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/*
* Linker script macros to generate Image header fields.
*
* Copyright (C) 2014 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 __ASM_IMAGE_H
#define __ASM_IMAGE_H
#ifndef LINKER_SCRIPT
#error This file should only be included in vmlinux.lds.S
#endif
/*
* There aren't any ELF relocations we can use to endian-swap values known only
* at link time (e.g. the subtraction of two symbol addresses), so we must get
* the linker to endian-swap certain values before emitting them.
*/
#ifdef CONFIG_CPU_BIG_ENDIAN
#define DATA_LE64(data) \
((((data) & 0x00000000000000ff) << 56) | \
(((data) & 0x000000000000ff00) << 40) | \
(((data) & 0x0000000000ff0000) << 24) | \
(((data) & 0x00000000ff000000) << 8) | \
(((data) & 0x000000ff00000000) >> 8) | \
(((data) & 0x0000ff0000000000) >> 24) | \
(((data) & 0x00ff000000000000) >> 40) | \
(((data) & 0xff00000000000000) >> 56))
#else
#define DATA_LE64(data) ((data) & 0xffffffffffffffff)
#endif
#ifdef CONFIG_CPU_BIG_ENDIAN
#define __HEAD_FLAG_BE 1
#else
#define __HEAD_FLAG_BE 0
#endif
#define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)
#define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \
(__HEAD_FLAG_PAGE_SIZE << 1))
/*
* These will output as part of the Image header, which should be little-endian
* regardless of the endianness of the kernel. While constant values could be
* endian swapped in head.S, all are done here for consistency.
*/
#define HEAD_SYMBOLS \
_kernel_size_le = DATA_LE64(_end - _text); \
_kernel_offset_le = DATA_LE64(TEXT_OFFSET); \
_kernel_flags_le = DATA_LE64(__HEAD_FLAGS);
#ifdef CONFIG_EFI
/*
* The EFI stub has its own symbol namespace prefixed by __efistub_, to
* isolate it from the kernel proper. The following symbols are legally
* accessed by the stub, so provide some aliases to make them accessible.
* Only include data symbols here, or text symbols of functions that are
* guaranteed to be safe when executed at another offset than they were
* linked at. The routines below are all implemented in assembler in a
* position independent manner
*/
__efistub_memcmp = __pi_memcmp;
__efistub_memchr = __pi_memchr;
__efistub_memcpy = __pi_memcpy;
__efistub_memmove = __pi_memmove;
__efistub_memset = __pi_memset;
__efistub_strlen = __pi_strlen;
__efistub_strcmp = __pi_strcmp;
__efistub_strncmp = __pi_strncmp;
__efistub___flush_dcache_area = __pi___flush_dcache_area;
#ifdef CONFIG_KASAN
__efistub___memcpy = __pi_memcpy;
__efistub___memmove = __pi_memmove;
__efistub___memset = __pi_memset;
#endif
__efistub__text = _text;
__efistub__end = _end;
__efistub__edata = _edata;
#endif
#endif /* __ASM_IMAGE_H */
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