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 
63 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
64 							int fsr, int addr);
65 
66 asmlinkage void sw_exception(struct pt_regs *regs);
67 void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
68 
69 void die(const char *str, struct pt_regs *fp, long err);
70 void _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