i386: hvf: Move lazy_flags into CPUX86State
[qemu.git] / target / i386 / hvf / x86_flags.c
1 /////////////////////////////////////////////////////////////////////////
2 //
3 // Copyright (C) 2001-2012 The Bochs Project
4 // Copyright (C) 2017 Google Inc.
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., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
19 /////////////////////////////////////////////////////////////////////////
20 /*
21 * flags functions
22 */
23
24 #include "qemu/osdep.h"
25
26 #include "qemu-common.h"
27 #include "panic.h"
28 #include "cpu.h"
29 #include "x86_flags.h"
30 #include "x86.h"
31
32
33 /* this is basically bocsh code */
34
35 #define LF_SIGN_BIT 31
36
37 #define LF_BIT_SD (0) /* lazy Sign Flag Delta */
38 #define LF_BIT_AF (3) /* lazy Adjust flag */
39 #define LF_BIT_PDB (8) /* lazy Parity Delta Byte (8 bits) */
40 #define LF_BIT_CF (31) /* lazy Carry Flag */
41 #define LF_BIT_PO (30) /* lazy Partial Overflow = CF ^ OF */
42
43 #define LF_MASK_SD (0x01 << LF_BIT_SD)
44 #define LF_MASK_AF (0x01 << LF_BIT_AF)
45 #define LF_MASK_PDB (0xFF << LF_BIT_PDB)
46 #define LF_MASK_CF (0x01 << LF_BIT_CF)
47 #define LF_MASK_PO (0x01 << LF_BIT_PO)
48
49 #define ADD_COUT_VEC(op1, op2, result) \
50 (((op1) & (op2)) | (((op1) | (op2)) & (~(result))))
51
52 #define SUB_COUT_VEC(op1, op2, result) \
53 (((~(op1)) & (op2)) | (((~(op1)) ^ (op2)) & (result)))
54
55 #define GET_ADD_OVERFLOW(op1, op2, result, mask) \
56 ((((op1) ^ (result)) & ((op2) ^ (result))) & (mask))
57
58 /* ******************* */
59 /* OSZAPC */
60 /* ******************* */
61
62 /* size, carries, result */
63 #define SET_FLAGS_OSZAPC_SIZE(size, lf_carries, lf_result) { \
64 target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
65 (((lf_carries) >> (size - 2)) << LF_BIT_PO); \
66 env->hvf_lflags.result = (target_ulong)(int##size##_t)(lf_result); \
67 if ((size) == 32) { \
68 temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
69 } else if ((size) == 16) { \
70 temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
71 } else if ((size) == 8) { \
72 temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
73 } else { \
74 VM_PANIC("unimplemented"); \
75 } \
76 env->hvf_lflags.auxbits = (target_ulong)(uint32_t)temp; \
77 }
78
79 /* carries, result */
80 #define SET_FLAGS_OSZAPC_8(carries, result) \
81 SET_FLAGS_OSZAPC_SIZE(8, carries, result)
82 #define SET_FLAGS_OSZAPC_16(carries, result) \
83 SET_FLAGS_OSZAPC_SIZE(16, carries, result)
84 #define SET_FLAGS_OSZAPC_32(carries, result) \
85 SET_FLAGS_OSZAPC_SIZE(32, carries, result)
86
87 /* ******************* */
88 /* OSZAP */
89 /* ******************* */
90 /* size, carries, result */
91 #define SET_FLAGS_OSZAP_SIZE(size, lf_carries, lf_result) { \
92 target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
93 (((lf_carries) >> (size - 2)) << LF_BIT_PO); \
94 if ((size) == 32) { \
95 temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
96 } else if ((size) == 16) { \
97 temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
98 } else if ((size) == 8) { \
99 temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
100 } else { \
101 VM_PANIC("unimplemented"); \
102 } \
103 env->hvf_lflags.result = (target_ulong)(int##size##_t)(lf_result); \
104 target_ulong delta_c = (env->hvf_lflags.auxbits ^ temp) & LF_MASK_CF; \
105 delta_c ^= (delta_c >> 1); \
106 env->hvf_lflags.auxbits = (target_ulong)(uint32_t)(temp ^ delta_c); \
107 }
108
109 /* carries, result */
110 #define SET_FLAGS_OSZAP_8(carries, result) \
111 SET_FLAGS_OSZAP_SIZE(8, carries, result)
112 #define SET_FLAGS_OSZAP_16(carries, result) \
113 SET_FLAGS_OSZAP_SIZE(16, carries, result)
114 #define SET_FLAGS_OSZAP_32(carries, result) \
115 SET_FLAGS_OSZAP_SIZE(32, carries, result)
116
117 void SET_FLAGS_OxxxxC(CPUX86State *env, uint32_t new_of, uint32_t new_cf)
118 {
119 uint32_t temp_po = new_of ^ new_cf;
120 env->hvf_lflags.auxbits &= ~(LF_MASK_PO | LF_MASK_CF);
121 env->hvf_lflags.auxbits |= (temp_po << LF_BIT_PO) | (new_cf << LF_BIT_CF);
122 }
123
124 void SET_FLAGS_OSZAPC_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
125 uint32_t diff)
126 {
127 SET_FLAGS_OSZAPC_32(SUB_COUT_VEC(v1, v2, diff), diff);
128 }
129
130 void SET_FLAGS_OSZAPC_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
131 uint16_t diff)
132 {
133 SET_FLAGS_OSZAPC_16(SUB_COUT_VEC(v1, v2, diff), diff);
134 }
135
136 void SET_FLAGS_OSZAPC_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
137 uint8_t diff)
138 {
139 SET_FLAGS_OSZAPC_8(SUB_COUT_VEC(v1, v2, diff), diff);
140 }
141
142 void SET_FLAGS_OSZAPC_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
143 uint32_t diff)
144 {
145 SET_FLAGS_OSZAPC_32(ADD_COUT_VEC(v1, v2, diff), diff);
146 }
147
148 void SET_FLAGS_OSZAPC_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
149 uint16_t diff)
150 {
151 SET_FLAGS_OSZAPC_16(ADD_COUT_VEC(v1, v2, diff), diff);
152 }
153
154 void SET_FLAGS_OSZAPC_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
155 uint8_t diff)
156 {
157 SET_FLAGS_OSZAPC_8(ADD_COUT_VEC(v1, v2, diff), diff);
158 }
159
160 void SET_FLAGS_OSZAP_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
161 uint32_t diff)
162 {
163 SET_FLAGS_OSZAP_32(SUB_COUT_VEC(v1, v2, diff), diff);
164 }
165
166 void SET_FLAGS_OSZAP_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
167 uint16_t diff)
168 {
169 SET_FLAGS_OSZAP_16(SUB_COUT_VEC(v1, v2, diff), diff);
170 }
171
172 void SET_FLAGS_OSZAP_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
173 uint8_t diff)
174 {
175 SET_FLAGS_OSZAP_8(SUB_COUT_VEC(v1, v2, diff), diff);
176 }
177
178 void SET_FLAGS_OSZAP_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
179 uint32_t diff)
180 {
181 SET_FLAGS_OSZAP_32(ADD_COUT_VEC(v1, v2, diff), diff);
182 }
183
184 void SET_FLAGS_OSZAP_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
185 uint16_t diff)
186 {
187 SET_FLAGS_OSZAP_16(ADD_COUT_VEC(v1, v2, diff), diff);
188 }
189
190 void SET_FLAGS_OSZAP_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
191 uint8_t diff)
192 {
193 SET_FLAGS_OSZAP_8(ADD_COUT_VEC(v1, v2, diff), diff);
194 }
195
196
197 void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t v1, uint32_t v2,
198 uint32_t diff)
199 {
200 SET_FLAGS_OSZAPC_32(0, diff);
201 }
202
203 void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t v1, uint16_t v2,
204 uint16_t diff)
205 {
206 SET_FLAGS_OSZAPC_16(0, diff);
207 }
208
209 void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t v1, uint8_t v2,
210 uint8_t diff)
211 {
212 SET_FLAGS_OSZAPC_8(0, diff);
213 }
214
215 bool get_PF(CPUX86State *env)
216 {
217 uint32_t temp = (255 & env->hvf_lflags.result);
218 temp = temp ^ (255 & (env->hvf_lflags.auxbits >> LF_BIT_PDB));
219 temp = (temp ^ (temp >> 4)) & 0x0F;
220 return (0x9669U >> temp) & 1;
221 }
222
223 void set_PF(CPUX86State *env, bool val)
224 {
225 uint32_t temp = (255 & env->hvf_lflags.result) ^ (!val);
226 env->hvf_lflags.auxbits &= ~(LF_MASK_PDB);
227 env->hvf_lflags.auxbits |= (temp << LF_BIT_PDB);
228 }
229
230 bool get_OF(CPUX86State *env)
231 {
232 return ((env->hvf_lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
233 }
234
235 bool get_CF(CPUX86State *env)
236 {
237 return (env->hvf_lflags.auxbits >> LF_BIT_CF) & 1;
238 }
239
240 void set_OF(CPUX86State *env, bool val)
241 {
242 bool old_cf = get_CF(env);
243 SET_FLAGS_OxxxxC(env, val, old_cf);
244 }
245
246 void set_CF(CPUX86State *env, bool val)
247 {
248 bool old_of = get_OF(env);
249 SET_FLAGS_OxxxxC(env, old_of, val);
250 }
251
252 bool get_AF(CPUX86State *env)
253 {
254 return (env->hvf_lflags.auxbits >> LF_BIT_AF) & 1;
255 }
256
257 void set_AF(CPUX86State *env, bool val)
258 {
259 env->hvf_lflags.auxbits &= ~(LF_MASK_AF);
260 env->hvf_lflags.auxbits |= val << LF_BIT_AF;
261 }
262
263 bool get_ZF(CPUX86State *env)
264 {
265 return !env->hvf_lflags.result;
266 }
267
268 void set_ZF(CPUX86State *env, bool val)
269 {
270 if (val) {
271 env->hvf_lflags.auxbits ^=
272 (((env->hvf_lflags.result >> LF_SIGN_BIT) & 1) << LF_BIT_SD);
273 /* merge the parity bits into the Parity Delta Byte */
274 uint32_t temp_pdb = (255 & env->hvf_lflags.result);
275 env->hvf_lflags.auxbits ^= (temp_pdb << LF_BIT_PDB);
276 /* now zero the .result value */
277 env->hvf_lflags.result = 0;
278 } else {
279 env->hvf_lflags.result |= (1 << 8);
280 }
281 }
282
283 bool get_SF(CPUX86State *env)
284 {
285 return ((env->hvf_lflags.result >> LF_SIGN_BIT) ^
286 (env->hvf_lflags.auxbits >> LF_BIT_SD)) & 1;
287 }
288
289 void set_SF(CPUX86State *env, bool val)
290 {
291 bool temp_sf = get_SF(env);
292 env->hvf_lflags.auxbits ^= (temp_sf ^ val) << LF_BIT_SD;
293 }
294
295 void lflags_to_rflags(CPUX86State *env)
296 {
297 env->eflags |= get_CF(env) ? CC_C : 0;
298 env->eflags |= get_PF(env) ? CC_P : 0;
299 env->eflags |= get_AF(env) ? CC_A : 0;
300 env->eflags |= get_ZF(env) ? CC_Z : 0;
301 env->eflags |= get_SF(env) ? CC_S : 0;
302 env->eflags |= get_OF(env) ? CC_O : 0;
303 }
304
305 void rflags_to_lflags(CPUX86State *env)
306 {
307 env->hvf_lflags.auxbits = env->hvf_lflags.result = 0;
308 set_OF(env, env->eflags & CC_O);
309 set_SF(env, env->eflags & CC_S);
310 set_ZF(env, env->eflags & CC_Z);
311 set_AF(env, env->eflags & CC_A);
312 set_PF(env, env->eflags & CC_P);
313 set_CF(env, env->eflags & CC_C);
314 }