Commit | Line | Data |
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c906108c SS |
1 | /* Intel 387 floating point stuff. |
2 | Copyright (C) 1988, 1989, 1991, 1998 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "language.h" | |
d4f3574e | 25 | #include "value.h" |
c906108c SS |
26 | #include "gdbcore.h" |
27 | #include "floatformat.h" | |
28 | ||
29 | void i387_to_double PARAMS ((char *, char *)); | |
c906108c SS |
30 | void double_to_i387 PARAMS ((char *, char *)); |
31 | ||
d4f3574e SS |
32 | static void print_387_control_bits PARAMS ((unsigned int control)); |
33 | static void print_387_status_bits PARAMS ((unsigned int status)); | |
34 | ||
c906108c SS |
35 | /* FIXME: Eliminate these routines when we have the time to change all |
36 | the callers. */ | |
37 | ||
38 | void | |
39 | i387_to_double (from, to) | |
40 | char *from; | |
41 | char *to; | |
42 | { | |
c5aa993b | 43 | floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
c906108c SS |
44 | } |
45 | ||
46 | void | |
47 | double_to_i387 (from, to) | |
48 | char *from; | |
49 | char *to; | |
50 | { | |
c5aa993b | 51 | floatformat_from_double (&floatformat_i387_ext, (double *) from, to); |
c906108c SS |
52 | } |
53 | ||
d4f3574e SS |
54 | static void |
55 | print_387_control_bits (control) | |
c906108c SS |
56 | unsigned int control; |
57 | { | |
c5aa993b | 58 | switch ((control >> 8) & 3) |
c906108c | 59 | { |
c5aa993b | 60 | case 0: |
d4f3574e | 61 | puts_unfiltered (" 24 bit; "); |
c5aa993b JM |
62 | break; |
63 | case 1: | |
d4f3574e | 64 | puts_unfiltered (" (bad); "); |
c5aa993b JM |
65 | break; |
66 | case 2: | |
d4f3574e | 67 | puts_unfiltered (" 53 bit; "); |
c5aa993b JM |
68 | break; |
69 | case 3: | |
d4f3574e | 70 | puts_unfiltered (" 64 bit; "); |
c5aa993b | 71 | break; |
c906108c | 72 | } |
c5aa993b | 73 | switch ((control >> 10) & 3) |
c906108c | 74 | { |
c5aa993b | 75 | case 0: |
d4f3574e | 76 | puts_unfiltered ("NEAR; "); |
c5aa993b JM |
77 | break; |
78 | case 1: | |
d4f3574e | 79 | puts_unfiltered ("DOWN; "); |
c5aa993b JM |
80 | break; |
81 | case 2: | |
d4f3574e | 82 | puts_unfiltered ("UP; "); |
c5aa993b JM |
83 | break; |
84 | case 3: | |
d4f3574e | 85 | puts_unfiltered ("CHOP; "); |
c5aa993b | 86 | break; |
c906108c | 87 | } |
c5aa993b | 88 | if (control & 0x3f) |
c906108c | 89 | { |
d4f3574e | 90 | puts_unfiltered ("mask"); |
c5aa993b | 91 | if (control & 0x0001) |
d4f3574e | 92 | puts_unfiltered (" INVAL"); |
c5aa993b | 93 | if (control & 0x0002) |
d4f3574e | 94 | puts_unfiltered (" DENOR"); |
c5aa993b | 95 | if (control & 0x0004) |
d4f3574e | 96 | puts_unfiltered (" DIVZ"); |
c5aa993b | 97 | if (control & 0x0008) |
d4f3574e | 98 | puts_unfiltered (" OVERF"); |
c5aa993b | 99 | if (control & 0x0010) |
d4f3574e | 100 | puts_unfiltered (" UNDER"); |
c5aa993b | 101 | if (control & 0x0020) |
d4f3574e SS |
102 | puts_unfiltered (" LOS"); |
103 | puts_unfiltered (";"); | |
c906108c | 104 | } |
cff3e48b | 105 | |
c5aa993b | 106 | if (control & 0xe080) |
d4f3574e | 107 | warning ("\nreserved bits on: %s", |
c5aa993b | 108 | local_hex_string (control & 0xe080)); |
c906108c SS |
109 | } |
110 | ||
111 | void | |
d4f3574e SS |
112 | print_387_control_word (control) |
113 | unsigned int control; | |
114 | { | |
115 | printf_filtered ("control %s:", local_hex_string(control & 0xffff)); | |
116 | print_387_control_bits (control); | |
117 | puts_unfiltered ("\n"); | |
118 | } | |
119 | ||
120 | static void | |
121 | print_387_status_bits (status) | |
c906108c SS |
122 | unsigned int status; |
123 | { | |
d4f3574e | 124 | printf_unfiltered (" flags %d%d%d%d; ", |
c5aa993b JM |
125 | (status & 0x4000) != 0, |
126 | (status & 0x0400) != 0, | |
127 | (status & 0x0200) != 0, | |
128 | (status & 0x0100) != 0); | |
d4f3574e SS |
129 | printf_unfiltered ("top %d; ", (status >> 11) & 7); |
130 | if (status & 0xff) | |
131 | { | |
132 | puts_unfiltered ("excep"); | |
133 | if (status & 0x0001) puts_unfiltered (" INVAL"); | |
134 | if (status & 0x0002) puts_unfiltered (" DENOR"); | |
135 | if (status & 0x0004) puts_unfiltered (" DIVZ"); | |
136 | if (status & 0x0008) puts_unfiltered (" OVERF"); | |
137 | if (status & 0x0010) puts_unfiltered (" UNDER"); | |
138 | if (status & 0x0020) puts_unfiltered (" LOS"); | |
139 | if (status & 0x0040) puts_unfiltered (" STACK"); | |
140 | } | |
141 | } | |
142 | ||
143 | void | |
144 | print_387_status_word (status) | |
145 | unsigned int status; | |
146 | { | |
147 | printf_filtered ("status %s:", local_hex_string (status & 0xffff)); | |
148 | print_387_status_bits (status); | |
149 | puts_unfiltered ("\n"); | |
150 | } | |
151 | ||
d4f3574e SS |
152 | #ifdef LD_I387 |
153 | int | |
154 | i387_extract_floating (PTR addr, int len, DOUBLEST *dretptr) | |
155 | { | |
156 | if (len == TARGET_LONG_DOUBLE_BIT / 8) | |
157 | { | |
158 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
159 | { | |
160 | DOUBLEST retval; | |
161 | ||
162 | memcpy (dretptr, addr, sizeof (retval)); | |
163 | } | |
164 | else | |
165 | floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, dretptr); | |
166 | ||
167 | return 1; | |
168 | } | |
169 | else | |
170 | return 0; | |
171 | } | |
172 | ||
173 | int | |
174 | i387_store_floating (PTR addr, int len, DOUBLEST val) | |
175 | { | |
176 | if (len == TARGET_LONG_DOUBLE_BIT / 8) | |
177 | { | |
178 | /* This `if' may be totally stupid. I just put it in here to be | |
179 | absolutely sure I'm preserving the semantics of the code I'm | |
180 | frobbing, while I try to maintain portability boundaries; I | |
181 | don't actually know exactly what it's doing. -JimB, May 1999 */ | |
182 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
183 | memcpy (addr, &val, sizeof (val)); | |
184 | else | |
185 | floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr); | |
186 | ||
187 | return 1; | |
188 | } | |
189 | else | |
190 | return 0; | |
c906108c | 191 | } |
d4f3574e | 192 | #endif /* LD_I387 */ |