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/* This testcase is part of GDB, the GNU debugger.
Copyright 2023-2024 Free Software Foundation, Inc.
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/>. */
/* AArch64 SME feature check. This test serves as a way for the GDB testsuite
to verify that a target supports SVE at runtime, and also reports data
about the various supported SME streaming vector lengths. */
#include <stdio.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef HWCAP2_SME
#define HWCAP2_SME (1 << 23)
#endif
#ifndef PR_SME_SET_VL
#define PR_SME_SET_VL 63
#define PR_SME_GET_VL 64
#define PR_SME_VL_LEN_MASK 0xffff
#endif
static int get_svl_size ()
{
int res = prctl (PR_SME_GET_VL, 0, 0, 0, 0);
if (res < 0)
return -1;
return (res & PR_SME_VL_LEN_MASK);
}
static int set_svl_size (int new_svl)
{
if (prctl (PR_SME_SET_VL, new_svl, 0, 0, 0, 0) < 0)
return -1;
if (get_svl_size () != new_svl)
return -1;
return 0;
}
static void
dummy ()
{
}
#define SVL_MIN 16
#define SVL_MAX 256
#define SVL_INCREMENT_POWER 1
int
main (int argc, char **argv)
{
/* Number of supported SME streaming vector lengths. */
size_t supported_svl_count = 0;
/* Vector containing the various supported SME streaming vector lengths. */
size_t supported_svl[5];
if (getauxval (AT_HWCAP) & HWCAP2_SME)
{
for (int svl = SVL_MIN; svl <= SVL_MAX; svl <<= SVL_INCREMENT_POWER)
{
if (set_svl_size (svl) == 0)
{
supported_svl[supported_svl_count] = svl;
supported_svl_count++;
}
}
}
return 0; /* stop here */
}
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