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