projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d9f5ab7b JB |
1 | /* |
| 2 | * jump label x86 support | |
| 3 | * | |
| 4 | * Copyright (C) 2009 Jason Baron <jbaron@redhat.com> | |
| 5 | * | |
| 6 | */ | |
| 7 | #include <linux/jump_label.h> | |
| 8 | #include <linux/memory.h> | |
| 9 | #include <linux/uaccess.h> | |
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/list.h> | |
| 12 | #include <linux/jhash.h> | |
| 13 | #include <linux/cpu.h> | |
| 14 | #include <asm/kprobes.h> | |
| 15 | #include <asm/alternative.h> | |
| 16 | ||
| 17 | #ifdef HAVE_JUMP_LABEL | |
| 18 | ||
| 19 | union jump_code_union { | |
| 20 | char code[JUMP_LABEL_NOP_SIZE]; | |
| 21 | struct { | |
| 22 | char jump; | |
| 23 | int offset; | |
| 24 | } __attribute__((packed)); | |
| 25 | }; | |
| 26 | ||
| 27 | void arch_jump_label_transform(struct jump_entry *entry, | |
| 28 | enum jump_label_type type) | |
| 29 | { | |
| 30 | union jump_code_union code; | |
| 31 | ||
| 32 | if (type == JUMP_LABEL_ENABLE) { | |
| 33 | code.jump = 0xe9; | |
| 34 | code.offset = entry->target - | |
| 35 | (entry->code + JUMP_LABEL_NOP_SIZE); | |
| 36 | } else | |
| 37 | memcpy(&code, ideal_nop5, JUMP_LABEL_NOP_SIZE); | |
| 38 | get_online_cpus(); | |
| 39 | mutex_lock(&text_mutex); | |
| 40 | text_poke_smp((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE); | |
| 41 | mutex_unlock(&text_mutex); | |
| 42 | put_online_cpus(); | |
| 43 | } | |
| 44 | ||
| 45 | void arch_jump_label_text_poke_early(jump_label_t addr) | |
| 46 | { | |
| 47 | text_poke_early((void *)addr, ideal_nop5, JUMP_LABEL_NOP_SIZE); | |
| 48 | } | |
| 49 | ||
| 50 | #endif |