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/* Test TLSDESC relocation with AMX.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <asm/prctl.h>
#include <support/check.h>
#include "tst-gnu2-tls2-amx.h"
extern int arch_prctl (int, ...);
#define X86_XSTATE_TILECFG_ID 17
#define X86_XSTATE_TILEDATA_ID 18
/* Initialize tile config. */
__attribute_optimization_barrier__
static void
init_tile_config (__tilecfg *tileinfo)
{
int i;
tileinfo->palette_id = 1;
tileinfo->start_row = 0;
tileinfo->colsb[0] = MAX_ROWS;
tileinfo->rows[0] = MAX_ROWS;
for (i = 1; i < 4; ++i)
{
tileinfo->colsb[i] = MAX_COLS;
tileinfo->rows[i] = MAX_ROWS;
}
_tile_loadconfig (tileinfo);
}
static bool
enable_amx (void)
{
uint64_t bitmask;
if (arch_prctl (ARCH_GET_XCOMP_PERM, &bitmask) != 0)
return false;
if ((bitmask & (1 << X86_XSTATE_TILECFG_ID)) == 0)
return false;
if (arch_prctl (ARCH_REQ_XCOMP_PERM, X86_XSTATE_TILEDATA_ID) != 0)
return false;
/* Load tile configuration. */
__tilecfg tile_data = { 0 };
init_tile_config (&tile_data);
return true;
}
/* An architecture can define it to clobber caller-saved registers in
malloc below to verify that the implicit TLSDESC call won't change
caller-saved registers. */
static void
clear_tile_register (void)
{
_tile_zero (2);
}
#define MOD(i) "tst-gnu2-tls2-amx-mod" #i ".so"
#define IS_SUPPORTED() enable_amx ()
#define PREPARE_MALLOC() clear_tile_register ()
#include <elf/tst-gnu2-tls2.c>
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