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9966a05c7b
Currently, <uapi/asm/sigcontext.h> provides common definitions for describing SVE context structures that are also used by the ptrace definitions in <uapi/asm/ptrace.h>. For this reason, a #include of <asm/sigcontext.h> was added in ptrace.h, but it this turns out that this can interact badly with userspace code that tries to include ptrace.h on top of the libc headers (which may provide their own shadow definitions for sigcontext.h). To make the headers easier for userspace to consume, this patch bounces the common definitions into an __SVE_* namespace and moves them to a backend header <uapi/asm/sve_context.h> that can be included by the other headers as appropriate. This should allow ptrace.h to be used alongside libc's sigcontext.h (if any) without ill effects. This should make the situation unambiguous: <asm/sigcontext.h> is the header to include for the sigframe-specific definitions, while <asm/ptrace.h> is the header to include for ptrace-specific definitions. To avoid conflicting with existing usage, <asm/sigcontext.h> remains the canonical way to get the common definitions for SVE_VQ_MIN, sve_vq_from_vl() etc., both in userspace and in the kernel: relying on these being defined as a side effect of including just <asm/ptrace.h> was never intended to be safe. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/* Copyright (C) 2017-2018 ARM Limited */
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/*
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* For use by other UAPI headers only.
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* Do not make direct use of header or its definitions.
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*/
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#ifndef _UAPI__ASM_SVE_CONTEXT_H
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#define _UAPI__ASM_SVE_CONTEXT_H
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#include <linux/types.h>
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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 && \
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(vl) >= __SVE_VL_MIN && \
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(vl) <= __SVE_VL_MAX)
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#define __sve_vq_from_vl(vl) ((vl) / __SVE_VQ_BYTES)
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#define __sve_vl_from_vq(vq) ((vq) * __SVE_VQ_BYTES)
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#define __SVE_ZREG_SIZE(vq) ((__u32)(vq) * __SVE_VQ_BYTES)
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#define __SVE_PREG_SIZE(vq) ((__u32)(vq) * (__SVE_VQ_BYTES / 8))
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#define __SVE_FFR_SIZE(vq) __SVE_PREG_SIZE(vq)
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#define __SVE_ZREGS_OFFSET 0
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#define __SVE_ZREG_OFFSET(vq, n) \
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(__SVE_ZREGS_OFFSET + __SVE_ZREG_SIZE(vq) * (n))
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#define __SVE_ZREGS_SIZE(vq) \
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(__SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - __SVE_ZREGS_OFFSET)
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#define __SVE_PREGS_OFFSET(vq) \
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(__SVE_ZREGS_OFFSET + __SVE_ZREGS_SIZE(vq))
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#define __SVE_PREG_OFFSET(vq, n) \
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(__SVE_PREGS_OFFSET(vq) + __SVE_PREG_SIZE(vq) * (n))
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#define __SVE_PREGS_SIZE(vq) \
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(__SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - __SVE_PREGS_OFFSET(vq))
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#define __SVE_FFR_OFFSET(vq) \
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(__SVE_PREGS_OFFSET(vq) + __SVE_PREGS_SIZE(vq))
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#endif /* ! _UAPI__ASM_SVE_CONTEXT_H */
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