arch/mips/include/asm/branch.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1996, 1997, 1998, 2001 by Ralf Baechle
   7  */
   8 #ifndef _ASM_BRANCH_H
   9 #define _ASM_BRANCH_H
  10
  11 #include <asm/ptrace.h>
  12 #include <asm/inst.h>
  13
  14 static inline int delay_slot(struct pt_regs *regs)
  15 {
  16         return regs->cp0_cause & CAUSEF_BD;
  17 }
  18
  19 static inline unsigned long exception_epc(struct pt_regs *regs)
  20 {
  21         if (!delay_slot(regs))
  22                 return regs->cp0_epc;
  23
  24         return regs->cp0_epc + 4;
  25 }
  26
  27 #define BRANCH_LIKELY_TAKEN 0x0001
  28
  29 extern int __compute_return_epc(struct pt_regs *regs);
  30 extern int __compute_return_epc_for_insn(struct pt_regs *regs,
  31                                          union mips_instruction insn);
  32
  33 static inline int compute_return_epc(struct pt_regs *regs)
  34 {
  35         if (!delay_slot(regs)) {
  36                 regs->cp0_epc += 4;
  37                 return 0;
  38         }
  39
  40         return __compute_return_epc(regs);
  41 }
  42
  43 #endif /* _ASM_BRANCH_H */