1 /* FPU-related code for x86 and x86_64 processors.
2 Copyright (C) 2005-2013 Free Software Foundation, Inc.
3 Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
7 Libgfortran is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either
10 version 3 of the License, or (at your option) any later version.
12 Libgfortran is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
30 #if defined(__sun__) && defined(__svr4__)
34 static volatile sig_atomic_t sigill_caught
;
37 sigill_hdlr (int sig
__attribute((unused
)),
38 siginfo_t
*sip
__attribute__((unused
)),
42 /* Set PC to the instruction after the faulting one to skip over it,
43 otherwise we enter an infinite loop. 3 is the size of the movaps
45 ucp
->uc_mcontext
.gregs
[EIP
] += 3;
54 unsigned int eax
, ebx
, ecx
, edx
;
56 if (!__get_cpuid (1, &eax
, &ebx
, &ecx
, &edx
))
59 #if defined(__sun__) && defined(__svr4__)
60 /* Solaris 2 before Solaris 9 4/04 cannot execute SSE instructions even
61 if the CPU supports them. Programs receive SIGILL instead, so check
62 for that at runtime. */
66 struct sigaction act
, oact
;
68 act
.sa_handler
= sigill_hdlr
;
69 sigemptyset (&act
.sa_mask
);
70 /* Need to set SA_SIGINFO so a ucontext_t * is passed to the handler. */
71 act
.sa_flags
= SA_SIGINFO
;
72 sigaction (SIGILL
, &act
, &oact
);
74 /* We need a single SSE instruction here so the handler can safely skip
76 __asm__
__volatile__ ("movaps\t%xmm0,%xmm0");
78 sigaction (SIGILL
, &oact
, NULL
);
83 #endif /* __sun__ && __svr4__ */
91 /* i387 -- see linux <fpu_control.h> header file for details. */
92 #define _FPU_MASK_IM 0x01
93 #define _FPU_MASK_DM 0x02
94 #define _FPU_MASK_ZM 0x04
95 #define _FPU_MASK_OM 0x08
96 #define _FPU_MASK_UM 0x10
97 #define _FPU_MASK_PM 0x20
98 #define _FPU_MASK_ALL 0x3f
100 #define _FPU_EX_ALL 0x3f
107 __asm__
__volatile__ ("fstcw\t%0" : "=m" (cw
));
109 if (options
.fpe
& GFC_FPE_INVALID
) excepts
|= _FPU_MASK_IM
;
110 if (options
.fpe
& GFC_FPE_DENORMAL
) excepts
|= _FPU_MASK_DM
;
111 if (options
.fpe
& GFC_FPE_ZERO
) excepts
|= _FPU_MASK_ZM
;
112 if (options
.fpe
& GFC_FPE_OVERFLOW
) excepts
|= _FPU_MASK_OM
;
113 if (options
.fpe
& GFC_FPE_UNDERFLOW
) excepts
|= _FPU_MASK_UM
;
114 if (options
.fpe
& GFC_FPE_INEXACT
) excepts
|= _FPU_MASK_PM
;
119 __asm__
__volatile__ ("fnclex\n\tfldcw\t%0" : : "m" (cw
));
125 __asm__
__volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse
));
127 /* The SSE exception masks are shifted by 7 bits. */
128 cw_sse
|= _FPU_MASK_ALL
<< 7;
129 cw_sse
&= ~(excepts
<< 7);
131 /* Clear stalled exception flags. */
132 cw_sse
&= ~_FPU_EX_ALL
;
134 __asm__
__volatile__ ("%vldmxcsr\t%0" : : "m" (cw_sse
));
139 get_fpu_except_flags (void)
145 __asm__
__volatile__ ("fnstsw\t%0" : "=a" (cw
));
152 __asm__
__volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse
));
156 excepts
&= _FPU_EX_ALL
;
158 if (excepts
& _FPU_MASK_IM
) result
|= GFC_FPE_INVALID
;
159 if (excepts
& _FPU_MASK_DM
) result
|= GFC_FPE_DENORMAL
;
160 if (excepts
& _FPU_MASK_ZM
) result
|= GFC_FPE_ZERO
;
161 if (excepts
& _FPU_MASK_OM
) result
|= GFC_FPE_OVERFLOW
;
162 if (excepts
& _FPU_MASK_UM
) result
|= GFC_FPE_UNDERFLOW
;
163 if (excepts
& _FPU_MASK_PM
) result
|= GFC_FPE_INEXACT
;