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

/* Target-dependent code for OpenBSD/sparc64.

   Copyright (C) 2004-2014 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"

/* Older OpenBSD versions used the traditional NetBSD core file
   format, even for ports that use ELF.  These 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).

   Newer OpenBSD versions use ELF core files.  Here the register sets
   match the ptrace(2) layout.  */

/* From <machine/reg.h>.  */
const struct sparc_gregmap sparc64obsd_gregmap =
{
  0 * 8,			/* "tstate" */
  1 * 8,			/* %pc */
  2 * 8,			/* %npc */
  3 * 8,			/* %y */
  -1,				/* %fprs */
  -1,
  5 * 8,			/* %g1 */
  20 * 8,			/* %l0 */
  4				/* sizeof (%y) */
};

const struct sparc_gregmap sparc64obsd_core_gregmap =
{
  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 void *fpregs = (char *)gregs + 288;

  if (len < 832)
    {
      sparc64_supply_gregset (&sparc64obsd_gregmap, regcache, regnum, gregs);
      return;
    }

  sparc64_supply_gregset (&sparc64obsd_core_gregmap, regcache, regnum, gregs);
  sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
}

static void
sparc64obsd_supply_fpregset (const struct regset *regset,
			     struct regcache *regcache,
			     int regnum, const void *fpregs, size_t len)
{
  sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
}
\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, const 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 *this_frame, void **this_cache)
{
  struct sparc_frame_cache *cache;
  CORE_ADDR addr;

  if (*this_cache)
    return *this_cache;

  cache = sparc_frame_cache (this_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 = get_frame_pc (this_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.  */
      sparc_record_save_insn (cache);
      addr = get_frame_register_unsigned (this_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, this_frame);

  return cache;
}

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

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

static struct value *
sparc64obsd_frame_prev_register (struct frame_info *this_frame,
				 void **this_cache, int regnum)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_frame_cache (this_frame, this_cache);

  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
}

static int
sparc64obsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
				    struct frame_info *this_frame,
				    void **this_cache)
{
  CORE_ADDR pc = get_frame_pc (this_frame);
  const char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);
  if (sparc64obsd_pc_in_sigtramp (pc, name))
    return 1;

  return 0;
}

static const struct frame_unwind sparc64obsd_frame_unwind =
{
  SIGTRAMP_FRAME,
  default_frame_unwind_stop_reason,
  sparc64obsd_frame_this_id,
  sparc64obsd_frame_prev_register,
  NULL,
  sparc64obsd_sigtramp_frame_sniffer
};
\f
/* Kernel debugging support.  */

static struct sparc_frame_cache *
sparc64obsd_trapframe_cache (struct frame_info *this_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 (this_frame, this_cache);
  gdb_assert (cache == *this_cache);

  sp = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
  trapframe_addr = sp + BIAS + 176;

  cache->saved_regs = trad_frame_alloc_saved_regs (this_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 *this_frame,
			       void **this_cache, struct frame_id *this_id)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (this_frame, this_cache);

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

static struct value *
sparc64obsd_trapframe_prev_register (struct frame_info *this_frame,
				     void **this_cache, int regnum)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (this_frame, this_cache);

  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
}

static int
sparc64obsd_trapframe_sniffer (const struct frame_unwind *self,
			       struct frame_info *this_frame,
			       void **this_cache)
{
  CORE_ADDR pc;
  ULONGEST pstate;
  const char *name;

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

  pc = get_frame_address_in_block (this_frame);
  find_pc_partial_function (pc, &name, NULL, NULL);
  if (name && strcmp (name, "Lslowtrap_reenter") == 0)
    return 1;

  return 0;
}

static const struct frame_unwind sparc64obsd_trapframe_unwind =
{
  NORMAL_FRAME,
  default_frame_unwind_stop_reason,
  sparc64obsd_trapframe_this_id,
  sparc64obsd_trapframe_prev_register,
  NULL,
  sparc64obsd_trapframe_sniffer
};
\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)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  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, byte_order);
  if (regnum == SPARC_SP_REGNUM || regnum == -1)
    {
      store_unsigned_integer (buf, 8, byte_order, 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, byte_order);
      if (regnum == SPARC64_PC_REGNUM || regnum == -1)
	{
	  store_unsigned_integer (buf, 8, byte_order, i7 + 8);
	  regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
	}
      if (regnum == SPARC64_NPC_REGNUM || regnum == -1)
	{
	  store_unsigned_integer (buf, 8, byte_order, 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)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  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, byte_order) - 8;
      write_memory_unsigned_integer (i7_addr, 8, byte_order, i7);

      if (regnum == SPARC64_PC_REGNUM)
	return;
    }

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

static const struct regset sparc64obsd_gregset =
  {
    NULL, sparc64obsd_supply_gregset, NULL
  };

static const struct regset sparc64obsd_fpregset =
  {
    NULL, sparc64obsd_supply_fpregset, NULL
  };

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

  tdep->gregset = &sparc64obsd_gregset;
  tdep->sizeof_gregset = 288;
  tdep->fpregset = &sparc64obsd_fpregset;
  tdep->sizeof_fpregset = 272;

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

  frame_unwind_append_unwinder (gdbarch, &sparc64obsd_frame_unwind);
  frame_unwind_append_unwinder (gdbarch, &sparc64obsd_trapframe_unwind);

  sparc64_init_abi (info, gdbarch);
  obsd_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
ecd75fc8	3	Copyright (C) 2004-2014 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	37
26fd9228 MK	38	/* Older OpenBSD versions used the traditional NetBSD core file
	39	format, even for ports that use ELF. These core files don't use
	40	multiple register sets. Instead, the general-purpose and
	41	floating-point registers are lumped together in a single section.
	42	Unlike on NetBSD, OpenBSD uses a different layout for its
	43	general-purpose registers than the layout used for ptrace(2).
	44
	45	Newer OpenBSD versions use ELF core files. Here the register sets
	46	match the ptrace(2) layout. */
1e067c66 MK	47
1e067c66 MK	48	/* From <machine/reg.h>. */
b4fd25c9	49	const struct sparc_gregmap sparc64obsd_gregmap =
26fd9228 MK	50	{
	51	0 * 8, /* "tstate" */
	52	1 * 8, /* %pc */
	53	2 * 8, /* %npc */
	54	3 * 8, /* %y */
	55	-1, /* %fprs */
	56	-1,
	57	5 * 8, /* %g1 */
	58	20 * 8, /* %l0 */
	59	4 /* sizeof (%y) */
	60	};
	61
b4fd25c9	62	const struct sparc_gregmap sparc64obsd_core_gregmap =
1e067c66 MK	63	{
	64	0 * 8, /* "tstate" */
	65	1 * 8, /* %pc */
	66	2 * 8, /* %npc */
	67	3 * 8, /* %y */
	68	-1, /* %fprs */
	69	-1,
	70	7 * 8, /* %g1 */
	71	22 * 8, /* %l0 */
	72	4 /* sizeof (%y) */
	73	};
	74
	75	static void
	76	sparc64obsd_supply_gregset (const struct regset *regset,
	77	struct regcache *regcache,
	78	int regnum, const void *gregs, size_t len)
	79	{
26fd9228	80	const void fpregs = (char )gregs + 288;
1e067c66	81
26fd9228 MK	82	if (len < 832)
26fd9228 MK	83	{
b4fd25c9	84	sparc64_supply_gregset (&sparc64obsd_gregmap, regcache, regnum, gregs);
26fd9228 MK	85	return;
	86	}
	87
b4fd25c9 AA	88	sparc64_supply_gregset (&sparc64obsd_core_gregmap, regcache, regnum, gregs);
b4fd25c9 AA	89	sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
26fd9228 MK	90	}
	91
	92	static void
	93	sparc64obsd_supply_fpregset (const struct regset *regset,
	94	struct regcache *regcache,
	95	int regnum, const void *fpregs, size_t len)
	96	{
b4fd25c9	97	sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
1e067c66 MK	98	}
	99	\f
	100
	101	/* Signal trampolines. */
	102
47b4f830 MK	103	/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
	104	in virtual memory. The randomness makes it somewhat tricky to
	105	detect it, but fortunately we can rely on the fact that the start
	106	of the sigtramp routine is page-aligned. We recognize the
	107	trampoline by looking for the code that invokes the sigreturn
	108	system call. The offset where we can find that code varies from
	109	release to release.
	110
	111	By the way, the mapping mentioned above is read-only, so you cannot
	112	place a breakpoint in the signal trampoline. */
	113
	114	/* Default page size. */
1e067c66	115	static const int sparc64obsd_page_size = 8192;
47b4f830 MK	116
	117	/* Offset for sigreturn(2). */
	118	static const int sparc64obsd_sigreturn_offset[] = {
	119	0xf0, /* OpenBSD 3.8 */
	120	0xec, /* OpenBSD 3.6 */
	121	0xe8, /* OpenBSD 3.2 */
	122	-1
	123	};
1e067c66 MK	124
1e067c66 MK	125	static int
2c02bd72	126	sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
1e067c66 MK	127	{
	128	CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
	129	unsigned long insn;
dc856692	130	const int *offset;
1e067c66 MK	131
	132	if (name)
	133	return 0;
	134
dc856692	135	for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
24f033e8	136	{
dc856692 MK	137	/* Check for "restore %g0, SYS_sigreturn, %g1". */
	138	insn = sparc_fetch_instruction (start_pc + *offset);
	139	if (insn != 0x83e82067)
	140	continue;
1e067c66	141
dc856692 MK	142	/* Check for "t ST_SYSCALL". */
	143	insn = sparc_fetch_instruction (start_pc + *offset + 8);
	144	if (insn != 0x91d02000)
	145	continue;
	146
	147	return 1;
5a5effe1	148	}
1e067c66	149
dc856692	150	return 0;
1e067c66 MK	151	}
	152
	153	static struct sparc_frame_cache *
94afd7a6	154	sparc64obsd_frame_cache (struct frame_info this_frame, void *this_cache)
1e067c66 MK	155	{
	156	struct sparc_frame_cache *cache;
	157	CORE_ADDR addr;
	158
	159	if (*this_cache)
	160	return *this_cache;
	161
94afd7a6	162	cache = sparc_frame_cache (this_frame, this_cache);
1e067c66 MK	163	gdb_assert (cache == *this_cache);
	164
	165	/* If we couldn't find the frame's function, we're probably dealing
	166	with an on-stack signal trampoline. */
	167	if (cache->pc == 0)
	168	{
94afd7a6	169	cache->pc = get_frame_pc (this_frame);
1e067c66 MK	170	cache->pc &= ~(sparc64obsd_page_size - 1);
	171
	172	/* Since we couldn't find the frame's function, the cache was
	173	initialized under the assumption that we're frameless. */
369c397b	174	sparc_record_save_insn (cache);
94afd7a6	175	addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
5b2d44a0 MK	176	if (addr & 1)
5b2d44a0 MK	177	addr += BIAS;
1e067c66 MK	178	cache->base = addr;
	179	}
	180
	181	/* We find the appropriate instance of `struct sigcontext' at a
	182	fixed offset in the signal frame. */
5b2d44a0	183	addr = cache->base + 128 + 16;
94afd7a6	184	cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);
1e067c66 MK	185
	186	return cache;
	187	}
	188
	189	static void
94afd7a6	190	sparc64obsd_frame_this_id (struct frame_info this_frame, void *this_cache,
1e067c66 MK	191	struct frame_id *this_id)
	192	{
	193	struct sparc_frame_cache *cache =
94afd7a6	194	sparc64obsd_frame_cache (this_frame, this_cache);
1e067c66 MK	195
	196	(*this_id) = frame_id_build (cache->base, cache->pc);
	197	}
	198
94afd7a6 UW	199	static struct value *
	200	sparc64obsd_frame_prev_register (struct frame_info *this_frame,
	201	void **this_cache, int regnum)
1e067c66 MK	202	{
1e067c66 MK	203	struct sparc_frame_cache *cache =
94afd7a6	204	sparc64obsd_frame_cache (this_frame, this_cache);
1e067c66	205
94afd7a6	206	return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
1e067c66 MK	207	}
1e067c66 MK	208
94afd7a6 UW	209	static int
	210	sparc64obsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
	211	struct frame_info *this_frame,
	212	void **this_cache)
1e067c66	213	{
94afd7a6	214	CORE_ADDR pc = get_frame_pc (this_frame);
2c02bd72	215	const char *name;
1e067c66 MK	216
	217	find_pc_partial_function (pc, &name, NULL, NULL);
	218	if (sparc64obsd_pc_in_sigtramp (pc, name))
94afd7a6	219	return 1;
1e067c66	220
94afd7a6	221	return 0;
1e067c66	222	}
94afd7a6 UW	223
	224	static const struct frame_unwind sparc64obsd_frame_unwind =
	225	{
	226	SIGTRAMP_FRAME,
8fbca658	227	default_frame_unwind_stop_reason,
94afd7a6 UW	228	sparc64obsd_frame_this_id,
	229	sparc64obsd_frame_prev_register,
	230	NULL,
	231	sparc64obsd_sigtramp_frame_sniffer
	232	};
1e067c66	233	\f
6df5070e MK	234	/* Kernel debugging support. */
	235
	236	static struct sparc_frame_cache *
94afd7a6	237	sparc64obsd_trapframe_cache (struct frame_info this_frame, void *this_cache)
6df5070e MK	238	{
	239	struct sparc_frame_cache *cache;
	240	CORE_ADDR sp, trapframe_addr;
	241	int regnum;
	242
	243	if (*this_cache)
	244	return *this_cache;
	245
94afd7a6	246	cache = sparc_frame_cache (this_frame, this_cache);
6df5070e MK	247	gdb_assert (cache == *this_cache);
6df5070e MK	248
94afd7a6	249	sp = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
6df5070e MK	250	trapframe_addr = sp + BIAS + 176;
6df5070e MK	251
94afd7a6	252	cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
6df5070e MK	253
	254	cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
	255	cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
	256	cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
	257
	258	for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
	259	cache->saved_regs[regnum].addr =
	260	trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
	261
	262	return cache;
	263	}
	264
	265	static void
94afd7a6	266	sparc64obsd_trapframe_this_id (struct frame_info *this_frame,
6df5070e MK	267	void *this_cache, struct frame_id this_id)
	268	{
	269	struct sparc_frame_cache *cache =
94afd7a6	270	sparc64obsd_trapframe_cache (this_frame, this_cache);
6df5070e MK	271
	272	(*this_id) = frame_id_build (cache->base, cache->pc);
	273	}
	274
94afd7a6 UW	275	static struct value *
	276	sparc64obsd_trapframe_prev_register (struct frame_info *this_frame,
	277	void **this_cache, int regnum)
6df5070e MK	278	{
6df5070e MK	279	struct sparc_frame_cache *cache =
94afd7a6	280	sparc64obsd_trapframe_cache (this_frame, this_cache);
6df5070e	281
94afd7a6	282	return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
6df5070e MK	283	}
6df5070e MK	284
94afd7a6 UW	285	static int
	286	sparc64obsd_trapframe_sniffer (const struct frame_unwind *self,
	287	struct frame_info *this_frame,
	288	void **this_cache)
6df5070e	289	{
93d42b30	290	CORE_ADDR pc;
6df5070e	291	ULONGEST pstate;
2c02bd72	292	const char *name;
6df5070e MK	293
6df5070e MK	294	/* Check whether we are in privileged mode, and bail out if we're not. */
94afd7a6	295	pstate = get_frame_register_unsigned (this_frame, SPARC64_PSTATE_REGNUM);
6df5070e	296	if ((pstate & SPARC64_PSTATE_PRIV) == 0)
94afd7a6	297	return 0;
6df5070e	298
94afd7a6	299	pc = get_frame_address_in_block (this_frame);
93d42b30	300	find_pc_partial_function (pc, &name, NULL, NULL);
6df5070e	301	if (name && strcmp (name, "Lslowtrap_reenter") == 0)
94afd7a6	302	return 1;
6df5070e	303
94afd7a6	304	return 0;
6df5070e	305	}
94afd7a6 UW	306
	307	static const struct frame_unwind sparc64obsd_trapframe_unwind =
	308	{
	309	NORMAL_FRAME,
8fbca658	310	default_frame_unwind_stop_reason,
94afd7a6 UW	311	sparc64obsd_trapframe_this_id,
	312	sparc64obsd_trapframe_prev_register,
	313	NULL,
	314	sparc64obsd_trapframe_sniffer
	315	};
6df5070e	316	\f
1e067c66	317
585e38ed MK	318	/* Threads support. */
	319
	320	/* Offset wthin the thread structure where we can find %fp and %i7. */
	321	#define SPARC64OBSD_UTHREAD_FP_OFFSET 232
	322	#define SPARC64OBSD_UTHREAD_PC_OFFSET 240
	323
	324	static void
	325	sparc64obsd_supply_uthread (struct regcache *regcache,
	326	int regnum, CORE_ADDR addr)
	327	{
e17a4113 UW	328	struct gdbarch *gdbarch = get_regcache_arch (regcache);
e17a4113 UW	329	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
585e38ed MK	330	CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
	331	gdb_byte buf[8];
	332
	333	gdb_assert (regnum >= -1);
	334
e17a4113	335	fp = read_memory_unsigned_integer (fp_addr, 8, byte_order);
585e38ed MK	336	if (regnum == SPARC_SP_REGNUM \|\| regnum == -1)
585e38ed MK	337	{
e17a4113	338	store_unsigned_integer (buf, 8, byte_order, fp);
585e38ed MK	339	regcache_raw_supply (regcache, SPARC_SP_REGNUM, buf);
	340
	341	if (regnum == SPARC_SP_REGNUM)
	342	return;
	343	}
	344
	345	if (regnum == SPARC64_PC_REGNUM \|\| regnum == SPARC64_NPC_REGNUM
	346	\|\| regnum == -1)
	347	{
	348	CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
	349
e17a4113	350	i7 = read_memory_unsigned_integer (i7_addr, 8, byte_order);
585e38ed MK	351	if (regnum == SPARC64_PC_REGNUM \|\| regnum == -1)
585e38ed MK	352	{
e17a4113	353	store_unsigned_integer (buf, 8, byte_order, i7 + 8);
585e38ed MK	354	regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
	355	}
	356	if (regnum == SPARC64_NPC_REGNUM \|\| regnum == -1)
	357	{
e17a4113	358	store_unsigned_integer (buf, 8, byte_order, i7 + 12);
585e38ed MK	359	regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, buf);
	360	}
	361
	362	if (regnum == SPARC64_PC_REGNUM \|\| regnum == SPARC64_NPC_REGNUM)
	363	return;
	364	}
	365
	366	sparc_supply_rwindow (regcache, fp, regnum);
	367	}
	368
	369	static void
	370	sparc64obsd_collect_uthread(const struct regcache *regcache,
	371	int regnum, CORE_ADDR addr)
	372	{
e17a4113 UW	373	struct gdbarch *gdbarch = get_regcache_arch (regcache);
e17a4113 UW	374	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
585e38ed MK	375	CORE_ADDR sp;
	376	gdb_byte buf[8];
	377
	378	gdb_assert (regnum >= -1);
	379
	380	if (regnum == SPARC_SP_REGNUM \|\| regnum == -1)
	381	{
	382	CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
	383
	384	regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
	385	write_memory (fp_addr,buf, 8);
	386	}
	387
	388	if (regnum == SPARC64_PC_REGNUM \|\| regnum == -1)
	389	{
	390	CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
	391
	392	regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
e17a4113 UW	393	i7 = extract_unsigned_integer (buf, 8, byte_order) - 8;
e17a4113 UW	394	write_memory_unsigned_integer (i7_addr, 8, byte_order, i7);
585e38ed MK	395
	396	if (regnum == SPARC64_PC_REGNUM)
	397	return;
	398	}
	399
	400	regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
e17a4113	401	sp = extract_unsigned_integer (buf, 8, byte_order);
585e38ed MK	402	sparc_collect_rwindow (regcache, sp, regnum);
	403	}
	404	\f
	405
b13feb94 AA	406	static const struct regset sparc64obsd_gregset =
	407	{
	408	NULL, sparc64obsd_supply_gregset, NULL
	409	};
	410
	411	static const struct regset sparc64obsd_fpregset =
	412	{
	413	NULL, sparc64obsd_supply_fpregset, NULL
	414	};
	415
1e067c66 MK	416	static void
	417	sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	418	{
	419	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	420
b13feb94	421	tdep->gregset = &sparc64obsd_gregset;
26fd9228	422	tdep->sizeof_gregset = 288;
b13feb94	423	tdep->fpregset = &sparc64obsd_fpregset;
26fd9228	424	tdep->sizeof_fpregset = 272;
1e067c66	425
c893be75 MK	426	/* Make sure we can single-step "new" syscalls. */
	427	tdep->step_trap = sparcnbsd_step_trap;
	428
94afd7a6 UW	429	frame_unwind_append_unwinder (gdbarch, &sparc64obsd_frame_unwind);
94afd7a6 UW	430	frame_unwind_append_unwinder (gdbarch, &sparc64obsd_trapframe_unwind);
1e067c66 MK	431
1e067c66 MK	432	sparc64_init_abi (info, gdbarch);
0548b5db	433	obsd_init_abi (info, gdbarch);
1e067c66	434
5b2d44a0	435	/* OpenBSD/sparc64 has SVR4-style shared libraries. */
1e067c66	436	set_solib_svr4_fetch_link_map_offsets
3510d1f2	437	(gdbarch, svr4_lp64_fetch_link_map_offsets);
4807909c	438	set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
585e38ed MK	439
	440	/* OpenBSD provides a user-level threads implementation. */
	441	bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
	442	bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
1e067c66	443	}
1e067c66	444	\f
5b2d44a0	445
1e067c66 MK	446	/* Provide a prototype to silence -Wmissing-prototypes. */
	447	void _initialize_sparc64obsd_tdep (void);
	448
	449	void
	450	_initialize_sparc64obsd_tdep (void)
	451	{
	452	gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
	453	GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi);
	454	}