mirror of https://gitee.com/openkylin/linux.git
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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/*
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* Linker script macros to generate Image header fields.
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*
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* Copyright (C) 2014 ARM Ltd.
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*
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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 version 2 as
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* published by the Free Software Foundation.
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*
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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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*
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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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#ifndef __ASM_IMAGE_H
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#define __ASM_IMAGE_H
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#ifndef LINKER_SCRIPT
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#error This file should only be included in vmlinux.lds.S
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#endif
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/*
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* There aren't any ELF relocations we can use to endian-swap values known only
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* at link time (e.g. the subtraction of two symbol addresses), so we must get
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* the linker to endian-swap certain values before emitting them.
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*/
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define DATA_LE64(data) \
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((((data) & 0x00000000000000ff) << 56) | \
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(((data) & 0x000000000000ff00) << 40) | \
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(((data) & 0x0000000000ff0000) << 24) | \
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(((data) & 0x00000000ff000000) << 8) | \
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(((data) & 0x000000ff00000000) >> 8) | \
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(((data) & 0x0000ff0000000000) >> 24) | \
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(((data) & 0x00ff000000000000) >> 40) | \
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(((data) & 0xff00000000000000) >> 56))
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#else
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#define DATA_LE64(data) ((data) & 0xffffffffffffffff)
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#endif
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define __HEAD_FLAG_BE 1
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#else
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#define __HEAD_FLAG_BE 0
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#endif
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#define __HEAD_FLAGS (__HEAD_FLAG_BE << 0)
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/*
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* These will output as part of the Image header, which should be little-endian
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* regardless of the endianness of the kernel. While constant values could be
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* endian swapped in head.S, all are done here for consistency.
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*/
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#define HEAD_SYMBOLS \
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_kernel_size_le = DATA_LE64(_end - _text); \
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_kernel_offset_le = DATA_LE64(TEXT_OFFSET); \
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_kernel_flags_le = DATA_LE64(__HEAD_FLAGS);
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#endif /* __ASM_IMAGE_H */
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