55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
#ifndef _ASM_POWERPC_CODE_PATCHING_H
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#define _ASM_POWERPC_CODE_PATCHING_H
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/*
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* Copyright 2008, Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/types.h>
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#define PPC_NOP_INSTR 0x60000000
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#define PPC_LWSYNC_INSTR 0x7c2004ac
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/* Flags for create_branch:
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* "b" == create_branch(addr, target, 0);
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* "ba" == create_branch(addr, target, BRANCH_ABSOLUTE);
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* "bl" == create_branch(addr, target, BRANCH_SET_LINK);
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* "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK);
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*/
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#define BRANCH_SET_LINK 0x1
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#define BRANCH_ABSOLUTE 0x2
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unsigned int create_branch(const unsigned int *addr,
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unsigned long target, int flags);
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unsigned int create_cond_branch(const unsigned int *addr,
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unsigned long target, int flags);
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void patch_branch(unsigned int *addr, unsigned long target, int flags);
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void patch_instruction(unsigned int *addr, unsigned int instr);
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int instr_is_relative_branch(unsigned int instr);
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int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr);
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unsigned long branch_target(const unsigned int *instr);
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unsigned int translate_branch(const unsigned int *dest,
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const unsigned int *src);
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static inline unsigned long ppc_function_entry(void *func)
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{
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#ifdef CONFIG_PPC64
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/*
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* On PPC64 the function pointer actually points to the function's
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* descriptor. The first entry in the descriptor is the address
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* of the function text.
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*/
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return ((func_descr_t *)func)->entry;
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#else
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return (unsigned long)func;
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#endif
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}
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#endif /* _ASM_POWERPC_CODE_PATCHING_H */
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