/*************************************************************************** * Copyright (C) 2005 by Dominic Rath * * Dominic.Rath@gmx.de * * * * Copyright (C) 2007-2010 Øyvind Harboe * * oyvind.harboe@zylin.com * * * * Copyright (C) 2008 by Spencer Oliver * * spen@spen-soft.co.uk * * * * Copyright (C) 2011 by Broadcom Corporation * * Evan Hunter - ehunter@broadcom.com * * * * Copyright (C) ST-Ericsson SA 2011 * * michel.jaouen@stericsson.com : smp minimum support * * * * Copyright (C) 2013 Andes Technology * * Hsiangkai Wang * * * * Copyright (C) 2013 Franck Jullien * * elec4fun@gmail.com * * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * * This program 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 General Public License for more details. * * * * You should have received a copy of the GNU General Public License * * along with this program. If not, see . * ***************************************************************************/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include "server.h" #include #include "gdb_server.h" #include #include #include "rtos/rtos.h" #include "target/smp.h" /** * @file * GDB server implementation. * * This implements the GDB Remote Serial Protocol, over TCP connections, * giving GDB access to the JTAG or other hardware debugging facilities * found in most modern embedded processors. */ struct target_desc_format { char *tdesc; uint32_t tdesc_length; }; /* private connection data for GDB */ struct gdb_connection { char buffer[GDB_BUFFER_SIZE]; char *buf_p; int buf_cnt; int ctrl_c; enum target_state frontend_state; struct image *vflash_image; bool closed; bool busy; int noack_mode; /* set flag to true if you want the next stepi to return immediately. * allowing GDB to pick up a fresh set of register values from the target * without modifying the target state. */ bool sync; /* We delay reporting memory write errors until next step/continue or memory * write. This improves performance of gdb load significantly as the GDB packet * can be replied immediately and a new GDB packet will be ready without delay * (ca. 10% or so...). */ bool mem_write_error; /* with extended-remote it seems we need to better emulate attach/detach. * what this means is we reply with a W stop reply after a kill packet, * normally we reply with a S reply via gdb_last_signal_packet. * as a side note this behaviour only effects gdb > 6.8 */ bool attached; /* temporarily used for target description support */ struct target_desc_format target_desc; /* temporarily used for thread list support */ char *thread_list; }; #if 0 #define _DEBUG_GDB_IO_ #endif static struct gdb_connection *current_gdb_connection; static int gdb_breakpoint_override; static enum breakpoint_type gdb_breakpoint_override_type; static int gdb_error(struct connection *connection, int retval); static char *gdb_port; static char *gdb_port_next; static void gdb_log_callback(void *priv, const char *file, unsigned line, const char *function, const char *string); static void gdb_sig_halted(struct connection *connection); /* number of gdb connections, mainly to suppress gdb related debugging spam * in helper/log.c when no gdb connections are actually active */ int gdb_actual_connections; /* set if we are sending a memory map to gdb * via qXfer:memory-map:read packet */ /* enabled by default*/ static int gdb_use_memory_map = 1; /* enabled by default*/ static int gdb_flash_program = 1; /* if set, data aborts cause an error to be reported in memory read packets * see the code in gdb_read_memory_packet() for further explanations. * Disabled by default. */ static int gdb_report_data_abort; /* If set, errors when accessing registers are reported to gdb. Disabled by * default. */ static int gdb_report_register_access_error; /* set if we are sending target descriptions to gdb * via qXfer:features:read packet */ /* enabled by default */ static int gdb_use_target_description = 1; /* current processing free-run type, used by file-I/O */ static char gdb_running_type; static int gdb_last_signal(struct target *target) { switch (target->debug_reason) { case DBG_REASON_DBGRQ: return 0x2; /* SIGINT */ case DBG_REASON_BREAKPOINT: case DBG_REASON_WATCHPOINT: case DBG_REASON_WPTANDBKPT: return 0x05; /* SIGTRAP */ case DBG_REASON_SINGLESTEP: return 0x05; /* SIGTRAP */ case DBG_REASON_NOTHALTED: return 0x0; /* no signal... shouldn't happen */ default: LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason); return 0x0; } } static int check_pending(struct connection *connection, int timeout_s, int *got_data) { /* a non-blocking socket will block if there is 0 bytes available on the socket, * but return with as many bytes as are available immediately */ struct timeval tv; fd_set read_fds; struct gdb_connection *gdb_con = connection->priv; int t; if (got_data == NULL) got_data = &t; *got_data = 0; if (gdb_con->buf_cnt > 0) { *got_data = 1; return ERROR_OK; } FD_ZERO(&read_fds); FD_SET(connection->fd, &read_fds); tv.tv_sec = timeout_s; tv.tv_usec = 0; if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0) { /* This can typically be because a "monitor" command took too long * before printing any progress messages */ if (timeout_s > 0) return ERROR_GDB_TIMEOUT; else return ERROR_OK; } *got_data = FD_ISSET(connection->fd, &read_fds) != 0; return ERROR_OK; } static int gdb_get_char_inner(struct connection *connection, int *next_char) { struct gdb_connection *gdb_con = connection->priv; int retval = ERROR_OK; #ifdef _DEBUG_GDB_IO_ char *debug_buffer; #endif for (;; ) { if (connection->service->type != CONNECTION_TCP) gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE); else { retval = check_pending(connection, 1, NULL); if (retval != ERROR_OK) return retval; gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE); } if (gdb_con->buf_cnt > 0) break; if (gdb_con->buf_cnt == 0) { gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; } #ifdef _WIN32 errno = WSAGetLastError(); switch (errno) { case WSAEWOULDBLOCK: usleep(1000); break; case WSAECONNABORTED: gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; case WSAECONNRESET: gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; default: LOG_ERROR("read: %d", errno); exit(-1); } #else switch (errno) { case EAGAIN: usleep(1000); break; case ECONNABORTED: gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; case ECONNRESET: gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; default: LOG_ERROR("read: %s", strerror(errno)); gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; } #endif } #ifdef _DEBUG_GDB_IO_ debug_buffer = strndup(gdb_con->buffer, gdb_con->buf_cnt); LOG_DEBUG("received '%s'", debug_buffer); free(debug_buffer); #endif gdb_con->buf_p = gdb_con->buffer; gdb_con->buf_cnt--; *next_char = *(gdb_con->buf_p++); if (gdb_con->buf_cnt > 0) connection->input_pending = 1; else connection->input_pending = 0; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char); #endif return retval; } /** * The cool thing about this fn is that it allows buf_p and buf_cnt to be * held in registers in the inner loop. * * For small caches and embedded systems this is important! */ static inline int gdb_get_char_fast(struct connection *connection, int *next_char, char **buf_p, int *buf_cnt) { int retval = ERROR_OK; if ((*buf_cnt)-- > 0) { *next_char = **buf_p; (*buf_p)++; if (*buf_cnt > 0) connection->input_pending = 1; else connection->input_pending = 0; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char); #endif return ERROR_OK; } struct gdb_connection *gdb_con = connection->priv; gdb_con->buf_p = *buf_p; gdb_con->buf_cnt = *buf_cnt; retval = gdb_get_char_inner(connection, next_char); *buf_p = gdb_con->buf_p; *buf_cnt = gdb_con->buf_cnt; return retval; } static int gdb_get_char(struct connection *connection, int *next_char) { struct gdb_connection *gdb_con = connection->priv; return gdb_get_char_fast(connection, next_char, &gdb_con->buf_p, &gdb_con->buf_cnt); } static int gdb_putback_char(struct connection *connection, int last_char) { struct gdb_connection *gdb_con = connection->priv; if (gdb_con->buf_p > gdb_con->buffer) { *(--gdb_con->buf_p) = last_char; gdb_con->buf_cnt++; } else LOG_ERROR("BUG: couldn't put character back"); return ERROR_OK; } /* The only way we can detect that the socket is closed is the first time * we write to it, we will fail. Subsequent write operations will * succeed. Shudder! */ static int gdb_write(struct connection *connection, void *data, int len) { struct gdb_connection *gdb_con = connection->priv; if (gdb_con->closed) return ERROR_SERVER_REMOTE_CLOSED; if (connection_write(connection, data, len) == len) return ERROR_OK; gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; } static int gdb_put_packet_inner(struct connection *connection, char *buffer, int len) { int i; unsigned char my_checksum = 0; #ifdef _DEBUG_GDB_IO_ char *debug_buffer; #endif int reply; int retval; struct gdb_connection *gdb_con = connection->priv; for (i = 0; i < len; i++) my_checksum += buffer[i]; #ifdef _DEBUG_GDB_IO_ /* * At this point we should have nothing in the input queue from GDB, * however sometimes '-' is sent even though we've already received * an ACK (+) for everything we've sent off. */ int gotdata; for (;; ) { retval = check_pending(connection, 0, &gotdata); if (retval != ERROR_OK) return retval; if (!gotdata) break; retval = gdb_get_char(connection, &reply); if (retval != ERROR_OK) return retval; if (reply == '$') { /* fix a problem with some IAR tools */ gdb_putback_char(connection, reply); LOG_DEBUG("Unexpected start of new packet"); break; } LOG_WARNING("Discard unexpected char %c", reply); } #endif while (1) { #ifdef _DEBUG_GDB_IO_ debug_buffer = strndup(buffer, len); LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum); free(debug_buffer); #endif char local_buffer[1024]; local_buffer[0] = '$'; if ((size_t)len + 4 <= sizeof(local_buffer)) { /* performance gain on smaller packets by only a single call to gdb_write() */ memcpy(local_buffer + 1, buffer, len++); len += snprintf(local_buffer + len, sizeof(local_buffer) - len, "#%02x", my_checksum); retval = gdb_write(connection, local_buffer, len); if (retval != ERROR_OK) return retval; } else { /* larger packets are transmitted directly from caller supplied buffer * by several calls to gdb_write() to avoid dynamic allocation */ snprintf(local_buffer + 1, sizeof(local_buffer) - 1, "#%02x", my_checksum); retval = gdb_write(connection, local_buffer, 1); if (retval != ERROR_OK) return retval; retval = gdb_write(connection, buffer, len); if (retval != ERROR_OK) return retval; retval = gdb_write(connection, local_buffer + 1, 3); if (retval != ERROR_OK) return retval; } if (gdb_con->noack_mode) break; retval = gdb_get_char(connection, &reply); if (retval != ERROR_OK) return retval; if (reply == '+') break; else if (reply == '-') { /* Stop sending output packets for now */ log_remove_callback(gdb_log_callback, connection); LOG_WARNING("negative reply, retrying"); } else if (reply == 0x3) { gdb_con->ctrl_c = 1; retval = gdb_get_char(connection, &reply); if (retval != ERROR_OK) return retval; if (reply == '+') break; else if (reply == '-') { /* Stop sending output packets for now */ log_remove_callback(gdb_log_callback, connection); LOG_WARNING("negative reply, retrying"); } else if (reply == '$') { LOG_ERROR("GDB missing ack(1) - assumed good"); gdb_putback_char(connection, reply); return ERROR_OK; } else { LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply); gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; } } else if (reply == '$') { LOG_ERROR("GDB missing ack(2) - assumed good"); gdb_putback_char(connection, reply); return ERROR_OK; } else { LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply); gdb_con->closed = true; return ERROR_SERVER_REMOTE_CLOSED; } } if (gdb_con->closed) return ERROR_SERVER_REMOTE_CLOSED; return ERROR_OK; } int gdb_put_packet(struct connection *connection, char *buffer, int len) { struct gdb_connection *gdb_con = connection->priv; gdb_con->busy = true; int retval = gdb_put_packet_inner(connection, buffer, len); gdb_con->busy = false; /* we sent some data, reset timer for keep alive messages */ kept_alive(); return retval; } static inline int fetch_packet(struct connection *connection, int *checksum_ok, int noack, int *len, char *buffer) { unsigned char my_checksum = 0; char checksum[3]; int character; int retval = ERROR_OK; struct gdb_connection *gdb_con = connection->priv; my_checksum = 0; int count = 0; count = 0; /* move this over into local variables to use registers and give the * more freedom to optimize */ char *buf_p = gdb_con->buf_p; int buf_cnt = gdb_con->buf_cnt; for (;; ) { /* The common case is that we have an entire packet with no escape chars. * We need to leave at least 2 bytes in the buffer to have * gdb_get_char() update various bits and bobs correctly. */ if ((buf_cnt > 2) && ((buf_cnt + count) < *len)) { /* The compiler will struggle a bit with constant propagation and * aliasing, so we help it by showing that these values do not * change inside the loop */ int i; char *buf = buf_p; int run = buf_cnt - 2; i = 0; int done = 0; while (i < run) { character = *buf++; i++; if (character == '#') { /* Danger! character can be '#' when esc is * used so we need an explicit boolean for done here. */ done = 1; break; } if (character == '}') { /* data transmitted in binary mode (X packet) * uses 0x7d as escape character */ my_checksum += character & 0xff; character = *buf++; i++; my_checksum += character & 0xff; buffer[count++] = (character ^ 0x20) & 0xff; } else { my_checksum += character & 0xff; buffer[count++] = character & 0xff; } } buf_p += i; buf_cnt -= i; if (done) break; } if (count > *len) { LOG_ERROR("packet buffer too small"); retval = ERROR_GDB_BUFFER_TOO_SMALL; break; } retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt); if (retval != ERROR_OK) break; if (character == '#') break; if (character == '}') { /* data transmitted in binary mode (X packet) * uses 0x7d as escape character */ my_checksum += character & 0xff; retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt); if (retval != ERROR_OK) break; my_checksum += character & 0xff; buffer[count++] = (character ^ 0x20) & 0xff; } else { my_checksum += character & 0xff; buffer[count++] = character & 0xff; } } gdb_con->buf_p = buf_p; gdb_con->buf_cnt = buf_cnt; if (retval != ERROR_OK) return retval; *len = count; retval = gdb_get_char(connection, &character); if (retval != ERROR_OK) return retval; checksum[0] = character; retval = gdb_get_char(connection, &character); if (retval != ERROR_OK) return retval; checksum[1] = character; checksum[2] = 0; if (!noack) *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16)); return ERROR_OK; } static int gdb_get_packet_inner(struct connection *connection, char *buffer, int *len) { int character; int retval; struct gdb_connection *gdb_con = connection->priv; while (1) { do { retval = gdb_get_char(connection, &character); if (retval != ERROR_OK) return retval; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("character: '%c'", character); #endif switch (character) { case '$': break; case '+': /* According to the GDB documentation * (https://sourceware.org/gdb/onlinedocs/gdb/Packet-Acknowledgment.html): * "gdb sends a final `+` acknowledgment of the stub's `OK` * response, which can be safely ignored by the stub." * However OpenOCD server already is in noack mode at this * point and instead of ignoring this it was emitting a * warning. This code makes server ignore the first ACK * that will be received after going into noack mode, * warning only about subsequent ACK's. */ if (gdb_con->noack_mode > 1) { LOG_WARNING("acknowledgment received, but no packet pending"); } else if (gdb_con->noack_mode) { LOG_DEBUG("Received first acknowledgment after entering noack mode. Ignoring it."); gdb_con->noack_mode = 2; } break; case '-': LOG_WARNING("negative acknowledgment, but no packet pending"); break; case 0x3: gdb_con->ctrl_c = 1; *len = 0; return ERROR_OK; default: LOG_WARNING("ignoring character 0x%x", character); break; } } while (character != '$'); int checksum_ok = 0; /* explicit code expansion here to get faster inlined code in -O3 by not * calculating checksum */ if (gdb_con->noack_mode) { retval = fetch_packet(connection, &checksum_ok, 1, len, buffer); if (retval != ERROR_OK) return retval; } else { retval = fetch_packet(connection, &checksum_ok, 0, len, buffer); if (retval != ERROR_OK) return retval; } if (gdb_con->noack_mode) { /* checksum is not checked in noack mode */ break; } if (checksum_ok) { retval = gdb_write(connection, "+", 1); if (retval != ERROR_OK) return retval; break; } } if (gdb_con->closed) return ERROR_SERVER_REMOTE_CLOSED; return ERROR_OK; } static int gdb_get_packet(struct connection *connection, char *buffer, int *len) { struct gdb_connection *gdb_con = connection->priv; gdb_con->busy = true; int retval = gdb_get_packet_inner(connection, buffer, len); gdb_con->busy = false; return retval; } static int gdb_output_con(struct connection *connection, const char *line) { char *hex_buffer; int bin_size; bin_size = strlen(line); hex_buffer = malloc(bin_size * 2 + 2); if (hex_buffer == NULL) return ERROR_GDB_BUFFER_TOO_SMALL; hex_buffer[0] = 'O'; size_t pkt_len = hexify(hex_buffer + 1, (const uint8_t *)line, bin_size, bin_size * 2 + 1); int retval = gdb_put_packet(connection, hex_buffer, pkt_len + 1); free(hex_buffer); return retval; } static int gdb_output(struct command_context *context, const char *line) { /* this will be dumped to the log and also sent as an O packet if possible */ LOG_USER_N("%s", line); return ERROR_OK; } static void gdb_signal_reply(struct target *target, struct connection *connection) { struct gdb_connection *gdb_connection = connection->priv; char sig_reply[45]; char stop_reason[20]; char current_thread[25]; int sig_reply_len; int signal_var; rtos_update_threads(target); if (target->debug_reason == DBG_REASON_EXIT) { sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "W00"); } else { if (gdb_connection->ctrl_c) { signal_var = 0x2; } else signal_var = gdb_last_signal(target); stop_reason[0] = '\0'; if (target->debug_reason == DBG_REASON_WATCHPOINT) { enum watchpoint_rw hit_wp_type; target_addr_t hit_wp_address; if (watchpoint_hit(target, &hit_wp_type, &hit_wp_address) == ERROR_OK) { switch (hit_wp_type) { case WPT_WRITE: snprintf(stop_reason, sizeof(stop_reason), "watch:%08" TARGET_PRIxADDR ";", hit_wp_address); break; case WPT_READ: snprintf(stop_reason, sizeof(stop_reason), "rwatch:%08" TARGET_PRIxADDR ";", hit_wp_address); break; case WPT_ACCESS: snprintf(stop_reason, sizeof(stop_reason), "awatch:%08" TARGET_PRIxADDR ";", hit_wp_address); break; default: break; } } } current_thread[0] = '\0'; if (target->rtos != NULL) { struct target *ct; snprintf(current_thread, sizeof(current_thread), "thread:%016" PRIx64 ";", target->rtos->current_thread); target->rtos->current_threadid = target->rtos->current_thread; target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &ct); if (!gdb_connection->ctrl_c) signal_var = gdb_last_signal(ct); } sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T%2.2x%s%s", signal_var, stop_reason, current_thread); gdb_connection->ctrl_c = 0; } gdb_put_packet(connection, sig_reply, sig_reply_len); gdb_connection->frontend_state = TARGET_HALTED; } static void gdb_fileio_reply(struct target *target, struct connection *connection) { struct gdb_connection *gdb_connection = connection->priv; char fileio_command[256]; int command_len; bool program_exited = false; if (strcmp(target->fileio_info->identifier, "open") == 0) sprintf(fileio_command, "F%s,%" PRIx64 "/%" PRIx64 ",%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3, target->fileio_info->param_4); else if (strcmp(target->fileio_info->identifier, "close") == 0) sprintf(fileio_command, "F%s,%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1); else if (strcmp(target->fileio_info->identifier, "read") == 0) sprintf(fileio_command, "F%s,%" PRIx64 ",%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3); else if (strcmp(target->fileio_info->identifier, "write") == 0) sprintf(fileio_command, "F%s,%" PRIx64 ",%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3); else if (strcmp(target->fileio_info->identifier, "lseek") == 0) sprintf(fileio_command, "F%s,%" PRIx64 ",%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3); else if (strcmp(target->fileio_info->identifier, "rename") == 0) sprintf(fileio_command, "F%s,%" PRIx64 "/%" PRIx64 ",%" PRIx64 "/%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3, target->fileio_info->param_4); else if (strcmp(target->fileio_info->identifier, "unlink") == 0) sprintf(fileio_command, "F%s,%" PRIx64 "/%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2); else if (strcmp(target->fileio_info->identifier, "stat") == 0) sprintf(fileio_command, "F%s,%" PRIx64 "/%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2, target->fileio_info->param_3); else if (strcmp(target->fileio_info->identifier, "fstat") == 0) sprintf(fileio_command, "F%s,%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2); else if (strcmp(target->fileio_info->identifier, "gettimeofday") == 0) sprintf(fileio_command, "F%s,%" PRIx64 ",%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2); else if (strcmp(target->fileio_info->identifier, "isatty") == 0) sprintf(fileio_command, "F%s,%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1); else if (strcmp(target->fileio_info->identifier, "system") == 0) sprintf(fileio_command, "F%s,%" PRIx64 "/%" PRIx64, target->fileio_info->identifier, target->fileio_info->param_1, target->fileio_info->param_2); else if (strcmp(target->fileio_info->identifier, "exit") == 0) { /* If target hits exit syscall, report to GDB the program is terminated. * In addition, let target run its own exit syscall handler. */ program_exited = true; sprintf(fileio_command, "W%02" PRIx64, target->fileio_info->param_1); } else { LOG_DEBUG("Unknown syscall: %s", target->fileio_info->identifier); /* encounter unknown syscall, continue */ gdb_connection->frontend_state = TARGET_RUNNING; target_resume(target, 1, 0x0, 0, 0); return; } command_len = strlen(fileio_command); gdb_put_packet(connection, fileio_command, command_len); if (program_exited) { /* Use target_resume() to let target run its own exit syscall handler. */ gdb_connection->frontend_state = TARGET_RUNNING; target_resume(target, 1, 0x0, 0, 0); } else { gdb_connection->frontend_state = TARGET_HALTED; rtos_update_threads(target); } } static void gdb_frontend_halted(struct target *target, struct connection *connection) { struct gdb_connection *gdb_connection = connection->priv; /* In the GDB protocol when we are stepping or continuing execution, * we have a lingering reply. Upon receiving a halted event * when we have that lingering packet, we reply to the original * step or continue packet. * * Executing monitor commands can bring the target in and * out of the running state so we'll see lots of TARGET_EVENT_XXX * that are to be ignored. */ if (gdb_connection->frontend_state == TARGET_RUNNING) { /* stop forwarding log packets! */ log_remove_callback(gdb_log_callback, connection); /* check fileio first */ if (target_get_gdb_fileio_info(target, target->fileio_info) == ERROR_OK) gdb_fileio_reply(target, connection); else gdb_signal_reply(target, connection); } } static int gdb_target_callback_event_handler(struct target *target, enum target_event event, void *priv) { int retval; struct connection *connection = priv; struct gdb_service *gdb_service = connection->service->priv; if (gdb_service->target != target) return ERROR_OK; switch (event) { case TARGET_EVENT_GDB_HALT: gdb_frontend_halted(target, connection); break; case TARGET_EVENT_HALTED: target_call_event_callbacks(target, TARGET_EVENT_GDB_END); break; case TARGET_EVENT_GDB_FLASH_ERASE_START: retval = jtag_execute_queue(); if (retval != ERROR_OK) return retval; break; default: break; } return ERROR_OK; } static int gdb_new_connection(struct connection *connection) { struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection)); struct target *target; int retval; int initial_ack; target = get_target_from_connection(connection); connection->priv = gdb_connection; connection->cmd_ctx->current_target = target; /* initialize gdb connection information */ gdb_connection->buf_p = gdb_connection->buffer; gdb_connection->buf_cnt = 0; gdb_connection->ctrl_c = 0; gdb_connection->frontend_state = TARGET_HALTED; gdb_connection->vflash_image = NULL; gdb_connection->closed = false; gdb_connection->busy = false; gdb_connection->noack_mode = 0; gdb_connection->sync = false; gdb_connection->mem_write_error = false; gdb_connection->attached = true; gdb_connection->target_desc.tdesc = NULL; gdb_connection->target_desc.tdesc_length = 0; gdb_connection->thread_list = NULL; /* send ACK to GDB for debug request */ gdb_write(connection, "+", 1); /* output goes through gdb connection */ command_set_output_handler(connection->cmd_ctx, gdb_output, connection); /* we must remove all breakpoints registered to the target as a previous * GDB session could leave dangling breakpoints if e.g. communication * timed out. */ breakpoint_clear_target(target); watchpoint_clear_target(target); if (target->rtos) { /* clean previous rtos session if supported*/ if (target->rtos->type->clean) target->rtos->type->clean(target); /* update threads */ rtos_update_threads(target); } /* remove the initial ACK from the incoming buffer */ retval = gdb_get_char(connection, &initial_ack); if (retval != ERROR_OK) return retval; /* FIX!!!??? would we actually ever receive a + here??? * Not observed. */ if (initial_ack != '+') gdb_putback_char(connection, initial_ack); target_call_event_callbacks(target, TARGET_EVENT_GDB_ATTACH); if (gdb_use_memory_map) { /* Connect must fail if the memory map can't be set up correctly. * * This will cause an auto_probe to be invoked, which is either * a no-op or it will fail when the target isn't ready(e.g. not halted). */ int i; for (i = 0; i < flash_get_bank_count(); i++) { struct flash_bank *p; p = get_flash_bank_by_num_noprobe(i); if (p->target != target) continue; retval = get_flash_bank_by_num(i, &p); if (retval != ERROR_OK) { LOG_ERROR("Connect failed. Consider setting up a gdb-attach event for the target " \ "to prepare target for GDB connect, or use 'gdb_memory_map disable'."); return retval; } } } gdb_actual_connections++; log_printf_lf(all_targets->next != NULL ? LOG_LVL_INFO : LOG_LVL_DEBUG, __FILE__, __LINE__, __func__, "New GDB Connection: %d, Target %s, state: %s", gdb_actual_connections, target_name(target), target_state_name(target)); /* DANGER! If we fail subsequently, we must remove this handler, * otherwise we occasionally see crashes as the timer can invoke the * callback fn. * * register callback to be informed about target events */ target_register_event_callback(gdb_target_callback_event_handler, connection); return ERROR_OK; } static int gdb_connection_closed(struct connection *connection) { struct target *target; struct gdb_connection *gdb_connection = connection->priv; target = get_target_from_connection(connection); /* we're done forwarding messages. Tear down callback before * cleaning up connection. */ log_remove_callback(gdb_log_callback, connection); gdb_actual_connections--; LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d", target_name(target), target_state_name(target), gdb_actual_connections); /* see if an image built with vFlash commands is left */ if (gdb_connection->vflash_image) { image_close(gdb_connection->vflash_image); free(gdb_connection->vflash_image); gdb_connection->vflash_image = NULL; } /* if this connection registered a debug-message receiver delete it */ delete_debug_msg_receiver(connection->cmd_ctx, target); if (connection->priv) { free(connection->priv); connection->priv = NULL; } else LOG_ERROR("BUG: connection->priv == NULL"); target_unregister_event_callback(gdb_target_callback_event_handler, connection); target_call_event_callbacks(target, TARGET_EVENT_GDB_END); target_call_event_callbacks(target, TARGET_EVENT_GDB_DETACH); return ERROR_OK; } static void gdb_send_error(struct connection *connection, uint8_t the_error) { char err[4]; snprintf(err, 4, "E%2.2X", the_error); gdb_put_packet(connection, err, 3); } static int gdb_last_signal_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); struct gdb_connection *gdb_con = connection->priv; char sig_reply[4]; int signal_var; if (!gdb_con->attached) { /* if we are here we have received a kill packet * reply W stop reply otherwise gdb gets very unhappy */ gdb_put_packet(connection, "W00", 3); return ERROR_OK; } signal_var = gdb_last_signal(target); snprintf(sig_reply, 4, "S%2.2x", signal_var); gdb_put_packet(connection, sig_reply, 3); return ERROR_OK; } static inline int gdb_reg_pos(struct target *target, int pos, int len) { if (target->endianness == TARGET_LITTLE_ENDIAN) return pos; else return len - 1 - pos; } /* Convert register to string of bytes. NB! The # of bits in the * register might be non-divisible by 8(a byte), in which * case an entire byte is shown. * * NB! the format on the wire is the target endianness * * The format of reg->value is little endian * */ static void gdb_str_to_target(struct target *target, char *tstr, struct reg *reg) { int i; uint8_t *buf; int buf_len; buf = reg->value; buf_len = DIV_ROUND_UP(reg->size, 8); for (i = 0; i < buf_len; i++) { int j = gdb_reg_pos(target, i, buf_len); tstr += sprintf(tstr, "%02x", buf[j]); } } /* copy over in register buffer */ static void gdb_target_to_reg(struct target *target, char const *tstr, int str_len, uint8_t *bin) { if (str_len % 2) { LOG_ERROR("BUG: gdb value with uneven number of characters encountered"); exit(-1); } int i; for (i = 0; i < str_len; i += 2) { unsigned t; if (sscanf(tstr + i, "%02x", &t) != 1) { LOG_ERROR("BUG: unable to convert register value"); exit(-1); } int j = gdb_reg_pos(target, i/2, str_len/2); bin[j] = t; } } static int gdb_get_registers_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); struct reg **reg_list; int reg_list_size; int retval; int reg_packet_size = 0; char *reg_packet; char *reg_packet_p; int i; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("-"); #endif if ((target->rtos != NULL) && (ERROR_OK == rtos_get_gdb_reg_list(connection))) return ERROR_OK; retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_GENERAL); if (retval != ERROR_OK) return gdb_error(connection, retval); for (i = 0; i < reg_list_size; i++) reg_packet_size += DIV_ROUND_UP(reg_list[i]->size, 8) * 2; assert(reg_packet_size > 0); reg_packet = malloc(reg_packet_size + 1); /* plus one for string termination null */ if (reg_packet == NULL) return ERROR_FAIL; reg_packet_p = reg_packet; for (i = 0; i < reg_list_size; i++) { if (!reg_list[i]->valid) { retval = reg_list[i]->type->get(reg_list[i]); if (retval != ERROR_OK && gdb_report_register_access_error) { LOG_DEBUG("Couldn't get register %s.", reg_list[i]->name); free(reg_packet); free(reg_list); return gdb_error(connection, retval); } } gdb_str_to_target(target, reg_packet_p, reg_list[i]); reg_packet_p += DIV_ROUND_UP(reg_list[i]->size, 8) * 2; } #ifdef _DEBUG_GDB_IO_ { char *reg_packet_p_debug; reg_packet_p_debug = strndup(reg_packet, reg_packet_size); LOG_DEBUG("reg_packet: %s", reg_packet_p_debug); free(reg_packet_p_debug); } #endif gdb_put_packet(connection, reg_packet, reg_packet_size); free(reg_packet); free(reg_list); return ERROR_OK; } static int gdb_set_registers_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); int i; struct reg **reg_list; int reg_list_size; int retval; char const *packet_p; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("-"); #endif /* skip command character */ packet++; packet_size--; if (packet_size % 2) { LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_GENERAL); if (retval != ERROR_OK) return gdb_error(connection, retval); packet_p = packet; for (i = 0; i < reg_list_size; i++) { uint8_t *bin_buf; int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2); if (packet_p + chars > packet + packet_size) LOG_ERROR("BUG: register packet is too small for registers"); bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8)); gdb_target_to_reg(target, packet_p, chars, bin_buf); retval = reg_list[i]->type->set(reg_list[i], bin_buf); if (retval != ERROR_OK && gdb_report_register_access_error) { LOG_DEBUG("Couldn't set register %s.", reg_list[i]->name); free(reg_list); free(bin_buf); return gdb_error(connection, retval); } /* advance packet pointer */ packet_p += chars; free(bin_buf); } /* free struct reg *reg_list[] array allocated by get_gdb_reg_list */ free(reg_list); gdb_put_packet(connection, "OK", 2); return ERROR_OK; } static int gdb_get_register_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *reg_packet; int reg_num = strtoul(packet + 1, NULL, 16); struct reg **reg_list; int reg_list_size; int retval; #ifdef _DEBUG_GDB_IO_ LOG_DEBUG("-"); #endif retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_ALL); if (retval != ERROR_OK) return gdb_error(connection, retval); if (reg_list_size <= reg_num) { LOG_ERROR("gdb requested a non-existing register"); return ERROR_SERVER_REMOTE_CLOSED; } if (!reg_list[reg_num]->valid) { retval = reg_list[reg_num]->type->get(reg_list[reg_num]); if (retval != ERROR_OK && gdb_report_register_access_error) { LOG_DEBUG("Couldn't get register %s.", reg_list[reg_num]->name); free(reg_list); return gdb_error(connection, retval); } } reg_packet = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2 + 1); /* plus one for string termination null */ gdb_str_to_target(target, reg_packet, reg_list[reg_num]); gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2); free(reg_list); free(reg_packet); return ERROR_OK; } static int gdb_set_register_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *separator; uint8_t *bin_buf; int reg_num = strtoul(packet + 1, &separator, 16); struct reg **reg_list; int reg_list_size; int retval; LOG_DEBUG("-"); retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_ALL); if (retval != ERROR_OK) return gdb_error(connection, retval); if (reg_list_size <= reg_num) { LOG_ERROR("gdb requested a non-existing register"); return ERROR_SERVER_REMOTE_CLOSED; } if (*separator != '=') { LOG_ERROR("GDB 'set register packet', but no '=' following the register number"); return ERROR_SERVER_REMOTE_CLOSED; } /* convert from GDB-string (target-endian) to hex-string (big-endian) */ bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8)); int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2); if ((unsigned int)chars != strlen(separator + 1)) { LOG_ERROR("gdb sent %zu bits for a %d-bit register (%s)", strlen(separator + 1) * 4, chars * 4, reg_list[reg_num]->name); free(bin_buf); return ERROR_SERVER_REMOTE_CLOSED; } gdb_target_to_reg(target, separator + 1, chars, bin_buf); retval = reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf); if (retval != ERROR_OK && gdb_report_register_access_error) { LOG_DEBUG("Couldn't set register %s.", reg_list[reg_num]->name); free(bin_buf); free(reg_list); return gdb_error(connection, retval); } gdb_put_packet(connection, "OK", 2); free(bin_buf); free(reg_list); return ERROR_OK; } /* No attempt is made to translate the "retval" to * GDB speak. This has to be done at the calling * site as no mapping really exists. */ static int gdb_error(struct connection *connection, int retval) { LOG_DEBUG("Reporting %i to GDB as generic error", retval); gdb_send_error(connection, EFAULT); return ERROR_OK; } /* We don't have to worry about the default 2 second timeout for GDB packets, * because GDB breaks up large memory reads into smaller reads. * * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192????? */ static int gdb_read_memory_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *separator; uint64_t addr = 0; uint32_t len = 0; uint8_t *buffer; char *hex_buffer; int retval = ERROR_OK; /* skip command character */ packet++; addr = strtoull(packet, &separator, 16); if (*separator != ',') { LOG_ERROR("incomplete read memory packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator + 1, NULL, 16); if (!len) { LOG_WARNING("invalid read memory packet received (len == 0)"); gdb_put_packet(connection, NULL, 0); return ERROR_OK; } buffer = malloc(len); LOG_DEBUG("addr: 0x%16.16" PRIx64 ", len: 0x%8.8" PRIx32 "", addr, len); retval = target_read_buffer(target, addr, len, buffer); if ((retval != ERROR_OK) && !gdb_report_data_abort) { /* TODO : Here we have to lie and send back all zero's lest stack traces won't work. * At some point this might be fixed in GDB, in which case this code can be removed. * * OpenOCD developers are acutely aware of this problem, but there is nothing * gained by involving the user in this problem that hopefully will get resolved * eventually * * http://sourceware.org/cgi-bin/gnatsweb.pl? \ * cmd = view%20audit-trail&database = gdb&pr = 2395 * * For now, the default is to fix up things to make current GDB versions work. * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command. */ memset(buffer, 0, len); retval = ERROR_OK; } if (retval == ERROR_OK) { hex_buffer = malloc(len * 2 + 1); size_t pkt_len = hexify(hex_buffer, buffer, len, len * 2 + 1); gdb_put_packet(connection, hex_buffer, pkt_len); free(hex_buffer); } else retval = gdb_error(connection, retval); free(buffer); return retval; } static int gdb_write_memory_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *separator; uint64_t addr = 0; uint32_t len = 0; uint8_t *buffer; int retval; /* skip command character */ packet++; addr = strtoull(packet, &separator, 16); if (*separator != ',') { LOG_ERROR("incomplete write memory packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator + 1, &separator, 16); if (*(separator++) != ':') { LOG_ERROR("incomplete write memory packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } buffer = malloc(len); LOG_DEBUG("addr: 0x%" PRIx64 ", len: 0x%8.8" PRIx32 "", addr, len); if (unhexify(buffer, separator, len) != len) LOG_ERROR("unable to decode memory packet"); retval = target_write_buffer(target, addr, len, buffer); if (retval == ERROR_OK) gdb_put_packet(connection, "OK", 2); else retval = gdb_error(connection, retval); free(buffer); return retval; } static int gdb_write_memory_binary_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *separator; uint64_t addr = 0; uint32_t len = 0; int retval = ERROR_OK; /* Packets larger than fast_limit bytes will be acknowledged instantly on * the assumption that we're in a download and it's important to go as fast * as possible. */ uint32_t fast_limit = 8; /* skip command character */ packet++; addr = strtoull(packet, &separator, 16); if (*separator != ',') { LOG_ERROR("incomplete write memory binary packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator + 1, &separator, 16); if (*(separator++) != ':') { LOG_ERROR("incomplete write memory binary packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } struct gdb_connection *gdb_connection = connection->priv; if (gdb_connection->mem_write_error) retval = ERROR_FAIL; if (retval == ERROR_OK) { if (len >= fast_limit) { /* By replying the packet *immediately* GDB will send us a new packet * while we write the last one to the target. * We only do this for larger writes, so that users who do something like: * p *((int*)0xdeadbeef)=8675309 * will get immediate feedback that that write failed. */ gdb_put_packet(connection, "OK", 2); } } else { retval = gdb_error(connection, retval); /* now that we have reported the memory write error, we can clear the condition */ gdb_connection->mem_write_error = false; if (retval != ERROR_OK) return retval; } if (len) { LOG_DEBUG("addr: 0x%" PRIx64 ", len: 0x%8.8" PRIx32 "", addr, len); retval = target_write_buffer(target, addr, len, (uint8_t *)separator); if (retval != ERROR_OK) gdb_connection->mem_write_error = true; } if (len < fast_limit) { if (retval != ERROR_OK) { gdb_error(connection, retval); gdb_connection->mem_write_error = false; } else { gdb_put_packet(connection, "OK", 2); } } return ERROR_OK; } static int gdb_step_continue_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); int current = 0; uint64_t address = 0x0; int retval = ERROR_OK; LOG_DEBUG("-"); if (packet_size > 1) address = strtoull(packet + 1, NULL, 16); else current = 1; gdb_running_type = packet[0]; if (packet[0] == 'c') { LOG_DEBUG("continue"); /* resume at current address, don't handle breakpoints, not debugging */ retval = target_resume(target, current, address, 0, 0); } else if (packet[0] == 's') { LOG_DEBUG("step"); /* step at current or address, don't handle breakpoints */ retval = target_step(target, current, address, 0); } return retval; } static int gdb_breakpoint_watchpoint_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); int type; enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */; enum watchpoint_rw wp_type = WPT_READ /* dummy init to avoid warning */; uint64_t address; uint32_t size; char *separator; int retval; LOG_DEBUG("-"); type = strtoul(packet + 1, &separator, 16); if (type == 0) /* memory breakpoint */ bp_type = BKPT_SOFT; else if (type == 1) /* hardware breakpoint */ bp_type = BKPT_HARD; else if (type == 2) /* write watchpoint */ wp_type = WPT_WRITE; else if (type == 3) /* read watchpoint */ wp_type = WPT_READ; else if (type == 4) /* access watchpoint */ wp_type = WPT_ACCESS; else { LOG_ERROR("invalid gdb watch/breakpoint type(%d), dropping connection", type); return ERROR_SERVER_REMOTE_CLOSED; } if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT) || (bp_type == BKPT_HARD))) bp_type = gdb_breakpoint_override_type; if (*separator != ',') { LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } address = strtoull(separator + 1, &separator, 16); if (*separator != ',') { LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } size = strtoul(separator + 1, &separator, 16); switch (type) { case 0: case 1: if (packet[0] == 'Z') { retval = breakpoint_add(target, address, size, bp_type); if (retval != ERROR_OK) { retval = gdb_error(connection, retval); if (retval != ERROR_OK) return retval; } else gdb_put_packet(connection, "OK", 2); } else { breakpoint_remove(target, address); gdb_put_packet(connection, "OK", 2); } break; case 2: case 3: case 4: { if (packet[0] == 'Z') { retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu); if (retval != ERROR_OK) { retval = gdb_error(connection, retval); if (retval != ERROR_OK) return retval; } else gdb_put_packet(connection, "OK", 2); } else { watchpoint_remove(target, address); gdb_put_packet(connection, "OK", 2); } break; } default: break; } return ERROR_OK; } /* print out a string and allocate more space as needed, * mainly used for XML at this point */ static void xml_printf(int *retval, char **xml, int *pos, int *size, const char *fmt, ...) { if (*retval != ERROR_OK) return; int first = 1; for (;; ) { if ((*xml == NULL) || (!first)) { /* start by 0 to exercise all the code paths. * Need minimum 2 bytes to fit 1 char and 0 terminator. */ *size = *size * 2 + 2; char *t = *xml; *xml = realloc(*xml, *size); if (*xml == NULL) { if (t) free(t); *retval = ERROR_SERVER_REMOTE_CLOSED; return; } } va_list ap; int ret; va_start(ap, fmt); ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap); va_end(ap); if ((ret > 0) && ((ret + 1) < *size - *pos)) { *pos += ret; return; } /* there was just enough or not enough space, allocate more. */ first = 0; } } static int decode_xfer_read(char const *buf, char **annex, int *ofs, unsigned int *len) { /* Locate the annex. */ const char *annex_end = strchr(buf, ':'); if (annex_end == NULL) return ERROR_FAIL; /* After the read marker and annex, qXfer looks like a * traditional 'm' packet. */ char *separator; *ofs = strtoul(annex_end + 1, &separator, 16); if (*separator != ',') return ERROR_FAIL; *len = strtoul(separator + 1, NULL, 16); /* Extract the annex if needed */ if (annex != NULL) { *annex = strndup(buf, annex_end - buf); if (*annex == NULL) return ERROR_FAIL; } return ERROR_OK; } static int compare_bank(const void *a, const void *b) { struct flash_bank *b1, *b2; b1 = *((struct flash_bank **)a); b2 = *((struct flash_bank **)b); if (b1->base == b2->base) return 0; else if (b1->base > b2->base) return 1; else return -1; } static int gdb_memory_map(struct connection *connection, char const *packet, int packet_size) { /* We get away with only specifying flash here. Regions that are not * specified are treated as if we provided no memory map(if not we * could detect the holes and mark them as RAM). * Normally we only execute this code once, but no big deal if we * have to regenerate it a couple of times. */ struct target *target = get_target_from_connection(connection); struct flash_bank *p; char *xml = NULL; int size = 0; int pos = 0; int retval = ERROR_OK; struct flash_bank **banks; int offset; int length; char *separator; target_addr_t ram_start = 0; int i; int target_flash_banks = 0; /* skip command character */ packet += 23; offset = strtoul(packet, &separator, 16); length = strtoul(separator + 1, &separator, 16); xml_printf(&retval, &xml, &pos, &size, "\n"); /* Sort banks in ascending order. We need to report non-flash * memory as ram (or rather read/write) by default for GDB, since * it has no concept of non-cacheable read/write memory (i/o etc). */ banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count()); for (i = 0; i < flash_get_bank_count(); i++) { p = get_flash_bank_by_num_noprobe(i); if (p->target != target) continue; retval = get_flash_bank_by_num(i, &p); if (retval != ERROR_OK) { free(banks); gdb_error(connection, retval); return retval; } banks[target_flash_banks++] = p; } qsort(banks, target_flash_banks, sizeof(struct flash_bank *), compare_bank); for (i = 0; i < target_flash_banks; i++) { int j; unsigned sector_size = 0; unsigned group_len = 0; p = banks[i]; if (ram_start < p->base) xml_printf(&retval, &xml, &pos, &size, "\n", ram_start, p->base - ram_start); /* Report adjacent groups of same-size sectors. So for * example top boot CFI flash will list an initial region * with several large sectors (maybe 128KB) and several * smaller ones at the end (maybe 32KB). STR7 will have * regions with 8KB, 32KB, and 64KB sectors; etc. */ for (j = 0; j < p->num_sectors; j++) { /* Maybe start a new group of sectors. */ if (sector_size == 0) { if (p->sectors[j].offset + p->sectors[j].size > p->size) { LOG_WARNING("The flash sector at offset 0x%08" PRIx32 " overflows the end of %s bank.", p->sectors[j].offset, p->name); LOG_WARNING("The rest of bank will not show in gdb memory map."); break; } target_addr_t start; start = p->base + p->sectors[j].offset; xml_printf(&retval, &xml, &pos, &size, "sectors[j].size; group_len = sector_size; } else { group_len += sector_size; /* equal to p->sectors[j].size */ } /* Does this finish a group of sectors? * If not, continue an already-started group. */ if (j < p->num_sectors - 1 && p->sectors[j + 1].size == sector_size && p->sectors[j + 1].offset == p->sectors[j].offset + sector_size && p->sectors[j + 1].offset + p->sectors[j + 1].size <= p->size) continue; xml_printf(&retval, &xml, &pos, &size, "length=\"0x%x\">\n" "" "0x%x\n" "\n", group_len, sector_size); sector_size = 0; } ram_start = p->base + p->size; } if (ram_start != 0) xml_printf(&retval, &xml, &pos, &size, "\n", ram_start, 0-ram_start); /* ELSE a flash chip could be at the very end of the 32 bit address * space, in which case ram_start will be precisely 0 */ free(banks); xml_printf(&retval, &xml, &pos, &size, "\n"); if (retval != ERROR_OK) { free(xml); gdb_error(connection, retval); return retval; } if (offset + length > pos) length = pos - offset; char *t = malloc(length + 1); t[0] = 'l'; memcpy(t + 1, xml + offset, length); gdb_put_packet(connection, t, length + 1); free(t); free(xml); return ERROR_OK; } static const char *gdb_get_reg_type_name(enum reg_type type) { switch (type) { case REG_TYPE_BOOL: return "bool"; case REG_TYPE_INT: return "int"; case REG_TYPE_INT8: return "int8"; case REG_TYPE_INT16: return "int16"; case REG_TYPE_INT32: return "int32"; case REG_TYPE_INT64: return "int64"; case REG_TYPE_INT128: return "int128"; case REG_TYPE_UINT: return "uint"; case REG_TYPE_UINT8: return "uint8"; case REG_TYPE_UINT16: return "uint16"; case REG_TYPE_UINT32: return "uint32"; case REG_TYPE_UINT64: return "uint64"; case REG_TYPE_UINT128: return "uint128"; case REG_TYPE_CODE_PTR: return "code_ptr"; case REG_TYPE_DATA_PTR: return "data_ptr"; case REG_TYPE_FLOAT: return "float"; case REG_TYPE_IEEE_SINGLE: return "ieee_single"; case REG_TYPE_IEEE_DOUBLE: return "ieee_double"; case REG_TYPE_ARCH_DEFINED: return "int"; /* return arbitrary string to avoid compile warning. */ } return "int"; /* "int" as default value */ } static int lookup_add_arch_defined_types(char const **arch_defined_types_list[], const char *type_id, int *num_arch_defined_types) { int tbl_sz = *num_arch_defined_types; if (type_id != NULL && (strcmp(type_id, ""))) { for (int j = 0; j < (tbl_sz + 1); j++) { if (!((*arch_defined_types_list)[j])) { (*arch_defined_types_list)[tbl_sz++] = type_id; *arch_defined_types_list = realloc(*arch_defined_types_list, sizeof(char *) * (tbl_sz + 1)); (*arch_defined_types_list)[tbl_sz] = NULL; *num_arch_defined_types = tbl_sz; return 1; } else { if (!strcmp((*arch_defined_types_list)[j], type_id)) return 0; } } } return -1; } static int gdb_generate_reg_type_description(struct target *target, char **tdesc, int *pos, int *size, struct reg_data_type *type, char const **arch_defined_types_list[], int * num_arch_defined_types) { int retval = ERROR_OK; if (type->type_class == REG_TYPE_CLASS_VECTOR) { struct reg_data_type *data_type = type->reg_type_vector->type; if (data_type->type == REG_TYPE_ARCH_DEFINED) { if (lookup_add_arch_defined_types(arch_defined_types_list, data_type->id, num_arch_defined_types)) gdb_generate_reg_type_description(target, tdesc, pos, size, data_type, arch_defined_types_list, num_arch_defined_types); } /* */ xml_printf(&retval, tdesc, pos, size, "\n", type->id, type->reg_type_vector->type->id, type->reg_type_vector->count); } else if (type->type_class == REG_TYPE_CLASS_UNION) { struct reg_data_type_union_field *field; field = type->reg_type_union->fields; while (field != NULL) { struct reg_data_type *data_type = field->type; if (data_type->type == REG_TYPE_ARCH_DEFINED) { if (lookup_add_arch_defined_types(arch_defined_types_list, data_type->id, num_arch_defined_types)) gdb_generate_reg_type_description(target, tdesc, pos, size, data_type, arch_defined_types_list, num_arch_defined_types); } field = field->next; } /* * ... * */ xml_printf(&retval, tdesc, pos, size, "\n", type->id); field = type->reg_type_union->fields; while (field != NULL) { xml_printf(&retval, tdesc, pos, size, "\n", field->name, field->type->id); field = field->next; } xml_printf(&retval, tdesc, pos, size, "\n"); } else if (type->type_class == REG_TYPE_CLASS_STRUCT) { struct reg_data_type_struct_field *field; field = type->reg_type_struct->fields; if (field->use_bitfields) { /* * ... * */ xml_printf(&retval, tdesc, pos, size, "\n", type->id, type->reg_type_struct->size); while (field != NULL) { xml_printf(&retval, tdesc, pos, size, "\n", field->name, field->bitfield->start, field->bitfield->end, gdb_get_reg_type_name(field->bitfield->type)); field = field->next; } } else { while (field != NULL) { struct reg_data_type *data_type = field->type; if (data_type->type == REG_TYPE_ARCH_DEFINED) { if (lookup_add_arch_defined_types(arch_defined_types_list, data_type->id, num_arch_defined_types)) gdb_generate_reg_type_description(target, tdesc, pos, size, data_type, arch_defined_types_list, num_arch_defined_types); } } /* * ... * */ xml_printf(&retval, tdesc, pos, size, "\n", type->id); while (field != NULL) { xml_printf(&retval, tdesc, pos, size, "\n", field->name, field->type->id); field = field->next; } } xml_printf(&retval, tdesc, pos, size, "\n"); } else if (type->type_class == REG_TYPE_CLASS_FLAGS) { /* * ... * */ xml_printf(&retval, tdesc, pos, size, "\n", type->id, type->reg_type_flags->size); struct reg_data_type_flags_field *field; field = type->reg_type_flags->fields; while (field != NULL) { xml_printf(&retval, tdesc, pos, size, "\n", field->name, field->bitfield->start, field->bitfield->end, gdb_get_reg_type_name(field->bitfield->type)); field = field->next; } xml_printf(&retval, tdesc, pos, size, "\n"); } return ERROR_OK; } /* Get a list of available target registers features. feature_list must * be freed by caller. */ static int get_reg_features_list(struct target *target, char const **feature_list[], int *feature_list_size, struct reg **reg_list, int reg_list_size) { int tbl_sz = 0; /* Start with only one element */ *feature_list = calloc(1, sizeof(char *)); for (int i = 0; i < reg_list_size; i++) { if (reg_list[i]->exist == false) continue; if (reg_list[i]->feature != NULL && reg_list[i]->feature->name != NULL && (strcmp(reg_list[i]->feature->name, ""))) { /* We found a feature, check if the feature is already in the * table. If not, allocate a new entry for the table and * put the new feature in it. */ for (int j = 0; j < (tbl_sz + 1); j++) { if (!((*feature_list)[j])) { (*feature_list)[tbl_sz++] = reg_list[i]->feature->name; *feature_list = realloc(*feature_list, sizeof(char *) * (tbl_sz + 1)); (*feature_list)[tbl_sz] = NULL; break; } else { if (!strcmp((*feature_list)[j], reg_list[i]->feature->name)) break; } } } } if (feature_list_size) *feature_list_size = tbl_sz; return ERROR_OK; } static int gdb_generate_target_description(struct target *target, char **tdesc_out) { int retval = ERROR_OK; struct reg **reg_list = NULL; int reg_list_size; char const **features = NULL; char const **arch_defined_types = NULL; int feature_list_size = 0; int num_arch_defined_types = 0; char *tdesc = NULL; int pos = 0; int size = 0; arch_defined_types = calloc(1, sizeof(char *)); retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_ALL); if (retval != ERROR_OK) { LOG_ERROR("get register list failed"); retval = ERROR_FAIL; goto error; } if (reg_list_size <= 0) { LOG_ERROR("get register list failed"); retval = ERROR_FAIL; goto error; } /* Get a list of available target registers features */ retval = get_reg_features_list(target, &features, &feature_list_size, reg_list, reg_list_size); if (retval != ERROR_OK) { LOG_ERROR("Can't get the registers feature list"); retval = ERROR_FAIL; goto error; } /* If we found some features associated with registers, create sections */ int current_feature = 0; xml_printf(&retval, &tdesc, &pos, &size, "\n" "\n" "\n"); /* generate target description according to register list */ if (features != NULL) { while (features[current_feature]) { xml_printf(&retval, &tdesc, &pos, &size, "\n", features[current_feature]); int i; for (i = 0; i < reg_list_size; i++) { if (reg_list[i]->exist == false) continue; if (strcmp(reg_list[i]->feature->name, features[current_feature])) continue; const char *type_str; if (reg_list[i]->reg_data_type != NULL) { if (reg_list[i]->reg_data_type->type == REG_TYPE_ARCH_DEFINED) { /* generate reg_data_type->id, &num_arch_defined_types)) gdb_generate_reg_type_description(target, &tdesc, &pos, &size, reg_list[i]->reg_data_type, &arch_defined_types, &num_arch_defined_types); type_str = reg_list[i]->reg_data_type->id; } else { /* predefined type */ type_str = gdb_get_reg_type_name( reg_list[i]->reg_data_type->type); } } else { /* Default type is "int" */ type_str = "int"; } xml_printf(&retval, &tdesc, &pos, &size, "name); xml_printf(&retval, &tdesc, &pos, &size, " bitsize=\"%d\"", reg_list[i]->size); xml_printf(&retval, &tdesc, &pos, &size, " regnum=\"%d\"", reg_list[i]->number); if (reg_list[i]->caller_save) xml_printf(&retval, &tdesc, &pos, &size, " save-restore=\"yes\""); else xml_printf(&retval, &tdesc, &pos, &size, " save-restore=\"no\""); xml_printf(&retval, &tdesc, &pos, &size, " type=\"%s\"", type_str); if (reg_list[i]->group != NULL) xml_printf(&retval, &tdesc, &pos, &size, " group=\"%s\"", reg_list[i]->group); xml_printf(&retval, &tdesc, &pos, &size, "/>\n"); } xml_printf(&retval, &tdesc, &pos, &size, "\n"); current_feature++; } } xml_printf(&retval, &tdesc, &pos, &size, "\n"); error: free(features); free(reg_list); free(arch_defined_types); if (retval == ERROR_OK) *tdesc_out = tdesc; else free(tdesc); return retval; } static int gdb_get_target_description_chunk(struct target *target, struct target_desc_format *target_desc, char **chunk, int32_t offset, uint32_t length) { if (target_desc == NULL) { LOG_ERROR("Unable to Generate Target Description"); return ERROR_FAIL; } char *tdesc = target_desc->tdesc; uint32_t tdesc_length = target_desc->tdesc_length; if (tdesc == NULL) { int retval = gdb_generate_target_description(target, &tdesc); if (retval != ERROR_OK) { LOG_ERROR("Unable to Generate Target Description"); return ERROR_FAIL; } tdesc_length = strlen(tdesc); } char transfer_type; if (length < (tdesc_length - offset)) transfer_type = 'm'; else transfer_type = 'l'; *chunk = malloc(length + 2); if (*chunk == NULL) { LOG_ERROR("Unable to allocate memory"); return ERROR_FAIL; } (*chunk)[0] = transfer_type; if (transfer_type == 'm') { strncpy((*chunk) + 1, tdesc + offset, length); (*chunk)[1 + length] = '\0'; } else { strncpy((*chunk) + 1, tdesc + offset, tdesc_length - offset); (*chunk)[1 + (tdesc_length - offset)] = '\0'; /* After gdb-server sends out last chunk, invalidate tdesc. */ free(tdesc); tdesc = NULL; tdesc_length = 0; } target_desc->tdesc = tdesc; target_desc->tdesc_length = tdesc_length; return ERROR_OK; } static int gdb_target_description_supported(struct target *target, int *supported) { int retval = ERROR_OK; struct reg **reg_list = NULL; int reg_list_size = 0; char const **features = NULL; int feature_list_size = 0; retval = target_get_gdb_reg_list(target, ®_list, ®_list_size, REG_CLASS_ALL); if (retval != ERROR_OK) { LOG_ERROR("get register list failed"); goto error; } if (reg_list_size <= 0) { LOG_ERROR("get register list failed"); retval = ERROR_FAIL; goto error; } /* Get a list of available target registers features */ retval = get_reg_features_list(target, &features, &feature_list_size, reg_list, reg_list_size); if (retval != ERROR_OK) { LOG_ERROR("Can't get the registers feature list"); goto error; } if (supported) { if (feature_list_size) *supported = 1; else *supported = 0; } error: free(features); free(reg_list); return retval; } static int gdb_generate_thread_list(struct target *target, char **thread_list_out) { struct rtos *rtos = target->rtos; int retval = ERROR_OK; char *thread_list = NULL; int pos = 0; int size = 0; xml_printf(&retval, &thread_list, &pos, &size, "\n" "\n"); if (rtos != NULL) { for (int i = 0; i < rtos->thread_count; i++) { struct thread_detail *thread_detail = &rtos->thread_details[i]; if (!thread_detail->exists) continue; xml_printf(&retval, &thread_list, &pos, &size, "", thread_detail->threadid); if (thread_detail->thread_name_str != NULL) xml_printf(&retval, &thread_list, &pos, &size, "Name: %s", thread_detail->thread_name_str); if (thread_detail->extra_info_str != NULL) { if (thread_detail->thread_name_str != NULL) xml_printf(&retval, &thread_list, &pos, &size, ", "); xml_printf(&retval, &thread_list, &pos, &size, thread_detail->extra_info_str); } xml_printf(&retval, &thread_list, &pos, &size, "\n"); } } xml_printf(&retval, &thread_list, &pos, &size, "\n"); if (retval == ERROR_OK) *thread_list_out = thread_list; else free(thread_list); return retval; } static int gdb_get_thread_list_chunk(struct target *target, char **thread_list, char **chunk, int32_t offset, uint32_t length) { if (*thread_list == NULL) { int retval = gdb_generate_thread_list(target, thread_list); if (retval != ERROR_OK) { LOG_ERROR("Unable to Generate Thread List"); return ERROR_FAIL; } } size_t thread_list_length = strlen(*thread_list); char transfer_type; length = MIN(length, thread_list_length - offset); if (length < (thread_list_length - offset)) transfer_type = 'm'; else transfer_type = 'l'; *chunk = malloc(length + 2 + 3); /* Allocating extra 3 bytes prevents false positive valgrind report * of strlen(chunk) word access: * Invalid read of size 4 * Address 0x4479934 is 44 bytes inside a block of size 45 alloc'd */ if (*chunk == NULL) { LOG_ERROR("Unable to allocate memory"); return ERROR_FAIL; } (*chunk)[0] = transfer_type; strncpy((*chunk) + 1, (*thread_list) + offset, length); (*chunk)[1 + length] = '\0'; /* After gdb-server sends out last chunk, invalidate thread list. */ if (transfer_type == 'l') { free(*thread_list); *thread_list = NULL; } return ERROR_OK; } static int gdb_query_packet(struct connection *connection, char const *packet, int packet_size) { struct command_context *cmd_ctx = connection->cmd_ctx; struct gdb_connection *gdb_connection = connection->priv; struct target *target = get_target_from_connection(connection); if (strncmp(packet, "qRcmd,", 6) == 0) { if (packet_size > 6) { char *cmd; cmd = malloc((packet_size - 6) / 2 + 1); size_t len = unhexify((uint8_t *)cmd, packet + 6, (packet_size - 6) / 2); cmd[len] = 0; /* We want to print all debug output to GDB connection */ log_add_callback(gdb_log_callback, connection); target_call_timer_callbacks_now(); /* some commands need to know the GDB connection, make note of current * GDB connection. */ current_gdb_connection = gdb_connection; command_run_line(cmd_ctx, cmd); current_gdb_connection = NULL; target_call_timer_callbacks_now(); log_remove_callback(gdb_log_callback, connection); free(cmd); } gdb_put_packet(connection, "OK", 2); return ERROR_OK; } else if (strncmp(packet, "qCRC:", 5) == 0) { if (packet_size > 5) { int retval; char gdb_reply[10]; char *separator; uint32_t checksum; target_addr_t addr = 0; uint32_t len = 0; /* skip command character */ packet += 5; addr = strtoull(packet, &separator, 16); if (*separator != ',') { LOG_ERROR("incomplete read memory packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator + 1, NULL, 16); retval = target_checksum_memory(target, addr, len, &checksum); if (retval == ERROR_OK) { snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum); gdb_put_packet(connection, gdb_reply, 9); } else { retval = gdb_error(connection, retval); if (retval != ERROR_OK) return retval; } return ERROR_OK; } } else if (strncmp(packet, "qSupported", 10) == 0) { /* we currently support packet size and qXfer:memory-map:read (if enabled) * qXfer:features:read is supported for some targets */ int retval = ERROR_OK; char *buffer = NULL; int pos = 0; int size = 0; int gdb_target_desc_supported = 0; /* we need to test that the target supports target descriptions */ retval = gdb_target_description_supported(target, &gdb_target_desc_supported); if (retval != ERROR_OK) { LOG_INFO("Failed detecting Target Description Support, disabling"); gdb_target_desc_supported = 0; } /* support may be disabled globally */ if (gdb_use_target_description == 0) { if (gdb_target_desc_supported) LOG_WARNING("Target Descriptions Supported, but disabled"); gdb_target_desc_supported = 0; } xml_printf(&retval, &buffer, &pos, &size, "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read%c;qXfer:threads:read+;QStartNoAckMode+;vContSupported+", (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-', (gdb_target_desc_supported == 1) ? '+' : '-'); if (retval != ERROR_OK) { gdb_send_error(connection, 01); return ERROR_OK; } gdb_put_packet(connection, buffer, strlen(buffer)); free(buffer); return ERROR_OK; } else if ((strncmp(packet, "qXfer:memory-map:read::", 23) == 0) && (flash_get_bank_count() > 0)) return gdb_memory_map(connection, packet, packet_size); else if (strncmp(packet, "qXfer:features:read:", 20) == 0) { char *xml = NULL; int retval = ERROR_OK; int offset; unsigned int length; /* skip command character */ packet += 20; if (decode_xfer_read(packet, NULL, &offset, &length) < 0) { gdb_send_error(connection, 01); return ERROR_OK; } /* Target should prepare correct target description for annex. * The first character of returned xml is 'm' or 'l'. 'm' for * there are *more* chunks to transfer. 'l' for it is the *last* * chunk of target description. */ retval = gdb_get_target_description_chunk(target, &gdb_connection->target_desc, &xml, offset, length); if (retval != ERROR_OK) { gdb_error(connection, retval); return retval; } gdb_put_packet(connection, xml, strlen(xml)); free(xml); return ERROR_OK; } else if (strncmp(packet, "qXfer:threads:read:", 19) == 0) { char *xml = NULL; int retval = ERROR_OK; int offset; unsigned int length; /* skip command character */ packet += 19; if (decode_xfer_read(packet, NULL, &offset, &length) < 0) { gdb_send_error(connection, 01); return ERROR_OK; } /* Target should prepare correct thread list for annex. * The first character of returned xml is 'm' or 'l'. 'm' for * there are *more* chunks to transfer. 'l' for it is the *last* * chunk of target description. */ retval = gdb_get_thread_list_chunk(target, &gdb_connection->thread_list, &xml, offset, length); if (retval != ERROR_OK) { gdb_error(connection, retval); return retval; } gdb_put_packet(connection, xml, strlen(xml)); free(xml); return ERROR_OK; } else if (strncmp(packet, "QStartNoAckMode", 15) == 0) { gdb_connection->noack_mode = 1; gdb_put_packet(connection, "OK", 2); return ERROR_OK; } gdb_put_packet(connection, "", 0); return ERROR_OK; } static bool gdb_handle_vcont_packet(struct connection *connection, const char *packet, int packet_size) { struct gdb_connection *gdb_connection = connection->priv; struct target *target = get_target_from_connection(connection); const char *parse = packet; int retval; /* query for vCont supported */ if (parse[0] == '?') { if (target->type->step != NULL) { /* gdb doesn't accept c without C and s without S */ gdb_put_packet(connection, "vCont;c;C;s;S", 13); return true; } return false; } if (parse[0] == ';') { ++parse; --packet_size; } /* simple case, a continue packet */ if (parse[0] == 'c') { gdb_running_type = 'c'; LOG_DEBUG("target %s continue", target_name(target)); log_add_callback(gdb_log_callback, connection); retval = target_resume(target, 1, 0, 0, 0); if (retval == ERROR_TARGET_NOT_HALTED) LOG_INFO("target %s was not halted when resume was requested", target_name(target)); /* poll target in an attempt to make its internal state consistent */ if (retval != ERROR_OK) { retval = target_poll(target); if (retval != ERROR_OK) LOG_DEBUG("error polling target %s after failed resume", target_name(target)); } /* * We don't report errors to gdb here, move frontend_state to * TARGET_RUNNING to stay in sync with gdb's expectation of the * target state */ gdb_connection->frontend_state = TARGET_RUNNING; target_call_event_callbacks(target, TARGET_EVENT_GDB_START); return true; } /* single-step or step-over-breakpoint */ if (parse[0] == 's') { gdb_running_type = 's'; bool fake_step = false; if (strncmp(parse, "s:", 2) == 0) { struct target *ct = target; int current_pc = 1; int64_t thread_id; char *endp; parse += 2; packet_size -= 2; thread_id = strtoll(parse, &endp, 16); if (endp != NULL) { packet_size -= endp - parse; parse = endp; } if (target->rtos != NULL) { /* FIXME: why is this necessary? rtos state should be up-to-date here already! */ rtos_update_threads(target); target->rtos->gdb_target_for_threadid(connection, thread_id, &ct); /* * check if the thread to be stepped is the current rtos thread * if not, we must fake the step */ if (target->rtos->current_thread != thread_id) fake_step = true; } if (parse[0] == ';') { ++parse; --packet_size; if (parse[0] == 'c') { parse += 1; packet_size -= 1; /* check if thread-id follows */ if (parse[0] == ':') { int64_t tid; parse += 1; packet_size -= 1; tid = strtoll(parse, &endp, 16); if (tid == thread_id) { /* * Special case: only step a single thread (core), * keep the other threads halted. Currently, only * aarch64 target understands it. Other target types don't * care (nobody checks the actual value of 'current') * and it doesn't really matter. This deserves * a symbolic constant and a formal interface documentation * at a later time. */ LOG_DEBUG("request to step current core only"); /* uncomment after checking that indeed other targets are safe */ /*current_pc = 2;*/ } } } } LOG_DEBUG("target %s single-step thread %"PRIx64, target_name(ct), thread_id); log_add_callback(gdb_log_callback, connection); target_call_event_callbacks(ct, TARGET_EVENT_GDB_START); /* * work around an annoying gdb behaviour: when the current thread * is changed in gdb, it assumes that the target can follow and also * make the thread current. This is an assumption that cannot hold * for a real target running a multi-threading OS. We just fake * the step to not trigger an internal error in gdb. See * https://sourceware.org/bugzilla/show_bug.cgi?id=22925 for details */ if (fake_step) { int sig_reply_len; char sig_reply[128]; LOG_DEBUG("fake step thread %"PRIx64, thread_id); sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T05thread:%016"PRIx64";", thread_id); gdb_put_packet(connection, sig_reply, sig_reply_len); log_remove_callback(gdb_log_callback, connection); return true; } /* support for gdb_sync command */ if (gdb_connection->sync) { gdb_connection->sync = false; if (ct->state == TARGET_HALTED) { LOG_WARNING("stepi ignored. GDB will now fetch the register state " \ "from the target."); gdb_sig_halted(connection); log_remove_callback(gdb_log_callback, connection); } else gdb_connection->frontend_state = TARGET_RUNNING; return true; } retval = target_step(ct, current_pc, 0, 0); if (retval == ERROR_TARGET_NOT_HALTED) LOG_INFO("target %s was not halted when step was requested", target_name(ct)); /* if step was successful send a reply back to gdb */ if (retval == ERROR_OK) { retval = target_poll(ct); if (retval != ERROR_OK) LOG_DEBUG("error polling target %s after successful step", target_name(ct)); /* send back signal information */ gdb_signal_reply(ct, connection); /* stop forwarding log packets! */ log_remove_callback(gdb_log_callback, connection); } else gdb_connection->frontend_state = TARGET_RUNNING; } else { LOG_ERROR("Unknown vCont packet"); return false; } return true; } return false; } static int gdb_v_packet(struct connection *connection, char const *packet, int packet_size) { struct gdb_connection *gdb_connection = connection->priv; struct target *target; int result; target = get_target_from_connection(connection); if (strncmp(packet, "vCont", 5) == 0) { bool handled; packet += 5; packet_size -= 5; handled = gdb_handle_vcont_packet(connection, packet, packet_size); if (!handled) gdb_put_packet(connection, "", 0); return ERROR_OK; } /* if flash programming disabled - send a empty reply */ if (gdb_flash_program == 0) { gdb_put_packet(connection, "", 0); return ERROR_OK; } if (strncmp(packet, "vFlashErase:", 12) == 0) { unsigned long addr; unsigned long length; char const *parse = packet + 12; if (*parse == '\0') { LOG_ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } addr = strtoul(parse, (char **)&parse, 16); if (*(parse++) != ',' || *parse == '\0') { LOG_ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } length = strtoul(parse, (char **)&parse, 16); if (*parse != '\0') { LOG_ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } /* assume all sectors need erasing - stops any problems * when flash_write is called multiple times */ flash_set_dirty(); /* perform any target specific operations before the erase */ target_call_event_callbacks(target, TARGET_EVENT_GDB_FLASH_ERASE_START); /* vFlashErase:addr,length messages require region start and * end to be "block" aligned ... if padding is ever needed, * GDB will have become dangerously confused. */ result = flash_erase_address_range(target, false, addr, length); /* perform any target specific operations after the erase */ target_call_event_callbacks(target, TARGET_EVENT_GDB_FLASH_ERASE_END); /* perform erase */ if (result != ERROR_OK) { /* GDB doesn't evaluate the actual error number returned, * treat a failed erase as an I/O error */ gdb_send_error(connection, EIO); LOG_ERROR("flash_erase returned %i", result); } else gdb_put_packet(connection, "OK", 2); return ERROR_OK; } if (strncmp(packet, "vFlashWrite:", 12) == 0) { int retval; unsigned long addr; unsigned long length; char const *parse = packet + 12; if (*parse == '\0') { LOG_ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } addr = strtoul(parse, (char **)&parse, 16); if (*(parse++) != ':') { LOG_ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } length = packet_size - (parse - packet); /* create a new image if there isn't already one */ if (gdb_connection->vflash_image == NULL) { gdb_connection->vflash_image = malloc(sizeof(struct image)); image_open(gdb_connection->vflash_image, "", "build"); } /* create new section with content from packet buffer */ retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t const *)parse); if (retval != ERROR_OK) return retval; gdb_put_packet(connection, "OK", 2); return ERROR_OK; } if (strncmp(packet, "vFlashDone", 10) == 0) { uint32_t written; /* process the flashing buffer. No need to erase as GDB * always issues a vFlashErase first. */ target_call_event_callbacks(target, TARGET_EVENT_GDB_FLASH_WRITE_START); result = flash_write(target, gdb_connection->vflash_image, &written, 0); target_call_event_callbacks(target, TARGET_EVENT_GDB_FLASH_WRITE_END); if (result != ERROR_OK) { if (result == ERROR_FLASH_DST_OUT_OF_BANK) gdb_put_packet(connection, "E.memtype", 9); else gdb_send_error(connection, EIO); } else { LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written); gdb_put_packet(connection, "OK", 2); } image_close(gdb_connection->vflash_image); free(gdb_connection->vflash_image); gdb_connection->vflash_image = NULL; return ERROR_OK; } gdb_put_packet(connection, "", 0); return ERROR_OK; } static int gdb_detach(struct connection *connection) { /* * Only reply "OK" to GDB * it will close the connection and this will trigger a call to * gdb_connection_closed() that will in turn trigger the event * TARGET_EVENT_GDB_DETACH */ return gdb_put_packet(connection, "OK", 2); } /* The format of 'F' response packet is * Fretcode,errno,Ctrl-C flag;call-specific attachment */ static int gdb_fileio_response_packet(struct connection *connection, char const *packet, int packet_size) { struct target *target = get_target_from_connection(connection); char *separator; char *parsing_point; int fileio_retcode = strtoul(packet + 1, &separator, 16); int fileio_errno = 0; bool fileio_ctrl_c = false; int retval; LOG_DEBUG("-"); if (*separator == ',') { parsing_point = separator + 1; fileio_errno = strtoul(parsing_point, &separator, 16); if (*separator == ',') { if (*(separator + 1) == 'C') { /* TODO: process ctrl-c */ fileio_ctrl_c = true; } } } LOG_DEBUG("File-I/O response, retcode: 0x%x, errno: 0x%x, ctrl-c: %s", fileio_retcode, fileio_errno, fileio_ctrl_c ? "true" : "false"); retval = target_gdb_fileio_end(target, fileio_retcode, fileio_errno, fileio_ctrl_c); if (retval != ERROR_OK) return ERROR_FAIL; /* After File-I/O ends, keep continue or step */ if (gdb_running_type == 'c') retval = target_resume(target, 1, 0x0, 0, 0); else if (gdb_running_type == 's') retval = target_step(target, 1, 0x0, 0); else retval = ERROR_FAIL; if (retval != ERROR_OK) return ERROR_FAIL; return ERROR_OK; } static void gdb_log_callback(void *priv, const char *file, unsigned line, const char *function, const char *string) { struct connection *connection = priv; struct gdb_connection *gdb_con = connection->priv; if (gdb_con->busy) { /* do not reply this using the O packet */ return; } gdb_output_con(connection, string); } static void gdb_sig_halted(struct connection *connection) { char sig_reply[4]; snprintf(sig_reply, 4, "T%2.2x", 2); gdb_put_packet(connection, sig_reply, 3); } static int gdb_input_inner(struct connection *connection) { /* Do not allocate this on the stack */ static char gdb_packet_buffer[GDB_BUFFER_SIZE]; struct target *target; char const *packet = gdb_packet_buffer; int packet_size; int retval; struct gdb_connection *gdb_con = connection->priv; static int extended_protocol; target = get_target_from_connection(connection); /* drain input buffer. If one of the packets fail, then an error * packet is replied, if applicable. * * This loop will terminate and the error code is returned. * * The calling fn will check if this error is something that * can be recovered from, or if the connection must be closed. * * If the error is recoverable, this fn is called again to * drain the rest of the buffer. */ do { packet_size = GDB_BUFFER_SIZE-1; retval = gdb_get_packet(connection, gdb_packet_buffer, &packet_size); if (retval != ERROR_OK) return retval; /* terminate with zero */ gdb_packet_buffer[packet_size] = '\0'; if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) { if (packet[0] == 'X') { /* binary packets spew junk into the debug log stream */ char buf[50]; int x; for (x = 0; (x < 49) && (packet[x] != ':'); x++) buf[x] = packet[x]; buf[x] = 0; LOG_DEBUG("received packet: '%s:'", buf); } else LOG_DEBUG("received packet: '%s'", packet); } if (packet_size > 0) { retval = ERROR_OK; switch (packet[0]) { case 'T': /* Is thread alive? */ gdb_thread_packet(connection, packet, packet_size); break; case 'H': /* Set current thread ( 'c' for step and continue, * 'g' for all other operations ) */ gdb_thread_packet(connection, packet, packet_size); break; case 'q': case 'Q': retval = gdb_thread_packet(connection, packet, packet_size); if (retval == GDB_THREAD_PACKET_NOT_CONSUMED) retval = gdb_query_packet(connection, packet, packet_size); break; case 'g': retval = gdb_get_registers_packet(connection, packet, packet_size); break; case 'G': retval = gdb_set_registers_packet(connection, packet, packet_size); break; case 'p': retval = gdb_get_register_packet(connection, packet, packet_size); break; case 'P': retval = gdb_set_register_packet(connection, packet, packet_size); break; case 'm': retval = gdb_read_memory_packet(connection, packet, packet_size); break; case 'M': retval = gdb_write_memory_packet(connection, packet, packet_size); break; case 'z': case 'Z': retval = gdb_breakpoint_watchpoint_packet(connection, packet, packet_size); break; case '?': gdb_last_signal_packet(connection, packet, packet_size); break; case 'c': case 's': { gdb_thread_packet(connection, packet, packet_size); log_add_callback(gdb_log_callback, connection); if (gdb_con->mem_write_error) { LOG_ERROR("Memory write failure!"); /* now that we have reported the memory write error, * we can clear the condition */ gdb_con->mem_write_error = false; } bool nostep = false; bool already_running = false; if (target->state == TARGET_RUNNING) { LOG_WARNING("WARNING! The target is already running. " "All changes GDB did to registers will be discarded! " "Waiting for target to halt."); already_running = true; } else if (target->state != TARGET_HALTED) { LOG_WARNING("The target is not in the halted nor running stated, " \ "stepi/continue ignored."); nostep = true; } else if ((packet[0] == 's') && gdb_con->sync) { /* Hmm..... when you issue a continue in GDB, then a "stepi" is * sent by GDB first to OpenOCD, thus defeating the check to * make only the single stepping have the sync feature... */ nostep = true; LOG_WARNING("stepi ignored. GDB will now fetch the register state " \ "from the target."); } gdb_con->sync = false; if (!already_running && nostep) { /* Either the target isn't in the halted state, then we can't * step/continue. This might be early setup, etc. * * Or we want to allow GDB to pick up a fresh set of * register values without modifying the target state. * */ gdb_sig_halted(connection); /* stop forwarding log packets! */ log_remove_callback(gdb_log_callback, connection); } else { /* We're running/stepping, in which case we can * forward log output until the target is halted */ gdb_con->frontend_state = TARGET_RUNNING; target_call_event_callbacks(target, TARGET_EVENT_GDB_START); if (!already_running) { /* Here we don't want packet processing to stop even if this fails, * so we use a local variable instead of retval. */ retval = gdb_step_continue_packet(connection, packet, packet_size); if (retval != ERROR_OK) { /* we'll never receive a halted * condition... issue a false one.. */ gdb_frontend_halted(target, connection); } } } } break; case 'v': retval = gdb_v_packet(connection, packet, packet_size); break; case 'D': retval = gdb_detach(connection); extended_protocol = 0; break; case 'X': retval = gdb_write_memory_binary_packet(connection, packet, packet_size); if (retval != ERROR_OK) return retval; break; case 'k': if (extended_protocol != 0) { gdb_con->attached = false; break; } gdb_put_packet(connection, "OK", 2); return ERROR_SERVER_REMOTE_CLOSED; case '!': /* handle extended remote protocol */ extended_protocol = 1; gdb_put_packet(connection, "OK", 2); break; case 'R': /* handle extended restart packet */ breakpoint_clear_target(target); watchpoint_clear_target(target); command_run_linef(connection->cmd_ctx, "ocd_gdb_restart %s", target_name(target)); /* set connection as attached after reset */ gdb_con->attached = true; /* info rtos parts */ gdb_thread_packet(connection, packet, packet_size); break; case 'j': /* packet supported only by smp target i.e cortex_a.c*/ /* handle smp packet replying coreid played to gbd */ gdb_read_smp_packet(connection, packet, packet_size); break; case 'J': /* packet supported only by smp target i.e cortex_a.c */ /* handle smp packet setting coreid to be played at next * resume to gdb */ gdb_write_smp_packet(connection, packet, packet_size); break; case 'F': /* File-I/O extension */ /* After gdb uses host-side syscall to complete target file * I/O, gdb sends host-side syscall return value to target * by 'F' packet. * The format of 'F' response packet is * Fretcode,errno,Ctrl-C flag;call-specific attachment */ gdb_con->frontend_state = TARGET_RUNNING; log_add_callback(gdb_log_callback, connection); gdb_fileio_response_packet(connection, packet, packet_size); break; default: /* ignore unknown packets */ LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]); gdb_put_packet(connection, NULL, 0); break; } /* if a packet handler returned an error, exit input loop */ if (retval != ERROR_OK) return retval; } if (gdb_con->ctrl_c) { if (target->state == TARGET_RUNNING) { struct target *t = target; if (target->rtos) target->rtos->gdb_target_for_threadid(connection, target->rtos->current_threadid, &t); retval = target_halt(t); if (retval == ERROR_OK) retval = target_poll(t); if (retval != ERROR_OK) target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT); gdb_con->ctrl_c = 0; } else { LOG_INFO("The target is not running when halt was requested, stopping GDB."); target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT); } } } while (gdb_con->buf_cnt > 0); return ERROR_OK; } static int gdb_input(struct connection *connection) { int retval = gdb_input_inner(connection); struct gdb_connection *gdb_con = connection->priv; if (retval == ERROR_SERVER_REMOTE_CLOSED) return retval; /* logging does not propagate the error, yet can set the gdb_con->closed flag */ if (gdb_con->closed) return ERROR_SERVER_REMOTE_CLOSED; /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */ return ERROR_OK; } static int gdb_target_start(struct target *target, const char *port) { struct gdb_service *gdb_service; int ret; gdb_service = malloc(sizeof(struct gdb_service)); if (NULL == gdb_service) return -ENOMEM; LOG_DEBUG("starting gdb server for %s on %s", target_name(target), port); gdb_service->target = target; gdb_service->core[0] = -1; gdb_service->core[1] = -1; target->gdb_service = gdb_service; ret = add_service("gdb", port, 1, &gdb_new_connection, &gdb_input, &gdb_connection_closed, gdb_service); /* initialialize all targets gdb service with the same pointer */ { struct target_list *head; struct target *curr; head = target->head; while (head != (struct target_list *)NULL) { curr = head->target; if (curr != target) curr->gdb_service = gdb_service; head = head->next; } } return ret; } static int gdb_target_add_one(struct target *target) { /* one gdb instance per smp list */ if ((target->smp) && (target->gdb_service)) return ERROR_OK; /* skip targets that cannot handle a gdb connections (e.g. mem_ap) */ if (!target_supports_gdb_connection(target)) { LOG_DEBUG("skip gdb server for target %s", target_name(target)); return ERROR_OK; } if (target->gdb_port_override) { if (strcmp(target->gdb_port_override, "disabled") == 0) { LOG_INFO("gdb port disabled"); return ERROR_OK; } return gdb_target_start(target, target->gdb_port_override); } if (strcmp(gdb_port, "disabled") == 0) { LOG_INFO("gdb port disabled"); return ERROR_OK; } int retval = gdb_target_start(target, gdb_port_next); if (retval == ERROR_OK) { /* save the port number so can be queried with * $target_name cget -gdb-port */ target->gdb_port_override = strdup(gdb_port_next); long portnumber; /* If we can parse the port number * then we increment the port number for the next target. */ char *end; portnumber = strtol(gdb_port_next, &end, 0); if (!*end) { if (parse_long(gdb_port_next, &portnumber) == ERROR_OK) { free(gdb_port_next); if (portnumber) { gdb_port_next = alloc_printf("%d", portnumber+1); } else { /* Don't increment if gdb_port is 0, since we're just * trying to allocate an unused port. */ gdb_port_next = strdup("0"); } } } } return retval; } int gdb_target_add_all(struct target *target) { if (NULL == target) { LOG_WARNING("gdb services need one or more targets defined"); return ERROR_OK; } while (NULL != target) { int retval = gdb_target_add_one(target); if (ERROR_OK != retval) return retval; target = target->next; } return ERROR_OK; } COMMAND_HANDLER(handle_gdb_sync_command) { if (CMD_ARGC != 0) return ERROR_COMMAND_SYNTAX_ERROR; if (current_gdb_connection == NULL) { command_print(CMD_CTX, "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\""); return ERROR_FAIL; } current_gdb_connection->sync = true; return ERROR_OK; } /* daemon configuration command gdb_port */ COMMAND_HANDLER(handle_gdb_port_command) { int retval = CALL_COMMAND_HANDLER(server_pipe_command, &gdb_port); if (ERROR_OK == retval) { free(gdb_port_next); gdb_port_next = strdup(gdb_port); } return retval; } COMMAND_HANDLER(handle_gdb_memory_map_command) { if (CMD_ARGC != 1) return ERROR_COMMAND_SYNTAX_ERROR; COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map); return ERROR_OK; } COMMAND_HANDLER(handle_gdb_flash_program_command) { if (CMD_ARGC != 1) return ERROR_COMMAND_SYNTAX_ERROR; COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program); return ERROR_OK; } COMMAND_HANDLER(handle_gdb_report_data_abort_command) { if (CMD_ARGC != 1) return ERROR_COMMAND_SYNTAX_ERROR; COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort); return ERROR_OK; } COMMAND_HANDLER(handle_gdb_report_register_access_error) { if (CMD_ARGC != 1) return ERROR_COMMAND_SYNTAX_ERROR; COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_register_access_error); return ERROR_OK; } /* gdb_breakpoint_override */ COMMAND_HANDLER(handle_gdb_breakpoint_override_command) { if (CMD_ARGC == 0) { /* nothing */ } else if (CMD_ARGC == 1) { gdb_breakpoint_override = 1; if (strcmp(CMD_ARGV[0], "hard") == 0) gdb_breakpoint_override_type = BKPT_HARD; else if (strcmp(CMD_ARGV[0], "soft") == 0) gdb_breakpoint_override_type = BKPT_SOFT; else if (strcmp(CMD_ARGV[0], "disable") == 0) gdb_breakpoint_override = 0; } else return ERROR_COMMAND_SYNTAX_ERROR; if (gdb_breakpoint_override) LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD) ? "hard" : "soft"); else LOG_USER("breakpoint type is not overridden"); return ERROR_OK; } COMMAND_HANDLER(handle_gdb_target_description_command) { if (CMD_ARGC != 1) return ERROR_COMMAND_SYNTAX_ERROR; COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_target_description); return ERROR_OK; } COMMAND_HANDLER(handle_gdb_save_tdesc_command) { char *tdesc; uint32_t tdesc_length; struct target *target = get_current_target(CMD_CTX); int retval = gdb_generate_target_description(target, &tdesc); if (retval != ERROR_OK) { LOG_ERROR("Unable to Generate Target Description"); return ERROR_FAIL; } tdesc_length = strlen(tdesc); struct fileio *fileio; size_t size_written; char *tdesc_filename = alloc_printf("%s.xml", target_type_name(target)); if (tdesc_filename == NULL) { retval = ERROR_FAIL; goto out; } retval = fileio_open(&fileio, tdesc_filename, FILEIO_WRITE, FILEIO_TEXT); if (retval != ERROR_OK) { LOG_ERROR("Can't open %s for writing", tdesc_filename); goto out; } retval = fileio_write(fileio, tdesc_length, tdesc, &size_written); fileio_close(fileio); if (retval != ERROR_OK) LOG_ERROR("Error while writing the tdesc file"); out: free(tdesc_filename); free(tdesc); return retval; } static const struct command_registration gdb_command_handlers[] = { { .name = "gdb_sync", .handler = handle_gdb_sync_command, .mode = COMMAND_ANY, .help = "next stepi will return immediately allowing " "GDB to fetch register state without affecting " "target state", .usage = "" }, { .name = "gdb_port", .handler = handle_gdb_port_command, .mode = COMMAND_ANY, .help = "Normally gdb listens to a TCP/IP port. Each subsequent GDB " "server listens for the next port number after the " "base port number specified. " "No arguments reports GDB port. \"pipe\" means listen to stdin " "output to stdout, an integer is base port number, \"disabled\" disables " "port. Any other string is are interpreted as named pipe to listen to. " "Output pipe is the same name as input pipe, but with 'o' appended.", .usage = "[port_num]", }, { .name = "gdb_memory_map", .handler = handle_gdb_memory_map_command, .mode = COMMAND_CONFIG, .help = "enable or disable memory map", .usage = "('enable'|'disable')" }, { .name = "gdb_flash_program", .handler = handle_gdb_flash_program_command, .mode = COMMAND_CONFIG, .help = "enable or disable flash program", .usage = "('enable'|'disable')" }, { .name = "gdb_report_data_abort", .handler = handle_gdb_report_data_abort_command, .mode = COMMAND_CONFIG, .help = "enable or disable reporting data aborts", .usage = "('enable'|'disable')" }, { .name = "gdb_report_register_access_error", .handler = handle_gdb_report_register_access_error, .mode = COMMAND_CONFIG, .help = "enable or disable reporting register access errors", .usage = "('enable'|'disable')" }, { .name = "gdb_breakpoint_override", .handler = handle_gdb_breakpoint_override_command, .mode = COMMAND_ANY, .help = "Display or specify type of breakpoint " "to be used by gdb 'break' commands.", .usage = "('hard'|'soft'|'disable')" }, { .name = "gdb_target_description", .handler = handle_gdb_target_description_command, .mode = COMMAND_CONFIG, .help = "enable or disable target description", .usage = "('enable'|'disable')" }, { .name = "gdb_save_tdesc", .handler = handle_gdb_save_tdesc_command, .mode = COMMAND_EXEC, .help = "Save the target description file", }, COMMAND_REGISTRATION_DONE }; int gdb_register_commands(struct command_context *cmd_ctx) { gdb_port = strdup("3333"); gdb_port_next = strdup("3333"); return register_commands(cmd_ctx, NULL, gdb_command_handlers); } void gdb_service_free(void) { free(gdb_port); free(gdb_port_next); }