1 /**************************************************************************** 2 * 3 * Realmode X86 Emulator Library 4 * 5 * Copyright (C) 1991-2004 SciTech Software, Inc. 6 * Copyright (C) David Mosberger-Tang 7 * Copyright (C) 1999 Egbert Eich 8 * 9 * ======================================================================== 10 * 11 * Permission to use, copy, modify, distribute, and sell this software and 12 * its documentation for any purpose is hereby granted without fee, 13 * provided that the above copyright notice appear in all copies and that 14 * both that copyright notice and this permission notice appear in 15 * supporting documentation, and that the name of the authors not be used 16 * in advertising or publicity pertaining to distribution of the software 17 * without specific, written prior permission. The authors makes no 18 * representations about the suitability of this software for any purpose. 19 * It is provided "as is" without express or implied warranty. 20 * 21 * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 22 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 23 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 24 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 25 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 26 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 27 * PERFORMANCE OF THIS SOFTWARE. 28 * 29 * ======================================================================== 30 * 31 * Language: ANSI C 32 * Environment: Any 33 * Developer: Kendall Bennett 34 * 35 * Description: Header file for x86 register definitions. 36 * 37 ****************************************************************************/ 38 39 #ifndef __X86EMU_REGS_H 40 #define __X86EMU_REGS_H 41 42 /*---------------------- Macros and type definitions ----------------------*/ 43 44 #pragma pack(1) 45 46 /* 47 * General EAX, EBX, ECX, EDX type registers. Note that for 48 * portability, and speed, the issue of byte swapping is not addressed 49 * in the registers. All registers are stored in the default format 50 * available on the host machine. The only critical issue is that the 51 * registers should line up EXACTLY in the same manner as they do in 52 * the 386. That is: 53 * 54 * EAX & 0xff === AL 55 * EAX & 0xffff == AX 56 * 57 * etc. The result is that alot of the calculations can then be 58 * done using the native instruction set fully. 59 */ 60 61 #ifdef __BIG_ENDIAN__ 62 63 typedef struct { 64 u32 e_reg; 65 } I32_reg_t; 66 67 typedef struct { 68 u16 filler0, x_reg; 69 } I16_reg_t; 70 71 typedef struct { 72 u8 filler0, filler1, h_reg, l_reg; 73 } I8_reg_t; 74 75 #else /* !__BIG_ENDIAN__ */ 76 77 typedef struct { 78 u32 e_reg; 79 } I32_reg_t; 80 81 typedef struct { 82 u16 x_reg; 83 } I16_reg_t; 84 85 typedef struct { 86 u8 l_reg, h_reg; 87 } I8_reg_t; 88 89 #endif /* BIG_ENDIAN */ 90 91 typedef union { 92 I32_reg_t I32_reg; 93 I16_reg_t I16_reg; 94 I8_reg_t I8_reg; 95 } i386_general_register; 96 97 struct i386_general_regs { 98 i386_general_register A, B, C, D; 99 }; 100 101 typedef struct i386_general_regs Gen_reg_t; 102 103 struct i386_special_regs { 104 i386_general_register SP, BP, SI, DI, IP; 105 u32 FLAGS; 106 }; 107 108 /* 109 * Segment registers here represent the 16 bit quantities 110 * CS, DS, ES, SS. 111 */ 112 113 #undef CS 114 #undef DS 115 #undef SS 116 #undef ES 117 #undef FS 118 #undef GS 119 120 struct i386_segment_regs { 121 u16 CS, DS, SS, ES, FS, GS; 122 }; 123 124 /* 8 bit registers */ 125 #define R_AH gen.A.I8_reg.h_reg 126 #define R_AL gen.A.I8_reg.l_reg 127 #define R_BH gen.B.I8_reg.h_reg 128 #define R_BL gen.B.I8_reg.l_reg 129 #define R_CH gen.C.I8_reg.h_reg 130 #define R_CL gen.C.I8_reg.l_reg 131 #define R_DH gen.D.I8_reg.h_reg 132 #define R_DL gen.D.I8_reg.l_reg 133 134 /* 16 bit registers */ 135 #define R_AX gen.A.I16_reg.x_reg 136 #define R_BX gen.B.I16_reg.x_reg 137 #define R_CX gen.C.I16_reg.x_reg 138 #define R_DX gen.D.I16_reg.x_reg 139 140 /* 32 bit extended registers */ 141 #define R_EAX gen.A.I32_reg.e_reg 142 #define R_EBX gen.B.I32_reg.e_reg 143 #define R_ECX gen.C.I32_reg.e_reg 144 #define R_EDX gen.D.I32_reg.e_reg 145 146 /* special registers */ 147 #define R_SP spc.SP.I16_reg.x_reg 148 #define R_BP spc.BP.I16_reg.x_reg 149 #define R_SI spc.SI.I16_reg.x_reg 150 #define R_DI spc.DI.I16_reg.x_reg 151 #define R_IP spc.IP.I16_reg.x_reg 152 #define R_FLG spc.FLAGS 153 154 /* special registers */ 155 #define R_SP spc.SP.I16_reg.x_reg 156 #define R_BP spc.BP.I16_reg.x_reg 157 #define R_SI spc.SI.I16_reg.x_reg 158 #define R_DI spc.DI.I16_reg.x_reg 159 #define R_IP spc.IP.I16_reg.x_reg 160 #define R_FLG spc.FLAGS 161 162 /* special registers */ 163 #define R_ESP spc.SP.I32_reg.e_reg 164 #define R_EBP spc.BP.I32_reg.e_reg 165 #define R_ESI spc.SI.I32_reg.e_reg 166 #define R_EDI spc.DI.I32_reg.e_reg 167 #define R_EIP spc.IP.I32_reg.e_reg 168 #define R_EFLG spc.FLAGS 169 170 /* segment registers */ 171 #define R_CS seg.CS 172 #define R_DS seg.DS 173 #define R_SS seg.SS 174 #define R_ES seg.ES 175 #define R_FS seg.FS 176 #define R_GS seg.GS 177 178 /* flag conditions */ 179 #define FB_CF 0x0001 /* CARRY flag */ 180 #define FB_PF 0x0004 /* PARITY flag */ 181 #define FB_AF 0x0010 /* AUX flag */ 182 #define FB_ZF 0x0040 /* ZERO flag */ 183 #define FB_SF 0x0080 /* SIGN flag */ 184 #define FB_TF 0x0100 /* TRAP flag */ 185 #define FB_IF 0x0200 /* INTERRUPT ENABLE flag */ 186 #define FB_DF 0x0400 /* DIR flag */ 187 #define FB_OF 0x0800 /* OVERFLOW flag */ 188 189 /* 80286 and above always have bit#1 set */ 190 #define F_ALWAYS_ON (0x0002) /* flag bits always on */ 191 192 /* 193 * Define a mask for only those flag bits we will ever pass back 194 * (via PUSHF) 195 */ 196 #define F_MSK (FB_CF|FB_PF|FB_AF|FB_ZF|FB_SF|FB_TF|FB_IF|FB_DF|FB_OF) 197 198 /* following bits masked in to a 16bit quantity */ 199 200 #define F_CF 0x0001 /* CARRY flag */ 201 #define F_PF 0x0004 /* PARITY flag */ 202 #define F_AF 0x0010 /* AUX flag */ 203 #define F_ZF 0x0040 /* ZERO flag */ 204 #define F_SF 0x0080 /* SIGN flag */ 205 #define F_TF 0x0100 /* TRAP flag */ 206 #define F_IF 0x0200 /* INTERRUPT ENABLE flag */ 207 #define F_DF 0x0400 /* DIR flag */ 208 #define F_OF 0x0800 /* OVERFLOW flag */ 209 210 #define TOGGLE_FLAG(flag) (M.x86.R_FLG ^= (flag)) 211 #define SET_FLAG(flag) (M.x86.R_FLG |= (flag)) 212 #define CLEAR_FLAG(flag) (M.x86.R_FLG &= ~(flag)) 213 #define ACCESS_FLAG(flag) (M.x86.R_FLG & (flag)) 214 #define CLEARALL_FLAG(m) (M.x86.R_FLG = 0) 215 216 #define CONDITIONAL_SET_FLAG(COND,FLAG) \ 217 if (COND) SET_FLAG(FLAG); else CLEAR_FLAG(FLAG) 218 219 #define F_PF_CALC 0x010000 /* PARITY flag has been calced */ 220 #define F_ZF_CALC 0x020000 /* ZERO flag has been calced */ 221 #define F_SF_CALC 0x040000 /* SIGN flag has been calced */ 222 223 #define F_ALL_CALC 0xff0000 /* All have been calced */ 224 225 /* 226 * Emulator machine state. 227 * Segment usage control. 228 */ 229 #define SYSMODE_SEG_DS_SS 0x00000001 230 #define SYSMODE_SEGOVR_CS 0x00000002 231 #define SYSMODE_SEGOVR_DS 0x00000004 232 #define SYSMODE_SEGOVR_ES 0x00000008 233 #define SYSMODE_SEGOVR_FS 0x00000010 234 #define SYSMODE_SEGOVR_GS 0x00000020 235 #define SYSMODE_SEGOVR_SS 0x00000040 236 #define SYSMODE_PREFIX_REPE 0x00000080 237 #define SYSMODE_PREFIX_REPNE 0x00000100 238 #define SYSMODE_PREFIX_DATA 0x00000200 239 #define SYSMODE_PREFIX_ADDR 0x00000400 240 #define SYSMODE_INTR_PENDING 0x10000000 241 #define SYSMODE_EXTRN_INTR 0x20000000 242 #define SYSMODE_HALTED 0x40000000 243 244 #define SYSMODE_SEGMASK (SYSMODE_SEG_DS_SS | \ 245 SYSMODE_SEGOVR_CS | \ 246 SYSMODE_SEGOVR_DS | \ 247 SYSMODE_SEGOVR_ES | \ 248 SYSMODE_SEGOVR_FS | \ 249 SYSMODE_SEGOVR_GS | \ 250 SYSMODE_SEGOVR_SS) 251 #define SYSMODE_CLRMASK (SYSMODE_SEG_DS_SS | \ 252 SYSMODE_SEGOVR_CS | \ 253 SYSMODE_SEGOVR_DS | \ 254 SYSMODE_SEGOVR_ES | \ 255 SYSMODE_SEGOVR_FS | \ 256 SYSMODE_SEGOVR_GS | \ 257 SYSMODE_SEGOVR_SS | \ 258 SYSMODE_PREFIX_DATA | \ 259 SYSMODE_PREFIX_ADDR) 260 261 #define INTR_SYNCH 0x1 262 #define INTR_ASYNCH 0x2 263 #define INTR_HALTED 0x4 264 265 typedef struct { 266 struct i386_general_regs gen; 267 struct i386_special_regs spc; 268 struct i386_segment_regs seg; 269 /* 270 * MODE contains information on: 271 * REPE prefix 2 bits repe,repne 272 * SEGMENT overrides 5 bits normal,DS,SS,CS,ES 273 * Delayed flag set 3 bits (zero, signed, parity) 274 * reserved 6 bits 275 * interrupt # 8 bits instruction raised interrupt 276 * BIOS video segregs 4 bits 277 * Interrupt Pending 1 bits 278 * Extern interrupt 1 bits 279 * Halted 1 bits 280 */ 281 long mode; 282 u8 intno; 283 volatile int intr; /* mask of pending interrupts */ 284 int debug; 285 #ifdef CONFIG_X86EMU_DEBUG 286 int check; 287 u16 saved_ip; 288 u16 saved_cs; 289 int enc_pos; 290 int enc_str_pos; 291 char decode_buf[32]; /* encoded byte stream */ 292 char decoded_buf[256]; /* disassembled strings */ 293 #endif 294 } X86EMU_regs; 295 296 /**************************************************************************** 297 REMARKS: 298 Structure maintaining the emulator machine state. 299 300 MEMBERS: 301 x86 - X86 registers 302 mem_base - Base real mode memory for the emulator 303 mem_size - Size of the real mode memory block for the emulator 304 ****************************************************************************/ 305 #undef x86 306 typedef struct { 307 X86EMU_regs x86; 308 u8 *mem_base; 309 u32 mem_size; 310 void *private; 311 } X86EMU_sysEnv; 312 313 #pragma pack() 314 315 /*----------------------------- Global Variables --------------------------*/ 316 317 #ifdef __cplusplus 318 extern "C" { /* Use "C" linkage when in C++ mode */ 319 #endif 320 321 /* Global emulator machine state. 322 * 323 * We keep it global to avoid pointer dereferences in the code for speed. 324 */ 325 326 extern X86EMU_sysEnv _X86EMU_env; 327 #define M _X86EMU_env 328 329 /*-------------------------- Function Prototypes --------------------------*/ 330 331 /* Function to log information at runtime */ 332 333 #ifndef __KERNEL__ 334 void printk(const char *fmt, ...); 335 #endif 336 337 #ifdef __cplusplus 338 } /* End of "C" linkage for C++ */ 339 #endif 340 #endif /* __X86EMU_REGS_H */ 341
