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 
delay_slot(struct pt_regs * regs)14 static inline int delay_slot(struct pt_regs *regs)
15 {
16 	return regs->cp0_cause & CAUSEF_BD;
17 }
18 
exception_epc(struct pt_regs * regs)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 
compute_return_epc(struct pt_regs * regs)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 */
44