reg_t data;
};
+typedef struct
+{
+ uint8_t prv;
+ bool step;
+ bool ebreakm;
+ bool ebreakh;
+ bool ebreaks;
+ bool ebreaku;
+ bool halt;
+ uint8_t cause;
+} dcsr_t;
+
// architectural state of a RISC-V hart
struct state_t
{
reg_t stvec;
reg_t sptbr;
reg_t scause;
+ reg_t dpc;
+ reg_t dscratch;
+ dcsr_t dcsr;
+
uint32_t fflags;
uint32_t frm;
bool serialized; // whether timer CSRs are in a well-defined state
+ // When true, execute a single instruction and then enter debug mode. This
+ // can only be set by executing dret.
+ enum {
+ STEP_NONE,
+ STEP_STEPPING,
+ STEP_STEPPED
+ } single_step;
+
reg_t load_reservation;
#ifdef RISCV_ENABLE_COMMITLOG
#endif
};
-typedef enum {
- HR_NONE,
- HR_STEPPED, // A single step was completed
- HR_SWBP, // sbreak was executed
- HR_INTERRUPT, // Execution interrupted by debugger
- HR_CMDLINE, // Command line requested that the processor start halted
- HR_ATTACHED // Halted because a debugger attached
-} halt_reason_t;
-
// this class represents one processor in a RISC-V machine.
class processor_t : public abstract_device_t
{
public:
- processor_t(const char* isa, sim_t* sim, uint32_t id);
+ processor_t(const char* isa, sim_t* sim, uint32_t id, bool halt_on_reset=false);
~processor_t();
void set_debug(bool value);
- void set_halted(bool value, halt_reason_t reason);
- void set_single_step(bool value);
void set_histogram(bool value);
void reset(bool value);
void step(size_t n); // run for n cycles
bool load(reg_t addr, size_t len, uint8_t* bytes);
bool store(reg_t addr, size_t len, const uint8_t* bytes);
+ // When true, display disassembly of each instruction that's executed.
+ bool debug;
+
private:
sim_t* sim;
mmu_t* mmu; // main memory is always accessed via the mmu
reg_t isa;
std::string isa_string;
bool run; // !reset
- // When true, display disassembly of each instruction that's executed.
- bool debug;
- // TODO: Should this just be rolled into `run`?
- bool halted; // When true, no instructions are executed.
- halt_reason_t halt_reason; // Why is halted true?
- // When true, execute exactly one instruction (even if halted is true), then
- // set halted to true and single_step to false.
- bool single_step;
bool histogram_enabled;
+ bool halt_on_reset;
std::vector<insn_desc_t> instructions;
std::map<reg_t,uint64_t> pc_histogram;
void take_interrupt(); // take a trap if any interrupts are pending
void take_trap(trap_t& t, reg_t epc); // take an exception
void disasm(insn_t insn); // disassemble and print an instruction
+ int paddr_bits();
+
+ void enter_debug_mode(uint8_t cause);
friend class sim_t;
friend class mmu_t;
friend class rtc_t;
friend class extension_t;
- friend class gdbserver_t;
void parse_isa_string(const char* isa);
void build_opcode_map();