/****************************************************************************
*
-* 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
*
* ========================================================================
*
* 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.
*
*
* ========================================================================
*
-* 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.
*
****************************************************************************/
#include "x86emu/x86emui.h"
+#if defined(CONFIG_BIOSEMU)
+
/*----------------------------- Implementation ----------------------------*/
/****************************************************************************
****************************************************************************/
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;
+ }
}
}
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;
+ }
}
}
/****************************************************************************
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
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;
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;
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);
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);
{
#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.
{
#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.
{
#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.
{
#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);
}
/****************************************************************************
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.
{
#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);
}
/****************************************************************************
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.
{
#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);
}
/****************************************************************************
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.
{
#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
{
#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
{
#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
{
#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);
}
/****************************************************************************
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.
{
#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);
}
/****************************************************************************
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.
{
#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);
}
/****************************************************************************
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.
{
#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);
}
{
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 */
}
/****************************************************************************
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 */
}
/****************************************************************************
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 */
}
/****************************************************************************
{
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 */
}
/****************************************************************************
{
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 */
}
/****************************************************************************
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;
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)
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;
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 */
}
/****************************************************************************
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
return decode_rm10_address(rm);
}
-
-
+#endif
projects / oweals / u-boot.git / blobdiff