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60 lines
1.4 KiB
60 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2020 Emil Renner Berthing |
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* |
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* Based on arch/arm64/include/asm/jump_label.h |
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*/ |
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#ifndef __ASM_JUMP_LABEL_H |
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#define __ASM_JUMP_LABEL_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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#include <asm/asm.h> |
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#define JUMP_LABEL_NOP_SIZE 4 |
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static __always_inline bool arch_static_branch(struct static_key *key, |
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bool branch) |
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{ |
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asm_volatile_goto( |
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" .option push \n\t" |
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" .option norelax \n\t" |
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" .option norvc \n\t" |
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"1: nop \n\t" |
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" .option pop \n\t" |
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" .pushsection __jump_table, \"aw\" \n\t" |
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" .align " RISCV_LGPTR " \n\t" |
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" .long 1b - ., %l[label] - . \n\t" |
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" " RISCV_PTR " %0 - . \n\t" |
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" .popsection \n\t" |
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: : "i"(&((char *)key)[branch]) : : label); |
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return false; |
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label: |
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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, |
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bool branch) |
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{ |
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asm_volatile_goto( |
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" .option push \n\t" |
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" .option norelax \n\t" |
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" .option norvc \n\t" |
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"1: jal zero, %l[label] \n\t" |
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" .option pop \n\t" |
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" .pushsection __jump_table, \"aw\" \n\t" |
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" .align " RISCV_LGPTR " \n\t" |
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" .long 1b - ., %l[label] - . \n\t" |
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" " RISCV_PTR " %0 - . \n\t" |
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" .popsection \n\t" |
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: : "i"(&((char *)key)[branch]) : : label); |
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return false; |
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label: |
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return true; |
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} |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_JUMP_LABEL_H */
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