X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fsolib-darwin.c;h=c4c6308cf251934cf525ce0d5ced370f542cfe3a;hb=9daf7bab4f17d991098169b448e30d575c87b36d;hp=d93d0259b7f9cdc621b5ea1c77eb740a44e3e71d;hpb=066d7383accb1d6e19bcccd370d8c05b97483378;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
index d93d0259b7..c4c6308cf2 100644
--- a/gdb/solib-darwin.c
+++ b/gdb/solib-darwin.c
@@ -1,6 +1,6 @@
 /* Handle Darwin shared libraries for GDB, the GNU Debugger.
 
-   Copyright (C) 2009 Free Software Foundation, Inc.
+   Copyright (C) 2009-2013 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -28,6 +28,7 @@
 #include "inferior.h"
 #include "regcache.h"
 #include "gdbthread.h"
+#include "gdb_bfd.h"
 
 #include "gdb_assert.h"
 
@@ -41,6 +42,7 @@
 #include "auxv.h"
 #include "exceptions.h"
 #include "mach-o.h"
+#include "mach-o/external.h"
 
 struct gdb_dyld_image_info
 {
@@ -68,55 +70,89 @@ struct gdb_dyld_all_image_infos
 
 /* Current all_image_infos version.  */
 #define DYLD_VERSION_MIN 1
-#define DYLD_VERSION_MAX 7
+#define DYLD_VERSION_MAX 12
 
-/* Address of structure dyld_all_image_infos in inferior.  */
-static CORE_ADDR dyld_all_image_addr;
+/* Per PSPACE specific data.  */
+struct darwin_info
+{
+  /* Address of structure dyld_all_image_infos in inferior.  */
+  CORE_ADDR all_image_addr;
+
+  /* Gdb copy of dyld_all_info_infos.  */
+  struct gdb_dyld_all_image_infos all_image;
+};
+
+/* Per-program-space data key.  */
+static const struct program_space_data *solib_darwin_pspace_data;
+
+static void
+darwin_pspace_data_cleanup (struct program_space *pspace, void *arg)
+{
+  struct darwin_info *info;
+
+  info = program_space_data (pspace, solib_darwin_pspace_data);
+  xfree (info);
+}
+
+/* Get the current darwin data.  If none is found yet, add it now.  This
+   function always returns a valid object.  */
+
+static struct darwin_info *
+get_darwin_info (void)
+{
+  struct darwin_info *info;
 
-/* Gdb copy of dyld_all_info_infos.  */
-static struct gdb_dyld_all_image_infos dyld_all_image;
+  info = program_space_data (current_program_space, solib_darwin_pspace_data);
+  if (info != NULL)
+    return info;
+
+  info = XZALLOC (struct darwin_info);
+  set_program_space_data (current_program_space,
+			  solib_darwin_pspace_data, info);
+  return info;
+}
 
 /* Return non-zero if the version in dyld_all_image is known.  */
 
 static int
-darwin_dyld_version_ok (void)
+darwin_dyld_version_ok (const struct darwin_info *info)
 {
-  return dyld_all_image.version >= DYLD_VERSION_MIN
-    && dyld_all_image.version >= DYLD_VERSION_MAX;
+  return info->all_image.version >= DYLD_VERSION_MIN
+    && info->all_image.version <= DYLD_VERSION_MAX;
 }
 
 /* Read dyld_all_image from inferior.  */
 
 static void
-darwin_load_image_infos (void)
+darwin_load_image_infos (struct darwin_info *info)
 {
   gdb_byte buf[24];
-  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
-  struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
+  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)
+  if (info->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));
+  memset (&info->all_image, 0, sizeof (info->all_image));
 
   /* Read structure raw bytes from target.  */
-  if (target_read_memory (dyld_all_image_addr, buf, len))
+  if (target_read_memory (info->all_image_addr, buf, len))
     return;
 
   /* Extract the fields.  */
-  dyld_all_image.version = extract_unsigned_integer (buf, 4, byte_order);
-  if (!darwin_dyld_version_ok ())
+  info->all_image.version = extract_unsigned_integer (buf, 4, byte_order);
+  if (!darwin_dyld_version_ok (info))
     return;
 
-  dyld_all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order);
-  dyld_all_image.info = extract_typed_address (buf + 8, ptr_type);
-  dyld_all_image.notifier = extract_typed_address
+  info->all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order);
+  info->all_image.info = extract_typed_address (buf + 8, ptr_type);
+  info->all_image.notifier = extract_typed_address
     (buf + 8 + ptr_type->length, ptr_type);
 }
 
@@ -154,10 +190,11 @@ lookup_symbol_from_bfd (bfd *abfd, char *symname)
 
   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)
 	{
@@ -173,16 +210,16 @@ lookup_symbol_from_bfd (bfd *abfd, char *symname)
 
 /* Return program interpreter string.  */
 
-static gdb_byte *
+static char *
 find_program_interpreter (void)
 {
-  gdb_byte *buf = NULL;
+  char *buf = NULL;
 
   /* If we have an exec_bfd, get the interpreter from the load commands.  */
   if (exec_bfd)
     {
       bfd_mach_o_load_command *cmd;
-      
+
       if (bfd_mach_o_lookup_command (exec_bfd,
                                      BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1)
         return cmd->command.dylinker.name_str;
@@ -203,35 +240,40 @@ open_symbol_file_object (void *from_ttyp)
   return 0;
 }
 
-/* Build a list of currently loaded shared objects.  See solib-svr4.c  */
+/* 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;
+  struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
   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;
+  struct darwin_info *info = get_darwin_info ();
 
   /* Be sure image infos are loaded.  */
-  darwin_load_image_infos ();
+  darwin_load_image_infos (info);
 
-  if (!darwin_dyld_version_ok ())
+  if (!darwin_dyld_version_ok (info))
     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++)
+     The first entry was rumored to be the executable itself, but this is not
+     true when a large number of shared libraries are used (table expanded ?).
+     We now check all entries, but discard executable images.  */
+  for (i = 0; i < info->all_image.count; i++)
     {
-      CORE_ADDR info = dyld_all_image.info + i * image_info_size;
-      char buf[image_info_size];
+      CORE_ADDR iinfo = info->all_image.info + i * image_info_size;
+      gdb_byte buf[image_info_size];
       CORE_ADDR load_addr;
       CORE_ADDR path_addr;
+      struct mach_o_header_external hdr;
+      unsigned long hdr_val;
       char *file_path;
       int errcode;
       struct darwin_so_list *dnew;
@@ -239,12 +281,26 @@ darwin_current_sos (void)
       struct cleanup *old_chain;
 
       /* Read image info from inferior.  */
-      if (target_read_memory (info, buf, image_info_size))
+      if (target_read_memory (iinfo, buf, image_info_size))
 	break;
 
       load_addr = extract_typed_address (buf, ptr_type);
       path_addr = extract_typed_address (buf + ptr_len, ptr_type);
 
+      /* Read Mach-O header from memory.  */
+      if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4))
+	break;
+      /* Discard wrong magic numbers.  Shouldn't happen.  */
+      hdr_val = extract_unsigned_integer
+        (hdr.magic, sizeof (hdr.magic), byte_order);
+      if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64)
+        continue;
+      /* Discard executable.  Should happen only once.  */
+      hdr_val = extract_unsigned_integer
+        (hdr.filetype, sizeof (hdr.filetype), byte_order);
+      if (hdr_val == BFD_MACH_O_MH_EXECUTE)
+        continue;
+
       target_read_string (path_addr, &file_path,
 			  SO_NAME_MAX_PATH_SIZE - 1, &errcode);
       if (errcode)
@@ -275,10 +331,55 @@ darwin_current_sos (void)
   return head;
 }
 
+/* Get the load address of the executable.  We assume that the dyld info are
+   correct.  */
+
+static CORE_ADDR
+darwin_read_exec_load_addr (struct darwin_info *info)
+{
+  struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
+  int ptr_len = TYPE_LENGTH (ptr_type);
+  unsigned int image_info_size = ptr_len * 3;
+  int i;
+
+  /* Read infos for each solib.  One of them should be the executable.  */
+  for (i = 0; i < info->all_image.count; i++)
+    {
+      CORE_ADDR iinfo = info->all_image.info + i * image_info_size;
+      gdb_byte buf[image_info_size];
+      CORE_ADDR load_addr;
+      struct mach_o_header_external hdr;
+      unsigned long hdr_val;
+
+      /* Read image info from inferior.  */
+      if (target_read_memory (iinfo, buf, image_info_size))
+	break;
+
+      load_addr = extract_typed_address (buf, ptr_type);
+
+      /* Read Mach-O header from memory.  */
+      if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4))
+	break;
+      /* Discard wrong magic numbers.  Shouldn't happen.  */
+      hdr_val = extract_unsigned_integer
+        (hdr.magic, sizeof (hdr.magic), byte_order);
+      if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64)
+        continue;
+      /* Check executable.  */
+      hdr_val = extract_unsigned_integer
+        (hdr.filetype, sizeof (hdr.filetype), byte_order);
+      if (hdr_val == BFD_MACH_O_MH_EXECUTE)
+	return load_addr;
+    }
+
+  return 0;
+}
+
 /* Return 1 if PC lies in the dynamic symbol resolution code of the
    run time loader.  */
 
-int
+static int
 darwin_in_dynsym_resolve_code (CORE_ADDR pc)
 {
   return 0;
@@ -292,89 +393,171 @@ darwin_special_symbol_handling (void)
 {
 }
 
-/* Shared library startup support.  See documentation in solib-svr4.c  */
+/* A wrapper for bfd_mach_o_fat_extract that handles reference
+   counting properly.  This will either return NULL, or return a new
+   reference to a BFD.  */
+
+static bfd *
+gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format,
+			    const bfd_arch_info_type *arch)
+{
+  bfd *result = bfd_mach_o_fat_extract (abfd, format, arch);
+
+  if (result == NULL)
+    return NULL;
+
+  if (result == abfd)
+    gdb_bfd_ref (result);
+  else
+    gdb_bfd_mark_parent (result, abfd);
+
+  return result;
+}
+
+/* Extract dyld_all_image_addr when the process was just created, assuming the
+   current PC is at the entry of the dynamic linker.  */
 
 static void
-darwin_solib_create_inferior_hook (void)
+darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info)
 {
-  struct minimal_symbol *msymbol;
-  char **bkpt_namep;
-  asection *interp_sect;
-  gdb_byte *interp_name;
-  CORE_ADDR sym_addr;
+  char *interp_name;
   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 ();
+  struct cleanup *cleanup;
 
-  /* First, remove all the solib event breakpoints.  Their addresses
-     may have changed since the last time we ran the program.  */
-  remove_solib_event_breakpoints ();
+  /* This method doesn't work with an attached process.  */
+  if (current_inferior ()->attach_flag)
+    return;
 
   /* Find the program interpreter.  */
   interp_name = find_program_interpreter ();
   if (!interp_name)
     return;
 
+  cleanup = make_cleanup (null_cleanup, NULL);
+
   /* Create a bfd for the interpreter.  */
-  sym_addr = 0;
-  dyld_bfd = bfd_openr (interp_name, gnutarget);
+  dyld_bfd = gdb_bfd_open (interp_name, gnutarget, -1);
   if (dyld_bfd)
     {
       bfd *sub;
-      sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object,
-				    gdbarch_bfd_arch_info (target_gdbarch));
+
+      make_cleanup_bfd_unref (dyld_bfd);
+      sub = gdb_bfd_mach_o_fat_extract (dyld_bfd, bfd_object,
+					gdbarch_bfd_arch_info (target_gdbarch ()));
       if (sub)
-	dyld_bfd = sub;
-      else
 	{
-	  bfd_close (dyld_bfd);
-	  dyld_bfd = NULL;
+	  dyld_bfd = sub;
+	  make_cleanup_bfd_unref (sub);
 	}
+      else
+	dyld_bfd = NULL;
     }
   if (!dyld_bfd)
-    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 = (regcache_read_pc (get_current_regcache ())
-		   - bfd_get_start_address (dyld_bfd));
-    }
-  else
-    {
-      /* FIXME: todo.
-	 Get address of __DATA.__dyld in exec_bfd, read address at offset 0.
-      */
+      do_cleanups (cleanup);
       return;
     }
 
+  /* 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 = (regcache_read_pc (get_current_regcache ())
+               - bfd_get_start_address (dyld_bfd));
+
   /* Now try to set a breakpoint in the dynamic linker.  */
-  dyld_all_image_addr =
+  info->all_image_addr =
     lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos");
-  
-  bfd_close (dyld_bfd);
 
-  if (dyld_all_image_addr == 0)
+  do_cleanups (cleanup);
+
+  if (info->all_image_addr == 0)
+    return;
+
+  info->all_image_addr += load_addr;
+}
+
+/* Extract dyld_all_image_addr reading it from 
+   TARGET_OBJECT_DARWIN_DYLD_INFO.  */
+
+static void
+darwin_solib_read_all_image_info_addr (struct darwin_info *info)
+{
+  gdb_byte buf[8 + 8 + 4];
+  LONGEST len;
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
+
+  len = target_read (&current_target, TARGET_OBJECT_DARWIN_DYLD_INFO, NULL,
+                     buf, 0, sizeof (buf));
+  if (len != sizeof (buf))
     return;
 
-  dyld_all_image_addr += load_addr;
+  info->all_image_addr = extract_unsigned_integer (buf, 8, byte_order);
+}
+
+/* Shared library startup support.  See documentation in solib-svr4.c.  */
+
+static void
+darwin_solib_create_inferior_hook (int from_tty)
+{
+  struct darwin_info *info = get_darwin_info ();
+  CORE_ADDR load_addr;
+
+  info->all_image_addr = 0;
 
-  darwin_load_image_infos ();
+  darwin_solib_read_all_image_info_addr (info);
+
+  if (info->all_image_addr == 0)
+    darwin_solib_get_all_image_info_addr_at_init (info);
+
+  if (info->all_image_addr == 0)
+    return;
+
+  darwin_load_image_infos (info);
+
+  if (!darwin_dyld_version_ok (info))
+    return;
 
-  if (darwin_dyld_version_ok ())
-    create_solib_event_breakpoint (target_gdbarch, dyld_all_image.notifier);
+  create_solib_event_breakpoint (target_gdbarch (), info->all_image.notifier);
+
+  /* Possible relocate the main executable (PIE).  */
+  load_addr = darwin_read_exec_load_addr (info);
+  if (load_addr != 0 && symfile_objfile != NULL)
+    {
+      CORE_ADDR vmaddr = 0;
+      struct mach_o_data_struct *md = bfd_mach_o_get_data (exec_bfd);
+      unsigned int i, num;
+
+      /* Find the base address of the executable.  */
+      for (i = 0; i < md->header.ncmds; i++)
+	{
+	  struct bfd_mach_o_load_command *cmd = &md->commands[i];
+
+	  if (cmd->type != BFD_MACH_O_LC_SEGMENT
+	      && cmd->type != BFD_MACH_O_LC_SEGMENT_64)
+	    continue;
+	  if (cmd->command.segment.fileoff == 0
+	      && cmd->command.segment.vmaddr != 0
+	      && cmd->command.segment.filesize != 0)
+	    {
+	      vmaddr = cmd->command.segment.vmaddr;
+	      break;
+	    }
+	}
+
+      /* Relocate.  */
+      if (vmaddr != load_addr)
+	objfile_rebase (symfile_objfile, load_addr - vmaddr);
+    }
 }
 
 static void
 darwin_clear_solib (void)
 {
-  dyld_all_image_addr = 0;
-  dyld_all_image.version = 0;
+  struct darwin_info *info = get_darwin_info ();
+
+  info->all_image_addr = 0;
+  info->all_image.version = 0;
 }
 
 static void
@@ -408,7 +591,6 @@ darwin_relocate_section_addresses (struct so_list *so,
 static struct symbol *
 darwin_lookup_lib_symbol (const struct objfile *objfile,
 			  const char *name,
-			  const char *linkage_name,
 			  const domain_enum domain)
 {
   return NULL;
@@ -430,23 +612,31 @@ darwin_bfd_open (char *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 (target_gdbarch));
+  res = gdb_bfd_mach_o_fat_extract (abfd, bfd_object,
+				    gdbarch_bfd_arch_info (target_gdbarch ()));
   if (!res)
     {
-      bfd_close (abfd);
-      make_cleanup (xfree, found_pathname);
+      make_cleanup_bfd_unref (abfd);
       error (_("`%s': not a shared-library: %s"),
-	     found_pathname, bfd_errmsg (bfd_get_error ()));
+	     bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
     }
+
+  gdb_bfd_unref (abfd);
   return res;
 }
 
 struct target_so_ops darwin_so_ops;
 
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_darwin_solib;
+
 void
 _initialize_darwin_solib (void)
 {
+  solib_darwin_pspace_data
+    = register_program_space_data_with_cleanup (NULL,
+						darwin_pspace_data_cleanup);
+
   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;