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code-patching.h

#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>

#define PPC_NOP_INSTR         0x60000000
#define PPC_LWSYNC_INSTR      0x7c2004ac

/* 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 */

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