17a1cc89b5
This header provides compatibility support for SVE allow building even when the underlying host system lacks support for SVE. If the binary is then run on an SVE-enabled kernel then support will automatically be available. gdb/ * nat/aarch64-sve-linux-sigcontext.h: New file. * nat/aarch64-sve-linux-ptrace.h (SVE_VQ_BYTES): Move to new files. (SVE_VQ_MIN): Likewise. (SVE_VQ_MAX): Likewise. (SVE_VL_MIN): Likewise. (SVE_VL_MAX): Likewise. (SVE_NUM_ZREGS): Likewise. (SVE_NUM_PREGS): Likewise. (sve_vl_valid): Likewise. (struct user_sve_header): Likewise.
269 lines
8.7 KiB
C
269 lines
8.7 KiB
C
/* Copyright (C) 2018 Free Software Foundation, Inc.
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Contributed by Arm Ltd.
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This file is part of GDB.
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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 as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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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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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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#ifndef AARCH64_SVE_LINUX_SIGCONTEXT_H
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#define AARCH64_SVE_LINUX_SIGCONTEXT_H
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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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/*
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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.txt for a description of the VL/VQ
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* terminology.
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*/
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#define SVE_VQ_BYTES 16 /* number of bytes per quadword */
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#define SVE_VQ_MIN 1
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#define SVE_VQ_MAX 512
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#define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES)
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#define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES)
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#define SVE_NUM_ZREGS 32
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#define SVE_NUM_PREGS 16
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#define sve_vl_valid(vl) \
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((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
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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 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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#define SVE_SIG_ZREG_SIZE(vq) ((__u32)(vq) * SVE_VQ_BYTES)
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#define SVE_SIG_PREG_SIZE(vq) ((__u32)(vq) * (SVE_VQ_BYTES / 8))
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#define SVE_SIG_FFR_SIZE(vq) SVE_SIG_PREG_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 SVE_SIG_REGS_OFFSET
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#define SVE_SIG_ZREG_OFFSET(vq, n) \
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(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n))
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#define SVE_SIG_ZREGS_SIZE(vq) \
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(SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET)
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#define SVE_SIG_PREGS_OFFSET(vq) \
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(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq))
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#define SVE_SIG_PREG_OFFSET(vq, n) \
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(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n))
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#define SVE_SIG_PREGS_SIZE(vq) \
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(SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq))
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#define SVE_SIG_FFR_OFFSET(vq) \
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(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq))
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#define SVE_SIG_REGS_SIZE(vq) \
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(SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET)
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#define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
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/* SVE/FP/SIMD state (NT_ARM_SVE) */
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struct user_sve_header {
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__u32 size; /* total meaningful regset content in bytes */
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__u32 max_size; /* maxmium possible size for this thread */
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__u16 vl; /* current vector length */
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__u16 max_vl; /* maximum possible vector length */
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__u16 flags;
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__u16 __reserved;
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};
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/* Definitions for user_sve_header.flags: */
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#define SVE_PT_REGS_MASK (1 << 0)
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#define SVE_PT_REGS_FPSIMD 0
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#define SVE_PT_REGS_SVE SVE_PT_REGS_MASK
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/*
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* Common SVE_PT_* flags:
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* These must be kept in sync with prctl interface in <linux/ptrace.h>
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*/
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#define SVE_PT_VL_INHERIT (PR_SVE_VL_INHERIT >> 16)
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#define SVE_PT_VL_ONEXEC (PR_SVE_SET_VL_ONEXEC >> 16)
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/*
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* The remainder of the SVE state follows struct user_sve_header. The
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* total size of the SVE state (including header) depends on the
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* metadata in the header: SVE_PT_SIZE(vq, flags) gives the total size
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* of the state in bytes, including the header.
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*
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* Refer to <asm/sigcontext.h> for details of how to pass the correct
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* "vq" argument to these macros.
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*/
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/* Offset from the start of struct user_sve_header to the register data */
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#define SVE_PT_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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/*
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* The register data content and layout depends on the value of the
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* flags field.
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*/
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/*
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* (flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD case:
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*
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* The payload starts at offset SVE_PT_FPSIMD_OFFSET, and is of type
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* struct user_fpsimd_state. Additional data might be appended in the
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* future: use SVE_PT_FPSIMD_SIZE(vq, flags) to compute the total size.
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* SVE_PT_FPSIMD_SIZE(vq, flags) will never be less than
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* sizeof(struct user_fpsimd_state).
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*/
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#define SVE_PT_FPSIMD_OFFSET SVE_PT_REGS_OFFSET
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#define SVE_PT_FPSIMD_SIZE(vq, flags) (sizeof(struct user_fpsimd_state))
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/*
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* (flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE case:
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*
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* The payload starts at offset SVE_PT_SVE_OFFSET, and is of size
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* SVE_PT_SVE_SIZE(vq, flags).
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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_PT_SVE_x_OFFSET(args) is the start offset relative to
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* the start of struct user_sve_header, and SVE_PT_SVE_x_SIZE(args) is
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* the size in bytes:
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*
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* x type description
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* - ---- -----------
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* ZREGS \
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* ZREG |
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* PREGS | refer to <asm/sigcontext.h>
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* PREG |
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* FFR /
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*
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* FPSR uint32_t FPSR
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* FPCR uint32_t FPCR
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*
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* Additional data might be appended in the future.
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*/
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#define SVE_PT_SVE_ZREG_SIZE(vq) SVE_SIG_ZREG_SIZE(vq)
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#define SVE_PT_SVE_PREG_SIZE(vq) SVE_SIG_PREG_SIZE(vq)
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#define SVE_PT_SVE_FFR_SIZE(vq) SVE_SIG_FFR_SIZE(vq)
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#define SVE_PT_SVE_FPSR_SIZE sizeof(__u32)
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#define SVE_PT_SVE_FPCR_SIZE sizeof(__u32)
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#define __SVE_SIG_TO_PT(offset) \
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((offset) - SVE_SIG_REGS_OFFSET + SVE_PT_REGS_OFFSET)
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#define SVE_PT_SVE_OFFSET SVE_PT_REGS_OFFSET
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#define SVE_PT_SVE_ZREGS_OFFSET \
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__SVE_SIG_TO_PT(SVE_SIG_ZREGS_OFFSET)
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#define SVE_PT_SVE_ZREG_OFFSET(vq, n) \
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__SVE_SIG_TO_PT(SVE_SIG_ZREG_OFFSET(vq, n))
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#define SVE_PT_SVE_ZREGS_SIZE(vq) \
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(SVE_PT_SVE_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET)
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#define SVE_PT_SVE_PREGS_OFFSET(vq) \
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__SVE_SIG_TO_PT(SVE_SIG_PREGS_OFFSET(vq))
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#define SVE_PT_SVE_PREG_OFFSET(vq, n) \
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__SVE_SIG_TO_PT(SVE_SIG_PREG_OFFSET(vq, n))
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#define SVE_PT_SVE_PREGS_SIZE(vq) \
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(SVE_PT_SVE_PREG_OFFSET(vq, SVE_NUM_PREGS) - \
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SVE_PT_SVE_PREGS_OFFSET(vq))
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#define SVE_PT_SVE_FFR_OFFSET(vq) \
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__SVE_SIG_TO_PT(SVE_SIG_FFR_OFFSET(vq))
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#define SVE_PT_SVE_FPSR_OFFSET(vq) \
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((SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq) + \
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(SVE_VQ_BYTES - 1)) \
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/ SVE_VQ_BYTES * SVE_VQ_BYTES)
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#define SVE_PT_SVE_FPCR_OFFSET(vq) \
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(SVE_PT_SVE_FPSR_OFFSET(vq) + SVE_PT_SVE_FPSR_SIZE)
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/*
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* Any future extension appended after FPCR must be aligned to the next
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* 128-bit boundary.
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*/
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#define SVE_PT_SVE_SIZE(vq, flags) \
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((SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE \
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- SVE_PT_SVE_OFFSET + (SVE_VQ_BYTES - 1)) \
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/ SVE_VQ_BYTES * SVE_VQ_BYTES)
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#define SVE_PT_SIZE(vq, flags) \
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(((flags) & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE ? \
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SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, flags) \
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: SVE_PT_FPSIMD_OFFSET + SVE_PT_FPSIMD_SIZE(vq, flags))
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#endif /* AARCH64_SVE_LINUX_SIGCONTEXT_H */
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