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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/>. */
/* Exercise various cases of reading/writing ZA contents for AArch64's
Scalable Matrix Extension. */
#include <stdio.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef HWCAP_SVE
#define HWCAP_SVE (1 << 22)
#endif
#ifndef HWCAP2_SME
#define HWCAP2_SME (1 << 23)
#endif
#ifndef PR_SVE_SET_VL
#define PR_SVE_SET_VL 50
#define PR_SVE_GET_VL 51
#define PR_SVE_VL_LEN_MASK 0xffff
#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 void
enable_za ()
{
/* smstart za */
__asm __volatile (".word 0xD503457F");
}
static void
disable_za ()
{
/* smstop za */
__asm __volatile (".word 0xD503447F");
}
static int get_vl_size ()
{
int res = prctl (PR_SVE_GET_VL, 0, 0, 0, 0);
if (res < 0)
{
printf ("FAILED to PR_SVE_GET_VL (%d)\n", res);
return -1;
}
return (res & PR_SVE_VL_LEN_MASK);
}
static int get_svl_size ()
{
int res = prctl (PR_SME_GET_VL, 0, 0, 0, 0);
if (res < 0)
{
printf ("FAILED to PR_SME_GET_VL (%d)\n", res);
return -1;
}
return (res & PR_SVE_VL_LEN_MASK);
}
static int set_vl_size (int new_vl)
{
int res = prctl (PR_SVE_SET_VL, new_vl, 0, 0, 0, 0);
if (res < 0)
{
printf ("FAILED to PR_SVE_SET_VL (%d)\n", res);
return -1;
}
res = get_vl_size ();
if (res != new_vl)
{
printf ("Unexpected VL value (%d)\n", res);
return -1;
}
return res;
}
static int set_svl_size (int new_svl)
{
int res = prctl (PR_SME_SET_VL, new_svl, 0, 0, 0, 0);
if (res < 0)
{
printf ("FAILED to PR_SME_SET_VL (%d)\n", res);
return -1;
}
res = get_svl_size ();
if (res != new_svl)
{
printf ("Unexpected SVL value (%d)\n", res);
return -1;
}
return res;
}
static int
test_id_to_vl (int id)
{
return 16 << ((id / 5) % 5);
}
static int
test_id_to_svl (int id)
{
return 16 << (id % 5);
}
static void
dummy ()
{
}
int
main (int argc, char **argv)
{
if (getauxval (AT_HWCAP) & HWCAP_SVE && getauxval (AT_HWCAP2) & HWCAP2_SME)
{
int id_start = ID_START;
int id_end = ID_END;
for (int id = id_start; id <= id_end; id++)
{
int vl = test_id_to_vl (id);
int svl = test_id_to_svl (id);
if (set_vl_size (vl) == -1 || set_svl_size (svl) == -1)
continue;
enable_za ();
dummy (); /* stop 1 */
}
for (int id = id_start; id <= id_end; id++)
{
int vl = test_id_to_vl (id);
int svl = test_id_to_svl (id);
if (set_vl_size (vl) == -1 || set_svl_size (svl) == -1)
continue;
disable_za ();
dummy (); /* stop 2 */
}
}
else
{
printf ("SKIP: no HWCAP_SVE or HWCAP2_SME on this system\n");
return -1;
}
return 0;
}
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