Michael Ellerman | aaddd3e | 2008-06-24 11:32:21 +1000 | [diff] [blame] | 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 | |
Michael Ellerman | 07630a3 | 2008-06-24 11:32:28 +1000 | [diff] [blame] | 13 | #include <asm/types.h> |
Kumar Gala | 16c57b3 | 2009-02-10 20:10:44 +0000 | [diff] [blame] | 14 | #include <asm/ppc-opcode.h> |
Michael Ellerman | b7bcda6 | 2008-06-24 11:32:35 +1000 | [diff] [blame] | 15 | |
Michael Ellerman | aaddd3e | 2008-06-24 11:32:21 +1000 | [diff] [blame] | 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 | |
Michael Ellerman | e7a5727 | 2008-06-24 11:32:22 +1000 | [diff] [blame] | 25 | unsigned int create_branch(const unsigned int *addr, |
| 26 | unsigned long target, int flags); |
Michael Ellerman | 411781a | 2008-06-24 11:32:29 +1000 | [diff] [blame] | 27 | unsigned int create_cond_branch(const unsigned int *addr, |
| 28 | unsigned long target, int flags); |
Michael Ellerman | e7a5727 | 2008-06-24 11:32:22 +1000 | [diff] [blame] | 29 | void patch_branch(unsigned int *addr, unsigned long target, int flags); |
| 30 | void patch_instruction(unsigned int *addr, unsigned int instr); |
Michael Ellerman | aaddd3e | 2008-06-24 11:32:21 +1000 | [diff] [blame] | 31 | |
Michael Ellerman | 411781a | 2008-06-24 11:32:29 +1000 | [diff] [blame] | 32 | int instr_is_relative_branch(unsigned int instr); |
| 33 | int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr); |
| 34 | unsigned long branch_target(const unsigned int *instr); |
| 35 | unsigned int translate_branch(const unsigned int *dest, |
| 36 | const unsigned int *src); |
| 37 | |
Michael Ellerman | 07630a3 | 2008-06-24 11:32:28 +1000 | [diff] [blame] | 38 | static 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 | |
Michael Ellerman | aaddd3e | 2008-06-24 11:32:21 +1000 | [diff] [blame] | 52 | #endif /* _ASM_POWERPC_CODE_PATCHING_H */ |