1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2#ifndef _ASM_POWERPC_EXCEPTION_H 3#define _ASM_POWERPC_EXCEPTION_H 4/* 5 * Extracted from head_64.S 6 * 7 * PowerPC version 8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 9 * 10 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 11 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 12 * Adapted for Power Macintosh by Paul Mackerras. 13 * Low-level exception handlers and MMU support 14 * rewritten by Paul Mackerras. 15 * Copyright (C) 1996 Paul Mackerras. 16 * 17 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and 18 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com 19 * 20 * This file contains the low-level support and setup for the 21 * PowerPC-64 platform, including trap and interrupt dispatch. 22 */ 23/* 24 * The following macros define the code that appears as 25 * the prologue to each of the exception handlers. They 26 * are split into two parts to allow a single kernel binary 27 * to be used for pSeries and iSeries. 28 * 29 * We make as much of the exception code common between native 30 * exception handlers (including pSeries LPAR) and iSeries LPAR 31 * implementations as possible. 32 */ 33#include <asm/feature-fixups.h> 34 35/* PACA save area size in u64 units (exgen, exmc, etc) */ 36#define EX_SIZE 10 37 38/* PACA save area offsets */ 39#define EX_R9 0 40#define EX_R10 8 41#define EX_R11 16 42#define EX_R12 24 43#define EX_R13 32 44#define EX_DAR 40 45#define EX_DSISR 48 46#define EX_CCR 52 47#define EX_CFAR 56 48#define EX_PPR 64 49#define EX_CTR 72 50 51/* 52 * maximum recursive depth of MCE exceptions 53 */ 54#define MAX_MCE_DEPTH 4 55 56#ifdef __ASSEMBLY__ 57 58#define STF_ENTRY_BARRIER_SLOT \ 59 STF_ENTRY_BARRIER_FIXUP_SECTION; \ 60 nop; \ 61 nop; \ 62 nop 63 64#define STF_EXIT_BARRIER_SLOT \ 65 STF_EXIT_BARRIER_FIXUP_SECTION; \ 66 nop; \ 67 nop; \ 68 nop; \ 69 nop; \ 70 nop; \ 71 nop 72 73#define ENTRY_FLUSH_SLOT \ 74 ENTRY_FLUSH_FIXUP_SECTION; \ 75 nop; \ 76 nop; \ 77 nop; 78 79#define SCV_ENTRY_FLUSH_SLOT \ 80 SCV_ENTRY_FLUSH_FIXUP_SECTION; \ 81 nop; \ 82 nop; \ 83 nop; 84 85/* 86 * r10 must be free to use, r13 must be paca 87 */ 88#define INTERRUPT_TO_KERNEL \ 89 STF_ENTRY_BARRIER_SLOT; \ 90 ENTRY_FLUSH_SLOT 91 92/* 93 * r10, ctr must be free to use, r13 must be paca 94 */ 95#define SCV_INTERRUPT_TO_KERNEL \ 96 STF_ENTRY_BARRIER_SLOT; \ 97 SCV_ENTRY_FLUSH_SLOT 98 99/* 100 * Macros for annotating the expected destination of (h)rfid 101 * 102 * The nop instructions allow us to insert one or more instructions to flush the 103 * L1-D cache when returning to userspace or a guest. 104 * 105 * powerpc relies on return from interrupt/syscall being context synchronising 106 * (which hrfid, rfid, and rfscv are) to support ARCH_HAS_MEMBARRIER_SYNC_CORE 107 * without additional synchronisation instructions. 108 * 109 * soft-masked interrupt replay does not include a context-synchronising rfid, 110 * but those always return to kernel, the sync is only required when returning 111 * to user. 112 */ 113#define RFI_FLUSH_SLOT \ 114 RFI_FLUSH_FIXUP_SECTION; \ 115 nop; \ 116 nop; \ 117 nop 118 119#define RFI_TO_KERNEL \ 120 rfid 121 122#define RFI_TO_USER \ 123 STF_EXIT_BARRIER_SLOT; \ 124 RFI_FLUSH_SLOT; \ 125 rfid; \ 126 b rfi_flush_fallback 127 128#define RFI_TO_USER_OR_KERNEL \ 129 STF_EXIT_BARRIER_SLOT; \ 130 RFI_FLUSH_SLOT; \ 131 rfid; \ 132 b rfi_flush_fallback 133 134#define RFI_TO_GUEST \ 135 STF_EXIT_BARRIER_SLOT; \ 136 RFI_FLUSH_SLOT; \ 137 rfid; \ 138 b rfi_flush_fallback 139 140#define HRFI_TO_KERNEL \ 141 hrfid 142 143#define HRFI_TO_USER \ 144 STF_EXIT_BARRIER_SLOT; \ 145 RFI_FLUSH_SLOT; \ 146 hrfid; \ 147 b hrfi_flush_fallback 148 149#define HRFI_TO_USER_OR_KERNEL \ 150 STF_EXIT_BARRIER_SLOT; \ 151 RFI_FLUSH_SLOT; \ 152 hrfid; \ 153 b hrfi_flush_fallback 154 155#define HRFI_TO_GUEST \ 156 STF_EXIT_BARRIER_SLOT; \ 157 RFI_FLUSH_SLOT; \ 158 hrfid; \ 159 b hrfi_flush_fallback 160 161#define HRFI_TO_UNKNOWN \ 162 STF_EXIT_BARRIER_SLOT; \ 163 RFI_FLUSH_SLOT; \ 164 hrfid; \ 165 b hrfi_flush_fallback 166 167#define RFSCV_TO_USER \ 168 STF_EXIT_BARRIER_SLOT; \ 169 RFI_FLUSH_SLOT; \ 170 RFSCV; \ 171 b rfscv_flush_fallback 172 173#else /* __ASSEMBLY__ */ 174/* Prototype for function defined in exceptions-64s.S */ 175void do_uaccess_flush(void); 176#endif /* __ASSEMBLY__ */ 177 178#endif /* _ASM_POWERPC_EXCEPTION_H */ 179