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| 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 __ASSEMBLER__ |
| 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 /* __ASSEMBLER__ */ |
| 174 | /* Prototype for function defined in exceptions-64s.S */ |
| 175 | void do_uaccess_flush(void); |
| 176 | #endif /* __ASSEMBLER__ */ |
| 177 | |
| 178 | #endif /* _ASM_POWERPC_EXCEPTION_H */ |
| 179 |
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