diff options
Diffstat (limited to 'arch/powerpc/include/asm/jump_label.h')
| -rw-r--r-- | arch/powerpc/include/asm/jump_label.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h new file mode 100644 index 000000000..93ce3ec25 --- /dev/null +++ b/arch/powerpc/include/asm/jump_label.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_JUMP_LABEL_H +#define _ASM_POWERPC_JUMP_LABEL_H + +/* + * Copyright 2010 Michael Ellerman, IBM Corp. + */ + +#ifndef __ASSEMBLY__ +#include <linux/types.h> + +#include <asm/feature-fixups.h> +#include <asm/asm-const.h> + +#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) +#define JUMP_LABEL_NOP_SIZE 4 + +static __always_inline bool arch_static_branch(struct static_key *key, bool branch) +{ + asm_volatile_goto("1:\n\t" + "nop # arch_static_branch\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".long 1b - ., %l[l_yes] - .\n\t" + JUMP_ENTRY_TYPE "%c0 - .\n\t" + ".popsection \n\t" + : : "i" (&((char *)key)[branch]) : : l_yes); + + return false; +l_yes: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) +{ + asm_volatile_goto("1:\n\t" + "b %l[l_yes] # arch_static_branch_jump\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".long 1b - ., %l[l_yes] - .\n\t" + JUMP_ENTRY_TYPE "%c0 - .\n\t" + ".popsection \n\t" + : : "i" (&((char *)key)[branch]) : : l_yes); + + return false; +l_yes: + return true; +} + +#else +#define ARCH_STATIC_BRANCH(LABEL, KEY) \ +1098: nop; \ + .pushsection __jump_table, "aw"; \ + .long 1098b - ., LABEL - .; \ + FTR_ENTRY_LONG KEY - .; \ + .popsection +#endif + +#endif /* _ASM_POWERPC_JUMP_LABEL_H */ |