| 1 | /* $NetBSD: x86emu.h,v 1.1 2007/12/01 20:14:10 joerg Exp $ */ |
| 2 | |
| 3 | /**************************************************************************** |
| 4 | * |
| 5 | * Realmode X86 Emulator Library |
| 6 | * |
| 7 | * Copyright (C) 1996-1999 SciTech Software, Inc. |
| 8 | * Copyright (C) David Mosberger-Tang |
| 9 | * Copyright (C) 1999 Egbert Eich |
| 10 | * Copyright (C) 2007 Joerg Sonnenberger |
| 11 | * |
| 12 | * ======================================================================== |
| 13 | * |
| 14 | * Permission to use, copy, modify, distribute, and sell this software and |
| 15 | * its documentation for any purpose is hereby granted without fee, |
| 16 | * provided that the above copyright notice appear in all copies and that |
| 17 | * both that copyright notice and this permission notice appear in |
| 18 | * supporting documentation, and that the name of the authors not be used |
| 19 | * in advertising or publicity pertaining to distribution of the software |
| 20 | * without specific, written prior permission. The authors makes no |
| 21 | * representations about the suitability of this software for any purpose. |
| 22 | * It is provided "as is" without express or implied warranty. |
| 23 | * |
| 24 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 25 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 26 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 27 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
| 28 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
| 29 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 30 | * PERFORMANCE OF THIS SOFTWARE. |
| 31 | * |
| 32 | ****************************************************************************/ |
| 33 | |
| 34 | #ifndef __X86EMU_X86EMU_H |
| 35 | #define __X86EMU_X86EMU_H |
| 36 | |
| 37 | #include <sys/types.h> |
| 38 | #include <sys/endian.h> |
| 39 | |
| 40 | #ifdef _KERNEL |
| 41 | #include <sys/systm.h> |
| 42 | #else |
| 43 | #include <setjmp.h> |
| 44 | #endif |
| 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 | struct X86EMU_register32 { |
| 64 | uint32_t e_reg; |
| 65 | }; |
| 66 | |
| 67 | struct X86EMU_register16 { |
| 68 | uint16_t filler0; |
| 69 | uint16_t x_reg; |
| 70 | }; |
| 71 | |
| 72 | struct X86EMU_register8 { |
| 73 | uint8_t filler0, filler1; |
| 74 | uint8_t h_reg, l_reg; |
| 75 | }; |
| 76 | |
| 77 | #else /* !__BIG_ENDIAN__ */ |
| 78 | |
| 79 | struct X86EMU_register32 { |
| 80 | uint32_t e_reg; |
| 81 | }; |
| 82 | |
| 83 | struct X86EMU_register16 { |
| 84 | uint16_t x_reg; |
| 85 | }; |
| 86 | |
| 87 | struct X86EMU_register8 { |
| 88 | uint8_t l_reg, h_reg; |
| 89 | }; |
| 90 | |
| 91 | #endif /* BIG_ENDIAN */ |
| 92 | |
| 93 | union X86EMU_register { |
| 94 | struct X86EMU_register32 I32_reg; |
| 95 | struct X86EMU_register16 I16_reg; |
| 96 | struct X86EMU_register8 I8_reg; |
| 97 | }; |
| 98 | |
| 99 | struct X86EMU_regs { |
| 100 | uint16_t register_cs; |
| 101 | uint16_t register_ds; |
| 102 | uint16_t register_es; |
| 103 | uint16_t register_fs; |
| 104 | uint16_t register_gs; |
| 105 | uint16_t register_ss; |
| 106 | uint32_t register_flags; |
| 107 | union X86EMU_register register_a; |
| 108 | union X86EMU_register register_b; |
| 109 | union X86EMU_register register_c; |
| 110 | union X86EMU_register register_d; |
| 111 | |
| 112 | union X86EMU_register register_sp; |
| 113 | union X86EMU_register register_bp; |
| 114 | union X86EMU_register register_si; |
| 115 | union X86EMU_register register_di; |
| 116 | union X86EMU_register register_ip; |
| 117 | |
| 118 | /* |
| 119 | * MODE contains information on: |
| 120 | * REPE prefix 2 bits repe,repne |
| 121 | * SEGMENT overrides 5 bits normal,DS,SS,CS,ES |
| 122 | * Delayed flag set 3 bits (zero, signed, parity) |
| 123 | * reserved 6 bits |
| 124 | * interrupt # 8 bits instruction raised interrupt |
| 125 | * BIOS video segregs 4 bits |
| 126 | * Interrupt Pending 1 bits |
| 127 | * Extern interrupt 1 bits |
| 128 | * Halted 1 bits |
| 129 | */ |
| 130 | uint32_t mode; |
| 131 | volatile int intr; /* mask of pending interrupts */ |
| 132 | uint8_t intno; |
| 133 | uint8_t __pad[3]; |
| 134 | }; |
| 135 | |
| 136 | struct X86EMU { |
| 137 | char *mem_base; |
| 138 | size_t mem_size; |
| 139 | void *sys_private; |
| 140 | struct X86EMU_regs x86; |
| 141 | |
| 142 | #ifdef _KERNEL |
| 143 | label_t exec_state; |
| 144 | #else |
| 145 | jmp_buf exec_state; |
| 146 | #endif |
| 147 | |
| 148 | uint64_t cur_cycles; |
| 149 | |
| 150 | unsigned int cur_mod:2; |
| 151 | unsigned int cur_rl:3; |
| 152 | unsigned int cur_rh:3; |
| 153 | uint32_t cur_offset; |
| 154 | |
| 155 | uint8_t (*emu_rdb)(struct X86EMU *, uint32_t addr); |
| 156 | uint16_t (*emu_rdw)(struct X86EMU *, uint32_t addr); |
| 157 | uint32_t (*emu_rdl)(struct X86EMU *, uint32_t addr); |
| 158 | void (*emu_wrb)(struct X86EMU *, uint32_t addr,uint8_t val); |
| 159 | void (*emu_wrw)(struct X86EMU *, uint32_t addr, uint16_t val); |
| 160 | void (*emu_wrl)(struct X86EMU *, uint32_t addr, uint32_t val); |
| 161 | |
| 162 | uint8_t (*emu_inb)(struct X86EMU *, uint16_t addr); |
| 163 | uint16_t (*emu_inw)(struct X86EMU *, uint16_t addr); |
| 164 | uint32_t (*emu_inl)(struct X86EMU *, uint16_t addr); |
| 165 | void (*emu_outb)(struct X86EMU *, uint16_t addr, uint8_t val); |
| 166 | void (*emu_outw)(struct X86EMU *, uint16_t addr, uint16_t val); |
| 167 | void (*emu_outl)(struct X86EMU *, uint16_t addr, uint32_t val); |
| 168 | |
| 169 | void (*_X86EMU_intrTab[256])(struct X86EMU *, int); |
| 170 | }; |
| 171 | |
| 172 | __BEGIN_DECLS |
| 173 | |
| 174 | void X86EMU_init_default(struct X86EMU *); |
| 175 | |
| 176 | /* decode.c */ |
| 177 | |
| 178 | void X86EMU_exec(struct X86EMU *); |
| 179 | void X86EMU_exec_call(struct X86EMU *, uint16_t, uint16_t); |
| 180 | void X86EMU_exec_intr(struct X86EMU *, uint8_t); |
| 181 | void X86EMU_halt_sys(struct X86EMU *) __dead; |
| 182 | |
| 183 | __END_DECLS |
| 184 | |
| 185 | #endif /* __X86EMU_X86EMU_H */ |
| 186 | |