reg_t data;
};
+typedef struct
+{
+ uint8_t prv;
+ bool step;
+ bool debugint;
+ 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 mepc;
reg_t mbadaddr;
reg_t mscratch;
+ reg_t mtvec;
reg_t mcause;
reg_t minstret;
reg_t mie;
reg_t stvec;
reg_t sptbr;
reg_t scause;
- reg_t tohost;
- reg_t fromhost;
+ 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
#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
{
~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
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;
std::vector<insn_desc_t> instructions;
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();