projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5373db88 JG |
1 | #ifndef _ASM_S390_JUMP_LABEL_H |
| 2 | #define _ASM_S390_JUMP_LABEL_H | |
| 3 | ||
| 55dd0df7 AB |
4 | #ifndef __ASSEMBLY__ |
| 5 | ||
| 5373db88 JG |
6 | #include <linux/types.h> |
| 7 | ||
| 8 | #define JUMP_LABEL_NOP_SIZE 6 | |
| d5caa4db | 9 | #define JUMP_LABEL_NOP_OFFSET 2 |
| 5373db88 | 10 | |
| d5caa4db HC |
11 | /* |
| 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. | |
| 14 | */ | |
| 11276d53 | 15 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
| 5373db88 | 16 | { |
| d5caa4db | 17 | asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n" |
| 5373db88 | 18 | ".pushsection __jump_table, \"aw\"\n" |
| 5a79859a HC |
19 | ".balign 8\n" |
| 20 | ".quad 0b, %l[label], %0\n" | |
| 5373db88 | 21 | ".popsection\n" |
| 11276d53 PZ |
22 | : : "X" (&((char *)key)[branch]) : : label); |
| 23 | ||
| 24 | return false; | |
| 25 | label: | |
| 26 | return true; | |
| 27 | } | |
| 28 | ||
| 29 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) | |
| 30 | { | |
| 31 | asm_volatile_goto("0: brcl 15, %l[label]\n" | |
| 32 | ".pushsection __jump_table, \"aw\"\n" | |
| 33 | ".balign 8\n" | |
| 34 | ".quad 0b, %l[label], %0\n" | |
| 35 | ".popsection\n" | |
| 36 | : : "X" (&((char *)key)[branch]) : : label); | |
| 37 | ||
| 5373db88 JG |
38 | return false; |
| 39 | label: | |
| 40 | return true; | |
| 41 | } | |
| 42 | ||
| 43 | typedef unsigned long jump_label_t; | |
| 44 | ||
| 45 | struct jump_entry { | |
| 46 | jump_label_t code; | |
| 47 | jump_label_t target; | |
| 48 | jump_label_t key; | |
| 49 | }; | |
| 50 | ||
| 55dd0df7 | 51 | #endif /* __ASSEMBLY__ */ |
| 5373db88 | 52 | #endif |