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91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <setjmp.h>
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#include <sys/prctl.h>
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#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
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# error This test requires -mfpxx -mno-odd-spreg
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#endif
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/* This test verifies that mode changes between a setjmp and longjmp do
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not corrupt the state of callee-saved registers. */
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static int mode[6] =
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{
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0,
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PR_FP_MODE_FR,
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PR_FP_MODE_FR | PR_FP_MODE_FRE,
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PR_FP_MODE_FR,
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0,
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PR_FP_MODE_FR | PR_FP_MODE_FRE
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};
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static jmp_buf env;
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float check1 = 2.0;
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double check2 = 3.0;
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int
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main (void)
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{
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int i;
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int result = 0;
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for (i = 0 ; i < 7 ; i++)
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{
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int retval;
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register float test1 __asm ("$f20");
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register double test2 __asm ("$f22");
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/* Hide what we are doing to $f20 and $f22 from the compiler. */
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__asm __volatile ("l.s %0,%2\n"
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"l.d %1,%3\n"
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: "=f" (test1), "=f" (test2)
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: "m" (check1), "m" (check2));
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retval = setjmp (env);
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/* Make sure the compiler knows we want to access the variables
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via the named registers again. */
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__asm __volatile ("" : : "f" (test1), "f" (test2));
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if (test1 != check1 || test2 != check2)
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{
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printf ("Corrupt register detected: $20 %f = %f, $22 %f = %f\n",
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test1, check1, test2, check2);
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result = 1;
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}
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if (retval == 0)
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{
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if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
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&& errno != ENOTSUP)
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{
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printf ("prctl PR_SET_FP_MODE failed: %m");
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exit (1);
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}
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longjmp (env, 0);
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}
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}
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return result;
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}
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