arch/arm64/include/asm/traps.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Based on arch/arm/include/asm/traps.h
   4  *
   5  * Copyright (C) 2012 ARM Ltd.
   6  */
   7 #ifndef __ASM_TRAP_H
   8 #define __ASM_TRAP_H
   9
  10 #include <linux/list.h>
  11 #include <asm/esr.h>
  12 #include <asm/sections.h>
  13
  14 struct pt_regs;
  15
  16 struct undef_hook {
  17         struct list_head node;
  18         u32 instr_mask;
  19         u32 instr_val;
  20         u64 pstate_mask;
  21         u64 pstate_val;
  22         int (*fn)(struct pt_regs *regs, u32 instr);
  23 };
  24
  25 void register_undef_hook(struct undef_hook *hook);
  26 void unregister_undef_hook(struct undef_hook *hook);
  27 void force_signal_inject(int signal, int code, unsigned long address);
  28 void arm64_notify_segfault(unsigned long addr);
  29 void arm64_force_sig_fault(int signo, int code, void __user *addr, const char *str);
  30 void arm64_force_sig_mceerr(int code, void __user *addr, short lsb, const char *str);
  31 void arm64_force_sig_ptrace_errno_trap(int errno, void __user *addr, const char *str);
  32
  33 /*
  34  * Move regs->pc to next instruction and do necessary setup before it
  35  * is executed.
  36  */
  37 void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size);
  38
  39 static inline int __in_irqentry_text(unsigned long ptr)
  40 {
  41         return ptr >= (unsigned long)&__irqentry_text_start &&
  42                ptr < (unsigned long)&__irqentry_text_end;
  43 }
  44
  45 static inline int in_entry_text(unsigned long ptr)
  46 {
  47         return ptr >= (unsigned long)&__entry_text_start &&
  48                ptr < (unsigned long)&__entry_text_end;
  49 }
  50
  51 /*
  52  * CPUs with the RAS extensions have an Implementation-Defined-Syndrome bit
  53  * to indicate whether this ESR has a RAS encoding. CPUs without this feature
  54  * have a ISS-Valid bit in the same position.
  55  * If this bit is set, we know its not a RAS SError.
  56  * If its clear, we need to know if the CPU supports RAS. Uncategorized RAS
  57  * errors share the same encoding as an all-zeros encoding from a CPU that
  58  * doesn't support RAS.
  59  */
  60 static inline bool arm64_is_ras_serror(u32 esr)
  61 {
  62         WARN_ON(preemptible());
  63
  64         if (esr & ESR_ELx_IDS)
  65                 return false;
  66
  67         if (this_cpu_has_cap(ARM64_HAS_RAS_EXTN))
  68                 return true;
  69         else
  70                 return false;
  71 }
  72
  73 /*
  74  * Return the AET bits from a RAS SError's ESR.
  75  *
  76  * It is implementation defined whether Uncategorized errors are containable.
  77  * We treat them as Uncontainable.
  78  * Non-RAS SError's are reported as Uncontained/Uncategorized.
  79  */
  80 static inline u32 arm64_ras_serror_get_severity(u32 esr)
  81 {
  82         u32 aet = esr & ESR_ELx_AET;
  83
  84         if (!arm64_is_ras_serror(esr)) {
  85                 /* Not a RAS error, we can't interpret the ESR. */
  86                 return ESR_ELx_AET_UC;
  87         }
  88
  89         /*
  90          * AET is RES0 if 'the value returned in the DFSC field is not
  91          * [ESR_ELx_FSC_SERROR]'
  92          */
  93         if ((esr & ESR_ELx_FSC) != ESR_ELx_FSC_SERROR) {
  94                 /* No severity information : Uncategorized */
  95                 return ESR_ELx_AET_UC;
  96         }
  97
  98         return aet;
  99 }
 100
 101 bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr);
 102 void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr);
 103 #endif