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[UNTESTED] complete initial disassembler structure for ARM

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Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
This commit is contained in:
Amneesh Singh
2023-09-15 05:23:07 +05:30
parent 169723275e
commit 7fc6876264
9 changed files with 701 additions and 149 deletions
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25
include/cpu/cpu.hh
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@@ -14,14 +14,14 @@ class Cpu {
void step();
private:
static constexpr size_t GPR_COUNT = 16;
static constexpr uint8_t GPR_COUNT = 16;
static constexpr size_t GPR_FIQ_FIRST = 8;
static constexpr size_t GPR_SVC_FIRST = 13;
static constexpr size_t GPR_ABT_FIRST = 13;
static constexpr size_t GPR_IRQ_FIRST = 13;
static constexpr size_t GPR_UND_FIRST = 13;
static constexpr size_t GPR_SYS_USR_FIRST = 8;
static constexpr uint8_t GPR_FIQ_FIRST = 8;
static constexpr uint8_t GPR_SVC_FIRST = 13;
static constexpr uint8_t GPR_ABT_FIRST = 13;
static constexpr uint8_t GPR_IRQ_FIRST = 13;
static constexpr uint8_t GPR_UND_FIRST = 13;
static constexpr uint8_t GPR_SYS_USR_FIRST = 8;
std::shared_ptr<Bus> bus;
std::array<uint32_t, GPR_COUNT> gpr; // general purpose registers
@@ -29,7 +29,13 @@ class Cpu {
Psr cpsr; // current program status register
Psr spsr; // status program status register
uint32_t& pc = gpr[15];
static constexpr uint8_t PC_INDEX = 15;
uint32_t& pc = gpr[PC_INDEX];
bool is_flushed;
void chg_mode(const Mode to);
void exec_arm(const ArmInstruction instruction);
struct {
std::array<uint32_t, GPR_COUNT - GPR_FIQ_FIRST - 1> fiq;
@@ -49,7 +55,4 @@ class Cpu {
Psr irq;
Psr und;
} spsr_banked; // banked saved program status registers
void chg_mode(const Mode to);
void exec_arm(const ArmInstruction instruction);
};