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