Linux kernel mirror (for testing)
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linux
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
61asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
62 int fsr, int addr);
63
64void die(const char *str, struct pt_regs *fp, long err);
65void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
66
67#if defined(CONFIG_XMON)
68extern void xmon(struct pt_regs *regs);
69extern int xmon_bpt(struct pt_regs *regs);
70extern int xmon_sstep(struct pt_regs *regs);
71extern int xmon_iabr_match(struct pt_regs *regs);
72extern int xmon_dabr_match(struct pt_regs *regs);
73extern void (*xmon_fault_handler)(struct pt_regs *regs);
74
75void (*debugger)(struct pt_regs *regs) = xmon;
76int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
77int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
78int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
79int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
80void (*debugger_fault_handler)(struct pt_regs *regs);
81#elif defined(CONFIG_KGDB)
82void (*debugger)(struct pt_regs *regs);
83int (*debugger_bpt)(struct pt_regs *regs);
84int (*debugger_sstep)(struct pt_regs *regs);
85int (*debugger_iabr_match)(struct pt_regs *regs);
86int (*debugger_dabr_match)(struct pt_regs *regs);
87void (*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 */