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
  15 #ifndef CONFIG_MMU
  16 #define EX_HANDLER_STACK_SIZ    (4*19)
  17 #endif
  18
  19 #ifndef __ASSEMBLY__
  20
  21 /* Macros to enable and disable HW exceptions in the MSR */
  22 /* Define MSR enable bit for HW exceptions */
  23 #define HWEX_MSR_BIT (1 << 8)
  24
  25 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  26 #define __enable_hw_exceptions()                                        \
  27         __asm__ __volatile__ (" msrset  r0, %0;                         \
  28                                 nop;"                                   \
  29                                 :                                       \
  30                                 : "i" (HWEX_MSR_BIT)                    \
  31                                 : "memory")
  32
  33 #define __disable_hw_exceptions()                                       \
  34         __asm__ __volatile__ (" msrclr r0, %0;                          \
  35                                 nop;"                                   \
  36                                 :                                       \
  37                                 : "i" (HWEX_MSR_BIT)                    \
  38                                 : "memory")
  39 #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  40 #define __enable_hw_exceptions()                                        \
  41         __asm__ __volatile__ ("                                         \
  42                                 mfs     r12, rmsr;                      \
  43                                 nop;                                    \
  44                                 ori     r12, r12, %0;                   \
  45                                 mts     rmsr, r12;                      \
  46                                 nop;"                                   \
  47                                 :                                       \
  48                                 : "i" (HWEX_MSR_BIT)                    \
  49                                 : "memory", "r12")
  50
  51 #define __disable_hw_exceptions()                                       \
  52         __asm__ __volatile__ ("                                         \
  53                                 mfs     r12, rmsr;                      \
  54                                 nop;                                    \
  55                                 andi    r12, r12, ~%0;                  \
  56                                 mts     rmsr, r12;                      \
  57                                 nop;"                                   \
  58                                 :                                       \
  59                                 : "i" (HWEX_MSR_BIT)                    \
  60                                 : "memory", "r12")
  61 #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
  62
  63 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
  64                                                         int fsr, int addr);
  65
  66 asmlinkage void sw_exception(struct pt_regs *regs);
  67 void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
  68
  69 void die(const char *str, struct pt_regs *fp, long err);
  70 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
  71
  72 #endif /*__ASSEMBLY__ */
  73 #endif /* __KERNEL__ */
  74 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */