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/* Common target dependent for AArch64 systems.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
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/>. */
#include <sys/utsname.h>
#include <sys/uio.h>
#include "common-defs.h"
#include "elf/external.h"
#include "elf/common.h"
#include "aarch64-sve-linux-ptrace.h"
#include "arch/aarch64.h"
/* See nat/aarch64-sve-linux-ptrace.h. */
uint64_t
aarch64_sve_get_vq (int tid)
{
struct iovec iovec;
struct user_sve_header header;
iovec.iov_len = sizeof (header);
iovec.iov_base = &header;
/* Ptrace gives the vector length in bytes. Convert it to VQ, the number of
128bit chunks in a Z register. We use VQ because 128bits is the minimum
a Z register can increase in size. */
if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_SVE, &iovec) < 0)
{
/* SVE is not supported. */
return 0;
}
long vq = sve_vq_from_vl (header.vl);
if (!sve_vl_valid (header.vl))
{
warning (_("Invalid SVE state from kernel; SVE disabled."));
return 0;
}
return vq;
}
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