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 */
175 void do_uaccess_flush(void);
176 #endif /* __ASSEMBLY__ */
177
178 #endif /* _ASM_POWERPC_EXCEPTION_H */
179
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