Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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);
29int patch_branch(unsigned int *addr, unsigned long target, int flags);
30int 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#ifdef CONFIG_PPC_BOOK3E_64
38void __patch_exception(int exc, unsigned long addr);
39#define patch_exception(exc, name) do { \
40 extern unsigned int name; \
41 __patch_exception((exc), (unsigned long)&name); \
42} while (0)
43#endif
44
45static inline unsigned long ppc_function_entry(void *func)
46{
47#ifdef CONFIG_PPC64
48 /*
49 * On PPC64 the function pointer actually points to the function's
50 * descriptor. The first entry in the descriptor is the address
51 * of the function text.
52 */
53 return ((func_descr_t *)func)->entry;
54#else
55 return (unsigned long)func;
56#endif
57}
58
59#endif /* _ASM_POWERPC_CODE_PATCHING_H */