2009-02-04 Tristan Gingold <gingold@adacore.com>

	* machoread.c (macho_symfile_read): Read minsymtab also from
	shared libraries.
	(macho_symfile_read): Try to read dwarf2 frame info from main
	object file, but not from OSO files.
	(macho_symfile_offsets): Update section names for latest BFD
	changes.
	* i386-darwin-tdep.c (i386_darwin_init_abi): Call set_solib_ops.
	(x86_darwin_init_abi_64): Ditto.
	* solib-darwin.c: New file.
	* solib-darwin.h: New file.
	* configure.tgt: Add solib.o solib-darwin.o for Darwin.

1 files changed, 450 insertions, 0 deletions

diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
new file mode 100644
index 0000000..3305804
--- /dev/null
+++ b/gdb/solib-darwin.c
@@ -0,0 +1,450 @@
+/* Handle Darwin shared libraries for GDB, the GNU Debugger.
+
+   Copyright (C) 2009 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 "symtab.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "inferior.h"
+#include "gdbthread.h"
+
+#include "gdb_assert.h"
+
+#include "solist.h"
+#include "solib.h"
+#include "solib-svr4.h"
+
+#include "bfd-target.h"
+#include "elf-bfd.h"
+#include "exec.h"
+#include "auxv.h"
+#include "exceptions.h"
+#include "mach-o.h"
+
+struct gdb_dyld_image_info
+{
+  /* Base address (which corresponds to the Mach-O header).  */
+  CORE_ADDR mach_header;
+  /* Image file path.  */
+  CORE_ADDR file_path;
+  /* st.m_time of image file.  */
+  unsigned long mtime;
+};
+
+/* Content of inferior dyld_all_image_infos structure.  */
+struct gdb_dyld_all_image_infos
+{
+  /* Version (1).  */
+  unsigned int version;
+  /* Number of images.  */
+  unsigned int count;
+  /* Image description.  */
+  CORE_ADDR info;
+  /* Notifier (function called when a library is added or removed).  */
+  CORE_ADDR notifier;
+};
+
+/* Current all_image_infos version.  */
+#define DYLD_VERSION 1
+
+/* Address of structure dyld_all_image_infos in inferior.  */
+static CORE_ADDR dyld_all_image_addr;
+
+/* Gdb copy of dyld_all_info_infos.  */
+static struct gdb_dyld_all_image_infos dyld_all_image;
+
+/* Read dyld_all_image from inferior.  */
+static void
+darwin_load_image_infos (void)
+{
+  gdb_byte buf[24];
+  struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+  int len;
+
+  /* If the structure address is not known, don't continue.  */
+  if (dyld_all_image_addr == 0)
+    return;
+
+  /* The structure has 4 fields: version (4 bytes), count (4 bytes),
+     info (pointer) and notifier (pointer).  */
+  len = 4 + 4 + 2 * ptr_type->length;
+  gdb_assert (len <= sizeof (buf));
+  memset (&dyld_all_image, 0, sizeof (dyld_all_image));
+
+  /* Read structure raw bytes from target.  */
+  if (target_read_memory (dyld_all_image_addr, buf, len))
+    return;
+
+  /* Extract the fields.  */
+  dyld_all_image.version = extract_unsigned_integer (buf, 4);
+  if (dyld_all_image.version != DYLD_VERSION)
+    return;
+
+  dyld_all_image.count = extract_unsigned_integer (buf + 4, 4);
+  dyld_all_image.info = extract_typed_address (buf + 8, ptr_type);
+  dyld_all_image.notifier = extract_typed_address
+    (buf + 8 + ptr_type->length, ptr_type);
+}
+
+/* Link map info to include in an allocated so_list entry.  */
+
+struct lm_info
+{
+  /* The target location of lm.  */
+  CORE_ADDR lm_addr;
+};
+
+struct darwin_so_list
+{
+  /* Common field.  */
+  struct so_list sl;
+  /* Darwin specific data.  */
+  struct lm_info li;
+};
+
+/* Lookup the value for a specific symbol.  */
+static CORE_ADDR
+lookup_symbol_from_bfd (bfd *abfd, char *symname)
+{
+  long storage_needed;
+  asymbol **symbol_table;
+  unsigned int number_of_symbols;
+  unsigned int i;
+  CORE_ADDR symaddr = 0;
+
+  storage_needed = bfd_get_symtab_upper_bound (abfd);
+
+  if (storage_needed <= 0)
+    return 0;
+
+  symbol_table = (asymbol **) xmalloc (storage_needed);
+  number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+  
+  for (i = 0; i < number_of_symbols; i++)
+    {
+      asymbol *sym = symbol_table[i];
+      if (strcmp (sym->name, symname) == 0
+	  && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0)
+	{
+	  /* BFD symbols are section relative.  */
+	  symaddr = sym->value + sym->section->vma;
+	  break;
+	}
+    }
+  xfree (symbol_table);
+
+  return symaddr;
+}
+
+/* Return program interpreter string.  */
+static gdb_byte *
+find_program_interpreter (void)
+{
+  gdb_byte *buf = NULL;
+
+  /* If we have an exec_bfd, use its section table.  */
+  if (exec_bfd)
+    {
+      struct bfd_section *dylinker_sect;
+      
+      dylinker_sect = bfd_get_section_by_name (exec_bfd, "LC_LOAD_DYLINKER");
+      if (dylinker_sect != NULL)
+	{
+	  int sect_size = bfd_section_size (exec_bfd, dylinker_sect);
+
+	  buf = xmalloc (sect_size);
+	  if (bfd_get_section_contents (exec_bfd, dylinker_sect,
+					buf, 0, sect_size))
+	    return buf;
+	  xfree (buf);
+	}
+    }
+
+  /* If we didn't find it, read from memory.
+     FIXME: todo.  */
+  return buf;
+}
+
+/*  Not used.  I don't see how the main symbol file can be found: the
+    interpreter name is needed and it is known from the executable file.
+    Note that darwin-nat.c implements pid_to_exec_file.  */
+static int
+open_symbol_file_object (void *from_ttyp)
+{
+  return 0;
+}
+
+/* Build a list of currently loaded shared objects.  See solib-svr4.c  */
+static struct so_list *
+darwin_current_sos (void)
+{
+  struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+  int ptr_len = TYPE_LENGTH (ptr_type);
+  unsigned int image_info_size;
+  CORE_ADDR lm;
+  struct so_list *head = NULL;
+  struct so_list *tail = NULL;
+  int i;
+
+  /* Be sure image infos are loaded.  */
+  darwin_load_image_infos ();
+
+  if (dyld_all_image.version != DYLD_VERSION)
+    return NULL;
+
+  image_info_size = ptr_len * 3;
+
+  /* Read infos for each solib.
+     This first entry is ignored as this is the executable itself.  */
+  for (i = 1; i < dyld_all_image.count; i++)
+    {
+      CORE_ADDR info = dyld_all_image.info + i * image_info_size;
+      char buf[image_info_size];
+      CORE_ADDR load_addr;
+      CORE_ADDR path_addr;
+      char *file_path;
+      int errcode;
+      struct darwin_so_list *dnew;
+      struct so_list *new;
+      struct cleanup *old_chain;
+
+      /* Read image info from inferior.  */
+      if (target_read_memory (info, buf, image_info_size))
+	break;
+
+      load_addr = extract_typed_address (buf, ptr_type);
+      path_addr = extract_typed_address (buf + ptr_len, ptr_type);
+
+      target_read_string (path_addr, &file_path,
+			  SO_NAME_MAX_PATH_SIZE - 1, &errcode);
+      if (errcode)
+	break;
+
+      /* Create and fill the new so_list element.  */
+      dnew = XZALLOC (struct darwin_so_list);
+      new = &dnew->sl;
+      old_chain = make_cleanup (xfree, dnew);
+
+      new->lm_info = &dnew->li;
+
+      strncpy (new->so_name, file_path, SO_NAME_MAX_PATH_SIZE - 1);
+      new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
+      strcpy (new->so_original_name, new->so_name);
+      xfree (file_path);
+      new->lm_info->lm_addr = load_addr;
+
+      if (head == NULL)
+	head = new;
+      else
+	tail->next = new;
+      tail = new;
+
+      discard_cleanups (old_chain);
+    }
+
+  return head;
+}
+
+/* Return 1 if PC lies in the dynamic symbol resolution code of the
+   run time loader.  */
+int
+darwin_in_dynsym_resolve_code (CORE_ADDR pc)
+{
+  return 0;
+}
+
+
+/* No special symbol handling.  */
+static void
+darwin_special_symbol_handling (void)
+{
+}
+
+/* Shared library startup support.  See documentation in solib-svr4.c  */
+static void
+darwin_solib_create_inferior_hook (void)
+{
+  struct minimal_symbol *msymbol;
+  char **bkpt_namep;
+  asection *interp_sect;
+  gdb_byte *interp_name;
+  CORE_ADDR sym_addr;
+  CORE_ADDR load_addr = 0;
+  int load_addr_found = 0;
+  int loader_found_in_list = 0;
+  struct so_list *so;
+  bfd *dyld_bfd = NULL;
+  struct inferior *inf = current_inferior ();
+
+  /* First, remove all the solib event breakpoints.  Their addresses
+     may have changed since the last time we ran the program.  */
+  remove_solib_event_breakpoints ();
+
+  /* Find the program interpreter.  */
+  interp_name = find_program_interpreter ();
+  if (!interp_name)
+    return;
+
+  /* Create a bfd for the interpreter.  */
+  sym_addr = 0;
+  dyld_bfd = bfd_openr (interp_name, gnutarget);
+  if (dyld_bfd)
+    {
+      bfd *sub;
+      sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object,
+				    gdbarch_bfd_arch_info (current_gdbarch));
+      if (sub)
+	dyld_bfd = sub;
+      else
+	{
+	  bfd_close (dyld_bfd);
+	  dyld_bfd = NULL;
+	}
+    }
+  if (!dyld_bfd)
+    {
+      xfree (interp_name);
+      return;
+    }
+
+  if (!inf->attach_flag)
+    {
+      /* We find the dynamic linker's base address by examining
+	 the current pc (which should point at the entry point for the
+	 dynamic linker) and subtracting the offset of the entry point.  */
+      load_addr = (read_pc () - bfd_get_start_address (dyld_bfd));
+    }
+  else
+    {
+      /* FIXME: todo.
+	 Get address of __DATA.__dyld in exec_bfd, read address at offset 0
+      */
+      xfree (interp_name);
+      return;
+    }
+
+  /* Now try to set a breakpoint in the dynamic linker.  */
+  dyld_all_image_addr =
+    lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos");
+  
+  bfd_close (dyld_bfd);
+  xfree (interp_name);
+
+  if (dyld_all_image_addr == 0)
+    return;
+
+  dyld_all_image_addr += load_addr;
+
+  darwin_load_image_infos ();
+
+  if (dyld_all_image.version == DYLD_VERSION)
+    create_solib_event_breakpoint (dyld_all_image.notifier);
+}
+
+static void
+darwin_clear_solib (void)
+{
+  dyld_all_image_addr = 0;
+  dyld_all_image.version = 0;
+}
+
+static void
+darwin_free_so (struct so_list *so)
+{
+}
+
+/* The section table is built from bfd sections using bfd VMAs.
+   Relocate these VMAs according to solib info.  */
+static void
+darwin_relocate_section_addresses (struct so_list *so,
+				   struct section_table *sec)
+{
+  sec->addr += so->lm_info->lm_addr;
+  sec->endaddr += so->lm_info->lm_addr;
+
+  /* Best effort to set addr_high/addr_low.  This is used only by
+     'info sharedlibary'.  */
+  if (so->addr_high == 0)
+    {
+      so->addr_low = sec->addr;
+      so->addr_high = sec->endaddr;
+    }
+  if (sec->endaddr > so->addr_high)
+    so->addr_high = sec->endaddr;
+  if (sec->addr < so->addr_low)
+    so->addr_low = sec->addr;
+}
+
+static struct symbol *
+darwin_lookup_lib_symbol (const struct objfile *objfile,
+			  const char *name,
+			  const char *linkage_name,
+			  const domain_enum domain)
+{
+  return NULL;
+}
+
+static bfd *
+darwin_bfd_open (char *pathname)
+{
+  char *found_pathname;
+  int found_file;
+  bfd *abfd;
+  bfd *res;
+
+  /* Search for shared library file.  */
+  found_pathname = solib_find (pathname, &found_file);
+  if (found_pathname == NULL)
+    perror_with_name (pathname);
+
+  /* Open bfd for shared library.  */
+  abfd = solib_bfd_fopen (found_pathname, found_file);
+
+  res = bfd_mach_o_fat_extract (abfd, bfd_object,
+				gdbarch_bfd_arch_info (current_gdbarch));
+  if (!res)
+    {
+      bfd_close (abfd);
+      make_cleanup (xfree, found_pathname);
+      error (_("`%s': not a shared-library: %s"),
+	     found_pathname, bfd_errmsg (bfd_get_error ()));
+    }
+  return res;
+}
+
+struct target_so_ops darwin_so_ops;
+
+void
+_initialize_darwin_solib (void)
+{
+  darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses;
+  darwin_so_ops.free_so = darwin_free_so;
+  darwin_so_ops.clear_solib = darwin_clear_solib;
+  darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook;
+  darwin_so_ops.special_symbol_handling = darwin_special_symbol_handling;
+  darwin_so_ops.current_sos = darwin_current_sos;
+  darwin_so_ops.open_symbol_file_object = open_symbol_file_object;
+  darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code;
+  darwin_so_ops.lookup_lib_global_symbol = darwin_lookup_lib_symbol;
+  darwin_so_ops.bfd_open = darwin_bfd_open;
+}