1 /*
2  * Preliminary support for HW exception handing for Microblaze
3  *
4  * Copyright (C) 2008 Michal Simek
5  * Copyright (C) 2008 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 #ifndef __ASSEMBLY__
18 
19 /* Macros to enable and disable HW exceptions in the MSR */
20 /* Define MSR enable bit for HW exceptions */
21 #define HWEX_MSR_BIT (1 << 8)
22 
23 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
24 #define __enable_hw_exceptions()					\
25 	__asm__ __volatile__ ("	msrset	r0, %0;				\
26 				nop;"					\
27 				:					\
28 				: "i" (HWEX_MSR_BIT)			\
29 				: "memory")
30 
31 #define __disable_hw_exceptions()					\
32 	__asm__ __volatile__ ("	msrclr r0, %0;				\
33 				nop;"					\
34 				:					\
35 				: "i" (HWEX_MSR_BIT)			\
36 				: "memory")
37 #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
38 #define __enable_hw_exceptions()					\
39 	__asm__ __volatile__ ("						\
40 				mfs	r12, rmsr;			\
41 				nop;					\
42 				ori	r12, r12, %0;			\
43 				mts	rmsr, r12;			\
44 				nop;"					\
45 				:					\
46 				: "i" (HWEX_MSR_BIT)			\
47 				: "memory", "r12")
48 
49 #define __disable_hw_exceptions()					\
50 	__asm__ __volatile__ ("						\
51 				mfs	r12, rmsr;			\
52 				nop;					\
53 				andi	r12, r12, ~%0;			\
54 				mts	rmsr, r12;			\
55 				nop;"					\
56 				:					\
57 				: "i" (HWEX_MSR_BIT)			\
58 				: "memory", "r12")
59 #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
60 
61 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
62 							int fsr, int addr);
63 
64 void die(const char *str, struct pt_regs *fp, long err);
65 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
66 
67 #if defined(CONFIG_XMON)
68 extern void xmon(struct pt_regs *regs);
69 extern int xmon_bpt(struct pt_regs *regs);
70 extern int xmon_sstep(struct pt_regs *regs);
71 extern int xmon_iabr_match(struct pt_regs *regs);
72 extern int xmon_dabr_match(struct pt_regs *regs);
73 extern void (*xmon_fault_handler)(struct pt_regs *regs);
74 
75 void (*debugger)(struct pt_regs *regs) = xmon;
76 int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
77 int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
78 int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
79 int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
80 void (*debugger_fault_handler)(struct pt_regs *regs);
81 #elif defined(CONFIG_KGDB)
82 void (*debugger)(struct pt_regs *regs);
83 int (*debugger_bpt)(struct pt_regs *regs);
84 int (*debugger_sstep)(struct pt_regs *regs);
85 int (*debugger_iabr_match)(struct pt_regs *regs);
86 int (*debugger_dabr_match)(struct pt_regs *regs);
87 void (*debugger_fault_handler)(struct pt_regs *regs);
88 #else
89 #define debugger(regs)			do { } while (0)
90 #define debugger_bpt(regs)		0
91 #define debugger_sstep(regs)		0
92 #define debugger_iabr_match(regs)	0
93 #define debugger_dabr_match(regs)	0
94 #define debugger_fault_handler		((void (*)(struct pt_regs *))0)
95 #endif
96 
97 #endif /*__ASSEMBLY__ */
98 #endif /* __KERNEL__ */
99 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
100