diff options
Diffstat (limited to 'drivers/bios_emulator/x86emu/decode.c')
| -rw-r--r-- | drivers/bios_emulator/x86emu/decode.c | 874 |
1 files changed, 435 insertions, 439 deletions
diff --git a/drivers/bios_emulator/x86emu/decode.c b/drivers/bios_emulator/x86emu/decode.c index b4dbb20797..1e2dcfe4b2 100644 --- a/drivers/bios_emulator/x86emu/decode.c +++ b/drivers/bios_emulator/x86emu/decode.c @@ -1,10 +1,10 @@ /**************************************************************************** * -* Realmode X86 Emulator Library +* Realmode X86 Emulator Library * -* Copyright (C) 1991-2004 SciTech Software, Inc. -* Copyright (C) David Mosberger-Tang -* Copyright (C) 1999 Egbert Eich +* Copyright (C) 1991-2004 SciTech Software, Inc. +* Copyright (C) David Mosberger-Tang +* Copyright (C) 1999 Egbert Eich * * ======================================================================== * @@ -14,7 +14,7 @@ * both that copyright notice and this permission notice appear in * supporting documentation, and that the name of the authors not be used * in advertising or publicity pertaining to distribution of the software -* without specific, written prior permission. The authors makes no +* without specific, written prior permission. The authors makes no * representations about the suitability of this software for any purpose. * It is provided "as is" without express or implied warranty. * @@ -28,12 +28,12 @@ * * ======================================================================== * -* Language: ANSI C -* Environment: Any -* Developer: Kendall Bennett +* Language: ANSI C +* Environment: Any +* Developer: Kendall Bennett * -* Description: This file includes subroutines which are related to -* instruction decoding and accessess of immediate data via IP. etc. +* Description: This file includes subroutines which are related to +* instruction decoding and accessess of immediate data via IP. etc. * ****************************************************************************/ @@ -47,22 +47,22 @@ Handles any pending asychronous interrupts. ****************************************************************************/ static void x86emu_intr_handle(void) { - u8 intno; + u8 intno; if (M.x86.intr & INTR_SYNCH) { - intno = M.x86.intno; - if (_X86EMU_intrTab[intno]) { - (*_X86EMU_intrTab[intno])(intno); - } else { - push_word((u16)M.x86.R_FLG); - CLEAR_FLAG(F_IF); - CLEAR_FLAG(F_TF); - push_word(M.x86.R_CS); - M.x86.R_CS = mem_access_word(intno * 4 + 2); - push_word(M.x86.R_IP); - M.x86.R_IP = mem_access_word(intno * 4); - M.x86.intr = 0; - } + intno = M.x86.intno; + if (_X86EMU_intrTab[intno]) { + (*_X86EMU_intrTab[intno])(intno); + } else { + push_word((u16)M.x86.R_FLG); + CLEAR_FLAG(F_IF); + CLEAR_FLAG(F_TF); + push_word(M.x86.R_CS); + M.x86.R_CS = mem_access_word(intno * 4 + 2); + push_word(M.x86.R_IP); + M.x86.R_IP = mem_access_word(intno * 4); + M.x86.intr = 0; + } } } @@ -95,34 +95,34 @@ void X86EMU_exec(void) DB(x86emu_end_instr();) for (;;) { -DB( if (CHECK_IP_FETCH()) - x86emu_check_ip_access();) - /* If debugging, save the IP and CS values. */ - SAVE_IP_CS(M.x86.R_CS, M.x86.R_IP); - INC_DECODED_INST_LEN(1); - if (M.x86.intr) { - if (M.x86.intr & INTR_HALTED) { -DB( if (M.x86.R_SP != 0) { - printk("halted\n"); - X86EMU_trace_regs(); - } - else { - if (M.x86.debug) - printk("Service completed successfully\n"); - }) - return; - } - if (((M.x86.intr & INTR_SYNCH) && (M.x86.intno == 0 || M.x86.intno == 2)) || - !ACCESS_FLAG(F_IF)) { - x86emu_intr_handle(); - } - } - op1 = (*sys_rdb)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP++)); - (*x86emu_optab[op1])(op1); - if (M.x86.debug & DEBUG_EXIT) { - M.x86.debug &= ~DEBUG_EXIT; - return; - } +DB( if (CHECK_IP_FETCH()) + x86emu_check_ip_access();) + /* If debugging, save the IP and CS values. */ + SAVE_IP_CS(M.x86.R_CS, M.x86.R_IP); + INC_DECODED_INST_LEN(1); + if (M.x86.intr) { + if (M.x86.intr & INTR_HALTED) { +DB( if (M.x86.R_SP != 0) { + printk("halted\n"); + X86EMU_trace_regs(); + } + else { + if (M.x86.debug) + printk("Service completed successfully\n"); + }) + return; + } + if (((M.x86.intr & INTR_SYNCH) && (M.x86.intno == 0 || M.x86.intno == 2)) || + !ACCESS_FLAG(F_IF)) { + x86emu_intr_handle(); + } + } + op1 = (*sys_rdb)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP++)); + (*x86emu_optab[op1])(op1); + if (M.x86.debug & DEBUG_EXIT) { + M.x86.debug &= ~DEBUG_EXIT; + return; + } } } @@ -137,9 +137,9 @@ void X86EMU_halt_sys(void) /**************************************************************************** PARAMETERS: -mod - Mod value from decoded byte -regh - Reg h value from decoded byte -regl - Reg l value from decoded byte +mod - Mod value from decoded byte +regh - Reg h value from decoded byte +regl - Reg l value from decoded byte REMARKS: Raise the specified interrupt to be handled before the execution of the @@ -155,7 +155,7 @@ void fetch_decode_modrm( int fetched; DB( if (CHECK_IP_FETCH()) - x86emu_check_ip_access();) + x86emu_check_ip_access();) fetched = (*sys_rdb)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP++)); INC_DECODED_INST_LEN(1); *mod = (fetched >> 6) & 0x03; @@ -178,7 +178,7 @@ u8 fetch_byte_imm(void) u8 fetched; DB( if (CHECK_IP_FETCH()) - x86emu_check_ip_access();) + x86emu_check_ip_access();) fetched = (*sys_rdb)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP++)); INC_DECODED_INST_LEN(1); return fetched; @@ -199,7 +199,7 @@ u16 fetch_word_imm(void) u16 fetched; DB( if (CHECK_IP_FETCH()) - x86emu_check_ip_access();) + x86emu_check_ip_access();) fetched = (*sys_rdw)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP)); M.x86.R_IP += 2; INC_DECODED_INST_LEN(2); @@ -221,7 +221,7 @@ u32 fetch_long_imm(void) u32 fetched; DB( if (CHECK_IP_FETCH()) - x86emu_check_ip_access();) + x86emu_check_ip_access();) fetched = (*sys_rdl)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP)); M.x86.R_IP += 4; INC_DECODED_INST_LEN(4); @@ -261,39 +261,39 @@ _INLINE u32 get_data_segment(void) { #define GET_SEGMENT(segment) switch (M.x86.mode & SYSMODE_SEGMASK) { - case 0: /* default case: use ds register */ + case 0: /* default case: use ds register */ case SYSMODE_SEGOVR_DS: case SYSMODE_SEGOVR_DS | SYSMODE_SEG_DS_SS: - return M.x86.R_DS; - case SYSMODE_SEG_DS_SS: /* non-overridden, use ss register */ - return M.x86.R_SS; + return M.x86.R_DS; + case SYSMODE_SEG_DS_SS: /* non-overridden, use ss register */ + return M.x86.R_SS; case SYSMODE_SEGOVR_CS: case SYSMODE_SEGOVR_CS | SYSMODE_SEG_DS_SS: - return M.x86.R_CS; + return M.x86.R_CS; case SYSMODE_SEGOVR_ES: case SYSMODE_SEGOVR_ES | SYSMODE_SEG_DS_SS: - return M.x86.R_ES; + return M.x86.R_ES; case SYSMODE_SEGOVR_FS: case SYSMODE_SEGOVR_FS | SYSMODE_SEG_DS_SS: - return M.x86.R_FS; + return M.x86.R_FS; case SYSMODE_SEGOVR_GS: case SYSMODE_SEGOVR_GS | SYSMODE_SEG_DS_SS: - return M.x86.R_GS; + return M.x86.R_GS; case SYSMODE_SEGOVR_SS: case SYSMODE_SEGOVR_SS | SYSMODE_SEG_DS_SS: - return M.x86.R_SS; + return M.x86.R_SS; default: -#ifdef DEBUG - printk("error: should not happen: multiple overrides.\n"); +#ifdef DEBUG + printk("error: should not happen: multiple overrides.\n"); #endif - HALT_SYS(); - return 0; + HALT_SYS(); + return 0; } } /**************************************************************************** PARAMETERS: -offset - Offset to load data from +offset - Offset to load data from RETURNS: Byte value read from the absolute memory location. @@ -305,14 +305,14 @@ u8 fetch_data_byte( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif return (*sys_rdb)((get_data_segment() << 4) + offset); } /**************************************************************************** PARAMETERS: -offset - Offset to load data from +offset - Offset to load data from RETURNS: Word value read from the absolute memory location. @@ -324,14 +324,14 @@ u16 fetch_data_word( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif return (*sys_rdw)((get_data_segment() << 4) + offset); } /**************************************************************************** PARAMETERS: -offset - Offset to load data from +offset - Offset to load data from RETURNS: Long value read from the absolute memory location. @@ -343,7 +343,7 @@ u32 fetch_data_long( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif return (*sys_rdl)((get_data_segment() << 4) + offset); } @@ -351,7 +351,7 @@ u32 fetch_data_long( /**************************************************************************** PARAMETERS: segment - Segment to load data from -offset - Offset to load data from +offset - Offset to load data from RETURNS: Byte value read from the absolute memory location. @@ -364,7 +364,7 @@ u8 fetch_data_byte_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif return (*sys_rdb)(((u32)segment << 4) + offset); } @@ -372,7 +372,7 @@ u8 fetch_data_byte_abs( /**************************************************************************** PARAMETERS: segment - Segment to load data from -offset - Offset to load data from +offset - Offset to load data from RETURNS: Word value read from the absolute memory location. @@ -385,7 +385,7 @@ u16 fetch_data_word_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif return (*sys_rdw)(((u32)segment << 4) + offset); } @@ -393,7 +393,7 @@ u16 fetch_data_word_abs( /**************************************************************************** PARAMETERS: segment - Segment to load data from -offset - Offset to load data from +offset - Offset to load data from RETURNS: Long value read from the absolute memory location. @@ -406,15 +406,15 @@ u32 fetch_data_long_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif return (*sys_rdl)(((u32)segment << 4) + offset); } /**************************************************************************** PARAMETERS: -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a word value to an segmented memory location. The segment used is @@ -428,15 +428,15 @@ void store_data_byte( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif (*sys_wrb)((get_data_segment() << 4) + offset, val); } /**************************************************************************** PARAMETERS: -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a word value to an segmented memory location. The segment used is @@ -450,15 +450,15 @@ void store_data_word( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif (*sys_wrw)((get_data_segment() << 4) + offset, val); } /**************************************************************************** PARAMETERS: -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a long value to an segmented memory location. The segment used is @@ -472,7 +472,7 @@ void store_data_long( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access((u16)get_data_segment(), offset); + x86emu_check_data_access((u16)get_data_segment(), offset); #endif (*sys_wrl)((get_data_segment() << 4) + offset, val); } @@ -480,8 +480,8 @@ void store_data_long( /**************************************************************************** PARAMETERS: segment - Segment to store data at -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a byte value to an absolute memory location. @@ -495,7 +495,7 @@ void store_data_byte_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif (*sys_wrb)(((u32)segment << 4) + offset, val); } @@ -503,8 +503,8 @@ void store_data_byte_abs( /**************************************************************************** PARAMETERS: segment - Segment to store data at -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a word value to an absolute memory location. @@ -518,7 +518,7 @@ void store_data_word_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif (*sys_wrw)(((u32)segment << 4) + offset, val); } @@ -526,8 +526,8 @@ void store_data_word_abs( /**************************************************************************** PARAMETERS: segment - Segment to store data at -offset - Offset to store data at -val - Value to store +offset - Offset to store data at +val - Value to store REMARKS: Writes a long value to an absolute memory location. @@ -541,7 +541,7 @@ void store_data_long_abs( { #ifdef DEBUG if (CHECK_DATA_ACCESS()) - x86emu_check_data_access(segment, offset); + x86emu_check_data_access(segment, offset); #endif (*sys_wrl)(((u32)segment << 4) + offset, val); } @@ -562,32 +562,32 @@ u8* decode_rm_byte_register( { switch (reg) { case 0: - DECODE_PRINTF("AL"); - return &M.x86.R_AL; + DECODE_PRINTF("AL"); + return &M.x86.R_AL; case 1: - DECODE_PRINTF("CL"); - return &M.x86.R_CL; + DECODE_PRINTF("CL"); + return &M.x86.R_CL; case 2: - DECODE_PRINTF("DL"); - return &M.x86.R_DL; + DECODE_PRINTF("DL"); + return &M.x86.R_DL; case 3: - DECODE_PRINTF("BL"); - return &M.x86.R_BL; + DECODE_PRINTF("BL"); + return &M.x86.R_BL; case 4: - DECODE_PRINTF("AH"); - return &M.x86.R_AH; + DECODE_PRINTF("AH"); + return &M.x86.R_AH; case 5: - DECODE_PRINTF("CH"); - return &M.x86.R_CH; + DECODE_PRINTF("CH"); + return &M.x86.R_CH; case 6: - DECODE_PRINTF("DH"); - return &M.x86.R_DH; + DECODE_PRINTF("DH"); + return &M.x86.R_DH; case 7: - DECODE_PRINTF("BH"); - return &M.x86.R_BH; + DECODE_PRINTF("BH"); + return &M.x86.R_BH; } HALT_SYS(); - return NULL; /* NOT REACHED OR REACHED ON ERROR */ + return NULL; /* NOT REACHED OR REACHED ON ERROR */ } /**************************************************************************** @@ -599,39 +599,39 @@ Pointer to the appropriate register REMARKS: Return a pointer to the register given by the R/RM field of the -modrm byte, for word operands. Also enables the decoding of instructions. +modrm byte, for word operands. Also enables the decoding of instructions. ****************************************************************************/ u16* decode_rm_word_register( int reg) { switch (reg) { case 0: - DECODE_PRINTF("AX"); - return &M.x86.R_AX; + DECODE_PRINTF("AX"); + return &M.x86.R_AX; case 1: - DECODE_PRINTF("CX"); - return &M.x86.R_CX; + DECODE_PRINTF("CX"); + return &M.x86.R_CX; case 2: - DECODE_PRINTF("DX"); - return &M.x86.R_DX; + DECODE_PRINTF("DX"); + return &M.x86.R_DX; case 3: - DECODE_PRINTF("BX"); - return &M.x86.R_BX; + DECODE_PRINTF("BX"); + return &M.x86.R_BX; case 4: - DECODE_PRINTF("SP"); - return &M.x86.R_SP; + DECODE_PRINTF("SP"); + return &M.x86.R_SP; case 5: - DECODE_PRINTF("BP"); - return &M.x86.R_BP; + DECODE_PRINTF("BP"); + return &M.x86.R_BP; case 6: - DECODE_PRINTF("SI"); - return &M.x86.R_SI; + DECODE_PRINTF("SI"); + return &M.x86.R_SI; case 7: - DECODE_PRINTF("DI"); - return &M.x86.R_DI; + DECODE_PRINTF("DI"); + return &M.x86.R_DI; } HALT_SYS(); - return NULL; /* NOTREACHED OR REACHED ON ERROR */ + return NULL; /* NOTREACHED OR REACHED ON ERROR */ } /**************************************************************************** @@ -643,39 +643,39 @@ Pointer to the appropriate register REMARKS: Return a pointer to the register given by the R/RM field of the -modrm byte, for dword operands. Also enables the decoding of instructions. +modrm byte, for dword operands. Also enables the decoding of instructions. ****************************************************************************/ u32* decode_rm_long_register( int reg) { switch (reg) { case 0: - DECODE_PRINTF("EAX"); - return &M.x86.R_EAX; + DECODE_PRINTF("EAX"); + return &M.x86.R_EAX; case 1: - DECODE_PRINTF("ECX"); - return &M.x86.R_ECX; + DECODE_PRINTF("ECX"); + return &M.x86.R_ECX; case 2: - DECODE_PRINTF("EDX"); - return &M.x86.R_EDX; + DECODE_PRINTF("EDX"); + return &M.x86.R_EDX; case 3: - DECODE_PRINTF("EBX"); - return &M.x86.R_EBX; + DECODE_PRINTF("EBX"); + return &M.x86.R_EBX; case 4: - DECODE_PRINTF("ESP"); - return &M.x86.R_ESP; + DECODE_PRINTF("ESP"); + return &M.x86.R_ESP; case 5: - DECODE_PRINTF("EBP"); - return &M.x86.R_EBP; + DECODE_PRINTF("EBP"); + return &M.x86.R_EBP; case 6: - DECODE_PRINTF("ESI"); - return &M.x86.R_ESI; + DECODE_PRINTF("ESI"); + return &M.x86.R_ESI; case 7: - DECODE_PRINTF("EDI"); - return &M.x86.R_EDI; + DECODE_PRINTF("EDI"); + return &M.x86.R_EDI; } HALT_SYS(); - return NULL; /* NOTREACHED OR REACHED ON ERROR */ + return NULL; /* NOTREACHED OR REACHED ON ERROR */ } /**************************************************************************** @@ -695,30 +695,30 @@ u16* decode_rm_seg_register( { switch (reg) { case 0: - DECODE_PRINTF("ES"); - return &M.x86.R_ES; + DECODE_PRINTF("ES"); + return &M.x86.R_ES; case 1: - DECODE_PRINTF("CS"); - return &M.x86.R_CS; + DECODE_PRINTF("CS"); + return &M.x86.R_CS; case 2: - DECODE_PRINTF("SS"); - return &M.x86.R_SS; + DECODE_PRINTF("SS"); + return &M.x86.R_SS; case 3: - DECODE_PRINTF("DS"); - return &M.x86.R_DS; + DECODE_PRINTF("DS"); + return &M.x86.R_DS; case 4: - DECODE_PRINTF("FS"); - return &M.x86.R_FS; + DECODE_PRINTF("FS"); + return &M.x86.R_FS; case 5: - DECODE_PRINTF("GS"); - return &M.x86.R_GS; + DECODE_PRINTF("GS"); + return &M.x86.R_GS; case 6: case 7: - DECODE_PRINTF("ILLEGAL SEGREG"); - break; + DECODE_PRINTF("ILLEGAL SEGREG"); + break; } HALT_SYS(); - return NULL; /* NOT REACHED OR REACHED ON ERROR */ + return NULL; /* NOT REACHED OR REACHED ON ERROR */ } /**************************************************************************** @@ -739,38 +739,38 @@ unsigned decode_sib_si( { scale = 1 << scale; if (scale > 1) { - DECODE_PRINTF2("[%d*", scale); + DECODE_PRINTF2("[%d*", scale); } else { - DECODE_PRINTF("["); + DECODE_PRINTF("["); } switch (index) { case 0: - DECODE_PRINTF("EAX]"); - return M.x86.R_EAX * index; + DECODE_PRINTF("EAX]"); + return M.x86.R_EAX * index; case 1: - DECODE_PRINTF("ECX]"); - return M.x86.R_ECX * index; + DECODE_PRINTF("ECX]"); + return M.x86.R_ECX * index; case 2: - DECODE_PRINTF("EDX]"); - return M.x86.R_EDX * index; + DECODE_PRINTF("EDX]"); + return M.x86.R_EDX * index; case 3: - DECODE_PRINTF("EBX]"); - return M.x86.R_EBX * index; + DECODE_PRINTF("EBX]"); + return M.x86.R_EBX * index; case 4: - DECODE_PRINTF("0]"); - return 0; + DECODE_PRINTF("0]"); + return 0; case 5: - DECODE_PRINTF("EBP]"); - return M.x86.R_EBP * index; + DECODE_PRINTF("EBP]"); + return M.x86.R_EBP * index; case 6: - DECODE_PRINTF("ESI]"); - return M.x86.R_ESI * index; + DECODE_PRINTF("ESI]"); + return M.x86.R_ESI * index; case 7: - DECODE_PRINTF("EDI]"); - return M.x86.R_EDI * index; + DECODE_PRINTF("EDI]"); + return M.x86.R_EDI * index; } HALT_SYS(); - return 0; /* NOT REACHED OR REACHED ON ERROR */ + return 0; /* NOT REACHED OR REACHED ON ERROR */ } /**************************************************************************** @@ -795,58 +795,58 @@ unsigned decode_sib_address( switch (base) { case 0: - DECODE_PRINTF("[EAX]"); - offset = M.x86.R_EAX; - break; + DECODE_PRINTF("[EAX]"); + offset = M.x86.R_EAX; + break; case 1: - DECODE_PRINTF("[ECX]"); - offset = M.x86.R_ECX; - break; + DECODE_PRINTF("[ECX]"); + offset = M.x86.R_ECX; + break; case 2: - DECODE_PRINTF("[EDX]"); - offset = M.x86.R_EDX; - break; + DECODE_PRINTF("[EDX]"); + offset = M.x86.R_EDX; + break; case 3: - DECODE_PRINTF("[EBX]"); - offset = M.x86.R_EBX; - break; + DECODE_PRINTF("[EBX]"); + offset = M.x86.R_EBX; + break; case 4: - DECODE_PRINTF("[ESP]"); - offset = M.x86.R_ESP; - break; + DECODE_PRINTF("[ESP]"); + offset = M.x86.R_ESP; + break; case 5: - switch (mod) { - case 0: - displacement = (s32)fetch_long_imm(); - DECODE_PRINTF2("[%d]", displacement); - offset = displacement; - break; - case 1: - displacement = (s8)fetch_byte_imm(); - DECODE_PRINTF2("[%d][EBP]", displacement); - offset = M.x86.R_EBP + displacement; - break; - case 2: - displacement = (s32)fetch_long_imm(); - DECODE_PRINTF2("[%d][EBP]", displacement); - offset = M.x86.R_EBP + displacement; - break; - default: - HALT_SYS(); - } - DECODE_PRINTF("[EAX]"); - offset = M.x86.R_EAX; - break; + switch (mod) { + case 0: + displacement = (s32)fetch_long_imm(); + DECODE_PRINTF2("[%d]", displacement); + offset = displacement; + break; + case 1: + displacement = (s8)fetch_byte_imm(); + DECODE_PRINTF2("[%d][EBP]", displacement); + offset = M.x86.R_EBP + displacement; + break; + case 2: + displacement = (s32)fetch_long_imm(); + DECODE_PRINTF2("[%d][EBP]", displacement); + offset = M.x86.R_EBP + displacement; + break; + default: + HALT_SYS(); + } + DECODE_PRINTF("[EAX]"); + offset = M.x86.R_EAX; + break; case 6: - DECODE_PRINTF("[ESI]"); - offset = M.x86.R_ESI; - break; + DECODE_PRINTF("[ESI]"); + offset = M.x86.R_ESI; + break; case 7: - DECODE_PRINTF("[EDI]"); - offset = M.x86.R_EDI; - break; + DECODE_PRINTF("[EDI]"); + offset = M.x86.R_EDI; + break; default: - HALT_SYS(); + HALT_SYS(); } offset += decode_sib_si(ss, index); return offset; @@ -864,14 +864,14 @@ REMARKS: Return the offset given by mod=00 addressing. Also enables the decoding of instructions. -NOTE: The code which specifies the corresponding segment (ds vs ss) - below in the case of [BP+..]. The assumption here is that at the - point that this subroutine is called, the bit corresponding to - SYSMODE_SEG_DS_SS will be zero. After every instruction - except the segment override instructions, this bit (as well - as any bits indicating segment overrides) will be clear. So - if a SS access is needed, set this bit. Otherwise, DS access - occurs (unless any of the segment override bits are set). +NOTE: The code which specifies the corresponding segment (ds vs ss) + below in the case of [BP+..]. The assumption here is that at the + point that this subroutine is called, the bit corresponding to + SYSMODE_SEG_DS_SS will be zero. After every instruction + except the segment override instructions, this bit (as well + as any bits indicating segment overrides) will be clear. So + if a SS access is needed, set this bit. Otherwise, DS access + occurs (unless any of the segment override bits are set). ****************************************************************************/ unsigned decode_rm00_address( int rm) @@ -879,64 +879,64 @@ unsigned decode_rm00_address( unsigned offset; if (M.x86.mode & SYSMODE_PREFIX_ADDR) { - /* 32-bit addressing */ - switch (rm) { - case 0: - DECODE_PRINTF("[EAX]"); - return M.x86.R_EAX; - case 1: - DECODE_PRINTF("[ECX]"); - return M.x86.R_ECX; - case 2: - DECODE_PRINTF("[EDX]"); - return M.x86.R_EDX; - case 3: - DECODE_PRINTF("[EBX]"); - return M.x86.R_EBX; - case 4: - return decode_sib_address(0); - case 5: - offset = fetch_long_imm(); - DECODE_PRINTF2("[%08x]", offset); - return offset; - case 6: - DECODE_PRINTF("[ESI]"); - return M.x86.R_ESI; - case 7: - DECODE_PRINTF("[EDI]"); - return M.x86.R_EDI; - } + /* 32-bit addressing */ + switch (rm) { + case 0: + DECODE_PRINTF("[EAX]"); + return M.x86.R_EAX; + case 1: + DECODE_PRINTF("[ECX]"); + return M.x86.R_ECX; + case 2: + DECODE_PRINTF("[EDX]"); + return M.x86.R_EDX; + case 3: + DECODE_PRINTF("[EBX]"); + return M.x86.R_EBX; + case 4: + return decode_sib_address(0); + case 5: + offset = fetch_long_imm(); + DECODE_PRINTF2("[%08x]", offset); + return offset; + case 6: + DECODE_PRINTF("[ESI]"); + return M.x86.R_ESI; + case 7: + DECODE_PRINTF("[EDI]"); + return M.x86.R_EDI; + } } else { - /* 16-bit addressing */ - switch (rm) { - case 0: - DECODE_PRINTF("[BX+SI]"); - return (M.x86.R_BX + M.x86.R_SI) & 0xffff; - case 1: - DECODE_PRINTF("[BX+DI]"); - return (M.x86.R_BX + M.x86.R_DI) & 0xffff; - case 2: - DECODE_PRINTF("[BP+SI]"); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_SI) & 0xffff; - case 3: - DECODE_PRINTF("[BP+DI]"); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_DI) & 0xffff; - case 4: - DECODE_PRINTF("[SI]"); - return M.x86.R_SI; - case 5: - DECODE_PRINTF("[DI]"); - return M.x86.R_DI; - case 6: - offset = fetch_word_imm(); - DECODE_PRINTF2("[%04x]", offset); - return offset; - case 7: - DECODE_PRINTF("[BX]"); - return M.x86.R_BX; - } + /* 16-bit addressing */ + switch (rm) { + case 0: + DECODE_PRINTF("[BX+SI]"); + return (M.x86.R_BX + M.x86.R_SI) & 0xffff; + case 1: + DECODE_PRINTF("[BX+DI]"); + return (M.x86.R_BX + M.x86.R_DI) & 0xffff; + case 2: + DECODE_PRINTF("[BP+SI]"); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_SI) & 0xffff; + case 3: + DECODE_PRINTF("[BP+DI]"); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_DI) & 0xffff; + case 4: + DECODE_PRINTF("[SI]"); + return M.x86.R_SI; + case 5: + DECODE_PRINTF("[DI]"); + return M.x86.R_DI; + case 6: + offset = fetch_word_imm(); + DECODE_PRINTF2("[%04x]", offset); + return offset; + case 7: + DECODE_PRINTF("[BX]"); + return M.x86.R_BX; + } } HALT_SYS(); return 0; @@ -959,76 +959,76 @@ unsigned decode_rm01_address( int displacement; if (M.x86.mode & SYSMODE_PREFIX_ADDR) { - /* 32-bit addressing */ - if (rm != 4) - displacement = (s8)fetch_byte_imm(); - else - displacement = 0; - - switch (rm) { - case 0: - DECODE_PRINTF2("%d[EAX]", displacement); - return M.x86.R_EAX + displacement; - case 1: - DECODE_PRINTF2("%d[ECX]", displacement); - return M.x86.R_ECX + displacement; - case 2: - DECODE_PRINTF2("%d[EDX]", displacement); - return M.x86.R_EDX + displacement; - case 3: - DECODE_PRINTF2("%d[EBX]", displacement); - return M.x86.R_EBX + displacement; - case 4: { - int offset = decode_sib_address(1); - displacement = (s8)fetch_byte_imm(); - DECODE_PRINTF2("[%d]", displacement); - return offset + displacement; - } - case 5: - DECODE_PRINTF2("%d[EBP]", displacement); - return M.x86.R_EBP + displacement; - case 6: - DECODE_PRINTF2("%d[ESI]", displacement); - return M.x86.R_ESI + displacement; - case 7: - DECODE_PRINTF2("%d[EDI]", displacement); - return M.x86.R_EDI + displacement; - } + /* 32-bit addressing */ + if (rm != 4) + displacement = (s8)fetch_byte_imm(); + else + displacement = 0; + + switch (rm) { + case 0: + DECODE_PRINTF2("%d[EAX]", displacement); + return M.x86.R_EAX + displacement; + case 1: + DECODE_PRINTF2("%d[ECX]", displacement); + return M.x86.R_ECX + displacement; + case 2: + DECODE_PRINTF2("%d[EDX]", displacement); + return M.x86.R_EDX + displacement; + case 3: + DECODE_PRINTF2("%d[EBX]", displacement); + return M.x86.R_EBX + displacement; + case 4: { + int offset = decode_sib_address(1); + displacement = (s8)fetch_byte_imm(); + DECODE_PRINTF2("[%d]", displacement); + return offset + displacement; + } + case 5: + DECODE_PRINTF2("%d[EBP]", displacement); + return M.x86.R_EBP + displacement; + case 6: + DECODE_PRINTF2("%d[ESI]", displacement); + return M.x86.R_ESI + displacement; + case 7: + DECODE_PRINTF2("%d[EDI]", displacement); + return M.x86.R_EDI + displacement; + } } else { - /* 16-bit addressing */ - displacement = (s8)fetch_byte_imm(); - switch (rm) { - case 0: - DECODE_PRINTF2("%d[BX+SI]", displacement); - return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; - case 1: - DECODE_PRINTF2("%d[BX+DI]", displacement); - return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; - case 2: - DECODE_PRINTF2("%d[BP+SI]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; - case 3: - DECODE_PRINTF2("%d[BP+DI]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; - case 4: - DECODE_PRINTF2("%d[SI]", displacement); - return (M.x86.R_SI + displacement) & 0xffff; - case 5: - DECODE_PRINTF2("%d[DI]", displacement); - return (M.x86.R_DI + displacement) & 0xffff; - case 6: - DECODE_PRINTF2("%d[BP]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + displacement) & 0xffff; - case 7: - DECODE_PRINTF2("%d[BX]", displacement); - return (M.x86.R_BX + displacement) & 0xffff; - } + /* 16-bit addressing */ + displacement = (s8)fetch_byte_imm(); + switch (rm) { + case 0: + DECODE_PRINTF2("%d[BX+SI]", displacement); + return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; + case 1: + DECODE_PRINTF2("%d[BX+DI]", displacement); + return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; + case 2: + DECODE_PRINTF2("%d[BP+SI]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; + case 3: + DECODE_PRINTF2("%d[BP+DI]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; + case 4: + DECODE_PRINTF2("%d[SI]", displacement); + return (M.x86.R_SI + displacement) & 0xffff; + case 5: + DECODE_PRINTF2("%d[DI]", displacement); + return (M.x86.R_DI + displacement) & 0xffff; + case 6: + DECODE_PRINTF2("%d[BP]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + displacement) & 0xffff; + case 7: + DECODE_PRINTF2("%d[BX]", displacement); + return (M.x86.R_BX + displacement) & 0xffff; + } } HALT_SYS(); - return 0; /* SHOULD NOT HAPPEN */ + return 0; /* SHOULD NOT HAPPEN */ } /**************************************************************************** @@ -1046,82 +1046,81 @@ unsigned decode_rm10_address( int rm) { if (M.x86.mode & SYSMODE_PREFIX_ADDR) { - int displacement; - - /* 32-bit addressing */ - if (rm != 4) - displacement = (s32)fetch_long_imm(); - else - displacement = 0; - - switch (rm) { - case 0: - DECODE_PRINTF2("%d[EAX]", displacement); - return M.x86.R_EAX + displacement; - case 1: - DECODE_PRINTF2("%d[ECX]", displacement); - return M.x86.R_ECX + displacement; - case 2: - DECODE_PRINTF2("%d[EDX]", displacement); - return M.x86.R_EDX + displacement; - case 3: - DECODE_PRINTF2("%d[EBX]", displacement); - return M.x86.R_EBX + displacement; - case 4: { - int offset = decode_sib_address(2); - displacement = (s32)fetch_long_imm(); - DECODE_PRINTF2("[%d]", displacement); - return offset + displacement; - } - case 5: - DECODE_PRINTF2("%d[EBP]", displacement); - return M.x86.R_EBP + displacement; - case 6: - DECODE_PRINTF2("%d[ESI]", displacement); - return M.x86.R_ESI + displacement; - case 7: - DECODE_PRINTF2("%d[EDI]", displacement); - return M.x86.R_EDI + displacement; - } + int displacement; + + /* 32-bit addressing */ + if (rm != 4) + displacement = (s32)fetch_long_imm(); + else + displacement = 0; + + switch (rm) { + case 0: + DECODE_PRINTF2("%d[EAX]", displacement); + return M.x86.R_EAX + displacement; + case 1: + DECODE_PRINTF2("%d[ECX]", displacement); + return M.x86.R_ECX + displacement; + case 2: + DECODE_PRINTF2("%d[EDX]", displacement); + return M.x86.R_EDX + displacement; + case 3: + DECODE_PRINTF2("%d[EBX]", displacement); + return M.x86.R_EBX + displacement; + case 4: { + int offset = decode_sib_address(2); + displacement = (s32)fetch_long_imm(); + DECODE_PRINTF2("[%d]", displacement); + return offset + displacement; + } + case 5: + DECODE_PRINTF2("%d[EBP]", displacement); + return M.x86.R_EBP + displacement; + case 6: + DECODE_PRINTF2("%d[ESI]", displacement); + return M.x86.R_ESI + displacement; + case 7: + DECODE_PRINTF2("%d[EDI]", displacement); + return M.x86.R_EDI + displacement; + } } else { - int displacement = (s16)fetch_word_imm(); - - /* 16-bit addressing */ - switch (rm) { - case 0: - DECODE_PRINTF2("%d[BX+SI]", displacement); - return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; - case 1: - DECODE_PRINTF2("%d[BX+DI]", displacement); - return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; - case 2: - DECODE_PRINTF2("%d[BP+SI]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; - case 3: - DECODE_PRINTF2("%d[BP+DI]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; - case 4: - DECODE_PRINTF2("%d[SI]", displacement); - return (M.x86.R_SI + displacement) & 0xffff; - case 5: - DECODE_PRINTF2("%d[DI]", displacement); - return (M.x86.R_DI + displacement) & 0xffff; - case 6: - DECODE_PRINTF2("%d[BP]", displacement); - M.x86.mode |= SYSMODE_SEG_DS_SS; - return (M.x86.R_BP + displacement) & 0xffff; - case 7: - DECODE_PRINTF2("%d[BX]", displacement); - return (M.x86.R_BX + displacement) & 0xffff; - } + int displacement = (s16)fetch_word_imm(); + + /* 16-bit addressing */ + switch (rm) { + case 0: + DECODE_PRINTF2("%d[BX+SI]", displacement); + return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; + case 1: + DECODE_PRINTF2("%d[BX+DI]", displacement); + return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; + case 2: + DECODE_PRINTF2("%d[BP+SI]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; + case 3: + DECODE_PRINTF2("%d[BP+DI]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; + case 4: + DECODE_PRINTF2("%d[SI]", displacement); + return (M.x86.R_SI + displacement) & 0xffff; + case 5: + DECODE_PRINTF2("%d[DI]", displacement); + return (M.x86.R_DI + displacement) & 0xffff; + case 6: + DECODE_PRINTF2("%d[BP]", displacement); + M.x86.mode |= SYSMODE_SEG_DS_SS; + return (M.x86.R_BP + displacement) & 0xffff; + case 7: + DECODE_PRINTF2("%d[BX]", displacement); + return (M.x86.R_BX + displacement) & 0xffff; + } } HALT_SYS(); - return 0; /* SHOULD NOT HAPPEN */ + return 0; /* SHOULD NOT HAPPEN */ } - /**************************************************************************** PARAMETERS: mod - modifier @@ -1143,6 +1142,3 @@ unsigned decode_rmXX_address(int mod, int rm) return decode_rm01_address(rm); return decode_rm10_address(rm); } - - - |