| /* |
| * gdb server stub |
| * |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include "vl.h" |
| |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <signal.h> |
| |
| //#define DEBUG_GDB |
| |
| enum RSState { |
| RS_IDLE, |
| RS_GETLINE, |
| RS_CHKSUM1, |
| RS_CHKSUM2, |
| }; |
| |
| static int gdbserver_fd; |
| |
| typedef struct GDBState { |
| enum RSState state; |
| int fd; |
| char line_buf[4096]; |
| int line_buf_index; |
| int line_csum; |
| } GDBState; |
| |
| static int get_char(GDBState *s) |
| { |
| uint8_t ch; |
| int ret; |
| |
| for(;;) { |
| ret = read(s->fd, &ch, 1); |
| if (ret < 0) { |
| if (errno != EINTR && errno != EAGAIN) |
| return -1; |
| } else if (ret == 0) { |
| return -1; |
| } else { |
| break; |
| } |
| } |
| return ch; |
| } |
| |
| static void put_buffer(GDBState *s, const uint8_t *buf, int len) |
| { |
| int ret; |
| |
| while (len > 0) { |
| ret = write(s->fd, buf, len); |
| if (ret < 0) { |
| if (errno != EINTR && errno != EAGAIN) |
| return; |
| } else { |
| buf += ret; |
| len -= ret; |
| } |
| } |
| } |
| |
| static inline int fromhex(int v) |
| { |
| if (v >= '0' && v <= '9') |
| return v - '0'; |
| else if (v >= 'A' && v <= 'F') |
| return v - 'A' + 10; |
| else if (v >= 'a' && v <= 'f') |
| return v - 'a' + 10; |
| else |
| return 0; |
| } |
| |
| static inline int tohex(int v) |
| { |
| if (v < 10) |
| return v + '0'; |
| else |
| return v - 10 + 'a'; |
| } |
| |
| static void memtohex(char *buf, const uint8_t *mem, int len) |
| { |
| int i, c; |
| char *q; |
| q = buf; |
| for(i = 0; i < len; i++) { |
| c = mem[i]; |
| *q++ = tohex(c >> 4); |
| *q++ = tohex(c & 0xf); |
| } |
| *q = '\0'; |
| } |
| |
| static void hextomem(uint8_t *mem, const char *buf, int len) |
| { |
| int i; |
| |
| for(i = 0; i < len; i++) { |
| mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
| buf += 2; |
| } |
| } |
| |
| /* return -1 if error, 0 if OK */ |
| static int put_packet(GDBState *s, char *buf) |
| { |
| char buf1[3]; |
| int len, csum, ch, i; |
| |
| #ifdef DEBUG_GDB |
| printf("reply='%s'\n", buf); |
| #endif |
| |
| for(;;) { |
| buf1[0] = '$'; |
| put_buffer(s, buf1, 1); |
| len = strlen(buf); |
| put_buffer(s, buf, len); |
| csum = 0; |
| for(i = 0; i < len; i++) { |
| csum += buf[i]; |
| } |
| buf1[0] = '#'; |
| buf1[1] = tohex((csum >> 4) & 0xf); |
| buf1[2] = tohex((csum) & 0xf); |
| |
| put_buffer(s, buf1, 3); |
| |
| ch = get_char(s); |
| if (ch < 0) |
| return -1; |
| if (ch == '+') |
| break; |
| } |
| return 0; |
| } |
| |
| #if defined(TARGET_I386) |
| |
| static void to_le32(uint8_t *p, int v) |
| { |
| p[0] = v; |
| p[1] = v >> 8; |
| p[2] = v >> 16; |
| p[3] = v >> 24; |
| } |
| |
| static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
| { |
| int i, fpus; |
| |
| for(i = 0; i < 8; i++) { |
| to_le32(mem_buf + i * 4, env->regs[i]); |
| } |
| to_le32(mem_buf + 8 * 4, env->eip); |
| to_le32(mem_buf + 9 * 4, env->eflags); |
| to_le32(mem_buf + 10 * 4, env->segs[R_CS].selector); |
| to_le32(mem_buf + 11 * 4, env->segs[R_SS].selector); |
| to_le32(mem_buf + 12 * 4, env->segs[R_DS].selector); |
| to_le32(mem_buf + 13 * 4, env->segs[R_ES].selector); |
| to_le32(mem_buf + 14 * 4, env->segs[R_FS].selector); |
| to_le32(mem_buf + 15 * 4, env->segs[R_GS].selector); |
| /* XXX: convert floats */ |
| for(i = 0; i < 8; i++) { |
| memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10); |
| } |
| to_le32(mem_buf + 36 * 4, env->fpuc); |
| fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
| to_le32(mem_buf + 37 * 4, fpus); |
| to_le32(mem_buf + 38 * 4, 0); /* XXX: convert tags */ |
| to_le32(mem_buf + 39 * 4, 0); /* fiseg */ |
| to_le32(mem_buf + 40 * 4, 0); /* fioff */ |
| to_le32(mem_buf + 41 * 4, 0); /* foseg */ |
| to_le32(mem_buf + 42 * 4, 0); /* fooff */ |
| to_le32(mem_buf + 43 * 4, 0); /* fop */ |
| return 44 * 4; |
| } |
| |
| static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
| { |
| uint32_t *registers = (uint32_t *)mem_buf; |
| int i; |
| |
| for(i = 0; i < 8; i++) { |
| env->regs[i] = tswapl(registers[i]); |
| } |
| env->eip = registers[8]; |
| env->eflags = registers[9]; |
| #if defined(CONFIG_USER_ONLY) |
| #define LOAD_SEG(index, sreg)\ |
| if (tswapl(registers[index]) != env->segs[sreg].selector)\ |
| cpu_x86_load_seg(env, sreg, tswapl(registers[index])); |
| LOAD_SEG(10, R_CS); |
| LOAD_SEG(11, R_SS); |
| LOAD_SEG(12, R_DS); |
| LOAD_SEG(13, R_ES); |
| LOAD_SEG(14, R_FS); |
| LOAD_SEG(15, R_GS); |
| #endif |
| } |
| |
| #elif defined (TARGET_PPC) |
| static void to_le32(uint8_t *p, int v) |
| { |
| p[3] = v; |
| p[2] = v >> 8; |
| p[1] = v >> 16; |
| p[0] = v >> 24; |
| } |
| |
| static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
| { |
| uint32_t tmp; |
| int i; |
| |
| /* fill in gprs */ |
| for(i = 0; i < 8; i++) { |
| to_le32(mem_buf + i * 4, env->gpr[i]); |
| } |
| /* fill in fprs */ |
| for (i = 0; i < 32; i++) { |
| to_le32(mem_buf + (i * 2) + 32, *((uint32_t *)&env->fpr[i])); |
| to_le32(mem_buf + (i * 2) + 33, *((uint32_t *)&env->fpr[i] + 1)); |
| } |
| /* nip, msr, ccr, lnk, ctr, xer, mq */ |
| to_le32(mem_buf + 96, tswapl(env->nip)); |
| to_le32(mem_buf + 97, tswapl(_load_msr())); |
| to_le32(mem_buf + 98, 0); |
| tmp = 0; |
| for (i = 0; i < 8; i++) |
| tmp |= env->crf[i] << (32 - (i * 4)); |
| to_le32(mem_buf + 98, tmp); |
| to_le32(mem_buf + 99, tswapl(env->lr)); |
| to_le32(mem_buf + 100, tswapl(env->ctr)); |
| to_le32(mem_buf + 101, tswapl(_load_xer())); |
| to_le32(mem_buf + 102, 0); |
| |
| return 102; |
| } |
| |
| static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
| { |
| uint32_t *registers = (uint32_t *)mem_buf; |
| int i; |
| |
| /* fill in gprs */ |
| for (i = 0; i < 32; i++) { |
| env->gpr[i] = tswapl(registers[i]); |
| } |
| /* fill in fprs */ |
| for (i = 0; i < 32; i++) { |
| *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]); |
| *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]); |
| } |
| /* nip, msr, ccr, lnk, ctr, xer, mq */ |
| env->nip = tswapl(registers[96]); |
| _store_msr(tswapl(registers[97])); |
| registers[98] = tswapl(registers[98]); |
| for (i = 0; i < 8; i++) |
| env->crf[i] = (registers[98] >> (32 - (i * 4))) & 0xF; |
| env->lr = tswapl(registers[99]); |
| env->ctr = tswapl(registers[100]); |
| _store_xer(tswapl(registers[101])); |
| } |
| #else |
| |
| static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
| { |
| return 0; |
| } |
| |
| static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
| { |
| } |
| |
| #endif |
| |
| /* port = 0 means default port */ |
| static int gdb_handle_packet(GDBState *s, const char *line_buf) |
| { |
| CPUState *env = cpu_single_env; |
| const char *p; |
| int ch, reg_size, type; |
| char buf[4096]; |
| uint8_t mem_buf[2000]; |
| uint32_t *registers; |
| uint32_t addr, len; |
| |
| #ifdef DEBUG_GDB |
| printf("command='%s'\n", line_buf); |
| #endif |
| p = line_buf; |
| ch = *p++; |
| switch(ch) { |
| case '?': |
| snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
| put_packet(s, buf); |
| break; |
| case 'c': |
| if (*p != '\0') { |
| addr = strtoul(p, (char **)&p, 16); |
| #if defined(TARGET_I386) |
| env->eip = addr; |
| #elif defined (TARGET_PPC) |
| env->nip = addr; |
| #endif |
| } |
| vm_start(); |
| break; |
| case 's': |
| if (*p != '\0') { |
| addr = strtoul(p, (char **)&p, 16); |
| #if defined(TARGET_I386) |
| env->eip = addr; |
| #elif defined (TARGET_PPC) |
| env->nip = addr; |
| #endif |
| } |
| cpu_single_step(env, 1); |
| vm_start(); |
| break; |
| case 'g': |
| reg_size = cpu_gdb_read_registers(env, mem_buf); |
| memtohex(buf, mem_buf, reg_size); |
| put_packet(s, buf); |
| break; |
| case 'G': |
| registers = (void *)mem_buf; |
| len = strlen(p) / 2; |
| hextomem((uint8_t *)registers, p, len); |
| cpu_gdb_write_registers(env, mem_buf, len); |
| put_packet(s, "OK"); |
| break; |
| case 'm': |
| addr = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoul(p, NULL, 16); |
| if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) |
| memset(mem_buf, 0, len); |
| memtohex(buf, mem_buf, len); |
| put_packet(s, buf); |
| break; |
| case 'M': |
| addr = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| hextomem(mem_buf, p, len); |
| if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) |
| put_packet(s, "ENN"); |
| else |
| put_packet(s, "OK"); |
| break; |
| case 'Z': |
| type = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| addr = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoul(p, (char **)&p, 16); |
| if (type == 0 || type == 1) { |
| if (cpu_breakpoint_insert(env, addr) < 0) |
| goto breakpoint_error; |
| put_packet(s, "OK"); |
| } else { |
| breakpoint_error: |
| put_packet(s, "ENN"); |
| } |
| break; |
| case 'z': |
| type = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| addr = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoul(p, (char **)&p, 16); |
| if (type == 0 || type == 1) { |
| cpu_breakpoint_remove(env, addr); |
| put_packet(s, "OK"); |
| } else { |
| goto breakpoint_error; |
| } |
| break; |
| default: |
| // unknown_command: |
| /* put empty packet */ |
| buf[0] = '\0'; |
| put_packet(s, buf); |
| break; |
| } |
| return RS_IDLE; |
| } |
| |
| static void gdb_vm_stopped(void *opaque, int reason) |
| { |
| GDBState *s = opaque; |
| char buf[256]; |
| int ret; |
| |
| /* disable single step if it was enable */ |
| cpu_single_step(cpu_single_env, 0); |
| |
| if (reason == EXCP_DEBUG) |
| ret = SIGTRAP; |
| else |
| ret = 0; |
| snprintf(buf, sizeof(buf), "S%02x", ret); |
| put_packet(s, buf); |
| } |
| |
| static void gdb_read_byte(GDBState *s, int ch) |
| { |
| int i, csum; |
| char reply[1]; |
| |
| if (vm_running) { |
| /* when the CPU is running, we cannot do anything except stop |
| it when receiving a char */ |
| vm_stop(EXCP_INTERRUPT); |
| } else { |
| switch(s->state) { |
| case RS_IDLE: |
| if (ch == '$') { |
| s->line_buf_index = 0; |
| s->state = RS_GETLINE; |
| } |
| break; |
| case RS_GETLINE: |
| if (ch == '#') { |
| s->state = RS_CHKSUM1; |
| } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
| s->state = RS_IDLE; |
| } else { |
| s->line_buf[s->line_buf_index++] = ch; |
| } |
| break; |
| case RS_CHKSUM1: |
| s->line_buf[s->line_buf_index] = '\0'; |
| s->line_csum = fromhex(ch) << 4; |
| s->state = RS_CHKSUM2; |
| break; |
| case RS_CHKSUM2: |
| s->line_csum |= fromhex(ch); |
| csum = 0; |
| for(i = 0; i < s->line_buf_index; i++) { |
| csum += s->line_buf[i]; |
| } |
| if (s->line_csum != (csum & 0xff)) { |
| reply[0] = '-'; |
| put_buffer(s, reply, 1); |
| s->state = RS_IDLE; |
| } else { |
| reply[0] = '+'; |
| put_buffer(s, reply, 1); |
| s->state = gdb_handle_packet(s, s->line_buf); |
| } |
| break; |
| } |
| } |
| } |
| |
| static int gdb_can_read(void *opaque) |
| { |
| return 256; |
| } |
| |
| static void gdb_read(void *opaque, const uint8_t *buf, int size) |
| { |
| GDBState *s = opaque; |
| int i; |
| if (size == 0) { |
| /* end of connection */ |
| qemu_del_vm_stop_handler(gdb_vm_stopped, s); |
| qemu_del_fd_read_handler(s->fd); |
| qemu_free(s); |
| vm_start(); |
| } else { |
| for(i = 0; i < size; i++) |
| gdb_read_byte(s, buf[i]); |
| } |
| } |
| |
| static void gdb_accept(void *opaque, const uint8_t *buf, int size) |
| { |
| 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; |
| } |
