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/* Test for SME longjmp.
Copyright (C) 2023-2025 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
<https://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <ucontext.h>
#include <sys/auxv.h>
#include <support/check.h>
#include <support/support.h>
#include <support/test-driver.h>
#include "tst-sme-helper.h"
static uint8_t *za_orig;
static uint8_t *za_dump;
static uint8_t *za_save;
static void
print_data(const char *msg, void *p)
{
unsigned char *a = p;
printf ("%s:\n", msg);
for (int i = 0; i < svl; i++)
{
printf ("%d: ", i);
for (int j = 0; j < svl; j++)
printf("%02x,", a[i*svl+j]);
printf("\n");
}
printf(".\n");
fflush (stdout);
}
__attribute__ ((noinline))
static void
do_longjmp (jmp_buf env)
{
longjmp (env, 1);
}
__attribute__ ((noinline))
static void
do_setcontext (const ucontext_t *p)
{
setcontext (p);
}
static void
longjmp_test (void)
{
unsigned long svcr;
jmp_buf env;
void *p;
int r;
struct blk blk = {za_save, svl, {0}};
printf ("longjmp test:\n");
p = get_tpidr2 ();
printf ("initial tp2 = %p\n", p);
if (p != NULL)
FAIL_EXIT1 ("tpidr2 is not initialized to 0");
svcr = get_svcr ();
if (svcr != 0)
FAIL_EXIT1 ("svcr != 0: %lu", svcr);
set_tpidr2 (&blk);
start_za ();
load_za (za_orig);
print_data ("za save space", za_save);
p = get_tpidr2 ();
printf ("before setjmp: tp2 = %p\n", p);
if (p != &blk)
FAIL_EXIT1 ("tpidr2 is not set to BLK %p", (void *)&blk);
if (setjmp (env) == 0)
{
p = get_tpidr2 ();
printf ("before longjmp: tp2 = %p\n", p);
if (p != NULL)
FAIL_EXIT1 ("tpidr2 has not been reset to null");
do_longjmp (env);
FAIL_EXIT1 ("longjmp returned");
}
p = get_tpidr2 ();
printf ("after longjmp: tp2 = %p\n", p);
if (p != NULL)
FAIL_EXIT1 ("tpidr2 is not set to 0");
svcr = get_svcr ();
if (svcr != 0)
FAIL_EXIT1 ("svcr != 0: %lu", svcr);
print_data ("za save space", za_save);
r = memcmp (za_orig, za_save, svl*svl);
if (r != 0)
FAIL_EXIT1 ("saving za failed");
}
static void
setcontext_test (void)
{
volatile int setcontext_done = 0;
unsigned long svcr;
ucontext_t ctx;
void *p;
int r;
struct blk blk = {za_save, svl, {0}};
printf ("setcontext test:\n");
p = get_tpidr2 ();
printf ("initial tp2 = %p\n", p);
if (p != NULL)
FAIL_EXIT1 ("tpidr2 is not initialized to 0");
svcr = get_svcr ();
if (svcr != 0)
FAIL_EXIT1 ("svcr != 0: %lu", svcr);
set_tpidr2 (&blk);
start_za ();
load_za (za_orig);
print_data ("za save space", za_save);
p = get_tpidr2 ();
printf ("before getcontext: tp2 = %p\n", p);
if (p != &blk)
FAIL_EXIT1 ("tpidr2 is not set to BLK %p", (void *)&blk);
r = getcontext (&ctx);
if (r != 0)
FAIL_EXIT1 ("getcontext failed");
if (setcontext_done == 0)
{
p = get_tpidr2 ();
printf ("before setcontext: tp2 = %p\n", p);
if (p != &blk)
FAIL_EXIT1 ("tpidr2 is clobbered");
setcontext_done = 1;
do_setcontext (&ctx);
FAIL_EXIT1 ("setcontext returned");
}
p = get_tpidr2 ();
printf ("after setcontext: tp2 = %p\n", p);
if (p != NULL)
FAIL_EXIT1 ("tpidr2 is not set to 0");
svcr = get_svcr ();
if (svcr != 0)
FAIL_EXIT1 ("svcr != 0: %lu", svcr);
print_data ("za save space", za_save);
r = memcmp (za_orig, za_save, svl*svl);
if (r != 0)
FAIL_EXIT1 ("saving za failed");
}
static int
do_test (void)
{
unsigned long hwcap2;
hwcap2 = getauxval (AT_HWCAP2);
if ((hwcap2 & HWCAP2_SME) == 0)
return EXIT_UNSUPPORTED;
svl = get_svl ();
printf ("svl: %lu\n", svl);
if (svl < 16 || svl % 16 != 0 || svl >= (1 << 16))
FAIL_EXIT1 ("invalid svl");
za_orig = xmalloc (svl*svl);
za_save = xmalloc (svl*svl);
za_dump = xmalloc (svl*svl);
memset (za_orig, 1, svl*svl);
memset (za_save, 2, svl*svl);
memset (za_dump, 3, svl*svl);
for (int i = 0; i < svl; i++)
for (int j = 0; j < svl; j++)
za_orig[i*svl+j] = i*svl+j;
print_data ("original data", za_orig);
longjmp_test ();
memset (za_save, 2, svl*svl);
memset (za_dump, 3, svl*svl);
setcontext_test ();
free (za_orig);
free (za_save);
free (za_dump);
return 0;
}
#include <support/test-driver.c>
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