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b4608c0455
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@288 c046a42c-6fe2-441c-8c8c-71466251a162
391 lines
9.4 KiB
C
391 lines
9.4 KiB
C
/*
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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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#ifdef TARGET_I386
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#include "cpu-i386.h"
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#endif
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#ifdef TARGET_ARM
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#include "cpu-arm.h"
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#endif
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#include "thunk.h"
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#include "exec.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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/* 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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/* 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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static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write)
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{
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int l, flags;
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uint32_t page;
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while (len > 0) {
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page = addr & TARGET_PAGE_MASK;
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l = (page + TARGET_PAGE_SIZE) - addr;
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if (l > len)
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l = len;
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flags = page_get_flags(page);
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if (!(flags & PAGE_VALID))
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return -1;
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if (is_write) {
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if (!(flags & PAGE_WRITE))
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return -1;
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memcpy((uint8_t *)addr, buf, l);
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} else {
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if (!(flags & PAGE_READ))
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return -1;
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memcpy(buf, (uint8_t *)addr, l);
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}
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len -= l;
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buf += l;
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addr += l;
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}
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return 0;
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}
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/* port = 0 means default port */
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int cpu_gdbstub(void *opaque, void (*main_loop)(void *opaque), int port)
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{
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CPUState *env;
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const char *p;
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int ret, ch, nb_regs, i;
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char buf[4096];
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uint8_t mem_buf[2000];
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uint32_t *registers;
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uint32_t addr, len;
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printf("Waiting gdb connection on port %d\n", port);
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if (gdbstub_open(port) < 0)
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return -1;
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printf("Connected\n");
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for(;;) {
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ret = get_packet(buf, sizeof(buf));
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if (ret < 0)
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break;
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p = buf;
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ch = *p++;
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switch(ch) {
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case '?':
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snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
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put_packet(buf);
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break;
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case 'c':
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main_loop(opaque);
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snprintf(buf, sizeof(buf), "S%02x", 0);
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put_packet(buf);
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break;
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case 'g':
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env = cpu_gdbstub_get_env(opaque);
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registers = (void *)mem_buf;
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#if defined(TARGET_I386)
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for(i = 0; i < 8; i++) {
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registers[i] = tswapl(env->regs[i]);
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}
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registers[8] = env->eip;
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registers[9] = env->eflags;
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registers[10] = env->segs[R_CS].selector;
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registers[11] = env->segs[R_SS].selector;
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registers[12] = env->segs[R_DS].selector;
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registers[13] = env->segs[R_ES].selector;
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registers[14] = env->segs[R_FS].selector;
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registers[15] = env->segs[R_GS].selector;
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nb_regs = 16;
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#endif
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memtohex(buf, (const uint8_t *)registers,
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sizeof(registers[0]) * nb_regs);
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put_packet(buf);
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break;
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case 'G':
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env = cpu_gdbstub_get_env(opaque);
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registers = (void *)mem_buf;
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#if defined(TARGET_I386)
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hextomem((uint8_t *)registers, p, 16 * 4);
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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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#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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put_packet("OK");
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break;
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case 'm':
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addr = strtoul(p, (char **)&p, 16);
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if (*p == ',')
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p++;
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len = strtoul(p, NULL, 16);
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if (memory_rw(mem_buf, addr, len, 0) != 0)
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memset(mem_buf, 0, len);
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memtohex(buf, mem_buf, len);
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put_packet(buf);
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break;
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case 'M':
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addr = strtoul(p, (char **)&p, 16);
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if (*p == ',')
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p++;
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len = strtoul(p, (char **)&p, 16);
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if (*p == ',')
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p++;
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hextomem(mem_buf, p, len);
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if (memory_rw(mem_buf, addr, len, 1) != 0)
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put_packet("ENN");
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else
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put_packet("OK");
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break;
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default:
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/* put empty packet */
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buf[0] = '\0';
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put_packet(buf);
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break;
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}
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}
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return 0;
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}
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