| #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); |
| void patch_branch(unsigned int *addr, unsigned long target, int flags); |
| void 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); |
| |
| 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 */ |