1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * Copyright (C) 2012 ARM Ltd.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #ifndef _UAPI__ASM_SIGCONTEXT_H
18 #define _UAPI__ASM_SIGCONTEXT_H
20 #include <linux/types.h>
23 * Signal context structure - contains all info to do with the state
24 * before the signal handler was invoked.
28 /* AArch64 registers */
33 /* 4K reserved for FP/SIMD state and future expansion */
34 __u8 __reserved[4096] __attribute__((__aligned__(16)));
38 * Allocation of __reserved[]:
39 * (Note: records do not necessarily occur in the order shown here.)
43 * 0x210 fpsimd_context
45 * 0x20 extra_context (optional)
46 * 0x10 terminator (null _aarch64_ctx)
48 * 0xdb0 (reserved for future allocation)
50 * New records that can exceed this space need to be opt-in for userspace, so
51 * that an expanded signal frame is not generated unexpectedly. The mechanism
52 * for opting in will depend on the extension that generates each new record.
53 * The above table documents the maximum set and sizes of records than can be
54 * generated when userspace does not opt in for any such extension.
58 * Header to be used at the beginning of structures extending the user
59 * context. Such structures must be placed after the rt_sigframe on the stack
60 * and be 16-byte aligned. The last structure must be a dummy one with the
61 * magic and size set to 0.
68 #define FPSIMD_MAGIC 0x46508001
70 struct fpsimd_context {
71 struct _aarch64_ctx head;
74 __uint128_t vregs[32];
78 #define ESR_MAGIC 0x45535201
81 struct _aarch64_ctx head;
86 * extra_context: describes extra space in the signal frame for
87 * additional structures that don't fit in sigcontext.__reserved[].
91 * 1) fpsimd_context, esr_context and extra_context must be placed in
92 * sigcontext.__reserved[] if present. They cannot be placed in the
93 * extra space. Any other record can be placed either in the extra
94 * space or in sigcontext.__reserved[], unless otherwise specified in
97 * 2) There must not be more than one extra_context.
99 * 3) If extra_context is present, it must be followed immediately in
100 * sigcontext.__reserved[] by the terminating null _aarch64_ctx.
102 * 4) The extra space to which datap points must start at the first
103 * 16-byte aligned address immediately after the terminating null
104 * _aarch64_ctx that follows the extra_context structure in
105 * __reserved[]. The extra space may overrun the end of __reserved[],
106 * as indicated by a sufficiently large value for the size field.
108 * 5) The extra space must itself be terminated with a null
111 #define EXTRA_MAGIC 0x45585401
113 struct extra_context {
114 struct _aarch64_ctx head;
115 __u64 datap; /* 16-byte aligned pointer to extra space cast to __u64 */
116 __u32 size; /* size in bytes of the extra space */
120 #endif /* _UAPI__ASM_SIGCONTEXT_H */