branch.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1996, 1997, 1998, 2001 by Ralf Baechle
 */
#ifndef _ASM_BRANCH_H
#define _ASM_BRANCH_H

#include <asm/ptrace.h>
#include <asm/inst.h>

static inline int delay_slot(struct pt_regs *regs)
{
    return regs->cp0_cause & CAUSEF_BD;
}

static inline unsigned long exception_epc(struct pt_regs *regs)
{
    if (!delay_slot(regs))
        return regs->cp0_epc;

    return regs->cp0_epc + 4;
}

#define BRANCH_LIKELY_TAKEN 0x0001

extern int __compute_return_epc(struct pt_regs *regs);
extern int __compute_return_epc_for_insn(struct pt_regs *regs,
                     union mips_instruction insn);

static inline int compute_return_epc(struct pt_regs *regs)
{
    if (!delay_slot(regs)) {
        regs->cp0_epc += 4;
        return 0;
    }

    return __compute_return_epc(regs);
}

#endif /* _ASM_BRANCH_H */