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54 lines
1.4 KiB
54 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_S390_JUMP_LABEL_H |
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#define _ASM_S390_JUMP_LABEL_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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#include <linux/stringify.h> |
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#define JUMP_LABEL_NOP_SIZE 6 |
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#define JUMP_LABEL_NOP_OFFSET 2 |
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#ifdef CONFIG_CC_IS_CLANG |
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#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "i" |
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#elif __GNUC__ < 9 |
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#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "X" |
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#else |
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#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "jdd" |
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#endif |
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/* |
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* We use a brcl 0,2 instruction for jump labels at compile time so it |
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* can be easily distinguished from a hotpatch generated instruction. |
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*/ |
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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_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n" |
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".pushsection __jump_table,\"aw\"\n" |
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".balign 8\n" |
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".long 0b-.,%l[label]-.\n" |
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".quad %0+%1-.\n" |
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".popsection\n" |
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: : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key), "i" (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, bool branch) |
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{ |
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asm_volatile_goto("0: brcl 15,%l[label]\n" |
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".pushsection __jump_table,\"aw\"\n" |
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".balign 8\n" |
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".long 0b-.,%l[label]-.\n" |
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".quad %0+%1-.\n" |
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".popsection\n" |
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: : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key), "i" (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
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