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87dc21c591
eaxhla/source/assembler.c
xolatile 87dc21c591 Updates...
2024-07-15 18:25:49 -04:00

419 lines
14 KiB
C
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#include "assembler.h"
#include <stdlib.h>
#include <string.h>
#define REGULAR_BEGIN (ADD)
#define REGULAR_END (CMP)
#define IRREGULAR_BEGIN (INC)
#define IRREGULAR_END (IDIV)
#define SPECIAL_1_BEGIN (NOP)
#define SPECIAL_1_END (HLT)
#define SPECIAL_2_BEGIN (SYSENTER)
#define SPECIAL_2_END (CPUID)
#define JUMP_IF_BEGIN (JO)
#define JUMP_IF_END (JG)
#define MOVE_IF_BEGIN (CMOVO)
#define MOVE_IF_END (CMOVG)
#define REGULAR_COUNT (REGULAR_END - REGULAR_BEGIN + 1)
#define IRREGULAR_COUNT (IRREGULAR_END - IRREGULAR_BEGIN + 1)
#define SPECIAL_1_COUNT (SPECIAL_1_END - SPECIAL_1_BEGIN + 1)
#define SPECIAL_2_COUNT (SPECIAL_2_END - SPECIAL_2_BEGIN + 1)
#define JUMP_IF_COUNT (JUMP_IF_END - JUMP_IF_BEGIN + 1)
#define MOVE_IF_COUNT (MOVE_IF_END - MOVE_IF_BEGIN + 1)
// Regulates displacement, immediate, label, variable, constant, string data.
#define TESTING_FOR_NOW (4)
static next empty_count = 0;
static next empty_holes = 0;
static next empty_array [TESTING_FOR_NOW] = { 0 };
static next empty_imbue [TESTING_FOR_NOW] = { 0 };
static next empty_store [TESTING_FOR_NOW] = { 0 };
// Main function.
static void place (form when,
byte data) {
/* */
text_sector_byte [text_sector_size] = data;
text_sector_size += (next) when;
}
static void print (form when,
size_index size,
next data) {
/* */
place ((when != 0) && (size >= D8), (byte) ((data >> 0) & 0xff));
place ((when != 0) && (size >= D16), (byte) ((data >> 8) & 0xff));
place ((when != 0) && (size >= D32), (byte) ((data >> 16) & 0xff));
place ((when != 0) && (size >= D32), (byte) ((data >> 24) & 0xff));
/* 64-BIT SUPPORT */
}
static void asmdirrel (form when,
next data) {
/* */
if (empty_holes >= TESTING_FOR_NOW) exit (69);
empty_array [empty_holes] = text_sector_size;
empty_imbue [empty_holes] = data;
empty_holes += (next) when;
}
static void asmdirmem (form when,
next code) {
/* */
if (code >= TESTING_FOR_NOW) exit (69);
empty_store [code] = text_sector_size;
empty_count += (next) when;
}
static void delay (form when,
size_index size,
next data) {
/* */
asmdirrel (when, data);
place ((when != 0) && (size >= D8), (byte) 0xb0);
place ((when != 0) && (size >= D16), (byte) 0x10);
place ((when != 0) && (size >= D32), (byte) 0x40);
place ((when != 0) && (size >= D32), (byte) 0x00);
/* NO DEREFERENCING */
/* 64-BIT SUPPORT */
}
static void asmdirimm (form when,
size_index size,
//~next redo,
next data) {
/* */
//~next i;
//~for (i = 0; i < redo; ++i) {
print (when, size, data);
//~}
}
static form front (form data) { return ((data >= 4) && (data <= 7)); }
static form lower (form data) { return ((data >= 0) && (data <= 7)); }
static form upper (form data) { return ((data >= 8) && (data <= 15)); }
// Important stuff that I need to handle later, it saves bytes!
static form far (next label) { return (label && 1); }
static form near (next label) { return (label && 0); }
static void build_short_prefix (form when) {
place (when, 0x66);
}
// 40-4D!0X02
static void build_long_prefix (form use_big_registers,
form use_new_destination,
form use_new_source) {
/* */
place (use_big_registers || use_new_destination || use_new_source,
(byte) (0x40
+ 0x01 * use_new_destination
+ 0x04 * use_new_source
+ 0x08 * use_big_registers));
}
// C0-FF
static void build_register_direction (form when,
next destination,
next source) {
/* */
place (when, (byte) (0xc0
+ 0x01 * (destination & 0x07)
+ 0x08 * (source & 0x07)));
}
// 05-3D
static void build_register_redirection (form when,
next direction) {
/* */
place (when, (byte) (0x05
+ 0x08 * (direction & 0x07)));
}
// 80/81
static void build_constant (form when,
size_index size) {
/* */
place (when, (byte) (0x80
+ 0x01 * (size != D8)));
}
// REGULAR_BEGIN-REGULAR_END D8-D64 REG/MEM R0-R15/MEM -||-/IMM -||-/IMM
static void build_regular (operation_index operation,
size_index size,
type_index to,
next destination,
type_index from,
next source) {
/* */
build_short_prefix (size == D16);
build_long_prefix (size == D64,
(to == REG) && (upper ((form) destination)),
(from == REG) && (upper ((form) source)));
// 40>front
place ((size == D8) && (to == REG) && ((from == REG) || (from == IMM))
&& (((front ((form) destination) && lower ((form) source))
|| (lower ((form) destination) && front ((form) source))) ||
((to == REG) && (from == IMM) && front ((form) destination))),
(byte) 0x40);
place ((from == IMM) && (to == REG) && (destination == 0),
(byte) (0x05
+ 0x08 * (operation & 0x07))
- 0x01 * (size == D8));
build_constant ((from == IMM) && ! ((to == REG) && (destination == 0)), size);
place (! ((from == IMM) && (to == REG) && (destination == 0)),
(byte) (0x08 * (operation - REGULAR_BEGIN)
+ (destination & 0x07) * ((to == REG) && (from == IMM))
+ 0x01 * ((to == MEM) && (from == IMM) && (size == D8)) //
- 0x01 * ((to == REG) && (from == IMM) && (size != D8)) //
+ 0x01 * (size != D8)
+ 0x02 * ((to == REG) && (from == MEM))
+ 0x04 * ((to == MEM) && (from == IMM))
+ 0xc0 * ((to == REG) && (from == IMM))));
build_register_direction ((to == REG) && (from == REG),
destination, source);
build_register_redirection ((to == REG) && (from == MEM), destination);
build_register_redirection ((to == MEM) && (from == REG), source);
print ((to == REG) && (from == MEM), D32, (next) ~0);
print ((to == REG) && (from == IMM), size, source);
print ((to == MEM) && (from == REG), D32, (next) ~0);
print ((to == MEM) && (from == IMM), D32, (next) ~0);
print ((to == MEM) && (from == IMM), size, source);
}
// IRREGULAR_BEGIN-IRREGULAR_END D8-D64 REG/MEM R0-R15/MEM
static void build_irregular (operation_index operation,
size_index size,
type_index to,
next destination) {
/* */
build_short_prefix (size == D16);
build_long_prefix (size == D64,
(to == REG) && (upper ((form) destination)), 0);
// 40>front
place ((size == D8) && (to == REG) && front ((form) destination), (byte) 0x40);
place (1, (byte) (0xf7
+ 0x08 * ((operation == INC) || (operation == DEC))
- 0x01 * (size == D8)));
place (to == REG, (byte) (0xc0
+ 0x08 * (operation - IRREGULAR_BEGIN))
+ 0x01 * (destination & 0x07));
place (to == MEM, (byte) (0x05
+ 0x08 * (operation - IRREGULAR_BEGIN)));
}
// SPECIAL_1_BEGIN-SPECIAL_1_END
static void build_special_1 (operation_index operation) {
const byte data [1 * SPECIAL_1_COUNT] = {
0x90, 0xc3, 0xcb, 0xc9, 0xf0, 0xf4
};
place (1, data [operation - SPECIAL_1_BEGIN]);
}
// SPECIAL_2_BEGIN-SPECIAL_2_END
static void build_special_2 (operation_index operation) {
const byte data [2 * SPECIAL_2_COUNT] = {
0x0f, 0x0f, 0x0f, 0x0f, 0xf3, 0x0f,
0x34, 0x35, 0x05, 0x07, 0x90, 0xa2
};
place (1, data [operation - SPECIAL_2_BEGIN]);
place (1, data [operation - SPECIAL_2_BEGIN + SPECIAL_2_COUNT]);
}
// JUMP_IF_BEGIN-JUMP_IF_END D8/32 IMM8/32
static void build_jump_if (operation_index operation,
size_index size,
next location) {
/* */
(void) size; /* HIGHLY DEPENDS FOR FAR AND NEAR JUMPS! */
place (far (location), 0x0f); /* EVERYTHING IS FAR JUMP! */
place (far (location), (byte) (0x80 + operation - JUMP_IF_BEGIN));
place (near (location), (byte) (0x70 + operation - JUMP_IF_BEGIN));
//~displacement (4, 0X12345678);
}
// MOVE_IF_BEGIN-MOVE_IF_END D16-D64 REG R0-R15 -||-/MEM -||-/MEM
static void build_move_if (operation_index operation,
size_index size,
type_index to,
next destination,
type_index from,
next source) {
/* */
build_short_prefix (size == D16);
build_long_prefix (size == D64,
(to == REG) && (upper ((form) destination)),
(from == REG) && (upper ((form) source)));
place (1, 0x0f);
place (1, (byte) (0x40 + operation - MOVE_IF_BEGIN));
build_register_direction ((to == REG) && (from == REG),
destination, source);
build_register_redirection ((to == REG) && (from == MEM), destination);
//~displacement (4, 0X12345678); // Not implemented at this point!
}
// SPECIAL!
static void build_jump (size_index size,
type_index to,
next destination) {
/* */
place ((to == REG) && upper ((form) destination), (byte) 0X41);
place (to == REL, (byte) (0xe9 + 0x02 * (size == D8)));
place (to == REG, (byte) 0xff);
place (to == REG, (byte) (0xe0 + 0x01 * (destination & 0x07)));
place (to == MEM, (byte) 0xff);
place (to == MEM, (byte) 0x25);
//~displacement (to == MEM, 4, 0x12345678); // Keep when in mind!
}
// VERY FUCKING SPECIAL!
static void build_move (size_index size,
type_index to,
next destination,
type_index from,
next source) {
/* */
build_short_prefix (size == D16);
build_long_prefix (size == D64,
(to == REG) && (upper ((form) destination)),
(from == REG) && (upper ((form) source)));
place ((to == REG) && (from == REG), (byte) (0x88 + (size != D8)));
place ((to == REG) && (from == MEM), (byte) (0x8a + (size != D8)));
place ((to == MEM) && (from == REG), (byte) (0x88 + (size != D8)));
build_register_redirection ((to == REG) && (from == MEM), destination);
build_register_redirection ((to == MEM) && (from == REG), source);
place ((to == REG) && ((from == IMM) || (from == REL)), (byte) (0xb8
//~+ 0x08 * (size != D8)
+ 0x01 * (destination & 0x07)));
place ((to == MEM) && (from == IMM), (byte) (0xc6 + (size != D8)));
place ((to == MEM) && (from == IMM), (byte) (0x05));
delay ((to == REG) && (from == MEM), D32, source);
print ((to == REG) && (from == IMM), size, source);
delay ((to == MEM) && (from == REG), D32, (next) ~0);
delay ((to == MEM) && (from == IMM), D32, (next) ~0);
print ((to == MEM) && (from == IMM), size, source);
delay ((to == REG) && (from == REL), D32, source);
}
next text_sector_size = 0;
byte * text_sector_byte = NULL;
int was_instruction_array_empty = 0;
void assemble (next count,
next * array) {
/* */
next index;
if ((count == 0) || (array == NULL)) {
was_instruction_array_empty = 1;
return;
}
for (index = 0; index < count; ++index) {
if (array [index] == ASMDIRREL) {
asmdirrel (1, array [index + 1]);
index += 1;
} else if (array [index] == ASMDIRMEM) {
asmdirmem (1, array [index + 1]);
index += 1;
} else if (array [index] == ASMDIRIMM) {
asmdirimm (1, array [index + 1], array [index + 2]);
index += 2;
//~} else if (array [index] == ASMDIRREP) {
} else if ((array [index] >= REGULAR_BEGIN)
&& (array [index] <= REGULAR_END)) {
build_regular (array [index + 0], array [index + 1],
array [index + 2], array [index + 3],
array [index + 4], array [index + 5]);
index += 5;
} else if ((array [index] >= IRREGULAR_BEGIN)
&& (array [index] <= IRREGULAR_END)) {
build_irregular (array [index + 0], array [index + 1],
array [index + 2], array [index + 3]);
index += 3;
} else if ((array [index] >= SPECIAL_1_BEGIN)
&& (array [index] <= SPECIAL_1_END)) {
build_special_1 (array [index + 0]);
index += 0;
} else if ((array [index] >= SPECIAL_2_BEGIN)
&& (array [index] <= SPECIAL_2_END)) {
build_special_2 (array [index + 0]);
index += 0;
} else if ((array [index] >= JUMP_IF_BEGIN)
&& (array [index] <= JUMP_IF_END)) {
build_jump_if (array [index + 0], array [index + 1],
array [index + 2]);
index += 2;
} else if ((array [index] >= MOVE_IF_BEGIN)
&& (array [index] <= MOVE_IF_END)) {
build_move_if (array [index + 0], array [index + 1],
array [index + 2], array [index + 3],
array [index + 4], array [index + 5]);
index += 5;
} else if (array [index] == JMP) {
build_jump (array [index + 1], array [index + 2],
array [index + 3]);
index += 3;
} else if (array [index] == MOV) {
build_move (array [index + 1], array [index + 2],
array [index + 3], array [index + 4],
array [index + 5]);
printf ("MOV %i %i %i %i %i\n",
array [index + 1], array [index + 2],
array [index + 3], array [index + 4],
array [index + 5]);
index += 5;
} else {
//~exit (array [index]); // For debugging only!
}
}
for (index = 0; index < empty_holes; ++index) {
next set = 0, get = empty_array [index];
memcpy (& set, & text_sector_byte [get], sizeof (set));
set += empty_store [empty_imbue [index]];
memcpy (& text_sector_byte [get], & set, sizeof (set));
}
}
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