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9885d13b66
Userspace ucontext needs to store GCSPR, it does not have to be compatible with the kernel ucontext. For now we use the linux struct gcs_context layout but only use the gcspr field from it. Similar implementation to the longjmp code, supports switching GCS if the target GCS is capped, and unwinding a continuous GCS to a previous state. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* Copyright (C) 2009-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define SP_ALIGN_SIZE 15
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#define SP_ALIGN_MASK ~15
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/* Size of an X register in bytes. */
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#define SZREG 8
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/* Size of a V register in bytes. */
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#define SZVREG 16
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/* Number of integer parameter passing registers. */
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#define NUMXREGARGS 8
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/* Number of FP parameter passing registers. */
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#define NUMDREGARGS 8
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/* Size of named integer argument in bytes when passed on the
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stack. */
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#define SIZEOF_NAMED_INT 4
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/* Size of an anonymous integer argument in bytes when passed on the
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stack. */
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#define SIZEOF_ANONYMOUS_INT 8
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#define oX21 (oX0 + 21*8)
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#define oFP (oX0 + 29*8)
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#define oLR (oX0 + 30*8)
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/* Use kernel layout for saving GCSPR in ucontext. */
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#define GCS_MAGIC 0x47435300
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#define GCS_CONTEXT_SIZE 32
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#define oGCSPR 8
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