[deliverable/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 "floatformat.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 doesn't support the 128-bit `long double' from the psABI.  */
  set_gdbarch_long_double_bit (gdbarch, 64);
  set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);

  /* OpenBSD currently uses a broken GCC.  */
  set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);

  /* 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"
5a49dfd0	24	#include "floatformat.h"
d195bc9f MK	25	#include "osabi.h"
	26	#include "regcache.h"
	27	#include "regset.h"
18b2ae85 MK	28	#include "trad-frame.h"
18b2ae85 MK	29	#include "tramp-frame.h"
d195bc9f	30
18b2ae85	31	#include "gdb_assert.h"
d195bc9f MK	32	#include "gdb_string.h"
	33
	34	#include "ppc-tdep.h"
	35	#include "ppcobsd-tdep.h"
	36	#include "solib-svr4.h"
	37
	38	/* Register offsets from <machine/reg.h>. */
	39	struct ppc_reg_offsets ppcobsd_reg_offsets;
	40	\f
	41
	42	/* Core file support. */
	43
	44	/* Supply register REGNUM in the general-purpose register set REGSET
	45	from the buffer specified by GREGS and LEN to register cache
	46	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	47
	48	void
	49	ppcobsd_supply_gregset (const struct regset *regset,
	50	struct regcache *regcache, int regnum,
	51	const void *gregs, size_t len)
	52	{
383f0f5b JB	53	/* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
	54	point registers. Traditionally, GDB's register set has still
	55	listed the floating point registers for such machines, so this
	56	code is harmless. However, the new E500 port actually omits the
	57	floating point registers entirely from the register set --- they
	58	don't even have register numbers assigned to them.
	59
	60	It's not clear to me how best to update this code, so this assert
	61	will alert the first person to encounter the OpenBSD/E500
	62	combination to the problem. */
	63	gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
	64
d195bc9f MK	65	ppc_supply_gregset (regset, regcache, regnum, gregs, len);
	66	ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
	67	}
	68
	69	/* Collect register REGNUM in the general-purpose register set
	70	REGSET. from register cache REGCACHE into the buffer specified by
	71	GREGS and LEN. If REGNUM is -1, do this for all registers in
	72	REGSET. */
	73
	74	void
	75	ppcobsd_collect_gregset (const struct regset *regset,
	76	const struct regcache *regcache, int regnum,
	77	void *gregs, size_t len)
	78	{
383f0f5b JB	79	/* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
	80	point registers. Traditionally, GDB's register set has still
	81	listed the floating point registers for such machines, so this
	82	code is harmless. However, the new E500 port actually omits the
	83	floating point registers entirely from the register set --- they
	84	don't even have register numbers assigned to them.
	85
	86	It's not clear to me how best to update this code, so this assert
	87	will alert the first person to encounter the OpenBSD/E500
	88	combination to the problem. */
	89	gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
	90
d195bc9f MK	91	ppc_collect_gregset (regset, regcache, regnum, gregs, len);
	92	ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
	93	}
	94
5d6210f0	95	/* OpenBSD/powerpc register set. */
d195bc9f MK	96
	97	struct regset ppcobsd_gregset =
	98	{
	99	&ppcobsd_reg_offsets,
	100	ppcobsd_supply_gregset
	101	};
	102
	103	/* Return the appropriate register set for the core section identified
	104	by SECT_NAME and SECT_SIZE. */
	105
	106	static const struct regset *
	107	ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
	108	const char *sect_name, size_t sect_size)
	109	{
	110	if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
	111	return &ppcobsd_gregset;
	112
	113	return NULL;
	114	}
	115	\f
	116
18b2ae85 MK	117	/* Signal trampolines. */
	118
	119	static void
	120	ppcobsd_sigtramp_cache_init (const struct tramp_frame *self,
	121	struct frame_info *next_frame,
	122	struct trad_frame_cache *this_cache,
	123	CORE_ADDR func)
	124	{
	125	struct gdbarch *gdbarch = get_frame_arch (next_frame);
	126	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	127	CORE_ADDR addr, base;
	128	int i;
	129
	130	base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
	131	addr = base + 0x18 + 2 * tdep->wordsize;
	132	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	133	{
	134	int regnum = i + tdep->ppc_gp0_regnum;
	135	trad_frame_set_reg_addr (this_cache, regnum, addr);
	136	}
	137	trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr);
	138	addr += tdep->wordsize;
	139	trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr);
	140	addr += tdep->wordsize;
	141	trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr);
	142	addr += tdep->wordsize;
	143	trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr);
	144	addr += tdep->wordsize;
	145	trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */
	146	addr += tdep->wordsize;
	147
	148	/* Construct the frame ID using the function start. */
	149	trad_frame_set_id (this_cache, frame_id_build (base, func));
	150	}
	151
	152	static const struct tramp_frame ppcobsd_sigtramp =
	153	{
	154	SIGTRAMP_FRAME,
	155	4,
	156	{
	157	{ 0x3821fff0, -1 }, /* add r1,r1,-16 */
	158	{ 0x4e800021, -1 }, /* blrl */
	159	{ 0x38610018, -1 }, /* addi r3,r1,24 */
	160	{ 0x38000067, -1 }, /* li r0,103 */
	161	{ 0x44000002, -1 }, /* sc */
	162	{ 0x38000001, -1 }, /* li r0,1 */
	163	{ 0x44000002, -1 }, /* sc */
	164	{ TRAMP_SENTINEL_INSN, -1 }
	165	},
	166	ppcobsd_sigtramp_cache_init
	167	};
18b2ae85	168	\f
5d6210f0	169
d195bc9f MK	170	static void
	171	ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	172	{
5a49dfd0 MK	173	/* OpenBSD doesn't support the 128-bit `long double' from the psABI. */
	174	set_gdbarch_long_double_bit (gdbarch, 64);
	175	set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
	176
a86c5ab2 MK	177	/* OpenBSD currently uses a broken GCC. */
	178	set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
	179
d195bc9f	180	/* OpenBSD uses SVR4-style shared libraries. */
d195bc9f MK	181	set_solib_svr4_fetch_link_map_offsets
	182	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	183
	184	set_gdbarch_regset_from_core_section
	185	(gdbarch, ppcobsd_regset_from_core_section);
18b2ae85 MK	186
18b2ae85 MK	187	tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp);
d195bc9f MK	188	}
	189	\f
	190
	191	/* OpenBSD uses uses the traditional NetBSD core file format, even for
	192	ports that use ELF. */
	193	#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
	194
	195	static enum gdb_osabi
	196	ppcobsd_core_osabi_sniffer (bfd *abfd)
	197	{
	198	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	199	return GDB_OSABI_NETBSD_CORE;
	200
	201	return GDB_OSABI_UNKNOWN;
	202	}
	203	\f
	204
	205	/* Provide a prototype to silence -Wmissing-prototypes. */
	206	void _initialize_ppcobsd_tdep (void);
	207
	208	void
	209	_initialize_ppcobsd_tdep (void)
	210	{
	211	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	212	gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
	213	ppcobsd_core_osabi_sniffer);
	214
5d6210f0 MK	215	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
5d6210f0 MK	216	ppcobsd_init_abi);
d195bc9f MK	217	gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
	218	ppcobsd_init_abi);
	219
	220	/* Avoid initializing the register offsets again if they were
	221	already initailized by ppcobsd-nat.c. */
	222	if (ppcobsd_reg_offsets.pc_offset == 0)
	223	{
	224	/* General-purpose registers. */
	225	ppcobsd_reg_offsets.r0_offset = 0;
	226	ppcobsd_reg_offsets.pc_offset = 384;
	227	ppcobsd_reg_offsets.ps_offset = 388;
	228	ppcobsd_reg_offsets.cr_offset = 392;
	229	ppcobsd_reg_offsets.lr_offset = 396;
	230	ppcobsd_reg_offsets.ctr_offset = 400;
	231	ppcobsd_reg_offsets.xer_offset = 404;
	232	ppcobsd_reg_offsets.mq_offset = 408;
	233
	234	/* Floating-point registers. */
	235	ppcobsd_reg_offsets.f0_offset = 128;
	236	ppcobsd_reg_offsets.fpscr_offset = -1;
	237
	238	/* AltiVec registers. */
	239	ppcobsd_reg_offsets.vr0_offset = 0;
	240	ppcobsd_reg_offsets.vscr_offset = 512;
	241	ppcobsd_reg_offsets.vrsave_offset = 520;
	242	}
	243	}