Formerly ./m68k/fpu/switch/switch.c.~5~
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/* Copyright (C) 1991 Free Software Foundation, Inc.
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/* Copyright (C) 1991, 1992 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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@ -27,11 +27,8 @@ Cambridge, MA 02139, USA. */
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#define TRAPSIG SIGILL
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#endif
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/* Nonzero if we have determined whether or not there is a 68881. */
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static int tested_fpu = 0;
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/* Nonzero if we have a 68881. */
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static int have_fpu;
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/* Zero if no 68881, one if we have a 68881, or -1 if we don't know yet. */
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static int have_fpu = -1;
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/* Signal handler for the trap that happens if we don't have a 68881. */
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@ -53,10 +50,10 @@ DEFUN(__68881_switch, (dummy), int dummy)
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struct switch_caller *CONST caller
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= (struct switch_caller *) (((short int *) *return_address_location) - 1);
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if (!tested_fpu)
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if (have_fpu < 0)
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{
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/* Figure out whether or not we have a 68881. */
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__sighandler_t handler = signal(TRAPSIG, trap);
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__sighandler_t handler = signal (TRAPSIG, trap);
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if (handler == SIG_ERR)
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/* We can't figure it out, so assume we don't have a 68881.
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This assumption will never cause us any problems other than
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@ -70,14 +67,11 @@ DEFUN(__68881_switch, (dummy), int dummy)
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If we don't have one, this will trap and the signal handler
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will clear `have_fpu'. */
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have_fpu = 1;
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asm("fnop");
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asm ("fnop");
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/* Restore the old signal handler. */
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(void) signal(TRAPSIG, handler);
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(void) signal (TRAPSIG, handler);
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}
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/* Say that we've tested for a 68881, so we only do it once. */
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tested_fpu = 1;
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}
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/* Modify the caller to be a jump to the appropriate address. */
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