From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/s390/include/asm/jump_label.h | 55 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 arch/s390/include/asm/jump_label.h (limited to 'arch/s390/include/asm/jump_label.h') diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h new file mode 100644 index 000000000..895f774bb --- /dev/null +++ b/arch/s390/include/asm/jump_label.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_JUMP_LABEL_H +#define _ASM_S390_JUMP_LABEL_H + +#define HAVE_JUMP_LABEL_BATCH + +#ifndef __ASSEMBLY__ + +#include +#include + +#define JUMP_LABEL_NOP_SIZE 6 + +#ifdef CONFIG_CC_IS_CLANG +#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "i" +#elif __GNUC__ < 9 +#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "X" +#else +#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "jdd" +#endif + +/* + * We use a brcl 0, instruction for jump labels so it + * can be easily distinguished from a hotpatch generated instruction. + */ +static __always_inline bool arch_static_branch(struct static_key *key, bool branch) +{ + asm_volatile_goto("0: brcl 0,%l[label]\n" + ".pushsection __jump_table,\"aw\"\n" + ".balign 8\n" + ".long 0b-.,%l[label]-.\n" + ".quad %0+%1-.\n" + ".popsection\n" + : : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key), "i" (branch) : : label); + return false; +label: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) +{ + asm_volatile_goto("0: brcl 15,%l[label]\n" + ".pushsection __jump_table,\"aw\"\n" + ".balign 8\n" + ".long 0b-.,%l[label]-.\n" + ".quad %0+%1-.\n" + ".popsection\n" + : : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key), "i" (branch) : : label); + return false; +label: + return true; +} + +#endif /* __ASSEMBLY__ */ +#endif -- cgit v1.2.3