122 lines
4.3 KiB
C
122 lines
4.3 KiB
C
/*
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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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* Note that, in order for this to work when building the ELF64 PIE executable
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* (for KASLR), these values should not be referenced via R_AARCH64_ABS64
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* relocations, since these are fixed up at runtime rather than at build time
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* when PIE is in effect. So we need to split them up in 32-bit high and low
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* words.
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*/
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define DATA_LE32(data) \
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((((data) & 0x000000ff) << 24) | \
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(((data) & 0x0000ff00) << 8) | \
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(((data) & 0x00ff0000) >> 8) | \
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(((data) & 0xff000000) >> 24))
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#else
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#define DATA_LE32(data) ((data) & 0xffffffff)
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#endif
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#define DEFINE_IMAGE_LE64(sym, data) \
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sym##_lo32 = DATA_LE32((data) & 0xffffffff); \
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sym##_hi32 = DATA_LE32((data) >> 32)
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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_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)
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#define __HEAD_FLAG_PHYS_BASE 1
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#define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \
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(__HEAD_FLAG_PAGE_SIZE << 1) | \
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(__HEAD_FLAG_PHYS_BASE << 3))
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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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DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \
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DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \
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DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS);
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#ifdef CONFIG_EFI
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__efistub_stext_offset = stext - _text;
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/*
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* Prevent the symbol aliases below from being emitted into the kallsyms
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* table, by forcing them to be absolute symbols (which are conveniently
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* ignored by scripts/kallsyms) rather than section relative symbols.
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* The distinction is only relevant for partial linking, and only for symbols
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* that are defined within a section declaration (which is not the case for
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* the definitions below) so the resulting values will be identical.
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*/
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#define KALLSYMS_HIDE(sym) ABSOLUTE(sym)
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/*
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* The EFI stub has its own symbol namespace prefixed by __efistub_, to
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* isolate it from the kernel proper. The following symbols are legally
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* accessed by the stub, so provide some aliases to make them accessible.
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* Only include data symbols here, or text symbols of functions that are
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* guaranteed to be safe when executed at another offset than they were
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* linked at. The routines below are all implemented in assembler in a
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* position independent manner
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*/
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__efistub_memcmp = KALLSYMS_HIDE(__pi_memcmp);
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__efistub_memchr = KALLSYMS_HIDE(__pi_memchr);
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__efistub_memcpy = KALLSYMS_HIDE(__pi_memcpy);
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__efistub_memmove = KALLSYMS_HIDE(__pi_memmove);
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__efistub_memset = KALLSYMS_HIDE(__pi_memset);
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__efistub_strlen = KALLSYMS_HIDE(__pi_strlen);
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__efistub_strnlen = KALLSYMS_HIDE(__pi_strnlen);
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__efistub_strcmp = KALLSYMS_HIDE(__pi_strcmp);
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__efistub_strncmp = KALLSYMS_HIDE(__pi_strncmp);
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__efistub___flush_dcache_area = KALLSYMS_HIDE(__pi___flush_dcache_area);
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#ifdef CONFIG_KASAN
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__efistub___memcpy = KALLSYMS_HIDE(__pi_memcpy);
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__efistub___memmove = KALLSYMS_HIDE(__pi_memmove);
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__efistub___memset = KALLSYMS_HIDE(__pi_memset);
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#endif
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__efistub__text = KALLSYMS_HIDE(_text);
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__efistub__end = KALLSYMS_HIDE(_end);
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__efistub__edata = KALLSYMS_HIDE(_edata);
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__efistub_screen_info = KALLSYMS_HIDE(screen_info);
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#endif
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#endif /* __ASM_IMAGE_H */
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