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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
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * 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 <http://www.gnu.org/licenses/>.
- */
- #ifndef __ASM_SIGCONTEXT_H
- #define __ASM_SIGCONTEXT_H
- #ifndef __ASSEMBLY__
- #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
- * 0x8a0 sve_context (vl <= 64) (optional)
- * 0x20 extra_context (optional)
- * 0x10 terminator (null _aarch64_ctx)
- *
- * 0x510 (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];
- };
- #define SVE_MAGIC 0x53564501
- struct sve_context {
- struct _aarch64_ctx head;
- __u16 vl;
- __u16 __reserved[3];
- };
- #endif /* !__ASSEMBLY__ */
- /*
- * The SVE architecture leaves space for future expansion of the
- * vector length beyond its initial architectural limit of 2048 bits
- * (16 quadwords).
- *
- * See linux/Documentation/arm64/sve.txt for a description of the VL/VQ
- * terminology.
- */
- #define SVE_VQ_BYTES 16 /* number of bytes per quadword */
- #define SVE_VQ_MIN 1
- #define SVE_VQ_MAX 512
- #define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES)
- #define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES)
- #define SVE_NUM_ZREGS 32
- #define SVE_NUM_PREGS 16
- #define sve_vl_valid(vl) \
- ((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
- #define sve_vq_from_vl(vl) ((vl) / SVE_VQ_BYTES)
- #define sve_vl_from_vq(vq) ((vq) * SVE_VQ_BYTES)
- /*
- * If the SVE registers are currently live for the thread at signal delivery,
- * sve_context.head.size >=
- * SVE_SIG_CONTEXT_SIZE(sve_vq_from_vl(sve_context.vl))
- * and the register data may be accessed using the SVE_SIG_*() macros.
- *
- * If sve_context.head.size <
- * SVE_SIG_CONTEXT_SIZE(sve_vq_from_vl(sve_context.vl)),
- * the SVE registers were not live for the thread and no register data
- * is included: in this case, the SVE_SIG_*() macros should not be
- * used except for this check.
- *
- * The same convention applies when returning from a signal: a caller
- * will need to remove or resize the sve_context block if it wants to
- * make the SVE registers live when they were previously non-live or
- * vice-versa. This may require the the caller to allocate fresh
- * memory and/or move other context blocks in the signal frame.
- *
- * Changing the vector length during signal return is not permitted:
- * sve_context.vl must equal the thread's current vector length when
- * doing a sigreturn.
- *
- *
- * Note: for all these macros, the "vq" argument denotes the SVE
- * vector length in quadwords (i.e., units of 128 bits).
- *
- * The correct way to obtain vq is to use sve_vq_from_vl(vl). The
- * result is valid if and only if sve_vl_valid(vl) is true. This is
- * guaranteed for a struct sve_context written by the kernel.
- *
- *
- * Additional macros describe the contents and layout of the payload.
- * For each, SVE_SIG_x_OFFSET(args) is the start offset relative to
- * the start of struct sve_context, and SVE_SIG_x_SIZE(args) is the
- * size in bytes:
- *
- * x type description
- * - ---- -----------
- * REGS the entire SVE context
- *
- * ZREGS __uint128_t[SVE_NUM_ZREGS][vq] all Z-registers
- * ZREG __uint128_t[vq] individual Z-register Zn
- *
- * PREGS uint16_t[SVE_NUM_PREGS][vq] all P-registers
- * PREG uint16_t[vq] individual P-register Pn
- *
- * FFR uint16_t[vq] first-fault status register
- *
- * Additional data might be appended in the future.
- */
- #define SVE_SIG_ZREG_SIZE(vq) ((__u32)(vq) * SVE_VQ_BYTES)
- #define SVE_SIG_PREG_SIZE(vq) ((__u32)(vq) * (SVE_VQ_BYTES / 8))
- #define SVE_SIG_FFR_SIZE(vq) SVE_SIG_PREG_SIZE(vq)
- #define SVE_SIG_REGS_OFFSET \
- ((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1)) \
- / SVE_VQ_BYTES * SVE_VQ_BYTES)
- #define SVE_SIG_ZREGS_OFFSET SVE_SIG_REGS_OFFSET
- #define SVE_SIG_ZREG_OFFSET(vq, n) \
- (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n))
- #define SVE_SIG_ZREGS_SIZE(vq) \
- (SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET)
- #define SVE_SIG_PREGS_OFFSET(vq) \
- (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq))
- #define SVE_SIG_PREG_OFFSET(vq, n) \
- (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n))
- #define SVE_SIG_PREGS_SIZE(vq) \
- (SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq))
- #define SVE_SIG_FFR_OFFSET(vq) \
- (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq))
- #define SVE_SIG_REGS_SIZE(vq) \
- (SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET)
- #define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
- #endif /* __ASM_SIGCONTEXT_H */
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