[deliverable/binutils-gdb.git] / gdb / spu-multiarch.c

/* Cell SPU GNU/Linux multi-architecture debugging support.
   Copyright (C) 2009-2014 Free Software Foundation, Inc.

   Contributed by Ulrich Weigand <uweigand@de.ibm.com>.

   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 "gdbcore.h"
#include "gdbcmd.h"
#include <string.h>
#include "gdb_assert.h"
#include "arch-utils.h"
#include "observer.h"
#include "inferior.h"
#include "regcache.h"
#include "symfile.h"
#include "objfiles.h"
#include "solib.h"
#include "solist.h"

#include "ppc-tdep.h"
#include "ppc-linux-tdep.h"
#include "spu-tdep.h"

/* This module's target vector.  */
static struct target_ops spu_ops;

/* Number of SPE objects loaded into the current inferior.  */
static int spu_nr_solib;

/* Stand-alone SPE executable?  */
#define spu_standalone_p() \
  (symfile_objfile && symfile_objfile->obfd \
   && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu)

/* PPU side system calls.  */
#define INSTR_SC	0x44000002
#define NR_spu_run	0x0116

/* If the PPU thread is currently stopped on a spu_run system call,
   return to FD and ADDR the file handle and NPC parameter address
   used with the system call.  Return non-zero if successful.  */
static int
parse_spufs_run (ptid_t ptid, int *fd, CORE_ADDR *addr)
{
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  struct gdbarch_tdep *tdep;
  struct regcache *regcache;
  gdb_byte buf[4];
  ULONGEST regval;

  /* If we're not on PPU, there's nothing to detect.  */
  if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_powerpc)
    return 0;

  /* Get PPU-side registers.  */
  regcache = get_thread_arch_regcache (ptid, target_gdbarch ());
  tdep = gdbarch_tdep (target_gdbarch ());

  /* Fetch instruction preceding current NIP.  */
  if (target_read_memory (regcache_read_pc (regcache) - 4, buf, 4) != 0)
    return 0;
  /* It should be a "sc" instruction.  */
  if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC)
    return 0;
  /* System call number should be NR_spu_run.  */
  regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum, &regval);
  if (regval != NR_spu_run)
    return 0;

  /* Register 3 contains fd, register 4 the NPC param pointer.  */
  regcache_cooked_read_unsigned (regcache, PPC_ORIG_R3_REGNUM, &regval);
  *fd = (int) regval;
  regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 4, &regval);
  *addr = (CORE_ADDR) regval;
  return 1;
}

/* Find gdbarch for SPU context SPUFS_FD.  */
static struct gdbarch *
spu_gdbarch (int spufs_fd)
{
  struct gdbarch_info info;
  gdbarch_info_init (&info);
  info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
  info.byte_order = BFD_ENDIAN_BIG;
  info.osabi = GDB_OSABI_LINUX;
  info.tdep_info = (void *) &spufs_fd;
  return gdbarch_find_by_info (info);
}

/* Override the to_thread_architecture routine.  */
static struct gdbarch *
spu_thread_architecture (struct target_ops *ops, ptid_t ptid)
{
  int spufs_fd;
  CORE_ADDR spufs_addr;

  if (parse_spufs_run (ptid, &spufs_fd, &spufs_addr))
    return spu_gdbarch (spufs_fd);

  return target_gdbarch ();
}

/* Override the to_region_ok_for_hw_watchpoint routine.  */
static int
spu_region_ok_for_hw_watchpoint (struct target_ops *self,
				 CORE_ADDR addr, int len)
{
  struct target_ops *ops_beneath = find_target_beneath (&spu_ops);

  /* We cannot watch SPU local store.  */
  if (SPUADDR_SPU (addr) != -1)
    return 0;

  return ops_beneath->to_region_ok_for_hw_watchpoint (ops_beneath, addr, len);
}

/* Override the to_fetch_registers routine.  */
static void
spu_fetch_registers (struct target_ops *ops,
		     struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  struct target_ops *ops_beneath = find_target_beneath (ops);
  int spufs_fd;
  CORE_ADDR spufs_addr;

  /* This version applies only if we're currently in spu_run.  */
  if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
    {
      ops_beneath->to_fetch_registers (ops_beneath, regcache, regno);
      return;
    }

  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
    return;

  /* The ID register holds the spufs file handle.  */
  if (regno == -1 || regno == SPU_ID_REGNUM)
    {
      gdb_byte buf[4];
      store_unsigned_integer (buf, 4, byte_order, spufs_fd);
      regcache_raw_supply (regcache, SPU_ID_REGNUM, buf);
    }

  /* The NPC register is found in PPC memory at SPUFS_ADDR.  */
  if (regno == -1 || regno == SPU_PC_REGNUM)
    {
      gdb_byte buf[4];

      if (target_read (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
		       buf, spufs_addr, sizeof buf) == sizeof buf)
	regcache_raw_supply (regcache, SPU_PC_REGNUM, buf);
    }

  /* The GPRs are found in the "regs" spufs file.  */
  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
    {
      gdb_byte buf[16 * SPU_NUM_GPRS];
      char annex[32];
      int i;

      xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
      if (target_read (ops_beneath, TARGET_OBJECT_SPU, annex,
		       buf, 0, sizeof buf) == sizeof buf)
	for (i = 0; i < SPU_NUM_GPRS; i++)
	  regcache_raw_supply (regcache, i, buf + i*16);
    }
}

/* Override the to_store_registers routine.  */
static void
spu_store_registers (struct target_ops *ops,
		     struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  struct target_ops *ops_beneath = find_target_beneath (ops);
  int spufs_fd;
  CORE_ADDR spufs_addr;

  /* This version applies only if we're currently in spu_run.  */
  if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
    {
      ops_beneath->to_store_registers (ops_beneath, regcache, regno);
      return;
    }

  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
    return;

  /* The NPC register is found in PPC memory at SPUFS_ADDR.  */
  if (regno == -1 || regno == SPU_PC_REGNUM)
    {
      gdb_byte buf[4];
      regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);

      target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
		    buf, spufs_addr, sizeof buf);
    }

  /* The GPRs are found in the "regs" spufs file.  */
  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
    {
      gdb_byte buf[16 * SPU_NUM_GPRS];
      char annex[32];
      int i;

      for (i = 0; i < SPU_NUM_GPRS; i++)
	regcache_raw_collect (regcache, i, buf + i*16);

      xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
      target_write (ops_beneath, TARGET_OBJECT_SPU, annex,
		    buf, 0, sizeof buf);
    }
}

/* Override the to_xfer_partial routine.  */
static enum target_xfer_status
spu_xfer_partial (struct target_ops *ops, enum target_object object,
		  const char *annex, gdb_byte *readbuf,
		  const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
		  ULONGEST *xfered_len)
{
  struct target_ops *ops_beneath = find_target_beneath (ops);

  /* Use the "mem" spufs file to access SPU local store.  */
  if (object == TARGET_OBJECT_MEMORY)
    {
      int fd = SPUADDR_SPU (offset);
      CORE_ADDR addr = SPUADDR_ADDR (offset);
      char mem_annex[32], lslr_annex[32];
      gdb_byte buf[32];
      ULONGEST lslr;
      enum target_xfer_status ret;

      if (fd >= 0)
	{
	  xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
	  ret = ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
					      mem_annex, readbuf, writebuf,
					      addr, len, xfered_len);
	  if (ret == TARGET_XFER_OK)
	    return ret;

	  /* SPU local store access wraps the address around at the
	     local store limit.  We emulate this here.  To avoid needing
	     an extra access to retrieve the LSLR, we only do that after
	     trying the original address first, and getting end-of-file.  */
	  xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd);
	  memset (buf, 0, sizeof buf);
	  if (ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
					    lslr_annex, buf, NULL,
					    0, sizeof buf, xfered_len)
	      != TARGET_XFER_OK)
	    return ret;

	  lslr = strtoulst ((char *) buf, NULL, 16);
	  return ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
					       mem_annex, readbuf, writebuf,
					       addr & lslr, len, xfered_len);
	}
    }

  return ops_beneath->to_xfer_partial (ops_beneath, object, annex,
				       readbuf, writebuf, offset, len, xfered_len);
}

/* Override the to_search_memory routine.  */
static int
spu_search_memory (struct target_ops* ops,
		   CORE_ADDR start_addr, ULONGEST search_space_len,
		   const gdb_byte *pattern, ULONGEST pattern_len,
		   CORE_ADDR *found_addrp)
{
  struct target_ops *ops_beneath = find_target_beneath (ops);

  /* For SPU local store, always fall back to the simple method.  */
  if (SPUADDR_SPU (start_addr) >= 0)
    return simple_search_memory (ops,
				 start_addr, search_space_len,
				 pattern, pattern_len, found_addrp);

  return ops_beneath->to_search_memory (ops_beneath,
					start_addr, search_space_len,
					pattern, pattern_len, found_addrp);
}


/* Push and pop the SPU multi-architecture support target.  */

static void
spu_multiarch_activate (void)
{
  /* If GDB was configured without SPU architecture support,
     we cannot install SPU multi-architecture support either.  */
  if (spu_gdbarch (-1) == NULL)
    return;

  push_target (&spu_ops);

  /* Make sure the thread architecture is re-evaluated.  */
  registers_changed ();
}

static void
spu_multiarch_deactivate (void)
{
  unpush_target (&spu_ops);

  /* Make sure the thread architecture is re-evaluated.  */
  registers_changed ();
}

static void
spu_multiarch_inferior_created (struct target_ops *ops, int from_tty)
{
  if (spu_standalone_p ())
    spu_multiarch_activate ();
}

static void
spu_multiarch_solib_loaded (struct so_list *so)
{
  if (!spu_standalone_p ())
    if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
      if (spu_nr_solib++ == 0)
	spu_multiarch_activate ();
}

static void
spu_multiarch_solib_unloaded (struct so_list *so)
{
  if (!spu_standalone_p ())
    if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
      if (--spu_nr_solib == 0)
	spu_multiarch_deactivate ();
}

static void
spu_mourn_inferior (struct target_ops *ops)
{
  struct target_ops *ops_beneath = find_target_beneath (ops);

  ops_beneath->to_mourn_inferior (ops_beneath);
  spu_multiarch_deactivate ();
}


/* Initialize the SPU multi-architecture support target.  */

static void
init_spu_ops (void)
{
  spu_ops.to_shortname = "spu";
  spu_ops.to_longname = "SPU multi-architecture support.";
  spu_ops.to_doc = "SPU multi-architecture support.";
  spu_ops.to_mourn_inferior = spu_mourn_inferior;
  spu_ops.to_fetch_registers = spu_fetch_registers;
  spu_ops.to_store_registers = spu_store_registers;
  spu_ops.to_xfer_partial = spu_xfer_partial;
  spu_ops.to_search_memory = spu_search_memory;
  spu_ops.to_region_ok_for_hw_watchpoint = spu_region_ok_for_hw_watchpoint;
  spu_ops.to_thread_architecture = spu_thread_architecture;
  spu_ops.to_stratum = arch_stratum;
  spu_ops.to_magic = OPS_MAGIC;
}

/* -Wmissing-prototypes */
extern initialize_file_ftype _initialize_spu_multiarch;

void
_initialize_spu_multiarch (void)
{
  /* Install ourselves on the target stack.  */
  init_spu_ops ();
  complete_target_initialization (&spu_ops);

  /* Install observers to watch for SPU objects.  */
  observer_attach_inferior_created (spu_multiarch_inferior_created);
  observer_attach_solib_loaded (spu_multiarch_solib_loaded);
  observer_attach_solib_unloaded (spu_multiarch_solib_unloaded);
}
Commit	Line	Data
85e747d2	1	/* Cell SPU GNU/Linux multi-architecture debugging support.
ecd75fc8	2	Copyright (C) 2009-2014 Free Software Foundation, Inc.
85e747d2 UW	3
	4	Contributed by Ulrich Weigand <uweigand@de.ibm.com>.
	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
dcf7800b	10	the Free Software Foundation; either version 3 of the License, or
85e747d2 UW	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
dcf7800b	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
85e747d2 UW	20
	21	#include "defs.h"
	22	#include "gdbcore.h"
	23	#include "gdbcmd.h"
0e9f083f	24	#include <string.h>
85e747d2 UW	25	#include "gdb_assert.h"
	26	#include "arch-utils.h"
	27	#include "observer.h"
	28	#include "inferior.h"
	29	#include "regcache.h"
	30	#include "symfile.h"
	31	#include "objfiles.h"
	32	#include "solib.h"
	33	#include "solist.h"
	34
	35	#include "ppc-tdep.h"
	36	#include "ppc-linux-tdep.h"
	37	#include "spu-tdep.h"
	38
	39	/* This module's target vector. */
	40	static struct target_ops spu_ops;
	41
	42	/* Number of SPE objects loaded into the current inferior. */
	43	static int spu_nr_solib;
	44
	45	/* Stand-alone SPE executable? */
	46	#define spu_standalone_p() \
	47	(symfile_objfile && symfile_objfile->obfd \
	48	&& bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu)
	49
	50	/* PPU side system calls. */
	51	#define INSTR_SC 0x44000002
	52	#define NR_spu_run 0x0116
	53
	54	/* If the PPU thread is currently stopped on a spu_run system call,
	55	return to FD and ADDR the file handle and NPC parameter address
	56	used with the system call. Return non-zero if successful. */
	57	static int
	58	parse_spufs_run (ptid_t ptid, int fd, CORE_ADDR addr)
	59	{
f5656ead	60	enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
85e747d2 UW	61	struct gdbarch_tdep *tdep;
85e747d2 UW	62	struct regcache *regcache;
e362b510	63	gdb_byte buf[4];
85e747d2 UW	64	ULONGEST regval;
	65
	66	/* If we're not on PPU, there's nothing to detect. */
f5656ead	67	if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_powerpc)
85e747d2 UW	68	return 0;
	69
	70	/* Get PPU-side registers. */
f5656ead TT	71	regcache = get_thread_arch_regcache (ptid, target_gdbarch ());
f5656ead TT	72	tdep = gdbarch_tdep (target_gdbarch ());
85e747d2 UW	73
	74	/* Fetch instruction preceding current NIP. */
	75	if (target_read_memory (regcache_read_pc (regcache) - 4, buf, 4) != 0)
	76	return 0;
	77	/* It should be a "sc" instruction. */
	78	if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC)
	79	return 0;
	80	/* System call number should be NR_spu_run. */
	81	regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum, &regval);
	82	if (regval != NR_spu_run)
	83	return 0;
	84
	85	/* Register 3 contains fd, register 4 the NPC param pointer. */
	86	regcache_cooked_read_unsigned (regcache, PPC_ORIG_R3_REGNUM, &regval);
	87	*fd = (int) regval;
	88	regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 4, &regval);
	89	*addr = (CORE_ADDR) regval;
	90	return 1;
	91	}
	92
	93	/* Find gdbarch for SPU context SPUFS_FD. */
	94	static struct gdbarch *
	95	spu_gdbarch (int spufs_fd)
	96	{
	97	struct gdbarch_info info;
	98	gdbarch_info_init (&info);
	99	info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
	100	info.byte_order = BFD_ENDIAN_BIG;
	101	info.osabi = GDB_OSABI_LINUX;
	102	info.tdep_info = (void *) &spufs_fd;
	103	return gdbarch_find_by_info (info);
	104	}
	105
	106	/* Override the to_thread_architecture routine. */
	107	static struct gdbarch *
	108	spu_thread_architecture (struct target_ops *ops, ptid_t ptid)
	109	{
	110	int spufs_fd;
	111	CORE_ADDR spufs_addr;
	112
	113	if (parse_spufs_run (ptid, &spufs_fd, &spufs_addr))
	114	return spu_gdbarch (spufs_fd);
	115
f5656ead	116	return target_gdbarch ();
85e747d2 UW	117	}
	118
	119	/* Override the to_region_ok_for_hw_watchpoint routine. */
	120	static int
31568a15 TT	121	spu_region_ok_for_hw_watchpoint (struct target_ops *self,
31568a15 TT	122	CORE_ADDR addr, int len)
85e747d2 UW	123	{
85e747d2 UW	124	struct target_ops *ops_beneath = find_target_beneath (&spu_ops);
85e747d2 UW	125
	126	/* We cannot watch SPU local store. */
	127	if (SPUADDR_SPU (addr) != -1)
	128	return 0;
	129
e75fdfca	130	return ops_beneath->to_region_ok_for_hw_watchpoint (ops_beneath, addr, len);
85e747d2 UW	131	}
	132
	133	/* Override the to_fetch_registers routine. */
	134	static void
	135	spu_fetch_registers (struct target_ops *ops,
	136	struct regcache *regcache, int regno)
	137	{
	138	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	139	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	140	struct target_ops *ops_beneath = find_target_beneath (ops);
	141	int spufs_fd;
	142	CORE_ADDR spufs_addr;
	143
	144	/* This version applies only if we're currently in spu_run. */
	145	if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
	146	{
85e747d2 UW	147	ops_beneath->to_fetch_registers (ops_beneath, regcache, regno);
	148	return;
	149	}
	150
	151	/* We must be stopped on a spu_run system call. */
	152	if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
	153	return;
	154
	155	/* The ID register holds the spufs file handle. */
	156	if (regno == -1 \|\| regno == SPU_ID_REGNUM)
	157	{
e362b510	158	gdb_byte buf[4];
85e747d2 UW	159	store_unsigned_integer (buf, 4, byte_order, spufs_fd);
	160	regcache_raw_supply (regcache, SPU_ID_REGNUM, buf);
	161	}
	162
	163	/* The NPC register is found in PPC memory at SPUFS_ADDR. */
	164	if (regno == -1 \|\| regno == SPU_PC_REGNUM)
	165	{
e362b510	166	gdb_byte buf[4];
85e747d2 UW	167
	168	if (target_read (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
	169	buf, spufs_addr, sizeof buf) == sizeof buf)
	170	regcache_raw_supply (regcache, SPU_PC_REGNUM, buf);
	171	}
	172
	173	/* The GPRs are found in the "regs" spufs file. */
	174	if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_GPRS))
	175	{
e362b510 PA	176	gdb_byte buf[16 * SPU_NUM_GPRS];
e362b510 PA	177	char annex[32];
85e747d2 UW	178	int i;
	179
	180	xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
	181	if (target_read (ops_beneath, TARGET_OBJECT_SPU, annex,
	182	buf, 0, sizeof buf) == sizeof buf)
	183	for (i = 0; i < SPU_NUM_GPRS; i++)
	184	regcache_raw_supply (regcache, i, buf + i*16);
	185	}
	186	}
	187
	188	/* Override the to_store_registers routine. */
	189	static void
	190	spu_store_registers (struct target_ops *ops,
	191	struct regcache *regcache, int regno)
	192	{
	193	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	194	struct target_ops *ops_beneath = find_target_beneath (ops);
	195	int spufs_fd;
	196	CORE_ADDR spufs_addr;
	197
	198	/* This version applies only if we're currently in spu_run. */
	199	if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
	200	{
85e747d2 UW	201	ops_beneath->to_store_registers (ops_beneath, regcache, regno);
	202	return;
	203	}
	204
	205	/* We must be stopped on a spu_run system call. */
	206	if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
	207	return;
	208
	209	/* The NPC register is found in PPC memory at SPUFS_ADDR. */
	210	if (regno == -1 \|\| regno == SPU_PC_REGNUM)
	211	{
e362b510	212	gdb_byte buf[4];
85e747d2 UW	213	regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);
	214
	215	target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
	216	buf, spufs_addr, sizeof buf);
	217	}
	218
	219	/* The GPRs are found in the "regs" spufs file. */
	220	if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_GPRS))
	221	{
e362b510 PA	222	gdb_byte buf[16 * SPU_NUM_GPRS];
e362b510 PA	223	char annex[32];
85e747d2 UW	224	int i;
	225
	226	for (i = 0; i < SPU_NUM_GPRS; i++)
	227	regcache_raw_collect (regcache, i, buf + i*16);
	228
	229	xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
	230	target_write (ops_beneath, TARGET_OBJECT_SPU, annex,
	231	buf, 0, sizeof buf);
	232	}
	233	}
	234
	235	/* Override the to_xfer_partial routine. */
9b409511	236	static enum target_xfer_status
85e747d2 UW	237	spu_xfer_partial (struct target_ops *ops, enum target_object object,
85e747d2 UW	238	const char annex, gdb_byte readbuf,
9b409511 YQ	239	const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
9b409511 YQ	240	ULONGEST *xfered_len)
85e747d2 UW	241	{
85e747d2 UW	242	struct target_ops *ops_beneath = find_target_beneath (ops);
85e747d2 UW	243
	244	/* Use the "mem" spufs file to access SPU local store. */
	245	if (object == TARGET_OBJECT_MEMORY)
	246	{
	247	int fd = SPUADDR_SPU (offset);
	248	CORE_ADDR addr = SPUADDR_ADDR (offset);
d2ed6730 UW	249	char mem_annex[32], lslr_annex[32];
	250	gdb_byte buf[32];
	251	ULONGEST lslr;
9b409511	252	enum target_xfer_status ret;
85e747d2	253
d2ed6730	254	if (fd >= 0)
85e747d2 UW	255	{
85e747d2 UW	256	xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
d2ed6730 UW	257	ret = ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
d2ed6730 UW	258	mem_annex, readbuf, writebuf,
9b409511 YQ	259	addr, len, xfered_len);
9b409511 YQ	260	if (ret == TARGET_XFER_OK)
d2ed6730 UW	261	return ret;
	262
	263	/* SPU local store access wraps the address around at the
	264	local store limit. We emulate this here. To avoid needing
	265	an extra access to retrieve the LSLR, we only do that after
	266	trying the original address first, and getting end-of-file. */
	267	xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd);
	268	memset (buf, 0, sizeof buf);
	269	if (ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
	270	lslr_annex, buf, NULL,
9b409511 YQ	271	0, sizeof buf, xfered_len)
9b409511 YQ	272	!= TARGET_XFER_OK)
d2ed6730 UW	273	return ret;
d2ed6730 UW	274
001f13d8	275	lslr = strtoulst ((char *) buf, NULL, 16);
85e747d2 UW	276	return ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
85e747d2 UW	277	mem_annex, readbuf, writebuf,
9b409511	278	addr & lslr, len, xfered_len);
85e747d2 UW	279	}
	280	}
	281
	282	return ops_beneath->to_xfer_partial (ops_beneath, object, annex,
9b409511	283	readbuf, writebuf, offset, len, xfered_len);
85e747d2 UW	284	}
	285
	286	/* Override the to_search_memory routine. */
	287	static int
	288	spu_search_memory (struct target_ops* ops,
	289	CORE_ADDR start_addr, ULONGEST search_space_len,
	290	const gdb_byte *pattern, ULONGEST pattern_len,
	291	CORE_ADDR *found_addrp)
	292	{
	293	struct target_ops *ops_beneath = find_target_beneath (ops);
85e747d2	294
e75fdfca TT	295	/* For SPU local store, always fall back to the simple method. */
e75fdfca TT	296	if (SPUADDR_SPU (start_addr) >= 0)
85e747d2 UW	297	return simple_search_memory (ops,
	298	start_addr, search_space_len,
	299	pattern, pattern_len, found_addrp);
	300
	301	return ops_beneath->to_search_memory (ops_beneath,
	302	start_addr, search_space_len,
	303	pattern, pattern_len, found_addrp);
	304	}
	305
	306
	307	/* Push and pop the SPU multi-architecture support target. */
	308
	309	static void
	310	spu_multiarch_activate (void)
	311	{
	312	/* If GDB was configured without SPU architecture support,
	313	we cannot install SPU multi-architecture support either. */
	314	if (spu_gdbarch (-1) == NULL)
	315	return;
	316
	317	push_target (&spu_ops);
	318
	319	/* Make sure the thread architecture is re-evaluated. */
	320	registers_changed ();
	321	}
	322
	323	static void
	324	spu_multiarch_deactivate (void)
	325	{
	326	unpush_target (&spu_ops);
	327
	328	/* Make sure the thread architecture is re-evaluated. */
	329	registers_changed ();
	330	}
	331
	332	static void
	333	spu_multiarch_inferior_created (struct target_ops *ops, int from_tty)
	334	{
	335	if (spu_standalone_p ())
	336	spu_multiarch_activate ();
	337	}
	338
	339	static void
	340	spu_multiarch_solib_loaded (struct so_list *so)
	341	{
	342	if (!spu_standalone_p ())
	343	if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
	344	if (spu_nr_solib++ == 0)
	345	spu_multiarch_activate ();
	346	}
	347
	348	static void
	349	spu_multiarch_solib_unloaded (struct so_list *so)
	350	{
	351	if (!spu_standalone_p ())
	352	if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
	353	if (--spu_nr_solib == 0)
	354	spu_multiarch_deactivate ();
	355	}
	356
	357	static void
	358	spu_mourn_inferior (struct target_ops *ops)
	359	{
	360	struct target_ops *ops_beneath = find_target_beneath (ops);
85e747d2	361
85e747d2 UW	362	ops_beneath->to_mourn_inferior (ops_beneath);
	363	spu_multiarch_deactivate ();
	364	}
	365
	366
	367	/* Initialize the SPU multi-architecture support target. */
	368
	369	static void
	370	init_spu_ops (void)
	371	{
	372	spu_ops.to_shortname = "spu";
	373	spu_ops.to_longname = "SPU multi-architecture support.";
	374	spu_ops.to_doc = "SPU multi-architecture support.";
	375	spu_ops.to_mourn_inferior = spu_mourn_inferior;
	376	spu_ops.to_fetch_registers = spu_fetch_registers;
	377	spu_ops.to_store_registers = spu_store_registers;
	378	spu_ops.to_xfer_partial = spu_xfer_partial;
	379	spu_ops.to_search_memory = spu_search_memory;
	380	spu_ops.to_region_ok_for_hw_watchpoint = spu_region_ok_for_hw_watchpoint;
	381	spu_ops.to_thread_architecture = spu_thread_architecture;
	382	spu_ops.to_stratum = arch_stratum;
	383	spu_ops.to_magic = OPS_MAGIC;
	384	}
	385
693be288 JK	386	/* -Wmissing-prototypes */
	387	extern initialize_file_ftype _initialize_spu_multiarch;
	388
85e747d2 UW	389	void
	390	_initialize_spu_multiarch (void)
	391	{
	392	/* Install ourselves on the target stack. */
	393	init_spu_ops ();
12070676	394	complete_target_initialization (&spu_ops);
85e747d2 UW	395
	396	/* Install observers to watch for SPU objects. */
	397	observer_attach_inferior_created (spu_multiarch_inferior_created);
	398	observer_attach_solib_loaded (spu_multiarch_solib_loaded);
	399	observer_attach_solib_unloaded (spu_multiarch_solib_unloaded);
	400	}
	401