451 lines
11 KiB
C
451 lines
11 KiB
C
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/* Handle Darwin shared libraries for GDB, the GNU Debugger.
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Copyright (C) 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "inferior.h"
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#include "gdbthread.h"
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#include "gdb_assert.h"
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#include "solist.h"
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#include "solib.h"
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#include "solib-svr4.h"
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#include "bfd-target.h"
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#include "elf-bfd.h"
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#include "exec.h"
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#include "auxv.h"
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#include "exceptions.h"
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#include "mach-o.h"
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struct gdb_dyld_image_info
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{
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/* Base address (which corresponds to the Mach-O header). */
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CORE_ADDR mach_header;
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/* Image file path. */
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CORE_ADDR file_path;
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/* st.m_time of image file. */
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unsigned long mtime;
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};
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/* Content of inferior dyld_all_image_infos structure. */
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struct gdb_dyld_all_image_infos
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{
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/* Version (1). */
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unsigned int version;
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/* Number of images. */
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unsigned int count;
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/* Image description. */
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CORE_ADDR info;
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/* Notifier (function called when a library is added or removed). */
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CORE_ADDR notifier;
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};
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/* Current all_image_infos version. */
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#define DYLD_VERSION 1
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/* Address of structure dyld_all_image_infos in inferior. */
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static CORE_ADDR dyld_all_image_addr;
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/* Gdb copy of dyld_all_info_infos. */
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static struct gdb_dyld_all_image_infos dyld_all_image;
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/* Read dyld_all_image from inferior. */
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static void
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darwin_load_image_infos (void)
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{
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gdb_byte buf[24];
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struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
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int len;
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/* If the structure address is not known, don't continue. */
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if (dyld_all_image_addr == 0)
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return;
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/* The structure has 4 fields: version (4 bytes), count (4 bytes),
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info (pointer) and notifier (pointer). */
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len = 4 + 4 + 2 * ptr_type->length;
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gdb_assert (len <= sizeof (buf));
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memset (&dyld_all_image, 0, sizeof (dyld_all_image));
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/* Read structure raw bytes from target. */
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if (target_read_memory (dyld_all_image_addr, buf, len))
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return;
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/* Extract the fields. */
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dyld_all_image.version = extract_unsigned_integer (buf, 4);
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if (dyld_all_image.version != DYLD_VERSION)
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return;
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dyld_all_image.count = extract_unsigned_integer (buf + 4, 4);
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dyld_all_image.info = extract_typed_address (buf + 8, ptr_type);
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dyld_all_image.notifier = extract_typed_address
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(buf + 8 + ptr_type->length, ptr_type);
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}
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/* Link map info to include in an allocated so_list entry. */
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struct lm_info
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{
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/* The target location of lm. */
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CORE_ADDR lm_addr;
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};
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struct darwin_so_list
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{
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/* Common field. */
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struct so_list sl;
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/* Darwin specific data. */
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struct lm_info li;
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};
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/* Lookup the value for a specific symbol. */
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static CORE_ADDR
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lookup_symbol_from_bfd (bfd *abfd, char *symname)
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{
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long storage_needed;
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asymbol **symbol_table;
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unsigned int number_of_symbols;
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unsigned int i;
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CORE_ADDR symaddr = 0;
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storage_needed = bfd_get_symtab_upper_bound (abfd);
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if (storage_needed <= 0)
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return 0;
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symbol_table = (asymbol **) xmalloc (storage_needed);
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number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
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for (i = 0; i < number_of_symbols; i++)
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{
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asymbol *sym = symbol_table[i];
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if (strcmp (sym->name, symname) == 0
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&& (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0)
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{
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/* BFD symbols are section relative. */
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symaddr = sym->value + sym->section->vma;
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break;
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}
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}
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xfree (symbol_table);
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return symaddr;
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}
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/* Return program interpreter string. */
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static gdb_byte *
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find_program_interpreter (void)
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{
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gdb_byte *buf = NULL;
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/* If we have an exec_bfd, use its section table. */
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if (exec_bfd)
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{
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struct bfd_section *dylinker_sect;
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dylinker_sect = bfd_get_section_by_name (exec_bfd, "LC_LOAD_DYLINKER");
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if (dylinker_sect != NULL)
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{
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int sect_size = bfd_section_size (exec_bfd, dylinker_sect);
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buf = xmalloc (sect_size);
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if (bfd_get_section_contents (exec_bfd, dylinker_sect,
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buf, 0, sect_size))
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return buf;
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xfree (buf);
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}
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}
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/* If we didn't find it, read from memory.
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FIXME: todo. */
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return buf;
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}
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/* Not used. I don't see how the main symbol file can be found: the
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interpreter name is needed and it is known from the executable file.
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Note that darwin-nat.c implements pid_to_exec_file. */
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static int
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open_symbol_file_object (void *from_ttyp)
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{
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return 0;
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}
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/* Build a list of currently loaded shared objects. See solib-svr4.c */
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static struct so_list *
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darwin_current_sos (void)
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{
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struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
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int ptr_len = TYPE_LENGTH (ptr_type);
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unsigned int image_info_size;
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CORE_ADDR lm;
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struct so_list *head = NULL;
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struct so_list *tail = NULL;
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int i;
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/* Be sure image infos are loaded. */
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darwin_load_image_infos ();
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if (dyld_all_image.version != DYLD_VERSION)
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return NULL;
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image_info_size = ptr_len * 3;
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/* Read infos for each solib.
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This first entry is ignored as this is the executable itself. */
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for (i = 1; i < dyld_all_image.count; i++)
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{
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CORE_ADDR info = dyld_all_image.info + i * image_info_size;
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char buf[image_info_size];
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CORE_ADDR load_addr;
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CORE_ADDR path_addr;
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char *file_path;
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int errcode;
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struct darwin_so_list *dnew;
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struct so_list *new;
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struct cleanup *old_chain;
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/* Read image info from inferior. */
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if (target_read_memory (info, buf, image_info_size))
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break;
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load_addr = extract_typed_address (buf, ptr_type);
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path_addr = extract_typed_address (buf + ptr_len, ptr_type);
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target_read_string (path_addr, &file_path,
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SO_NAME_MAX_PATH_SIZE - 1, &errcode);
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if (errcode)
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break;
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/* Create and fill the new so_list element. */
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dnew = XZALLOC (struct darwin_so_list);
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new = &dnew->sl;
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old_chain = make_cleanup (xfree, dnew);
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new->lm_info = &dnew->li;
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strncpy (new->so_name, file_path, SO_NAME_MAX_PATH_SIZE - 1);
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new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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strcpy (new->so_original_name, new->so_name);
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xfree (file_path);
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new->lm_info->lm_addr = load_addr;
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if (head == NULL)
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head = new;
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else
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tail->next = new;
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tail = new;
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discard_cleanups (old_chain);
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}
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return head;
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}
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/* Return 1 if PC lies in the dynamic symbol resolution code of the
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run time loader. */
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int
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darwin_in_dynsym_resolve_code (CORE_ADDR pc)
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{
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return 0;
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}
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/* No special symbol handling. */
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static void
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darwin_special_symbol_handling (void)
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{
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}
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/* Shared library startup support. See documentation in solib-svr4.c */
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static void
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darwin_solib_create_inferior_hook (void)
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{
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struct minimal_symbol *msymbol;
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char **bkpt_namep;
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asection *interp_sect;
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gdb_byte *interp_name;
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CORE_ADDR sym_addr;
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CORE_ADDR load_addr = 0;
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int load_addr_found = 0;
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int loader_found_in_list = 0;
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struct so_list *so;
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bfd *dyld_bfd = NULL;
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struct inferior *inf = current_inferior ();
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/* First, remove all the solib event breakpoints. Their addresses
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may have changed since the last time we ran the program. */
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remove_solib_event_breakpoints ();
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/* Find the program interpreter. */
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interp_name = find_program_interpreter ();
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if (!interp_name)
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return;
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/* Create a bfd for the interpreter. */
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sym_addr = 0;
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dyld_bfd = bfd_openr (interp_name, gnutarget);
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if (dyld_bfd)
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{
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bfd *sub;
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sub = bfd_mach_o_fat_extract (dyld_bfd, bfd_object,
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gdbarch_bfd_arch_info (current_gdbarch));
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if (sub)
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dyld_bfd = sub;
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else
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{
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bfd_close (dyld_bfd);
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dyld_bfd = NULL;
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}
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}
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if (!dyld_bfd)
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{
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xfree (interp_name);
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return;
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}
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if (!inf->attach_flag)
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{
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/* We find the dynamic linker's base address by examining
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the current pc (which should point at the entry point for the
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dynamic linker) and subtracting the offset of the entry point. */
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load_addr = (read_pc () - bfd_get_start_address (dyld_bfd));
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}
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else
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{
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/* FIXME: todo.
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Get address of __DATA.__dyld in exec_bfd, read address at offset 0
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*/
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xfree (interp_name);
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return;
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}
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/* Now try to set a breakpoint in the dynamic linker. */
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dyld_all_image_addr =
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lookup_symbol_from_bfd (dyld_bfd, "_dyld_all_image_infos");
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bfd_close (dyld_bfd);
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xfree (interp_name);
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if (dyld_all_image_addr == 0)
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return;
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dyld_all_image_addr += load_addr;
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darwin_load_image_infos ();
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if (dyld_all_image.version == DYLD_VERSION)
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create_solib_event_breakpoint (dyld_all_image.notifier);
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}
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static void
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darwin_clear_solib (void)
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{
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dyld_all_image_addr = 0;
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dyld_all_image.version = 0;
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}
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static void
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|||
|
|
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;
|
|||
|
|
}
|