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1da177e4 LT |
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> | |
d8d4e3ae | 12 | #include <asm/inst.h> |
1da177e4 | 13 | |
fb6883e5 LY |
14 | extern int __isa_exception_epc(struct pt_regs *regs); |
15 | extern int __compute_return_epc(struct pt_regs *regs); | |
16 | extern int __compute_return_epc_for_insn(struct pt_regs *regs, | |
17 | union mips_instruction insn); | |
18 | extern int __microMIPS_compute_return_epc(struct pt_regs *regs); | |
19 | ||
20 | ||
1da177e4 LT |
21 | static inline int delay_slot(struct pt_regs *regs) |
22 | { | |
23 | return regs->cp0_cause & CAUSEF_BD; | |
24 | } | |
25 | ||
26 | static inline unsigned long exception_epc(struct pt_regs *regs) | |
27 | { | |
fb6883e5 | 28 | if (likely(!delay_slot(regs))) |
1da177e4 LT |
29 | return regs->cp0_epc; |
30 | ||
fb6883e5 LY |
31 | if (get_isa16_mode(regs->cp0_epc)) |
32 | return __isa_exception_epc(regs); | |
33 | ||
1da177e4 LT |
34 | return regs->cp0_epc + 4; |
35 | } | |
36 | ||
d8d4e3ae MS |
37 | #define BRANCH_LIKELY_TAKEN 0x0001 |
38 | ||
1da177e4 LT |
39 | static inline int compute_return_epc(struct pt_regs *regs) |
40 | { | |
fb6883e5 LY |
41 | if (get_isa16_mode(regs->cp0_epc)) { |
42 | if (cpu_has_mmips) | |
43 | return __microMIPS_compute_return_epc(regs); | |
44 | return regs->cp0_epc; | |
45 | } | |
46 | ||
1da177e4 LT |
47 | if (!delay_slot(regs)) { |
48 | regs->cp0_epc += 4; | |
49 | return 0; | |
50 | } | |
51 | ||
52 | return __compute_return_epc(regs); | |
53 | } | |
54 | ||
55 | #endif /* _ASM_BRANCH_H */ |