703 lines
18 KiB
C++
703 lines
18 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <netdb.h>
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#define LOG_THIS genlog->
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#define IFDBG(x) x
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static int last_stop_reason = GDBSTUB_STOP_NO_REASON;
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#define GDBSTUB_EXECUTION_BREAKPOINT (0xac1)
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#define GDBSTUB_TRACE (0xac2)
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#define GDBSTUB_USER_BREAK (0xac3)
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static int listen_socket_fd;
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static int socket_fd;
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static int hex(char ch)
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{
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if ((ch >= 'a') && (ch <= 'f')) return(ch - 'a' + 10);
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if ((ch >= '0') && (ch <= '9')) return(ch - '0');
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if ((ch >= 'A') && (ch <= 'F')) return(ch - 'A' + 10);
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return(-1);
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}
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static void put_debug_char(char ch)
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{
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send(socket_fd, &ch, 1, 0);
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}
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static char get_debug_char(void)
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{
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char ch;
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recv(socket_fd, &ch, 1, 0);
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return(ch);
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}
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static const char hexchars[]="0123456789abcdef";
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static void put_reply(char* buffer)
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{
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unsigned char csum;
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int i;
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BX_DEBUG (("put_buffer %s", buffer));
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do
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{
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put_debug_char('$');
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csum = 0;
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i = 0;
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while (buffer[i] != 0)
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{
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put_debug_char(buffer[i]);
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csum = csum + buffer[i];
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i++;
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}
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put_debug_char('#');
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put_debug_char(hexchars[csum >> 4]);
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put_debug_char(hexchars[csum % 16]);
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} while (get_debug_char() != '+');
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}
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static void get_command(char* buffer)
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{
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unsigned char checksum;
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unsigned char xmitcsum;
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char ch;
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unsigned int count;
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unsigned int i;
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do
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{
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while ((ch = get_debug_char()) != '$');
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checksum = 0;
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xmitcsum = 0;
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count = 0;
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while (1)
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{
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ch = get_debug_char();
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if (ch == '#') break;
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checksum = checksum + ch;
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buffer[count] = ch;
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count++;
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}
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buffer[count] = 0;
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if (ch == '#')
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{
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xmitcsum = hex(get_debug_char()) << 4;
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xmitcsum += hex(get_debug_char());
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if (checksum != xmitcsum)
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{
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BX_INFO (("Bad checksum"));
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}
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}
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if (checksum != xmitcsum)
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{
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put_debug_char('-');
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}
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else
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{
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put_debug_char('+');
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if (buffer[2] == ':')
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{
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put_debug_char(buffer[0]);
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put_debug_char(buffer[1]);
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count = strlen(buffer);
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for (i = 3; i <= count; i++)
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{
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buffer[i - 3] = buffer[i];
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}
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}
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}
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} while (checksum != xmitcsum);
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}
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void hex2mem(char* buf, unsigned char* mem, int count)
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{
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int i;
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unsigned char ch;
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for (i = 0; i<count; i++)
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{
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ch = hex(*buf++) << 4;
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ch = ch + hex(*buf++);
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*mem = ch;
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mem++;
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}
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}
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char* mem2hex(char* mem, char* buf, int count)
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{
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int i;
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unsigned char ch;
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for (i = 0; i<count; i++)
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{
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ch = *mem;
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mem++;
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*buf = hexchars[ch >> 4];
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buf++;
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*buf = hexchars[ch % 16];
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buf++;
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}
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*buf = 0;
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return(buf);
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}
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static int continue_thread = -1;
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static int other_thread = 0;
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#define NUMREGS (16)
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#define NUMREGSBYTES (NUMREGS * 4)
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static int registers[NUMREGS];
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#define MAX_BREAKPOINTS (255)
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static int breakpoints[MAX_BREAKPOINTS] = {0,};
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static int nr_breakpoints = 0;
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static int stub_trace_flag = 0;
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static int instr_count = 0;
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static int saved_eip = 0;
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int bx_gdbstub_check(unsigned int eip)
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{
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unsigned int i;
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unsigned char ch;
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long arg;
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int r;
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fd_set fds;
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struct timeval tv = {0, 0};
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instr_count++;
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if ((instr_count % 500) == 0)
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{
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#ifndef __CYGWIN__
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arg = fcntl(socket_fd, F_GETFL);
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fcntl(socket_fd, F_SETFL, arg | O_NONBLOCK);
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r = recv(socket_fd, &ch, 1, 0);
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fcntl(socket_fd, F_SETFL, arg);
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#else
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FD_ZERO(&fds);
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FD_SET(socket_fd, &fds);
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r = select(socket_fd + 1, &fds, NULL, NULL, &tv);
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if (r == 1)
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{
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r = recv(socket_fd, &ch, 1, 0);
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}
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#endif
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if (r == 1)
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{
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BX_INFO (("Got byte %x", (unsigned int)ch));
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last_stop_reason = GDBSTUB_USER_BREAK;
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return(GDBSTUB_USER_BREAK);
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}
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}
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// why is trace before breakpoints? does that mean it would never
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// hit a breakpoint during tracing?
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if (stub_trace_flag == 1)
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{
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last_stop_reason = GDBSTUB_TRACE;
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return(GDBSTUB_TRACE);
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}
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for (i = 0; i < nr_breakpoints; i++)
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{
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if (eip == breakpoints[i])
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{
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BX_INFO (("found breakpoint at %x", eip));
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last_stop_reason = GDBSTUB_EXECUTION_BREAKPOINT;
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return(GDBSTUB_EXECUTION_BREAKPOINT);
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}
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}
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last_stop_reason = GDBSTUB_STOP_NO_REASON;
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return(GDBSTUB_STOP_NO_REASON);
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}
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static int remove_breakpoint(int addr, int len)
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{
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unsigned int i;
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if (len != 1)
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{
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return(0);
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}
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for (i = 0; i < MAX_BREAKPOINTS; i++)
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{
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if (breakpoints[i] == addr)
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{
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BX_INFO (("Removing breakpoint at %x", addr));
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breakpoints[i] = 0;
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return(1);
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}
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}
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return(0);
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}
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static void insert_breakpoint(int addr)
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{
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unsigned int i;
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BX_INFO (("setting breakpoint at %x", addr));
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for (i = 0; i < MAX_BREAKPOINTS; i++)
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{
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if (breakpoints[i] == 0)
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{
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breakpoints[i] = addr;
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if (i >= nr_breakpoints)
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{
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nr_breakpoints = i + 1;
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}
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return;
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}
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}
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BX_INFO (("No slot for breakpoint"));
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}
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static void write_signal(char* buf, int signal)
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{
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buf[0] = hexchars[signal >> 4];
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buf[1] = hexchars[signal % 16];
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buf[2] = 0;
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}
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static int access_linear(Bit32u laddress,
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unsigned len,
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unsigned int rw,
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Bit8u* data)
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{
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Bit32u phys;
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bx_bool valid;
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if (((laddress & 0xfff) + len) > 4096)
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{
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valid = access_linear(laddress,
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4096 - (laddress & 0xfff),
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rw,
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data);
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if (!valid)
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{
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return(valid);
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}
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valid = access_linear(laddress,
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len + (laddress & 0xfff) - 4096,
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rw,
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(Bit8u *)((unsigned int)data +
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4096 - (laddress & 0xfff)));
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return(valid);
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}
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BX_CPU(0)->dbg_xlate_linear2phy((Bit32u)laddress,
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(Bit32u*)&phys,
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(bx_bool*)&valid);
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if (!valid)
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{
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return(0);
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}
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if (rw == BX_READ)
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{
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valid = BX_MEM(0)->dbg_fetch_mem(phys, len, data);
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}
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else
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{
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valid = BX_MEM(0)->dbg_set_mem(phys, len, data);
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}
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return(valid);
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}
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static void debug_loop(void)
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{
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char buffer[255];
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char obuf[255];
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int ne;
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unsigned char mem[255];
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ne = 0;
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while (ne == 0)
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{
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get_command(buffer);
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BX_DEBUG (("get_buffer %s", buffer));
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switch (buffer[0])
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{
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case 'c':
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{
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char buf[255];
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int new_eip;
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if (buffer[1] != 0)
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{
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new_eip = atoi(buffer + 1);
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BX_INFO (("continuing at %x", new_eip));
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for (int i=0; i<BX_SMP_PROCESSORS; i++) {
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BX_CPU(i)->invalidate_prefetch_q();
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}
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saved_eip = EIP;
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BX_CPU(0)->dword.eip = new_eip;
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}
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stub_trace_flag = 0;
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bx_cpu.cpu_loop(-1);
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DEV_vga_refresh();
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if (buffer[1] != 0)
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{
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bx_cpu.invalidate_prefetch_q();
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BX_CPU_THIS_PTR dword.eip = saved_eip;
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}
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BX_INFO (("stopped with %x", last_stop_reason));
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buf[0] = 'S';
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if (last_stop_reason == GDBSTUB_EXECUTION_BREAKPOINT ||
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last_stop_reason == GDBSTUB_TRACE)
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{
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write_signal(&buf[1], SIGTRAP);
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}
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else
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{
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write_signal(&buf[1], 0);
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}
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put_reply(buf);
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break;
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}
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case 's':
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{
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char buf[255];
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BX_INFO (("stepping"));
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stub_trace_flag = 1;
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bx_cpu.cpu_loop(-1);
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DEV_vga_refresh();
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stub_trace_flag = 0;
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BX_INFO (("stopped with %x", last_stop_reason));
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buf[0] = 'S';
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if (last_stop_reason == GDBSTUB_EXECUTION_BREAKPOINT ||
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last_stop_reason == GDBSTUB_TRACE)
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{
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write_signal(&buf[1], SIGTRAP);
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}
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else
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{
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write_signal(&buf[1], SIGTRAP);
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}
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put_reply(buf);
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break;
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}
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case 'M':
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{
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int addr;
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int len;
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unsigned char mem[255];
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char* ebuf;
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addr = strtoul(&buffer[1], &ebuf, 16);
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len = strtoul(ebuf + 1, &ebuf, 16);
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hex2mem(ebuf + 1, mem, len);
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if (len == 1 && mem[0] == 0xcc)
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{
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insert_breakpoint(addr);
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put_reply("OK");
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}
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else if (remove_breakpoint(addr, len))
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{
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put_reply("OK");
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}
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else
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{
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if (access_linear(addr,
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len,
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BX_WRITE,
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mem))
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{
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put_reply("OK");
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}
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else
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{
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put_reply("ENN");
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}
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}
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break;
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}
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case 'm':
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{
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int addr;
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int len;
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char* ebuf;
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addr = strtoul(&buffer[1], &ebuf, 16);
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len = strtoul(ebuf + 1, NULL, 16);
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BX_INFO (("addr %x len %x", addr, len));
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access_linear(addr,
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len,
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BX_READ,
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mem);
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mem2hex((char *)mem, obuf, len);
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put_reply(obuf);
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break;
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}
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case 'P':
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{
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int reg;
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int value;
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char* ebuf;
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reg = strtoul(&buffer[1], &ebuf, 16);
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value = ntohl(strtoul(ebuf + 1, &ebuf, 16));
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BX_INFO (("reg %d set to %x", reg, value));
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switch (reg)
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{
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case 1:
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EAX = value;
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break;
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case 2:
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ECX = value;
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break;
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case 3:
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EBX = value;
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break;
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case 4:
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ESP = value;
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break;
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case 5:
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EBP = value;
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break;
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case 6:
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ESI = value;
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break;
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case 7:
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EDI = value;
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break;
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case 8:
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EIP = value;
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BX_CPU_THIS_PTR invalidate_prefetch_q();
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break;
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default:
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break;
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}
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put_reply("OK");
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break;
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}
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case 'g':
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registers[0] = EAX;
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registers[1] = ECX;
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registers[2] = EDX;
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registers[3] = EBX;
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registers[4] = ESP;
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registers[5] = EBP;
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registers[6] = ESI;
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registers[7] = EDI;
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if (last_stop_reason == GDBSTUB_EXECUTION_BREAKPOINT)
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{
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registers[8] = EIP + 1;
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}
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else
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{
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registers[8] = EIP;
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}
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registers[9] = BX_CPU_THIS_PTR read_eflags();
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registers[10] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value;
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registers[11] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value;
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registers[12] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.value;
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registers[13] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.value;
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registers[14] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.value;
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registers[15] =
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.value;
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mem2hex((char *)registers, obuf, NUMREGSBYTES);
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put_reply(obuf);
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break;
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case '?':
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sprintf(obuf, "S%02x", SIGTRAP);
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put_reply(obuf);
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break;
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case 'H':
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if (buffer[1] == 'c')
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{
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continue_thread = strtol(&buffer[2], NULL, 16);
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put_reply("OK");
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}
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else if (buffer[1] == 'g')
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{
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other_thread = strtol(&buffer[2], NULL, 16);
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put_reply("OK");
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}
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else
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{
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put_reply("ENN");
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}
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break;
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case 'q':
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if (buffer[1] == 'C')
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{
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sprintf(obuf,"%Lx", 1);
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put_reply(obuf);
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}
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else if (strncmp(&buffer[1], "Offsets", strlen("Offsets")) == 0)
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{
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sprintf(obuf,
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"Text=%x;Data=%x;Bss=%x",
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bx_options.gdbstub.text_base,
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bx_options.gdbstub.data_base,
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bx_options.gdbstub.bss_base);
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put_reply(obuf);
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}
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else
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{
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put_reply("ENN");
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}
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break;
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case 'k':
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BX_PANIC (("Debugger asked us to quit\n"));
|
|
break;
|
|
|
|
default:
|
|
put_reply("");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void wait_for_connect(int portn)
|
|
{
|
|
struct sockaddr_in sockaddr;
|
|
socklen_t sockaddr_len;
|
|
struct protoent *protoent;
|
|
int r;
|
|
int opt;
|
|
|
|
listen_socket_fd = socket(PF_INET, SOCK_STREAM, 0);
|
|
if (listen_socket_fd == -1)
|
|
{
|
|
BX_PANIC (("Failed to create socket\n"));
|
|
exit(1);
|
|
}
|
|
|
|
/* Allow rapid reuse of this port */
|
|
opt = 1;
|
|
r = setsockopt(listen_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
|
|
if (r == -1)
|
|
{
|
|
BX_INFO (("setsockopt(SO_REUSEADDR) failed\n"));
|
|
}
|
|
|
|
memset (&sockaddr, '\000', sizeof sockaddr);
|
|
#if BX_HAVE_SOCKADDR_IN_SIN_LEN
|
|
// if you don't have sin_len change that to #if 0. This is the subject of
|
|
// bug [ 626840 ] no 'sin_len' in 'struct sockaddr_in'.
|
|
sockaddr.sin_len = sizeof sockaddr;
|
|
#endif
|
|
sockaddr.sin_family = AF_INET;
|
|
sockaddr.sin_port = htons(portn);
|
|
sockaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
|
|
r = bind(listen_socket_fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
|
|
if (r == -1)
|
|
{
|
|
BX_PANIC (("Failed to bind socket\n"));
|
|
}
|
|
|
|
r = listen(listen_socket_fd, 0);
|
|
if (r == -1)
|
|
{
|
|
BX_PANIC (("Failed to listen on socket\n"));
|
|
}
|
|
|
|
sockaddr_len = sizeof sockaddr;
|
|
socket_fd = accept(listen_socket_fd, (struct sockaddr *)&sockaddr, &sockaddr_len);
|
|
if (socket_fd == -1)
|
|
{
|
|
BX_PANIC (("Failed to accept on socket\n"));
|
|
}
|
|
close(listen_socket_fd);
|
|
|
|
protoent = getprotobyname ("tcp");
|
|
if (!protoent)
|
|
{
|
|
BX_INFO (("getprotobyname (\"tcp\") failed\n"));
|
|
return;
|
|
}
|
|
|
|
/* Disable Nagle - allow small packets to be sent without delay. */
|
|
opt = 1;
|
|
r = setsockopt (socket_fd, protoent->p_proto, TCP_NODELAY, &opt, sizeof(opt));
|
|
if (r == -1)
|
|
{
|
|
BX_INFO (("setsockopt(TCP_NODELAY) failed\n"));
|
|
}
|
|
}
|
|
|
|
void bx_gdbstub_init(int argc, char* argv[])
|
|
{
|
|
int portn = bx_options.gdbstub.port;
|
|
|
|
bx_init_hardware();
|
|
|
|
/* Wait for connect */
|
|
|
|
printf("Waiting for gdb connection on localhost:%d\n", portn);
|
|
wait_for_connect(portn);
|
|
|
|
/* Do debugger command loop */
|
|
debug_loop();
|
|
|
|
/* CPU loop */
|
|
bx_cpu.cpu_loop(-1);
|
|
}
|