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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
34
35#define LF_SIGN_BIT 31
36
37#define LF_BIT_SD (0)
38#define LF_BIT_AF (3)
39#define LF_BIT_PDB (8)
40#define LF_BIT_CF (31)
41#define LF_BIT_PO (30)
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
60
61
62
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_emul->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_emul->lflags.auxbits = (target_ulong)(uint32_t)temp; \
77}
78
79
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
89
90
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_emul->lflags.result = (target_ulong)(int##size##_t)(lf_result); \
104 target_ulong delta_c = (env->hvf_emul->lflags.auxbits ^ temp) & LF_MASK_CF; \
105 delta_c ^= (delta_c >> 1); \
106 env->hvf_emul->lflags.auxbits = (target_ulong)(uint32_t)(temp ^ delta_c); \
107}
108
109
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
117void 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_emul->lflags.auxbits &= ~(LF_MASK_PO | LF_MASK_CF);
121 env->hvf_emul->lflags.auxbits |= (temp_po << LF_BIT_PO) |
122 (new_cf << LF_BIT_CF);
123}
124
125void SET_FLAGS_OSZAPC_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
126 uint32_t diff)
127{
128 SET_FLAGS_OSZAPC_32(SUB_COUT_VEC(v1, v2, diff), diff);
129}
130
131void SET_FLAGS_OSZAPC_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
132 uint16_t diff)
133{
134 SET_FLAGS_OSZAPC_16(SUB_COUT_VEC(v1, v2, diff), diff);
135}
136
137void SET_FLAGS_OSZAPC_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
138 uint8_t diff)
139{
140 SET_FLAGS_OSZAPC_8(SUB_COUT_VEC(v1, v2, diff), diff);
141}
142
143void SET_FLAGS_OSZAPC_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
144 uint32_t diff)
145{
146 SET_FLAGS_OSZAPC_32(ADD_COUT_VEC(v1, v2, diff), diff);
147}
148
149void SET_FLAGS_OSZAPC_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
150 uint16_t diff)
151{
152 SET_FLAGS_OSZAPC_16(ADD_COUT_VEC(v1, v2, diff), diff);
153}
154
155void SET_FLAGS_OSZAPC_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
156 uint8_t diff)
157{
158 SET_FLAGS_OSZAPC_8(ADD_COUT_VEC(v1, v2, diff), diff);
159}
160
161void SET_FLAGS_OSZAP_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
162 uint32_t diff)
163{
164 SET_FLAGS_OSZAP_32(SUB_COUT_VEC(v1, v2, diff), diff);
165}
166
167void SET_FLAGS_OSZAP_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
168 uint16_t diff)
169{
170 SET_FLAGS_OSZAP_16(SUB_COUT_VEC(v1, v2, diff), diff);
171}
172
173void SET_FLAGS_OSZAP_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
174 uint8_t diff)
175{
176 SET_FLAGS_OSZAP_8(SUB_COUT_VEC(v1, v2, diff), diff);
177}
178
179void SET_FLAGS_OSZAP_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
180 uint32_t diff)
181{
182 SET_FLAGS_OSZAP_32(ADD_COUT_VEC(v1, v2, diff), diff);
183}
184
185void SET_FLAGS_OSZAP_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
186 uint16_t diff)
187{
188 SET_FLAGS_OSZAP_16(ADD_COUT_VEC(v1, v2, diff), diff);
189}
190
191void SET_FLAGS_OSZAP_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
192 uint8_t diff)
193{
194 SET_FLAGS_OSZAP_8(ADD_COUT_VEC(v1, v2, diff), diff);
195}
196
197
198void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t v1, uint32_t v2,
199 uint32_t diff)
200{
201 SET_FLAGS_OSZAPC_32(0, diff);
202}
203
204void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t v1, uint16_t v2,
205 uint16_t diff)
206{
207 SET_FLAGS_OSZAPC_16(0, diff);
208}
209
210void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t v1, uint8_t v2,
211 uint8_t diff)
212{
213 SET_FLAGS_OSZAPC_8(0, diff);
214}
215
216bool get_PF(CPUX86State *env)
217{
218 uint32_t temp = (255 & env->hvf_emul->lflags.result);
219 temp = temp ^ (255 & (env->hvf_emul->lflags.auxbits >> LF_BIT_PDB));
220 temp = (temp ^ (temp >> 4)) & 0x0F;
221 return (0x9669U >> temp) & 1;
222}
223
224void set_PF(CPUX86State *env, bool val)
225{
226 uint32_t temp = (255 & env->hvf_emul->lflags.result) ^ (!val);
227 env->hvf_emul->lflags.auxbits &= ~(LF_MASK_PDB);
228 env->hvf_emul->lflags.auxbits |= (temp << LF_BIT_PDB);
229}
230
231bool get_OF(CPUX86State *env)
232{
233 return ((env->hvf_emul->lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
234}
235
236bool get_CF(CPUX86State *env)
237{
238 return (env->hvf_emul->lflags.auxbits >> LF_BIT_CF) & 1;
239}
240
241void set_OF(CPUX86State *env, bool val)
242{
243 bool old_cf = get_CF(env);
244 SET_FLAGS_OxxxxC(env, val, old_cf);
245}
246
247void set_CF(CPUX86State *env, bool val)
248{
249 bool old_of = get_OF(env);
250 SET_FLAGS_OxxxxC(env, old_of, val);
251}
252
253bool get_AF(CPUX86State *env)
254{
255 return (env->hvf_emul->lflags.auxbits >> LF_BIT_AF) & 1;
256}
257
258void set_AF(CPUX86State *env, bool val)
259{
260 env->hvf_emul->lflags.auxbits &= ~(LF_MASK_AF);
261 env->hvf_emul->lflags.auxbits |= val << LF_BIT_AF;
262}
263
264bool get_ZF(CPUX86State *env)
265{
266 return !env->hvf_emul->lflags.result;
267}
268
269void set_ZF(CPUX86State *env, bool val)
270{
271 if (val) {
272 env->hvf_emul->lflags.auxbits ^=
273 (((env->hvf_emul->lflags.result >> LF_SIGN_BIT) & 1) << LF_BIT_SD);
274
275 uint32_t temp_pdb = (255 & env->hvf_emul->lflags.result);
276 env->hvf_emul->lflags.auxbits ^= (temp_pdb << LF_BIT_PDB);
277
278 env->hvf_emul->lflags.result = 0;
279 } else {
280 env->hvf_emul->lflags.result |= (1 << 8);
281 }
282}
283
284bool get_SF(CPUX86State *env)
285{
286 return ((env->hvf_emul->lflags.result >> LF_SIGN_BIT) ^
287 (env->hvf_emul->lflags.auxbits >> LF_BIT_SD)) & 1;
288}
289
290void set_SF(CPUX86State *env, bool val)
291{
292 bool temp_sf = get_SF(env);
293 env->hvf_emul->lflags.auxbits ^= (temp_sf ^ val) << LF_BIT_SD;
294}
295
296void lflags_to_rflags(CPUX86State *env)
297{
298 env->hvf_emul->rflags.cf = get_CF(env);
299 env->hvf_emul->rflags.pf = get_PF(env);
300 env->hvf_emul->rflags.af = get_AF(env);
301 env->hvf_emul->rflags.zf = get_ZF(env);
302 env->hvf_emul->rflags.sf = get_SF(env);
303 env->hvf_emul->rflags.of = get_OF(env);
304}
305
306void rflags_to_lflags(CPUX86State *env)
307{
308 env->hvf_emul->lflags.auxbits = env->hvf_emul->lflags.result = 0;
309 set_OF(env, env->hvf_emul->rflags.of);
310 set_SF(env, env->hvf_emul->rflags.sf);
311 set_ZF(env, env->hvf_emul->rflags.zf);
312 set_AF(env, env->hvf_emul->rflags.af);
313 set_PF(env, env->hvf_emul->rflags.pf);
314 set_CF(env, env->hvf_emul->rflags.cf);
315}
316