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aaddd3ea ME |
1 | #ifndef _ASM_POWERPC_CODE_PATCHING_H |
2 | #define _ASM_POWERPC_CODE_PATCHING_H | |
3 | ||
4 | /* | |
5 | * Copyright 2008, Michael Ellerman, IBM Corporation. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
07630a37 ME |
13 | #include <asm/types.h> |
14 | ||
2d1b2027 KG |
15 | #define PPC_NOP_INSTR 0x60000000 |
16 | #define PPC_LWSYNC_INSTR 0x7c2004ac | |
b7bcda63 | 17 | |
aaddd3ea ME |
18 | /* Flags for create_branch: |
19 | * "b" == create_branch(addr, target, 0); | |
20 | * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE); | |
21 | * "bl" == create_branch(addr, target, BRANCH_SET_LINK); | |
22 | * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK); | |
23 | */ | |
24 | #define BRANCH_SET_LINK 0x1 | |
25 | #define BRANCH_ABSOLUTE 0x2 | |
26 | ||
e7a57273 ME |
27 | unsigned int create_branch(const unsigned int *addr, |
28 | unsigned long target, int flags); | |
411781a2 ME |
29 | unsigned int create_cond_branch(const unsigned int *addr, |
30 | unsigned long target, int flags); | |
e7a57273 ME |
31 | void patch_branch(unsigned int *addr, unsigned long target, int flags); |
32 | void patch_instruction(unsigned int *addr, unsigned int instr); | |
aaddd3ea | 33 | |
411781a2 ME |
34 | int instr_is_relative_branch(unsigned int instr); |
35 | int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr); | |
36 | unsigned long branch_target(const unsigned int *instr); | |
37 | unsigned int translate_branch(const unsigned int *dest, | |
38 | const unsigned int *src); | |
39 | ||
07630a37 ME |
40 | static inline unsigned long ppc_function_entry(void *func) |
41 | { | |
42 | #ifdef CONFIG_PPC64 | |
43 | /* | |
44 | * On PPC64 the function pointer actually points to the function's | |
45 | * descriptor. The first entry in the descriptor is the address | |
46 | * of the function text. | |
47 | */ | |
48 | return ((func_descr_t *)func)->entry; | |
49 | #else | |
50 | return (unsigned long)func; | |
51 | #endif | |
52 | } | |
53 | ||
aaddd3ea | 54 | #endif /* _ASM_POWERPC_CODE_PATCHING_H */ |