1 #ifndef _ASM_POWERPC_CODE_PATCHING_H
2 #define _ASM_POWERPC_CODE_PATCHING_H
5 * Copyright 2008, Michael Ellerman, IBM Corporation.
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.
13 #include <asm/types.h>
15 /* Flags for create_branch:
16 * "b" == create_branch(addr, target, 0);
17 * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE);
18 * "bl" == create_branch(addr, target, BRANCH_SET_LINK);
19 * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK);
21 #define BRANCH_SET_LINK 0x1
22 #define BRANCH_ABSOLUTE 0x2
24 unsigned int create_branch(const unsigned int *addr,
25 unsigned long target, int flags);
26 void patch_branch(unsigned int *addr, unsigned long target, int flags);
27 void patch_instruction(unsigned int *addr, unsigned int instr);
29 static inline unsigned long ppc_function_entry(void *func)
33 * On PPC64 the function pointer actually points to the function's
34 * descriptor. The first entry in the descriptor is the address
35 * of the function text.
37 return ((func_descr_t *)func)->entry;
39 return (unsigned long)func;
43 #endif /* _ASM_POWERPC_CODE_PATCHING_H */