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/arch/powerpc/include/asm/code-patching.h

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C Header | 52 lines | 26 code | 7 blank | 19 comment | 0 complexity | f34e59d96b7bc9be8e2a8925ce709cff MD5 | raw file
 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#include <asm/ppc-opcode.h>
15
16/* Flags for create_branch:
17 * "b"   == create_branch(addr, target, 0);
18 * "ba"  == create_branch(addr, target, BRANCH_ABSOLUTE);
19 * "bl"  == create_branch(addr, target, BRANCH_SET_LINK);
20 * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK);
21 */
22#define BRANCH_SET_LINK	0x1
23#define BRANCH_ABSOLUTE	0x2
24
25unsigned int create_branch(const unsigned int *addr,
26			   unsigned long target, int flags);
27unsigned int create_cond_branch(const unsigned int *addr,
28				unsigned long target, int flags);
29void patch_branch(unsigned int *addr, unsigned long target, int flags);
30void patch_instruction(unsigned int *addr, unsigned int instr);
31
32int instr_is_relative_branch(unsigned int instr);
33int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr);
34unsigned long branch_target(const unsigned int *instr);
35unsigned int translate_branch(const unsigned int *dest,
36			      const unsigned int *src);
37
38static inline unsigned long ppc_function_entry(void *func)
39{
40#ifdef CONFIG_PPC64
41	/*
42	 * On PPC64 the function pointer actually points to the function's
43	 * descriptor. The first entry in the descriptor is the address
44	 * of the function text.
45	 */
46	return ((func_descr_t *)func)->entry;
47#else
48	return (unsigned long)func;
49#endif
50}
51
52#endif /* _ASM_POWERPC_CODE_PATCHING_H */