mirror of
https://github.com/openharmony/third_party_elfutils.git
synced 2026-07-18 17:24:31 -04:00
Mark Wielaard
775375e3bd
DWZ multifile forms http://www.dwarfstd.org/ShowIssue.php?issue=120604.1 DW_FORM_GNU_ref_alt and DW_FORM_GNU_strp_alt reference an alternative debuginfo file. dwarf_begin and dwarf_begin_elf will try to use this automatically. There are no user visible changes to the libdw interface. dwarf_formref_die, dwarf_formstring and dwarf_formudata can now return a Dwarf_Die which comes from a CU in the alternative Dwarf descriptor. __libdw_read_offset was adjusted to take an alternative Dwarf descriptor into account. Signed-off-by: Mark Wielaard <mjw@redhat.com>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* Create descriptor from file descriptor for processing file.
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Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <errno.h>
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#include <stddef.h>
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#include <sys/stat.h>
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#include <libdwP.h>
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Dwarf *
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dwarf_begin (fd, cmd)
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int fd;
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Dwarf_Cmd cmd;
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{
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Elf *elf;
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Elf_Cmd elfcmd;
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Dwarf *result = NULL;
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switch (cmd)
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{
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case DWARF_C_READ:
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elfcmd = ELF_C_READ_MMAP;
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break;
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case DWARF_C_WRITE:
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elfcmd = ELF_C_WRITE;
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break;
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case DWARF_C_RDWR:
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elfcmd = ELF_C_RDWR;
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break;
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default:
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/* No valid mode. */
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__libdw_seterrno (DWARF_E_INVALID_CMD);
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return NULL;
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}
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/* We have to call `elf_version' here since the user might have not
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done it or initialized libelf with a different version. This
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would break libdwarf since we are using the ELF data structures
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in a certain way. */
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elf_version (EV_CURRENT);
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/* Get an ELF descriptor. */
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elf = elf_begin (fd, elfcmd, NULL);
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if (elf == NULL)
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{
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/* Test why the `elf_begin" call failed. */
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struct stat64 st;
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if (fstat64 (fd, &st) == 0 && ! S_ISREG (st.st_mode))
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__libdw_seterrno (DWARF_E_NO_REGFILE);
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else if (errno == EBADF)
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__libdw_seterrno (DWARF_E_INVALID_FILE);
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else
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__libdw_seterrno (DWARF_E_IO_ERROR);
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}
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else
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{
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/* Do the real work now that we have an ELF descriptor. */
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result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL);
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/* If this failed, free the resources. */
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if (result == NULL)
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elf_end (elf);
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else
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result->free_elf = true;
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}
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return result;
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}
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INTDEF(dwarf_begin)
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