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perfware/part1: Get listing_0037 working

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doyle 2023-03-06 22:06:55 +11:00 committed by committed-name
parent 3601436777
commit f5346147e2
3 changed files with 106 additions and 45 deletions
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21
part1/build.bat
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@ -1,16 +1,31 @@
@echo off
REM Setup
REM ===========================================================================
set script_dir_backslash=%~dp0
set script_dir=%script_dir_backslash:~0,-1%
set build_dir=%script_dir%\build
if not exist %build_dir% mkdir %build_dir%
pushd build
copy /Y %script_dir%\listing_0037_single_register_mov %build_dir% 1>NUL
copy /Y %script_dir%\listing_0038_many_register_mov %build_dir% 1>NUL
copy /Y %script_dir%\listing_0039_more_movs %build_dir% 1>NUL
copy /Y %script_dir%\listing_0040_challenge_movs %build_dir% 1>NUL
REM Build
REM ===========================================================================
pushd %build_dir%
cl %script_dir%\sim8086.c /W4 /WX /Z7 /nologo
popd
REM Tests
REM ===========================================================================
set listing_0037=%build_dir%\listing_0037_single_register_mov
%build_dir%\sim8086.exe %listing_0037% > %listing_0037%_disassembled.asm
nasm %listing_0037%_disassembled.asm
fc %listing_0037% %listing_0037%_disassembled || exit /b 1
set listing_0038=%build_dir%\listing_0038_many_register_mov
%build_dir%\sim8086.exe %listing_0038% > %listing_0038%_disassembled.asm
nasm %listing_0038%_disassembled.asm
fc %listing_0038% %listing_0038%_disassembled || exit /b 1

124
part1/sim8086.c
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@ -22,16 +22,28 @@ struct S86_Str8 {
typedef struct S86_Globals S86_Globals;
struct S86_Globals {
HANDLE stdout_handle;
bool write_to_console;
};
S86_Globals s86_globals;
#define S86_ASSERT(expr) if (!(expr)) { __debugbreak(); }
#define S86_ARRAY_UCOUNT(array) sizeof((array))/sizeof((array)[0])
#define S86_STRINGIFY2(token) #token
#define S86_STRINGIFY(token) S86_STRINGIFY2(token)
#define S86_ASSERT(expr) \
if (!(expr)) { \
S86_PrintLnFmt("Assertion triggered [file=" __FILE__ ", line=" S86_STRINGIFY(__LINE__) ", expr=" #expr "]"); \
__debugbreak(); \
} \
#define S86_ARRAY_UCOUNT(array) sizeof((array)) / sizeof((array)[0])
#define S86_STR8(string) (S86_Str8){.data = (string), .size = S86_ARRAY_UCOUNT(string) - 1 }
#define S86_STR8_FMT(string) (int)((string).size), (string).data
#define S86_CAST(Type) (Type)
S86_Buffer S86_ReadFile(char const *file_path);
void S86_PrintLn(S86_Str8 string);
void S86_PrintLnFmt(char const *fmt, ...);
S86_Buffer S86_ReadFile(char const *file_path)
{
S86_Buffer result = {0};
@ -104,13 +116,27 @@ bool S86_BufferIsValid(S86_Buffer buffer)
void S86_PrintLn(S86_Str8 string)
{
if (s86_globals.stdout_handle == NULL)
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);
WriteConsoleA(s86_globals.stdout_handle, "\n", 1, &chars_written, NULL);
} else {
DWORD bytes_written = 0;
WriteFile(s86_globals.stdout_handle, string.data, (DWORD)string.size, &bytes_written, NULL);
WriteFile(s86_globals.stdout_handle, "\n", 1, &bytes_written, NULL);
}
}
void S86_PrintLnFmt(char const *fmt, ...)
@ -141,31 +167,6 @@ enum S86_ModEncoding {
S86_ModEncoding_RegisterMode = 0b11,
};
S86_Str8 REGISTER_FIELD_ENCODING[2][8] = {
[0b0] =
{
S86_STR8("AL"),
S86_STR8("CL"),
S86_STR8("DL"),
S86_STR8("BL"),
S86_STR8("AH"),
S86_STR8("CH"),
S86_STR8("DH"),
S86_STR8("BH"),
},
[0b1] =
{
S86_STR8("AX"),
S86_STR8("CX"),
S86_STR8("DX"),
S86_STR8("BX"),
S86_STR8("SP"),
S86_STR8("BP"),
S86_STR8("SI"),
S86_STR8("DI"),
},
};
typedef enum S86_InstructionType S86_InstructionType;
enum S86_InstructionType {
S86_InstructionType_MOVRegOrMemToOrFromReg,
@ -183,13 +184,26 @@ struct S86_Instruction {
uint16_t op_mask;
uint16_t op_bits;
} S86_INSTRUCTIONS[S86_InstructionType_Count] = {
[S86_InstructionType_MOVRegOrMemToOrFromReg] = {.op_mask = 0b1111'1100'0000'0000, .op_bits = 0b1000'1000'0000'0000},
[S86_InstructionType_MOVImmediateToRegOrMem] = {.op_mask = 0b1111'1110'0011'1000, .op_bits = 0b1100'0110'0000'0000},
[S86_InstructionType_MOVImmediateToReg] = {.op_mask = 0b1111'0000'0000'0000, .op_bits = 0b1011'0000'0000'0000},
[S86_InstructionType_MOVMemToAccum] = {.op_mask = 0b1111'1110'0000'0000, .op_bits = 0b1010'0000'0000'0000},
[S86_InstructionType_MOVAccumToMem] = {.op_mask = 0b1111'1110'0000'0000, .op_bits = 0b1010'0010'0000'0000},
[S86_InstructionType_MOVRegOrMemToSegReg] = {.op_mask = 0b1111'1111'0010'0000, .op_bits = 0b1000'1110'0000'0000},
[S86_InstructionType_MOVSegRegToRegOrMem] = {.op_mask = 0b1111'1111'0010'0000, .op_bits = 0b1000'1100'0000'0000},
[S86_InstructionType_MOVRegOrMemToOrFromReg] = {.op_mask = 0b1111'1100'0000'0000,
.op_bits = 0b1000'1000'0000'0000},
[S86_InstructionType_MOVImmediateToRegOrMem] = {.op_mask = 0b1111'1110'0011'1000,
.op_bits = 0b1100'0110'0000'0000},
[S86_InstructionType_MOVImmediateToReg] = {.op_mask = 0b1111'0000'0000'0000,
.op_bits = 0b1011'0000'0000'0000},
[S86_InstructionType_MOVMemToAccum] = {.op_mask = 0b1111'1110'0000'0000,
.op_bits = 0b1010'0000'0000'0000},
[S86_InstructionType_MOVAccumToMem] = {.op_mask = 0b1111'1110'0000'0000,
.op_bits = 0b1010'0010'0000'0000},
[S86_InstructionType_MOVRegOrMemToSegReg] = {.op_mask = 0b1111'1111'0010'0000,
.op_bits = 0b1000'1110'0000'0000},
[S86_InstructionType_MOVSegRegToRegOrMem] = {.op_mask = 0b1111'1111'0010'0000,
.op_bits = 0b1000'1100'0000'0000},
};
typedef enum S86_OpDataSize S86_OpDataSize;
@ -202,6 +216,31 @@ int main(int argc, char **argv)
return -1;
}
S86_Str8 const REGISTER_FIELD_ENCODING[2][8] = {
[0b0] =
{
S86_STR8("al"),
S86_STR8("cl"),
S86_STR8("dl"),
S86_STR8("bl"),
S86_STR8("ah"),
S86_STR8("ch"),
S86_STR8("dh"),
S86_STR8("bh"),
},
[0b1] =
{
S86_STR8("ax"),
S86_STR8("cx"),
S86_STR8("dx"),
S86_STR8("bx"),
S86_STR8("sp"),
S86_STR8("bp"),
S86_STR8("si"),
S86_STR8("di"),
},
};
char const *file_path = argv[1];
S86_Buffer buffer = S86_ReadFile(file_path);
if (!S86_BufferIsValid(buffer)) {
@ -209,10 +248,12 @@ int main(int argc, char **argv)
return -1;
}
S86_PrintLn(S86_STR8("bits 16"));
S86_ASSERT(buffer.size % 2 == 0); // We expect 2 byte instructions
for (size_t buffer_index = 0; buffer_index < (buffer.size / 2); buffer_index++) {
char byte0 = buffer.data[buffer_index + 0];
char byte1 = buffer.data[buffer_index + 1];
uint8_t byte0 = (uint8_t)buffer.data[buffer_index + 0];
uint8_t byte1 = (uint8_t)buffer.data[buffer_index + 1];
uint16_t byte01 = (uint16_t)byte0 << 8 | (uint16_t)byte1 << 0;
for (size_t instruction_index = 0;
@ -231,17 +272,22 @@ int main(int argc, char **argv)
uint8_t mod = (byte1 & 0b1100'0000) >> 6;
uint8_t reg = (byte1 & 0b0011'1000) >> 3;
uint8_t rm = (byte1 & 0b0000'0111) >> 0;
S86_ASSERT(d < 2);
S86_ASSERT(w < 2);
S86_ASSERT(mod < 4);
S86_ASSERT(reg < 8);
S86_ASSERT(rm < 8);
uint8_t instr_dest = d ? reg : rm;
uint8_t instr_src = d ? rm : reg;
S86_OpDataSize data_size = w ? S86_OpDataSize_Word : S86_OpDataSize_Byte;
// S86_OpDataSize data_size = w ? S86_OpDataSize_Word : S86_OpDataSize_Byte;
S86_ASSERT(mod == 0b11); // register-to-register
S86_Str8 src_register = REGISTER_FIELD_ENCODING[w][instr_src];
S86_Str8 dest_register = REGISTER_FIELD_ENCODING[w][instr_dest];
S86_PrintLnFmt("MOV %.*s %.*s", S86_STR8_FMT(src_register), S86_STR8_FMT(dest_register));
S86_PrintLnFmt("mov %.*s, %.*s", S86_STR8_FMT(dest_register), S86_STR8_FMT(src_register));
#if 0
if (mod == 0b01) {

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