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#include "registers.h"
#include "qtmipsexception.h"
#include "utils.h"
// TODO should this be configurable?
//////////////////////////////////////////////////////////////////////////////
/// Program counter initial value
#define PC_INIT 0x80020000
//////////////////////////////////////////////////////////////////////////////
Registers::Registers() {
this->pc = PC_INIT; // Initialize to beginning program section
for (int i = 0; i < 31; i++)
this->gp[i] = 0;
this->hi = this->lo = 0;
}
std::uint32_t Registers::read_pc() {
return this->pc;
}
std::uint32_t Registers::pc_inc() {
this->pc += 4;
return this->pc;
}
std::uint32_t Registers::pc_jmp(std::int32_t offset) {
if (offset % 4)
throw QTMIPS_EXCEPTION(UnalignedJump, "Trying to jump by unaligned offset", to_string_hex(offset));
this->pc += offset;
return this->pc;
}
void Registers::pc_abs_jmp(std::uint32_t address) {
if (address % 4)
throw QTMIPS_EXCEPTION(UnalignedJump, "Trying to jump to unaligned address", to_string_hex(address));
this->pc = address;
}
std::uint32_t Registers::read_gp(std::uint8_t i) {
SANITY_ASSERT(i < 32, std::string("Trying to read from register ") + std::to_string(i));
if (!i) // $0 always reads as 0
return 0;
return this->gp[i - 1];
}
void Registers::write_gp(std::uint8_t i, std::uint32_t value) {
SANITY_ASSERT(i < 32, std::string("Trying to write to register ") + std::to_string(i));
if (i == 0) // Skip write to $0
return;
this->gp[i - 1] = value;
}
std::uint32_t Registers::read_hi_lo(bool hi) {
if (hi)
return this->hi;
else
return this->lo;
}
void Registers::write_hi_lo(bool hi, std::uint32_t value) {
if (hi)
this->hi = value;
else
this->lo = value;
}
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