#ifndef _ASM_POWERPC_CODE_PATCHING_H #define _ASM_POWERPC_CODE_PATCHING_H /* * Copyright 2008, Michael Ellerman, IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <asm/types.h> #include <asm/ppc-opcode.h> /* Flags for create_branch: * "b" == create_branch(addr, target, 0); * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE); * "bl" == create_branch(addr, target, BRANCH_SET_LINK); * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK); */ #define BRANCH_SET_LINK 0x1 #define BRANCH_ABSOLUTE 0x2 unsigned int create_branch(const unsigned int *addr, unsigned long target, int flags); unsigned int create_cond_branch(const unsigned int *addr, unsigned long target, int flags); int patch_branch(unsigned int *addr, unsigned long target, int flags); int patch_instruction(unsigned int *addr, unsigned int instr); int instr_is_relative_branch(unsigned int instr); int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr); unsigned long branch_target(const unsigned int *instr); unsigned int translate_branch(const unsigned int *dest, const unsigned int *src); #ifdef CONFIG_PPC_BOOK3E_64 void __patch_exception(int exc, unsigned long addr); #define patch_exception(exc, name) do { \ extern unsigned int name; \ __patch_exception((exc), (unsigned long)&name); \ } while (0) #endif static inline unsigned long ppc_function_entry(void *func) { #ifdef CONFIG_PPC64 /* * On PPC64 the function pointer actually points to the function's * descriptor. The first entry in the descriptor is the address * of the function text. */ return ((func_descr_t *)func)->entry; #else return (unsigned long)func; #endif } #endif /* _ASM_POWERPC_CODE_PATCHING_H */