253 lines
8.0 KiB
C
253 lines
8.0 KiB
C
/* 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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#ifndef __ASSEMBLY__
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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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* 0x8a0 sve_context (vl <= 64) (optional)
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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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* 0x510 (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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/*
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* Note: similarly to all other integer fields, each V-register is stored in an
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* endianness-dependent format, with the byte at offset i from the start of the
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* in-memory representation of the register value containing
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*
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* bits [(7 + 8 * i) : (8 * i)] of the register on little-endian hosts; or
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* bits [(127 - 8 * i) : (120 - 8 * i)] on big-endian hosts.
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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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#define SVE_MAGIC 0x53564501
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struct sve_context {
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struct _aarch64_ctx head;
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__u16 vl;
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__u16 __reserved[3];
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};
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#endif /* !__ASSEMBLY__ */
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#include <asm/sve_context.h>
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/*
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* The SVE architecture leaves space for future expansion of the
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* vector length beyond its initial architectural limit of 2048 bits
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* (16 quadwords).
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*
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* See linux/Documentation/arm64/sve.rst for a description of the VL/VQ
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* terminology.
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*/
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#define SVE_VQ_BYTES __SVE_VQ_BYTES /* bytes per quadword */
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#define SVE_VQ_MIN __SVE_VQ_MIN
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#define SVE_VQ_MAX __SVE_VQ_MAX
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#define SVE_VL_MIN __SVE_VL_MIN
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#define SVE_VL_MAX __SVE_VL_MAX
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#define SVE_NUM_ZREGS __SVE_NUM_ZREGS
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#define SVE_NUM_PREGS __SVE_NUM_PREGS
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#define sve_vl_valid(vl) __sve_vl_valid(vl)
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#define sve_vq_from_vl(vl) __sve_vq_from_vl(vl)
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#define sve_vl_from_vq(vq) __sve_vl_from_vq(vq)
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/*
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* If the SVE registers are currently live for the thread at signal delivery,
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* sve_context.head.size >=
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* SVE_SIG_CONTEXT_SIZE(sve_vq_from_vl(sve_context.vl))
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* and the register data may be accessed using the SVE_SIG_*() macros.
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*
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* If sve_context.head.size <
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* SVE_SIG_CONTEXT_SIZE(sve_vq_from_vl(sve_context.vl)),
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* the SVE registers were not live for the thread and no register data
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* is included: in this case, the SVE_SIG_*() macros should not be
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* used except for this check.
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*
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* The same convention applies when returning from a signal: a caller
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* will need to remove or resize the sve_context block if it wants to
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* make the SVE registers live when they were previously non-live or
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* vice-versa. This may require the caller to allocate fresh
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* memory and/or move other context blocks in the signal frame.
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*
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* Changing the vector length during signal return is not permitted:
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* sve_context.vl must equal the thread's current vector length when
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* doing a sigreturn.
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*
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*
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* Note: for all these macros, the "vq" argument denotes the SVE
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* vector length in quadwords (i.e., units of 128 bits).
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*
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* The correct way to obtain vq is to use sve_vq_from_vl(vl). The
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* result is valid if and only if sve_vl_valid(vl) is true. This is
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* guaranteed for a struct sve_context written by the kernel.
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*
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*
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* Additional macros describe the contents and layout of the payload.
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* For each, SVE_SIG_x_OFFSET(args) is the start offset relative to
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* the start of struct sve_context, and SVE_SIG_x_SIZE(args) is the
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* size in bytes:
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*
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* x type description
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* - ---- -----------
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* REGS the entire SVE context
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*
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* ZREGS __uint128_t[SVE_NUM_ZREGS][vq] all Z-registers
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* ZREG __uint128_t[vq] individual Z-register Zn
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*
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* PREGS uint16_t[SVE_NUM_PREGS][vq] all P-registers
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* PREG uint16_t[vq] individual P-register Pn
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*
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* FFR uint16_t[vq] first-fault status register
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*
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* Additional data might be appended in the future.
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*
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* Unlike vregs[] in fpsimd_context, each SVE scalable register (Z-, P- or FFR)
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* is encoded in memory in an endianness-invariant format, with the byte at
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* offset i from the start of the in-memory representation containing bits
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* [(7 + 8 * i) : (8 * i)] of the register value.
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*/
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#define SVE_SIG_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq)
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#define SVE_SIG_PREG_SIZE(vq) __SVE_PREG_SIZE(vq)
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#define SVE_SIG_FFR_SIZE(vq) __SVE_FFR_SIZE(vq)
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#define SVE_SIG_REGS_OFFSET \
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((sizeof(struct sve_context) + (__SVE_VQ_BYTES - 1)) \
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/ __SVE_VQ_BYTES * __SVE_VQ_BYTES)
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#define SVE_SIG_ZREGS_OFFSET \
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(SVE_SIG_REGS_OFFSET + __SVE_ZREGS_OFFSET)
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#define SVE_SIG_ZREG_OFFSET(vq, n) \
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(SVE_SIG_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n))
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#define SVE_SIG_ZREGS_SIZE(vq) __SVE_ZREGS_SIZE(vq)
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#define SVE_SIG_PREGS_OFFSET(vq) \
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(SVE_SIG_REGS_OFFSET + __SVE_PREGS_OFFSET(vq))
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#define SVE_SIG_PREG_OFFSET(vq, n) \
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(SVE_SIG_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n))
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#define SVE_SIG_PREGS_SIZE(vq) __SVE_PREGS_SIZE(vq)
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#define SVE_SIG_FFR_OFFSET(vq) \
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(SVE_SIG_REGS_OFFSET + __SVE_FFR_OFFSET(vq))
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#define SVE_SIG_REGS_SIZE(vq) \
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(__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq))
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#define SVE_SIG_CONTEXT_SIZE(vq) \
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(SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
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#endif /* _UAPI__ASM_SIGCONTEXT_H */
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