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 */ 53