GNU Linux-libre 5.4.274-gnu1
[releases.git] / arch / powerpc / include / asm / exception-64s.h
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 #if defined(CONFIG_RELOCATABLE)
37 #define EX_SIZE         10
38 #else
39 #define EX_SIZE         9
40 #endif
41
42 /*
43  * maximum recursive depth of MCE exceptions
44  */
45 #define MAX_MCE_DEPTH   4
46
47 #ifdef __ASSEMBLY__
48
49 #define STF_ENTRY_BARRIER_SLOT                                          \
50         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
51         nop;                                                            \
52         nop;                                                            \
53         nop
54
55 #define STF_EXIT_BARRIER_SLOT                                           \
56         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
57         nop;                                                            \
58         nop;                                                            \
59         nop;                                                            \
60         nop;                                                            \
61         nop;                                                            \
62         nop
63
64 #define ENTRY_FLUSH_SLOT                                                \
65         ENTRY_FLUSH_FIXUP_SECTION;                                      \
66         nop;                                                            \
67         nop;                                                            \
68         nop;
69
70 /*
71  * r10 must be free to use, r13 must be paca
72  */
73 #define INTERRUPT_TO_KERNEL                                             \
74         STF_ENTRY_BARRIER_SLOT;                                         \
75         ENTRY_FLUSH_SLOT
76
77 /*
78  * Macros for annotating the expected destination of (h)rfid
79  *
80  * The nop instructions allow us to insert one or more instructions to flush the
81  * L1-D cache when returning to userspace or a guest.
82  */
83 #define RFI_FLUSH_SLOT                                                  \
84         RFI_FLUSH_FIXUP_SECTION;                                        \
85         nop;                                                            \
86         nop;                                                            \
87         nop
88
89 #define RFI_TO_KERNEL                                                   \
90         rfid
91
92 #define RFI_TO_USER                                                     \
93         STF_EXIT_BARRIER_SLOT;                                          \
94         RFI_FLUSH_SLOT;                                                 \
95         rfid;                                                           \
96         b       rfi_flush_fallback
97
98 #define RFI_TO_USER_OR_KERNEL                                           \
99         STF_EXIT_BARRIER_SLOT;                                          \
100         RFI_FLUSH_SLOT;                                                 \
101         rfid;                                                           \
102         b       rfi_flush_fallback
103
104 #define RFI_TO_GUEST                                                    \
105         STF_EXIT_BARRIER_SLOT;                                          \
106         RFI_FLUSH_SLOT;                                                 \
107         rfid;                                                           \
108         b       rfi_flush_fallback
109
110 #define HRFI_TO_KERNEL                                                  \
111         hrfid
112
113 #define HRFI_TO_USER                                                    \
114         STF_EXIT_BARRIER_SLOT;                                          \
115         RFI_FLUSH_SLOT;                                                 \
116         hrfid;                                                          \
117         b       hrfi_flush_fallback
118
119 #define HRFI_TO_USER_OR_KERNEL                                          \
120         STF_EXIT_BARRIER_SLOT;                                          \
121         RFI_FLUSH_SLOT;                                                 \
122         hrfid;                                                          \
123         b       hrfi_flush_fallback
124
125 #define HRFI_TO_GUEST                                                   \
126         STF_EXIT_BARRIER_SLOT;                                          \
127         RFI_FLUSH_SLOT;                                                 \
128         hrfid;                                                          \
129         b       hrfi_flush_fallback
130
131 #define HRFI_TO_UNKNOWN                                                 \
132         STF_EXIT_BARRIER_SLOT;                                          \
133         RFI_FLUSH_SLOT;                                                 \
134         hrfid;                                                          \
135         b       hrfi_flush_fallback
136
137 #else /* __ASSEMBLY__ */
138 /* Prototype for function defined in exceptions-64s.S */
139 void do_uaccess_flush(void);
140 #endif /* __ASSEMBLY__ */
141
142 #endif  /* _ASM_POWERPC_EXCEPTION_H */