LXR linux/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
  58asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
  59                                                        int fsr, int addr);
  60
  61asmlinkage void sw_exception(struct pt_regs *regs);
  62void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
  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#endif /*__ASSEMBLY__ */
  68#endif /* __KERNEL__ */
  69#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
  70