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sim8086: Split into multiple files

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doyle 2023-03-29 00:05:28 +11:00
parent 8c76652940
commit 8b8edbe09b
4 changed files with 432 additions and 428 deletions
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431
part1/sim8086.c
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@ -1,435 +1,10 @@
#define WIN32_MEAN_AND_LEAN #include "sim8086_stdlib.h"
#define NOMINMAX #include "sim8086.h"
#include <Windows.h>
#include <stdint.h> #include "sim8086_stdlib.c"
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
// NOTE: Macros
// ============================================================================
#define S86_STRINGIFY2(token) #token
#define S86_STRINGIFY(token) S86_STRINGIFY2(token)
#define S86_ASSERT(expr) \
if (!(expr)) { \
S86_PrintLnFmt("Assertion triggered [file=\"" __FILE__ ":" S86_STRINGIFY(__LINE__) "\", expr=\"" #expr "\"]"); \
__debugbreak(); \
} \
#define S86_ARRAY_UCOUNT(array) sizeof((array)) / sizeof((array)[0])
#define S86_CAST(Type) (Type)
// NOTE: Globals
// ============================================================================
typedef struct S86_Globals {
HANDLE stdout_handle;
bool write_to_console;
} S86_Globals;
S86_Globals s86_globals;
// NOTE: Strings
// ============================================================================
typedef struct S86_Str8 {
char *data;
size_t size;
} S86_Str8;
#define S86_STR8(string) (S86_Str8){.data = (string), .size = S86_ARRAY_UCOUNT(string) - 1 }
#define S86_STR8_FMT(string) (int)((string).size), (string).data
// NOTE: Buffer
// ============================================================================
typedef struct S86_Buffer {
char *data;
size_t size;
} S86_Buffer;
typedef struct S86_BufferIterator {
S86_Buffer buffer;
size_t index;
} S86_BufferIterator;
bool S86_BufferIsValid(S86_Buffer buffer);
S86_BufferIterator S86_BufferIteratorInit(S86_Buffer buffer);
bool S86_BufferIteratorHasMoreBytes(S86_BufferIterator it);
uint8_t S86_BufferIteratorNextByte(S86_BufferIterator *it);
// NOTE: File
// ============================================================================
S86_Buffer S86_FileRead(char const *file_path);
void S86_FileFree(S86_Buffer buffer);
// NOTE: Print
// ============================================================================
void S86_PrintLn(S86_Str8 string);
void S86_PrintLnFmt(char const *fmt, ...);
// NOTE: Sim8086
// ============================================================================
typedef enum S86_InstructionType {
S86_InstructionType_MOVRegOrMemToOrFromReg,
S86_InstructionType_MOVImmediateToRegOrMem,
S86_InstructionType_MOVImmediateToReg,
S86_InstructionType_MOVMemToAccum,
S86_InstructionType_MOVAccumToMem,
S86_InstructionType_MOVRegOrMemToSegReg,
S86_InstructionType_MOVSegRegToRegOrMem,
S86_InstructionType_PUSHRegOrMem,
S86_InstructionType_PUSHReg,
S86_InstructionType_PUSHSegReg,
S86_InstructionType_POPRegOrMem,
S86_InstructionType_POPReg,
S86_InstructionType_POPSegReg,
S86_InstructionType_XCHGRegOrMemWithReg,
S86_InstructionType_XCHGRegWithAccum,
S86_InstructionType_INFixedPort,
S86_InstructionType_INVariablePort,
S86_InstructionType_OUTFixedPort,
S86_InstructionType_OUTVariablePort,
S86_InstructionType_XLAT,
S86_InstructionType_LEA,
S86_InstructionType_LDS,
S86_InstructionType_LES,
S86_InstructionType_LAHF,
S86_InstructionType_SAHF,
S86_InstructionType_PUSHF,
S86_InstructionType_POPF,
S86_InstructionType_ADDRegOrMemToOrFromReg,
S86_InstructionType_ADDImmediateToRegOrMem,
S86_InstructionType_ADDImmediateToAccum,
S86_InstructionType_ADCRegOrMemWithRegToEither,
S86_InstructionType_ADCImmediateToRegOrMem,
S86_InstructionType_ADCImmediateToAccum,
S86_InstructionType_INCRegOrMem,
S86_InstructionType_INCReg,
S86_InstructionType_AAA,
S86_InstructionType_DAA,
S86_InstructionType_SUBRegOrMemToOrFromReg,
S86_InstructionType_SUBImmediateFromRegOrMem,
S86_InstructionType_SUBImmediateFromAccum,
S86_InstructionType_SBBRegOrMemAndRegToEither,
S86_InstructionType_SBBImmediateFromRegOrMem,
S86_InstructionType_SBBImmediateFromAccum,
S86_InstructionType_DECRegOrMem,
S86_InstructionType_DECReg,
S86_InstructionType_NEG,
S86_InstructionType_CMPRegOrMemAndReg,
S86_InstructionType_CMPImmediateWithRegOrMem,
S86_InstructionType_CMPImmediateWithAccum,
S86_InstructionType_AAS,
S86_InstructionType_DAS,
S86_InstructionType_MUL,
S86_InstructionType_IMUL,
S86_InstructionType_AAM,
S86_InstructionType_DIV,
S86_InstructionType_IDIV,
S86_InstructionType_AAD,
S86_InstructionType_CBW,
S86_InstructionType_CWD,
S86_InstructionType_NOT,
S86_InstructionType_SHL_SAL,
S86_InstructionType_SHR,
S86_InstructionType_SAR,
S86_InstructionType_ROL,
S86_InstructionType_ROR,
S86_InstructionType_RCL,
S86_InstructionType_RCR,
S86_InstructionType_ANDRegWithMemToEither,
S86_InstructionType_ANDImmediateToRegOrMem,
S86_InstructionType_ANDImmediateToAccum,
S86_InstructionType_TESTRegOrMemAndReg,
S86_InstructionType_TESTImmediateAndRegOrMem,
S86_InstructionType_TESTImmediateAndAccum,
S86_InstructionType_ORRegOrMemAndRegToEither,
S86_InstructionType_ORImmediateToRegOrMem,
S86_InstructionType_ORImmediateToAccum,
S86_InstructionType_XORRegOrMemAndRegToEither,
S86_InstructionType_XORImmediateToRegOrMem,
S86_InstructionType_XORImmediateToAccum,
S86_InstructionType_REP,
S86_InstructionType_CALLDirectWithinSeg,
S86_InstructionType_CALLIndirectWithinSeg,
S86_InstructionType_CALLDirectInterSeg,
S86_InstructionType_CALLIndirectInterSeg,
S86_InstructionType_JMPDirectWithinSeg,
S86_InstructionType_JMPDirectWithinSegShort,
S86_InstructionType_JMPIndirectWithinSeg,
S86_InstructionType_JMPDirectInterSeg,
S86_InstructionType_JMPIndirectInterSeg,
S86_InstructionType_RETWithinSeg,
S86_InstructionType_RETWithinSegAddImmediateToSP,
S86_InstructionType_RETInterSeg,
S86_InstructionType_RETInterSegAddImmediateToSP,
S86_InstructionType_JE_JZ,
S86_InstructionType_JL_JNGE,
S86_InstructionType_JLE_JNG,
S86_InstructionType_JB_JNAE,
S86_InstructionType_JBE_JNA,
S86_InstructionType_JP_JPE,
S86_InstructionType_JO,
S86_InstructionType_JS,
S86_InstructionType_JNE_JNZ,
S86_InstructionType_JNL_JGE,
S86_InstructionType_JNLE_JG,
S86_InstructionType_JNB_JAE,
S86_InstructionType_JNBE_JA,
S86_InstructionType_JNP_JO,
S86_InstructionType_JNO,
S86_InstructionType_JNS,
S86_InstructionType_LOOP,
S86_InstructionType_LOOPZ_LOOPE,
S86_InstructionType_LOOPNZ_LOOPNE,
S86_InstructionType_JCXZ,
S86_InstructionType_INT,
S86_InstructionType_INT3,
S86_InstructionType_INTO,
S86_InstructionType_IRET,
S86_InstructionType_CLC,
S86_InstructionType_CMC,
S86_InstructionType_STC,
S86_InstructionType_CLD,
S86_InstructionType_STD,
S86_InstructionType_CLI,
S86_InstructionType_STI,
S86_InstructionType_HLT,
S86_InstructionType_WAIT,
S86_InstructionType_LOCK,
S86_InstructionType_SEGMENT,
S86_InstructionType_Count,
} S86_InstructionType;
/// Bit patterns and masks for decoding 8086 assembly. 8086 opcodes can be up
/// to 2 bytes long and mixed with instruction specific control bits. These
/// masks isolate the opcode bits from the bits can be checked after masking
/// the binary instruction stream.
///
/// Instructions that do not have opcode bits in the 2nd byte will have the mask
/// set to 0.
typedef struct S86_Instruction {
uint8_t op_mask0;
uint8_t op_bits0;
uint8_t op_mask1;
uint8_t op_bits1;
S86_Str8 mnemonic;
} S86_Instruction;
typedef struct S86_EffectiveAddressStr8 {
char data[32];
size_t size;
bool has_displacement;
} S86_EffectiveAddressStr8;
S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg);
// NOTE: Implementation // NOTE: Implementation
// ============================================================================ // ============================================================================
bool S86_BufferIsValid(S86_Buffer buffer)
{
bool result = buffer.data && buffer.size;
return result;
}
S86_BufferIterator S86_BufferIteratorInit(S86_Buffer buffer)
{
S86_BufferIterator result = {0};
result.buffer = buffer;
return result;
}
bool S86_BufferIteratorHasMoreBytes(S86_BufferIterator it)
{
bool result = S86_BufferIsValid(it.buffer) && it.index < it.buffer.size;
return result;
}
uint8_t S86_BufferIteratorPeekByte(S86_BufferIterator *it)
{
S86_ASSERT(it);
S86_ASSERT(S86_BufferIsValid(it->buffer));
S86_ASSERT(it->index < it->buffer.size);
uint8_t result = it->buffer.data[it->index];
return result;
}
uint8_t S86_BufferIteratorNextByte(S86_BufferIterator *it)
{
uint8_t result = S86_BufferIteratorPeekByte(it);
it->index++;
return result;
}
S86_Buffer S86_FileRead(char const *file_path)
{
S86_Buffer result = {0};
// NOTE: Determine file size
// =========================================================================
WIN32_FILE_ATTRIBUTE_DATA file_attrib_data = {0};
if (GetFileAttributesEx(file_path, GetFileExInfoStandard, &file_attrib_data) == 0)
return result;
// NOTE: Open file
// =========================================================================
HANDLE file_handle = CreateFile(
/*LPCSTR lpFileName*/ file_path,
/*DWORD dwDesiredAccess*/ GENERIC_READ,
/*DWORD dwShareMode*/ 0,
/*LPSECURITY_ATTRIBUTES lpSecurityAttributes*/ NULL,
/*DWORD dwCreationDisposition*/ OPEN_EXISTING,
/*DWORD dwFlagsAndAttributes*/ 0,
/*HANDLE hTemplateFile*/ NULL
);
if (file_handle == INVALID_HANDLE_VALUE)
return result;
// NOTE: Allocate buffer
// =========================================================================
uint64_t file_size = (uint64_t)file_attrib_data.nFileSizeHigh << 32 | (uint64_t)file_attrib_data.nFileSizeLow << 0;
S86_ASSERT(file_size < (DWORD)-1);
char *buffer = VirtualAlloc(
/*LPVOID lpAddress*/ NULL,
/*SIZE_T dwSize*/ file_size,
/*DWORD flAllocationType*/ MEM_COMMIT | MEM_RESERVE,
/*DWORD flProtect*/ PAGE_READWRITE
);
if (!buffer)
goto end;
// NOTE: Read file to buffer
// =========================================================================
DWORD bytes_read = 0;
BOOL read_file_result = ReadFile(
/*HANDLE hFile*/ file_handle,
/*LPVOID lpBuffer*/ buffer,
/*DWORD nNumberOfBytesToRead*/ S86_CAST(DWORD)file_size,
/*LPDWORD lpNumberOfBytesRead*/ &bytes_read,
/*LPOVERLAPPED lpOverlapped*/ NULL
);
// NOTE: Handle read result
// =========================================================================
if (read_file_result == 0) {
VirtualFree(buffer, 0, MEM_RELEASE);
} else {
result.data = buffer;
result.size = file_size;
}
end:
CloseHandle(file_handle);
return result;
};
void S86_FileFree(S86_Buffer buffer)
{
if (S86_BufferIsValid(buffer))
VirtualFree(buffer.data, 0, MEM_RELEASE);
}
void S86_Print(S86_Str8 string)
{
if (s86_globals.stdout_handle == NULL) {
s86_globals.stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD mode = 0;
BOOL get_console_mode_result = GetConsoleMode(
/*HANDLE hConsoleHandle*/ s86_globals.stdout_handle,
/*LPDWORD lpMode*/ &mode
);
s86_globals.write_to_console = get_console_mode_result != 0;
}
S86_ASSERT(string.size < S86_CAST(DWORD)-1);
if (s86_globals.write_to_console) {
DWORD chars_written = 0;
WriteConsoleA(s86_globals.stdout_handle, string.data, (DWORD)string.size, &chars_written, NULL);
} else {
DWORD bytes_written = 0;
WriteFile(s86_globals.stdout_handle, string.data, (DWORD)string.size, &bytes_written, NULL);
}
}
void S86_PrintFmt(char const *fmt, ...)
{
va_list args, args_copy;
va_start(args, fmt);
va_copy(args_copy, args);
int string_size = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
char buffer[8192];
S86_ASSERT(string_size >= 0 && string_size < S86_ARRAY_UCOUNT(buffer));
if (string_size) {
vsnprintf(buffer, sizeof(buffer), fmt, args);
S86_Str8 string = {.data = buffer, .size = string_size};
S86_Print(string);
}
va_end(args);
}
void S86_PrintLn(S86_Str8 string)
{
S86_Print(string);
S86_Print(S86_STR8("\n"));
}
void S86_PrintLnFmt(char const *fmt, ...)
{
va_list args, args_copy;
va_start(args, fmt);
va_copy(args_copy, args);
int string_size = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
char buffer[8192];
S86_ASSERT(string_size >= 0 && string_size < S86_ARRAY_UCOUNT(buffer));
if (string_size) {
vsnprintf(buffer, sizeof(buffer), fmt, args);
S86_Str8 string = {.data = buffer, .size = string_size};
S86_PrintLn(string);
}
va_end(args);
}
S86_Str8 REGISTER_FIELD_ENCODING[2][8]; S86_Str8 REGISTER_FIELD_ENCODING[2][8];
S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg) S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg)
{ {

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part1/sim8086.h Normal file
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// NOTE: Sim8086
// ============================================================================
typedef enum S86_InstructionType {
S86_InstructionType_MOVRegOrMemToOrFromReg,
S86_InstructionType_MOVImmediateToRegOrMem,
S86_InstructionType_MOVImmediateToReg,
S86_InstructionType_MOVMemToAccum,
S86_InstructionType_MOVAccumToMem,
S86_InstructionType_MOVRegOrMemToSegReg,
S86_InstructionType_MOVSegRegToRegOrMem,
S86_InstructionType_PUSHRegOrMem,
S86_InstructionType_PUSHReg,
S86_InstructionType_PUSHSegReg,
S86_InstructionType_POPRegOrMem,
S86_InstructionType_POPReg,
S86_InstructionType_POPSegReg,
S86_InstructionType_XCHGRegOrMemWithReg,
S86_InstructionType_XCHGRegWithAccum,
S86_InstructionType_INFixedPort,
S86_InstructionType_INVariablePort,
S86_InstructionType_OUTFixedPort,
S86_InstructionType_OUTVariablePort,
S86_InstructionType_XLAT,
S86_InstructionType_LEA,
S86_InstructionType_LDS,
S86_InstructionType_LES,
S86_InstructionType_LAHF,
S86_InstructionType_SAHF,
S86_InstructionType_PUSHF,
S86_InstructionType_POPF,
S86_InstructionType_ADDRegOrMemToOrFromReg,
S86_InstructionType_ADDImmediateToRegOrMem,
S86_InstructionType_ADDImmediateToAccum,
S86_InstructionType_ADCRegOrMemWithRegToEither,
S86_InstructionType_ADCImmediateToRegOrMem,
S86_InstructionType_ADCImmediateToAccum,
S86_InstructionType_INCRegOrMem,
S86_InstructionType_INCReg,
S86_InstructionType_AAA,
S86_InstructionType_DAA,
S86_InstructionType_SUBRegOrMemToOrFromReg,
S86_InstructionType_SUBImmediateFromRegOrMem,
S86_InstructionType_SUBImmediateFromAccum,
S86_InstructionType_SBBRegOrMemAndRegToEither,
S86_InstructionType_SBBImmediateFromRegOrMem,
S86_InstructionType_SBBImmediateFromAccum,
S86_InstructionType_DECRegOrMem,
S86_InstructionType_DECReg,
S86_InstructionType_NEG,
S86_InstructionType_CMPRegOrMemAndReg,
S86_InstructionType_CMPImmediateWithRegOrMem,
S86_InstructionType_CMPImmediateWithAccum,
S86_InstructionType_AAS,
S86_InstructionType_DAS,
S86_InstructionType_MUL,
S86_InstructionType_IMUL,
S86_InstructionType_AAM,
S86_InstructionType_DIV,
S86_InstructionType_IDIV,
S86_InstructionType_AAD,
S86_InstructionType_CBW,
S86_InstructionType_CWD,
S86_InstructionType_NOT,
S86_InstructionType_SHL_SAL,
S86_InstructionType_SHR,
S86_InstructionType_SAR,
S86_InstructionType_ROL,
S86_InstructionType_ROR,
S86_InstructionType_RCL,
S86_InstructionType_RCR,
S86_InstructionType_ANDRegWithMemToEither,
S86_InstructionType_ANDImmediateToRegOrMem,
S86_InstructionType_ANDImmediateToAccum,
S86_InstructionType_TESTRegOrMemAndReg,
S86_InstructionType_TESTImmediateAndRegOrMem,
S86_InstructionType_TESTImmediateAndAccum,
S86_InstructionType_ORRegOrMemAndRegToEither,
S86_InstructionType_ORImmediateToRegOrMem,
S86_InstructionType_ORImmediateToAccum,
S86_InstructionType_XORRegOrMemAndRegToEither,
S86_InstructionType_XORImmediateToRegOrMem,
S86_InstructionType_XORImmediateToAccum,
S86_InstructionType_REP,
S86_InstructionType_CALLDirectWithinSeg,
S86_InstructionType_CALLIndirectWithinSeg,
S86_InstructionType_CALLDirectInterSeg,
S86_InstructionType_CALLIndirectInterSeg,
S86_InstructionType_JMPDirectWithinSeg,
S86_InstructionType_JMPDirectWithinSegShort,
S86_InstructionType_JMPIndirectWithinSeg,
S86_InstructionType_JMPDirectInterSeg,
S86_InstructionType_JMPIndirectInterSeg,
S86_InstructionType_RETWithinSeg,
S86_InstructionType_RETWithinSegAddImmediateToSP,
S86_InstructionType_RETInterSeg,
S86_InstructionType_RETInterSegAddImmediateToSP,
S86_InstructionType_JE_JZ,
S86_InstructionType_JL_JNGE,
S86_InstructionType_JLE_JNG,
S86_InstructionType_JB_JNAE,
S86_InstructionType_JBE_JNA,
S86_InstructionType_JP_JPE,
S86_InstructionType_JO,
S86_InstructionType_JS,
S86_InstructionType_JNE_JNZ,
S86_InstructionType_JNL_JGE,
S86_InstructionType_JNLE_JG,
S86_InstructionType_JNB_JAE,
S86_InstructionType_JNBE_JA,
S86_InstructionType_JNP_JO,
S86_InstructionType_JNO,
S86_InstructionType_JNS,
S86_InstructionType_LOOP,
S86_InstructionType_LOOPZ_LOOPE,
S86_InstructionType_LOOPNZ_LOOPNE,
S86_InstructionType_JCXZ,
S86_InstructionType_INT,
S86_InstructionType_INT3,
S86_InstructionType_INTO,
S86_InstructionType_IRET,
S86_InstructionType_CLC,
S86_InstructionType_CMC,
S86_InstructionType_STC,
S86_InstructionType_CLD,
S86_InstructionType_STD,
S86_InstructionType_CLI,
S86_InstructionType_STI,
S86_InstructionType_HLT,
S86_InstructionType_WAIT,
S86_InstructionType_LOCK,
S86_InstructionType_SEGMENT,
S86_InstructionType_Count,
} S86_InstructionType;
/// Bit patterns and masks for decoding 8086 assembly. 8086 opcodes can be up
/// to 2 bytes long and mixed with instruction specific control bits. These
/// masks isolate the opcode bits from the bits can be checked after masking
/// the binary instruction stream.
///
/// Instructions that do not have opcode bits in the 2nd byte will have the mask
/// set to 0.
typedef struct S86_Instruction {
uint8_t op_mask0;
uint8_t op_bits0;
uint8_t op_mask1;
uint8_t op_bits1;
S86_Str8 mnemonic;
} S86_Instruction;
typedef struct S86_EffectiveAddressStr8 {
char data[32];
size_t size;
bool has_displacement;
} S86_EffectiveAddressStr8;
S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg);

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part1/sim8086_stdlib.c Normal file
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// NOTE: Implementation
// ============================================================================
bool S86_BufferIsValid(S86_Buffer buffer)
{
bool result = buffer.data && buffer.size;
return result;
}
S86_BufferIterator S86_BufferIteratorInit(S86_Buffer buffer)
{
S86_BufferIterator result = {0};
result.buffer = buffer;
return result;
}
bool S86_BufferIteratorHasMoreBytes(S86_BufferIterator it)
{
bool result = S86_BufferIsValid(it.buffer) && it.index < it.buffer.size;
return result;
}
uint8_t S86_BufferIteratorPeekByte(S86_BufferIterator *it)
{
S86_ASSERT(it);
S86_ASSERT(S86_BufferIsValid(it->buffer));
S86_ASSERT(it->index < it->buffer.size);
uint8_t result = it->buffer.data[it->index];
return result;
}
uint8_t S86_BufferIteratorNextByte(S86_BufferIterator *it)
{
uint8_t result = S86_BufferIteratorPeekByte(it);
it->index++;
return result;
}
S86_Buffer S86_FileRead(char const *file_path)
{
S86_Buffer result = {0};
// NOTE: Determine file size
// =========================================================================
WIN32_FILE_ATTRIBUTE_DATA file_attrib_data = {0};
if (GetFileAttributesEx(file_path, GetFileExInfoStandard, &file_attrib_data) == 0)
return result;
// NOTE: Open file
// =========================================================================
HANDLE file_handle = CreateFile(
/*LPCSTR lpFileName*/ file_path,
/*DWORD dwDesiredAccess*/ GENERIC_READ,
/*DWORD dwShareMode*/ 0,
/*LPSECURITY_ATTRIBUTES lpSecurityAttributes*/ NULL,
/*DWORD dwCreationDisposition*/ OPEN_EXISTING,
/*DWORD dwFlagsAndAttributes*/ 0,
/*HANDLE hTemplateFile*/ NULL
);
if (file_handle == INVALID_HANDLE_VALUE)
return result;
// NOTE: Allocate buffer
// =========================================================================
uint64_t file_size = (uint64_t)file_attrib_data.nFileSizeHigh << 32 | (uint64_t)file_attrib_data.nFileSizeLow << 0;
S86_ASSERT(file_size < (DWORD)-1);
char *buffer = VirtualAlloc(
/*LPVOID lpAddress*/ NULL,
/*SIZE_T dwSize*/ file_size,
/*DWORD flAllocationType*/ MEM_COMMIT | MEM_RESERVE,
/*DWORD flProtect*/ PAGE_READWRITE
);
if (!buffer)
goto end;
// NOTE: Read file to buffer
// =========================================================================
DWORD bytes_read = 0;
BOOL read_file_result = ReadFile(
/*HANDLE hFile*/ file_handle,
/*LPVOID lpBuffer*/ buffer,
/*DWORD nNumberOfBytesToRead*/ S86_CAST(DWORD)file_size,
/*LPDWORD lpNumberOfBytesRead*/ &bytes_read,
/*LPOVERLAPPED lpOverlapped*/ NULL
);
// NOTE: Handle read result
// =========================================================================
if (read_file_result == 0) {
VirtualFree(buffer, 0, MEM_RELEASE);
} else {
result.data = buffer;
result.size = file_size;
}
end:
CloseHandle(file_handle);
return result;
};
void S86_FileFree(S86_Buffer buffer)
{
if (S86_BufferIsValid(buffer))
VirtualFree(buffer.data, 0, MEM_RELEASE);
}
void S86_Print(S86_Str8 string)
{
if (s86_globals.stdout_handle == NULL) {
s86_globals.stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD mode = 0;
BOOL get_console_mode_result = GetConsoleMode(
/*HANDLE hConsoleHandle*/ s86_globals.stdout_handle,
/*LPDWORD lpMode*/ &mode
);
s86_globals.write_to_console = get_console_mode_result != 0;
}
S86_ASSERT(string.size < S86_CAST(DWORD)-1);
if (s86_globals.write_to_console) {
DWORD chars_written = 0;
WriteConsoleA(s86_globals.stdout_handle, string.data, (DWORD)string.size, &chars_written, NULL);
} else {
DWORD bytes_written = 0;
WriteFile(s86_globals.stdout_handle, string.data, (DWORD)string.size, &bytes_written, NULL);
}
}
void S86_PrintFmt(char const *fmt, ...)
{
va_list args, args_copy;
va_start(args, fmt);
va_copy(args_copy, args);
int string_size = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
char buffer[8192];
S86_ASSERT(string_size >= 0 && string_size < S86_ARRAY_UCOUNT(buffer));
if (string_size) {
vsnprintf(buffer, sizeof(buffer), fmt, args);
S86_Str8 string = {.data = buffer, .size = string_size};
S86_Print(string);
}
va_end(args);
}
void S86_PrintLn(S86_Str8 string)
{
S86_Print(string);
S86_Print(S86_STR8("\n"));
}
void S86_PrintLnFmt(char const *fmt, ...)
{
va_list args, args_copy;
va_start(args, fmt);
va_copy(args_copy, args);
int string_size = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
char buffer[8192];
S86_ASSERT(string_size >= 0 && string_size < S86_ARRAY_UCOUNT(buffer));
if (string_size) {
vsnprintf(buffer, sizeof(buffer), fmt, args);
S86_Str8 string = {.data = buffer, .size = string_size};
S86_PrintLn(string);
}
va_end(args);
}

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part1/sim8086_stdlib.h Normal file
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#define WIN32_MEAN_AND_LEAN
#define NOMINMAX
#include <Windows.h>
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
// NOTE: Macros
// ============================================================================
#define S86_STRINGIFY2(token) #token
#define S86_STRINGIFY(token) S86_STRINGIFY2(token)
#define S86_ASSERT(expr) \
if (!(expr)) { \
S86_PrintLnFmt("Assertion triggered [file=\"" __FILE__ ":" S86_STRINGIFY(__LINE__) "\", expr=\"" #expr "\"]"); \
__debugbreak(); \
} \
#define S86_ARRAY_UCOUNT(array) sizeof((array)) / sizeof((array)[0])
#define S86_CAST(Type) (Type)
// NOTE: Globals
// ============================================================================
typedef struct S86_Globals {
HANDLE stdout_handle;
bool write_to_console;
} S86_Globals;
S86_Globals s86_globals;
// NOTE: Strings
// ============================================================================
typedef struct S86_Str8 {
char *data;
size_t size;
} S86_Str8;
#define S86_STR8(string) (S86_Str8){.data = (string), .size = S86_ARRAY_UCOUNT(string) - 1 }
#define S86_STR8_FMT(string) (int)((string).size), (string).data
// NOTE: Buffer
// ============================================================================
typedef struct S86_Buffer {
char *data;
size_t size;
} S86_Buffer;
typedef struct S86_BufferIterator {
S86_Buffer buffer;
size_t index;
} S86_BufferIterator;
bool S86_BufferIsValid(S86_Buffer buffer);
S86_BufferIterator S86_BufferIteratorInit(S86_Buffer buffer);
bool S86_BufferIteratorHasMoreBytes(S86_BufferIterator it);
uint8_t S86_BufferIteratorNextByte(S86_BufferIterator *it);
// NOTE: File
// ============================================================================
S86_Buffer S86_FileRead(char const *file_path);
void S86_FileFree(S86_Buffer buffer);
// NOTE: Print
// ============================================================================
void S86_PrintLn(S86_Str8 string);
void S86_PrintLnFmt(char const *fmt, ...);