PC is in a BSD sigtramp routine. */
	31
8201327c MK	32	static int
8201327c MK	33	i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
b7247919	34	{
8201327c	35	struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
b7247919	36
8201327c MK	37	return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
8201327c MK	38	}
b7247919 MK	39
	40	/* Assuming FRAME is for a BSD sigtramp routine, return the address of
	41	the associated sigcontext structure. */
	42
	43	static CORE_ADDR
	44	i386bsd_sigcontext_addr (struct frame_info *frame)
	45	{
	46	if (frame->next)
	47	/* If this isn't the top frame, the next frame must be for the
	48	signal handler itself. A pointer to the sigcontext structure
	49	is passed as the third argument to the signal handler. */
	50	return read_memory_unsigned_integer (frame->next->frame + 16, 4);
	51
	52	/* This is the top frame. We'll have to find the address of the
	53	sigcontext structure by looking at the stack pointer. */
	54	return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
	55	}
	56
	57	/* Assuming FRAME is for a BSD sigtramp routine, return the saved
8201327c	58	program counter.
b7247919	59
8201327c MK	60	Note: This function is used for Solaris 2 too, so don't make it
	61	static. */
	62
	63	CORE_ADDR
b7247919 MK	64	i386bsd_sigtramp_saved_pc (struct frame_info *frame)
b7247919 MK	65	{
8201327c	66	int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset;
b7247919	67	CORE_ADDR addr;
8201327c	68
b7247919	69	addr = i386bsd_sigcontext_addr (frame);
8201327c	70	return read_memory_unsigned_integer (addr + sc_pc_offset, 4);
b7247919 MK	71	}
	72
	73	/* Return the saved program counter for FRAME. */
	74
8201327c	75	static CORE_ADDR
b7247919 MK	76	i386bsd_frame_saved_pc (struct frame_info *frame)
	77	{
	78	if (frame->signal_handler_caller)
	79	return i386bsd_sigtramp_saved_pc (frame);
	80
	81	return read_memory_unsigned_integer (frame->frame + 4, 4);
	82	}
8201327c MK	83
	84	/* Return the start address of the sigtramp routine. */
	85
	86	CORE_ADDR
	87	i386bsd_sigtramp_start (CORE_ADDR pc)
	88	{
	89	return gdbarch_tdep (current_gdbarch)->sigtramp_start;
	90	}
	91
	92	/* Return the end address of the sigtramp routine. */
	93
	94	CORE_ADDR
	95	i386bsd_sigtramp_end (CORE_ADDR pc)
	96	{
	97	return gdbarch_tdep (current_gdbarch)->sigtramp_end;
	98	}
	99	\f
	100
	101	/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
	102
	103	/* From <machine/signal.h>. */
	104	int i386bsd_sc_pc_offset = 20;
	105
	106	static void
	107	i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	108	{
	109	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	110
	111	set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
	112
	113	tdep->jb_pc_offset = 0;
	114
	115	tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc;
	116	tdep->sigtramp_start = 0xfdbfdfc0;
	117	tdep->sigtramp_end = 0xfdbfe000;
	118	tdep->sc_pc_offset = i386bsd_sc_pc_offset;
	119	}
	120
	121	/* NetBSD 1.0 or later. */
	122
	123	/* From <machine/signal.h>. */
	124	int i386nbsd_sc_pc_offset = 44;
	125
	126	static void
	127	i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	128	{
	129	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	130
	131	/* Obviously NetBSD is BSD-based. */
	132	i386bsd_init_abi (info, gdbarch);
	133
	134	/* NetBSD uses -freg-struct-return by default. */
	135	tdep->struct_return = reg_struct_return;
	136
	137	/* NetBSD uses a different memory layout. */
	138	tdep->sigtramp_start = 0xbfbfdf20;
	139	tdep->sigtramp_end = 0xbfbfdff0;
	140
	141	/* NetBSD has a `struct sigcontext' that's different from the
	142	origional 4.3 BSD. */
	143	tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
	144	}
	145
	146	/* NetBSD ELF. */
147	static void
148	i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
149	{
150	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
151
152	/* It's still NetBSD. */
153	i386nbsd_init_abi (info, gdbarch);
154
155	/* But ELF-based. */
156	i386_elf_init_abi (info, gdbarch);
157
158	/* NetBSD ELF uses -fpcc-struct-return by default. */
159	tdep->struct_return = pcc_struct_return;
160
161	/* We support the SSE registers on NetBSD ELF. */
162	tdep->num_xmm_regs = I386_NUM_XREGS - 1;
163	set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
164	+ I386_NUM_XREGS);
165	}
166
167	/* FreeBSD 3.0-RELEASE or later. */
168
169	CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20;
170	CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0;
171
172	static void
173	i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
174	{
175	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
176
177	/* Obviously FreeBSD is BSD-based. */
178	i386bsd_init_abi (info, gdbarch);
179
180	/* FreeBSD uses -freg-struct-return by default. */
181	tdep->struct_return = reg_struct_return;
182
183	/* FreeBSD uses a different memory layout. */
184	tdep->sigtramp_start = i386fbsd_sigtramp_start;
185	tdep->sigtramp_end = i386fbsd_sigtramp_end;
186	}
187
188	static void
189	i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
190	{
191	/* It's almost identical to FreeBSD a.out. */
192	i386fbsdaout_init_abi (info, gdbarch);
193
194	/* Except that it uses ELF. */
195	i386_elf_init_abi (info, gdbarch);
196	}
197
198	/* FreeBSD 4.0-RELEASE or later. */
199
200	/* From <machine/signal.h>. */
201	int i386fbsd4_sc_pc_offset = 76;
202
203	static void
204	i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
205	{
206	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
207
208	/* Inherit stuff from older releases. We assume that FreeBSD
209	4.0-RELEASE always uses ELF. */
210	i386fbsd_init_abi (info, gdbarch);
211
212	/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
213	tdep->sc_pc_offset = i386fbsd4_sc_pc_offset;
214	}
215
216	\f
217	static enum gdb_osabi
218	i386bsd_aout_osabi_sniffer (bfd *abfd)
219	{
220	if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
221	return GDB_OSABI_NETBSD_AOUT;
222
223	if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
224	return GDB_OSABI_FREEBSD_AOUT;
225
226	return GDB_OSABI_UNKNOWN;
227	}
228
229	\f
230	/* Provide a prototype to silence -Wmissing-prototypes. */
231	void _initialize_i386bsd_tdep (void);
232
233	void
234	_initialize_i386bsd_tdep (void)
235	{
236	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
237	i386bsd_aout_osabi_sniffer);
238
239	gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
240	i386nbsd_init_abi);
241	gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
242	i386nbsdelf_init_abi);
243	gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT,
244	i386fbsdaout_init_abi);
245	gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF,
246	i386fbsd4_init_abi);
247	}