| /* 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]; |
| }; |
| |
| /* 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 /* _UAPI__ASM_SIGCONTEXT_H */ |