59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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/* Common target dependent for AArch64 systems.
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Copyright (C) 2018 Free Software Foundation, Inc.
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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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#include <sys/utsname.h>
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#include <sys/uio.h>
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#include "common-defs.h"
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#include "elf/external.h"
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#include "elf/common.h"
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#include "aarch64-sve-linux-ptrace.h"
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#include "arch/aarch64.h"
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/* See nat/aarch64-sve-linux-ptrace.h. */
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unsigned long
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aarch64_sve_get_vq (int tid)
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{
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struct iovec iovec;
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struct user_sve_header header;
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iovec.iov_len = sizeof (header);
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iovec.iov_base = &header;
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/* Ptrace gives the vector length in bytes. Convert it to VQ, the number of
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128bit chunks in a Z register. We use VQ because 128bits is the minimum
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a Z register can increase in size. */
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if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_SVE, &iovec) < 0)
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{
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/* SVE is not supported. */
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return 0;
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}
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long vq = sve_vq_from_vl (header.vl);
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if (!sve_vl_valid (header.vl))
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{
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warning (_("Invalid SVE state from kernel; SVE disabled."));
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return 0;
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}
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return vq;
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}
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