cf1061c036
* 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.
700 lines
19 KiB
C
700 lines
19 KiB
C
/* Darwin support for GDB, the GNU debugger.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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Contributed by AdaCore.
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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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*/
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.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 "buildsym.h"
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#include "gdbcmd.h"
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#include "gdbcore.h"
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#include "mach-o.h"
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#include "gdb_assert.h"
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#include "aout/stab_gnu.h"
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#include "vec.h"
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#include <string.h>
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/* If non-zero displays debugging message. */
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static int mach_o_debug_level = 0;
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static void
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macho_new_init (struct objfile *objfile)
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{
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}
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static void
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macho_symfile_init (struct objfile *objfile)
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{
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objfile->flags |= OBJF_REORDERED;
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init_entry_point_info (objfile);
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}
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/* Dwarf debugging information are never in the final executable. They stay
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in object files and the executable contains the list of object files read
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during the link.
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Each time an oso (other source) is found in the executable, the reader
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creates such a structure. They are read after the processing of the
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executable.
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*/
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typedef struct oso_el
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{
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/* Object file name. */
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const char *name;
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/* Associated time stamp. */
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unsigned long mtime;
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/* Number of sections. This is the length of SYMBOLS and OFFSETS array. */
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int num_sections;
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/* Each seaction of the object file is represented by a symbol and its
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offset. */
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asymbol **symbols;
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bfd_vma *offsets;
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}
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oso_el;
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/* Vector of object files to be read after the executable. */
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DEF_VEC_O (oso_el);
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static VEC (oso_el) *oso_vector;
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/* Add a new OSO to the vector. */
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static void
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macho_add_oso (const asymbol *oso_sym, int nbr_sections,
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asymbol **symbols, bfd_vma *offsets)
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{
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oso_el el;
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el.name = oso_sym->name;
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el.mtime = oso_sym->value;
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el.num_sections = nbr_sections;
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el.symbols = symbols;
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el.offsets = offsets;
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VEC_safe_push (oso_el, oso_vector, &el);
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}
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/* Build the minimal symbol table from SYMBOL_TABLE of length
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NUMBER_OF_SYMBOLS for OBJFILE.
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Read OSO files at the end. */
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static void
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macho_symtab_read (struct objfile *objfile,
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long number_of_symbols, asymbol **symbol_table)
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{
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struct gdbarch *gdbarch = get_objfile_arch (objfile);
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long storage_needed;
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asymbol *sym;
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long i, j;
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CORE_ADDR offset;
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enum minimal_symbol_type ms_type;
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unsigned int nbr_sections = bfd_count_sections (objfile->obfd);
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asymbol **first_symbol = NULL;
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bfd_vma *first_offset = NULL;
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const asymbol *oso_file = NULL;
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for (i = 0; i < number_of_symbols; i++)
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{
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sym = symbol_table[i];
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offset = ANOFFSET (objfile->section_offsets, sym->section->index);
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if (sym->flags & BSF_DEBUGGING)
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{
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unsigned char type = BFD_MACH_O_SYM_NTYPE(sym);
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bfd_vma addr;
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switch (type)
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{
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case N_SO:
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if ((sym->name == NULL || sym->name[0] == 0)
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&& oso_file != NULL)
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{
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macho_add_oso (oso_file, nbr_sections,
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first_symbol, first_offset);
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first_symbol = NULL;
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first_offset = NULL;
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oso_file = NULL;
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}
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break;
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case N_FUN:
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case N_STSYM:
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if (sym->name == NULL || sym->name[0] == '\0')
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break;
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/* Fall through. */
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case N_BNSYM:
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gdb_assert (oso_file != NULL);
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addr = sym->value
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+ bfd_get_section_vma (sym->section->bfd, sym->section);
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if (addr != 0
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&& first_symbol[sym->section->index] == NULL)
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{
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first_symbol[sym->section->index] = sym;
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first_offset[sym->section->index] = addr + offset;
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}
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break;
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case N_GSYM:
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gdb_assert (oso_file != NULL);
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if (first_symbol[sym->section->index] == NULL)
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first_symbol[sym->section->index] = sym;
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break;
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case N_OSO:
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gdb_assert (oso_file == NULL);
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first_symbol = (asymbol **)xmalloc (nbr_sections
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* sizeof (asymbol *));
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first_offset = (bfd_vma *)xmalloc (nbr_sections
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* sizeof (bfd_vma));
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for (j = 0; j < nbr_sections; j++)
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first_symbol[j] = NULL;
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oso_file = sym;
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break;
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}
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continue;
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}
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if (sym->name == NULL || *sym->name == '\0')
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{
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/* Skip names that don't exist (shouldn't happen), or names
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that are null strings (may happen). */
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continue;
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}
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if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
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{
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struct minimal_symbol *msym;
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CORE_ADDR symaddr;
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/* Bfd symbols are section relative. */
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symaddr = sym->value + sym->section->vma;
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/* Select global/local/weak symbols. Note that bfd puts abs
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symbols in their own section, so all symbols we are
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interested in will have a section. */
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/* Relocate all non-absolute and non-TLS symbols by the
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section offset. */
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if (sym->section != &bfd_abs_section
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&& !(sym->section->flags & SEC_THREAD_LOCAL))
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symaddr += offset;
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if (sym->section == &bfd_abs_section)
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ms_type = mst_abs;
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else if (sym->section->flags & SEC_CODE)
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{
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if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
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ms_type = mst_text;
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else
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ms_type = mst_file_text;
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}
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else if (sym->section->flags & SEC_ALLOC)
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{
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if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
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{
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if (sym->section->flags & SEC_LOAD)
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ms_type = mst_data;
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else
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ms_type = mst_bss;
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}
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else if (sym->flags & BSF_LOCAL)
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{
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/* Not a special stabs-in-elf symbol, do regular
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symbol processing. */
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if (sym->section->flags & SEC_LOAD)
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ms_type = mst_file_data;
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else
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ms_type = mst_file_bss;
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}
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else
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ms_type = mst_unknown;
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}
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else
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continue; /* Skip this symbol. */
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gdb_assert (sym->section->index < nbr_sections);
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if (oso_file != NULL
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&& first_symbol[sym->section->index] == NULL)
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{
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first_symbol[sym->section->index] = sym;
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first_offset[sym->section->index] = symaddr;
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}
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msym = prim_record_minimal_symbol_and_info
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(sym->name, symaddr, ms_type, sym->section->index,
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sym->section, objfile);
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}
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}
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if (oso_file != NULL)
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macho_add_oso (oso_file, nbr_sections, first_symbol, first_offset);
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}
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/* If NAME describes an archive member (ie: ARCHIVE '(' MEMBER ')'),
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returns the length of the archive name.
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Returns -1 otherwise. */
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static int
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get_archive_prefix_len (const char *name)
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{
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char *lparen;
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int name_len = strlen (name);
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if (name_len == 0 || name[name_len - 1] != ')')
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return -1;
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lparen = strrchr (name, '(');
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if (lparen == NULL || lparen == name)
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return -1;
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return lparen - name;
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}
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/* Read symbols from the vector of oso files. */
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static void
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macho_oso_symfile (struct objfile *main_objfile)
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{
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int ix;
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VEC (oso_el) *vec;
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oso_el *oso;
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char leading_char;
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/* TODO: Sort them, group library search. */
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vec = oso_vector;
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oso_vector = NULL;
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leading_char = bfd_get_symbol_leading_char (main_objfile->obfd);
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for (ix = 0; VEC_iterate (oso_el, vec, ix, oso); ix++)
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{
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struct section_addr_info *addrs;
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int pfx_len;
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int len;
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int i;
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oso_el el;
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if (mach_o_debug_level > 0)
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printf_unfiltered (_("Loading symbols from oso: %s\n"), oso->name);
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/* Compute addr length. */
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len = 0;
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for (i = 0; i < oso->num_sections; i++)
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if (oso->symbols[i] != NULL)
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len++;
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addrs = alloc_section_addr_info (len);
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len = 0;
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for (i = 0; i < oso->num_sections; i++)
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if (oso->symbols[i] != NULL)
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{
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if (oso->offsets[i])
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addrs->other[len].addr = oso->offsets[i];
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else
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{
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struct minimal_symbol *msym;
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const char *name = oso->symbols[i]->name;
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if (name[0] == leading_char)
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++name;
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if (mach_o_debug_level > 3)
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printf_unfiltered (_("resolv sec %s with %s\n"),
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oso->symbols[i]->section->name,
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oso->symbols[i]->name);
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msym = lookup_minimal_symbol (name, NULL, main_objfile);
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if (msym == NULL)
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{
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warning (_("can't find symbol '%s' in minsymtab"),
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oso->symbols[i]->name);
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addrs->other[len].addr = 0;
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}
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else
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addrs->other[len].addr = SYMBOL_VALUE_ADDRESS (msym);
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}
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addrs->other[len].name = (char *)oso->symbols[i]->section->name;
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len++;
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}
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if (mach_o_debug_level > 1)
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{
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int j;
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for (j = 0; j < addrs->num_sections; j++)
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printf_unfiltered
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(_(" %s: %s\n"),
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core_addr_to_string (addrs->other[j].addr),
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addrs->other[j].name);
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}
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/* Check if this is a library name. */
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pfx_len = get_archive_prefix_len (oso->name);
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if (pfx_len > 0)
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{
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bfd *archive_bfd;
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bfd *member_bfd;
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char *archive_name = (char *) alloca (pfx_len + 1);
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int member_len;
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member_len = strlen (oso->name + pfx_len + 1) - 1;
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memcpy (archive_name, oso->name, pfx_len);
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archive_name[pfx_len] = '\0';
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/* Open the archive and check the format. */
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archive_bfd = bfd_openr (archive_name, gnutarget);
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if (archive_bfd == NULL)
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{
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warning (_("Could not open OSO archive file \"%s\""),
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archive_name);
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continue;
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}
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if (!bfd_check_format (archive_bfd, bfd_archive))
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{
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warning (_("OSO archive file \"%s\" not an archive."),
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archive_name);
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bfd_close (archive_bfd);
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continue;
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}
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member_bfd = bfd_openr_next_archived_file (archive_bfd, NULL);
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if (member_bfd == NULL)
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{
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warning (_("Could not read archive members out of "
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"OSO archive \"%s\""), archive_name);
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bfd_close (archive_bfd);
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continue;
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}
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while (member_bfd != NULL)
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{
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bfd *prev = member_bfd;
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const char *member_name = member_bfd->filename;
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if (strlen (member_name) == member_len
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&& !memcmp (member_name, oso->name + pfx_len + 1, member_len))
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break;
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member_bfd = bfd_openr_next_archived_file
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(archive_bfd, member_bfd);
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bfd_close (prev);
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}
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if (member_bfd == NULL)
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{
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warning (_("Could not find specified archive member "
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"for OSO name \"%s\""), oso->name);
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bfd_close (archive_bfd);
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continue;
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}
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bfd_set_cacheable (member_bfd, 1);
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if (!bfd_check_format (member_bfd, bfd_object))
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{
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warning (_("`%s': can't read symbols: %s."), oso->name,
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bfd_errmsg (bfd_get_error ()));
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bfd_close (member_bfd);
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}
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else
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symbol_file_add_from_bfd (member_bfd, 0, addrs, 0, 0);
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}
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else
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{
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bfd *abfd;
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abfd = bfd_openr (oso->name, gnutarget);
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if (!abfd)
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{
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warning (_("`%s': can't open to read symbols: %s."), oso->name,
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bfd_errmsg (bfd_get_error ()));
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continue;
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}
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bfd_set_cacheable (abfd, 1);
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if (!bfd_check_format (abfd, bfd_object))
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{
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bfd_close (abfd);
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warning (_("`%s': can't read symbols: %s."), oso->name,
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bfd_errmsg (bfd_get_error ()));
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continue;
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}
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symbol_file_add_from_bfd (abfd, 0, addrs, 0, 0);
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}
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xfree (oso->symbols);
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xfree (oso->offsets);
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}
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VEC_free (oso_el, vec);
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}
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/* DSYM (debug symbols) files contain the debug info of an executable.
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This is a separate file created by dsymutil(1) and is similar to debug
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link feature on ELF.
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DSYM files are located in a subdirectory. Append DSYM_SUFFIX to the
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executable name and the executable base name to get the DSYM file name. */
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#define DSYM_SUFFIX ".dSYM/Contents/Resources/DWARF/"
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/* Check if a dsym file exists for OBJFILE. If so, returns a bfd for it.
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Return NULL if no valid dsym file is found. */
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static bfd *
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macho_check_dsym (struct objfile *objfile)
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{
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size_t name_len = strlen (objfile->name);
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size_t dsym_len = strlen (DSYM_SUFFIX);
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const char *base_name = lbasename (objfile->name);
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size_t base_len = strlen (base_name);
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char *dsym_filename = alloca (name_len + dsym_len + base_len + 1);
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bfd *dsym_bfd;
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asection *sect;
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bfd_byte main_uuid[16];
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bfd_byte dsym_uuid[16];
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strcpy (dsym_filename, objfile->name);
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strcpy (dsym_filename + name_len, DSYM_SUFFIX);
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strcpy (dsym_filename + name_len + dsym_len, base_name);
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if (access (dsym_filename, R_OK) != 0)
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return NULL;
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sect = bfd_get_section_by_name (objfile->obfd, "LC_UUID");
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if (sect == NULL)
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{
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warning (_("can't find UUID in %s"), objfile->name);
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return NULL;
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}
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if (!bfd_get_section_contents (objfile->obfd, sect, main_uuid,
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0, sizeof (main_uuid)))
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{
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warning (_("can't read UUID in %s"), objfile->name);
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return NULL;
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}
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dsym_filename = xstrdup (dsym_filename);
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dsym_bfd = bfd_openr (dsym_filename, gnutarget);
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if (dsym_bfd == NULL)
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{
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warning (_("can't open dsym file %s"), dsym_filename);
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xfree (dsym_filename);
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return NULL;
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}
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if (!bfd_check_format (dsym_bfd, bfd_object))
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{
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bfd_close (dsym_bfd);
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warning (_("bad dsym file format: %s"), bfd_errmsg (bfd_get_error ()));
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xfree (dsym_filename);
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return NULL;
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}
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sect = bfd_get_section_by_name (dsym_bfd, "LC_UUID");
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if (sect == NULL)
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{
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warning (_("can't find UUID in %s"), dsym_filename);
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bfd_close (dsym_bfd);
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xfree (dsym_filename);
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return NULL;
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}
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if (!bfd_get_section_contents (dsym_bfd, sect, dsym_uuid,
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0, sizeof (dsym_uuid)))
|
|
{
|
|
warning (_("can't read UUID in %s"), dsym_filename);
|
|
bfd_close (dsym_bfd);
|
|
xfree (dsym_filename);
|
|
return NULL;
|
|
}
|
|
if (memcmp (dsym_uuid, main_uuid, sizeof (main_uuid)))
|
|
{
|
|
warning (_("dsym file UUID doesn't match the one in %s"), objfile->name);
|
|
bfd_close (dsym_bfd);
|
|
xfree (dsym_filename);
|
|
return NULL;
|
|
}
|
|
return dsym_bfd;
|
|
|
|
}
|
|
|
|
static void
|
|
macho_symfile_read (struct objfile *objfile, int mainline)
|
|
{
|
|
bfd *abfd = objfile->obfd;
|
|
struct cleanup *back_to;
|
|
CORE_ADDR offset;
|
|
long storage_needed;
|
|
bfd *dsym_bfd;
|
|
|
|
init_minimal_symbol_collection ();
|
|
back_to = make_cleanup_discard_minimal_symbols ();
|
|
|
|
/* 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 | DYNAMIC))
|
|
{
|
|
/* Process the normal symbol table first. */
|
|
storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
|
|
if (storage_needed < 0)
|
|
error (_("Can't read symbols from %s: %s"),
|
|
bfd_get_filename (objfile->obfd),
|
|
bfd_errmsg (bfd_get_error ()));
|
|
|
|
if (storage_needed > 0)
|
|
{
|
|
asymbol **symbol_table;
|
|
long symcount;
|
|
|
|
symbol_table = (asymbol **) xmalloc (storage_needed);
|
|
make_cleanup (xfree, symbol_table);
|
|
symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
|
|
|
|
if (symcount < 0)
|
|
error (_("Can't read symbols from %s: %s"),
|
|
bfd_get_filename (objfile->obfd),
|
|
bfd_errmsg (bfd_get_error ()));
|
|
|
|
macho_symtab_read (objfile, symcount, symbol_table);
|
|
}
|
|
|
|
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)
|
|
{
|
|
int ix;
|
|
oso_el *oso;
|
|
|
|
if (mach_o_debug_level > 0)
|
|
printf_unfiltered (_("dsym file found\n"));
|
|
|
|
/* Remove oso. They won't be used. */
|
|
for (ix = 0; VEC_iterate (oso_el, oso_vector, ix, oso); ix++)
|
|
{
|
|
xfree (oso->symbols);
|
|
xfree (oso->offsets);
|
|
}
|
|
VEC_free (oso_el, oso_vector);
|
|
oso_vector = NULL;
|
|
|
|
/* 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 or shared libraries. */
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (dwarf2_has_info (objfile))
|
|
{
|
|
/* DWARF 2 sections */
|
|
dwarf2_build_psymtabs (objfile, mainline);
|
|
}
|
|
|
|
/* 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)
|
|
macho_oso_symfile (objfile);
|
|
}
|
|
|
|
static void
|
|
macho_symfile_finish (struct objfile *objfile)
|
|
{
|
|
}
|
|
|
|
static void
|
|
macho_symfile_offsets (struct objfile *objfile,
|
|
struct section_addr_info *addrs)
|
|
{
|
|
unsigned int i;
|
|
unsigned int num_sections;
|
|
struct obj_section *osect;
|
|
|
|
/* Allocate section_offsets. */
|
|
objfile->num_sections = bfd_count_sections (objfile->obfd);
|
|
objfile->section_offsets = (struct section_offsets *)
|
|
obstack_alloc (&objfile->objfile_obstack,
|
|
SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
|
|
memset (objfile->section_offsets, 0,
|
|
SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
|
|
|
|
/* This code is run when we first add the objfile with
|
|
symfile_add_with_addrs_or_offsets, when "addrs" not "offsets" are
|
|
passed in. The place in symfile.c where the addrs are applied
|
|
depends on the addrs having section names. But in the dyld code
|
|
we build an anonymous array of addrs, so that code is a no-op.
|
|
Because of that, we have to apply the addrs to the sections here.
|
|
N.B. if an objfile slides after we've already created it, then it
|
|
goes through objfile_relocate. */
|
|
|
|
for (i = 0; i < addrs->num_sections; i++)
|
|
{
|
|
if (addrs->other[i].name == NULL)
|
|
continue;
|
|
|
|
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
|
{
|
|
const char *bfd_sect_name = osect->the_bfd_section->name;
|
|
|
|
if (strcmp (bfd_sect_name, addrs->other[i].name) == 0)
|
|
{
|
|
obj_section_offset (osect) = addrs->other[i].addr;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
objfile->sect_index_text = 0;
|
|
|
|
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
|
{
|
|
const char *bfd_sect_name = osect->the_bfd_section->name;
|
|
int sect_index = osect->the_bfd_section->index;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static struct sym_fns macho_sym_fns = {
|
|
bfd_target_mach_o_flavour,
|
|
|
|
macho_new_init, /* sym_new_init: init anything gbl to entire symtab */
|
|
macho_symfile_init, /* sym_init: read initial info, setup for sym_read() */
|
|
macho_symfile_read, /* sym_read: read a symbol file into symtab */
|
|
macho_symfile_finish, /* sym_finish: finished with file, cleanup */
|
|
macho_symfile_offsets, /* sym_offsets: xlate external to internal form */
|
|
NULL /* next: pointer to next struct sym_fns */
|
|
};
|
|
|
|
void
|
|
_initialize_machoread ()
|
|
{
|
|
add_symtab_fns (&macho_sym_fns);
|
|
|
|
add_setshow_zinteger_cmd ("mach-o", class_obscure,
|
|
&mach_o_debug_level, _("\
|
|
Set if printing Mach-O symbols processing."), _("\
|
|
Show if printing Mach-O symbols processing."), NULL,
|
|
NULL, NULL,
|
|
&setdebuglist, &showdebuglist);
|
|
}
|