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#ifndef _RISCV_GDBSERVER_H
#define _RISCV_GDBSERVER_H
#include <stdint.h>
class sim_t;
template <typename T>
class circular_buffer_t
{
public:
// The buffer can store capacity-1 data elements.
circular_buffer_t(unsigned int capacity) : data(new T[capacity]),
start(0), end(0), capacity(capacity) {}
circular_buffer_t() : start(0), end(0), capacity(0) {}
~circular_buffer_t() { delete data; }
T *data;
unsigned int start; // Data start, inclusive.
unsigned int end; // Data end, exclusive.
unsigned int capacity; // Size of the buffer.
unsigned int size() const;
bool empty() const { return start == end; }
bool full() const { return ((end+1) % capacity) == start; }
// Return size and address of the block of RAM where more data can be copied
// to be added to the buffer.
unsigned int contiguous_empty_size() const;
T *contiguous_empty() { return data + end; }
void data_added(unsigned int bytes);
unsigned int contiguous_data_size() const;
T *contiguous_data() { return data + start; }
// Tell the buffer that some bytes were consumed from the start of the
// buffer.
void consume(unsigned int bytes);
void reset();
T operator[](unsigned int i) const { return data[(start + i) % capacity]; }
void append(const T *src, unsigned int count);
};
class gdbserver_t
{
public:
// Create a new server, listening for connections from localhost on the given
// port.
gdbserver_t(uint16_t port, sim_t *sim);
// Process all pending messages from a client.
void handle();
void handle_packet(const std::vector<uint8_t> &packet);
void handle_interrupt();
void handle_halt_reason(const std::vector<uint8_t> &packet);
void handle_general_registers_read(const std::vector<uint8_t> &packet);
void handle_memory_read(const std::vector<uint8_t> &packet);
void handle_memory_binary_write(const std::vector<uint8_t> &packet);
void handle_register_read(const std::vector<uint8_t> &packet);
void handle_continue(const std::vector<uint8_t> &packet);
void handle_kill(const std::vector<uint8_t> &packet);
void handle_extended(const std::vector<uint8_t> &packet);
private:
sim_t *sim;
int socket_fd;
int client_fd;
circular_buffer_t<uint8_t> recv_buf;
circular_buffer_t<uint8_t> send_buf;
bool expect_ack;
bool extended_mode;
// Read pending data from the client.
void read();
void write();
// Accept a new client if there isn't one already connected.
void accept();
// Process all complete requests in recv_buf.
void process_requests();
// Add the given message to send_buf.
void send(const char* msg);
// Hex-encode a 64-bit value, and send it to gcc in target byte order (little
// endian).
void send(uint64_t value);
// Hex-encode a 32-bit value, and send it to gcc in target byte order (little
// endian).
void send(uint32_t value);
void send_packet(const char* data);
uint8_t running_checksum;
void send_running_checksum();
};
#endif
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