[RFA] Add support of shared lib for Darwin
Tristan Gingold
gingold@adacore.com
Thu Jan 8 14:09:00 GMT 2009
Hi,
this patch is a slightly rewritten version of a previous one.
It adds support for shared libraries for Darwin. It is based on a
patch from Ulrich (http://sourceware.org/ml/gdb-patches/2008-12/msg00317.html)
which made bfd file opening more flexible.
Tristan.
2009-01-08 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.
* configure.tgt: Add solib.o solib-darwin.o for Darwin.
diff -u -r1.206 configure.tgt
--- configure.tgt 27 Nov 2008 09:23:01 -0000 1.206
+++ configure.tgt 8 Jan 2009 13:55:06 -0000
@@ -148,7 +148,7 @@
i[34567]86-*-darwin*)
# Target: Darwin/i386
gdb_target_obs="amd64-tdep.o i386-tdep.o i387-tdep.o \
- i386-darwin-tdep.o"
+ i386-darwin-tdep.o solib.o solib-darwin.o"
;;
i[34567]86-*-dicos*)
# Target: DICOS/i386
diff -u -r1.2 i386-darwin-tdep.c
--- i386-darwin-tdep.c 3 Jan 2009 05:57:51 -0000 1.2
+++ i386-darwin-tdep.c 8 Jan 2009 13:55:07 -0000
@@ -39,6 +39,8 @@
#include "frame.h"
#include "gdb_assert.h"
#include "i386-darwin-tdep.h"
+#include "solib.h"
+#include "solib-darwin.h"
/* Offsets into the struct i386_thread_state where we'll find the saved regs.
From <mach/i386/thread_status.h> and i386-tdep.h. */
@@ -114,6 +116,8 @@
tdep->sc_num_regs = 16;
tdep->jb_pc_offset = 20;
+
+ set_solib_ops (gdbarch, &darwin_so_ops);
}
static void
@@ -131,6 +135,8 @@
tdep->sc_num_regs = ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
tdep->jb_pc_offset = 148;
+
+ set_solib_ops (gdbarch, &darwin_so_ops);
}
static enum gdb_osabi
diff -u -r1.2 machoread.c
--- machoread.c 3 Jan 2009 05:57:52 -0000 1.2
+++ machoread.c 8 Jan 2009 13:55:07 -0000
@@ -538,7 +538,7 @@
/* Get symbols from the symbol table only if the file is an executable.
The symbol table of object files is not relocated and is expected to
be in the executable. */
- if (bfd_get_file_flags (abfd) & EXEC_P)
+ if (bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC))
{
/* Process the normal symbol table first. */
storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
@@ -566,6 +566,12 @@
install_minimal_symbols (objfile);
+ /* Try to read .eh_frame / .debug_frame. */
+ /* First, locate these sections. We ignore the result status
+ as it only checks for debug info. */
+ dwarf2_has_info (objfile);
+ dwarf2_build_frame_info (objfile);
+
/* Check for DSYM file. */
dsym_bfd = macho_check_dsym (objfile);
if (dsym_bfd != NULL)
@@ -588,7 +594,7 @@
/* Now recurse: read dwarf from dsym. */
symbol_file_add_from_bfd (dsym_bfd, 0, NULL, 0, 0);
- /* Don't try to read dwarf2 from main file. */
+ /* Don't try to read dwarf2 from main file or shared libraries. */
return;
}
}
@@ -599,9 +605,8 @@
dwarf2_build_psymtabs (objfile, mainline);
}
- /* FIXME: kettenis/20030504: This still needs to be integrated with
- dwarf2read.c in a better way. */
- dwarf2_build_frame_info (objfile);
+ /* Do not try to read .eh_frame/.debug_frame as they are not relocated
+ and dwarf2_build_frame_info cannot deal with unrelocated sections. */
/* Then the oso. */
if (oso_vector != NULL)
@@ -661,10 +666,11 @@
{
const char *bfd_sect_name = osect->the_bfd_section->name;
int sect_index = osect->the_bfd_section->index;
-
- if (strcmp (bfd_sect_name, "LC_SEGMENT.__TEXT") == 0)
- objfile->sect_index_text = sect_index;
- else if (strcmp (bfd_sect_name, "LC_SEGMENT.__TEXT.__text") == 0)
+
+ if (strncmp (bfd_sect_name, "LC_SEGMENT.", 11) == 0)
+ bfd_sect_name += 11;
+ if (strcmp (bfd_sect_name, "__TEXT") == 0
+ || strcmp (bfd_sect_name, "__TEXT.__text") == 0)
objfile->sect_index_text = sect_index;
}
}
--- /dev/null 2009-01-08 14:53:34.000000000 +0100
+++ solib-darwin.h 2009-01-08 15:01:55.000000000 +0100
@@ -0,0 +1,28 @@
+/* Handle 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/>. */
+
+#ifndef SOLIB_DARWIN_H
+#define SOLIB_DARWIN_H
+
+struct objfile;
+struct target_so_ops;
+
+extern struct target_so_ops darwin_so_ops;
+
+#endif /* solib-darwin.h */
--- /dev/null 2009-01-08 14:53:34.000000000 +0100
+++ solib-darwin.c 2009-01-08 15:02:07.000000000 +0100
@@ -0,0 +1,463 @@
+/* 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 long version;
+ /* Number of images. */
+ unsigned long 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;
+
+ len = 4 + 4 + 2 * ptr_type->length;
+ memset (&dyld_all_image, 0, sizeof (dyld_all_image));
+
+ if (dyld_all_image_addr == 0)
+ return;
+
+ if (target_read_memory (dyld_all_image_addr, buf, len))
+ return;
+
+ 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
+{
+ struct so_list sl;
+ struct lm_info li;
+};
+
+/* Local function prototypes */
+
+static int match_main (char *);
+
+static CORE_ADDR bfd_lookup_symbol (bfd *, char *);
+
+/* Return non-zero if GDB_SO_NAME and INFERIOR_SO_NAME represent
+ the same shared library. */
+
+static int
+darwin_same (struct so_list *gdb, struct so_list *inferior)
+{
+ return strcmp (gdb->so_original_name, inferior->so_original_name) == 0;
+}
+
+/* Lookup the value for a specific symbol. */
+static CORE_ADDR
+bfd_lookup_symbol (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)
+ {
+ 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. */
+ for (i = 0; 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;
+
+ /* Ignore first entry as this is the executable itself. */
+ if (i == 0)
+ continue;
+
+ /* 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 =
+ bfd_lookup_symbol (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;
+}
+
+extern initialize_file_ftype _initialize_svr4_solib; /* -Wmissing-prototypes */
+
+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.same = darwin_same;
+ darwin_so_ops.bfd_open = darwin_bfd_open;
+}
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