1 /* 2 * Based on arch/arm/include/asm/traps.h 3 * 4 * Copyright (C) 2012 ARM Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 #ifndef __ASM_TRAP_H 19 #define __ASM_TRAP_H 20 21 #include <linux/list.h> 22 #include <asm/esr.h> 23 #include <asm/sections.h> 24 25 struct pt_regs; 26 27 struct undef_hook { 28 struct list_head node; 29 u32 instr_mask; 30 u32 instr_val; 31 u64 pstate_mask; 32 u64 pstate_val; 33 int (*fn)(struct pt_regs *regs, u32 instr); 34 }; 35 36 void register_undef_hook(struct undef_hook *hook); 37 void unregister_undef_hook(struct undef_hook *hook); 38 void force_signal_inject(int signal, int code, struct pt_regs *regs, 39 unsigned long address); 40 41 void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr); 42 43 /* 44 * Move regs->pc to next instruction and do necessary setup before it 45 * is executed. 46 */ 47 void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size); 48 49 static inline int __in_irqentry_text(unsigned long ptr) 50 { 51 return ptr >= (unsigned long)&__irqentry_text_start && 52 ptr < (unsigned long)&__irqentry_text_end; 53 } 54 55 static inline int in_exception_text(unsigned long ptr) 56 { 57 int in; 58 59 in = ptr >= (unsigned long)&__exception_text_start && 60 ptr < (unsigned long)&__exception_text_end; 61 62 return in ? : __in_irqentry_text(ptr); 63 } 64 65 static inline int in_entry_text(unsigned long ptr) 66 { 67 return ptr >= (unsigned long)&__entry_text_start && 68 ptr < (unsigned long)&__entry_text_end; 69 } 70 71 /* 72 * CPUs with the RAS extensions have an Implementation-Defined-Syndrome bit 73 * to indicate whether this ESR has a RAS encoding. CPUs without this feature 74 * have a ISS-Valid bit in the same position. 75 * If this bit is set, we know its not a RAS SError. 76 * If its clear, we need to know if the CPU supports RAS. Uncategorized RAS 77 * errors share the same encoding as an all-zeros encoding from a CPU that 78 * doesn't support RAS. 79 */ 80 static inline bool arm64_is_ras_serror(u32 esr) 81 { 82 WARN_ON(preemptible()); 83 84 if (esr & ESR_ELx_IDS) 85 return false; 86 87 if (this_cpu_has_cap(ARM64_HAS_RAS_EXTN)) 88 return true; 89 else 90 return false; 91 } 92 93 /* 94 * Return the AET bits from a RAS SError's ESR. 95 * 96 * It is implementation defined whether Uncategorized errors are containable. 97 * We treat them as Uncontainable. 98 * Non-RAS SError's are reported as Uncontained/Uncategorized. 99 */ 100 static inline u32 arm64_ras_serror_get_severity(u32 esr) 101 { 102 u32 aet = esr & ESR_ELx_AET; 103 104 if (!arm64_is_ras_serror(esr)) { 105 /* Not a RAS error, we can't interpret the ESR. */ 106 return ESR_ELx_AET_UC; 107 } 108 109 /* 110 * AET is RES0 if 'the value returned in the DFSC field is not 111 * [ESR_ELx_FSC_SERROR]' 112 */ 113 if ((esr & ESR_ELx_FSC) != ESR_ELx_FSC_SERROR) { 114 /* No severity information : Uncategorized */ 115 return ESR_ELx_AET_UC; 116 } 117 118 return aet; 119 } 120 121 bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr); 122 void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr); 123 #endif 124