gdb.c

嵌入式开发板连接程序源码

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>

/* Libraries for JTAG proxy server.  */
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <inttypes.h>
#include <errno.h>

#include "gdb.h" /* partially copied from gdb/config/or1k */
#include "jp2.h"


/* connection to jp2 routines */
int gdb_chain = -1;

int gdb_read_reg(unsigned long adr, unsigned long *data) {
  switch (gdb_chain) {
    SC_RISC_DEBUG: return dbg_cpu_read32(adr, data) ? ERR_CRC : ERR_NONE;
    SC_REGISTER:   return dbg_cpu_read_reg(adr, data) ? ERR_CRC : ERR_NONE;
    SC_WISHBONE:   return dbg_wb_read32(adr, data) ? ERR_CRC : ERR_NONE;
    default:       return JTAG_PROXY_INVALID_CHAIN;
  }
}

int gdb_write_reg(unsigned long adr, unsigned long data) {
  switch (gdb_chain) {
    SC_RISC_DEBUG: return dbg_cpu_write32(adr, data) ? ERR_CRC : ERR_NONE;
    SC_REGISTER:   return dbg_cpu_write_reg(adr, data) ? ERR_CRC : ERR_NONE;
    SC_WISHBONE:   return dbg_wb_write32(adr, data) ? ERR_CRC : ERR_NONE;
    default:       return JTAG_PROXY_INVALID_CHAIN;
  }
}

int gdb_read_block(unsigned long adr, unsigned long *data, int len) {
  switch (gdb_chain) {
    SC_WISHBONE:   return dbg_wb_read_block32(adr, data, len) ? ERR_CRC : ERR_NONE;
    default:       return JTAG_PROXY_INVALID_CHAIN;
  }
}

int gdb_write_block(unsigned long adr, unsigned long *data, int len) {
  switch (gdb_chain) {
    SC_WISHBONE:   return dbg_wb_write_block32(adr, data, len) ? ERR_CRC : ERR_NONE;
    default:       return JTAG_PROXY_INVALID_CHAIN;
  }
}

int gdb_set_chain(int chain) {
  switch (gdb_chain) {
    SC_RISC_DEBUG:
    SC_REGISTER:
    SC_WISHBONE:   gdb_chain = chain;
                   return ERR_NONE;
    default:       return JTAG_PROXY_INVALID_CHAIN;
  }
}



/************************
   JTAG Server Routines
 ************************/

unsigned int serverIP = 0;
unsigned int serverPort = 0;
unsigned int server_fd = 0;
unsigned int gdb_fd = 0;
static int gdb_read(void*, int);
static int gdb_write(void*, int);
static void ProtocolClean(int, int32_t);

static int tcp_level = 0;

/* Added by CZ 24/05/01 */
int GetServerSocket(const char* name, const char* proto, int port) {
  struct servent *service;
  struct protoent *protocol;
  struct sockaddr_in sa;
  struct hostent *hp;  
  int sockfd;
  char myname[256];
  int flags;
  char sTemp[256];

  /* First, get the protocol number of TCP */
  if (!(protocol = getprotobyname(proto))) {
    sprintf(sTemp, "Unable to load protocol \"%s\"", proto);
    perror(sTemp);
    return 0;
  }
  tcp_level = protocol->p_proto; /* Save for later */

  /* If we weren't passed a non standard port, get the port
     from the services directory. */
  if (!port && (service = getservbyname(name, protocol->p_name)))
    port = ntohs(service->s_port);
 
  /* Create the socket using the TCP protocol */
  if ((sockfd = socket(PF_INET, SOCK_STREAM, protocol->p_proto)) < 0) {
    perror("Unable to create socket");
    return 0;
  }
 
  flags = 1;
  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&flags, sizeof(int)) < 0) {
    sprintf(sTemp, "Can not set SO_REUSEADDR option on socket %d", sockfd);
    perror(sTemp);
    close(sockfd);
    return 0;
  }

  /* The server should also be non blocking. Get the current flags. */
  if((flags = fcntl(sockfd, F_GETFL, 0)) < 0) {
    sprintf(sTemp, "Unable to get flags for socket %d", sockfd);
    perror(sTemp);
    close(sockfd);
    return 0;
  }

  /* Set the nonblocking flag */
  if(fcntl(sockfd, F_SETFL, flags | O_NONBLOCK) < 0) {
    sprintf(sTemp, "Unable to set flags for socket %d to value 0x%08x", 
                    sockfd, flags | O_NONBLOCK);
    perror(sTemp);
    close(sockfd);
    return 0;
  }

  /* Find out what our address is */
  memset(&sa, 0, sizeof(struct sockaddr_in));
  gethostname(myname, sizeof(myname));
  if(!(hp = gethostbyname(myname))) {
    perror("Unable to read hostname");
    close(sockfd);
    return 0;
  }
 
  /* Bind our socket to the appropriate address */
  sa.sin_family = hp->h_addrtype;
  sa.sin_port = htons(port);
  if(bind(sockfd, (struct sockaddr*)&sa, sizeof(struct sockaddr_in)) < 0) {
    sprintf(sTemp, "Unable to bind socket %d to port %d", sockfd, port);
    perror(sTemp);
    close(sockfd);
    return 0;
  }
  serverIP = sa.sin_addr.s_addr;
  flags = sizeof(struct sockaddr_in);
  if(getsockname(sockfd, (struct sockaddr*)&sa, &flags) < 0) {
    sprintf(sTemp, "Unable to get socket information for socket %d", sockfd);
    perror(sTemp);
    close(sockfd);
    return 0;
  }
  serverPort = ntohs(sa.sin_port);

  /* Set the backlog to 1 connections */
  if(listen(sockfd, 1) < 0) {
    sprintf(sTemp, "Unable to set backlog on socket %d to %d", sockfd, 1);
    perror(sTemp);
    close(sockfd);
    return 0;
  }

  return sockfd;
}

void HandleServerSocket(Boolean block) {
  struct pollfd fds[2];
  int n;
  
rebuild:
  n = 0;
  if(!server_fd && !gdb_fd) return;

  if(server_fd) {
    fds[n].fd = server_fd;
    fds[n].events = POLLIN;
    fds[n++].revents = 0;
  }
  if(gdb_fd) {
    fds[n].fd = gdb_fd;
    fds[n].events = POLLIN;
    fds[n++].revents = 0;
  }

  while(1) {
  switch(poll(fds, n, -1)) {
    case 0:
    case -1:
      if(errno == EINTR) continue;
      perror("poll");
      server_fd = 0;
      return;
    default:
      /* Make sure to handle the gdb port first! */
      if (gdb_fd && (fds[0].revents && !server_fd || fds[1].revents && server_fd)) {
        int revents = server_fd ? fds[1].revents : fds[0].revents;
        if (revents & POLLIN) GDBRequest();
        else {/* Error Occurred */
          fprintf(stderr, "Received flags 0x%08x on gdb socket. Shutting down.\n", revents);
          close(gdb_fd);
          gdb_fd = 0;
        }
      }
      if(fds[0].revents && server_fd) {
        if(fds[0].revents & POLLIN) {
          JTAGRequest();
          goto rebuild;
        } else { /* Error Occurred */
            fprintf(stderr, "Received flags 0x%08x on server. Shutting down.\n", fds[0].revents);
            close(server_fd);
            server_fd = 0;
            serverPort = 0;
            serverIP = 0;
            return;
          }
        }
      break;
    } /* End of switch statement */
  } /* End of while statement */
}

void JTAGRequest() {
  struct sockaddr_in sa;
  struct sockaddr* addr = (struct sockaddr*)&sa;
  int n = sizeof(struct sockaddr_in);
  int fd = accept(server_fd, addr, &n);
  int on_off = 0; /* Turn off Nagel's algorithm on the socket */
  int flags;
  char sTemp[256];

  if(fd < 0) {
    /* This is valid, because a connection could have started, 
       and then terminated due to a protocol error or user
       initiation before the accept could take place. */
    if(errno != EWOULDBLOCK && errno != EAGAIN) {
      perror("accept");
      close(server_fd);
      server_fd = 0;
      serverPort = 0;
      serverIP = 0;
    }
    return;
  }

  if(gdb_fd) {
    close(fd);
    return;
  }

  if((flags = fcntl(fd, F_GETFL,0)) < 0) {
    sprintf(sTemp, "Unable to get flags for gdb socket %d", fd);
    perror(sTemp);
    close(fd);
    return;
  }
  
  if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
    sprintf(sTemp, "Unable to set flags for gdb socket %d to value 0x%08x", 
      fd, flags | O_NONBLOCK);
    perror(sTemp);
    close(fd);
    return;
  }

  if(setsockopt(fd, tcp_level, TCP_NODELAY, &on_off, sizeof(int)) < 0) {
    sprintf(sTemp, "Unable to disable Nagel's algorithm for socket %d.\nsetsockopt", fd);
    perror(sTemp);
    close(fd);
    return;
  }

  gdb_fd = fd;
}