git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@692 c046a42c-6fe2-441c-8c8c-71466251a162
589 lines
14 KiB
C
589 lines
14 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 "vl.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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//#define DEBUG_GDB
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enum RSState {
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RS_IDLE,
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RS_GETLINE,
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RS_CHKSUM1,
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RS_CHKSUM2,
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};
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static int gdbserver_fd;
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typedef struct GDBState {
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enum RSState state;
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int fd;
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char line_buf[4096];
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int line_buf_index;
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int line_csum;
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} GDBState;
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static int get_char(GDBState *s)
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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(s->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(GDBState *s, 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(s->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, 0 if OK */
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static int put_packet(GDBState *s, 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(s, buf1, 1);
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len = strlen(buf);
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put_buffer(s, 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(s, buf1, 3);
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ch = get_char(s);
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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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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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#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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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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/* 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);
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return 102;
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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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/* fill in gprs */
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for (i = 0; i < 32; i++) {
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env->gpr[i] = tswapl(registers[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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*((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
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*((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
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}
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/* 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]);
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for (i = 0; i < 8; i++)
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env->crf[i] = (registers[98] >> (32 - (i * 4))) & 0xF;
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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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}
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#else
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
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{
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return 0;
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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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}
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#endif
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/* port = 0 means default port */
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static int gdb_handle_packet(GDBState *s, const char *line_buf)
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{
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CPUState *env = cpu_single_env;
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const char *p;
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int ch, reg_size, type;
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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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#ifdef DEBUG_GDB
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printf("command='%s'\n", line_buf);
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#endif
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p = line_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(s, buf);
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break;
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case 'c':
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if (*p != '\0') {
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addr = strtoul(p, (char **)&p, 16);
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#if defined(TARGET_I386)
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env->eip = addr;
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#elif defined (TARGET_PPC)
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env->nip = addr;
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#endif
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}
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vm_start();
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break;
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case 's':
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if (*p != '\0') {
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addr = strtoul(p, (char **)&p, 16);
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#if defined(TARGET_I386)
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env->eip = addr;
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#elif defined (TARGET_PPC)
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env->nip = addr;
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#endif
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}
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cpu_single_step(env, 1);
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vm_start();
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break;
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case 'g':
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reg_size = cpu_gdb_read_registers(env, mem_buf);
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memtohex(buf, mem_buf, reg_size);
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put_packet(s, buf);
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break;
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case 'G':
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registers = (void *)mem_buf;
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len = strlen(p) / 2;
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hextomem((uint8_t *)registers, p, len);
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cpu_gdb_write_registers(env, mem_buf, len);
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put_packet(s, "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 (cpu_memory_rw_debug(env, addr, mem_buf, 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(s, 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 (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
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put_packet(s, "ENN");
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else
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put_packet(s, "OK");
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break;
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case 'Z':
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type = strtoul(p, (char **)&p, 16);
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if (*p == ',')
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p++;
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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 (type == 0 || type == 1) {
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if (cpu_breakpoint_insert(env, addr) < 0)
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goto breakpoint_error;
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put_packet(s, "OK");
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} else {
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breakpoint_error:
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put_packet(s, "ENN");
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}
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break;
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case 'z':
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type = strtoul(p, (char **)&p, 16);
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if (*p == ',')
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p++;
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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 (type == 0 || type == 1) {
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cpu_breakpoint_remove(env, addr);
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put_packet(s, "OK");
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} else {
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goto breakpoint_error;
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}
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break;
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default:
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// unknown_command:
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/* put empty packet */
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buf[0] = '\0';
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put_packet(s, buf);
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break;
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}
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return RS_IDLE;
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}
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static void gdb_vm_stopped(void *opaque, int reason)
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{
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GDBState *s = opaque;
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char buf[256];
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int ret;
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/* disable single step if it was enable */
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cpu_single_step(cpu_single_env, 0);
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if (reason == EXCP_DEBUG)
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ret = SIGTRAP;
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else
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ret = 0;
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snprintf(buf, sizeof(buf), "S%02x", ret);
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put_packet(s, buf);
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}
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static void gdb_read_byte(GDBState *s, int ch)
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{
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int i, csum;
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char reply[1];
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if (vm_running) {
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/* when the CPU is running, we cannot do anything except stop
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it when receiving a char */
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vm_stop(EXCP_INTERRUPT);
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} else {
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switch(s->state) {
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case RS_IDLE:
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if (ch == '$') {
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s->line_buf_index = 0;
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s->state = RS_GETLINE;
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}
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break;
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case RS_GETLINE:
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if (ch == '#') {
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s->state = RS_CHKSUM1;
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} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
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s->state = RS_IDLE;
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} else {
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s->line_buf[s->line_buf_index++] = ch;
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}
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break;
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case RS_CHKSUM1:
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s->line_buf[s->line_buf_index] = '\0';
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s->line_csum = fromhex(ch) << 4;
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s->state = RS_CHKSUM2;
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break;
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case RS_CHKSUM2:
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s->line_csum |= fromhex(ch);
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csum = 0;
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for(i = 0; i < s->line_buf_index; i++) {
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csum += s->line_buf[i];
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}
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if (s->line_csum != (csum & 0xff)) {
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reply[0] = '-';
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put_buffer(s, reply, 1);
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s->state = RS_IDLE;
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} else {
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reply[0] = '+';
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put_buffer(s, reply, 1);
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s->state = gdb_handle_packet(s, s->line_buf);
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}
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break;
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}
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}
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}
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static int gdb_can_read(void *opaque)
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{
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return 256;
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}
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static void gdb_read(void *opaque, const uint8_t *buf, int size)
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{
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GDBState *s = opaque;
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int i;
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if (size == 0) {
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/* end of connection */
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qemu_del_vm_stop_handler(gdb_vm_stopped, s);
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qemu_del_fd_read_handler(s->fd);
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qemu_free(s);
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vm_start();
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} else {
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for(i = 0; i < size; i++)
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gdb_read_byte(s, buf[i]);
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}
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}
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static void gdb_accept(void *opaque, const uint8_t *buf, int size)
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{
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GDBState *s;
|
|
struct sockaddr_in sockaddr;
|
|
socklen_t len;
|
|
int val, fd;
|
|
|
|
for(;;) {
|
|
len = sizeof(sockaddr);
|
|
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
|
if (fd < 0 && errno != EINTR) {
|
|
perror("accept");
|
|
return;
|
|
} else if (fd >= 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* set short latency */
|
|
val = 1;
|
|
setsockopt(fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
|
|
|
|
s = qemu_mallocz(sizeof(GDBState));
|
|
if (!s) {
|
|
close(fd);
|
|
return;
|
|
}
|
|
s->fd = fd;
|
|
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
|
|
/* stop the VM */
|
|
vm_stop(EXCP_INTERRUPT);
|
|
|
|
/* start handling I/O */
|
|
qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s);
|
|
/* when the VM is stopped, the following callback is called */
|
|
qemu_add_vm_stop_handler(gdb_vm_stopped, s);
|
|
}
|
|
|
|
static int gdbserver_open(int port)
|
|
{
|
|
struct sockaddr_in sockaddr;
|
|
int fd, val, ret;
|
|
|
|
fd = socket(PF_INET, SOCK_STREAM, 0);
|
|
if (fd < 0) {
|
|
perror("socket");
|
|
return -1;
|
|
}
|
|
|
|
/* allow fast reuse */
|
|
val = 1;
|
|
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
|
|
|
|
sockaddr.sin_family = AF_INET;
|
|
sockaddr.sin_port = htons(port);
|
|
sockaddr.sin_addr.s_addr = 0;
|
|
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
|
|
if (ret < 0) {
|
|
perror("bind");
|
|
return -1;
|
|
}
|
|
ret = listen(fd, 0);
|
|
if (ret < 0) {
|
|
perror("listen");
|
|
return -1;
|
|
}
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
return fd;
|
|
}
|
|
|
|
int gdbserver_start(int port)
|
|
{
|
|
gdbserver_fd = gdbserver_open(port);
|
|
if (gdbserver_fd < 0)
|
|
return -1;
|
|
/* accept connections */
|
|
qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL);
|
|
return 0;
|
|
}
|