1 /*
2 * fp_cond.S
3 *
4 * Copyright Roman Zippel, 1997. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, and the entire permission notice in its entirety,
11 * including the disclaimer of warranties.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 * products derived from this software without specific prior
17 * written permission.
18 *
19 * ALTERNATIVELY, this product may be distributed under the terms of
20 * the GNU General Public License, in which case the provisions of the GPL are
21 * required INSTEAD OF the above restrictions. (This clause is
22 * necessary due to a potential bad interaction between the GPL and
23 * the restrictions contained in a BSD-style copyright.)
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
33 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
35 * OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include "fp_emu.h"
39 #include "fp_decode.h"
40
41 .globl fp_fscc, fp_fbccw, fp_fbccl
42
43 #ifdef FPU_EMU_DEBUG
44 fp_fnop:
45 printf PDECODE,"fnop\n"
46 jra fp_end
47 #else
48 #define fp_fnop fp_end
49 #endif
50
51 fp_fbccw:
52 tst.w %d2
53 jeq fp_fnop
54 printf PDECODE,"fbccw "
55 fp_get_pc %a0
56 lea (-2,%a0,%d2.w),%a0
57 jra 1f
58
59 fp_fbccl:
60 printf PDECODE,"fbccl "
61 fp_get_pc %a0
62 move.l %d2,%d0
63 swap %d0
64 fp_get_instr_word %d0,fp_err_ua1
65 lea (-2,%a0,%d0.l),%a0
66 1: printf PDECODE,"%x",1,%a0
67 move.l %d2,%d0
68 swap %d0
69 jsr fp_compute_cond
70 tst.l %d0
71 jeq 1f
72 fp_put_pc %a0,1
73 1: printf PDECODE,"\n"
74 jra fp_end
75
76 fp_fdbcc:
77 printf PDECODE,"fdbcc "
78 fp_get_pc %a1 | calculate new pc
79 fp_get_instr_word %d0,fp_err_ua1
80 add.w %d0,%a1
81 fp_decode_addr_reg
82 printf PDECODE,"d%d,%x\n",2,%d0,%a1
83 swap %d1 | test condition in %d1
84 tst.w %d1
85 jne 2f
86 move.l %d0,%d1
87 jsr fp_get_data_reg
88 subq.w #1,%d0
89 jcs 1f
90 fp_put_pc %a1,1
91 1: jsr fp_put_data_reg
92 2: jra fp_end
93
94 | set flags for decode macros for fs<cc>
95 do_fscc=1
96 do_no_pc_mode=1
97
98 fp_fscc:
99 printf PDECODE,"fscc "
100 move.l %d2,%d0
101 jsr fp_compute_cond
102 move.w %d0,%d1
103 swap %d1
104
105 | decode addressing mode
106 fp_decode_addr_mode
107
108 .long fp_data, fp_fdbcc
109 .long fp_indirect, fp_postinc
110 .long fp_predecr, fp_disp16
111 .long fp_extmode0, fp_extmode1
112
113 | addressing mode: data register direct
114 fp_data:
115 fp_mode_data_direct
116 move.w %d0,%d1 | save register nr
117 jsr fp_get_data_reg
118 swap %d1
119 move.b %d1,%d0
120 swap %d1
121 jsr fp_put_data_reg
122 printf PDECODE,"\n"
123 jra fp_end
124
125 fp_indirect:
126 fp_mode_addr_indirect
127 jra fp_do_scc
128
129 fp_postinc:
130 fp_mode_addr_indirect_postinc
131 jra fp_do_scc
132
133 fp_predecr:
134 fp_mode_addr_indirect_predec
135 jra fp_do_scc
136
137 fp_disp16:
138 fp_mode_addr_indirect_disp16
139 jra fp_do_scc
140
141 fp_extmode0:
142 fp_mode_addr_indirect_extmode0
143 jra fp_do_scc
144
145 fp_extmode1:
146 bfextu %d2{#13,#3},%d0
147 jmp ([0f:w,%pc,%d0*4])
148
149 .align 4
150 0:
151 .long fp_absolute_short, fp_absolute_long
152 .long fp_ill, fp_ill | NOTE: jump here to ftrap.x
153 .long fp_ill, fp_ill
154 .long fp_ill, fp_ill
155
156 fp_absolute_short:
157 fp_mode_abs_short
158 jra fp_do_scc
159
160 fp_absolute_long:
161 fp_mode_abs_long
162 | jra fp_do_scc
163
164 fp_do_scc:
165 swap %d1
166 putuser.b %d1,(%a0),fp_err_ua1,%a0
167 printf PDECODE,"\n"
168 jra fp_end
169
170
171 #define tst_NAN btst #24,%d1
172 #define tst_Z btst #26,%d1
173 #define tst_N btst #27,%d1
174
175 fp_compute_cond:
176 move.l (FPD_FPSR,FPDATA),%d1
177 btst #4,%d0
178 jeq 1f
179 tst_NAN
180 jeq 1f
181 bset #15,%d1
182 bset #7,%d1
183 move.l %d1,(FPD_FPSR,FPDATA)
184 1: and.w #0xf,%d0
185 jmp ([0f:w,%pc,%d0.w*4])
186
187 .align 4
188 0:
189 .long fp_f , fp_eq , fp_ogt, fp_oge
190 .long fp_olt, fp_ole, fp_ogl, fp_or
191 .long fp_un , fp_ueq, fp_ugt, fp_uge
192 .long fp_ult, fp_ule, fp_ne , fp_t
193
194 fp_f:
195 moveq #0,%d0
196 rts
197
198 fp_eq:
199 moveq #0,%d0
200 tst_Z
201 jeq 1f
202 moveq #-1,%d0
203 1: rts
204
205 fp_ogt:
206 moveq #0,%d0
207 tst_NAN
208 jne 1f
209 tst_Z
210 jne 1f
211 tst_N
212 jne 1f
213 moveq #-1,%d0
214 1: rts
215
216 fp_oge:
217 moveq #-1,%d0
218 tst_Z
219 jne 2f
220 tst_NAN
221 jne 1f
222 tst_N
223 jeq 2f
224 1: moveq #0,%d0
225 2: rts
226
227 fp_olt:
228 moveq #0,%d0
229 tst_NAN
230 jne 1f
231 tst_Z
232 jne 1f
233 tst_N
234 jeq 1f
235 moveq #-1,%d0
236 1: rts
237
238 fp_ole:
239 moveq #-1,%d0
240 tst_Z
241 jne 2f
242 tst_NAN
243 jne 1f
244 tst_N
245 jne 2f
246 1: moveq #0,%d0
247 2: rts
248
249 fp_ogl:
250 moveq #0,%d0
251 tst_NAN
252 jne 1f
253 tst_Z
254 jne 1f
255 moveq #-1,%d0
256 1: rts
257
258 fp_or:
259 moveq #0,%d0
260 tst_NAN
261 jne 1f
262 moveq #-1,%d0
263 1: rts
264
265 fp_un:
266 moveq #0,%d0
267 tst_NAN
268 jeq 1f
269 moveq #-1,%d0
270 rts
271
272 fp_ueq:
273 moveq #-1,%d0
274 tst_NAN
275 jne 1f
276 tst_Z
277 jne 1f
278 moveq #0,%d0
279 1: rts
280
281 fp_ugt:
282 moveq #-1,%d0
283 tst_NAN
284 jne 2f
285 tst_N
286 jne 1f
287 tst_Z
288 jeq 2f
289 1: moveq #0,%d0
290 2: rts
291
292 fp_uge:
293 moveq #-1,%d0
294 tst_NAN
295 jne 1f
296 tst_Z
297 jne 1f
298 tst_N
299 jeq 1f
300 moveq #0,%d0
301 1: rts
302
303 fp_ult:
304 moveq #-1,%d0
305 tst_NAN
306 jne 2f
307 tst_Z
308 jne 1f
309 tst_N
310 jne 2f
311 1: moveq #0,%d0
312 2: rts
313
314 fp_ule:
315 moveq #-1,%d0
316 tst_NAN
317 jne 1f
318 tst_Z
319 jne 1f
320 tst_N
321 jne 1f
322 moveq #0,%d0
323 1: rts
324
325 fp_ne:
326 moveq #0,%d0
327 tst_Z
328 jne 1f
329 moveq #-1,%d0
330 1: rts
331
332 fp_t:
333 moveq #-1,%d0
334 rts
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