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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-05-05 09:57:21 +02:00
Siddharth Nayyar
55fcb926b6
Read kflagstab section for vmlinux and modules to determine whether kernel symbols are GPL only. This patch eliminates the need for fragmenting the ksymtab for infering the value of GPL-only symbol flag, henceforth stop populating *_gpl versions of the ksymtab and kcrctab in modpost. Signed-off-by: Siddharth Nayyar <sidnayyar@google.com> Reviewed-by: Petr Pavlu <petr.pavlu@suse.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Please do not include this explicitly.
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* This is used by C files generated by modpost.
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*/
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#ifndef __LINUX_EXPORT_INTERNAL_H__
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#define __LINUX_EXPORT_INTERNAL_H__
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#include <linux/compiler.h>
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#include <linux/types.h>
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#if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)
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/*
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* relative reference: this reduces the size by half on 64-bit architectures,
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* and eliminates the need for absolute relocations that require runtime
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* processing on relocatable kernels.
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*/
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#define __KSYM_ALIGN ".balign 4"
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#define __KSYM_REF(sym) ".long " #sym "- ."
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#elif defined(CONFIG_64BIT)
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#define __KSYM_ALIGN ".balign 8"
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#define __KSYM_REF(sym) ".quad " #sym
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#else
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#define __KSYM_ALIGN ".balign 4"
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#define __KSYM_REF(sym) ".long " #sym
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#endif
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/*
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* For every exported symbol, do the following:
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*
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* - Put the name of the symbol and namespace (empty string "" for none) in
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* __ksymtab_strings.
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* - Place a struct kernel_symbol entry in the __ksymtab section.
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*
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* Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
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* section flag requires it. Use '%progbits' instead of '@progbits' since the
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* former apparently works on all arches according to the binutils source.
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*/
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#define __KSYMTAB(name, sym, ns) \
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asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1" "\n" \
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"__kstrtab_" #name ":" "\n" \
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" .asciz \"" #name "\"" "\n" \
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"__kstrtabns_" #name ":" "\n" \
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" .asciz \"" ns "\"" "\n" \
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" .previous" "\n" \
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" .section \"___ksymtab+" #name "\", \"a\"" "\n" \
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__KSYM_ALIGN "\n" \
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"__ksymtab_" #name ":" "\n" \
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__KSYM_REF(sym) "\n" \
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__KSYM_REF(__kstrtab_ ##name) "\n" \
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__KSYM_REF(__kstrtabns_ ##name) "\n" \
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" .previous" "\n" \
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)
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#if defined(CONFIG_PARISC) && defined(CONFIG_64BIT)
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#define KSYM_FUNC(name) P%name
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#else
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#define KSYM_FUNC(name) name
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#endif
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#define KSYMTAB_FUNC(name, ns) __KSYMTAB(name, KSYM_FUNC(name), ns)
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#define KSYMTAB_DATA(name, ns) __KSYMTAB(name, name, ns)
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#define SYMBOL_CRC(sym, crc) \
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asm(" .section \"___kcrctab+" #sym "\",\"a\"" "\n" \
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" .balign 4" "\n" \
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"__crc_" #sym ":" "\n" \
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" .long " #crc "\n" \
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" .previous" "\n" \
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)
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#define SYMBOL_FLAGS(sym, flags) \
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asm(" .section \"___kflagstab+" #sym "\",\"a\"" "\n" \
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"__flags_" #sym ":" "\n" \
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" .byte " #flags "\n" \
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" .previous" "\n" \
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)
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#endif /* __LINUX_EXPORT_INTERNAL_H__ */
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