#ifndef _ASM_POWERPC_JUMP_LABEL_H #define _ASM_POWERPC_JUMP_LABEL_H /* * Copyright 2010 Michael Ellerman, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #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" JUMP_ENTRY_TYPE "1b, %l[l_yes], %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" JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" ".popsection \n\t" : : "i" (&((char *)key)[branch]) : : l_yes); return false; l_yes: return true; } #ifdef CONFIG_PPC64 typedef u64 jump_label_t; #else typedef u32 jump_label_t; #endif struct jump_entry { jump_label_t code; jump_label_t target; jump_label_t key; }; #else #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 1098: nop; \ .pushsection __jump_table, "aw"; \ FTR_ENTRY_LONG 1098b, LABEL, KEY; \ .popsection #endif #endif /* _ASM_POWERPC_JUMP_LABEL_H */