/* Handle Darwin shared libraries for GDB, the GNU Debugger.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009-2014 Free Software Foundation, Inc.
This file is part of GDB.
#include "inferior.h"
#include "regcache.h"
#include "gdbthread.h"
+#include "gdb_bfd.h"
#include "gdb_assert.h"
#include "auxv.h"
#include "exceptions.h"
#include "mach-o.h"
+#include "mach-o/external.h"
struct gdb_dyld_image_info
{
unsigned long mtime;
};
-/* Content of inferior dyld_all_image_infos structure. */
+/* Content of inferior dyld_all_image_infos structure.
+ See /usr/include/mach-o/dyld_images.h for the documentation. */
struct gdb_dyld_all_image_infos
{
/* Version (1). */
};
/* Current all_image_infos version. */
-#define DYLD_VERSION 1
+#define DYLD_VERSION_MIN 1
+#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)
+{
+ xfree (arg);
+}
+
+/* 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;
+
+ info = program_space_data (current_program_space, solib_darwin_pspace_data);
+ if (info != NULL)
+ return info;
+
+ info = XCNEW (struct darwin_info);
+ set_program_space_data (current_program_space,
+ solib_darwin_pspace_data, info);
+ return info;
+}
-/* Gdb copy of dyld_all_info_infos. */
-static struct gdb_dyld_all_image_infos dyld_all_image;
+/* Return non-zero if the version in dyld_all_image is known. */
+
+static int
+darwin_dyld_version_ok (const struct darwin_info *info)
+{
+ 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];
- 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);
- if (dyld_all_image.version != DYLD_VERSION)
+ 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);
- 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);
}
};
/* Lookup the value for a specific symbol. */
+
static CORE_ADDR
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)
{
}
/* 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, use its section table. */
+ /* If we have an exec_bfd, get the interpreter from the load commands. */
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);
+ bfd_mach_o_load_command *cmd;
- buf = xmalloc (sect_size);
- if (bfd_get_section_contents (exec_bfd, dylinker_sect,
- buf, 0, sect_size))
- return buf;
- xfree (buf);
- }
+ if (bfd_mach_o_lookup_command (exec_bfd,
+ BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1)
+ return cmd->command.dylinker.name_str;
}
/* If we didn't find it, read from memory.
/* 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 */
+/* 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 (dyld_all_image.version != DYLD_VERSION)
+ 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;
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)
break;
/* Create and fill the new so_list element. */
- dnew = XZALLOC (struct darwin_so_list);
+ dnew = XCNEW (struct darwin_so_list);
new = &dnew->sl;
old_chain = make_cleanup (xfree, dnew);
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;
/* No special symbol handling. */
+
static void
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 (current_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)
{
- xfree (interp_name);
+ do_cleanups (cleanup);
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
- */
- xfree (interp_name);
- 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);
- xfree (interp_name);
- 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 (¤t_target, TARGET_OBJECT_DARWIN_DYLD_INFO, NULL,
+ buf, 0, sizeof (buf));
+ if (len != sizeof (buf))
+ return;
+
+ 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_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;
- dyld_all_image_addr += load_addr;
+ darwin_load_image_infos (info);
- darwin_load_image_infos ();
+ if (!darwin_dyld_version_ok (info))
+ return;
- if (dyld_all_image.version == DYLD_VERSION)
- create_solib_event_breakpoint (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
/* 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)
+ struct target_section *sec)
{
sec->addr += so->lm_info->lm_addr;
sec->endaddr += so->lm_info->lm_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;
/* 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));
+ 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 ()));
}
+
+ /* The current filename for fat-binary BFDs is a name generated
+ by BFD, usually a string containing the name of the architecture.
+ Reset its value to the actual filename. */
+ xfree (bfd_get_filename (res));
+ res->filename = xstrdup (pathname);
+
+ 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;
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