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/*
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* gdb server stub
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <errno.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 <signal.h> |
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#include "config.h" |
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#include "cpu.h" |
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#include "thunk.h" |
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#include "exec-all.h" |
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//#define DEBUG_GDB
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int gdbstub_fd = -1; |
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/* return 0 if OK */
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static int gdbstub_open(int port) |
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{
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struct sockaddr_in sockaddr;
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socklen_t len; |
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int fd, val, ret;
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fd = socket(PF_INET, SOCK_STREAM, 0);
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if (fd < 0) { |
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perror("socket");
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return -1; |
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} |
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|
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/* allow fast reuse */
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val = 1;
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
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sockaddr.sin_family = AF_INET; |
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sockaddr.sin_port = htons(port); |
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sockaddr.sin_addr.s_addr = 0;
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ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
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if (ret < 0) { |
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perror("bind");
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return -1; |
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} |
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ret = listen(fd, 0);
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if (ret < 0) { |
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perror("listen");
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return -1; |
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} |
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|
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/* now wait for one connection */
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for(;;) {
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len = sizeof(sockaddr);
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gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len);
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if (gdbstub_fd < 0 && errno != EINTR) { |
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perror("accept");
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return -1; |
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} else if (gdbstub_fd >= 0) { |
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break;
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} |
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} |
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/* set short latency */
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val = 1;
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setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
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return 0; |
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} |
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static int get_char(void) |
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{
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uint8_t ch; |
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int ret;
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for(;;) {
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ret = read(gdbstub_fd, &ch, 1);
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if (ret < 0) { |
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if (errno != EINTR && errno != EAGAIN)
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return -1; |
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} else if (ret == 0) { |
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return -1; |
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} else {
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break;
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} |
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} |
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return ch;
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} |
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static void put_buffer(const uint8_t *buf, int len) |
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{
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int ret;
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while (len > 0) { |
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ret = write(gdbstub_fd, buf, len); |
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if (ret < 0) { |
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if (errno != EINTR && errno != EAGAIN)
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return;
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} else {
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buf += ret; |
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len -= ret; |
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} |
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} |
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} |
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static inline int fromhex(int v) |
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{
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if (v >= '0' && v <= '9') |
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return v - '0'; |
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else if (v >= 'A' && v <= 'F') |
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return v - 'A' + 10; |
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else if (v >= 'a' && v <= 'f') |
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return v - 'a' + 10; |
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else
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return 0; |
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} |
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static inline int tohex(int v) |
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{
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if (v < 10) |
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return v + '0'; |
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else
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return v - 10 + 'a'; |
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} |
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static void memtohex(char *buf, const uint8_t *mem, int len) |
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{
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int i, c;
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char *q;
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q = buf; |
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for(i = 0; i < len; i++) { |
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c = mem[i]; |
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*q++ = tohex(c >> 4);
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*q++ = tohex(c & 0xf);
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} |
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*q = '\0';
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} |
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static void hextomem(uint8_t *mem, const char *buf, int len) |
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{
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int i;
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for(i = 0; i < len; i++) { |
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mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
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buf += 2;
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} |
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} |
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/* return -1 if error or EOF */
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static int get_packet(char *buf, int buf_size) |
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{
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int ch, len, csum, csum1;
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char reply[1]; |
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for(;;) {
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for(;;) {
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ch = get_char(); |
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if (ch < 0) |
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return -1; |
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if (ch == '$') |
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break;
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} |
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len = 0;
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csum = 0;
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for(;;) {
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ch = get_char(); |
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if (ch < 0) |
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return -1; |
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if (ch == '#') |
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break;
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if (len > buf_size - 1) |
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return -1; |
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buf[len++] = ch; |
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csum += ch; |
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} |
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buf[len] = '\0';
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ch = get_char(); |
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if (ch < 0) |
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return -1; |
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csum1 = fromhex(ch) << 4;
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ch = get_char(); |
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if (ch < 0) |
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return -1; |
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csum1 |= fromhex(ch); |
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if ((csum & 0xff) != csum1) { |
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reply[0] = '-'; |
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put_buffer(reply, 1);
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} else {
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reply[0] = '+'; |
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put_buffer(reply, 1);
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break;
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} |
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} |
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#ifdef DEBUG_GDB
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printf("command='%s'\n", buf);
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#endif
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return len;
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} |
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/* return -1 if error, 0 if OK */
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static int put_packet(char *buf) |
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{
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char buf1[3]; |
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int len, csum, ch, i;
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#ifdef DEBUG_GDB
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printf("reply='%s'\n", buf);
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#endif
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for(;;) {
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buf1[0] = '$'; |
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put_buffer(buf1, 1);
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len = strlen(buf); |
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put_buffer(buf, len); |
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csum = 0;
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for(i = 0; i < len; i++) { |
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csum += buf[i]; |
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} |
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buf1[0] = '#'; |
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buf1[1] = tohex((csum >> 4) & 0xf); |
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buf1[2] = tohex((csum) & 0xf); |
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put_buffer(buf1, 3);
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ch = get_char(); |
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if (ch < 0) |
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return -1; |
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if (ch == '+') |
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break;
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} |
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return 0; |
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} |
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#if defined(TARGET_I386)
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static void to_le32(uint8_t *p, int v) |
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{
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p[0] = v;
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p[1] = v >> 8; |
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p[2] = v >> 16; |
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p[3] = v >> 24; |
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} |
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{
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int i, fpus;
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for(i = 0; i < 8; i++) { |
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to_le32(mem_buf + i * 4, env->regs[i]);
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} |
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to_le32(mem_buf + 8 * 4, env->eip); |
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to_le32(mem_buf + 9 * 4, env->eflags); |
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to_le32(mem_buf + 10 * 4, env->segs[R_CS].selector); |
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to_le32(mem_buf + 11 * 4, env->segs[R_SS].selector); |
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to_le32(mem_buf + 12 * 4, env->segs[R_DS].selector); |
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to_le32(mem_buf + 13 * 4, env->segs[R_ES].selector); |
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to_le32(mem_buf + 14 * 4, env->segs[R_FS].selector); |
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to_le32(mem_buf + 15 * 4, env->segs[R_GS].selector); |
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/* XXX: convert floats */
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for(i = 0; i < 8; i++) { |
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memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10); |
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} |
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to_le32(mem_buf + 36 * 4, env->fpuc); |
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fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
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to_le32(mem_buf + 37 * 4, fpus); |
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to_le32(mem_buf + 38 * 4, 0); /* XXX: convert tags */ |
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to_le32(mem_buf + 39 * 4, 0); /* fiseg */ |
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to_le32(mem_buf + 40 * 4, 0); /* fioff */ |
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to_le32(mem_buf + 41 * 4, 0); /* foseg */ |
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to_le32(mem_buf + 42 * 4, 0); /* fooff */ |
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to_le32(mem_buf + 43 * 4, 0); /* fop */ |
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return 44 * 4; |
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} |
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|
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static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
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{
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uint32_t *registers = (uint32_t *)mem_buf; |
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int i;
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for(i = 0; i < 8; i++) { |
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env->regs[i] = tswapl(registers[i]); |
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} |
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env->eip = registers[8];
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env->eflags = registers[9];
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#if defined(CONFIG_USER_ONLY)
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#define LOAD_SEG(index, sreg)\
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if (tswapl(registers[index]) != env->segs[sreg].selector)\
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cpu_x86_load_seg(env, sreg, tswapl(registers[index])); |
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LOAD_SEG(10, R_CS);
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LOAD_SEG(11, R_SS);
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LOAD_SEG(12, R_DS);
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LOAD_SEG(13, R_ES);
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LOAD_SEG(14, R_FS);
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LOAD_SEG(15, R_GS);
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#endif
|
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} |
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|
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#elif defined (TARGET_PPC)
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static void to_le32(uint8_t *p, int v) |
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{
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p[3] = v;
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p[2] = v >> 8; |
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p[1] = v >> 16; |
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p[0] = v >> 24; |
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} |
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|
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{
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uint32_t tmp; |
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int i;
|
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|
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/* fill in gprs */
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for(i = 0; i < 8; i++) { |
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to_le32(mem_buf + i * 4, env->gpr[i]);
|
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} |
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/* fill in fprs */
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for (i = 0; i < 32; i++) { |
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to_le32(mem_buf + (i * 2) + 32, *((uint32_t *)&env->fpr[i])); |
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to_le32(mem_buf + (i * 2) + 33, *((uint32_t *)&env->fpr[i] + 1)); |
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} |
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/* nip, msr, ccr, lnk, ctr, xer, mq */
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to_le32(mem_buf + 96, tswapl(env->nip));
|
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to_le32(mem_buf + 97, tswapl(_load_msr()));
|
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to_le32(mem_buf + 98, 0); |
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tmp = 0;
|
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for (i = 0; i < 8; i++) |
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tmp |= env->crf[i] << (32 - (i * 4)); |
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to_le32(mem_buf + 98, tmp);
|
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to_le32(mem_buf + 99, tswapl(env->lr));
|
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to_le32(mem_buf + 100, tswapl(env->ctr));
|
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to_le32(mem_buf + 101, tswapl(_load_xer()));
|
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to_le32(mem_buf + 102, 0); |
| 350 |
|
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return 102; |
| 352 |
} |
| 353 |
|
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static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
| 355 |
{
|
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uint32_t *registers = (uint32_t *)mem_buf; |
| 357 |
int i;
|
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|
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/* fill in gprs */
|
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for (i = 0; i < 32; i++) { |
| 361 |
env->gpr[i] = tswapl(registers[i]); |
| 362 |
} |
| 363 |
/* fill in fprs */
|
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for (i = 0; i < 32; i++) { |
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*((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]); |
| 366 |
*((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]); |
| 367 |
} |
| 368 |
/* nip, msr, ccr, lnk, ctr, xer, mq */
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env->nip = tswapl(registers[96]);
|
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_store_msr(tswapl(registers[97]));
|
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registers[98] = tswapl(registers[98]); |
| 372 |
for (i = 0; i < 8; i++) |
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env->crf[i] = (registers[98] >> (32 - (i * 4))) & 0xF; |
| 374 |
env->lr = tswapl(registers[99]);
|
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env->ctr = tswapl(registers[100]);
|
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_store_xer(tswapl(registers[101]));
|
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} |
| 378 |
#else
|
| 379 |
|
| 380 |
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
| 381 |
{
|
| 382 |
return 0; |
| 383 |
} |
| 384 |
|
| 385 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
| 386 |
{
|
| 387 |
} |
| 388 |
|
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#endif
|
| 390 |
|
| 391 |
/* port = 0 means default port */
|
| 392 |
int cpu_gdbstub(void *opaque, int (*main_loop)(void *opaque), int port) |
| 393 |
{
|
| 394 |
CPUState *env; |
| 395 |
const char *p; |
| 396 |
int ret, ch, reg_size, type;
|
| 397 |
char buf[4096]; |
| 398 |
uint8_t mem_buf[2000];
|
| 399 |
uint32_t *registers; |
| 400 |
uint32_t addr, len; |
| 401 |
|
| 402 |
printf("Waiting gdb connection on port %d\n", port);
|
| 403 |
if (gdbstub_open(port) < 0) |
| 404 |
return -1; |
| 405 |
printf("Connected\n");
|
| 406 |
for(;;) {
|
| 407 |
ret = get_packet(buf, sizeof(buf));
|
| 408 |
if (ret < 0) |
| 409 |
break;
|
| 410 |
p = buf; |
| 411 |
ch = *p++; |
| 412 |
switch(ch) {
|
| 413 |
case '?': |
| 414 |
snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
| 415 |
put_packet(buf); |
| 416 |
break;
|
| 417 |
case 'c': |
| 418 |
if (*p != '\0') { |
| 419 |
addr = strtoul(p, (char **)&p, 16); |
| 420 |
env = cpu_gdbstub_get_env(opaque); |
| 421 |
#if defined(TARGET_I386)
|
| 422 |
env->eip = addr; |
| 423 |
#elif defined (TARGET_PPC)
|
| 424 |
env->nip = addr; |
| 425 |
#endif
|
| 426 |
} |
| 427 |
ret = main_loop(opaque); |
| 428 |
if (ret == EXCP_DEBUG)
|
| 429 |
ret = SIGTRAP; |
| 430 |
else
|
| 431 |
ret = 0;
|
| 432 |
snprintf(buf, sizeof(buf), "S%02x", ret); |
| 433 |
put_packet(buf); |
| 434 |
break;
|
| 435 |
case 's': |
| 436 |
env = cpu_gdbstub_get_env(opaque); |
| 437 |
if (*p != '\0') { |
| 438 |
addr = strtoul(p, (char **)&p, 16); |
| 439 |
#if defined(TARGET_I386)
|
| 440 |
env->eip = addr; |
| 441 |
#elif defined (TARGET_PPC)
|
| 442 |
env->nip = addr; |
| 443 |
#endif
|
| 444 |
} |
| 445 |
cpu_single_step(env, 1);
|
| 446 |
ret = main_loop(opaque); |
| 447 |
cpu_single_step(env, 0);
|
| 448 |
if (ret == EXCP_DEBUG)
|
| 449 |
ret = SIGTRAP; |
| 450 |
else
|
| 451 |
ret = 0;
|
| 452 |
snprintf(buf, sizeof(buf), "S%02x", ret); |
| 453 |
put_packet(buf); |
| 454 |
break;
|
| 455 |
case 'g': |
| 456 |
env = cpu_gdbstub_get_env(opaque); |
| 457 |
reg_size = cpu_gdb_read_registers(env, mem_buf); |
| 458 |
memtohex(buf, mem_buf, reg_size); |
| 459 |
put_packet(buf); |
| 460 |
break;
|
| 461 |
case 'G': |
| 462 |
env = cpu_gdbstub_get_env(opaque); |
| 463 |
registers = (void *)mem_buf;
|
| 464 |
len = strlen(p) / 2;
|
| 465 |
hextomem((uint8_t *)registers, p, len); |
| 466 |
cpu_gdb_write_registers(env, mem_buf, len); |
| 467 |
put_packet("OK");
|
| 468 |
break;
|
| 469 |
case 'm': |
| 470 |
env = cpu_gdbstub_get_env(opaque); |
| 471 |
addr = strtoul(p, (char **)&p, 16); |
| 472 |
if (*p == ',') |
| 473 |
p++; |
| 474 |
len = strtoul(p, NULL, 16); |
| 475 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) |
| 476 |
memset(mem_buf, 0, len);
|
| 477 |
memtohex(buf, mem_buf, len); |
| 478 |
put_packet(buf); |
| 479 |
break;
|
| 480 |
case 'M': |
| 481 |
env = cpu_gdbstub_get_env(opaque); |
| 482 |
addr = strtoul(p, (char **)&p, 16); |
| 483 |
if (*p == ',') |
| 484 |
p++; |
| 485 |
len = strtoul(p, (char **)&p, 16); |
| 486 |
if (*p == ',') |
| 487 |
p++; |
| 488 |
hextomem(mem_buf, p, len); |
| 489 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) |
| 490 |
put_packet("ENN");
|
| 491 |
else
|
| 492 |
put_packet("OK");
|
| 493 |
break;
|
| 494 |
case 'Z': |
| 495 |
type = strtoul(p, (char **)&p, 16); |
| 496 |
if (*p == ',') |
| 497 |
p++; |
| 498 |
addr = strtoul(p, (char **)&p, 16); |
| 499 |
if (*p == ',') |
| 500 |
p++; |
| 501 |
len = strtoul(p, (char **)&p, 16); |
| 502 |
if (type == 0 || type == 1) { |
| 503 |
env = cpu_gdbstub_get_env(opaque); |
| 504 |
if (cpu_breakpoint_insert(env, addr) < 0) |
| 505 |
goto breakpoint_error;
|
| 506 |
put_packet("OK");
|
| 507 |
} else {
|
| 508 |
breakpoint_error:
|
| 509 |
put_packet("ENN");
|
| 510 |
} |
| 511 |
break;
|
| 512 |
case 'z': |
| 513 |
type = strtoul(p, (char **)&p, 16); |
| 514 |
if (*p == ',') |
| 515 |
p++; |
| 516 |
addr = strtoul(p, (char **)&p, 16); |
| 517 |
if (*p == ',') |
| 518 |
p++; |
| 519 |
len = strtoul(p, (char **)&p, 16); |
| 520 |
if (type == 0 || type == 1) { |
| 521 |
env = cpu_gdbstub_get_env(opaque); |
| 522 |
cpu_breakpoint_remove(env, addr); |
| 523 |
put_packet("OK");
|
| 524 |
} else {
|
| 525 |
goto breakpoint_error;
|
| 526 |
} |
| 527 |
break;
|
| 528 |
case 'Q': |
| 529 |
if (!strncmp(p, "Tinit", 5)) { |
| 530 |
/* init traces */
|
| 531 |
put_packet("OK");
|
| 532 |
} else if (!strncmp(p, "TStart", 6)) { |
| 533 |
/* start log (gdb 'tstart' command) */
|
| 534 |
env = cpu_gdbstub_get_env(opaque); |
| 535 |
tb_flush(env); |
| 536 |
cpu_set_log(CPU_LOG_ALL); |
| 537 |
put_packet("OK");
|
| 538 |
} else if (!strncmp(p, "TStop", 5)) { |
| 539 |
/* stop log (gdb 'tstop' command) */
|
| 540 |
cpu_set_log(0);
|
| 541 |
put_packet("OK");
|
| 542 |
} else {
|
| 543 |
goto unknown_command;
|
| 544 |
} |
| 545 |
break;
|
| 546 |
default:
|
| 547 |
unknown_command:
|
| 548 |
/* put empty packet */
|
| 549 |
buf[0] = '\0'; |
| 550 |
put_packet(buf); |
| 551 |
break;
|
| 552 |
} |
| 553 |
} |
| 554 |
return 0; |
| 555 |
} |