CAR/load_store.c

/*
 * Source file for load/store operations.
 * 
 * CAR (Cool ARM Ripoff) copyright (c) 2026 David J Goeke. All rights reserved.
 * Unauthorized (re)distribution is prohibited.
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "include/defs.h"


DEFINE_OP(ldr)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint8_t reg = i.reg;
	
	uint32_t dest;
	uint32_t addr = state->pc + i.imm;
	
	//assert(addr < state->memory_size);
	if (addr >= state->memory_size)
	{
		printf("addr >= state->memory_size!\n");
		//OP_RETURN_EXITING_ERROR
	}
	
	printf("loading register %i with value from address 0x%04x, imm: 0x%04x\n", reg, addr, i.imm); 

	memcpy(&dest, state->memory + addr, sizeof(dest));
	
	state->gprs[reg] = dest;
	
	OP_RETURN_NORMAL
}

DEFINE_OP(lds)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint8_t reg = i.reg;
	
	uint32_t dest;
	uint32_t addr = state->sp + i.imm;

	memcpy(&dest, state->memory + addr, sizeof(dest));
	
	state->gprs[reg] = dest;
	
	OP_RETURN_NORMAL
}

DEFINE_OP(ldb)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint8_t reg = i.reg;
	
	uint32_t dest;
	uint32_t base_value = state->gprs[get_reg_from_imm(i.imm)];
	uint32_t addr = base_value + (uint32_t) get_imm_from_imm(i.imm);

	memcpy(&dest, state->memory + addr, sizeof(dest));
	
	state->gprs[reg] = dest;
	
	OP_RETURN_NORMAL
}

DEFINE_OP(ldi)
{	
	ls_instruction_t i = convert_raw2ls(ri);

	uint8_t reg = i.reg;
	
	//uint32_t value = (i.imm) & 0b111111111111111111111; // should convert this to hex
	uint32_t value = i.imm;
	
#ifdef _DEBUG
	printf("In ldi, reg: 0b%05b, imm: 0x%x\n", reg, value);
#endif	

	state->gprs[reg] |= value;
	
	OP_RETURN_NORMAL
}

DEFINE_OP(str)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint32_t value = state->gprs[i.reg];
	uint32_t addr = state->pc + i.imm;

	memcpy(state->memory + addr, &value, sizeof(value));
	
	OP_RETURN_NORMAL
}

DEFINE_OP(sts)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint32_t value = state->gprs[i.reg];
	uint32_t addr = state->sp + i.imm;

	memcpy(state->memory + addr, &value, sizeof(value));
	
	OP_RETURN_NORMAL
}

DEFINE_OP(stb)
{
	ls_instruction_t i = convert_raw2ls(ri);
	
	uint32_t value = state->gprs[i.reg];
	uint32_t base_value = state->gprs[get_reg_from_imm(i.imm)];
	uint32_t addr = base_value + (uint32_t) get_imm_from_imm(i.imm);

	memcpy(state->memory + addr, &value, sizeof(value));
	
	OP_RETURN_NORMAL
}

DEFINE_OP(ldh)
{
	ls_instruction_t i = convert_raw2ls(ri);

	uint8_t reg = i.reg;
	
	uint32_t value = (i.imm) & 0b11111111111; // should convert this to hex
	
	state->gprs[reg] = (state->gprs[reg] & 0x001FFFFF) | ((value & 0x7FF) << 21);
	
	OP_RETURN_NORMAL
}

DEFINE_OP(sti)
{
	ls_instruction_t i = convert_raw2ls(ri);

	uint32_t addr = state->pc + state->gprs[i.reg];
	uint32_t value = i.imm;

	memcpy(state->memory + addr, &value, sizeof(value));
	
	OP_RETURN_NORMAL
}

DEFINE_OP(stj)
{
	ls_instruction_t i = convert_raw2ls(ri);

	uint32_t addr = state->sp + state->gprs[i.reg];
	uint32_t value = i.imm;

	memcpy(state->memory + addr, &value, sizeof(value));
	
	OP_RETURN_NORMAL
}