4 * Copyright (c) 2003 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <netinet/tcp.h>
40 static int gdbstub_open(int port)
42 struct sockaddr_in sockaddr;
46 fd = socket(PF_INET, SOCK_STREAM, 0);
52 /* allow fast reuse */
54 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
56 sockaddr.sin_family = AF_INET;
57 sockaddr.sin_port = htons(port);
58 sockaddr.sin_addr.s_addr = 0;
59 ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
70 /* now wait for one connection */
72 len = sizeof(sockaddr);
73 gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len);
74 if (gdbstub_fd < 0 && errno != EINTR) {
77 } else if (gdbstub_fd >= 0) {
82 /* set short latency */
84 setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
88 static int get_char(void)
94 ret = read(gdbstub_fd, &ch, 1);
96 if (errno != EINTR && errno != EAGAIN)
98 } else if (ret == 0) {
107 static void put_buffer(const uint8_t *buf, int len)
112 ret = write(gdbstub_fd, buf, len);
114 if (errno != EINTR && errno != EAGAIN)
123 static inline int fromhex(int v)
125 if (v >= '0' && v <= '9')
127 else if (v >= 'A' && v <= 'F')
129 else if (v >= 'a' && v <= 'f')
135 static inline int tohex(int v)
143 static void memtohex(char *buf, const uint8_t *mem, int len)
148 for(i = 0; i < len; i++) {
150 *q++ = tohex(c >> 4);
151 *q++ = tohex(c & 0xf);
156 static void hextomem(uint8_t *mem, const char *buf, int len)
160 for(i = 0; i < len; i++) {
161 mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
166 /* return -1 if error or EOF */
167 static int get_packet(char *buf, int buf_size)
169 int ch, len, csum, csum1;
188 if (len > buf_size - 1)
197 csum1 = fromhex(ch) << 4;
201 csum1 |= fromhex(ch);
202 if ((csum & 0xff) != csum1) {
204 put_buffer(reply, 1);
207 put_buffer(reply, 1);
212 printf("command='%s'\n", buf);
217 /* return -1 if error, 0 if OK */
218 static int put_packet(char *buf)
221 int len, csum, ch, i;
224 printf("reply='%s'\n", buf);
231 put_buffer(buf, len);
233 for(i = 0; i < len; i++) {
237 buf1[1] = tohex((csum >> 4) & 0xf);
238 buf1[2] = tohex((csum) & 0xf);
251 static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write)
257 page = addr & TARGET_PAGE_MASK;
258 l = (page + TARGET_PAGE_SIZE) - addr;
261 flags = page_get_flags(page);
262 if (!(flags & PAGE_VALID))
265 if (!(flags & PAGE_WRITE))
267 memcpy((uint8_t *)addr, buf, l);
269 if (!(flags & PAGE_READ))
271 memcpy(buf, (uint8_t *)addr, l);
280 /* port = 0 means default port */
281 int cpu_gdbstub(void *opaque, int (*main_loop)(void *opaque), int port)
285 int ret, ch, nb_regs, i, type;
287 uint8_t mem_buf[2000];
291 printf("Waiting gdb connection on port %d\n", port);
292 if (gdbstub_open(port) < 0)
294 printf("Connected\n");
296 ret = get_packet(buf, sizeof(buf));
303 snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
308 addr = strtoul(p, (char **)&p, 16);
309 env = cpu_gdbstub_get_env(opaque);
310 #if defined(TARGET_I386)
314 ret = main_loop(opaque);
315 if (ret == EXCP_DEBUG)
319 snprintf(buf, sizeof(buf), "S%02x", ret);
323 env = cpu_gdbstub_get_env(opaque);
325 addr = strtoul(p, (char **)&p, 16);
326 #if defined(TARGET_I386)
330 cpu_single_step(env, 1);
331 ret = main_loop(opaque);
332 cpu_single_step(env, 0);
333 if (ret == EXCP_DEBUG)
337 snprintf(buf, sizeof(buf), "S%02x", ret);
341 env = cpu_gdbstub_get_env(opaque);
342 registers = (void *)mem_buf;
343 #if defined(TARGET_I386)
344 for(i = 0; i < 8; i++) {
345 registers[i] = tswapl(env->regs[i]);
347 registers[8] = env->eip;
348 registers[9] = env->eflags;
349 registers[10] = env->segs[R_CS].selector;
350 registers[11] = env->segs[R_SS].selector;
351 registers[12] = env->segs[R_DS].selector;
352 registers[13] = env->segs[R_ES].selector;
353 registers[14] = env->segs[R_FS].selector;
354 registers[15] = env->segs[R_GS].selector;
357 memtohex(buf, (const uint8_t *)registers,
358 sizeof(registers[0]) * nb_regs);
362 env = cpu_gdbstub_get_env(opaque);
363 registers = (void *)mem_buf;
364 #if defined(TARGET_I386)
365 hextomem((uint8_t *)registers, p, 16 * 4);
366 for(i = 0; i < 8; i++) {
367 env->regs[i] = tswapl(registers[i]);
369 env->eip = registers[8];
370 env->eflags = registers[9];
371 #define LOAD_SEG(index, sreg)\
372 if (tswapl(registers[index]) != env->segs[sreg].selector)\
373 cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
384 addr = strtoul(p, (char **)&p, 16);
387 len = strtoul(p, NULL, 16);
388 if (memory_rw(mem_buf, addr, len, 0) != 0)
389 memset(mem_buf, 0, len);
390 memtohex(buf, mem_buf, len);
394 addr = strtoul(p, (char **)&p, 16);
397 len = strtoul(p, (char **)&p, 16);
400 hextomem(mem_buf, p, len);
401 if (memory_rw(mem_buf, addr, len, 1) != 0)
407 type = strtoul(p, (char **)&p, 16);
410 addr = strtoul(p, (char **)&p, 16);
413 len = strtoul(p, (char **)&p, 16);
414 if (type == 0 || type == 1) {
415 env = cpu_gdbstub_get_env(opaque);
416 if (cpu_breakpoint_insert(env, addr) < 0)
417 goto breakpoint_error;
425 type = strtoul(p, (char **)&p, 16);
428 addr = strtoul(p, (char **)&p, 16);
431 len = strtoul(p, (char **)&p, 16);
432 if (type == 0 || type == 1) {
433 env = cpu_gdbstub_get_env(opaque);
434 cpu_breakpoint_remove(env, addr);
437 goto breakpoint_error;
441 /* put empty packet */