Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_ARM_JUMP_LABEL_H
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#define _ASM_ARM_JUMP_LABEL_H
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <asm/unified.h>
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#define JUMP_LABEL_NOP_SIZE 4
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/* This macro is also expanded on the Rust side. */
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#define ARCH_STATIC_BRANCH_ASM(key, label) \
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"1:\n\t" \
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WASM(nop) "\n\t" \
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".pushsection __jump_table, \"aw\"\n\t" \
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".word 1b, " label ", " key "\n\t" \
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".popsection\n\t" \
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static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
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{
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asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
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: : "i" (&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
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{
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asm goto("1:\n\t"
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WASM(b) " %l[l_yes]\n\t"
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".pushsection __jump_table, \"aw\"\n\t"
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".word 1b, %l[l_yes], %c0\n\t"
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".popsection\n\t"
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: : "i" (&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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typedef u32 jump_label_t;
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struct jump_entry {
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jump_label_t code;
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jump_label_t target;
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jump_label_t key;
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};
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#endif /* __ASSEMBLY__ */
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#endif
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