[deliverable/binutils-gdb.git] / gdb / ppc-fbsd-tdep.c

/* Target-dependent code for PowerPC systems running FreeBSD.

   Copyright (C) 2013-2020 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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "frame-unwind.h"
#include "gdbtypes.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "symtab.h"
#include "target.h"
#include "trad-frame.h"

#include "ppc-tdep.h"
#include "ppc64-tdep.h"
#include "ppc-fbsd-tdep.h"
#include "fbsd-tdep.h"
#include "solib-svr4.h"


/* 32-bit regset descriptions.  */

static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
  {
	/* General-purpose registers.  */
	/* .r0_offset = */     0,
	/* .gpr_size = */      4,
	/* .xr_size = */       4,
	/* .pc_offset = */     144,
	/* .ps_offset = */     -1,
	/* .cr_offset = */     132,
	/* .lr_offset = */     128,
	/* .ctr_offset = */    140,
	/* .xer_offset = */    136,
	/* .mq_offset = */     -1,

	/* Floating-point registers.  */
	/* .f0_offset = */     0,
	/* .fpscr_offset = */  256,
	/* .fpscr_size = */    8
  };

/* 64-bit regset descriptions.  */

static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
  {
	/* General-purpose registers.  */
	/* .r0_offset = */     0,
	/* .gpr_size = */      8,
	/* .xr_size = */       8,
	/* .pc_offset = */     288,
	/* .ps_offset = */     -1,
	/* .cr_offset = */     264,
	/* .lr_offset = */     256,
	/* .ctr_offset = */    280,
	/* .xer_offset = */    272,
	/* .mq_offset = */     -1,

	/* Floating-point registers.  */
	/* .f0_offset = */     0,
	/* .fpscr_offset = */  256,
	/* .fpscr_size = */    8
  };

/* 32-bit general-purpose register set.  */

static const struct regset ppc32_fbsd_gregset = {
  &ppc32_fbsd_reg_offsets,
  ppc_supply_gregset,
  ppc_collect_gregset
};

/* 64-bit general-purpose register set.  */

static const struct regset ppc64_fbsd_gregset = {
  &ppc64_fbsd_reg_offsets,
  ppc_supply_gregset,
  ppc_collect_gregset
};

/* 32-/64-bit floating-point register set.  */

static const struct regset ppc32_fbsd_fpregset = {
  &ppc32_fbsd_reg_offsets,
  ppc_supply_fpregset,
  ppc_collect_fpregset
};

const struct regset *
ppc_fbsd_gregset (int wordsize)
{
  return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
}

const struct regset *
ppc_fbsd_fpregset (void)
{
  return &ppc32_fbsd_fpregset;
}

/* Iterate over core file register note sections.  */

static void
ppcfbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
				      iterate_over_regset_sections_cb *cb,
				      void *cb_data,
				      const struct regcache *regcache)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  if (tdep->wordsize == 4)
    cb (".reg", 148, 148, &ppc32_fbsd_gregset, NULL, cb_data);
  else
    cb (".reg", 296, 296, &ppc64_fbsd_gregset, NULL, cb_data);
  cb (".reg2", 264, 264, &ppc32_fbsd_fpregset, NULL, cb_data);
}

/* Default page size.  */

static const int ppcfbsd_page_size = 4096;

/* Offset for sigreturn(2).  */

static const int ppcfbsd_sigreturn_offset[] = {
  0xc,				/* FreeBSD 32-bit  */
  -1
};

/* Signal trampolines.  */

static int
ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
				struct frame_info *this_frame,
				void **this_cache)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR pc = get_frame_pc (this_frame);
  CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
  const int *offset;
  const char *name;

  /* A stack trampoline is detected if no name is associated
   to the current pc and if it points inside a trampoline
   sequence.  */

  find_pc_partial_function (pc, &name, NULL, NULL);

  /* If we have a name, we have no trampoline, return.  */
  if (name)
    return 0;

  for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
    {
      gdb_byte buf[2 * PPC_INSN_SIZE];
      unsigned long insn;

      if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
				     buf, sizeof buf))
	continue;

      /* Check for "li r0,SYS_sigreturn".  */
      insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
      if (insn != 0x380001a1)
	continue;

      /* Check for "sc".  */
      insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
				       PPC_INSN_SIZE, byte_order);
      if (insn != 0x44000002)
	continue;

      return 1;
    }

  return 0;
}

static struct trad_frame_cache *
ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  struct trad_frame_cache *cache;
  CORE_ADDR addr, base, func;
  gdb_byte buf[PPC_INSN_SIZE];
  int i;

  if (*this_cache)
    return (struct trad_frame_cache *) *this_cache;

  cache = trad_frame_cache_zalloc (this_frame);
  *this_cache = cache;

  func = get_frame_pc (this_frame);
  func &= ~(ppcfbsd_page_size - 1);
  if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
    return cache;

  base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
  addr = base + 0x10 + 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 (cache, regnum, addr);
    }
  trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
  addr += tdep->wordsize;
  trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
  /* SRR0?  */
  addr += tdep->wordsize;

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

  return cache;
}

static void
ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
				void **this_cache, struct frame_id *this_id)
{
  struct trad_frame_cache *cache =
    ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);

  trad_frame_get_id (cache, this_id);
}

static struct value *
ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
				      void **this_cache, int regnum)
{
  struct trad_frame_cache *cache =
    ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);

  return trad_frame_get_register (cache, this_frame, regnum);
}

static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
  SIGTRAMP_FRAME,
  default_frame_unwind_stop_reason,
  ppcfbsd_sigtramp_frame_this_id,
  ppcfbsd_sigtramp_frame_prev_register,
  NULL,
  ppcfbsd_sigtramp_frame_sniffer
};

static enum return_value_convention
ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
		      struct type *valtype, struct regcache *regcache,
		      gdb_byte *readbuf, const gdb_byte *writebuf)
{
  return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
					   regcache, readbuf, writebuf);
}

/* Implement the "get_thread_local_address" gdbarch method.  */

static CORE_ADDR
ppcfbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
				  CORE_ADDR lm_addr, CORE_ADDR offset)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  struct regcache *regcache;
  int tp_offset, tp_regnum;

  regcache = get_thread_arch_regcache (ptid, gdbarch);

  if (tdep->wordsize == 4)
    {
      tp_offset = 0x7008;
      tp_regnum = PPC_R0_REGNUM + 2;
    }
  else
    {
      tp_offset = 0x7010;
      tp_regnum = PPC_R0_REGNUM + 13;
    }
  target_fetch_registers (regcache, tp_regnum);

  ULONGEST tp;
  if (regcache->cooked_read (tp_regnum, &tp) != REG_VALID)
    error (_("Unable to fetch tcb pointer"));

  /* tp points to the end of the TCB block.  The first member of the
     TCB is the pointer to the DTV array.  */
  CORE_ADDR dtv_addr = tp - tp_offset;
  return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
}

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

  /* Generic FreeBSD support. */
  fbsd_init_abi (info, gdbarch);

  /* FreeBSD doesn't support the 128-bit `long double' from the psABI.  */
  set_gdbarch_long_double_bit (gdbarch, 64);
  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);

  if (tdep->wordsize == 4)
    {
      set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);

      set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
      set_solib_svr4_fetch_link_map_offsets (gdbarch,
					     svr4_ilp32_fetch_link_map_offsets);

      frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
      set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
    }

  if (tdep->wordsize == 8)
    {
      set_gdbarch_convert_from_func_ptr_addr
	(gdbarch, ppc64_convert_from_func_ptr_addr);
      set_gdbarch_elf_make_msymbol_special (gdbarch,
					    ppc64_elf_make_msymbol_special);

      set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
      set_solib_svr4_fetch_link_map_offsets (gdbarch,
					     svr4_lp64_fetch_link_map_offsets);
      set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
    }

  set_gdbarch_iterate_over_regset_sections
    (gdbarch, ppcfbsd_iterate_over_regset_sections);

  set_gdbarch_fetch_tls_load_module_address (gdbarch,
					     svr4_fetch_objfile_link_map);
  set_gdbarch_get_thread_local_address (gdbarch,
					ppcfbsd_get_thread_local_address);
}

void
_initialize_ppcfbsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD,
			  ppcfbsd_init_abi);
  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_FREEBSD,
			  ppcfbsd_init_abi);
  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD,
			  ppcfbsd_init_abi);
}
Commit	Line	Data
dc18f110 AT	1	/* Target-dependent code for PowerPC systems running FreeBSD.
dc18f110 AT	2
b811d2c2	3	Copyright (C) 2013-2020 Free Software Foundation, Inc.
dc18f110 AT	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 3 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, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21	#include "arch-utils.h"
	22	#include "frame.h"
	23	#include "gdbcore.h"
	24	#include "frame-unwind.h"
	25	#include "gdbtypes.h"
	26	#include "osabi.h"
	27	#include "regcache.h"
	28	#include "regset.h"
	29	#include "symtab.h"
	30	#include "target.h"
	31	#include "trad-frame.h"
	32
dc18f110 AT	33	#include "ppc-tdep.h"
dc18f110 AT	34	#include "ppc64-tdep.h"
03b62bbb	35	#include "ppc-fbsd-tdep.h"
23ea9aeb	36	#include "fbsd-tdep.h"
dc18f110 AT	37	#include "solib-svr4.h"
	38
	39
	40	/* 32-bit regset descriptions. */
	41
	42	static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
	43	{
	44	/* General-purpose registers. */
	45	/* .r0_offset = */ 0,
	46	/* .gpr_size = */ 4,
	47	/* .xr_size = */ 4,
	48	/* .pc_offset = */ 144,
	49	/* .ps_offset = */ -1,
	50	/* .cr_offset = */ 132,
	51	/* .lr_offset = */ 128,
	52	/* .ctr_offset = */ 140,
	53	/* .xer_offset = */ 136,
	54	/* .mq_offset = */ -1,
	55
	56	/* Floating-point registers. */
	57	/* .f0_offset = */ 0,
	58	/* .fpscr_offset = */ 256,
1d75a658	59	/* .fpscr_size = */ 8
dc18f110 AT	60	};
	61
	62	/* 64-bit regset descriptions. */
	63
	64	static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
	65	{
	66	/* General-purpose registers. */
	67	/* .r0_offset = */ 0,
	68	/* .gpr_size = */ 8,
	69	/* .xr_size = */ 8,
	70	/* .pc_offset = */ 288,
	71	/* .ps_offset = */ -1,
	72	/* .cr_offset = */ 264,
	73	/* .lr_offset = */ 256,
	74	/* .ctr_offset = */ 280,
	75	/* .xer_offset = */ 272,
	76	/* .mq_offset = */ -1,
	77
	78	/* Floating-point registers. */
	79	/* .f0_offset = */ 0,
	80	/* .fpscr_offset = */ 256,
1d75a658	81	/* .fpscr_size = */ 8
dc18f110 AT	82	};
	83
	84	/* 32-bit general-purpose register set. */
	85
	86	static const struct regset ppc32_fbsd_gregset = {
	87	&ppc32_fbsd_reg_offsets,
	88	ppc_supply_gregset,
09424cff	89	ppc_collect_gregset
dc18f110 AT	90	};
	91
	92	/* 64-bit general-purpose register set. */
	93
	94	static const struct regset ppc64_fbsd_gregset = {
	95	&ppc64_fbsd_reg_offsets,
	96	ppc_supply_gregset,
09424cff	97	ppc_collect_gregset
dc18f110 AT	98	};
	99
	100	/* 32-/64-bit floating-point register set. */
	101
3ca7dae4	102	static const struct regset ppc32_fbsd_fpregset = {
dc18f110 AT	103	&ppc32_fbsd_reg_offsets,
	104	ppc_supply_fpregset,
	105	ppc_collect_fpregset
	106	};
	107
	108	const struct regset *
	109	ppc_fbsd_gregset (int wordsize)
	110	{
	111	return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
	112	}
	113
	114	const struct regset *
	115	ppc_fbsd_fpregset (void)
	116	{
	117	return &ppc32_fbsd_fpregset;
	118	}
	119
23ea9aeb	120	/* Iterate over core file register note sections. */
dc18f110	121
23ea9aeb AA	122	static void
	123	ppcfbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
	124	iterate_over_regset_sections_cb *cb,
	125	void *cb_data,
	126	const struct regcache *regcache)
dc18f110 AT	127	{
dc18f110 AT	128	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
23ea9aeb AA	129
23ea9aeb AA	130	if (tdep->wordsize == 4)
a616bb94	131	cb (".reg", 148, 148, &ppc32_fbsd_gregset, NULL, cb_data);
23ea9aeb	132	else
a616bb94 AH	133	cb (".reg", 296, 296, &ppc64_fbsd_gregset, NULL, cb_data);
a616bb94 AH	134	cb (".reg2", 264, 264, &ppc32_fbsd_fpregset, NULL, cb_data);
dc18f110 AT	135	}
	136
	137	/* Default page size. */
	138
	139	static const int ppcfbsd_page_size = 4096;
	140
	141	/* Offset for sigreturn(2). */
	142
	143	static const int ppcfbsd_sigreturn_offset[] = {
	144	0xc, /* FreeBSD 32-bit */
	145	-1
	146	};
	147
	148	/* Signal trampolines. */
	149
	150	static int
	151	ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
	152	struct frame_info *this_frame,
	153	void **this_cache)
	154	{
	155	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	156	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	157	CORE_ADDR pc = get_frame_pc (this_frame);
	158	CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
	159	const int *offset;
	160	const char *name;
	161
	162	/* A stack trampoline is detected if no name is associated
	163	to the current pc and if it points inside a trampoline
	164	sequence. */
	165
	166	find_pc_partial_function (pc, &name, NULL, NULL);
	167
	168	/* If we have a name, we have no trampoline, return. */
	169	if (name)
	170	return 0;
	171
	172	for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
	173	{
	174	gdb_byte buf[2 * PPC_INSN_SIZE];
	175	unsigned long insn;
	176
	177	if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
	178	buf, sizeof buf))
	179	continue;
	180
	181	/* Check for "li r0,SYS_sigreturn". */
	182	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
	183	if (insn != 0x380001a1)
	184	continue;
	185
	186	/* Check for "sc". */
	187	insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
	188	PPC_INSN_SIZE, byte_order);
	189	if (insn != 0x44000002)
	190	continue;
	191
	192	return 1;
	193	}
	194
	195	return 0;
	196	}
	197
	198	static struct trad_frame_cache *
199	ppcfbsd_sigtramp_frame_cache (struct frame_info this_frame, void *this_cache)
200	{
201	struct gdbarch *gdbarch = get_frame_arch (this_frame);
202	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
dc18f110 AT	203	struct trad_frame_cache *cache;
	204	CORE_ADDR addr, base, func;
	205	gdb_byte buf[PPC_INSN_SIZE];
	206	int i;
	207
	208	if (*this_cache)
19ba03f4	209	return (struct trad_frame_cache ) this_cache;
dc18f110 AT	210
	211	cache = trad_frame_cache_zalloc (this_frame);
	212	*this_cache = cache;
	213
	214	func = get_frame_pc (this_frame);
	215	func &= ~(ppcfbsd_page_size - 1);
	216	if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
	217	return cache;
	218
	219	base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
	220	addr = base + 0x10 + 2 * tdep->wordsize;
	221	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	222	{
	223	int regnum = i + tdep->ppc_gp0_regnum;
	224	trad_frame_set_reg_addr (cache, regnum, addr);
	225	}
	226	trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
	227	addr += tdep->wordsize;
	228	trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
	229	addr += tdep->wordsize;
	230	trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
	231	addr += tdep->wordsize;
	232	trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
	233	addr += tdep->wordsize;
	234	trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
	235	/* SRR0? */
	236	addr += tdep->wordsize;
	237
	238	/* Construct the frame ID using the function start. */
	239	trad_frame_set_id (cache, frame_id_build (base, func));
	240
	241	return cache;
	242	}
	243
	244	static void
	245	ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
	246	void *this_cache, struct frame_id this_id)
	247	{
	248	struct trad_frame_cache *cache =
	249	ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
	250
	251	trad_frame_get_id (cache, this_id);
	252	}
	253
	254	static struct value *
	255	ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
	256	void **this_cache, int regnum)
	257	{
	258	struct trad_frame_cache *cache =
	259	ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
	260
	261	return trad_frame_get_register (cache, this_frame, regnum);
	262	}
	263
	264	static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
	265	SIGTRAMP_FRAME,
	266	default_frame_unwind_stop_reason,
	267	ppcfbsd_sigtramp_frame_this_id,
	268	ppcfbsd_sigtramp_frame_prev_register,
	269	NULL,
	270	ppcfbsd_sigtramp_frame_sniffer
	271	};
	272
	273	static enum return_value_convention
274	ppcfbsd_return_value (struct gdbarch gdbarch, struct value function,
275	struct type valtype, struct regcache regcache,
276	gdb_byte readbuf, const gdb_byte writebuf)
277	{
278	return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
279	regcache, readbuf, writebuf);
280	}
281
8399425f JB	282	/* Implement the "get_thread_local_address" gdbarch method. */
	283
	284	static CORE_ADDR
	285	ppcfbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
	286	CORE_ADDR lm_addr, CORE_ADDR offset)
	287	{
	288	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	289	struct regcache *regcache;
	290	int tp_offset, tp_regnum;
	291
	292	regcache = get_thread_arch_regcache (ptid, gdbarch);
	293
	294	if (tdep->wordsize == 4)
	295	{
	296	tp_offset = 0x7008;
	297	tp_regnum = PPC_R0_REGNUM + 2;
	298	}
	299	else
	300	{
	301	tp_offset = 0x7010;
	302	tp_regnum = PPC_R0_REGNUM + 13;
	303	}
	304	target_fetch_registers (regcache, tp_regnum);
	305
	306	ULONGEST tp;
	307	if (regcache->cooked_read (tp_regnum, &tp) != REG_VALID)
	308	error (_("Unable to fetch tcb pointer"));
	309
	310	/* tp points to the end of the TCB block. The first member of the
	311	TCB is the pointer to the DTV array. */
	312	CORE_ADDR dtv_addr = tp - tp_offset;
	313	return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
	314	}
dc18f110 AT	315
	316	static void
	317	ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	318	{
	319	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	320
23ea9aeb AA	321	/* Generic FreeBSD support. */
	322	fbsd_init_abi (info, gdbarch);
	323
dc18f110 AT	324	/* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
	325	set_gdbarch_long_double_bit (gdbarch, 64);
	326	set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
	327
	328	if (tdep->wordsize == 4)
	329	{
	330	set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);
	331
	332	set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
	333	set_solib_svr4_fetch_link_map_offsets (gdbarch,
	334	svr4_ilp32_fetch_link_map_offsets);
	335
	336	frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
	337	set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
	338	}
	339
	340	if (tdep->wordsize == 8)
	341	{
	342	set_gdbarch_convert_from_func_ptr_addr
	343	(gdbarch, ppc64_convert_from_func_ptr_addr);
24c274a1 AM	344	set_gdbarch_elf_make_msymbol_special (gdbarch,
	345	ppc64_elf_make_msymbol_special);
	346
dc18f110 AT	347	set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
	348	set_solib_svr4_fetch_link_map_offsets (gdbarch,
	349	svr4_lp64_fetch_link_map_offsets);
	350	set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
	351	}
	352
23ea9aeb AA	353	set_gdbarch_iterate_over_regset_sections
23ea9aeb AA	354	(gdbarch, ppcfbsd_iterate_over_regset_sections);
dc18f110 AT	355
	356	set_gdbarch_fetch_tls_load_module_address (gdbarch,
	357	svr4_fetch_objfile_link_map);
8399425f JB	358	set_gdbarch_get_thread_local_address (gdbarch,
8399425f JB	359	ppcfbsd_get_thread_local_address);
dc18f110 AT	360	}
dc18f110 AT	361
dc18f110 AT	362	void
	363	_initialize_ppcfbsd_tdep (void)
	364	{
1736a7bd	365	gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD,
dc18f110	366	ppcfbsd_init_abi);
1736a7bd	367	gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_FREEBSD,
dc18f110	368	ppcfbsd_init_abi);
1736a7bd	369	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD,
dc18f110 AT	370	ppcfbsd_init_abi);
dc18f110 AT	371	}