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eaxhla/source/assembler.c
xolatile bb468d1ac4 Refactored special II instructions...
2024-07-20 20:25:11 -04:00

545 lines
16 KiB
C
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#include "assembler.h"
#include <stdlib.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 (WAIT)
#define SPECIAL_2_BEGIN (SYSENTER)
#define SPECIAL_2_END (FCOS)
#define JUMP_IF_BEGIN (JO)
#define JUMP_IF_END (JG)
#define MOVE_IF_BEGIN (CMOVO)
#define MOVE_IF_END (CMOVG)
#define FLOAT_BEGIN (FADD)
#define FLOAT_END (FDIVR)
static int assemble_clean_up_queued = 0;
static unsigned int empty_count = 0;
static unsigned int empty_holes = 0;
static unsigned int * empty_array = NULL;
static unsigned int * empty_imbue = NULL;
static unsigned int * empty_store = NULL;
static void replace(unsigned char * destination,
unsigned char * source,
unsigned long size) {
while (--size) {
destination [size] = source [size];
}
destination [size] = source [size];
}
static void input( int when,
unsigned int data) {
text_sector_byte[text_sector_size] = (unsigned char) data;
text_sector_size += (unsigned int) when;
}
static void input_by( int when,
unsigned int size,
unsigned int data) {
input((when), (data >> 0) & 0xff);
input((when) && (size >= D16), (data >> 8) & 0xff);
input((when) && (size >= D32), (data >> 16) & 0xff);
input((when) && (size >= D32), (data >> 24) & 0xff);
}
static void asmdirrel( int when,
unsigned int data) {
empty_array[empty_holes] = text_sector_size;
empty_imbue[empty_holes] = data;
empty_holes += (unsigned int) when;
}
static void asmdirmem( int when,
unsigned int code) {
empty_store[code] = text_sector_size;
empty_count += (unsigned int) when;
}
static void asmdirimm( int when,
unsigned int size,
unsigned int data) {
input_by(when, size, data);
}
static void input_at( int when,
unsigned int size,
unsigned int data,
unsigned int base) {
asmdirrel(when, data);
input((when), (base >> 0) & 0xff);
input((when) && (size >= D16), (base >> 8) & 0xff);
input((when) && (size >= D32), (base >> 16) & 0xff);
input((when) && (size >= D32), (base >> 24) & 0xff);
}
static int front(unsigned int data) {
return ((data >= 4) && (data <= 7));
}
static int lower(unsigned int data) {
return (data <= 7);
}
static int upper(unsigned int data) {
return ((data >= 8) && (data <= 15));
}
static int far(unsigned int label) {
return (label && 1);
}
static int near(unsigned int label) {
return (label && 0);
}
static void build_short (int when) {
input(when, 0x66);
}
static void build_long( int registers,
unsigned int to,
unsigned int from) {
input(registers || to || from, 0x40
+ 0x01 * (unsigned int) to
+ 0x04 * (unsigned int) from
+ 0x08 * (unsigned int) registers);
}
static void build_co( int when,
unsigned int destination,
unsigned int source) {
input(when, 0xc0
+ 0x01 * (destination & 0x07)
+ 0x08 * (source & 0x07));
}
static void build_at( int when,
unsigned int direction) {
input(when, 0x05
+ 0x08 * (direction & 0x07));
}
static void build_constant( int when,
unsigned int size) {
input(when, 0x80
+ 0x01 * (size != D8));
}
static void build_regular(unsigned int operation,
unsigned int size,
unsigned int to,
unsigned int destination,
unsigned int from,
unsigned int source) {
build_short(size == D16);
build_long(size == D64,
(to == REG) && (upper(destination)),
(from == REG) && (upper(source)));
input((size == D8) && (to == REG)
&& ((from == REG) || (from == IMM))
&& (((front(destination) && lower(source))
|| (lower(destination) && front(source)))
|| ((to == REG) && (from == IMM) && front(destination))),
0x40);
input((from == IMM) && (to == REG) && (destination == 0), 0x05
+ 0x08 * (operation & 0x07)
- 0x01 * (size == D8));
build_constant((from == IMM)
&& ! ((to == REG) && (destination == 0)),
size);
input(! ((from == IMM) && (to == REG) && (destination == 0)),
(destination & 0x07) * ((to == REG) && (from == IMM))
+ 0x08 * (operation - REGULAR_BEGIN)
+ 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_co((to == REG) && (from == REG), destination, source);
build_at((to == REG) && (from == MEM), destination);
build_at((to == MEM) && (from == REG), source);
input_by((to == REG) && (from == MEM), D32, ~0x0u);
input_by((to == REG) && (from == IMM), size, source);
input_by((to == MEM) && (from == REG), D32, ~0x0u);
input_by((to == MEM) && (from == IMM), D32, ~0x0u);
input_by((to == MEM) && (from == IMM), size, source);
}
static void build_irregular(unsigned int operation,
unsigned int size,
unsigned int to,
unsigned int destination) {
build_short(size == D16);
build_long(size == D64,
(to == REG) && (upper(destination)), 0);
input((size == D8) && (to == REG) && front(destination), 0x40);
input(1, 0xf7
+ 0x08 * ((operation == INC) || (operation == DEC))
- 0x01 * (size == D8));
input(to == REG, 0xc0
+ 0x08 * (operation - IRREGULAR_BEGIN)
+ 0x01 * (destination & 0x07));
input(to == MEM, 0x05
+ 0x08 * (operation - IRREGULAR_BEGIN));
}
static void build_special_1(unsigned int operation) {
const unsigned char data [] = {
0x90, 0xc3, 0xcb, 0xc9, 0xf0, 0xf4, 0x9d, 0x9c, 0x9b
};
input(1, data[operation - SPECIAL_1_BEGIN]);
}
static void build_special_2(unsigned int operation) {
const unsigned short data [] = {
0x340f, 0x350f, 0x050f, 0x070f, 0x90f3, 0xa20f, 0x770f,
0xaa0f, 0xd0d9, 0xe0d9, 0xe1d9, 0xe4d9, 0xe5d9, 0xe8d9,
0xe9d9, 0xead9, 0xebd9, 0xecd9, 0xedd9, 0xeed9, 0xf0d9,
0xf1d9, 0xf2d9, 0xf3d9, 0xf4d9, 0xf5d9, 0xf6d9, 0xf7d9,
0xf8d9, 0xf9d9, 0xfad9, 0xfbd9, 0xfcd9, 0xfdd9, 0xfed9,
0xffd9
};
input_by(1, D16, data[operation - SPECIAL_2_BEGIN]);
}
static void build_jump_if(unsigned int operation,
unsigned int size,
unsigned int location) {
input(far(location) && (size == D32), 0x0f);
input(far(location), 0x80 + operation - JUMP_IF_BEGIN);
input(near(location), 0x70 + operation - JUMP_IF_BEGIN);
}
static void build_move_if(unsigned int operation,
unsigned int size,
unsigned int to,
unsigned int destination,
unsigned int from,
unsigned int source) {
build_short(size == D16);
build_long(size == D64,
(to == REG) && (upper(destination)),
(from == REG) && (upper(source)));
input(1, 0x0f);
input(1, 0x40 + operation - MOVE_IF_BEGIN);
build_co((to == REG) && (from == REG), destination, source);
build_at((to == REG) && (from == MEM), destination);
}
static void build_jump(unsigned int size,
unsigned int to,
unsigned int destination) {
input((to == REG) && upper(destination), 0X41);
input(to == REL, 0xe9 + 0x02 * (size == D8));
input(to == REG, 0xff);
input(to == REG, 0xe0 + 0x01 * (destination & 0x07));
input(to == MEM, 0xff);
input(to == MEM, 0x25);
input_at(to == REL, D32, destination, -(text_sector_size + 4));
input_at(to == MEM, D32, destination, 0x4010b0);
}
static void build_move(unsigned int size,
unsigned int to,
unsigned int destination,
unsigned int from,
unsigned int source) {
build_short(size == D16);
build_long(size == D64,
(to == REG) && (upper(destination)),
(from == REG) && (upper(source)));
input((to == REG) && (from == REG), 0x88 + (size != D8));
input((to == REG) && (from == MEM), 0x8a + (size != D8));
input((to == MEM) && (from == REG), 0x88 + (size != D8));
build_at((to == REG) && (from == MEM), destination);
build_at((to == MEM) && (from == REG), source);
input((to == REG) && ((from == IMM) || (from == REL)), 0xb8
+ 0x01 * (destination & 0x07));
input((to == MEM) && (from == IMM), 0xc6 + (size != D8));
input((to == MEM) && (from == IMM), 0x05);
input_at((to == REG) && (from == MEM), D32, source, 0);
input_by((to == REG) && (from == IMM), size, source);
input_at((to == MEM) && (from == REG), D32, ~0x0u, ~0x0u);
input_at((to == MEM) && (from == IMM), D32, ~0x0u, ~0x0u);
input_by((to == MEM) && (from == IMM), size, source);
input_at((to == REG) && (from == REL), D32, source, 0x4010b0);
}
static void build_call(unsigned int from,
unsigned int source) {
input((from == REG) && (upper(source)), 0x41);
input(from == REL, 0xe8);
input(from == REG, 0xff);
input_at(from == REL, D32, source, -(text_sector_size + 4));
input(from == REG, (0xd0 + 0x01 * (source & 0x07)));
}
static void build_enter(unsigned int dynamic_storage,
unsigned int nesting_level) {
input(1, 0xc8);
input_by(1, D16, dynamic_storage);
input_by(1, D8, nesting_level & 0x1f);
}
static void build_in_out(unsigned int move,
unsigned int size,
unsigned int type,
unsigned int port) {
build_short(size == D16);
input(1, 0xe4
+ 0x01 * (size != D8)
+ 0x02 * (move != OUT)
+ 0x08 * (type == REG));
input_by(type == IMM, D8, port);
}
static void build_pop(unsigned int size,
unsigned int to,
unsigned int destination) {
build_short(size == D16);
input((to == REG) && (upper(destination)), 0x41);
input(to == REG, 0x58 + 0x01 * (destination & 0x07));
input(to == MEM, 0x8f);
input(to == MEM, 0x05);
input_at(to == MEM, D32, destination, 0);
}
static void build_push(unsigned int size,
unsigned int from,
unsigned int source) {
build_short(size == D16);
input((from == REG) && (upper(source)), 0x41);
input(from == REG, 0x50 + 0x01 * (source & 0x07));
input(from == MEM, 0xff);
input(from == MEM, 0x35);
input(from == IMM, 0x68 + 0x02 * (size == D8));
input_at(from == MEM, D32, source, 0);
input_by(from == IMM, size, source);
}
static void build_float(unsigned int operation,
unsigned int size,
unsigned int from,
unsigned int source) {
input(from == MEM, 0xd8 + 0x04 * (size == D64));
build_at(from == MEM, operation);
input_at(from == MEM, size, source, 0);
}
static void assemble_clean_up (void) {
if (!assemble_clean_up_queued) {
return;
}
free(text_sector_byte);
free(empty_array);
free(empty_imbue);
free(empty_store);
}
unsigned int text_sector_size = 0;
unsigned char * text_sector_byte = NULL;
int was_instruction_array_empty = 0;
unsigned int text_entry_point = 0;
void assemble(unsigned int count,
unsigned int * array) {
unsigned int index = 0;
if ((count == 0) || (array == NULL)) {
was_instruction_array_empty = 1;
return;
}
text_sector_byte = calloc(4096UL, sizeof(* text_sector_byte));
empty_array = calloc(1024UL, sizeof(* empty_array));
empty_imbue = calloc(1024UL, sizeof(* empty_imbue));
empty_store = calloc(1024UL, sizeof(* empty_store));
if (!assemble_clean_up_queued) {
atexit(assemble_clean_up);
assemble_clean_up_queued = !assemble_clean_up_queued;
}
while (index < count) {
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) {
unsigned int repeat = 0;
while (repeat < array[index + 2]) {
asmdirimm(1, array[index + 1],
array[index + 3 + repeat]);
++repeat;
}
index += array[index + 2] + 2;
} 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] >= FLOAT_BEGIN)
&& (array[index] <= FLOAT_END)) {
build_float(array[index + 0],
array[index + 1],
array[index + 2],
array[index + 3]);
index += 3;
} 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]);
index += 5;
} else if (array[index] == CALL) {
build_call(array[index + 1],
array[index + 2]);
index += 2;
} else if (array[index] == ENTER) {
build_enter(array[index + 1],
array[index + 2]);
index += 2;
} else if ((array[index] == IN)
|| (array[index] == OUT)) {
build_in_out(array[index + 0],
array[index + 1],
array[index + 2],
array[index + 3]);
index += 3;
} else if (array[index] == POP) {
build_pop(array[index + 1],
array[index + 2],
array[index + 3]);
index += 3;
} else if (array[index] == PUSH) {
build_push(array[index + 1],
array[index + 2],
array[index + 3]);
index += 3;
} else {
return;
}
++index;
}
text_entry_point = empty_store [0];
index = 0;
while (index < empty_holes) {
unsigned int set = 0;
unsigned int get = empty_array[index];
replace((unsigned char *) & set,
& text_sector_byte[get],
sizeof (set));
set += empty_store[empty_imbue[index]];
replace(& text_sector_byte[get],
(unsigned char *) & set,
sizeof (set));
++index;
}
}
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