|
1 /* |
|
2 * i386 helpers |
|
3 * |
|
4 * Copyright (c) 2008 Fabrice Bellard |
|
5 * |
|
6 * This library is free software; you can redistribute it and/or |
|
7 * modify it under the terms of the GNU Lesser General Public |
|
8 * License as published by the Free Software Foundation; either |
|
9 * version 2 of the License, or (at your option) any later version. |
|
10 * |
|
11 * This library 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 GNU |
|
14 * Lesser General Public License for more details. |
|
15 * |
|
16 * You should have received a copy of the GNU Lesser General Public |
|
17 * License along with this library; if not, write to the Free Software |
|
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
19 */ |
|
20 #define DATA_BITS (1 << (3 + SHIFT)) |
|
21 #define SHIFT_MASK (DATA_BITS - 1) |
|
22 #define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1)) |
|
23 #if DATA_BITS <= 32 |
|
24 #define SHIFT1_MASK 0x1f |
|
25 #else |
|
26 #define SHIFT1_MASK 0x3f |
|
27 #endif |
|
28 |
|
29 #if DATA_BITS == 8 |
|
30 #define SUFFIX b |
|
31 #define DATA_TYPE uint8_t |
|
32 #define DATA_STYPE int8_t |
|
33 #define DATA_MASK 0xff |
|
34 #elif DATA_BITS == 16 |
|
35 #define SUFFIX w |
|
36 #define DATA_TYPE uint16_t |
|
37 #define DATA_STYPE int16_t |
|
38 #define DATA_MASK 0xffff |
|
39 #elif DATA_BITS == 32 |
|
40 #define SUFFIX l |
|
41 #define DATA_TYPE uint32_t |
|
42 #define DATA_STYPE int32_t |
|
43 #define DATA_MASK 0xffffffff |
|
44 #elif DATA_BITS == 64 |
|
45 #define SUFFIX q |
|
46 #define DATA_TYPE uint64_t |
|
47 #define DATA_STYPE int64_t |
|
48 #define DATA_MASK 0xffffffffffffffffULL |
|
49 #else |
|
50 #error unhandled operand size |
|
51 #endif |
|
52 |
|
53 /* dynamic flags computation */ |
|
54 |
|
55 static int glue(compute_all_add, SUFFIX)(void) |
|
56 { |
|
57 int cf, pf, af, zf, sf, of; |
|
58 target_long src1, src2; |
|
59 src1 = CC_SRC; |
|
60 src2 = CC_DST - CC_SRC; |
|
61 cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; |
|
62 pf = parity_table[(uint8_t)CC_DST]; |
|
63 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
64 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
65 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
66 of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
|
67 return cf | pf | af | zf | sf | of; |
|
68 } |
|
69 |
|
70 static int glue(compute_c_add, SUFFIX)(void) |
|
71 { |
|
72 int cf; |
|
73 target_long src1; |
|
74 src1 = CC_SRC; |
|
75 cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; |
|
76 return cf; |
|
77 } |
|
78 |
|
79 static int glue(compute_all_adc, SUFFIX)(void) |
|
80 { |
|
81 int cf, pf, af, zf, sf, of; |
|
82 target_long src1, src2; |
|
83 src1 = CC_SRC; |
|
84 src2 = CC_DST - CC_SRC - 1; |
|
85 cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; |
|
86 pf = parity_table[(uint8_t)CC_DST]; |
|
87 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
88 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
89 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
90 of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
|
91 return cf | pf | af | zf | sf | of; |
|
92 } |
|
93 |
|
94 static int glue(compute_c_adc, SUFFIX)(void) |
|
95 { |
|
96 int cf; |
|
97 target_long src1; |
|
98 src1 = CC_SRC; |
|
99 cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; |
|
100 return cf; |
|
101 } |
|
102 |
|
103 static int glue(compute_all_sub, SUFFIX)(void) |
|
104 { |
|
105 int cf, pf, af, zf, sf, of; |
|
106 target_long src1, src2; |
|
107 src1 = CC_DST + CC_SRC; |
|
108 src2 = CC_SRC; |
|
109 cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; |
|
110 pf = parity_table[(uint8_t)CC_DST]; |
|
111 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
112 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
113 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
114 of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
|
115 return cf | pf | af | zf | sf | of; |
|
116 } |
|
117 |
|
118 static int glue(compute_c_sub, SUFFIX)(void) |
|
119 { |
|
120 int cf; |
|
121 target_long src1, src2; |
|
122 src1 = CC_DST + CC_SRC; |
|
123 src2 = CC_SRC; |
|
124 cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; |
|
125 return cf; |
|
126 } |
|
127 |
|
128 static int glue(compute_all_sbb, SUFFIX)(void) |
|
129 { |
|
130 int cf, pf, af, zf, sf, of; |
|
131 target_long src1, src2; |
|
132 src1 = CC_DST + CC_SRC + 1; |
|
133 src2 = CC_SRC; |
|
134 cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; |
|
135 pf = parity_table[(uint8_t)CC_DST]; |
|
136 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
137 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
138 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
139 of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; |
|
140 return cf | pf | af | zf | sf | of; |
|
141 } |
|
142 |
|
143 static int glue(compute_c_sbb, SUFFIX)(void) |
|
144 { |
|
145 int cf; |
|
146 target_long src1, src2; |
|
147 src1 = CC_DST + CC_SRC + 1; |
|
148 src2 = CC_SRC; |
|
149 cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; |
|
150 return cf; |
|
151 } |
|
152 |
|
153 static int glue(compute_all_logic, SUFFIX)(void) |
|
154 { |
|
155 int cf, pf, af, zf, sf, of; |
|
156 cf = 0; |
|
157 pf = parity_table[(uint8_t)CC_DST]; |
|
158 af = 0; |
|
159 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
160 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
161 of = 0; |
|
162 return cf | pf | af | zf | sf | of; |
|
163 } |
|
164 |
|
165 static int glue(compute_c_logic, SUFFIX)(void) |
|
166 { |
|
167 return 0; |
|
168 } |
|
169 |
|
170 static int glue(compute_all_inc, SUFFIX)(void) |
|
171 { |
|
172 int cf, pf, af, zf, sf, of; |
|
173 target_long src1, src2; |
|
174 src1 = CC_DST - 1; |
|
175 src2 = 1; |
|
176 cf = CC_SRC; |
|
177 pf = parity_table[(uint8_t)CC_DST]; |
|
178 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
179 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
180 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
181 of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11; |
|
182 return cf | pf | af | zf | sf | of; |
|
183 } |
|
184 |
|
185 #if DATA_BITS == 32 |
|
186 static int glue(compute_c_inc, SUFFIX)(void) |
|
187 { |
|
188 return CC_SRC; |
|
189 } |
|
190 #endif |
|
191 |
|
192 static int glue(compute_all_dec, SUFFIX)(void) |
|
193 { |
|
194 int cf, pf, af, zf, sf, of; |
|
195 target_long src1, src2; |
|
196 src1 = CC_DST + 1; |
|
197 src2 = 1; |
|
198 cf = CC_SRC; |
|
199 pf = parity_table[(uint8_t)CC_DST]; |
|
200 af = (CC_DST ^ src1 ^ src2) & 0x10; |
|
201 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
202 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
203 of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11; |
|
204 return cf | pf | af | zf | sf | of; |
|
205 } |
|
206 |
|
207 static int glue(compute_all_shl, SUFFIX)(void) |
|
208 { |
|
209 int cf, pf, af, zf, sf, of; |
|
210 cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C; |
|
211 pf = parity_table[(uint8_t)CC_DST]; |
|
212 af = 0; /* undefined */ |
|
213 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
214 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
215 /* of is defined if shift count == 1 */ |
|
216 of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; |
|
217 return cf | pf | af | zf | sf | of; |
|
218 } |
|
219 |
|
220 static int glue(compute_c_shl, SUFFIX)(void) |
|
221 { |
|
222 return (CC_SRC >> (DATA_BITS - 1)) & CC_C; |
|
223 } |
|
224 |
|
225 #if DATA_BITS == 32 |
|
226 static int glue(compute_c_sar, SUFFIX)(void) |
|
227 { |
|
228 return CC_SRC & 1; |
|
229 } |
|
230 #endif |
|
231 |
|
232 static int glue(compute_all_sar, SUFFIX)(void) |
|
233 { |
|
234 int cf, pf, af, zf, sf, of; |
|
235 cf = CC_SRC & 1; |
|
236 pf = parity_table[(uint8_t)CC_DST]; |
|
237 af = 0; /* undefined */ |
|
238 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
239 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
240 /* of is defined if shift count == 1 */ |
|
241 of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; |
|
242 return cf | pf | af | zf | sf | of; |
|
243 } |
|
244 |
|
245 #if DATA_BITS == 32 |
|
246 static int glue(compute_c_mul, SUFFIX)(void) |
|
247 { |
|
248 int cf; |
|
249 cf = (CC_SRC != 0); |
|
250 return cf; |
|
251 } |
|
252 #endif |
|
253 |
|
254 /* NOTE: we compute the flags like the P4. On olders CPUs, only OF and |
|
255 CF are modified and it is slower to do that. */ |
|
256 static int glue(compute_all_mul, SUFFIX)(void) |
|
257 { |
|
258 int cf, pf, af, zf, sf, of; |
|
259 cf = (CC_SRC != 0); |
|
260 pf = parity_table[(uint8_t)CC_DST]; |
|
261 af = 0; /* undefined */ |
|
262 zf = ((DATA_TYPE)CC_DST == 0) << 6; |
|
263 sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; |
|
264 of = cf << 11; |
|
265 return cf | pf | af | zf | sf | of; |
|
266 } |
|
267 |
|
268 /* shifts */ |
|
269 |
|
270 target_ulong glue(helper_rcl, SUFFIX)(target_ulong t0, target_ulong t1) |
|
271 { |
|
272 int count, eflags; |
|
273 target_ulong src; |
|
274 target_long res; |
|
275 |
|
276 count = t1 & SHIFT1_MASK; |
|
277 #if DATA_BITS == 16 |
|
278 count = rclw_table[count]; |
|
279 #elif DATA_BITS == 8 |
|
280 count = rclb_table[count]; |
|
281 #endif |
|
282 if (count) { |
|
283 eflags = helper_cc_compute_all(CC_OP); |
|
284 t0 &= DATA_MASK; |
|
285 src = t0; |
|
286 res = (t0 << count) | ((target_ulong)(eflags & CC_C) << (count - 1)); |
|
287 if (count > 1) |
|
288 res |= t0 >> (DATA_BITS + 1 - count); |
|
289 t0 = res; |
|
290 env->cc_tmp = (eflags & ~(CC_C | CC_O)) | |
|
291 (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | |
|
292 ((src >> (DATA_BITS - count)) & CC_C); |
|
293 } else { |
|
294 env->cc_tmp = -1; |
|
295 } |
|
296 return t0; |
|
297 } |
|
298 |
|
299 target_ulong glue(helper_rcr, SUFFIX)(target_ulong t0, target_ulong t1) |
|
300 { |
|
301 int count, eflags; |
|
302 target_ulong src; |
|
303 target_long res; |
|
304 |
|
305 count = t1 & SHIFT1_MASK; |
|
306 #if DATA_BITS == 16 |
|
307 count = rclw_table[count]; |
|
308 #elif DATA_BITS == 8 |
|
309 count = rclb_table[count]; |
|
310 #endif |
|
311 if (count) { |
|
312 eflags = helper_cc_compute_all(CC_OP); |
|
313 t0 &= DATA_MASK; |
|
314 src = t0; |
|
315 res = (t0 >> count) | ((target_ulong)(eflags & CC_C) << (DATA_BITS - count)); |
|
316 if (count > 1) |
|
317 res |= t0 << (DATA_BITS + 1 - count); |
|
318 t0 = res; |
|
319 env->cc_tmp = (eflags & ~(CC_C | CC_O)) | |
|
320 (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | |
|
321 ((src >> (count - 1)) & CC_C); |
|
322 } else { |
|
323 env->cc_tmp = -1; |
|
324 } |
|
325 return t0; |
|
326 } |
|
327 |
|
328 #undef DATA_BITS |
|
329 #undef SHIFT_MASK |
|
330 #undef SHIFT1_MASK |
|
331 #undef SIGN_MASK |
|
332 #undef DATA_TYPE |
|
333 #undef DATA_STYPE |
|
334 #undef DATA_MASK |
|
335 #undef SUFFIX |