mirror of
https://github.com/openharmony/third_party_elfutils.git
synced 2026-07-19 11:33:45 -04:00
Mark Wielaard
de2ed97f33
* Change name from "Red Hat elfutils" to "elfutils". * Update license of standalone tools and test from GPLv2 to GPLv3+. * Change license of libraries from GPLv2+exception to GPLv2/LGPLv3+. * Add Developer Certificate of Origin based contributor policy. top-level: - COPYING: Upgraded from GPLv2 to GPLv3. - CONTRIBUTING, COPYING-GPLv2, COPYING-LGPLv3: New files. - NEWS: Added note about new contribution and license policy. - Makefile.am: Updated to GPLv3, added new files to EXTRA_DIST. - configure.ac: Update to GPLv3, changed AC_INIT name to 'elfutils'. backends, lib, libasm, libcpu, libdw, libdwfl, libebl, libelf: - All files updated to GPLv2/LGPLv3+. Except some very small files (<5 lines) which didn't have any headers at all before, the linker .maps files and the libcpu/defs files which only contain data and libelf/elf.h which comes from glibc and is under LGPLv2+. config: - elfutils.spec.in: Add new License: headers and new %doc files. - Update all license headers to GPLv2/LGPLv3+ for files used by libs. src, tests: - All files updated to GPLv3+. Except for the test bz2 data files, the linker maps and script files and some very small files (<5 lines) that don't have any headers. Signed-off-by: Richard Fontana <rfontana@redhat.com> Signed-off-by: Mark Wielaard <mjw@redhat.com>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/* Linux kernel image support for libdwfl.
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Copyright (C) 2009-2011 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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#include "libdwflP.h"
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#include "system.h"
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#include <unistd.h>
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#include <endian.h>
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#if BYTE_ORDER == LITTLE_ENDIAN
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# define LE16(x) (x)
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#else
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# define LE16(x) bswap_16 (x)
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#endif
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/* See Documentation/x86/boot.txt in Linux kernel sources
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for an explanation of these format details. */
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#define MAGIC1 0xaa55
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#define MAGIC2 0x53726448 /* "HdrS" little-endian */
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#define MIN_VERSION 0x0208
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#define H_START (H_SETUP_SECTS & -4)
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#define H_SETUP_SECTS 0x1f1
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#define H_MAGIC1 0x1fe
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#define H_MAGIC2 0x202
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#define H_VERSION 0x206
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#define H_PAYLOAD_OFFSET 0x248
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#define H_PAYLOAD_LENGTH 0x24c
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#define H_END 0x250
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#define H_READ_SIZE (H_END - H_START)
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Dwfl_Error
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internal_function
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__libdw_image_header (int fd, off64_t *start_offset,
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void *mapped, size_t mapped_size)
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{
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if (likely (mapped_size > H_END))
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{
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const void *header = mapped;
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char header_buffer[H_READ_SIZE];
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if (header == NULL)
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{
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ssize_t n = pread_retry (fd, header_buffer, H_READ_SIZE,
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*start_offset + H_START);
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if (n < 0)
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return DWFL_E_ERRNO;
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if (n < H_READ_SIZE)
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return DWFL_E_BADELF;
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header = header_buffer - H_START;
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}
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if (*(uint16_t *) (header + H_MAGIC1) == LE16 (MAGIC1)
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&& *(uint32_t *) (header + H_MAGIC2) == LE32 (MAGIC2)
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&& LE16 (*(uint16_t *) (header + H_VERSION)) >= MIN_VERSION)
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{
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/* The magic numbers match and the version field is sufficient.
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Extract the payload bounds. */
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uint32_t offset = LE32 (*(uint32_t *) (header + H_PAYLOAD_OFFSET));
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uint32_t length = LE32 (*(uint32_t *) (header + H_PAYLOAD_LENGTH));
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offset += ((*(uint8_t *) (header + H_SETUP_SECTS) ?: 4) + 1) * 512;
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if (offset > H_END && offset < mapped_size
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&& mapped_size - offset >= length)
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{
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/* It looks kosher. Use it! */
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*start_offset += offset;
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return DWFL_E_NOERROR;
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}
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}
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}
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return DWFL_E_BADELF;
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}
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