arch/microblaze/include/asm/exceptions.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Preliminary support for HW exception handing for Microblaze
   4  *
   5  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   6  * Copyright (C) 2008-2009 PetaLogix
   7  * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
   8  */
   9
  10 #ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
  11 #define _ASM_MICROBLAZE_EXCEPTIONS_H
  12
  13 #ifdef __KERNEL__
  14 #ifndef __ASSEMBLY__
  15
  16 /* Macros to enable and disable HW exceptions in the MSR */
  17 /* Define MSR enable bit for HW exceptions */
  18 #define HWEX_MSR_BIT (1 << 8)
  19
  20 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  21 #define __enable_hw_exceptions()                                        \
  22         __asm__ __volatile__ (" msrset  r0, %0;                         \
  23                                 nop;"                                   \
  24                                 :                                       \
  25                                 : "i" (HWEX_MSR_BIT)                    \
  26                                 : "memory")
  27
  28 #define __disable_hw_exceptions()                                       \
  29         __asm__ __volatile__ (" msrclr r0, %0;                          \
  30                                 nop;"                                   \
  31                                 :                                       \
  32                                 : "i" (HWEX_MSR_BIT)                    \
  33                                 : "memory")
  34 #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  35 #define __enable_hw_exceptions()                                        \
  36         __asm__ __volatile__ ("                                         \
  37                                 mfs     r12, rmsr;                      \
  38                                 nop;                                    \
  39                                 ori     r12, r12, %0;                   \
  40                                 mts     rmsr, r12;                      \
  41                                 nop;"                                   \
  42                                 :                                       \
  43                                 : "i" (HWEX_MSR_BIT)                    \
  44                                 : "memory", "r12")
  45
  46 #define __disable_hw_exceptions()                                       \
  47         __asm__ __volatile__ ("                                         \
  48                                 mfs     r12, rmsr;                      \
  49                                 nop;                                    \
  50                                 andi    r12, r12, ~%0;                  \
  51                                 mts     rmsr, r12;                      \
  52                                 nop;"                                   \
  53                                 :                                       \
  54                                 : "i" (HWEX_MSR_BIT)                    \
  55                                 : "memory", "r12")
  56 #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  57
  58 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
  59                                                         int fsr, int addr);
  60
  61 asmlinkage void sw_exception(struct pt_regs *regs);
  62 void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
  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 #endif /*__ASSEMBLY__ */
  68 #endif /* __KERNEL__ */
  69 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */