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/* Copyright (C) 2014 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <setjmp.h>
#include <sys/prctl.h>
#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
# error This test requires -mfpxx -mno-odd-spreg
#endif
/* This test verifies that mode changes between a setjmp and longjmp do
not corrupt the state of callee-saved registers. */
static int mode[6] =
{
0,
PR_FP_MODE_FR,
PR_FP_MODE_FR | PR_FP_MODE_FRE,
PR_FP_MODE_FR,
0,
PR_FP_MODE_FR | PR_FP_MODE_FRE
};
static jmp_buf env;
float check1 = 2.0;
double check2 = 3.0;
int
main (void)
{
int i;
int result = 0;
for (i = 0 ; i < 7 ; i++)
{
int retval;
register float test1 __asm ("$f20");
register double test2 __asm ("$f22");
/* Hide what we are doing to $f20 and $f22 from the compiler. */
__asm __volatile ("l.s %0,%2\n"
"l.d %1,%3\n"
: "=f" (test1), "=f" (test2)
: "m" (check1), "m" (check2));
retval = setjmp (env);
/* Make sure the compiler knows we want to access the variables
via the named registers again. */
__asm __volatile ("" : : "f" (test1), "f" (test2));
if (test1 != check1 || test2 != check2)
{
printf ("Corrupt register detected: $20 %f = %f, $22 %f = %f\n",
test1, check1, test2, check2);
result = 1;
}
if (retval == 0)
{
if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
&& errno != ENOTSUP)
{
printf ("prctl PR_SET_FP_MODE failed: %m");
exit (1);
}
longjmp (env, 0);
}
}
return result;
}
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