microblaze_v8: exception handling
[linux-2.6.git] / arch / microblaze / include / asm / exceptions.h
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 #if defined(CONFIG_XMON)
65 extern void xmon(struct pt_regs *regs);
66 extern int xmon_bpt(struct pt_regs *regs);
67 extern int xmon_sstep(struct pt_regs *regs);
68 extern int xmon_iabr_match(struct pt_regs *regs);
69 extern int xmon_dabr_match(struct pt_regs *regs);
70 extern void (*xmon_fault_handler)(struct pt_regs *regs);
71
72 void (*debugger)(struct pt_regs *regs) = xmon;
73 int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
74 int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
75 int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
76 int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
77 void (*debugger_fault_handler)(struct pt_regs *regs);
78 #elif defined(CONFIG_KGDB)
79 void (*debugger)(struct pt_regs *regs);
80 int (*debugger_bpt)(struct pt_regs *regs);
81 int (*debugger_sstep)(struct pt_regs *regs);
82 int (*debugger_iabr_match)(struct pt_regs *regs);
83 int (*debugger_dabr_match)(struct pt_regs *regs);
84 void (*debugger_fault_handler)(struct pt_regs *regs);
85 #else
86 #define debugger(regs)                  do { } while (0)
87 #define debugger_bpt(regs)              0
88 #define debugger_sstep(regs)            0
89 #define debugger_iabr_match(regs)       0
90 #define debugger_dabr_match(regs)       0
91 #define debugger_fault_handler          ((void (*)(struct pt_regs *))0)
92 #endif
93
94 #endif /*__ASSEMBLY__ */
95 #endif /* __KERNEL__ */
96 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */