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i386: hvf: Drop copy of RFLAGS defines
[qemu.git] / target / i386 / hvf / x86_flags.c
CommitLineData
c97d6d2c
SAGDR		 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"
c97d6d2c 25
f9fea777 26#include "qemu-common.h"
895f9fdf 27#include "panic.h"
c97d6d2c
SAGDR		 28#include "cpu.h"
29#include "x86_flags.h"
30#include "x86.h"
31
e8a63257
PB		 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) { \
ff2de166 64 target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
e8a63257 65 (((lf_carries) >> (size - 2)) << LF_BIT_PO); \
ff2de166 66 env->hvf_emul->lflags.result = (target_ulong)(int##size##_t)(lf_result); \
e8a63257
PB		 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 } \
ff2de166 76 env->hvf_emul->lflags.auxbits = (target_ulong)(uint32_t)temp; \
e8a63257
PB		 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) { \
ff2de166 92 target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
e8a63257
PB		 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 } \
ff2de166
PB		 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; \
e8a63257 105 delta_c ^= (delta_c >> 1); \
ff2de166 106 env->hvf_emul->lflags.auxbits = (target_ulong)(uint32_t)(temp ^ delta_c); \
e8a63257
PB		 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
c97d6d2c
SAGDR		 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{
e8a63257 128 SET_FLAGS_OSZAPC_32(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 129}
130
131void SET_FLAGS_OSZAPC_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
132 uint16_t diff)
133{
e8a63257 134 SET_FLAGS_OSZAPC_16(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 135}
136
137void SET_FLAGS_OSZAPC_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
138 uint8_t diff)
139{
e8a63257 140 SET_FLAGS_OSZAPC_8(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 141}
142
143void SET_FLAGS_OSZAPC_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
144 uint32_t diff)
145{
e8a63257 146 SET_FLAGS_OSZAPC_32(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 147}
148
149void SET_FLAGS_OSZAPC_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
150 uint16_t diff)
151{
e8a63257 152 SET_FLAGS_OSZAPC_16(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 153}
154
155void SET_FLAGS_OSZAPC_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
156 uint8_t diff)
157{
e8a63257 158 SET_FLAGS_OSZAPC_8(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 159}
160
161void SET_FLAGS_OSZAP_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
162 uint32_t diff)
163{
e8a63257 164 SET_FLAGS_OSZAP_32(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 165}
166
167void SET_FLAGS_OSZAP_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
168 uint16_t diff)
169{
e8a63257 170 SET_FLAGS_OSZAP_16(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 171}
172
173void SET_FLAGS_OSZAP_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
174 uint8_t diff)
175{
e8a63257 176 SET_FLAGS_OSZAP_8(SUB_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 177}
178
179void SET_FLAGS_OSZAP_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
180 uint32_t diff)
181{
e8a63257 182 SET_FLAGS_OSZAP_32(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 183}
184
185void SET_FLAGS_OSZAP_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
186 uint16_t diff)
187{
e8a63257 188 SET_FLAGS_OSZAP_16(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 189}
190
191void SET_FLAGS_OSZAP_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
192 uint8_t diff)
193{
e8a63257 194 SET_FLAGS_OSZAP_8(ADD_COUT_VEC(v1, v2, diff), diff);
c97d6d2c
SAGDR		 195}
196
c97d6d2c 197
e8a63257
PB		 198void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t v1, uint32_t v2,
199 uint32_t diff)
c97d6d2c 200{
e8a63257 201 SET_FLAGS_OSZAPC_32(0, diff);
c97d6d2c
SAGDR		 202}
203
e8a63257
PB		 204void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t v1, uint16_t v2,
205 uint16_t diff)
c97d6d2c 206{
e8a63257 207 SET_FLAGS_OSZAPC_16(0, diff);
c97d6d2c
SAGDR		 208}
209
e8a63257
PB		 210void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t v1, uint8_t v2,
211 uint8_t diff)
c97d6d2c 212{
e8a63257 213 SET_FLAGS_OSZAPC_8(0, diff);
c97d6d2c
SAGDR		 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
c97d6d2c
SAGDR		 231bool get_OF(CPUX86State *env)
232{
e8a63257 233 return ((env->hvf_emul->lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
c97d6d2c
SAGDR		 234}
235
236bool get_CF(CPUX86State *env)
237{
e8a63257 238 return (env->hvf_emul->lflags.auxbits >> LF_BIT_CF) & 1;
c97d6d2c
SAGDR		 239}
240
241void set_OF(CPUX86State *env, bool val)
242{
e8a63257
PB		 243 bool old_cf = get_CF(env);
244 SET_FLAGS_OxxxxC(env, val, old_cf);
c97d6d2c
SAGDR		 245}
246
247void set_CF(CPUX86State *env, bool val)
248{
e8a63257
PB		 249 bool old_of = get_OF(env);
250 SET_FLAGS_OxxxxC(env, old_of, val);
c97d6d2c
SAGDR		 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);
e8a63257 261 env->hvf_emul->lflags.auxbits |= val << LF_BIT_AF;
c97d6d2c
SAGDR		 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 /* merge the parity bits into the Parity Delta Byte */
275 uint32_t temp_pdb = (255 & env->hvf_emul->lflags.result);
276 env->hvf_emul->lflags.auxbits ^= (temp_pdb << LF_BIT_PDB);
277 /* now zero the .result value */
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
c97d6d2c
SAGDR		 296void lflags_to_rflags(CPUX86State *env)
297{
967f4da2
RB		 298 env->eflags |= get_CF(env) ? CC_C : 0;
299 env->eflags |= get_PF(env) ? CC_P : 0;
300 env->eflags |= get_AF(env) ? CC_A : 0;
301 env->eflags |= get_ZF(env) ? CC_Z : 0;
302 env->eflags |= get_SF(env) ? CC_S : 0;
303 env->eflags |= get_OF(env) ? CC_O : 0;
c97d6d2c
SAGDR		 304}
305
306void rflags_to_lflags(CPUX86State *env)
307{
308 env->hvf_emul->lflags.auxbits = env->hvf_emul->lflags.result = 0;
967f4da2
RB		 309 set_OF(env, env->eflags & CC_O);
310 set_SF(env, env->eflags & CC_S);
311 set_ZF(env, env->eflags & CC_Z);
312 set_AF(env, env->eflags & CC_A);
313 set_PF(env, env->eflags & CC_P);
314 set_CF(env, env->eflags & CC_C);
c97d6d2c 315}
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