1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Preliminary support for HW exception handing for Microblaze
4 *
5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
6 * Copyright (C) 2008-2009 PetaLogix
7 * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
8 */
9
10#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
11#define _ASM_MICROBLAZE_EXCEPTIONS_H
12
13#ifdef __KERNEL__
14
15#ifndef CONFIG_MMU
16#define EX_HANDLER_STACK_SIZ	(4*19)
17#endif
18
19#ifndef __ASSEMBLY__
20
21/* Macros to enable and disable HW exceptions in the MSR */
22/* Define MSR enable bit for HW exceptions */
23#define HWEX_MSR_BIT (1 << 8)
24
25#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
26#define __enable_hw_exceptions()					\
27	__asm__ __volatile__ ("	msrset	r0, %0;				\
28				nop;"					\
29				:					\
30				: "i" (HWEX_MSR_BIT)			\
31				: "memory")
32
33#define __disable_hw_exceptions()					\
34	__asm__ __volatile__ ("	msrclr r0, %0;				\
35				nop;"					\
36				:					\
37				: "i" (HWEX_MSR_BIT)			\
38				: "memory")
39#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
40#define __enable_hw_exceptions()					\
41	__asm__ __volatile__ ("						\
42				mfs	r12, rmsr;			\
43				nop;					\
44				ori	r12, r12, %0;			\
45				mts	rmsr, r12;			\
46				nop;"					\
47				:					\
48				: "i" (HWEX_MSR_BIT)			\
49				: "memory", "r12")
50
51#define __disable_hw_exceptions()					\
52	__asm__ __volatile__ ("						\
53				mfs	r12, rmsr;			\
54				nop;					\
55				andi	r12, r12, ~%0;			\
56				mts	rmsr, r12;			\
57				nop;"					\
58				:					\
59				: "i" (HWEX_MSR_BIT)			\
60				: "memory", "r12")
61#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
62
63asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
64							int fsr, int addr);
65
66asmlinkage void sw_exception(struct pt_regs *regs);
67void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
68
69void die(const char *str, struct pt_regs *fp, long err);
70void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
71
72#endif /*__ASSEMBLY__ */
73#endif /* __KERNEL__ */
74#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
75