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Diffstat (limited to 'arch/mips/include/asm/jump_label.h')
-rw-r--r-- | arch/mips/include/asm/jump_label.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h new file mode 100644 index 0000000000..c5c6864e64 --- /dev/null +++ b/arch/mips/include/asm/jump_label.h @@ -0,0 +1,77 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2010 Cavium Networks, Inc. + */ +#ifndef _ASM_MIPS_JUMP_LABEL_H +#define _ASM_MIPS_JUMP_LABEL_H + +#define arch_jump_label_transform_static arch_jump_label_transform + +#ifndef __ASSEMBLY__ + +#include <linux/types.h> +#include <asm/isa-rev.h> + +#define JUMP_LABEL_NOP_SIZE 4 + +#ifdef CONFIG_64BIT +#define WORD_INSN ".dword" +#else +#define WORD_INSN ".word" +#endif + +#ifdef CONFIG_CPU_MICROMIPS +# define B_INSN "b32" +# define J_INSN "j32" +#elif MIPS_ISA_REV >= 6 +# define B_INSN "bc" +# define J_INSN "bc" +#else +# define B_INSN "b" +# define J_INSN "j" +#endif + +static __always_inline bool arch_static_branch(struct static_key *key, bool branch) +{ + asm_volatile_goto("1:\t" B_INSN " 2f\n\t" + "2:\t.insn\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + WORD_INSN " 1b, %l[l_yes], %0\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:\t" J_INSN " %l[l_yes]\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + WORD_INSN " 1b, %l[l_yes], %0\n\t" + ".popsection\n\t" + : : "i" (&((char *)key)[branch]) : : l_yes); + + return false; +l_yes: + return true; +} + +#ifdef CONFIG_64BIT +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; +}; + +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_MIPS_JUMP_LABEL_H */ |