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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
* Copyright (C) 2012 ARM Ltd.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <>.
#include <linux/types.h>
* Signal context structure - contains all info to do with the state
* before the signal handler was invoked.
struct sigcontext {
__u64 fault_address;
/* AArch64 registers */
__u64 regs[31];
__u64 sp;
__u64 pc;
__u64 pstate;
/* 4K reserved for FP/SIMD state and future expansion */
__u8 __reserved[4096] __attribute__((__aligned__(16)));
* Allocation of __reserved[]:
* (Note: records do not necessarily occur in the order shown here.)
* size description
* 0x210 fpsimd_context
* 0x10 esr_context
* 0x20 extra_context (optional)
* 0x10 terminator (null _aarch64_ctx)
* 0xdb0 (reserved for future allocation)
* New records that can exceed this space need to be opt-in for userspace, so
* that an expanded signal frame is not generated unexpectedly. The mechanism
* for opting in will depend on the extension that generates each new record.
* The above table documents the maximum set and sizes of records than can be
* generated when userspace does not opt in for any such extension.
* Header to be used at the beginning of structures extending the user
* context. Such structures must be placed after the rt_sigframe on the stack
* and be 16-byte aligned. The last structure must be a dummy one with the
* magic and size set to 0.
struct _aarch64_ctx {
__u32 magic;
__u32 size;
#define FPSIMD_MAGIC 0x46508001
struct fpsimd_context {
struct _aarch64_ctx head;
__u32 fpsr;
__u32 fpcr;
__uint128_t vregs[32];
/* ESR_EL1 context */
#define ESR_MAGIC 0x45535201
struct esr_context {
struct _aarch64_ctx head;
__u64 esr;
* extra_context: describes extra space in the signal frame for
* additional structures that don't fit in sigcontext.__reserved[].
* Note:
* 1) fpsimd_context, esr_context and extra_context must be placed in
* sigcontext.__reserved[] if present. They cannot be placed in the
* extra space. Any other record can be placed either in the extra
* space or in sigcontext.__reserved[], unless otherwise specified in
* this file.
* 2) There must not be more than one extra_context.
* 3) If extra_context is present, it must be followed immediately in
* sigcontext.__reserved[] by the terminating null _aarch64_ctx.
* 4) The extra space to which datap points must start at the first
* 16-byte aligned address immediately after the terminating null
* _aarch64_ctx that follows the extra_context structure in
* __reserved[]. The extra space may overrun the end of __reserved[],
* as indicated by a sufficiently large value for the size field.
* 5) The extra space must itself be terminated with a null
* _aarch64_ctx.
#define EXTRA_MAGIC 0x45585401
struct extra_context {
struct _aarch64_ctx head;
__u64 datap; /* 16-byte aligned pointer to extra space cast to __u64 */
__u32 size; /* size in bytes of the extra space */
__u32 __reserved[3];
#endif /* _UAPI__ASM_SIGCONTEXT_H */