ChangeLog:

	* target.h (enum strata): New value arch_stratum.
	* target.c (target_require_runnable): Skip arch_stratum targets.

	* configure.tgt (powerpc-*-linux* | powerpc64-*-linux*): Add
	solib-spu.o and spu-multiarch.o to gdb_target_obs.
	* Makefile.in (ALL_TARGET_OBS): Add solib-spu.o and spu-multiarch.o.
	(ALLDEPFILES): Add solib-spu.c and spu-multiarch.c.

	* solib-spu.c: New file.
	* solib-spu.h: New file.
	* spu-multiarch.c: New file.

	* spu-tdep.h (SPUADDR, SPUADDR_SPU, SPUADDR_ADDR): New macros.

	* spu-tdep.c (struct gdbarch_tdep): New member id.
	(spu_gdbarch_id): New function.
	(spu_lslr): New function.

	(spu_address_to_pointer): New function.
	(spu_pointer_to_address): Support SPU ID address encoding.  Use
	spu_gdbarch_id and spu_lslr.
	(spu_integer_to_address): Likewise.
	(spu_frame_unwind_cache): Update for encoded addresses.
	(spu_unwind_pc, spu_unwind_sp): Likewise.
	(spu_read_pc, spu_write_pc): Likewise.
	(spu_push_dummy_call): Likewise.
	(spu_software_single_step): Likewise.
	(spu_get_longjmp_target): Likewise.
	(spu_overlay_update_osect): Likewise.

	(spu_dis_asm_print_address): New function.
	(gdb_print_insn_spu): Likewise.

	(spu_gdbarch_init): Store SPU ID in tdep structure.
	Install spu_address_to_pointer and gdb_print_insn_spu.

	* ppc-linux-tdep.c: Include "observer.h", "auxv.h", "elf/common.h"
	and "solib-spu.h".
	(ppc_linux_entry_point_addr): New static variable.
	(ppc_linux_inferior_created): New function.
	(ppc_linux_displaced_step_location): Likewise.
	(ppc_linux_init_abi): Enable Cell/B.E. support if supported
	by the target.
	(_initialize_ppc_linux_tdep): Attach to inferior_created observer.

	* NEWS: Mention multi-architecture and Cell/B.E. debugging
	capabilities.

testsuite/ChangeLog:

	* gdb.xml/tdesc-regs.exp: Skip for SPU targets.

1 files changed, 455 insertions, 0 deletions

diff --git a/gdb/solib-spu.c b/gdb/solib-spu.c
new file mode 100644
index 00000000000..19e3212a200
--- /dev/null
+++ b/gdb/solib-spu.c
@@ -0,0 +1,455 @@
+/* Cell SPU GNU/Linux support -- shared library handling.
+   Copyright (C) 2009 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 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "gdb_stat.h"
+#include "arch-utils.h"
+#include "bfd.h"
+#include "symtab.h"
+#include "solib.h"
+#include "solib-svr4.h"
+#include "solist.h"
+#include "inferior.h"
+#include "objfiles.h"
+#include "observer.h"
+#include "breakpoint.h"
+#include "gdbthread.h"
+
+#include "spu-tdep.h"
+
+/* Highest SPE id (file handle) the inferior may have.  */
+#define MAX_SPE_FD 1024
+
+/* Stand-alone SPE executable?  */
+#define spu_standalone_p() \
+  (symfile_objfile && symfile_objfile->obfd \
+   && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu)
+
+
+/* Relocate main SPE executable.  */
+static void
+spu_relocate_main_executable (int spufs_fd)
+{
+  struct objfile *objfile;
+  struct cleanup *old_chain;
+  struct section_offsets *new_offsets;
+  int i;
+
+  for (objfile = symfile_objfile;
+       objfile;
+       objfile = objfile->separate_debug_objfile)
+    {
+      new_offsets = xcalloc (objfile->num_sections,
+			     sizeof (struct section_offsets));
+      old_chain = make_cleanup (xfree, new_offsets);
+
+      for (i = 0; i < objfile->num_sections; i++)
+        new_offsets->offsets[i] = SPUADDR (spufs_fd, 0);
+
+      objfile_relocate (objfile, new_offsets);
+      do_cleanups (old_chain);
+    }
+}
+
+/* When running a stand-alone SPE executable, we may need to skip one more
+   exec event on startup, to get past the binfmt_misc loader.  */
+static void
+spu_skip_standalone_loader (void)
+{
+  if (target_has_execution && !current_inferior ()->attach_flag)
+    {
+      struct target_waitstatus ws;
+
+      /* Only some kernels report an extra SIGTRAP with the binfmt_misc
+	 loader; others do not.  In addition, if we have attached to an
+	 already running inferior instead of starting a new one, we will
+	 not see the extra SIGTRAP -- and we cannot readily distinguish
+	 the two cases, in particular with the extended-remote target.
+
+	 Thus we issue a single-step here.  If no extra SIGTRAP was pending,
+	 this will step past the first instruction of the stand-alone SPE
+	 executable loader, but we don't care about that.  */
+
+      inferior_thread ()->in_infcall = 1;   /* Suppress MI messages.  */
+
+      target_resume (inferior_ptid, 1, TARGET_SIGNAL_0);
+      target_wait (minus_one_ptid, &ws, 0);
+      set_executing (minus_one_ptid, 0);
+
+      inferior_thread ()->in_infcall = 0;
+    }
+}
+
+/* Build a list of `struct so_list' objects describing the shared
+   objects currently loaded in the inferior.  */
+static struct so_list *
+spu_current_sos (void)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+  struct so_list *head;
+  struct so_list **link_ptr;
+
+  char buf[MAX_SPE_FD * 4];
+  int i, size;
+
+  /* First, retrieve the SVR4 shared library list.  */
+  head = svr4_so_ops.current_sos ();
+
+  /* Append our libraries to the end of the list.  */
+  for (link_ptr = &head; *link_ptr; link_ptr = &(*link_ptr)->next)
+    ;
+
+  /* Determine list of SPU ids.  */
+  size = target_read (&current_target, TARGET_OBJECT_SPU, NULL,
+		      buf, 0, sizeof buf);
+
+  /* Do not add stand-alone SPE executable context as shared library,
+     but relocate main SPE executable objfile.  */
+  if (spu_standalone_p ())
+    {
+      if (size == 4)
+	{
+	  int fd = extract_unsigned_integer (buf, 4, byte_order);
+	  spu_relocate_main_executable (fd);
+
+	  /* Re-enable breakpoints after main SPU context was established;
+	     see also comments in spu_solib_create_inferior_hook.  */
+	  enable_breakpoints_after_startup ();
+	}
+
+      return head;
+    }
+
+  /* Create an so_list entry for each SPU id.  */
+  for (i = 0; i < size; i += 4)
+    {
+      int fd = extract_unsigned_integer (buf + i, 4, byte_order);
+      struct so_list *new;
+
+      unsigned long long addr;
+      char annex[32], id[100];
+      int len;
+
+      /* Read object ID.  There's a race window where the inferior may have
+	 already created the SPE context, but not installed the object-id
+	 yet.  Skip such entries; we'll be back for them later.  */
+      xsnprintf (annex, sizeof annex, "%d/object-id", fd);
+      len = target_read (&current_target, TARGET_OBJECT_SPU, annex,
+			 id, 0, sizeof id);
+      if (len <= 0 || len >= sizeof id)
+	continue;
+      id[len] = 0;
+      if (sscanf (id, "0x%llx", &addr) != 1 || !addr)
+	continue;
+
+      /* Allocate so_list structure.  */
+      new = XZALLOC (struct so_list);
+
+      /* Encode FD and object ID in path name.  Choose the name so as not
+	 to conflict with any (normal) SVR4 library path name.  */
+      xsnprintf (new->so_name, sizeof new->so_name, "@0x%llx <%d>", addr, fd);
+      strcpy (new->so_original_name, new->so_name);
+
+      *link_ptr = new;
+      link_ptr = &new->next;
+    }
+
+  return head;
+}
+
+/* Free so_list information.  */
+static void
+spu_free_so (struct so_list *so)
+{
+  if (so->so_original_name[0] != '@')
+    svr4_so_ops.free_so (so);
+}
+
+/* Relocate section addresses.  */
+static void
+spu_relocate_section_addresses (struct so_list *so,
+				struct target_section *sec)
+{
+  if (so->so_original_name[0] != '@')
+    svr4_so_ops.relocate_section_addresses (so, sec);
+  else
+    {
+      unsigned long long addr;
+      int fd;
+
+      /* Set addr_low/high to just LS offset for display.  */
+      if (so->addr_low == 0 && so->addr_high == 0
+          && strcmp (sec->the_bfd_section->name, ".text") == 0)
+        {
+          so->addr_low = sec->addr;
+          so->addr_high = sec->endaddr;
+        }
+
+      /* Decode object ID.  */
+      if (sscanf (so->so_original_name, "@0x%llx <%d>", &addr, &fd) != 2)
+	internal_error (__FILE__, __LINE__, "bad object ID");
+
+      sec->addr = SPUADDR (fd, sec->addr);
+      sec->endaddr = SPUADDR (fd, sec->endaddr);
+    }
+}
+
+
+/* Inferior memory should contain an SPE executable image at location ADDR.
+   Allocate a BFD representing that executable.  Return NULL on error.  */
+
+static void *
+spu_bfd_iovec_open (bfd *nbfd, void *open_closure)
+{
+  return open_closure;
+}
+
+static int
+spu_bfd_iovec_close (bfd *nbfd, void *stream)
+{
+  xfree (stream);
+  return 1;
+}
+
+static file_ptr
+spu_bfd_iovec_pread (bfd *abfd, void *stream, void *buf,
+                     file_ptr nbytes, file_ptr offset)
+{
+  CORE_ADDR addr = *(CORE_ADDR *)stream;
+  int ret;
+
+  ret = target_read_memory (addr + offset, buf, nbytes);
+  if (ret != 0)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return -1;
+    }
+
+  return nbytes;
+}
+
+static int
+spu_bfd_iovec_stat (bfd *abfd, void *stream, struct stat *sb)
+{
+  /* We don't have an easy way of finding the size of embedded spu
+     images.  We could parse the in-memory ELF header and section
+     table to find the extent of the last section but that seems
+     pointless when the size is needed only for checks of other
+     parsed values in dbxread.c.  */
+  sb->st_size = INT_MAX;
+  return 0;
+}
+
+static bfd *
+spu_bfd_fopen (char *name, CORE_ADDR addr)
+{
+  bfd *nbfd;
+
+  CORE_ADDR *open_closure = xmalloc (sizeof (CORE_ADDR));
+  *open_closure = addr;
+
+  nbfd = bfd_openr_iovec (xstrdup (name), "elf32-spu",
+                          spu_bfd_iovec_open, open_closure,
+                          spu_bfd_iovec_pread, spu_bfd_iovec_close,
+			  spu_bfd_iovec_stat);
+  if (!nbfd)
+    return NULL;
+
+  if (!bfd_check_format (nbfd, bfd_object))
+    {
+      bfd_close (nbfd);
+      return NULL;
+    }
+
+  return nbfd;
+}
+
+/* Open shared library BFD.  */
+static bfd *
+spu_bfd_open (char *pathname)
+{
+  char *original_name = strrchr (pathname, '@');
+  bfd *abfd;
+  asection *spu_name;
+  unsigned long long addr;
+  int fd;
+
+  /* Handle regular SVR4 libraries.  */
+  if (!original_name)
+    return svr4_so_ops.bfd_open (pathname);
+
+  /* Decode object ID.  */
+  if (sscanf (original_name, "@0x%llx <%d>", &addr, &fd) != 2)
+    internal_error (__FILE__, __LINE__, "bad object ID");
+
+  /* Open BFD representing SPE executable.  */
+  abfd = spu_bfd_fopen (original_name, (CORE_ADDR) addr);
+  if (!abfd)
+    error (_("Cannot read SPE executable at %s"), original_name);
+
+  /* Retrieve SPU name note.  */
+  spu_name = bfd_get_section_by_name (abfd, ".note.spu_name");
+  if (spu_name)
+    {
+      int sect_size = bfd_section_size (abfd, spu_name);
+      if (sect_size > 20)
+	{
+	  char *buf = alloca (sect_size - 20 + strlen (original_name) + 1);
+	  bfd_get_section_contents (abfd, spu_name, buf, 20, sect_size - 20);
+	  buf[sect_size - 20] = '\0';
+
+	  strcat (buf, original_name);
+
+	  xfree ((char *)abfd->filename);
+	  abfd->filename = xstrdup (buf);
+	}
+    }
+
+  return abfd;
+}
+
+/* Lookup global symbol in a SPE executable.  */
+static struct symbol *
+spu_lookup_lib_symbol (const struct objfile *objfile,
+		       const char *name,
+		       const char *linkage_name,
+		       const domain_enum domain)
+{
+  if (bfd_get_arch (objfile->obfd) == bfd_arch_spu)
+    return lookup_global_symbol_from_objfile (objfile, name, linkage_name,
+					      domain);
+
+  if (svr4_so_ops.lookup_lib_global_symbol != NULL)
+    return svr4_so_ops.lookup_lib_global_symbol (objfile, name, linkage_name,
+						 domain);
+  return NULL;
+}
+
+/* Enable shared library breakpoint.  */
+static int
+spu_enable_break (struct objfile *objfile)
+{
+  struct minimal_symbol *spe_event_sym = NULL;
+
+  /* The libspe library will call __spe_context_update_event whenever any
+     SPE context is allocated or destroyed.  */
+  spe_event_sym = lookup_minimal_symbol ("__spe_context_update_event",
+					 NULL, objfile);
+
+  /* Place a solib_event breakpoint on the symbol.  */
+  if (spe_event_sym)
+    {
+      CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (spe_event_sym);
+      addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, addr,
+                                                 &current_target);
+      create_solib_event_breakpoint (target_gdbarch, addr);
+      return 1;
+    }
+
+  return 0;
+}
+
+/* Create inferior hook.  */
+static void
+spu_solib_create_inferior_hook (void)
+{
+  /* Remove all previously installed solib breakpoints.  Both the SVR4
+     code and us will re-install all required breakpoints.  */
+  remove_solib_event_breakpoints ();
+
+  /* Handle SPE stand-alone executables.  */
+  if (spu_standalone_p ())
+    {
+      /* After an SPE stand-alone executable was loaded, we'll receive
+	 an additional trap due to the binfmt_misc handler.  Make sure
+	 to skip that trap.  */
+      spu_skip_standalone_loader ();
+
+      /* If the user established breakpoints before starting the inferior, GDB
+	 would attempt to insert those now.  This would fail because the SPU
+	 context has not yet been created and the SPU executable has not yet
+	 been loaded.  To prevent such failures, we disable all user-created
+	 breakpoints now; they will be re-enabled in spu_current_sos once the
+	 main SPU context has been detected.  */
+      disable_breakpoints_before_startup ();
+
+      /* A special case arises when re-starting an executable, because at
+	 this point it still resides at the relocated address range that was
+	 determined during its last execution.  We need to undo the relocation
+	 so that that multi-architecture target recognizes the stand-alone
+	 initialization special case.  */
+      spu_relocate_main_executable (-1);
+    }
+
+  /* Call SVR4 hook -- this will re-insert the SVR4 solib breakpoints.  */
+  svr4_so_ops.solib_create_inferior_hook ();
+
+  /* If the inferior is statically linked against libspe, we need to install
+     our own solib breakpoint right now.  Otherwise, it will be installed by
+     the solib_loaded observer below as soon as libspe is loaded.  */
+  spu_enable_break (NULL);
+}
+
+/* Install SPE "shared library" handling.  This is called by -tdep code
+   that wants to support SPU as a secondary architecture.  */
+void
+set_spu_solib_ops (struct gdbarch *gdbarch)
+{
+  static struct target_so_ops spu_so_ops;
+
+  /* Initialize this lazily, to avoid an initialization order
+     dependency on solib-svr4.c's _initialize routine.  */
+  if (spu_so_ops.current_sos == NULL)
+    {
+      spu_so_ops = svr4_so_ops;
+      spu_so_ops.solib_create_inferior_hook = spu_solib_create_inferior_hook;
+      spu_so_ops.relocate_section_addresses = spu_relocate_section_addresses;
+      spu_so_ops.free_so = spu_free_so;
+      spu_so_ops.current_sos = spu_current_sos;
+      spu_so_ops.bfd_open = spu_bfd_open;
+      spu_so_ops.lookup_lib_global_symbol = spu_lookup_lib_symbol;
+    }
+
+  set_solib_ops (gdbarch, &spu_so_ops);
+}
+
+/* Observer for the solib_loaded event.  Used to install our breakpoint
+   if libspe is a shared library.  */
+static void
+spu_solib_loaded (struct so_list *so)
+{
+  if (strstr (so->so_original_name, "/libspe") != NULL)
+    {
+      solib_read_symbols (so, so->from_tty ? SYMFILE_VERBOSE : 0);
+      spu_enable_break (so->objfile);
+    }
+}
+
+void
+_initialize_spu_solib (void)
+{
+  observer_attach_solib_loaded (spu_solib_loaded);
+}
+