304 lines
10 KiB
C
304 lines
10 KiB
C
/* 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 _UAPI__ASM_SIGCONTEXT_H
|
|
#define _UAPI__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];
|
|
};
|
|
|
|
/*
|
|
* Note: similarly to all other integer fields, each V-register is stored in an
|
|
* endianness-dependent format, with the byte at offset i from the start of the
|
|
* in-memory representation of the register value containing
|
|
*
|
|
* bits [(7 + 8 * i) : (8 * i)] of the register on little-endian hosts; or
|
|
* bits [(127 - 8 * i) : (120 - 8 * i)] on big-endian hosts.
|
|
*/
|
|
|
|
/* 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 flags;
|
|
__u16 __reserved[2];
|
|
};
|
|
|
|
#define SVE_SIG_FLAG_SM 0x1 /* Context describes streaming mode */
|
|
|
|
#define ZA_MAGIC 0x54366345
|
|
|
|
struct za_context {
|
|
struct _aarch64_ctx head;
|
|
__u16 vl;
|
|
__u16 __reserved[3];
|
|
};
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#include <asm/sve_context.h>
|
|
|
|
/*
|
|
* 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.rst for a description of the VL/VQ
|
|
* terminology.
|
|
*/
|
|
#define SVE_VQ_BYTES __SVE_VQ_BYTES /* bytes per quadword */
|
|
|
|
#define SVE_VQ_MIN __SVE_VQ_MIN
|
|
#define SVE_VQ_MAX __SVE_VQ_MAX
|
|
|
|
#define SVE_VL_MIN __SVE_VL_MIN
|
|
#define SVE_VL_MAX __SVE_VL_MAX
|
|
|
|
#define SVE_NUM_ZREGS __SVE_NUM_ZREGS
|
|
#define SVE_NUM_PREGS __SVE_NUM_PREGS
|
|
|
|
#define sve_vl_valid(vl) __sve_vl_valid(vl)
|
|
#define sve_vq_from_vl(vl) __sve_vq_from_vl(vl)
|
|
#define sve_vl_from_vq(vq) __sve_vl_from_vq(vq)
|
|
|
|
/*
|
|
* 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 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.
|
|
*
|
|
* On systems with support for SME the SVE register state may reflect either
|
|
* streaming or non-streaming mode. In streaming mode the streaming mode
|
|
* vector length will be used and the flag SVE_SIG_FLAG_SM will be set in
|
|
* the flags field. It is permitted to enter or leave streaming mode in
|
|
* a signal return, applications should take care to ensure that any difference
|
|
* in vector length between the two modes is handled, including any resizing
|
|
* and movement of context blocks.
|
|
*
|
|
* Note: for all these macros, the "vq" argument denotes the 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.
|
|
*
|
|
* Unlike vregs[] in fpsimd_context, each SVE scalable register (Z-, P- or FFR)
|
|
* is encoded in memory in an endianness-invariant format, with the byte at
|
|
* offset i from the start of the in-memory representation containing bits
|
|
* [(7 + 8 * i) : (8 * i)] of the register value.
|
|
*/
|
|
|
|
#define SVE_SIG_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq)
|
|
#define SVE_SIG_PREG_SIZE(vq) __SVE_PREG_SIZE(vq)
|
|
#define SVE_SIG_FFR_SIZE(vq) __SVE_FFR_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 + __SVE_ZREGS_OFFSET)
|
|
#define SVE_SIG_ZREG_OFFSET(vq, n) \
|
|
(SVE_SIG_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n))
|
|
#define SVE_SIG_ZREGS_SIZE(vq) __SVE_ZREGS_SIZE(vq)
|
|
|
|
#define SVE_SIG_PREGS_OFFSET(vq) \
|
|
(SVE_SIG_REGS_OFFSET + __SVE_PREGS_OFFSET(vq))
|
|
#define SVE_SIG_PREG_OFFSET(vq, n) \
|
|
(SVE_SIG_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n))
|
|
#define SVE_SIG_PREGS_SIZE(vq) __SVE_PREGS_SIZE(vq)
|
|
|
|
#define SVE_SIG_FFR_OFFSET(vq) \
|
|
(SVE_SIG_REGS_OFFSET + __SVE_FFR_OFFSET(vq))
|
|
|
|
#define SVE_SIG_REGS_SIZE(vq) \
|
|
(__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq))
|
|
|
|
#define SVE_SIG_CONTEXT_SIZE(vq) \
|
|
(SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
|
|
|
|
/*
|
|
* If the ZA register is enabled for the thread at signal delivery then,
|
|
* za_context.head.size >= ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(za_context.vl))
|
|
* and the register data may be accessed using the ZA_SIG_*() macros.
|
|
*
|
|
* If za_context.head.size < ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(za_context.vl))
|
|
* then ZA was not enabled and no register data was included in which case
|
|
* ZA register was not enabled for the thread and no register data
|
|
* the ZA_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 za_context block if it wants to
|
|
* enable the ZA register when it was previously non-live or vice-versa.
|
|
* This may require 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:
|
|
* za_context.vl must equal the thread's current SME vector length when
|
|
* doing a sigreturn.
|
|
*/
|
|
|
|
#define ZA_SIG_REGS_OFFSET \
|
|
((sizeof(struct za_context) + (__SVE_VQ_BYTES - 1)) \
|
|
/ __SVE_VQ_BYTES * __SVE_VQ_BYTES)
|
|
|
|
#define ZA_SIG_REGS_SIZE(vq) ((vq * __SVE_VQ_BYTES) * (vq * __SVE_VQ_BYTES))
|
|
|
|
#define ZA_SIG_ZAV_OFFSET(vq, n) (ZA_SIG_REGS_OFFSET + \
|
|
(SVE_SIG_ZREG_SIZE(vq) * n))
|
|
|
|
#define ZA_SIG_CONTEXT_SIZE(vq) \
|
|
(ZA_SIG_REGS_OFFSET + ZA_SIG_REGS_SIZE(vq))
|
|
|
|
#endif /* _UAPI__ASM_SIGCONTEXT_H */
|