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-rw-r--r--include/asm-powerpc/code-patching.h54
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diff --git a/include/asm-powerpc/code-patching.h b/include/asm-powerpc/code-patching.h
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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
13#include <asm/types.h>
14
15#define PPC_NOP_INSTR 0x60000000
16#define PPC_LWSYNC_INSTR 0x7c2004ac
17
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
27unsigned int create_branch(const unsigned int *addr,
28 unsigned long target, int flags);
29unsigned int create_cond_branch(const unsigned int *addr,
30 unsigned long target, int flags);
31void patch_branch(unsigned int *addr, unsigned long target, int flags);
32void patch_instruction(unsigned int *addr, unsigned int instr);
33
34int instr_is_relative_branch(unsigned int instr);
35int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr);
36unsigned long branch_target(const unsigned int *instr);
37unsigned int translate_branch(const unsigned int *dest,
38 const unsigned int *src);
39
40static 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
54#endif /* _ASM_POWERPC_CODE_PATCHING_H */