1 #ifndef _ASM_S390_JUMP_LABEL_H
2 #define _ASM_S390_JUMP_LABEL_H
6 #include <linux/types.h>
8 #define JUMP_LABEL_NOP_SIZE 6
9 #define JUMP_LABEL_NOP_OFFSET 2
12 * We use a brcl 0,2 instruction for jump labels at compile time so it
13 * can be easily distinguished from a hotpatch generated instruction.
15 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
17 asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
18 ".pushsection __jump_table, \"aw\"\n"
20 ".quad 0b, %l[label], %0\n"
22 : : "X" (&((char *)key)[branch]) : : label);
29 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
31 asm_volatile_goto("0: brcl 15, %l[label]\n"
32 ".pushsection __jump_table, \"aw\"\n"
34 ".quad 0b, %l[label], %0\n"
36 : : "X" (&((char *)key)[branch]) : : label);
43 typedef unsigned long jump_label_t;
51 #endif /* __ASSEMBLY__ */