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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 "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 int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf; |
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int i, fpus;
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for(i = 0; i < 8; i++) { |
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registers[i] = 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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/* 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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registers[36] = env->fpuc;
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fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
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registers[37] = fpus;
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registers[38] = 0; /* XXX: convert tags */ |
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registers[39] = 0; /* fiseg */ |
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registers[40] = 0; /* fioff */ |
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registers[41] = 0; /* foseg */ |
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registers[42] = 0; /* fooff */ |
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registers[43] = 0; /* fop */ |
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for(i = 0; i < 16; i++) |
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tswapls(®isters[i]); |
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for(i = 36; i < 44; i++) |
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tswapls(®isters[i]); |
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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 = tswapl(registers[8]);
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env->eflags = tswapl(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 int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf, tmp; |
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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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registers[i] = tswapl(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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registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i])); |
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registers[(i * 2) + 33] = tswapl(*((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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registers[96] = tswapl(env->nip);
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registers[97] = tswapl(_load_msr(env));
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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 + 1) * 4)); |
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registers[98] = tswapl(tmp);
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registers[99] = tswapl(env->lr);
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registers[100] = tswapl(env->ctr);
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registers[101] = tswapl(_load_xer(env));
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registers[102] = 0; |
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return 103 * 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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/* 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(env, 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 + 1) * 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(env, tswapl(registers[101]));
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} |
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#elif defined (TARGET_SPARC)
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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 *registers = (uint32_t *)mem_buf, tmp; |
278 |
int i;
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/* fill in g0..g7 */
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for(i = 0; i < 7; i++) { |
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registers[i] = tswapl(env->gregs[i]); |
283 |
} |
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/* fill in register window */
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for(i = 0; i < 24; i++) { |
286 |
registers[i + 8] = tswapl(env->regwptr[i]);
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} |
288 |
/* fill in fprs */
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for (i = 0; i < 32; i++) { |
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registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
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} |
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/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
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registers[64] = tswapl(env->y);
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tmp = GET_PSR(env); |
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registers[65] = tswapl(tmp);
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registers[66] = tswapl(env->wim);
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registers[67] = tswapl(env->tbr);
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registers[68] = tswapl(env->pc);
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registers[69] = tswapl(env->npc);
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registers[70] = tswapl(env->fsr);
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registers[71] = 0; /* csr */ |
302 |
registers[72] = 0; |
303 |
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return 73 * 4; |
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} |
306 |
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307 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
308 |
{ |
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uint32_t *registers = (uint32_t *)mem_buf; |
310 |
int i;
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311 |
|
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/* fill in g0..g7 */
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for(i = 0; i < 7; i++) { |
314 |
env->gregs[i] = tswapl(registers[i]); |
315 |
} |
316 |
/* fill in register window */
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317 |
for(i = 0; i < 24; i++) { |
318 |
env->regwptr[i] = tswapl(registers[i]); |
319 |
} |
320 |
/* fill in fprs */
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321 |
for (i = 0; i < 32; i++) { |
322 |
*((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
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323 |
} |
324 |
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
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325 |
env->y = tswapl(registers[64]);
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326 |
PUT_PSR(env, tswapl(registers[65]));
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327 |
env->wim = tswapl(registers[66]);
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328 |
env->tbr = tswapl(registers[67]);
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329 |
env->pc = tswapl(registers[68]);
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330 |
env->npc = tswapl(registers[69]);
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331 |
env->fsr = tswapl(registers[70]);
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332 |
} |
333 |
#else
|
334 |
|
335 |
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
336 |
{ |
337 |
return 0; |
338 |
} |
339 |
|
340 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
341 |
{ |
342 |
} |
343 |
|
344 |
#endif
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345 |
|
346 |
/* port = 0 means default port */
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347 |
static int gdb_handle_packet(GDBState *s, const char *line_buf) |
348 |
{ |
349 |
CPUState *env = cpu_single_env; |
350 |
const char *p; |
351 |
int ch, reg_size, type;
|
352 |
char buf[4096]; |
353 |
uint8_t mem_buf[2000];
|
354 |
uint32_t *registers; |
355 |
uint32_t addr, len; |
356 |
|
357 |
#ifdef DEBUG_GDB
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358 |
printf("command='%s'\n", line_buf);
|
359 |
#endif
|
360 |
p = line_buf; |
361 |
ch = *p++; |
362 |
switch(ch) {
|
363 |
case '?': |
364 |
snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
365 |
put_packet(s, buf); |
366 |
break;
|
367 |
case 'c': |
368 |
if (*p != '\0') { |
369 |
addr = strtoul(p, (char **)&p, 16); |
370 |
#if defined(TARGET_I386)
|
371 |
env->eip = addr; |
372 |
#elif defined (TARGET_PPC)
|
373 |
env->nip = addr; |
374 |
#elif defined (TARGET_SPARC)
|
375 |
env->pc = addr; |
376 |
env->npc = addr + 4;
|
377 |
#endif
|
378 |
} |
379 |
vm_start(); |
380 |
break;
|
381 |
case 's': |
382 |
if (*p != '\0') { |
383 |
addr = strtoul(p, (char **)&p, 16); |
384 |
#if defined(TARGET_I386)
|
385 |
env->eip = addr; |
386 |
#elif defined (TARGET_PPC)
|
387 |
env->nip = addr; |
388 |
#elif defined (TARGET_SPARC)
|
389 |
env->pc = addr; |
390 |
env->npc = addr + 4;
|
391 |
#endif
|
392 |
} |
393 |
cpu_single_step(env, 1);
|
394 |
vm_start(); |
395 |
break;
|
396 |
case 'g': |
397 |
reg_size = cpu_gdb_read_registers(env, mem_buf); |
398 |
memtohex(buf, mem_buf, reg_size); |
399 |
put_packet(s, buf); |
400 |
break;
|
401 |
case 'G': |
402 |
registers = (void *)mem_buf;
|
403 |
len = strlen(p) / 2;
|
404 |
hextomem((uint8_t *)registers, p, len); |
405 |
cpu_gdb_write_registers(env, mem_buf, len); |
406 |
put_packet(s, "OK");
|
407 |
break;
|
408 |
case 'm': |
409 |
addr = strtoul(p, (char **)&p, 16); |
410 |
if (*p == ',') |
411 |
p++; |
412 |
len = strtoul(p, NULL, 16); |
413 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) |
414 |
memset(mem_buf, 0, len);
|
415 |
memtohex(buf, mem_buf, len); |
416 |
put_packet(s, buf); |
417 |
break;
|
418 |
case 'M': |
419 |
addr = strtoul(p, (char **)&p, 16); |
420 |
if (*p == ',') |
421 |
p++; |
422 |
len = strtoul(p, (char **)&p, 16); |
423 |
if (*p == ',') |
424 |
p++; |
425 |
hextomem(mem_buf, p, len); |
426 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) |
427 |
put_packet(s, "ENN");
|
428 |
else
|
429 |
put_packet(s, "OK");
|
430 |
break;
|
431 |
case 'Z': |
432 |
type = strtoul(p, (char **)&p, 16); |
433 |
if (*p == ',') |
434 |
p++; |
435 |
addr = strtoul(p, (char **)&p, 16); |
436 |
if (*p == ',') |
437 |
p++; |
438 |
len = strtoul(p, (char **)&p, 16); |
439 |
if (type == 0 || type == 1) { |
440 |
if (cpu_breakpoint_insert(env, addr) < 0) |
441 |
goto breakpoint_error;
|
442 |
put_packet(s, "OK");
|
443 |
} else {
|
444 |
breakpoint_error:
|
445 |
put_packet(s, "ENN");
|
446 |
} |
447 |
break;
|
448 |
case 'z': |
449 |
type = strtoul(p, (char **)&p, 16); |
450 |
if (*p == ',') |
451 |
p++; |
452 |
addr = strtoul(p, (char **)&p, 16); |
453 |
if (*p == ',') |
454 |
p++; |
455 |
len = strtoul(p, (char **)&p, 16); |
456 |
if (type == 0 || type == 1) { |
457 |
cpu_breakpoint_remove(env, addr); |
458 |
put_packet(s, "OK");
|
459 |
} else {
|
460 |
goto breakpoint_error;
|
461 |
} |
462 |
break;
|
463 |
default:
|
464 |
// unknown_command:
|
465 |
/* put empty packet */
|
466 |
buf[0] = '\0'; |
467 |
put_packet(s, buf); |
468 |
break;
|
469 |
} |
470 |
return RS_IDLE;
|
471 |
} |
472 |
|
473 |
extern void tb_flush(CPUState *env); |
474 |
|
475 |
static void gdb_vm_stopped(void *opaque, int reason) |
476 |
{ |
477 |
GDBState *s = opaque; |
478 |
char buf[256]; |
479 |
int ret;
|
480 |
|
481 |
/* disable single step if it was enable */
|
482 |
cpu_single_step(cpu_single_env, 0);
|
483 |
|
484 |
if (reason == EXCP_DEBUG) {
|
485 |
tb_flush(cpu_single_env); |
486 |
ret = SIGTRAP; |
487 |
} |
488 |
else
|
489 |
ret = 0;
|
490 |
snprintf(buf, sizeof(buf), "S%02x", ret); |
491 |
put_packet(s, buf); |
492 |
} |
493 |
|
494 |
static void gdb_read_byte(GDBState *s, int ch) |
495 |
{ |
496 |
int i, csum;
|
497 |
char reply[1]; |
498 |
|
499 |
if (vm_running) {
|
500 |
/* when the CPU is running, we cannot do anything except stop
|
501 |
it when receiving a char */
|
502 |
vm_stop(EXCP_INTERRUPT); |
503 |
} else {
|
504 |
switch(s->state) {
|
505 |
case RS_IDLE:
|
506 |
if (ch == '$') { |
507 |
s->line_buf_index = 0;
|
508 |
s->state = RS_GETLINE; |
509 |
} |
510 |
break;
|
511 |
case RS_GETLINE:
|
512 |
if (ch == '#') { |
513 |
s->state = RS_CHKSUM1; |
514 |
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
515 |
s->state = RS_IDLE; |
516 |
} else {
|
517 |
s->line_buf[s->line_buf_index++] = ch; |
518 |
} |
519 |
break;
|
520 |
case RS_CHKSUM1:
|
521 |
s->line_buf[s->line_buf_index] = '\0';
|
522 |
s->line_csum = fromhex(ch) << 4;
|
523 |
s->state = RS_CHKSUM2; |
524 |
break;
|
525 |
case RS_CHKSUM2:
|
526 |
s->line_csum |= fromhex(ch); |
527 |
csum = 0;
|
528 |
for(i = 0; i < s->line_buf_index; i++) { |
529 |
csum += s->line_buf[i]; |
530 |
} |
531 |
if (s->line_csum != (csum & 0xff)) { |
532 |
reply[0] = '-'; |
533 |
put_buffer(s, reply, 1);
|
534 |
s->state = RS_IDLE; |
535 |
} else {
|
536 |
reply[0] = '+'; |
537 |
put_buffer(s, reply, 1);
|
538 |
s->state = gdb_handle_packet(s, s->line_buf); |
539 |
} |
540 |
break;
|
541 |
} |
542 |
} |
543 |
} |
544 |
|
545 |
static int gdb_can_read(void *opaque) |
546 |
{ |
547 |
return 256; |
548 |
} |
549 |
|
550 |
static void gdb_read(void *opaque, const uint8_t *buf, int size) |
551 |
{ |
552 |
GDBState *s = opaque; |
553 |
int i;
|
554 |
if (size == 0) { |
555 |
/* end of connection */
|
556 |
qemu_del_vm_stop_handler(gdb_vm_stopped, s); |
557 |
qemu_del_fd_read_handler(s->fd); |
558 |
qemu_free(s); |
559 |
vm_start(); |
560 |
} else {
|
561 |
for(i = 0; i < size; i++) |
562 |
gdb_read_byte(s, buf[i]); |
563 |
} |
564 |
} |
565 |
|
566 |
static void gdb_accept(void *opaque, const uint8_t *buf, int size) |
567 |
{ |
568 |
GDBState *s; |
569 |
struct sockaddr_in sockaddr;
|
570 |
socklen_t len; |
571 |
int val, fd;
|
572 |
|
573 |
for(;;) {
|
574 |
len = sizeof(sockaddr);
|
575 |
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
576 |
if (fd < 0 && errno != EINTR) { |
577 |
perror("accept");
|
578 |
return;
|
579 |
} else if (fd >= 0) { |
580 |
break;
|
581 |
} |
582 |
} |
583 |
|
584 |
/* set short latency */
|
585 |
val = 1;
|
586 |
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
|
587 |
|
588 |
s = qemu_mallocz(sizeof(GDBState));
|
589 |
if (!s) {
|
590 |
close(fd); |
591 |
return;
|
592 |
} |
593 |
s->fd = fd; |
594 |
|
595 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
596 |
|
597 |
/* stop the VM */
|
598 |
vm_stop(EXCP_INTERRUPT); |
599 |
|
600 |
/* start handling I/O */
|
601 |
qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s); |
602 |
/* when the VM is stopped, the following callback is called */
|
603 |
qemu_add_vm_stop_handler(gdb_vm_stopped, s); |
604 |
} |
605 |
|
606 |
static int gdbserver_open(int port) |
607 |
{ |
608 |
struct sockaddr_in sockaddr;
|
609 |
int fd, val, ret;
|
610 |
|
611 |
fd = socket(PF_INET, SOCK_STREAM, 0);
|
612 |
if (fd < 0) { |
613 |
perror("socket");
|
614 |
return -1; |
615 |
} |
616 |
|
617 |
/* allow fast reuse */
|
618 |
val = 1;
|
619 |
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
|
620 |
|
621 |
sockaddr.sin_family = AF_INET; |
622 |
sockaddr.sin_port = htons(port); |
623 |
sockaddr.sin_addr.s_addr = 0;
|
624 |
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
625 |
if (ret < 0) { |
626 |
perror("bind");
|
627 |
return -1; |
628 |
} |
629 |
ret = listen(fd, 0);
|
630 |
if (ret < 0) { |
631 |
perror("listen");
|
632 |
return -1; |
633 |
} |
634 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
635 |
return fd;
|
636 |
} |
637 |
|
638 |
int gdbserver_start(int port) |
639 |
{ |
640 |
gdbserver_fd = gdbserver_open(port); |
641 |
if (gdbserver_fd < 0) |
642 |
return -1; |
643 |
/* accept connections */
|
644 |
qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL); |
645 |
return 0; |
646 |
} |