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121 lines
3.3 KiB
121 lines
3.3 KiB
/* Return build ID information for a module. |
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Copyright (C) 2007-2010, 2014 Red Hat, Inc. |
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This file is part of elfutils. |
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This file is free software; you can redistribute it and/or modify |
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it under the terms of either |
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* the GNU Lesser General Public License as published by the Free |
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Software Foundation; either version 3 of the License, or (at |
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your option) any later version |
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or |
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* the GNU General Public License as published by the Free |
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Software Foundation; either version 2 of the License, or (at |
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your option) any later version |
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or both in parallel, as here. |
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elfutils is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received copies of the GNU General Public License and |
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the GNU Lesser General Public License along with this program. If |
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not, see <http://www.gnu.org/licenses/>. */ |
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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#include "libdwflP.h" |
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static int |
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found_build_id (Dwfl_Module *mod, bool set, |
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const void *bits, int len, GElf_Addr vaddr) |
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{ |
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if (!set) |
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/* When checking bits, we do not compare VADDR because the |
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address found in a debuginfo file may not match the main |
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file as modified by prelink. */ |
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return 1 + (mod->build_id_len == len |
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&& !memcmp (bits, mod->build_id_bits, len)); |
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void *copy = malloc (len); |
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if (unlikely (copy == NULL)) |
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{ |
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__libdwfl_seterrno (DWFL_E_NOMEM); |
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return -1; |
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} |
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mod->build_id_bits = memcpy (copy, bits, len); |
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mod->build_id_vaddr = vaddr; |
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mod->build_id_len = len; |
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return len; |
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} |
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int |
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internal_function |
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__libdwfl_find_build_id (Dwfl_Module *mod, bool set, Elf *elf) |
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{ |
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const void *build_id_bits; |
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GElf_Addr build_id_elfaddr; |
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int build_id_len; |
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/* For mod == NULL use dwelf_elf_gnu_build_id directly. */ |
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assert (mod != NULL); |
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int result = __libdwfl_find_elf_build_id (mod, elf, &build_id_bits, |
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&build_id_elfaddr, &build_id_len); |
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if (result <= 0) |
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return result; |
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GElf_Addr build_id_vaddr = build_id_elfaddr + (build_id_elfaddr != 0 |
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? mod->main_bias : 0); |
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return found_build_id (mod, set, build_id_bits, build_id_len, build_id_vaddr); |
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} |
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int |
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dwfl_module_build_id (Dwfl_Module *mod, |
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const unsigned char **bits, GElf_Addr *vaddr) |
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{ |
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if (mod == NULL) |
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return -1; |
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if (mod->build_id_len == 0 && mod->main.elf != NULL) |
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{ |
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/* We have the file, but have not examined it yet. */ |
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int result = __libdwfl_find_build_id (mod, true, mod->main.elf); |
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if (result <= 0) |
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{ |
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mod->build_id_len = -1; /* Cache negative result. */ |
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return result; |
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} |
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} |
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if (mod->build_id_len <= 0) |
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return 0; |
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*bits = mod->build_id_bits; |
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*vaddr = mod->build_id_vaddr; |
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return mod->build_id_len; |
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} |
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INTDEF (dwfl_module_build_id) |
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NEW_VERSION (dwfl_module_build_id, ELFUTILS_0.138) |
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#ifdef SYMBOL_VERSIONING |
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COMPAT_VERSION (dwfl_module_build_id, ELFUTILS_0.130, vaddr_at_end) |
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int |
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_compat_vaddr_at_end_dwfl_module_build_id (Dwfl_Module *mod, |
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const unsigned char **bits, |
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GElf_Addr *vaddr) |
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{ |
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int result = INTUSE(dwfl_module_build_id) (mod, bits, vaddr); |
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if (result > 0) |
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*vaddr += (result + 3) & -4; |
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return result; |
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} |
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#endif
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