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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 <[email protected]>
6  * Copyright (C) 2008-2009 PetaLogix
7  * Copyright (C) 2005 John Williams <[email protected]>
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 */
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