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x86utm.cpp
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x86utm.cpp
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/***
All output functions for lines of x86 code
Machine_Code_Out
Disassembled_line_out
Disassembled_line_out
Disassembled_line_source_out
Disassembled_line_out2
***/
//
// Source code for the x86utm operating system.
// Copyright PL Olcott 2020, 2021, 2022
// based on libx86emu: x86emu-demo.c
// https://github.com/wfeldt/libx86emu
//
#define TRACE_USER_CODE_ONLY
#define LOCAL_HALT_DECIDER_MODE
#define MAX_INSTRUCTIONS 20000000 // 10,000,000
//#define MAX_INSTRUCTIONS 100 // 10,000,000
//#define DOT_DASH_PREFIX
#ifndef LOCAL_HALT_DECIDER_MODE
#define GLOBAL_HALT_DECIDER_MODE
#endif
//#define DEBUG_FUNCTION_CALLS
#define HEAP_SIZE 0x1000000 // 16 MB // 2021-04-22 Increased to 16 MB
#define STACK_SIZE 0x100000 // 1 MB // 2021-04-22 Increased to 1 MB
#define NOP_OPCODE 0x90
#define INT_3 0xCC
// The INT3 instruction is a one-byte-instruction defined for use by
// debuggers to temporarily replace an instruction in a running program
// in order to set a code breakpoint. The opcode for INT3 is 0xCC.
#define ZEROES 0x00
#define HALT 0xF4
#define RETURN 0xC3
#define SPACE 0x20
#define FILL_VALUE NOP_OPCODE
// NOP, no-op, or NOOP (pronounced "no op"; short for no operation)
// is a machine language instruction and its assembly language mnemonic,
// programming language statement, or computer protocol command that
// does nothing.
#define MAX_MACHINE_CODE_BYTES 7 // was 5 or 8
#define NOP_OPCODE 0x90
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <vector>
#include "include/Read_COFF_Object.h"
#include "include/x86emu.h"
#if (_MSC_VER >= 1900) // (Visual Studio 2015 version 14.0)
#include "include/getopt.h"
#else
#include <getopt.h>
#endif
struct X86_UTM;
void Execute_Instruction(x86emu_t *emu, unsigned flags,
X86_UTM& x86utm, COFF_Reader& Reader);
u32 Allocate(x86emu_t *emu, u32 Heap_PTR_variable, u32 Heap_END_variable, u32 size);
const u32 EXECUTING = 0;
const u32 HALTED = 1;
const u32 ABORTED = 2;
void help(void);
void flush_log(x86emu_t *emu, char *buf, unsigned size);
x86emu_t *emu_new(void);
int emu_init(x86emu_t *emu, char *file);
void emu_run(char *file);
// already defined in x86emu_int.h
#define MODE_HALTED ((emu)->x86.mode & _MODE_HALTED)
struct option option_list[] = {
{ "help", 0, NULL, 'h' }, // List this menu
//{ "load_begin", 1, NULL, 'l' }, // Offset in the file to begin loading
{ "code_begin", 1, NULL, 'b' }, // Offset in the file of Code Segment
{ "code_size", 1, NULL, 's' }, // Size of Code Segment
{ "code_run", 1, NULL, 'r' }, // Offset in the file to Begin Executing
{ "max", 1, NULL, 'm' }, // Maximum number of instructions to execute
{ 0,0,0,0 } // ISO C forbids empty initializer braces
};
struct Command_Line_Options { // gcc C++ requires a name
//unsigned load_begin;
unsigned code_begin; // Code segment begin address
unsigned code_size; // Code segment size
unsigned code_run; //
unsigned max_instructions;
char *file;
} options;
//
// Difference between Windows and Linux internal naming conventions
//
//#ifdef _WIN32
/***
#define MAIN_NAME "_main" // 2022-08-14
#define CODE_SEGMENT_NAME ".text$mn" // 2022-08-14
#define Heap_PTR_NAME "_Heap_PTR" // 2022-08-14
#define Heap_END_NAME "_Heap_END" // 2022-08-14
***/
//#define Global_Execution_Trace_List_Index_NAME "_Global_Execution_Trace_List_Index"
//#define Global_Execution_Trace_List_NAME "_Global_Execution_Trace_List"
//#define Local_Halt_Decider_Mode_NAME "_Local_Halt_Decider_Mode"
//#define Current_Emulation_Level_NAME "_Current_Emulation_Level"
//#define Global_Abort_Flag_NAME "_Global_Abort_Flag"
//#define Debug_Trace_State_NAME "_debug_trace_state"
#define Halts_NAME "_Halts"
#define Output_Debug_Trace_NAME "_Output_Debug_Trace"
#define Decode_Line_Of_Code_NAME "_Decode_Line_Of_Code"
#define Output_Decoded_Instructions_NAME "_Output_Decoded_Instructions" // Made Obsolete
#define Copy_Code_NAME "_Copy_Code"
#define Identical_Code_NAME "_Identical_Code"
#define SaveState_NAME "_SaveState"
#define LoadState_NAME "_LoadState"
#define Allocate_NAME "_Allocate"
#define DebugStep_NAME "_DebugStep"
#define OutputString_NAME "_OutputString"
#define OutputHex_NAME "_OutputHex"
#define Output_NAME "_Output"
// New Virtual Machine Instructions
#define PushBack_NAME "_PushBack"
#define StackPush_NAME "_StackPush"
#define Output_Regs_NAME "_Output_Registers"
#define Global_Halts_NAME "_Global_Halts"
#define get_code_end_NAME "_get_code_end"
#define Last_Address_Of_OS_NAME "_Last_Address_Of_Operating_System"
#define Output_Saved_Regs_NAME "_Output_Saved_Registers"
#define Output_Stack_NAME "_Output_Stack"
#define Output_slave_stack_NAME "_Output_slave_stack"
#define Output_integer_list_NAME "_Output_integer_list" // Model for add new VMI
#define Output_Decoded_NAME "_Output_Decoded" // Model for add new VMI
//#define Simulate_NAME "_Simulate"
/***
#elif __linux__
#define MAIN_NAME "main"
#define CODE_SEGMENT_NAME ".text"
#define Heap_PTR_NAME "Heap_PTR"
#define Heap_END_NAME "Heap_END"
//#define Global_Execution_Trace_List_Index_NAME "Global_Execution_Trace_List_Index"
//#define Global_Execution_Trace_List_NAME "Global_Execution_Trace_List"
//#define Local_Halt_Decider_Mode_NAME "Local_Halt_Decider_Mode"
//#define Current_Emulation_Level_NAME "Current_Emulation_Level"
//#define Global_Abort_Flag_NAME "Global_Abort_Flag"
//#define Debug_Trace_State_NAME "debug_trace_state"
#define Halts_NAME "Halts"
#define Output_Debug_Trace_NAME "Output_Debug_Trace"
#define Copy_Code_NAME "Copy_Code"
#define Identical_Code_NAME "Identical_Code"
#define SaveState_NAME "SaveState"
#define LoadState_NAME "LoadState"
#define Allocate_NAME "Allocate"
#define DebugStep_NAME "DebugStep"
#define OutputString_NAME "OutputString"
#define OutputHex_NAME "OutputHex"
#define Output_NAME "Output"
// New Virtual Machine Instructions
#define PushBack_NAME "PushBack"
#define StackPush_NAME "StackPush"
#define Output_Regs_NAME "Output_Registers"
#define Global_Halts_NAME "Global_Halts"
#define get_code_end_NAME "get_code_end"
#define Last_Address_Of_OS_NAME "Last_Address_Of_Operating_System"
#define Output_Saved_Regs_NAME "Output_Saved_Registers"
#define Output_Stack_NAME "Output_Stack"
#define Output_slave_stack_NAME "Output_slave_stack"
#define Output_integer_list_NAME "Output_integer_list"
#define Decode_Line_Of_Code_NAME "Decode_Line_Of_Code"
#define Output_Decoded_Instructions_NAME "Output_Decoded_Instructions" // Made Obsolete
#define Output_Decoded_NAME "Output_Decoded" // Model for add new VMI
//#define Simulate_NAME "Simulate"
#endif
***/
//
// Determine if Function_Name is a Virtual Machine Instruction
//
bool Is_Virtual_Machine_Instruction(std::string Function_Name)
{
if (Function_Name == Copy_Code_NAME)
return true;
if (Function_Name == Identical_Code_NAME)
return true;
if (Function_Name == SaveState_NAME)
return true;
else if (Function_Name == LoadState_NAME)
return true;
else if (Function_Name == Allocate_NAME)
return true;
else if (Function_Name == DebugStep_NAME)
return true;
else if (Function_Name == Output_Debug_Trace_NAME)
return true;
else if (Function_Name == OutputString_NAME)
return true;
else if (Function_Name == OutputHex_NAME)
return true;
else if (Function_Name == Output_NAME)
return true;
else if (Function_Name == PushBack_NAME)
return true;
else if (Function_Name == StackPush_NAME)
return true;
else if (Function_Name == Output_Regs_NAME)
return true;
else if (Function_Name == Global_Halts_NAME)
return true;
else if (Function_Name == get_code_end_NAME)
return true;
else if (Function_Name == Last_Address_Of_OS_NAME) // 2021-08-26
return true; // 2021-08-26
else if (Function_Name == Output_Saved_Regs_NAME)
return true;
else if (Function_Name == Output_Stack_NAME)
return true;
else if (Function_Name == Output_slave_stack_NAME)
return true;
else if (Function_Name == Output_integer_list_NAME)
return true;
else if (Function_Name == Decode_Line_Of_Code_NAME)
return true;
else if (Function_Name == Output_Decoded_Instructions_NAME) // Made Obsolete
return true;
else if (Function_Name == Output_Decoded_NAME)
return true;
//else if (Function_Name == Simulate_NAME)
// return true;
return false;
}
/*
* Parse options, then run emulation.
*/
int main(int argc, char **argv)
{
int i;
char *str;
//options.max_instructions = 10000000;
opterr = 0;
while((i = getopt_long(argc, argv, "hb:s:r:m:", option_list, NULL)) != -1)
{
switch(i) {
// case 'l':
// options.load_begin = strtoul(optarg, NULL, 0);
// printf("--options.load_begin[%08x]\n", options.load_begin);
// break;
case 'b':
options.code_begin = strtoul(optarg, NULL, 0);
printf("--options.code_begin[%08x]\n", options.code_begin);
break;
case 's':
options.code_size = strtoul(optarg, &str, 0);
printf("--options.code_size.[%08x]\n", options.code_size);
break;
case 'r':
options.code_run = strtoul(optarg, NULL, 0);
printf("--options.code_run..[%08x]\n", options.code_run);
break;
case 'm':
options.max_instructions = strtoul(optarg, NULL, 0);
printf("options.max_instructions(%d)\n", options.max_instructions);
break;
default:
printf("default[%08x]\n", i);
help();
return i == 'h' ? 0 : 1;
}
}
if(argc == optind + 1) {
options.file = argv[optind];
}
else {
help();
return 1;
}
emu_run(options.file);
return 0;
}
/*
* Display short usage message.
*/
void help()
{
printf(
"Usage: x86emu-demo [OPTIONS] FILE\n"
"\n"
"Load FILE and run x86 emulation.\n"
"\n"
"Options:\n"
// " -l, --load ADDRESS Load FILE at ADDRESS into memory.\n"
" -b, --begin ADDRESS Address of beginning of code segment."
" (for disassembly listing)\n"
" -s, --size ADDRESS Size of code segment."
" (for disassembly listing)\n"
" -r, --run ADDRESS Start emulation at ADDRESS.\n"
" -m, --max N Stop after emulating N instructions.\n"
" -h, --help Show this text\n"
);
}
/*
* Write emulation log to console.
*/
void flush_log(x86emu_t *emu, char *buf, unsigned size)
{
if(!buf || !size) return;
fwrite(buf, size, 1, stdout);
}
/*
* Create new emulation object.
*/
x86emu_t *emu_new()
{
x86emu_t *emu = x86emu_new(X86EMU_PERM_R | X86EMU_PERM_W | X86EMU_PERM_X, 0);
/* log buf size of 1000000 is purely arbitrary */
x86emu_set_log(emu, 1000000, flush_log);
emu->log.trace = X86EMU_TRACE_DEFAULT;
return emu;
}
/*
* Setup registers and memory.
*/
int emu_init(x86emu_t *emu, COFF_Reader& Reader)
{
x86emu_set_seg_register(emu, emu->x86.R_CS_SEL, 0); // 2020-10-06
//emu->x86.R_EIP = options.code_start; // 2020-08-11
//if(options.bits_32) {
/* set default data/address size to 32 bit */
emu->x86.R_CS_ACC |= (1 << 10);
emu->x86.R_SS_ACC |= (1 << 10);
/* maximize descriptor limits */
emu->x86.R_CS_LIMIT =
emu->x86.R_DS_LIMIT =
emu->x86.R_ES_LIMIT =
emu->x86.R_FS_LIMIT =
emu->x86.R_GS_LIMIT =
emu->x86.R_SS_LIMIT = ~0;
//printf("code_begin[%08x] code_size[%08x] code_run[%08x] max_instructions(%d)\n",
// options.code_begin, options.code_size, options.code_run,
// options.max_instructions);
// Write whole COFF file to emux86 Memory
for (unsigned int addr = 0; addr < Reader.ObjectCode.size(); addr++)
x86emu_write_byte(emu, addr, Reader.ObjectCode[addr]);
// Initialize Heap to x86emu Memory
u32 Heap_PTR_value = Reader.ObjectCode.size(); // Heap_PTR Value
u32 Heap_END_value = Heap_PTR_value + HEAP_SIZE; // Heap_END Value
for (unsigned int addr = Heap_PTR_value; addr < Heap_END_value; addr++)
x86emu_write_byte(emu, addr, FILL_VALUE); // Fill Mmeory with No Ops
return 1;
}
// FUNCTIONS THAT IMPLEMENT THE X86UTM OPERATING SYSTEM
// FUNCTIONS THAT IMPLEMENT THE X86UTM OPERATING SYSTEM
// FUNCTIONS THAT IMPLEMENT THE X86UTM OPERATING SYSTEM
// FUNCTIONS THAT IMPLEMENT THE X86UTM OPERATING SYSTEM
// FUNCTIONS THAT IMPLEMENT THE X86UTM OPERATING SYSTEM
#define JMP 0xEB // Simplifed OpCode for all forms of JMP
#define CALL 0xE8 // Simplifed OpCode for all forms of CALL
#define JCC 0x7F // Simplifed OpCode for all forms of Jump on Condition
#define RET 0xC3 // Simplifed OpCode for all forms of Return
#define HLT 0xF4 // Conventional OpCode for Halt
#define PUSH 0x68 // Conventional OpCode for Halt
#define MOV 0xC7 // Conventional OpCode for Halt
#define OTHER 0xFF // Not a Control Flow Insrtuction
const char* Get_Simplified_Opcode_String(u32 Simplified_Opcode)
{
switch(Simplified_Opcode)
{
case JMP:
return "JMP ";
case CALL:
return "CALL";
case JCC:
return "JCC ";
case RET:
return "RET ";
case HLT:
return "HLT ";
case PUSH:
return "PUSH";
case MOV:
return "MOV";
default:
return "????";
}
}
struct Line_Of_Code
{
u32 Address;
u32 ESP; // Current Stack Pointer
u32 TOS; // Current Value on the top of the stack
u32 NumBytes;
u32 Simplified_Opcode; // {JMP, CALL, JCC, RET, HLT}
u32 Decode_Target; // Target of {JMP, CALL, JCC}
std::string Disassembly_text;
Line_Of_Code()
{
this->Address = 0;
this->ESP = 0;
this->TOS = 0;
this->NumBytes = 0;
this->Simplified_Opcode = 0;
this->Decode_Target = 0;
};
// Uses the C version FROM x86emu.h for intialization.
Line_Of_Code(const LineOfCode& loc)
{
this->Address = loc.Address;
this->ESP = loc.ESP;
this->TOS = loc.TOS;
this->NumBytes = loc.NumBytes;
this->Simplified_Opcode = 0;
this->Decode_Target = 0;
this->Disassembly_text = loc.Disassembly_text;
};
// Uses the C version FROM x86emu.h for intialization.
Line_Of_Code(const Line_Of_Code& loc)
{
this->Address = loc.Address;
this->ESP = loc.ESP;
this->TOS = loc.TOS;
this->NumBytes = loc.NumBytes;
this->Simplified_Opcode = loc.Simplified_Opcode;
this->Decode_Target = loc.Decode_Target;
this->Disassembly_text = loc.Disassembly_text;
};
void out(x86emu_t *emu);
};
// Used by Local Halt Decider in the emulated code
struct Decoded_Line_Of_Code
{
u32 Address;
u32 ESP;
u32 TOS; // value on top of stack
u32 NumBytes;
u32 Simplified_Opcode; // {JMP, CALL, JCC, RET, HLT}
u32 Decode_Target; // Target of {JMP, CALL, JCC}
Decoded_Line_Of_Code(Line_Of_Code & loc)
{
this->Address = loc.Address;
this->ESP = loc.ESP;
this->TOS = loc.TOS;
this->NumBytes = loc.NumBytes;
this->Simplified_Opcode = loc.Simplified_Opcode;
this->Decode_Target = loc.Decode_Target;
}
void Out()
{
#ifdef DOT_DASH_PREFIX
printf("...[%08x][%08x][%08x](%02d) %02x %08x\n",
Address, ESP, TOS, NumBytes, Simplified_Opcode, Decode_Target);
#else
printf("[%08x][%08x][%08x](%02d) %02x %08x\n",
Address, ESP, TOS, NumBytes, Simplified_Opcode, Decode_Target);
#endif
}
};
std::vector<Line_Of_Code> Execution_Trace;
void Decode_Control_Flow_Instruction(x86emu_t *emu, Line_Of_Code& loc)
{
u8 Opcode_1 = x86emu_read_byte(emu, loc.Address);
u8 Opcode_2 = x86emu_read_byte(emu, loc.Address + 1);
u32 Target = 0x777; // handle possibly unintialized warning 2022-08-07 see below
//printf("Decode_Control_Flow_Instruction([%08x][%02x][%02x])\n",
// loc.Address, Opcode_1, Opcode_2);
std::string Operator_Name; // Get Operator Name
for (u32 N = 0; N < loc.Disassembly_text.size() &&
loc.Disassembly_text[N] != SPACE; N++)
Operator_Name += loc.Disassembly_text[N];
if (Operator_Name == "jmp") // JMP IS DECODED
{
if (loc.NumBytes == 2 && Opcode_1 == 0xEB)
{
s8 Offset = x86emu_read_byte(emu, loc.Address+1);
Target = loc.Address + loc.NumBytes + Offset;
}
else if (loc.NumBytes == 5 && Opcode_1 == 0xE9)
{
s32 Offset = x86emu_read_dword(emu, loc.Address+1);
Target = loc.Address + loc.NumBytes + Offset;
}
else
printf("[%08x] JMP not decoded correctly! [%02x](%d)\n",
loc.Address, Opcode_1, loc.NumBytes);
loc.Simplified_Opcode = JMP; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = Target; // Target of {JMP, CALL, JCC}
}
else if (Operator_Name == "mov") // MOV IS DECODED // 2023-07-01
{
if (loc.NumBytes == 7 && Opcode_1 == 0xC7 && Opcode_2 == 0x45)
{
s8 Offset = x86emu_read_byte(emu, loc.Address+2);
u32 address = emu->x86.R_EBP + Offset;
u32 immediate = x86emu_read_dword(emu, loc.Address+3);
u32 data = x86emu_read_dword(emu, address);
// printf("---[%08x] mov [%08x], %08x\n", // 2023-07-01
// loc.Address, address, immediate); // 2023-07-01
}
// [00001ff4] c7 45 dc 78563412 mov [ebp-24],12345678
// printf("[%08x] mov instruction[%02x][%02x](%d)\n", // 2023-07-01
// loc.Address, Opcode_1, Opcode_2, loc.NumBytes); // 2023-07-01
}
else if (Operator_Name == "call") // CALL IS DECODED
{
if (loc.NumBytes == 5 && Opcode_1 == 0xE8)
{
s32 Offset = x86emu_read_dword(emu, loc.Address+1);
Target = loc.Address + loc.NumBytes + Offset;
}
// call dword [ebp+08] is decoded here
// We are not going to decode other combinations until they are needed
// Opcode_2 contains register number: 0x50-0x57: {EAX ECX EDX EBX ESP EBP ESI EDI}
else if (loc.NumBytes == 3 && Opcode_1 == 0xFF && Opcode_2 == 0x55)
{
s8 Offset = x86emu_read_byte(emu, loc.Address+2);
Target = x86emu_read_dword(emu, emu->x86.R_EBP + Offset);
// printf("CD_Decode_Control_Flow_Instruction([%02d][%08x][%08x])\n",
// Offset, emu->x86.R_EBP, Target);
printf("[%08x] call (absolute) [%08x]\n", loc.Address, Target);
if (Target == 0)
exit(0);
}
else if (loc.NumBytes == 6 && Opcode_1 == 0xFF && Opcode_2 == 0x15)
{
// [00103978][0015e434][0010397e] ff15 b301 0000 call dword [000001b3]
s32 Offset = x86emu_read_dword(emu, loc.Address+2);
Target = x86emu_read_dword(emu, Offset);
printf("CD_Decode_Control_Flow_Instruction([%02d][%08x][%08x])\n",
Offset, emu->x86.R_EBP, Target);
printf("[%08x] call (absolute) [%08x]\n", loc.Address, Target);
if (Target == 0)
exit(0);
}
else
printf("[%08x] CALL not decoded correctly!\n", loc.Address);
loc.Simplified_Opcode = CALL; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = Target; // Target of {JMP, CALL, JCC}
}
else if (Operator_Name == "push") // CALL IS DECODED
{
if (loc.NumBytes == 5 && Opcode_1 == 0x68)
loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
else if (loc.NumBytes == 1 && (Opcode_1 >= 0x50 && Opcode_1 <= 0x57))
loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
else if (loc.NumBytes == 3 && Opcode_1 >= 0xff && Opcode_2 == 0x75)
loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
else if (loc.NumBytes == 2 && (Opcode_1 >= 0x6a))
loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
else if (loc.NumBytes == 6 && Opcode_1 >= 0xff && Opcode_2 == 0x35)
{
loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
u32 Target = x86emu_read_dword(emu, loc.Address+2);
loc.Decode_Target = Target;
return; // prevent fall through to wrong assignment of loc.Decode_Target
}
else
{
printf("[%08x](%d) PUSH not decoded correctly!\n", loc.Address, loc.NumBytes);
printf("Here are the bytes:");
for (u32 N = 0; N < loc.NumBytes; N++)
printf("[%02x]", x86emu_read_byte(emu, loc.Address+N));
printf("\n");
exit(0); // Make sure that user notices this error
}
// loc.Simplified_Opcode = PUSH; // {JMP, CALL, JCC, RET, HLT, PUSH}
loc.Decode_Target = loc.TOS; //
}
// Single Opcode JCC (Jump-Condition-Code)
else if (Opcode_1 > 0x70 && Opcode_1 <= 0x7f)
{
if (loc.NumBytes == 2)
{
s8 Offset = x86emu_read_byte(emu, loc.Address+1);
Target = loc.Address + loc.NumBytes + Offset;
}
else
printf("[%08x] JCC not decoded correctly!\n", loc.Address);
loc.Simplified_Opcode = JCC; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = Target; // Target of {JMP, CALL, JCC}
}
// Double Opcode JCC (Jump-Condition-Code)
else if (Opcode_1 == 0x0f && (Opcode_2 >= 0x80 && Opcode_2 <= 0x8f))
{
if (loc.NumBytes == 6)
{
s32 Offset = x86emu_read_dword(emu, loc.Address+2);
Target = loc.Address + loc.NumBytes + Offset;
}
else
printf("[%08x] JCC not decoded correctly! [%02x][%02x](%d)\n",
loc.Address, Opcode_1, Opcode_2, loc.NumBytes);
loc.Simplified_Opcode = JCC; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = Target; // Target of {JMP, CALL, JCC} // handle possibly unintialized warning 2022-08-07 HERE
}
else if (Operator_Name == "ret")
{
loc.Simplified_Opcode = RET; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = 0; // Target of {JMP, CALL, JCC}
}
else if (Operator_Name == "hlt")
{
loc.Simplified_Opcode = HLT; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = 0; // Target of {JMP, CALL, JCC}
}
else // Not a Control Flow Instruction
{
loc.Simplified_Opcode = OTHER; // {JMP, CALL, JCC, RET, HLT}
loc.Decode_Target = 0; // Target of {JMP, CALL, JCC}
}
/***
printf("Decode_Control_Flow_Instruction([%08x][%02x][%02x]) [%02x][%08x]\n",
loc.Address, Opcode_1, Opcode_2, loc.Simplified_Opcode, loc.Decode_Target);
***/
}
struct X86_UTM
{
std::vector<Line_Of_Code> Disassembly;
u32 code_begin;
u32 code_end;
u32 code_run;
void Disassembly_Out(X86_UTM x86utm){ }
};
void Machine_Code_Out(x86emu_t *emu, u32 Address, u32 Length)
{
if (Length > MAX_MACHINE_CODE_BYTES)
for (u32 N = 0; N < MAX_MACHINE_CODE_BYTES; N++)
printf("??");
else
{
for (u32 N = Address; N < Address + Length; N++)
printf("%02x", x86emu_read_byte(emu, N));
for (u32 N = Length; N < MAX_MACHINE_CODE_BYTES; N++)
printf(" ");
}
}
//
// Disassembly AFTER the instruction has been executed
//
void Disassembled_line_out(x86emu_t *emu)
{
Line_Of_Code loc(emu->line_of_code);
//printf("Disassembled_line_out (1)\n");
//printf("[%08x][%08x](%02d) ",
// emu->line_of_code.Address, emu->line_of_code.ESP,
//printf("...[%08x][%08x][%08x](%02d) ",
#ifdef DOT_DASH_PREFIX
printf("...[%08x][%08x][%08x] ",
emu->line_of_code.Address,
emu->line_of_code.ESP,
emu->line_of_code.TOS);
#else
printf("[%08x][%08x][%08x] ",
emu->line_of_code.Address,
emu->line_of_code.ESP,
emu->line_of_code.TOS);
#endif
Machine_Code_Out(emu, emu->line_of_code.Address,
emu->line_of_code.NumBytes);
printf(" %s\n", emu->line_of_code.Disassembly_text);
}
//
// Disassembly AFTER the instruction has been executed
//
void Disassembled_line_out(x86emu_t *emu, Line_Of_Code& loc)
{
//printf("Disassembled_line_out (2)\n");
//printf("[%08x](%02d) ", loc.Address, loc.NumBytes);
#ifdef DOT_DASH_PREFIX
printf("...[%08x][%08x][%08x] ",
loc.Address,
loc.ESP,
loc.TOS);
#else
printf("[%08x][%08x][%08x] ",
loc.Address,
loc.ESP,
loc.TOS);
#endif
Machine_Code_Out(emu, loc.Address, loc.NumBytes);
printf(" %s\n", loc.Disassembly_text.c_str());
}
//
// Disassembly AFTER the instruction has been executed
//
void Disassembled_line_source_out(x86emu_t *emu, Line_Of_Code& loc)
{
//printf("Disassembled_line_source_out\n");
//printf("[%08x](%02d) ", loc.Address, loc.NumBytes);
printf("[%08x] ", loc.Address);
Machine_Code_Out(emu, loc.Address, loc.NumBytes);
printf(" %s\n", loc.Disassembly_text.c_str());
}
//
// Disassembly AFTER the instruction has been executed
//
void Disassembled_line_out2(x86emu_t *emu, Line_Of_Code& loc)
{
//printf("Disassembled_line_out2\n");
//printf("---[%08x][%08x][%08x](%02d) ",
// loc.Address, loc.ESP, loc.TOS, loc.NumBytes);
#ifdef DOT_DASH_PREFIX
printf("---[%08x][%08x][%08x] ", loc.Address, loc.ESP, loc.TOS);
#else
printf("[%08x][%08x][%08x] ", loc.Address, loc.ESP, loc.TOS);
#endif
Machine_Code_Out(emu, loc.Address, loc.NumBytes);
printf(" %s\n", loc.Disassembly_text.c_str());
}
// We need this to obtain the function call of a Virtual Machine Instruction.
Line_Of_Code& Get_Line_Of_Code_From_Machine_Address(x86emu_t *emu,
X86_UTM& x86utm, COFF_Reader& Reader, u32 Machine_Address)
{
static Line_Of_Code Empty;
for (u32 N = 0; N < x86utm.Disassembly.size(); N++)
if (x86utm.Disassembly[N].Address == Machine_Address)
return x86utm.Disassembly[N];
return Empty; // Should Never Occur
}
void output_numbytes(const char* CH, int numbytes)
{
for (int N = 1; N <= numbytes; N++)
printf("%s", CH);
}
void Disassembly_Listing(x86emu_t *emu, X86_UTM& x86utm, COFF_Reader& Reader)
{
std::map<u32, Function_Info>::iterator Found;
printf("===============================\n");
printf("Disassembly Listing\n");
u32 size_in_bytes = 0;
u32 function_address = 0;
for (u32 N = 0; N < x86utm.Disassembly.size(); N++)
{
// u32 size_in_bytes = 0;
u32 OpCode = x86emu_read_byte(emu, x86utm.Disassembly[N].Address);
// printf("OpCode (%02x)\n", OpCode);
if (OpCode != INT_3)
{
u32 Address = x86utm.Disassembly[N].Address;
Found = Reader.FunctionNames.find(Address);
if(Found != Reader.FunctionNames.end())
{
printf("%s()\n", Found->second.Name.c_str());
function_address = x86utm.Disassembly[N].Address;
}
// Disassembled_line_out(emu, x86utm.Disassembly[N]);
Disassembled_line_source_out(emu, x86utm.Disassembly[N]);
size_in_bytes += x86utm.Disassembly[N].NumBytes;
}
if (OpCode == RETURN)
{
printf("Size in bytes:(%04d) [%08x]\n\n", size_in_bytes, x86utm.Disassembly[N].Address);
Found = Reader.FunctionNames.find(function_address);
if(Found != Reader.FunctionNames.end())
{
Found->second.code_end = x86utm.Disassembly[N].Address; // 2021-03-18
// printf("[%08x] %s [%08x]\n\n", Found->first, Found->second.Name.c_str(), Found->second.code_end);
}
size_in_bytes = 0;
}
}
//printf("===============================\n");
/***
printf(" machine stack stack machine assembly\n");
printf(" address address data code language\n");
printf(" ======== ======== ======== ========= =============\n");
***/
printf(" machine stack stack machine ");
output_numbytes(" ", (MAX_MACHINE_CODE_BYTES * 2) - 11);
printf("assembly\n");
printf(" address address data code ");
output_numbytes(" ", (MAX_MACHINE_CODE_BYTES * 2) - 11);
printf("language\n");
printf(" ======== ======== ======== ");
output_numbytes("=", (MAX_MACHINE_CODE_BYTES * 2));
printf(" =============\n");
}
//
// Finds the FIRST and LAST ADDRESS of the named function.
// Return the value of the LAST ADDRESS.
//
// This LAST ADDRESS is used by the global halt decider to
// ignore the exection trace of the halt decider and the
// operating system function calls.
//
u32 Disassembly_Listing_Find_Function(x86emu_t *emu,
X86_UTM& x86utm,
COFF_Reader& Reader,
std::string Function_Name)
{
u32 Address = 0;
bool Found_Named_Function = false;
std::map<u32, Function_Info>::iterator Found;
//printf("Disassembly_Listing_Find_Function\n");
for (u32 N = 0; N < x86utm.Disassembly.size(); N++)
{
u32 OpCode = x86emu_read_byte(emu, x86utm.Disassembly[N].Address);
if (OpCode != INT_3)
{
Address = x86utm.Disassembly[N].Address;
Found = Reader.FunctionNames.find(Address);
if(Found != Reader.FunctionNames.end())
{
if (Function_Name == Found->second.Name.c_str())
{
Found_Named_Function = true;
// printf("Found The Function: [%s](%s)\n", Found->second.Name.c_str(),
// Function_Name.c_str());
// Disassembled_line_out(emu, x86utm.Disassembly[N]);
}
}
}
if (OpCode == RETURN && Found_Named_Function)
{
// Disassembled_line_out(emu, x86utm.Disassembly[N]);
// printf("===============================\n\n");
return Address;
}
}
exit(0);
return 0xffffffff; // Should never get here
}
u32 get_disassembly_listing(unsigned flags, COFF_Reader& Reader, X86_UTM& x86utm)
{
// Microsoft "C" uses the the 0xCC "int 3" OpCode as a padding byte between
// functions. The x86emu disassembler gets confused by this padding character
// so we change it to the 0x90 "nop" Opcode.
//printf("get_disassembly_listing()\n");
for (u32 N = x86utm.code_begin; N <= x86utm.code_end; N++)
if (Reader.ObjectCode[N] == RETURN)
{
N++;
while (Reader.ObjectCode[N] == INT_3)
Reader.ObjectCode[N++] = FILL_VALUE;
}
printf("code_begin[%08x] code_end[%08x]\n", x86utm.code_begin, x86utm.code_end);
x86emu_t *emu2 = emu_new();
int ok = 0;
ok = emu_init(emu2, Reader);
if (!ok)
return 0;
emu2->max_instr = 1; // 2020-05-26
emu2->x86.R_EIP = x86utm.code_begin; // 2020-07-25
u32 Counter = 0; // eliminate warning 2022-08-07
while (emu2->x86.R_EIP <= x86utm.code_end) // 2020-05-26
{ // 2020-05-26
// printf("EIP[%08x]----", emu2->x86.R_EIP, Counter++);
// printf("%s\n", emu->line_of_code.Disassembly_text);
// This calls the disassembly printf in decode x86emu_run()
x86emu_run(emu2, flags, TRUE);
// Disassembled_line_out(emu2);
Line_Of_Code loc(emu2->line_of_code);
x86utm.Disassembly.push_back(loc);
emu2->max_instr++; // 2020-05-26
} // 2020-05-26
//disassembly_listing_out(emu2);
//emu->Disassembly = emu2->Disassembly;
x86emu_done(emu2);
//printf("===============================\n");
return 1;
}
// Resets to Not Halted
void ResetHalted(x86emu_t *emu)