[binutils.git] / gdb / sparc64obsd-tdep.c

/* Target-dependent code for OpenBSD/sparc64.

   Copyright (C) 2004, 2005, 2006, 2007 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 "frame.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "symtab.h"
#include "objfiles.h"
#include "trad-frame.h"

#include "gdb_assert.h"

#include "obsd-tdep.h"
#include "sparc64-tdep.h"
#include "solib-svr4.h"
#include "bsd-uthread.h"

/* OpenBSD uses the traditional NetBSD core file format, even for
   ports that use ELF.  The core files don't use multiple register
   sets.  Instead, the general-purpose and floating-point registers
   are lumped together in a single section.  Unlike on NetBSD, OpenBSD
   uses a different layout for its general-purpose registers than the
   layout used for ptrace(2).  */

/* From <machine/reg.h>.  */
const struct sparc_gregset sparc64obsd_core_gregset =
{
  0 * 8,			/* "tstate" */
  1 * 8,			/* %pc */
  2 * 8,			/* %npc */
  3 * 8,			/* %y */
  -1,				/* %fprs */
  -1,
  7 * 8,			/* %g1 */
  22 * 8,			/* %l0 */
  4				/* sizeof (%y) */
};

static void
sparc64obsd_supply_gregset (const struct regset *regset,
			    struct regcache *regcache,
			    int regnum, const void *gregs, size_t len)
{
  const char *regs = gregs;

  sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, regs);
  sparc64_supply_fpregset (regcache, regnum, regs + 288);
}
\f

/* Signal trampolines.  */

/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
   in virtual memory.  The randomness makes it somewhat tricky to
   detect it, but fortunately we can rely on the fact that the start
   of the sigtramp routine is page-aligned.  We recognize the
   trampoline by looking for the code that invokes the sigreturn
   system call.  The offset where we can find that code varies from
   release to release.

   By the way, the mapping mentioned above is read-only, so you cannot
   place a breakpoint in the signal trampoline.  */

/* Default page size.  */
static const int sparc64obsd_page_size = 8192;

/* Offset for sigreturn(2).  */
static const int sparc64obsd_sigreturn_offset[] = {
  0xf0,				/* OpenBSD 3.8 */
  0xec,				/* OpenBSD 3.6 */
  0xe8,				/* OpenBSD 3.2 */
  -1
};

static int
sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
  CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
  unsigned long insn;
  const int *offset;

  if (name)
    return 0;

  for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
    {
      /* Check for "restore %g0, SYS_sigreturn, %g1".  */
      insn = sparc_fetch_instruction (start_pc + *offset);
      if (insn != 0x83e82067)
	continue;

      /* Check for "t ST_SYSCALL".  */
      insn = sparc_fetch_instruction (start_pc + *offset + 8);
      if (insn != 0x91d02000)
	continue;

      return 1;
    }

  return 0;
}

static struct sparc_frame_cache *
sparc64obsd_frame_cache (struct frame_info *next_frame, void **this_cache)
{
  struct sparc_frame_cache *cache;
  CORE_ADDR addr;

  if (*this_cache)
    return *this_cache;

  cache = sparc_frame_cache (next_frame, this_cache);
  gdb_assert (cache == *this_cache);

  /* If we couldn't find the frame's function, we're probably dealing
     with an on-stack signal trampoline.  */
  if (cache->pc == 0)
    {
      cache->pc = frame_pc_unwind (next_frame);
      cache->pc &= ~(sparc64obsd_page_size - 1);

      /* Since we couldn't find the frame's function, the cache was
         initialized under the assumption that we're frameless.  */
      cache->frameless_p = 0;
      addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
      if (addr & 1)
	addr += BIAS;
      cache->base = addr;
    }

  /* We find the appropriate instance of `struct sigcontext' at a
     fixed offset in the signal frame.  */
  addr = cache->base + 128 + 16;
  cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);

  return cache;
}

static void
sparc64obsd_frame_this_id (struct frame_info *next_frame, void **this_cache,
			   struct frame_id *this_id)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_frame_cache (next_frame, this_cache);

  (*this_id) = frame_id_build (cache->base, cache->pc);
}

static void
sparc64obsd_frame_prev_register (struct frame_info *next_frame,
				 void **this_cache,
				 int regnum, int *optimizedp,
				 enum lval_type *lvalp, CORE_ADDR *addrp,
				 int *realnump, gdb_byte *valuep)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_frame_cache (next_frame, this_cache);

  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
				optimizedp, lvalp, addrp, realnump, valuep);
}

static const struct frame_unwind sparc64obsd_frame_unwind =
{
  SIGTRAMP_FRAME,
  sparc64obsd_frame_this_id,
  sparc64obsd_frame_prev_register
};

static const struct frame_unwind *
sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
  CORE_ADDR pc = frame_pc_unwind (next_frame);
  char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);
  if (sparc64obsd_pc_in_sigtramp (pc, name))
    return &sparc64obsd_frame_unwind;

  return NULL;
}
\f
/* Kernel debugging support.  */

static struct sparc_frame_cache *
sparc64obsd_trapframe_cache (struct frame_info *next_frame, void **this_cache)
{
  struct sparc_frame_cache *cache;
  CORE_ADDR sp, trapframe_addr;
  int regnum;

  if (*this_cache)
    return *this_cache;

  cache = sparc_frame_cache (next_frame, this_cache);
  gdb_assert (cache == *this_cache);

  sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
  trapframe_addr = sp + BIAS + 176;

  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);

  cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
  cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
  cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;

  for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
    cache->saved_regs[regnum].addr =
      trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;

  return cache;
}

static void
sparc64obsd_trapframe_this_id (struct frame_info *next_frame,
			       void **this_cache, struct frame_id *this_id)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (next_frame, this_cache);

  (*this_id) = frame_id_build (cache->base, cache->pc);
}

static void
sparc64obsd_trapframe_prev_register (struct frame_info *next_frame,
				     void **this_cache,
				     int regnum, int *optimizedp,
				     enum lval_type *lvalp, CORE_ADDR *addrp,
				     int *realnump, gdb_byte *valuep)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (next_frame, this_cache);

  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
				optimizedp, lvalp, addrp, realnump, valuep);
}

static const struct frame_unwind sparc64obsd_trapframe_unwind =
{
  NORMAL_FRAME,
  sparc64obsd_trapframe_this_id,
  sparc64obsd_trapframe_prev_register
};

static const struct frame_unwind *
sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
{
  CORE_ADDR pc;
  ULONGEST pstate;
  char *name;

  /* Check whether we are in privileged mode, and bail out if we're not.  */
  pstate = frame_unwind_register_unsigned (next_frame, SPARC64_PSTATE_REGNUM);
  if ((pstate & SPARC64_PSTATE_PRIV) == 0)
    return NULL;

  pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
  find_pc_partial_function (pc, &name, NULL, NULL);
  if (name && strcmp (name, "Lslowtrap_reenter") == 0)
    return &sparc64obsd_trapframe_unwind;

  return NULL;
}
\f

/* Threads support.  */

/* Offset wthin the thread structure where we can find %fp and %i7.  */
#define SPARC64OBSD_UTHREAD_FP_OFFSET	232
#define SPARC64OBSD_UTHREAD_PC_OFFSET	240

static void
sparc64obsd_supply_uthread (struct regcache *regcache,
			    int regnum, CORE_ADDR addr)
{
  CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
  gdb_byte buf[8];

  gdb_assert (regnum >= -1);

  fp = read_memory_unsigned_integer (fp_addr, 8);
  if (regnum == SPARC_SP_REGNUM || regnum == -1)
    {
      store_unsigned_integer (buf, 8, fp);
      regcache_raw_supply (regcache, SPARC_SP_REGNUM, buf);

      if (regnum == SPARC_SP_REGNUM)
	return;
    }

  if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM
      || regnum == -1)
    {
      CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;

      i7 = read_memory_unsigned_integer (i7_addr, 8);
      if (regnum == SPARC64_PC_REGNUM || regnum == -1)
	{
	  store_unsigned_integer (buf, 8, i7 + 8);
	  regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
	}
      if (regnum == SPARC64_NPC_REGNUM || regnum == -1)
	{
	  store_unsigned_integer (buf, 8, i7 + 12);
	  regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, buf);
	}

      if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM)
	return;
    }

  sparc_supply_rwindow (regcache, fp, regnum);
}

static void
sparc64obsd_collect_uthread(const struct regcache *regcache,
			    int regnum, CORE_ADDR addr)
{
  CORE_ADDR sp;
  gdb_byte buf[8];

  gdb_assert (regnum >= -1);

  if (regnum == SPARC_SP_REGNUM || regnum == -1)
    {
      CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;

      regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
      write_memory (fp_addr,buf, 8);
    }

  if (regnum == SPARC64_PC_REGNUM || regnum == -1)
    {
      CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;

      regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
      i7 = extract_unsigned_integer (buf, 8) - 8;
      write_memory_unsigned_integer (i7_addr, 8, i7);

      if (regnum == SPARC64_PC_REGNUM)
	return;
    }

  regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
  sp = extract_unsigned_integer (buf, 8);
  sparc_collect_rwindow (regcache, sp, regnum);
}
\f

static void
sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
  tdep->sizeof_gregset = 832;

  /* Make sure we can single-step "new" syscalls.  */
  tdep->step_trap = sparcnbsd_step_trap;

  frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer);
  frame_unwind_append_sniffer (gdbarch, sparc64obsd_trapframe_sniffer);

  sparc64_init_abi (info, gdbarch);

  /* OpenBSD/sparc64 has SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_lp64_fetch_link_map_offsets);
  set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);

  /* OpenBSD provides a user-level threads implementation.  */
  bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
  bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
}
\f

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_sparc64obsd_tdep (void);

void
_initialize_sparc64obsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
			  GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi);
}
Commit	Line	Data
1e067c66 MK	1	/* Target-dependent code for OpenBSD/sparc64.
1e067c66 MK	2
6aba47ca	3	Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
1e067c66 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
a9762ec7	9	the Free Software Foundation; either version 3 of the License, or
1e067c66 MK	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
a9762ec7	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
1e067c66 MK	19
	20	#include "defs.h"
	21	#include "frame.h"
	22	#include "frame-unwind.h"
585e38ed	23	#include "gdbcore.h"
1e067c66	24	#include "osabi.h"
585e38ed	25	#include "regcache.h"
1e067c66 MK	26	#include "regset.h"
1e067c66 MK	27	#include "symtab.h"
3510d1f2	28	#include "objfiles.h"
1e067c66 MK	29	#include "trad-frame.h"
	30
	31	#include "gdb_assert.h"
	32
4807909c	33	#include "obsd-tdep.h"
1e067c66	34	#include "sparc64-tdep.h"
585e38ed MK	35	#include "solib-svr4.h"
585e38ed MK	36	#include "bsd-uthread.h"
1e067c66 MK	37
	38	/* OpenBSD uses the traditional NetBSD core file format, even for
	39	ports that use ELF. The core files don't use multiple register
	40	sets. Instead, the general-purpose and floating-point registers
	41	are lumped together in a single section. Unlike on NetBSD, OpenBSD
	42	uses a different layout for its general-purpose registers than the
	43	layout used for ptrace(2). */
	44
	45	/* From <machine/reg.h>. */
	46	const struct sparc_gregset sparc64obsd_core_gregset =
	47	{
	48	0 * 8, /* "tstate" */
	49	1 * 8, /* %pc */
	50	2 * 8, /* %npc */
	51	3 * 8, /* %y */
	52	-1, /* %fprs */
	53	-1,
	54	7 * 8, /* %g1 */
	55	22 * 8, /* %l0 */
	56	4 /* sizeof (%y) */
	57	};
	58
	59	static void
	60	sparc64obsd_supply_gregset (const struct regset *regset,
	61	struct regcache *regcache,
	62	int regnum, const void *gregs, size_t len)
	63	{
	64	const char *regs = gregs;
	65
9ea75c57	66	sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, regs);
1e067c66 MK	67	sparc64_supply_fpregset (regcache, regnum, regs + 288);
	68	}
	69	\f
	70
	71	/* Signal trampolines. */
	72
47b4f830 MK	73	/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
	74	in virtual memory. The randomness makes it somewhat tricky to
	75	detect it, but fortunately we can rely on the fact that the start
	76	of the sigtramp routine is page-aligned. We recognize the
	77	trampoline by looking for the code that invokes the sigreturn
	78	system call. The offset where we can find that code varies from
	79	release to release.
	80
	81	By the way, the mapping mentioned above is read-only, so you cannot
	82	place a breakpoint in the signal trampoline. */
	83
	84	/* Default page size. */
1e067c66	85	static const int sparc64obsd_page_size = 8192;
47b4f830 MK	86
	87	/* Offset for sigreturn(2). */
	88	static const int sparc64obsd_sigreturn_offset[] = {
	89	0xf0, /* OpenBSD 3.8 */
	90	0xec, /* OpenBSD 3.6 */
	91	0xe8, /* OpenBSD 3.2 */
	92	-1
	93	};
1e067c66 MK	94
	95	static int
	96	sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
	97	{
	98	CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
	99	unsigned long insn;
dc856692	100	const int *offset;
1e067c66 MK	101
	102	if (name)
	103	return 0;
	104
dc856692	105	for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
24f033e8	106	{
dc856692 MK	107	/* Check for "restore %g0, SYS_sigreturn, %g1". */
	108	insn = sparc_fetch_instruction (start_pc + *offset);
	109	if (insn != 0x83e82067)
	110	continue;
1e067c66	111
dc856692 MK	112	/* Check for "t ST_SYSCALL". */
	113	insn = sparc_fetch_instruction (start_pc + *offset + 8);
	114	if (insn != 0x91d02000)
	115	continue;
	116
	117	return 1;
5a5effe1	118	}
1e067c66	119
dc856692	120	return 0;
1e067c66 MK	121	}
	122
	123	static struct sparc_frame_cache *
	124	sparc64obsd_frame_cache (struct frame_info next_frame, void *this_cache)
	125	{
	126	struct sparc_frame_cache *cache;
	127	CORE_ADDR addr;
	128
	129	if (*this_cache)
	130	return *this_cache;
	131
	132	cache = sparc_frame_cache (next_frame, this_cache);
	133	gdb_assert (cache == *this_cache);
	134
	135	/* If we couldn't find the frame's function, we're probably dealing
	136	with an on-stack signal trampoline. */
	137	if (cache->pc == 0)
	138	{
	139	cache->pc = frame_pc_unwind (next_frame);
	140	cache->pc &= ~(sparc64obsd_page_size - 1);
	141
	142	/* Since we couldn't find the frame's function, the cache was
	143	initialized under the assumption that we're frameless. */
	144	cache->frameless_p = 0;
	145	addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
5b2d44a0 MK	146	if (addr & 1)
5b2d44a0 MK	147	addr += BIAS;
1e067c66 MK	148	cache->base = addr;
	149	}
	150
	151	/* We find the appropriate instance of `struct sigcontext' at a
	152	fixed offset in the signal frame. */
5b2d44a0	153	addr = cache->base + 128 + 16;
1e067c66 MK	154	cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);
	155
	156	return cache;
	157	}
	158
	159	static void
	160	sparc64obsd_frame_this_id (struct frame_info next_frame, void *this_cache,
	161	struct frame_id *this_id)
	162	{
	163	struct sparc_frame_cache *cache =
	164	sparc64obsd_frame_cache (next_frame, this_cache);
	165
	166	(*this_id) = frame_id_build (cache->base, cache->pc);
	167	}
	168
	169	static void
	170	sparc64obsd_frame_prev_register (struct frame_info *next_frame,
	171	void **this_cache,
	172	int regnum, int *optimizedp,
	173	enum lval_type lvalp, CORE_ADDR addrp,
47ef841b	174	int realnump, gdb_byte valuep)
1e067c66 MK	175	{
	176	struct sparc_frame_cache *cache =
	177	sparc64obsd_frame_cache (next_frame, this_cache);
	178
1f67027d AC	179	trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
1f67027d AC	180	optimizedp, lvalp, addrp, realnump, valuep);
1e067c66 MK	181	}
	182
	183	static const struct frame_unwind sparc64obsd_frame_unwind =
	184	{
	185	SIGTRAMP_FRAME,
	186	sparc64obsd_frame_this_id,
	187	sparc64obsd_frame_prev_register
	188	};
	189
	190	static const struct frame_unwind *
	191	sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
	192	{
	193	CORE_ADDR pc = frame_pc_unwind (next_frame);
	194	char *name;
	195
	196	find_pc_partial_function (pc, &name, NULL, NULL);
	197	if (sparc64obsd_pc_in_sigtramp (pc, name))
	198	return &sparc64obsd_frame_unwind;
	199
	200	return NULL;
	201	}
	202	\f
6df5070e MK	203	/* Kernel debugging support. */
	204
	205	static struct sparc_frame_cache *
93d42b30	206	sparc64obsd_trapframe_cache (struct frame_info next_frame, void *this_cache)
6df5070e MK	207	{
	208	struct sparc_frame_cache *cache;
	209	CORE_ADDR sp, trapframe_addr;
	210	int regnum;
	211
	212	if (*this_cache)
	213	return *this_cache;
	214
	215	cache = sparc_frame_cache (next_frame, this_cache);
	216	gdb_assert (cache == *this_cache);
	217
	218	sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
	219	trapframe_addr = sp + BIAS + 176;
	220
	221	cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
	222
	223	cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
	224	cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
	225	cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
	226
	227	for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
	228	cache->saved_regs[regnum].addr =
	229	trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
	230
	231	return cache;
	232	}
	233
	234	static void
	235	sparc64obsd_trapframe_this_id (struct frame_info *next_frame,
	236	void *this_cache, struct frame_id this_id)
	237	{
	238	struct sparc_frame_cache *cache =
	239	sparc64obsd_trapframe_cache (next_frame, this_cache);
	240
	241	(*this_id) = frame_id_build (cache->base, cache->pc);
	242	}
	243
	244	static void
	245	sparc64obsd_trapframe_prev_register (struct frame_info *next_frame,
	246	void **this_cache,
	247	int regnum, int *optimizedp,
	248	enum lval_type lvalp, CORE_ADDR addrp,
	249	int realnump, gdb_byte valuep)
	250	{
	251	struct sparc_frame_cache *cache =
	252	sparc64obsd_trapframe_cache (next_frame, this_cache);
	253
	254	trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
	255	optimizedp, lvalp, addrp, realnump, valuep);
	256	}
	257
	258	static const struct frame_unwind sparc64obsd_trapframe_unwind =
	259	{
	260	NORMAL_FRAME,
	261	sparc64obsd_trapframe_this_id,
	262	sparc64obsd_trapframe_prev_register
	263	};
	264
	265	static const struct frame_unwind *
	266	sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
	267	{
93d42b30	268	CORE_ADDR pc;
6df5070e MK	269	ULONGEST pstate;
	270	char *name;
	271
	272	/* Check whether we are in privileged mode, and bail out if we're not. */
93d42b30	273	pstate = frame_unwind_register_unsigned (next_frame, SPARC64_PSTATE_REGNUM);
6df5070e MK	274	if ((pstate & SPARC64_PSTATE_PRIV) == 0)
	275	return NULL;
	276
93d42b30 DJ	277	pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
93d42b30 DJ	278	find_pc_partial_function (pc, &name, NULL, NULL);
6df5070e MK	279	if (name && strcmp (name, "Lslowtrap_reenter") == 0)
	280	return &sparc64obsd_trapframe_unwind;
	281
	282	return NULL;
	283	}
	284	\f
1e067c66	285
585e38ed MK	286	/* Threads support. */
	287
	288	/* Offset wthin the thread structure where we can find %fp and %i7. */
	289	#define SPARC64OBSD_UTHREAD_FP_OFFSET 232
	290	#define SPARC64OBSD_UTHREAD_PC_OFFSET 240
	291
	292	static void
	293	sparc64obsd_supply_uthread (struct regcache *regcache,
	294	int regnum, CORE_ADDR addr)
	295	{
	296	CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
	297	gdb_byte buf[8];
	298
	299	gdb_assert (regnum >= -1);
	300
	301	fp = read_memory_unsigned_integer (fp_addr, 8);
	302	if (regnum == SPARC_SP_REGNUM \|\| regnum == -1)
	303	{
	304	store_unsigned_integer (buf, 8, fp);
	305	regcache_raw_supply (regcache, SPARC_SP_REGNUM, buf);
	306
	307	if (regnum == SPARC_SP_REGNUM)
	308	return;
	309	}
	310
	311	if (regnum == SPARC64_PC_REGNUM \|\| regnum == SPARC64_NPC_REGNUM
	312	\|\| regnum == -1)
	313	{
	314	CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
	315
	316	i7 = read_memory_unsigned_integer (i7_addr, 8);
	317	if (regnum == SPARC64_PC_REGNUM \|\| regnum == -1)
	318	{
	319	store_unsigned_integer (buf, 8, i7 + 8);
	320	regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
	321	}
	322	if (regnum == SPARC64_NPC_REGNUM \|\| regnum == -1)
	323	{
	324	store_unsigned_integer (buf, 8, i7 + 12);
	325	regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, buf);
	326	}
	327
	328	if (regnum == SPARC64_PC_REGNUM \|\| regnum == SPARC64_NPC_REGNUM)
	329	return;
	330	}
	331
	332	sparc_supply_rwindow (regcache, fp, regnum);
	333	}
	334
	335	static void
	336	sparc64obsd_collect_uthread(const struct regcache *regcache,
	337	int regnum, CORE_ADDR addr)
	338	{
	339	CORE_ADDR sp;
	340	gdb_byte buf[8];
	341
	342	gdb_assert (regnum >= -1);
	343
	344	if (regnum == SPARC_SP_REGNUM \|\| regnum == -1)
	345	{
	346	CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
	347
	348	regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
	349	write_memory (fp_addr,buf, 8);
350	}
351
352	if (regnum == SPARC64_PC_REGNUM \|\| regnum == -1)
353	{
354	CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
355
356	regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
357	i7 = extract_unsigned_integer (buf, 8) - 8;
358	write_memory_unsigned_integer (i7_addr, 8, i7);
359
360	if (regnum == SPARC64_PC_REGNUM)
361	return;
362	}
363
364	regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
365	sp = extract_unsigned_integer (buf, 8);
366	sparc_collect_rwindow (regcache, sp, regnum);
367	}
368	\f
369
1e067c66 MK	370	static void
	371	sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	372	{
	373	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	374
9ea75c57	375	tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
1e067c66 MK	376	tdep->sizeof_gregset = 832;
1e067c66 MK	377
c893be75 MK	378	/* Make sure we can single-step "new" syscalls. */
	379	tdep->step_trap = sparcnbsd_step_trap;
	380
1e067c66	381	frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer);
6df5070e	382	frame_unwind_append_sniffer (gdbarch, sparc64obsd_trapframe_sniffer);
1e067c66 MK	383
	384	sparc64_init_abi (info, gdbarch);
	385
5b2d44a0	386	/* OpenBSD/sparc64 has SVR4-style shared libraries. */
1e067c66	387	set_solib_svr4_fetch_link_map_offsets
3510d1f2	388	(gdbarch, svr4_lp64_fetch_link_map_offsets);
4807909c	389	set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
585e38ed MK	390
	391	/* OpenBSD provides a user-level threads implementation. */
	392	bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
	393	bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
1e067c66	394	}
1e067c66	395	\f
5b2d44a0	396
1e067c66 MK	397	/* Provide a prototype to silence -Wmissing-prototypes. */
	398	void _initialize_sparc64obsd_tdep (void);
	399
	400	void
	401	_initialize_sparc64obsd_tdep (void)
	402	{
	403	gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
	404	GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi);
	405	}