[thirdparty/binutils-gdb.git] / gdb / ppcobsd-tdep.c

/* Target-dependent code for OpenBSD/powerpc.

   Copyright 2004, 2005 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 "arch-utils.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "trad-frame.h"
#include "tramp-frame.h"

#include "gdb_assert.h"
#include "gdb_string.h"

#include "ppc-tdep.h"
#include "ppcobsd-tdep.h"
#include "solib-svr4.h"

/* Register offsets from <machine/reg.h>.  */
struct ppc_reg_offsets ppcobsd_reg_offsets;
\f

/* Core file support.  */

/* Supply register REGNUM in the general-purpose register set REGSET
   from the buffer specified by GREGS and LEN to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

void
ppcobsd_supply_gregset (const struct regset *regset,
			struct regcache *regcache, int regnum,
			const void *gregs, size_t len)
{
  /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
     point registers.  Traditionally, GDB's register set has still
     listed the floating point registers for such machines, so this
     code is harmless.  However, the new E500 port actually omits the
     floating point registers entirely from the register set --- they
     don't even have register numbers assigned to them.

     It's not clear to me how best to update this code, so this assert
     will alert the first person to encounter the OpenBSD/E500
     combination to the problem.  */
  gdb_assert (ppc_floating_point_unit_p (current_gdbarch));

  ppc_supply_gregset (regset, regcache, regnum, gregs, len);
  ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
}

/* Collect register REGNUM in the general-purpose register set
   REGSET. from register cache REGCACHE into the buffer specified by
   GREGS and LEN.  If REGNUM is -1, do this for all registers in
   REGSET.  */

void
ppcobsd_collect_gregset (const struct regset *regset,
			 const struct regcache *regcache, int regnum,
			 void *gregs, size_t len)
{
  /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
     point registers.  Traditionally, GDB's register set has still
     listed the floating point registers for such machines, so this
     code is harmless.  However, the new E500 port actually omits the
     floating point registers entirely from the register set --- they
     don't even have register numbers assigned to them.

     It's not clear to me how best to update this code, so this assert
     will alert the first person to encounter the OpenBSD/E500
     combination to the problem.  */
  gdb_assert (ppc_floating_point_unit_p (current_gdbarch));

  ppc_collect_gregset (regset, regcache, regnum, gregs, len);
  ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
}

/* OpenBSD/powerpc register set.  */

struct regset ppcobsd_gregset =
{
  &ppcobsd_reg_offsets,
  ppcobsd_supply_gregset
};

/* Return the appropriate register set for the core section identified
   by SECT_NAME and SECT_SIZE.  */

static const struct regset *
ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
				  const char *sect_name, size_t sect_size)
{
  if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
    return &ppcobsd_gregset;

  return NULL;
}
\f

/* Signal trampolines.  */

static void
ppcobsd_sigtramp_cache_init (const struct tramp_frame *self,
			     struct frame_info *next_frame,
			     struct trad_frame_cache *this_cache,
			     CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (next_frame);
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  CORE_ADDR addr, base;
  int i;

  base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
  addr = base + 0x18 + 2 * tdep->wordsize;
  for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
    {
      int regnum = i + tdep->ppc_gp0_regnum;
      trad_frame_set_reg_addr (this_cache, regnum, addr);
    }
  trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */
  addr += tdep->wordsize;

  /* Construct the frame ID using the function start.  */
  trad_frame_set_id (this_cache, frame_id_build (base, func));
}

static const struct tramp_frame ppcobsd_sigtramp =
{
  SIGTRAMP_FRAME,
  4,
  {
    { 0x3821fff0, -1 },		/* add r1,r1,-16 */
    { 0x4e800021, -1 },		/* blrl */
    { 0x38610018, -1 },		/* addi r3,r1,24 */
    { 0x38000067, -1 },		/* li r0,103 */
    { 0x44000002, -1 },		/* sc */
    { 0x38000001, -1 },		/* li r0,1 */
    { 0x44000002, -1 },		/* sc */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  ppcobsd_sigtramp_cache_init
};
\f

static void
ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  /* OpenBSD uses SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

  set_gdbarch_regset_from_core_section
    (gdbarch, ppcobsd_regset_from_core_section);

  tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp);
}
\f

/* OpenBSD uses uses the traditional NetBSD core file format, even for
   ports that use ELF.  */
#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF

static enum gdb_osabi
ppcobsd_core_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
    return GDB_OSABI_NETBSD_CORE;

  return GDB_OSABI_UNKNOWN;
}
\f

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_ppcobsd_tdep (void);

void
_initialize_ppcobsd_tdep (void)
{
  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
  gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
                                  ppcobsd_core_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
			  ppcobsd_init_abi);
  gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
			  ppcobsd_init_abi);

  /* Avoid initializing the register offsets again if they were
     already initailized by ppcobsd-nat.c.  */
  if (ppcobsd_reg_offsets.pc_offset == 0)
    {
      /* General-purpose registers.  */
      ppcobsd_reg_offsets.r0_offset = 0;
      ppcobsd_reg_offsets.pc_offset = 384;
      ppcobsd_reg_offsets.ps_offset = 388;
      ppcobsd_reg_offsets.cr_offset = 392;
      ppcobsd_reg_offsets.lr_offset = 396;
      ppcobsd_reg_offsets.ctr_offset = 400;
      ppcobsd_reg_offsets.xer_offset = 404;
      ppcobsd_reg_offsets.mq_offset = 408;

      /* Floating-point registers.  */
      ppcobsd_reg_offsets.f0_offset = 128;
      ppcobsd_reg_offsets.fpscr_offset = -1;

      /* AltiVec registers.  */
      ppcobsd_reg_offsets.vr0_offset = 0;
      ppcobsd_reg_offsets.vscr_offset = 512;
      ppcobsd_reg_offsets.vrsave_offset = 520;
    }
}
Commit	Line	Data
d195bc9f MK	1	/* Target-dependent code for OpenBSD/powerpc.
d195bc9f MK	2
18b2ae85	3	Copyright 2004, 2005 Free Software Foundation, Inc.
d195bc9f MK	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	#include "defs.h"
	23	#include "arch-utils.h"
	24	#include "osabi.h"
	25	#include "regcache.h"
	26	#include "regset.h"
18b2ae85 MK	27	#include "trad-frame.h"
18b2ae85 MK	28	#include "tramp-frame.h"
d195bc9f	29
18b2ae85	30	#include "gdb_assert.h"
d195bc9f MK	31	#include "gdb_string.h"
	32
	33	#include "ppc-tdep.h"
	34	#include "ppcobsd-tdep.h"
	35	#include "solib-svr4.h"
	36
	37	/* Register offsets from <machine/reg.h>. */
	38	struct ppc_reg_offsets ppcobsd_reg_offsets;
	39	\f
	40
	41	/* Core file support. */
	42
	43	/* Supply register REGNUM in the general-purpose register set REGSET
	44	from the buffer specified by GREGS and LEN to register cache
	45	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	46
	47	void
	48	ppcobsd_supply_gregset (const struct regset *regset,
	49	struct regcache *regcache, int regnum,
	50	const void *gregs, size_t len)
	51	{
383f0f5b JB	52	/* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
	53	point registers. Traditionally, GDB's register set has still
	54	listed the floating point registers for such machines, so this
	55	code is harmless. However, the new E500 port actually omits the
	56	floating point registers entirely from the register set --- they
	57	don't even have register numbers assigned to them.
	58
	59	It's not clear to me how best to update this code, so this assert
	60	will alert the first person to encounter the OpenBSD/E500
	61	combination to the problem. */
	62	gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
	63
d195bc9f MK	64	ppc_supply_gregset (regset, regcache, regnum, gregs, len);
	65	ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
	66	}
	67
	68	/* Collect register REGNUM in the general-purpose register set
	69	REGSET. from register cache REGCACHE into the buffer specified by
	70	GREGS and LEN. If REGNUM is -1, do this for all registers in
	71	REGSET. */
	72
	73	void
	74	ppcobsd_collect_gregset (const struct regset *regset,
	75	const struct regcache *regcache, int regnum,
	76	void *gregs, size_t len)
	77	{
383f0f5b JB	78	/* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
	79	point registers. Traditionally, GDB's register set has still
	80	listed the floating point registers for such machines, so this
	81	code is harmless. However, the new E500 port actually omits the
	82	floating point registers entirely from the register set --- they
	83	don't even have register numbers assigned to them.
	84
	85	It's not clear to me how best to update this code, so this assert
	86	will alert the first person to encounter the OpenBSD/E500
	87	combination to the problem. */
	88	gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
	89
d195bc9f MK	90	ppc_collect_gregset (regset, regcache, regnum, gregs, len);
	91	ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
	92	}
	93
5d6210f0	94	/* OpenBSD/powerpc register set. */
d195bc9f MK	95
	96	struct regset ppcobsd_gregset =
	97	{
	98	&ppcobsd_reg_offsets,
	99	ppcobsd_supply_gregset
	100	};
	101
	102	/* Return the appropriate register set for the core section identified
	103	by SECT_NAME and SECT_SIZE. */
	104
	105	static const struct regset *
	106	ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
	107	const char *sect_name, size_t sect_size)
	108	{
	109	if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
	110	return &ppcobsd_gregset;
	111
	112	return NULL;
	113	}
	114	\f
	115
18b2ae85 MK	116	/* Signal trampolines. */
	117
	118	static void
	119	ppcobsd_sigtramp_cache_init (const struct tramp_frame *self,
	120	struct frame_info *next_frame,
	121	struct trad_frame_cache *this_cache,
	122	CORE_ADDR func)
	123	{
	124	struct gdbarch *gdbarch = get_frame_arch (next_frame);
	125	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	126	CORE_ADDR addr, base;
	127	int i;
	128
	129	base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
	130	addr = base + 0x18 + 2 * tdep->wordsize;
	131	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	132	{
	133	int regnum = i + tdep->ppc_gp0_regnum;
	134	trad_frame_set_reg_addr (this_cache, regnum, addr);
	135	}
	136	trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr);
	137	addr += tdep->wordsize;
	138	trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr);
	139	addr += tdep->wordsize;
	140	trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr);
	141	addr += tdep->wordsize;
	142	trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr);
	143	addr += tdep->wordsize;
	144	trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */
	145	addr += tdep->wordsize;
	146
	147	/* Construct the frame ID using the function start. */
	148	trad_frame_set_id (this_cache, frame_id_build (base, func));
	149	}
	150
	151	static const struct tramp_frame ppcobsd_sigtramp =
	152	{
	153	SIGTRAMP_FRAME,
	154	4,
	155	{
	156	{ 0x3821fff0, -1 }, /* add r1,r1,-16 */
	157	{ 0x4e800021, -1 }, /* blrl */
	158	{ 0x38610018, -1 }, /* addi r3,r1,24 */
	159	{ 0x38000067, -1 }, /* li r0,103 */
	160	{ 0x44000002, -1 }, /* sc */
	161	{ 0x38000001, -1 }, /* li r0,1 */
	162	{ 0x44000002, -1 }, /* sc */
	163	{ TRAMP_SENTINEL_INSN, -1 }
	164	},
	165	ppcobsd_sigtramp_cache_init
	166	};
18b2ae85	167	\f
5d6210f0	168
d195bc9f MK	169	static void
	170	ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	171	{
	172	/* OpenBSD uses SVR4-style shared libraries. */
d195bc9f MK	173	set_solib_svr4_fetch_link_map_offsets
	174	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	175
	176	set_gdbarch_regset_from_core_section
	177	(gdbarch, ppcobsd_regset_from_core_section);
18b2ae85 MK	178
18b2ae85 MK	179	tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp);
d195bc9f MK	180	}
	181	\f
	182
	183	/* OpenBSD uses uses the traditional NetBSD core file format, even for
	184	ports that use ELF. */
	185	#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
	186
	187	static enum gdb_osabi
	188	ppcobsd_core_osabi_sniffer (bfd *abfd)
	189	{
	190	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	191	return GDB_OSABI_NETBSD_CORE;
	192
	193	return GDB_OSABI_UNKNOWN;
	194	}
	195	\f
	196
	197	/* Provide a prototype to silence -Wmissing-prototypes. */
	198	void _initialize_ppcobsd_tdep (void);
	199
	200	void
	201	_initialize_ppcobsd_tdep (void)
	202	{
	203	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	204	gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
	205	ppcobsd_core_osabi_sniffer);
	206
5d6210f0 MK	207	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
5d6210f0 MK	208	ppcobsd_init_abi);
d195bc9f MK	209	gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
	210	ppcobsd_init_abi);
	211
	212	/* Avoid initializing the register offsets again if they were
	213	already initailized by ppcobsd-nat.c. */
	214	if (ppcobsd_reg_offsets.pc_offset == 0)
	215	{
	216	/* General-purpose registers. */
	217	ppcobsd_reg_offsets.r0_offset = 0;
	218	ppcobsd_reg_offsets.pc_offset = 384;
	219	ppcobsd_reg_offsets.ps_offset = 388;
	220	ppcobsd_reg_offsets.cr_offset = 392;
	221	ppcobsd_reg_offsets.lr_offset = 396;
	222	ppcobsd_reg_offsets.ctr_offset = 400;
	223	ppcobsd_reg_offsets.xer_offset = 404;
	224	ppcobsd_reg_offsets.mq_offset = 408;
	225
	226	/* Floating-point registers. */
	227	ppcobsd_reg_offsets.f0_offset = 128;
	228	ppcobsd_reg_offsets.fpscr_offset = -1;
	229
	230	/* AltiVec registers. */
	231	ppcobsd_reg_offsets.vr0_offset = 0;
	232	ppcobsd_reg_offsets.vscr_offset = 512;
	233	ppcobsd_reg_offsets.vrsave_offset = 520;
	234	}
	235	}