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cpu.c
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cpu.c
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#include <stdio.h>
#include <stdnoreturn.h>
#include <string.h>
#include <setjmp.h>
#include <stdlib.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <spiram.h>
#include "cpu.h"
#include "disk.h"
#include "smolrom.h"
typedef fox32_err_t err_t;
typedef fox32_io_read_t io_read_t;
typedef fox32_io_write_t io_write_t;
static int io_read_default_impl(void *user, uint32_t *value, uint32_t port) {
return (void) user, (void) value, (int) port;
}
static int io_write_default_impl(void *user, uint32_t value, uint32_t port) {
if (port == 0) {
putchar((int) value);
fflush(stdout);
}
return (void) user, (int) port;
}
static io_read_t *const io_read_default = io_read_default_impl;
static io_write_t *const io_write_default = io_write_default_impl;
enum {
OP_NOP = 0x00,
OP_ADD = 0x01,
OP_MUL = 0x02,
OP_AND = 0x03,
OP_SLA = 0x04,
OP_SRA = 0x05,
OP_BSE = 0x06,
OP_CMP = 0x07,
OP_JMP = 0x08,
OP_RJMP = 0x09,
OP_PUSH = 0x0A,
OP_IN = 0x0B,
OP_ISE = 0x0C,
OP_MSE = 0x0D,
OP_HALT = 0x10,
OP_INC = 0x11,
OP_OR = 0x13,
OP_IMUL = 0x14,
OP_SRL = 0x15,
OP_BCL = 0x16,
OP_MOV = 0x17,
OP_CALL = 0x18,
OP_RCALL = 0x19,
OP_POP = 0x1A,
OP_OUT = 0x1B,
OP_ICL = 0x1C,
OP_MCL = 0x1D,
OP_BRK = 0x20,
OP_SUB = 0x21,
OP_DIV = 0x22,
OP_XOR = 0x23,
OP_ROL = 0x24,
OP_ROR = 0x25,
OP_BTS = 0x26,
OP_MOVZ = 0x27,
OP_LOOP = 0x28,
OP_RLOOP = 0x29,
OP_RET = 0x2A,
OP_INT = 0x2C,
OP_TLB = 0x2D,
OP_DEC = 0x31,
OP_REM = 0x32,
OP_NOT = 0x33,
OP_IDIV = 0x34,
OP_IREM = 0x35,
OP_ICMP = 0x37,
OP_RTA = 0x39,
OP_RETI = 0x3A,
OP_FLP = 0x3D,
};
enum {
SZ_BYTE,
SZ_HALF,
SZ_WORD
};
#define OP(_size, _optype) (((uint8_t) (_optype)) | (((uint8_t) (_size)) << 6))
enum {
CD_ALWAYS,
CD_IFZ,
CD_IFNZ,
CD_IFC,
CD_IFNC,
CD_IFGT,
CD_IFLTEQ
};
enum {
TY_REG,
TY_REGPTR,
TY_IMM,
TY_IMMPTR,
TY_NONE
};
enum {
EX_DIVZERO = 256 + 0x00,
EX_ILLEGAL = 256 + 0x01,
EX_FAULT_RD = 256 + 0x02,
EX_FAULT_WR = 256 + 0x03,
EX_DEBUGGER = 256 + 0x04,
EX_BUS = 256 + 0x05
};
#define SIZE8 1
#define SIZE16 2
#define SIZE32 4
typedef struct {
uint8_t opcode;
uint8_t condition;
uint8_t offset;
uint8_t target;
uint8_t source;
uint8_t size;
} asm_instr_t;
static asm_instr_t asm_instr_from(uint16_t half) {
asm_instr_t instr = {
(half >> 8),
(half >> 4) & 7,
(half >> 7) & 1,
(half >> 2) & 3,
(half ) & 3,
(half >> 14)
};
return instr;
}
typedef fox32_vm_t vm_t;
static void vm_init(vm_t *vm) {
memset(vm, 0, sizeof(vm_t));
vm->pointer_instr = FOX32_POINTER_DEFAULT_INSTR;
vm->pointer_stack = FOX32_POINTER_DEFAULT_STACK;
vm->halted = true;
vm->soft_halted = false;
vm->mmu_enabled = false;
vm->is_consecutive_read = false;
vm->io_user = NULL;
vm->io_read = io_read_default;
vm->io_write = io_write_default;
}
static noreturn void vm_panic(vm_t *vm, err_t err) {
longjmp(vm->panic_jmp, (vm->panic_err = err, 1));
}
static noreturn void vm_unreachable(vm_t *vm) {
vm_panic(vm, FOX32_ERR_INTERNAL);
}
static uint32_t vm_io_read(vm_t *vm, uint32_t port) {
uint32_t value = 0;
int status = vm->io_read(vm->io_user, &value, port);
if (status != 0) {
vm_panic(vm, FOX32_ERR_IOREAD);
}
return value;
}
static void vm_io_write(vm_t *vm, uint32_t port, uint32_t value) {
int status = vm->io_write(vm->io_user, value, port);
if (status != 0) {
vm_panic(vm, FOX32_ERR_IOWRITE);
}
}
static uint8_t vm_flags_get(vm_t *vm) {
return (((uint8_t) vm->flag_swap_sp) << 3) |
(((uint8_t) vm->flag_interrupt) << 2) |
(((uint8_t) vm->flag_carry) << 1) |
((uint8_t) vm->flag_zero);
}
static void vm_flags_set(vm_t *vm, uint8_t flags) {
vm->flag_zero = (flags & 1) != 0;
vm->flag_carry = (flags & 2) != 0;
vm->flag_interrupt = (flags & 4) != 0;
vm->flag_swap_sp = (flags & 8) != 0;
}
static uint32_t *vm_findlocal(vm_t *vm, uint8_t local) {
if (local < FOX32_REGISTER_COUNT) {
return &vm->registers[local];
}
if (local == FOX32_REGISTER_COUNT) {
return &vm->pointer_stack;
}
if (local == FOX32_REGISTER_COUNT + 1) {
return &vm->pointer_exception_stack;
}
if (local == FOX32_REGISTER_COUNT + 2) {
return &vm->pointer_frame;
}
vm_panic(vm, FOX32_ERR_BADREGISTER);
}
static uint8_t spi_read8(vm_t *vm, uint32_t address) {
if ((!vm->is_consecutive_read) && (address == vm->previous_read_address + 1)) {
vm->is_consecutive_read = true;
vm->previous_read_address = address;
u8 bank = 0;
if (address > 0xFFFF) {
bank = 1;
address &= 0xFFFF;
}
SpiRamSeqReadStart(bank, (u16) address);
return SpiRamSeqReadU8();
}
if ((vm->is_consecutive_read) && (address == vm->previous_read_address + 1)) {
vm->previous_read_address = address;
return SpiRamSeqReadU8();
}
vm->previous_read_address = address;
if (vm->is_consecutive_read) {
vm->is_consecutive_read = false;
SpiRamSeqReadEnd();
u8 bank = 0;
if (address > 0xFFFF) {
bank = 1;
address &= 0xFFFF;
}
return SpiRamReadU8(bank, (u16) address);
} else {
u8 bank = 0;
if (address > 0xFFFF) {
bank = 1;
address &= 0xFFFF;
}
return SpiRamReadU8(bank, (u16) address);
}
}
static uint8_t vm_read8(vm_t *vm, uint32_t address) {
uint32_t address_end = address + 1;
if (address_end > address) {
if (address_end <= FOX32_MEMORY_RAM) {
// is this page in memory?
uint8_t page = address / 4096;
uint32_t offset = address % 4096;
if (vm->page_is_in_memory_bitmap[page / 8] & (1 << (page % 8))) {
// yes! find where it is
address = ((uint32_t) vm->page_on_disk_is_at[page] * (uint32_t) 4096) + offset;
} else {
// nope! load it into memory
load_page_in(vm, page);
address = ((uint32_t) vm->page_on_disk_is_at[page] * (uint32_t) 4096) + offset;
}
return spi_read8(vm, address);
}
// special case for the system jump table
if (
(address >= FOX32_MEMORY_ROM_START + 0x40000) &&
(address <= FOX32_MEMORY_ROM_START + 0x40FFF)
) {
address -= 0x40000 - 0x3000;
}
// special case for the disk jump table
else if (
(address >= FOX32_MEMORY_ROM_START + 0x45000) &&
(address <= FOX32_MEMORY_ROM_START + 0x45FFF)
) {
address -= 0x45000 - 0x3100;
}
// special case for the memory jump table
else if (
(address >= FOX32_MEMORY_ROM_START + 0x46000) &&
(address <= FOX32_MEMORY_ROM_START + 0x46FFF)
) {
address -= 0x46000 - 0x3200;
}
// special case for the integer jump table
else if (
(address >= FOX32_MEMORY_ROM_START + 0x47000) &&
(address <= FOX32_MEMORY_ROM_START + 0x47FFF)
) {
address -= 0x47000 - 0x3300;
}
if (
(address >= FOX32_MEMORY_ROM_START) &&
(address -= FOX32_MEMORY_ROM_START) + 1 <= FOX32_MEMORY_ROM
) {
return pgm_read_byte(&(fox32_rom[address]));
}
}
vm->exception_operand = address;
vm_panic(vm, FOX32_ERR_FAULT_RD);
}
static uint16_t vm_read16(vm_t *vm, uint32_t address) {
uint32_t address_end = address + 2;
if (address_end > address) {
uint16_t value = (uint32_t) vm_read8(vm, address) |
(uint32_t) vm_read8(vm, address + 1) << 8;
return value;
}
vm->exception_operand = address;
vm_panic(vm, FOX32_ERR_FAULT_RD);
}
static uint32_t vm_read32(vm_t *vm, uint32_t address) {
uint32_t address_end = address + 4;
if (address_end > address) {
uint32_t value = (uint32_t) vm_read8(vm, address) |
((uint32_t) vm_read8(vm, address + 1) << 8) |
((uint32_t) vm_read8(vm, address + 2) << 16) |
((uint32_t) vm_read8(vm, address + 3) << 24);
return value;
}
vm->exception_operand = address;
vm_panic(vm, FOX32_ERR_FAULT_RD);
}
static void vm_write8(vm_t *vm, uint32_t address, uint8_t value) {
if (vm->is_consecutive_read) {
vm->is_consecutive_read = false;
SpiRamSeqReadEnd();
}
// is this page in memory?
uint8_t page = address / 4096;
uint32_t offset = address % 4096;
if (vm->page_is_in_memory_bitmap[page / 8] & (1 << (page % 8))) {
// yes! find where it is
address = ((uint32_t) vm->page_on_disk_is_at[page] * (uint32_t) 4096) + offset;
} else {
// nope! load it into memory
load_page_in(vm, page);
address = ((uint32_t) vm->page_on_disk_is_at[page] * (uint32_t) 4096) + offset;
}
u8 bank = 0;
if (address > 0xFFFF) {
bank = 1;
address &= 0xFFFF;
}
SpiRamWriteU8(bank, (u16) address, value);
}
static void vm_write16(vm_t *vm, uint32_t address, uint16_t value) {
vm_write8(vm, address, value & 0xFF);
vm_write8(vm, address + 1, value >> 8);
}
static void vm_write32(vm_t *vm, uint32_t address, uint32_t value) {
vm_write8(vm, address, value & 0xFF);
vm_write8(vm, address + 1, (value >> 8) & 0xFF);
vm_write8(vm, address + 2, (value >> 16) & 0xFF);
vm_write8(vm, address + 3, (value >> 24) & 0xFF);
}
#define VM_PUSH_BODY(_vm_write, _size) \
_vm_write(vm, vm->pointer_stack - _size, value); \
vm->pointer_stack -= _size;
static void vm_push8(vm_t *vm, uint8_t value) {
VM_PUSH_BODY(vm_write8, SIZE8)
}
static void vm_push16(vm_t *vm, uint16_t value) {
VM_PUSH_BODY(vm_write16, SIZE16)
}
static void vm_push32(vm_t *vm, uint32_t value) {
VM_PUSH_BODY(vm_write32, SIZE32)
}
#define VM_POP_BODY(_vm_read, _size) \
uint32_t result = _vm_read(vm, vm->pointer_stack); \
vm->pointer_stack += _size; \
return result;
static uint8_t vm_pop8(vm_t *vm) {
VM_POP_BODY(vm_read8, SIZE8)
}
static uint16_t vm_pop16(vm_t *vm) {
VM_POP_BODY(vm_read16, SIZE16)
}
static uint32_t vm_pop32(vm_t *vm) {
VM_POP_BODY(vm_read32, SIZE32)
}
#define VM_SOURCE_BODY(_vm_read, _size, _type, _move, _offset) \
uint32_t pointer_base = vm->pointer_instr_mut; \
switch (prtype) { \
case TY_REG: { \
if (_move) vm->pointer_instr_mut += SIZE8; \
return (_type) *vm_findlocal(vm, vm_read8(vm, pointer_base)); \
}; \
case TY_REGPTR: { \
if (_move) vm->pointer_instr_mut += SIZE8+_offset; \
return _vm_read(vm, *vm_findlocal(vm, vm_read8(vm, pointer_base)) \
+(_offset ? vm_read8(vm, pointer_base + 1) : 0)); \
}; \
case TY_IMM: { \
if (_move) vm->pointer_instr_mut += _size; \
return _vm_read(vm, pointer_base); \
}; \
case TY_IMMPTR: { \
if (_move) vm->pointer_instr_mut += SIZE32; \
return _vm_read(vm, vm_read32(vm, pointer_base)); \
}; \
} \
vm_unreachable(vm);
static uint8_t vm_source8(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read8, SIZE8, uint8_t, true, offset)
}
static uint8_t vm_source8_stay(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read8, SIZE8, uint8_t, false, offset)
}
static uint16_t vm_source16(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read16, SIZE16, uint16_t, true, offset)
}
static uint16_t vm_source16_stay(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read16, SIZE16, uint16_t, false, offset)
}
static uint32_t vm_source32(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read32, SIZE32, uint32_t, true, offset)
}
static uint32_t vm_source32_stay(vm_t *vm, uint8_t prtype, uint8_t offset) {
VM_SOURCE_BODY(vm_read32, SIZE32, uint32_t, false, offset)
}
#define VM_TARGET_BODY(_vm_write, _localvalue, _offset) \
uint32_t pointer_base = vm->pointer_instr_mut; \
switch (prtype) { \
case TY_REG: { \
vm->pointer_instr_mut += SIZE8; \
uint8_t local = vm_read8(vm, pointer_base); \
*vm_findlocal(vm, local) = _localvalue; \
return; \
}; \
case TY_REGPTR: { \
vm->pointer_instr_mut += SIZE8+_offset; \
_vm_write(vm, ( _offset ? vm_read8(vm, pointer_base + 1) : 0) + \
*vm_findlocal(vm, vm_read8(vm, pointer_base)), value); \
return; \
}; \
case TY_IMM: { \
vm_panic(vm, FOX32_ERR_BADIMMEDIATE); \
return; \
}; \
case TY_IMMPTR: { \
vm->pointer_instr_mut += SIZE32; \
_vm_write(vm, vm_read32(vm, pointer_base), value); \
return; \
}; \
}; \
vm_unreachable(vm);
static void vm_target8(vm_t *vm, uint8_t prtype, uint8_t value, uint8_t offset) {
VM_TARGET_BODY(vm_write8, (*vm_findlocal(vm, local) & 0xFFFFFF00) | (uint32_t) value, offset)
}
static void vm_target8_zero(vm_t *vm, uint8_t prtype, uint8_t value, uint8_t offset) {
VM_TARGET_BODY(vm_write32, (uint32_t) value, offset)
}
static void vm_target16(vm_t *vm, uint8_t prtype, uint16_t value, uint8_t offset) {
VM_TARGET_BODY(vm_write16, (*vm_findlocal(vm, local) & 0xFFFF0000) | (uint32_t) value, offset)
}
static void vm_target16_zero(vm_t *vm, uint8_t prtype, uint16_t value, uint8_t offset) {
VM_TARGET_BODY(vm_write32, (uint32_t) value, offset)
}
static void vm_target32(vm_t *vm, uint8_t prtype, uint32_t value, uint8_t offset) {
VM_TARGET_BODY(vm_write32, value, offset)
}
static bool vm_shouldskip(vm_t *vm, uint8_t condition) {
switch (condition) {
case CD_ALWAYS: {
return false;
};
case CD_IFZ: {
return vm->flag_zero == false;
};
case CD_IFNZ: {
return vm->flag_zero == true;
};
case CD_IFC: {
return vm->flag_carry == false;
};
case CD_IFNC: {
return vm->flag_carry == true;
};
case CD_IFGT: {
return (vm->flag_zero == true) || (vm->flag_carry == true);
};
case CD_IFLTEQ: {
return (vm->flag_zero == false) && (vm->flag_carry == false);
};
}
vm_panic(vm, FOX32_ERR_BADCONDITION);
}
static void vm_skipparam(vm_t *vm, uint32_t size, uint8_t prtype, uint8_t offset) {
if (prtype < TY_IMM) {
vm->pointer_instr_mut += SIZE8;
if (offset && prtype==TY_REGPTR)
vm->pointer_instr_mut += SIZE8;
} else if (prtype == TY_IMMPTR) {
vm->pointer_instr_mut += SIZE32;
} else {
vm->pointer_instr_mut += size;
}
}
#define CHECKED_ADD(_a, _b, _out) __builtin_add_overflow(_a, _b, _out)
#define CHECKED_SUB(_a, _b, _out) __builtin_sub_overflow(_a, _b, _out)
#define CHECKED_MUL(_a, _b, _out) __builtin_mul_overflow(_a, _b, _out)
#define OPER_DIV(_a, _b) ((_a) / (_b))
#define OPER_REM(_a, _b) ((_a) % (_b))
#define OPER_AND(_a, _b) ((_a) & (_b))
#define OPER_XOR(_a, _b) ((_a) ^ (_b))
#define OPER_OR(_a, _b) ((_a) | (_b))
#define OPER_SHIFT_LEFT(_a, _b) ((_a) << (_b))
#define OPER_SHIFT_RIGHT(_a, _b) ((_a) >> (_b))
#define OPER_BIT_SET(_a, _b) ((_a) | (1 << (_b)))
#define OPER_BIT_CLEAR(_a, _b) ((_a) & ~(1 << (_b)))
#define ROTATE_LEFT(_size, _a, _b) (((_a) << (_b)) | ((_a) >> (((_size) * 8) - (_b))))
#define ROTATE_LEFT8(_a, _b) ROTATE_LEFT(SIZE8, _a, _b)
#define ROTATE_LEFT16(_a, _b) ROTATE_LEFT(SIZE16, _a, _b)
#define ROTATE_LEFT32(_a, _b) ROTATE_LEFT(SIZE32, _a, _b)
#define ROTATE_RIGHT(_size, _a, _b) (((_a) >> (_b)) | ((_a) << (((_size) * 8) - (_b))))
#define ROTATE_RIGHT8(_a, _b) ROTATE_RIGHT(SIZE8, _a, _b)
#define ROTATE_RIGHT16(_a, _b) ROTATE_RIGHT(SIZE16, _a, _b)
#define ROTATE_RIGHT32(_a, _b) ROTATE_RIGHT(SIZE32, _a, _b)
#define SOURCEMAP_IDENTITY(x) (x)
#define SOURCEMAP_RELATIVE(x) (instr_base + (x))
#define VM_PRELUDE_0() { \
if (vm_shouldskip(vm, instr.condition)) { \
break; \
} \
}
#define VM_PRELUDE_1(_size) { \
if (vm_shouldskip(vm, instr.condition)) { \
vm_skipparam(vm, _size, instr.source, instr.offset); \
break; \
} \
}
#define VM_PRELUDE_2(_size) { \
if (vm_shouldskip(vm, instr.condition)) { \
vm_skipparam(vm, _size, instr.target, instr.offset); \
vm_skipparam(vm, _size, instr.source, instr.offset); \
break; \
} \
}
#define VM_PRELUDE_BIT(_size) { \
if (vm_shouldskip(vm, instr.condition)) { \
vm_skipparam(vm, _size, instr.target, instr.offset); \
vm_skipparam(vm, SIZE8, instr.source, instr.offset); \
break; \
} \
}
#define VM_IMPL_JMP(_size, _sourcemap) { \
VM_PRELUDE_1(_size); \
switch (_size) { \
case SIZE8: vm->pointer_instr_mut = _sourcemap((int8_t)vm_source8(vm, instr.source, instr.offset)); break; \
case SIZE16: vm->pointer_instr_mut = _sourcemap((int16_t)vm_source16(vm, instr.source, instr.offset)); break; \
default: vm->pointer_instr_mut = _sourcemap(vm_source32(vm, instr.source, instr.offset)); break; \
} \
break; \
}
#define VM_IMPL_LOOP(_size, _sourcemap) { \
if ( \
!vm_shouldskip(vm, instr.condition) && \
(vm->registers[FOX32_REGISTER_LOOP] -= 1) != 0 \
) { \
switch (_size) { \
case SIZE8: vm->pointer_instr_mut = _sourcemap((int8_t)vm_source8(vm, instr.source, instr.offset)); break; \
case SIZE16: vm->pointer_instr_mut = _sourcemap((int16_t)vm_source16(vm, instr.source, instr.offset)); break; \
default: vm->pointer_instr_mut = _sourcemap(vm_source32(vm, instr.source, instr.offset)); break; \
} \
} else { \
vm_skipparam(vm, _size, instr.source, instr.offset); \
} \
break; \
}
#define VM_IMPL_CALL(_size, _sourcemap) { \
VM_PRELUDE_1(_size); \
uint32_t pointer_call; \
switch (_size) { \
case SIZE8: pointer_call = (int8_t)vm_source8(vm, instr.source, instr.offset); break; \
case SIZE16: pointer_call = (int16_t)vm_source16(vm, instr.source, instr.offset); break; \
default: pointer_call = vm_source32(vm, instr.source, instr.offset); break; \
} \
vm_push32(vm, vm->pointer_instr_mut); \
switch (_size) { \
case SIZE8: vm->pointer_instr_mut = _sourcemap((int8_t)pointer_call); break; \
case SIZE16: vm->pointer_instr_mut = _sourcemap((int16_t)pointer_call); break; \
default: vm->pointer_instr_mut = _sourcemap(pointer_call); break; \
} \
break; \
}
// make sure NOT to update the stack pointer until the full instruction has
// been read, and the target has been written. otherwise a pagefault halfway
// through could wreak havoc.
#define VM_IMPL_POP(_size, _vm_target, _vm_pop) { \
VM_PRELUDE_1(_size); \
uint32_t oldsp = vm->pointer_stack; \
uint32_t val = _vm_pop(vm); \
uint32_t newsp = vm->pointer_stack; \
vm->pointer_stack = oldsp; \
_vm_target(vm, instr.source, val, instr.offset); \
vm->pointer_stack = newsp; \
break; \
}
#define VM_IMPL_PUSH(_size, _vm_source, _vm_push) { \
VM_PRELUDE_1(_size); \
_vm_push(vm, _vm_source(vm, instr.source, instr.offset)); \
break; \
}
#define VM_IMPL_MOV(_size, _vm_source, _vm_target) { \
VM_PRELUDE_2(_size); \
_vm_target(vm, instr.target, _vm_source(vm, instr.source, instr.offset), instr.offset); \
break; \
}
#define VM_IMPL_NOT(_size, _type, _vm_source_stay, _vm_target) { \
VM_PRELUDE_1(_size); \
_type v = _vm_source_stay(vm, instr.source, instr.offset); \
_type x = ~v; \
_vm_target(vm, instr.source, x, instr.offset); \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_INC(_size, _type, _vm_source_stay, _vm_target, _oper) { \
VM_PRELUDE_1(_size); \
_type v = _vm_source_stay(vm, instr.source, instr.offset); \
_type x; \
bool carry = _oper(v, 1 << instr.target, &x); \
_vm_target(vm, instr.source, x, instr.offset); \
vm->flag_carry = carry; \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_ADD(_size, _type, _type_target, _vm_source, _vm_source_stay, _vm_target, _oper) { \
VM_PRELUDE_2(_size); \
_type a = (_type) _vm_source(vm, instr.source, instr.offset); \
_type b = (_type) _vm_source_stay(vm, instr.target, instr.offset); \
_type x; \
bool carry = _oper(b, a, &x); \
_vm_target(vm, instr.target, (_type_target) x, instr.offset); \
vm->flag_carry = carry; \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_AND(_size, _type, _type_target, _vm_source, _vm_source_stay, _vm_target, _oper) { \
VM_PRELUDE_2(_size); \
_type a = (_type) _vm_source(vm, instr.source, instr.offset); \
_type b = (_type) _vm_source_stay(vm, instr.target, instr.offset); \
_type x = _oper(b, a); \
_vm_target(vm, instr.target, (_type_target) x, instr.offset); \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_SHIFT(_size, _type, _type_target, _vm_source, _vm_source_stay, _vm_target, _oper){\
VM_PRELUDE_BIT(_size); \
_type a = (_type) vm_source8(vm, instr.source, instr.offset); \
_type b = (_type) _vm_source_stay(vm, instr.target, instr.offset); \
_type x = _oper(b, a); \
_vm_target(vm, instr.target, (_type_target) x, instr.offset); \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_DIV(_size, _type, _type_target, _vm_source, _vm_source_stay, _vm_target, _oper) { \
VM_PRELUDE_2(_size); \
_type a = (_type) _vm_source(vm, instr.source, instr.offset); \
_type b = (_type) _vm_source_stay(vm, instr.target, instr.offset); \
if (a == 0) { \
vm_panic(vm, FOX32_ERR_DIVZERO); \
break; \
} \
_type x = _oper(b, a); \
_vm_target(vm, instr.target, (_type_target) x, instr.offset); \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_CMP(_size, _type, _vm_source) { \
VM_PRELUDE_2(_size); \
_type a = _vm_source(vm, instr.source, instr.offset); \
_type b = _vm_source(vm, instr.target, instr.offset); \
_type x; \
vm->flag_carry = CHECKED_SUB(b, a, &x); \
vm->flag_zero = x == 0; \
break; \
}
#define VM_IMPL_BTS(_size, _type, _vm_source) { \
VM_PRELUDE_BIT(_size); \
_type a = vm_source8(vm, instr.source, instr.offset); \
_type b = _vm_source(vm, instr.target, instr.offset); \
_type x = b & (1 << a); \
vm->flag_zero = x == 0; \
break; \
}
static void vm_execute(vm_t *vm) {
uint32_t instr_base = vm->pointer_instr;
uint16_t instr_raw = vm_read16(vm, instr_base);
asm_instr_t instr = asm_instr_from(instr_raw);
vm->pointer_instr_mut = instr_base + SIZE16;
switch (instr.opcode) {
case OP(SZ_BYTE, OP_NOP):
case OP(SZ_HALF, OP_NOP):
case OP(SZ_WORD, OP_NOP): {
break;
};
case OP(SZ_BYTE, OP_HALT):
case OP(SZ_HALF, OP_HALT):
case OP(SZ_WORD, OP_HALT): {
VM_PRELUDE_0();
vm->soft_halted = true;
break;
};
case OP(SZ_BYTE, OP_BRK):
case OP(SZ_HALF, OP_BRK):
case OP(SZ_WORD, OP_BRK): {
VM_PRELUDE_0();
vm->pointer_instr = vm->pointer_instr_mut;
vm_panic(vm, FOX32_ERR_DEBUGGER);
break;
};
case OP(SZ_WORD, OP_IN): {
VM_PRELUDE_2(SIZE32);
vm_target32(vm, instr.target, vm_io_read(vm, vm_source32(vm, instr.source, 0)), instr.offset);
break;
};
case OP(SZ_WORD, OP_OUT): {
VM_PRELUDE_2(SIZE32);
uint32_t value = vm_source32(vm, instr.source, instr.offset);
uint32_t port = vm_source32(vm, instr.target, instr.offset);
vm_io_write(vm, port, value);
break;
};
case OP(SZ_BYTE, OP_RTA): {
VM_PRELUDE_2(SIZE8);
vm_target32(vm, instr.target, instr_base + (int8_t)vm_source8(vm, instr.source, instr.offset), instr.offset);
break;
};
case OP(SZ_HALF, OP_RTA): {
VM_PRELUDE_2(SIZE16);
vm_target32(vm, instr.target, instr_base + (int16_t)vm_source16(vm, instr.source, instr.offset), instr.offset);
break;
};
case OP(SZ_WORD, OP_RTA): {
VM_PRELUDE_2(SIZE32);
vm_target32(vm, instr.target, instr_base + vm_source32(vm, instr.source, instr.offset), instr.offset);
break;
};
case OP(SZ_WORD, OP_RET): {
VM_PRELUDE_0();
vm->pointer_instr_mut = vm_pop32(vm);
break;
};
case OP(SZ_WORD, OP_RETI): {
VM_PRELUDE_0();
vm_flags_set(vm, vm_pop8(vm));
vm->pointer_instr_mut = vm_pop32(vm);
if (vm->flag_swap_sp) {
vm->pointer_stack = vm_pop32(vm);
}
break;
};
case OP(SZ_WORD, OP_ISE): {
VM_PRELUDE_0();
vm->flag_interrupt = true;
break;
};
case OP(SZ_WORD, OP_ICL): {
VM_PRELUDE_0();
vm->flag_interrupt = false;
break;
};
case OP(SZ_WORD, OP_JMP): VM_IMPL_JMP(SIZE32, SOURCEMAP_IDENTITY);
case OP(SZ_WORD, OP_CALL): VM_IMPL_CALL(SIZE32, SOURCEMAP_IDENTITY);
case OP(SZ_WORD, OP_LOOP): VM_IMPL_LOOP(SIZE32, SOURCEMAP_IDENTITY);
case OP(SZ_BYTE, OP_RJMP): VM_IMPL_JMP(SIZE8, SOURCEMAP_RELATIVE);
case OP(SZ_BYTE, OP_RCALL): VM_IMPL_CALL(SIZE8, SOURCEMAP_RELATIVE);
case OP(SZ_BYTE, OP_RLOOP): VM_IMPL_LOOP(SIZE8, SOURCEMAP_RELATIVE);
case OP(SZ_HALF, OP_RJMP): VM_IMPL_JMP(SIZE16, SOURCEMAP_RELATIVE);
case OP(SZ_HALF, OP_RCALL): VM_IMPL_CALL(SIZE16, SOURCEMAP_RELATIVE);
case OP(SZ_HALF, OP_RLOOP): VM_IMPL_LOOP(SIZE16, SOURCEMAP_RELATIVE);
case OP(SZ_WORD, OP_RJMP): VM_IMPL_JMP(SIZE32, SOURCEMAP_RELATIVE);
case OP(SZ_WORD, OP_RCALL): VM_IMPL_CALL(SIZE32, SOURCEMAP_RELATIVE);
case OP(SZ_WORD, OP_RLOOP): VM_IMPL_LOOP(SIZE32, SOURCEMAP_RELATIVE);
case OP(SZ_BYTE, OP_POP): VM_IMPL_POP(SIZE8, vm_target8, vm_pop8);
case OP(SZ_HALF, OP_POP): VM_IMPL_POP(SIZE16, vm_target16, vm_pop16);
case OP(SZ_WORD, OP_POP): VM_IMPL_POP(SIZE32, vm_target32, vm_pop32);
case OP(SZ_BYTE, OP_PUSH): VM_IMPL_PUSH(SIZE8, vm_source8, vm_push8);
case OP(SZ_HALF, OP_PUSH): VM_IMPL_PUSH(SIZE16, vm_source16, vm_push16);
case OP(SZ_WORD, OP_PUSH): VM_IMPL_PUSH(SIZE32, vm_source32, vm_push32);
case OP(SZ_BYTE, OP_MOV): VM_IMPL_MOV(SIZE8, vm_source8, vm_target8);
case OP(SZ_BYTE, OP_MOVZ): VM_IMPL_MOV(SIZE8, vm_source8, vm_target8_zero);
case OP(SZ_HALF, OP_MOV): VM_IMPL_MOV(SIZE16, vm_source16, vm_target16);
case OP(SZ_HALF, OP_MOVZ): VM_IMPL_MOV(SIZE16, vm_source16, vm_target16_zero);
case OP(SZ_WORD, OP_MOV):
case OP(SZ_WORD, OP_MOVZ): VM_IMPL_MOV(SIZE32, vm_source32, vm_target32);
case OP(SZ_BYTE, OP_NOT): VM_IMPL_NOT(SIZE8, uint8_t, vm_source8_stay, vm_target8);
case OP(SZ_HALF, OP_NOT): VM_IMPL_NOT(SIZE16, uint16_t, vm_source16_stay, vm_target16);
case OP(SZ_WORD, OP_NOT): VM_IMPL_NOT(SIZE32, uint32_t, vm_source32_stay, vm_target32);
case OP(SZ_BYTE, OP_INC): VM_IMPL_INC(SIZE8, uint8_t, vm_source8_stay, vm_target8, CHECKED_ADD);
case OP(SZ_HALF, OP_INC): VM_IMPL_INC(SIZE16, uint16_t, vm_source16_stay, vm_target16, CHECKED_ADD);
case OP(SZ_WORD, OP_INC): VM_IMPL_INC(SIZE32, uint32_t, vm_source32_stay, vm_target32, CHECKED_ADD);
case OP(SZ_BYTE, OP_DEC): VM_IMPL_INC(SIZE8, uint8_t, vm_source8_stay, vm_target8, CHECKED_SUB);
case OP(SZ_HALF, OP_DEC): VM_IMPL_INC(SIZE16, uint16_t, vm_source16_stay, vm_target16, CHECKED_SUB);
case OP(SZ_WORD, OP_DEC): VM_IMPL_INC(SIZE32, uint32_t, vm_source32_stay, vm_target32, CHECKED_SUB);
case OP(SZ_BYTE, OP_ADD): VM_IMPL_ADD(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, CHECKED_ADD);
case OP(SZ_HALF, OP_ADD): VM_IMPL_ADD(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, CHECKED_ADD);
case OP(SZ_WORD, OP_ADD): VM_IMPL_ADD(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, CHECKED_ADD);
case OP(SZ_BYTE, OP_SUB): VM_IMPL_ADD(SIZE8, uint8_t, uint8_t ,vm_source8, vm_source8_stay, vm_target8, CHECKED_SUB);
case OP(SZ_HALF, OP_SUB): VM_IMPL_ADD(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, CHECKED_SUB);
case OP(SZ_WORD, OP_SUB): VM_IMPL_ADD(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, CHECKED_SUB);
case OP(SZ_BYTE, OP_MUL): VM_IMPL_ADD(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, CHECKED_MUL);
case OP(SZ_HALF, OP_MUL): VM_IMPL_ADD(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, CHECKED_MUL);
case OP(SZ_WORD, OP_MUL): VM_IMPL_ADD(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, CHECKED_MUL);
case OP(SZ_BYTE, OP_IMUL): VM_IMPL_ADD(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, CHECKED_MUL);
case OP(SZ_HALF, OP_IMUL): VM_IMPL_ADD(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, CHECKED_MUL);
case OP(SZ_WORD, OP_IMUL): VM_IMPL_ADD(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, CHECKED_MUL);
case OP(SZ_BYTE, OP_DIV): VM_IMPL_DIV(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_DIV): VM_IMPL_DIV(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_DIV): VM_IMPL_DIV(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_REM): VM_IMPL_DIV(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_REM): VM_IMPL_DIV(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_REM): VM_IMPL_DIV(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_IDIV): VM_IMPL_DIV(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_DIV);
case OP(SZ_HALF, OP_IDIV): VM_IMPL_DIV(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_DIV);
case OP(SZ_WORD, OP_IDIV): VM_IMPL_DIV(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_DIV);
case OP(SZ_BYTE, OP_IREM): VM_IMPL_DIV(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_REM);
case OP(SZ_HALF, OP_IREM): VM_IMPL_DIV(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_REM);
case OP(SZ_WORD, OP_IREM): VM_IMPL_DIV(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_REM);
case OP(SZ_BYTE, OP_AND): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_AND);
case OP(SZ_HALF, OP_AND): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_AND);
case OP(SZ_WORD, OP_AND): VM_IMPL_AND(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_AND);
case OP(SZ_BYTE, OP_XOR): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_XOR);
case OP(SZ_HALF, OP_XOR): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_XOR);
case OP(SZ_WORD, OP_XOR): VM_IMPL_AND(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_XOR);
case OP(SZ_BYTE, OP_OR): VM_IMPL_AND(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_OR);
case OP(SZ_HALF, OP_OR): VM_IMPL_AND(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_OR);
case OP(SZ_WORD, OP_OR): VM_IMPL_AND(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_OR);
case OP(SZ_BYTE, OP_SLA): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_SHIFT_LEFT);
case OP(SZ_HALF, OP_SLA): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_SHIFT_LEFT);
case OP(SZ_WORD, OP_SLA): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_SHIFT_LEFT);
case OP(SZ_BYTE, OP_SRL): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_SHIFT_RIGHT);
case OP(SZ_HALF, OP_SRL): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_SHIFT_RIGHT);
case OP(SZ_WORD, OP_SRL): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_SHIFT_RIGHT);
case OP(SZ_BYTE, OP_SRA): VM_IMPL_SHIFT(SIZE8, int8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_SHIFT_RIGHT);
case OP(SZ_HALF, OP_SRA): VM_IMPL_SHIFT(SIZE16, int16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_SHIFT_RIGHT);
case OP(SZ_WORD, OP_SRA): VM_IMPL_SHIFT(SIZE32, int32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_SHIFT_RIGHT);
case OP(SZ_BYTE, OP_ROL): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, ROTATE_LEFT8);
case OP(SZ_HALF, OP_ROL): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, ROTATE_LEFT16);
case OP(SZ_WORD, OP_ROL): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, ROTATE_LEFT32);
case OP(SZ_BYTE, OP_ROR): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, ROTATE_RIGHT8);
case OP(SZ_HALF, OP_ROR): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, ROTATE_RIGHT16);
case OP(SZ_WORD, OP_ROR): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, ROTATE_RIGHT32);
case OP(SZ_BYTE, OP_BSE): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_BIT_SET);
case OP(SZ_HALF, OP_BSE): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_BIT_SET);
case OP(SZ_WORD, OP_BSE): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_BIT_SET);
case OP(SZ_BYTE, OP_BCL): VM_IMPL_SHIFT(SIZE8, uint8_t, uint8_t, vm_source8, vm_source8_stay, vm_target8, OPER_BIT_CLEAR);
case OP(SZ_HALF, OP_BCL): VM_IMPL_SHIFT(SIZE16, uint16_t, uint16_t, vm_source16, vm_source16_stay, vm_target16, OPER_BIT_CLEAR);
case OP(SZ_WORD, OP_BCL): VM_IMPL_SHIFT(SIZE32, uint32_t, uint32_t, vm_source32, vm_source32_stay, vm_target32, OPER_BIT_CLEAR);
case OP(SZ_BYTE, OP_CMP): VM_IMPL_CMP(SIZE8, uint8_t, vm_source8);
case OP(SZ_HALF, OP_CMP): VM_IMPL_CMP(SIZE16, uint16_t, vm_source16);
case OP(SZ_WORD, OP_CMP): VM_IMPL_CMP(SIZE32, uint32_t, vm_source32);
case OP(SZ_BYTE, OP_ICMP): VM_IMPL_CMP(SIZE8, int8_t, vm_source8);
case OP(SZ_HALF, OP_ICMP): VM_IMPL_CMP(SIZE16, int16_t, vm_source16);
case OP(SZ_WORD, OP_ICMP): VM_IMPL_CMP(SIZE32, int32_t, vm_source32);
case OP(SZ_BYTE, OP_BTS): VM_IMPL_BTS(SIZE8, uint8_t, vm_source8);
case OP(SZ_HALF, OP_BTS): VM_IMPL_BTS(SIZE16, uint16_t, vm_source16);
case OP(SZ_WORD, OP_BTS): VM_IMPL_BTS(SIZE32, uint32_t, vm_source32);
case OP(SZ_WORD, OP_MSE): {
VM_PRELUDE_0();
vm->mmu_enabled = true;
break;
};
case OP(SZ_WORD, OP_MCL): {
VM_PRELUDE_0();
vm->mmu_enabled = false;
break;
};
case OP(SZ_WORD, OP_INT): {
VM_PRELUDE_1(SIZE32);
uint32_t intr = vm_source32(vm, instr.source, instr.offset);
vm->pointer_instr = vm->pointer_instr_mut;
fox32_raise(vm, intr);
vm->pointer_instr_mut = vm->pointer_instr;
break;
};
default:
vm->exception_operand = instr_raw;
vm_panic(vm, FOX32_ERR_BADOPCODE);
}
vm->pointer_instr = vm->pointer_instr_mut;
}
static err_t vm_step(vm_t *vm) {
if (setjmp(vm->panic_jmp) != 0) {
return vm->halted = true, vm->panic_err;
}
vm_execute(vm);
return FOX32_ERR_OK;
}
static err_t vm_resume(vm_t *vm, uint32_t count, uint32_t *executed) {
if (setjmp(vm->panic_jmp) != 0) {
return vm->halted = true, vm->panic_err;
}
vm->halted = false;
uint32_t remaining = count;
while (!vm->halted && !vm->soft_halted && remaining > 0) {
vm_execute(vm);
remaining -= 1;
*executed += 1;
}
if (vm->soft_halted) {
*executed = count;
}
return FOX32_ERR_OK;
}
static fox32_err_t vm_raise(vm_t *vm, uint16_t vector) {
if (!vm->flag_interrupt && vector < 256) {
return FOX32_ERR_NOINTERRUPTS;
}
if (setjmp(vm->panic_jmp) != 0) {
return vm->panic_err;
}
uint32_t pointer_handler = vm_read32(vm, SIZE32 * (uint32_t) vector);
if (vm->flag_swap_sp) {
uint32_t old_stack_pointer = vm->pointer_stack;
vm->pointer_stack = vm->pointer_exception_stack;
vm_push32(vm, old_stack_pointer);
vm_push32(vm, vm->pointer_instr);
vm_push8(vm, vm_flags_get(vm));
vm->flag_swap_sp = false;
} else {
vm_push32(vm, vm->pointer_instr);
vm_push8(vm, vm_flags_get(vm));
}