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 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 */