/*************************************************************************** * Copyright (C) 2005 by Dominic Rath * * Dominic.Rath@gmx.de * * * * 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, write to the * * Free Software Foundation, Inc., * * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * ***************************************************************************/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "replacements.h" #include "gdb_server.h" #include "server.h" #include "log.h" #include "binarybuffer.h" #include "jtag.h" #include "breakpoints.h" #include "flash.h" #include "target_request.h" #include #include #include #include #if 0 #define _DEBUG_GDB_IO_ #endif static unsigned short gdb_port; enum gdb_detach_mode { GDB_DETACH_RESUME, GDB_DETACH_RESET, GDB_DETACH_HALT, GDB_DETACH_NOTHING }; /* target behaviour on gdb detach */ enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME; /* set if we are sending a memory map to gdb * via qXfer:memory-map:read packet */ int gdb_use_memory_map = 0; int gdb_flash_program = 0; int gdb_last_signal(target_t *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: ERROR("BUG: undefined debug reason"); exit(-1); } } int gdb_get_char(connection_t *connection, int* next_char) { gdb_connection_t *gdb_con = connection->priv; #ifdef _DEBUG_GDB_IO_ char *debug_buffer; #endif if (gdb_con->buf_cnt-- > 0) { *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_ DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char); #endif return ERROR_OK; } while ((gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE)) <= 0) { if (gdb_con->buf_cnt == 0) return ERROR_SERVER_REMOTE_CLOSED; #ifdef _WIN32 errno = WSAGetLastError(); switch(errno) { case WSAEWOULDBLOCK: usleep(1000); break; case WSAECONNABORTED: return ERROR_SERVER_REMOTE_CLOSED; case WSAECONNRESET: return ERROR_SERVER_REMOTE_CLOSED; default: ERROR("read: %d", errno); exit(-1); } #else switch(errno) { case EAGAIN: usleep(1000); break; case ECONNABORTED: return ERROR_SERVER_REMOTE_CLOSED; case ECONNRESET: return ERROR_SERVER_REMOTE_CLOSED; default: ERROR("read: %s", strerror(errno)); exit(-1); } #endif } #ifdef _DEBUG_GDB_IO_ debug_buffer = malloc(gdb_con->buf_cnt + 1); memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt); debug_buffer[gdb_con->buf_cnt] = 0; 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_ DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char); #endif return ERROR_OK; } int gdb_putback_char(connection_t *connection, int last_char) { gdb_connection_t *gdb_con = connection->priv; if (gdb_con->buf_p > gdb_con->buffer) { *(--gdb_con->buf_p) = last_char; gdb_con->buf_cnt++; } else { ERROR("BUG: couldn't put character back"); } return ERROR_OK; } int gdb_put_packet(connection_t *connection, char *buffer, int len) { int i; unsigned char my_checksum = 0; char checksum[3]; char *debug_buffer; int reply; int retval; gdb_connection_t *gdb_con = connection->priv; for (i = 0; i < len; i++) my_checksum += buffer[i]; while (1) { debug_buffer = malloc(len + 1); memcpy(debug_buffer, buffer, len); debug_buffer[len] = 0; DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum); free(debug_buffer); write_socket(connection->fd, "$", 1); if (len > 0) write_socket(connection->fd, buffer, len); write_socket(connection->fd, "#", 1); snprintf(checksum, 3, "%2.2x", my_checksum); write_socket(connection->fd, checksum, 2); if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK) return retval; if (reply == '+') break; else if (reply == '-') WARNING("negative reply, retrying"); else if (reply == 0x3) { gdb_con->ctrl_c = 1; if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK) return retval; if (reply == '+') break; else if (reply == '-') WARNING("negative reply, retrying"); else { ERROR("unknown character 0x%2.2x in reply, dropping connection", reply); return ERROR_SERVER_REMOTE_CLOSED; } } else { ERROR("unknown character 0x%2.2x in reply, dropping connection", reply); return ERROR_SERVER_REMOTE_CLOSED; } } return ERROR_OK; } int gdb_get_packet(connection_t *connection, char *buffer, int *len) { int character; int count = 0; int retval; char checksum[3]; unsigned char my_checksum = 0; gdb_connection_t *gdb_con = connection->priv; while (1) { do { if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; #ifdef _DEBUG_GDB_IO_ DEBUG("character: '%c'", character); #endif switch (character) { case '$': break; case '+': WARNING("acknowledgment received, but no packet pending"); break; case '-': WARNING("negative acknowledgment, but no packet pending"); break; case 0x3: gdb_con->ctrl_c = 1; *len = 0; return ERROR_OK; default: WARNING("ignoring character 0x%x", character); break; } } while (character != '$'); my_checksum = 0; do { if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; if (character == '#') break; if (character == '}') { /* data transmitted in binary mode (X packet) * uses 0x7d as escape character */ my_checksum += character & 0xff; if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; my_checksum += character & 0xff; buffer[count++] = (character ^ 0x20) & 0xff; } else { my_checksum += character & 0xff; buffer[count++] = character & 0xff; } if (count > *len) { ERROR("packet buffer too small"); return ERROR_GDB_BUFFER_TOO_SMALL; } } while (1); *len = count; if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; checksum[0] = character; if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; checksum[1] = character; checksum[2] = 0; if (my_checksum == strtoul(checksum, NULL, 16)) { write_socket(connection->fd, "+", 1); break; } WARNING("checksum error, requesting retransmission"); write_socket(connection->fd, "-", 1); } return ERROR_OK; } int gdb_output(struct command_context_s *context, char* line) { connection_t *connection = context->output_handler_priv; gdb_connection_t *gdb_connection = connection->priv; char *hex_buffer; int i, bin_size; /* check if output is enabled */ if (gdb_connection->output_disable) { return ERROR_OK; } bin_size = strlen(line); hex_buffer = malloc(bin_size*2 + 4); hex_buffer[0] = 'O'; for (i=0; igdb_program_script) { script = fopen(target->gdb_program_script, "r"); if (!script) { ERROR("couldn't open script file %s", target->gdb_program_script); return ERROR_OK; } INFO("executing gdb_program script '%s'", target->gdb_program_script); command_run_file(cmd_ctx, script, COMMAND_EXEC); fclose(script); jtag_execute_queue(); } return ERROR_OK; } int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv) { connection_t *connection = priv; gdb_connection_t *gdb_connection = connection->priv; char sig_reply[4]; int signal; switch (event) { case TARGET_EVENT_HALTED: if (gdb_connection->frontend_state == TARGET_RUNNING) { if (gdb_connection->ctrl_c) { signal = 0x2; gdb_connection->ctrl_c = 0; } else { signal = gdb_last_signal(target); } snprintf(sig_reply, 4, "T%2.2x", signal); gdb_put_packet(connection, sig_reply, 3); gdb_connection->frontend_state = TARGET_HALTED; } break; case TARGET_EVENT_RESUMED: if (gdb_connection->frontend_state == TARGET_HALTED) { gdb_connection->frontend_state = TARGET_RUNNING; } break; case TARGET_EVENT_GDB_PROGRAM: gdb_program_handler(target, event, connection->cmd_ctx); break; default: break; } return ERROR_OK; } int gdb_new_connection(connection_t *connection) { gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t)); gdb_service_t *gdb_service = connection->service->priv; int retval; int initial_ack; connection->priv = gdb_connection; /* 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->output_disable = 0; /* output goes through gdb connection */ command_set_output_handler(connection->cmd_ctx, gdb_output, connection); /* register callback to be informed about target events */ target_register_event_callback(gdb_target_callback_event_handler, connection); /* a gdb session just attached, put the target in halt mode */ if (((retval = gdb_service->target->type->halt(gdb_service->target)) != ERROR_OK) && (retval != ERROR_TARGET_ALREADY_HALTED)) { ERROR("error when trying to halt target"); exit(-1); } while (gdb_service->target->state != TARGET_HALTED) { gdb_service->target->type->poll(gdb_service->target); } /* remove the initial ACK from the incoming buffer */ if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK) return retval; if (initial_ack != '+') gdb_putback_char(connection, initial_ack); return ERROR_OK; } int gdb_connection_closed(connection_t *connection) { gdb_service_t *gdb_service = connection->service->priv; gdb_connection_t *gdb_connection = connection->priv; /* 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, gdb_service->target); if (connection->priv) { free(connection->priv); connection->priv = NULL; } else { ERROR("BUG: connection->priv == NULL"); } target_unregister_event_callback(gdb_target_callback_event_handler, connection); return ERROR_OK; } void gdb_send_error(connection_t *connection, u8 the_error) { char err[4]; snprintf(err, 4, "E%2.2X", the_error ); gdb_put_packet(connection, err, 3); } int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size) { char sig_reply[4]; int signal; signal = gdb_last_signal(target); snprintf(sig_reply, 4, "S%2.2x", signal); gdb_put_packet(connection, sig_reply, 3); return ERROR_OK; } void gdb_str_to_target(target_t *target, char *str, char *tstr) { int str_len = strlen(str); int i; if (str_len % 2) { ERROR("BUG: gdb value with uneven number of characters encountered: %s", str); exit(-1); } if (target->endianness == TARGET_LITTLE_ENDIAN) { for (i = 0; i < str_len; i+=2) { tstr[str_len - i - 1] = str[i + 1]; tstr[str_len - i - 2] = str[i]; } } else { for (i = 0; i < str_len; i++) { tstr[i] = str[i]; } } } void gdb_target_to_str(target_t *target, char *tstr, char *str) { int str_len = strlen(tstr); int i; if (str_len % 2) { ERROR("BUG: gdb value with uneven number of characters encountered"); exit(-1); } if (target->endianness == TARGET_LITTLE_ENDIAN) { for (i = 0; i < str_len; i+=2) { str[str_len - i - 1] = tstr[i + 1]; str[str_len - i - 2] = tstr[i]; } } else { for (i = 0; i < str_len; i++) { str[i] = tstr[i]; } } } int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size) { reg_t **reg_list; int reg_list_size; int retval; int reg_packet_size = 0; char *reg_packet; char *reg_packet_p; int i; DEBUG("-"); if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb requested registers but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; default: /* this is a bug condition - get_gdb_reg_list() may not return any other error */ ERROR("BUG: unexpected error returned by get_gdb_reg_list()"); exit(-1); } } for (i = 0; i < reg_list_size; i++) { reg_packet_size += reg_list[i]->size; } reg_packet = malloc(CEIL(reg_packet_size, 8) * 2); reg_packet_p = reg_packet; for (i = 0; i < reg_list_size; i++) { char *hex_buf = buf_to_str(reg_list[i]->value, reg_list[i]->size, 16); DEBUG("hex_buf: %s", hex_buf); gdb_str_to_target(target, hex_buf, reg_packet_p); reg_packet_p += CEIL(reg_list[i]->size, 8) * 2; free(hex_buf); } reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2); DEBUG("reg_packet: %s", reg_packet_p); free(reg_packet_p); gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2); free(reg_packet); free(reg_list); return ERROR_OK; } int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { int i; reg_t **reg_list; int reg_list_size; int retval; char *packet_p; DEBUG("-"); /* skip command character */ packet++; packet_size--; if (packet_size % 2) { WARNING("GDB set_registers packet with uneven characters received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb tried to registers but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; default: /* this is a bug condition - get_gdb_reg_list() may not return any other error */ ERROR("BUG: unexpected error returned by get_gdb_reg_list()"); exit(-1); } } packet_p = packet; for (i = 0; i < reg_list_size; i++) { u8 *bin_buf; char *hex_buf; reg_arch_type_t *arch_type; /* convert from GDB-string (target-endian) to hex-string (big-endian) */ hex_buf = malloc(CEIL(reg_list[i]->size, 8) * 2); gdb_target_to_str(target, packet_p, hex_buf); /* convert hex-string to binary buffer */ bin_buf = malloc(CEIL(reg_list[i]->size, 8)); str_to_buf(hex_buf, CEIL(reg_list[i]->size, 8) * 2, bin_buf, reg_list[i]->size, 16); /* get register arch_type, and call set method */ arch_type = register_get_arch_type(reg_list[i]->arch_type); if (arch_type == NULL) { ERROR("BUG: encountered unregistered arch type"); exit(-1); } arch_type->set(reg_list[i], bin_buf); /* advance packet pointer */ packet_p += (CEIL(reg_list[i]->size, 8) * 2); free(bin_buf); free(hex_buf); } /* free reg_t *reg_list[] array allocated by get_gdb_reg_list */ free(reg_list); gdb_put_packet(connection, "OK", 2); return ERROR_OK; } int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char *reg_packet; int reg_num = strtoul(packet + 1, NULL, 16); reg_t **reg_list; int reg_list_size; int retval; char *hex_buf; DEBUG("-"); if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb requested registers but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; default: /* this is a bug condition - get_gdb_reg_list() may not return any other error */ ERROR("BUG: unexpected error returned by get_gdb_reg_list()"); exit(-1); } } if (reg_list_size <= reg_num) { ERROR("gdb requested a non-existing register"); exit(-1); } reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2); hex_buf = buf_to_str(reg_list[reg_num]->value, reg_list[reg_num]->size, 16); gdb_str_to_target(target, hex_buf, reg_packet); gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2); free(reg_list); free(reg_packet); free(hex_buf); return ERROR_OK; } int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char *separator; char *hex_buf; u8 *bin_buf; int reg_num = strtoul(packet + 1, &separator, 16); reg_t **reg_list; int reg_list_size; int retval; reg_arch_type_t *arch_type; DEBUG("-"); if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb tried to set a register but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; default: /* this is a bug condition - get_gdb_reg_list() may not return any other error */ ERROR("BUG: unexpected error returned by get_gdb_reg_list()"); exit(-1); } } if (reg_list_size < reg_num) { ERROR("gdb requested a non-existing register"); return ERROR_SERVER_REMOTE_CLOSED; } if (*separator != '=') { 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) */ hex_buf = malloc(CEIL(reg_list[reg_num]->size, 8) * 2); gdb_target_to_str(target, separator + 1, hex_buf); /* convert hex-string to binary buffer */ bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8)); str_to_buf(hex_buf, CEIL(reg_list[reg_num]->size, 8) * 2, bin_buf, reg_list[reg_num]->size, 16); /* get register arch_type, and call set method */ arch_type = register_get_arch_type(reg_list[reg_num]->arch_type); if (arch_type == NULL) { ERROR("BUG: encountered unregistered arch type"); exit(-1); } arch_type->set(reg_list[reg_num], bin_buf); gdb_put_packet(connection, "OK", 2); free(bin_buf); free(hex_buf); free(reg_list); return ERROR_OK; } int gdb_memory_packet_error(connection_t *connection, int retval) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb tried to read memory but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; break; case ERROR_TARGET_DATA_ABORT: gdb_send_error(connection, EIO); break; case ERROR_TARGET_TRANSLATION_FAULT: gdb_send_error(connection, EFAULT); break; case ERROR_TARGET_UNALIGNED_ACCESS: gdb_send_error(connection, EFAULT); break; default: ERROR("BUG: unexpected error %i", retval); exit(-1); } return ERROR_OK; } int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char *separator; u32 addr = 0; u32 len = 0; u8 *buffer; char *hex_buffer; int i; int retval; /* skip command character */ packet++; addr = strtoul(packet, &separator, 16); if (*separator != ',') { ERROR("incomplete read memory packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator+1, NULL, 16); buffer = malloc(len); DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len); switch (len) { case 4: if ((addr % 4) == 0) retval = target->type->read_memory(target, addr, 4, 1, buffer); else retval = target->type->read_memory(target, addr, 1, len, buffer); break; case 2: if ((addr % 2) == 0) retval = target->type->read_memory(target, addr, 2, 1, buffer); else retval = target->type->read_memory(target, addr, 1, len, buffer); break; default: if (((addr % 4) == 0) && ((len % 4) == 0)) retval = target->type->read_memory(target, addr, 4, len / 4, buffer); else retval = target->type->read_memory(target, addr, 1, len, buffer); } if (retval == ERROR_OK) { hex_buffer = malloc(len * 2 + 1); for (i=0; itype->write_memory(target, addr, 4, 1, buffer); else retval = target->type->write_memory(target, addr, 1, len, buffer); break; case 2: if ((addr % 2) == 0) retval = target->type->write_memory(target, addr, 2, 1, buffer); else retval = target->type->write_memory(target, addr, 1, len, buffer); break; case 3: case 1: retval = target->type->write_memory(target, addr, 1, len, buffer); break; /* handle bulk writes */ default: retval = target_write_buffer(target, addr, len, buffer); break; } if (retval == ERROR_OK) { gdb_put_packet(connection, "OK", 2); } else { if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) return retval; } free(buffer); return ERROR_OK; } int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char *separator; u32 addr = 0; u32 len = 0; u8 *buffer; int retval; /* skip command character */ packet++; addr = strtoul(packet, &separator, 16); if (*separator != ',') { ERROR("incomplete write memory binary packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } len = strtoul(separator+1, &separator, 16); if (*(separator++) != ':') { ERROR("incomplete write memory binary packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } retval = ERROR_OK; if( len ) { buffer = malloc(len); DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len); memcpy( buffer, separator, len ); switch (len) { case 4: if ((addr % 4) == 0) retval = target->type->write_memory(target, addr, 4, 1, buffer); else retval = target->type->write_memory(target, addr, 1, len, buffer); break; case 2: if ((addr % 2) == 0) retval = target->type->write_memory(target, addr, 2, 1, buffer); else retval = target->type->write_memory(target, addr, 1, len, buffer); break; case 3: case 1: retval = target->type->write_memory(target, addr, 1, len, buffer); break; default: retval = target_write_buffer(target, addr, len, buffer); break; } free(buffer); } if (retval == ERROR_OK) { gdb_put_packet(connection, "OK", 2); } else { if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) return retval; } return ERROR_OK; } void gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { int current = 0; u32 address = 0x0; DEBUG("-"); if (packet_size > 1) { packet[packet_size] = 0; address = strtoul(packet + 1, NULL, 16); } else { current = 1; } if (packet[0] == 'c') { DEBUG("continue"); target->type->resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */ } else if (packet[0] == 's') { DEBUG("step"); target->type->step(target, current, address, 0); /* step at current or address, don't handle breakpoints */ } } int gdb_bp_wp_packet_error(connection_t *connection, int retval) { switch (retval) { case ERROR_TARGET_NOT_HALTED: ERROR("gdb tried to set a breakpoint but we're not halted, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; break; case ERROR_TARGET_RESOURCE_NOT_AVAILABLE: gdb_send_error(connection, EBUSY); break; default: ERROR("BUG: unexpected error %i", retval); exit(-1); } return ERROR_OK; } int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { int type; enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */; enum watchpoint_rw wp_type; u32 address; u32 size; char *separator; int retval; 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; if (*separator != ',') { ERROR("incomplete breakpoint/watchpoint packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } address = strtoul(separator+1, &separator, 16); if (*separator != ',') { 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') { if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK) { if ((retval = gdb_bp_wp_packet_error(connection, 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') { if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK) { if ((retval = gdb_bp_wp_packet_error(connection, 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 XML and allocate more space as needed */ 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; *xml = realloc(*xml, *size); if (*xml == NULL) { *retval = 1; 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 *buf, char **annex, int *ofs, unsigned int *len) { char *separator; /* Extract and NUL-terminate the annex. */ *annex = buf; while (*buf && *buf != ':') buf++; if (*buf == '\0') return -1; *buf++ = 0; /* After the read marker and annex, qXfer looks like a * traditional 'm' packet. */ *ofs = strtoul(buf, &separator, 16); if (*separator != ',') return -1; *len = strtoul(separator+1, NULL, 16); return 0; } int gdb_query_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char buffer[GDB_BUFFER_SIZE]; command_context_t *cmd_ctx = connection->cmd_ctx; if (strstr(packet, "qRcmd,")) { if (packet_size > 6) { char *cmd; int i; cmd = malloc((packet_size - 6)/2 + 1); for (i=0; i < (packet_size - 6)/2; i++) { u32 tmp; sscanf(packet + 6 + 2*i, "%2x", &tmp); cmd[i] = tmp; } cmd[(packet_size - 6)/2] = 0x0; command_run_line(cmd_ctx, cmd); free(cmd); } gdb_put_packet(connection, "OK", 2); return ERROR_OK; } else if (strstr(packet, "qCRC:")) { if (packet_size > 5) { int retval; u8 gdb_reply[10]; char *separator; u32 checksum; u32 addr = 0; u32 len = 0; /* skip command character */ packet += 5; addr = strtoul(packet, &separator, 16); if (*separator != ',') { 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%8.8x", checksum); gdb_put_packet(connection, gdb_reply, 9); } else { if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) return retval; } return ERROR_OK; } } else if (strstr(packet, "qSupported")) { /* we currently support packet size and qXfer:memory-map:read (if enabled) * disable qXfer:features:read for the moment */ sprintf(buffer, "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-", (GDB_BUFFER_SIZE - 1), gdb_use_memory_map == 1 ? '+' : '-'); gdb_put_packet(connection, buffer, strlen(buffer)); return ERROR_OK; } else if (strstr(packet, "qXfer:memory-map:read::")) { /* 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. */ flash_bank_t *p; char *xml = NULL; int size = 0; int pos = 0; int retval = ERROR_OK; int offset; int length; char *separator; /* skip command character */ packet += 23; offset = strtoul(packet, &separator, 16); length = strtoul(separator + 1, &separator, 16); xml_printf(&retval, &xml, &pos, &size, "\n"); int i = 0; for (;;) { p = get_flash_bank_by_num(i); if (p == NULL) break; xml_printf(&retval, &xml, &pos, &size, "\n" \ "0x%x\n" \ "\n", \ p->base, p->size, p->size/p->num_sectors); i++; } xml_printf(&retval, &xml, &pos, &size, "\n"); if (retval != ERROR_OK) { gdb_send_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; } else if (strstr(packet, "qXfer:features:read:")) { char *xml = NULL; int size = 0; int pos = 0; int retval = ERROR_OK; int offset; int length; char *annex; /* skip command character */ packet += 20; if (decode_xfer_read( packet, &annex, &offset, &length ) < 0) { gdb_send_error(connection, 01); return ERROR_OK; } if (strcmp(annex, "target.xml") != 0) { gdb_send_error(connection, 01); return ERROR_OK; } xml_printf(&retval, &xml, &pos, &size, \ "l\narm\n\n"); if (retval != ERROR_OK) { gdb_send_error(connection, retval); return retval; } gdb_put_packet(connection, xml, strlen(xml) + 1); free(xml); return ERROR_OK; } gdb_put_packet(connection, "", 0); return ERROR_OK; } int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { gdb_connection_t *gdb_connection = connection->priv; gdb_service_t *gdb_service = connection->service->priv; int result; /* if flash programming disabled - send a empty reply */ if (gdb_flash_program == 0) { gdb_put_packet(connection, "", 0); return ERROR_OK; } if (strstr(packet, "vFlashErase:")) { unsigned long addr; unsigned long length; char *parse = packet + 12; if (*parse == '\0') { ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } addr = strtoul(parse, &parse, 16); if (*(parse++) != ',' || *parse == '\0') { ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } length = strtoul(parse, &parse, 16); if (*parse != '\0') { ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } /* disable gdb output while programming */ gdb_connection->output_disable = 1; /* 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(gdb_service->target, TARGET_EVENT_GDB_PROGRAM); /* perform erase */ if ((result = flash_erase(gdb_service->target, addr, length)) != 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); ERROR("flash_erase returned %i", result); } else gdb_put_packet(connection, "OK", 2); /* reenable gdb output */ gdb_connection->output_disable = 0; return ERROR_OK; } if (strstr(packet, "vFlashWrite:")) { unsigned long addr; unsigned long length; char *parse = packet + 12; if (*parse == '\0') { ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } addr = strtoul(parse, &parse, 16); if (*(parse++) != ':') { ERROR("incomplete vFlashErase packet received, dropping connection"); return ERROR_SERVER_REMOTE_CLOSED; } length = packet_size - (parse - packet); /* disable gdb output while programming */ gdb_connection->output_disable = 1; /* create a new image if there isn't already one */ if (gdb_connection->vflash_image == NULL) { gdb_connection->vflash_image = malloc(sizeof(image_t)); image_open(gdb_connection->vflash_image, "", "build"); } /* create new section with content from packet buffer */ image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (u8*)parse); gdb_put_packet(connection, "OK", 2); /* reenable gdb output */ gdb_connection->output_disable = 0; return ERROR_OK; } if (!strcmp(packet, "vFlashDone")) { u32 written; char *error_str; /* disable gdb output while programming */ gdb_connection->output_disable = 1; /* process the flashing buffer */ if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, &error_str, NULL, 0)) != ERROR_OK) { if (result == ERROR_FLASH_DST_OUT_OF_BANK) gdb_put_packet(connection, "E.memtype", 9); else gdb_send_error(connection, EIO); if (error_str) { ERROR("flash writing failed: %s", error_str); free(error_str); } } else { DEBUG("wrote %u bytes from vFlash image to flash", written); gdb_put_packet(connection, "OK", 2); } image_close(gdb_connection->vflash_image); free(gdb_connection->vflash_image); gdb_connection->vflash_image = NULL; /* reenable gdb output */ gdb_connection->output_disable = 0; return ERROR_OK; } gdb_put_packet(connection, "", 0); return ERROR_OK; } int gdb_detach(connection_t *connection, target_t *target) { switch( detach_mode ) { case GDB_DETACH_RESUME: target->type->resume(target, 1, 0, 1, 0); break; case GDB_DETACH_RESET: target_process_reset(connection->cmd_ctx); break; case GDB_DETACH_HALT: target->type->halt(target); break; case GDB_DETACH_NOTHING: break; } gdb_put_packet(connection, "OK", 2); return ERROR_OK; } int gdb_input(connection_t *connection) { gdb_service_t *gdb_service = connection->service->priv; target_t *target = gdb_service->target; char packet[GDB_BUFFER_SIZE]; int packet_size; int retval; gdb_connection_t *gdb_con = connection->priv; /* drain input buffer */ do { packet_size = GDB_BUFFER_SIZE-1; if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK) { switch (retval) { case ERROR_GDB_BUFFER_TOO_SMALL: ERROR("BUG: buffer supplied for gdb packet was too small"); exit(-1); case ERROR_SERVER_REMOTE_CLOSED: return ERROR_SERVER_REMOTE_CLOSED; default: ERROR("BUG: unexpected error"); exit(-1); } } /* terminate with zero */ packet[packet_size] = 0; DEBUG("received packet: '%s'", packet); if (packet_size > 0) { retval = ERROR_OK; switch (packet[0]) { case 'H': /* Hct... -- set thread * we don't have threads, send empty reply */ gdb_put_packet(connection, NULL, 0); break; case 'q': retval = gdb_query_packet(connection, target, packet, packet_size); break; case 'g': retval = gdb_get_registers_packet(connection, target, packet, packet_size); break; case 'G': retval = gdb_set_registers_packet(connection, target, packet, packet_size); break; case 'p': retval = gdb_get_register_packet(connection, target, packet, packet_size); break; case 'P': retval = gdb_set_register_packet(connection, target, packet, packet_size); break; case 'm': retval = gdb_read_memory_packet(connection, target, packet, packet_size); break; case 'M': retval = gdb_write_memory_packet(connection, target, packet, packet_size); break; case 'z': case 'Z': retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size); break; case '?': gdb_last_signal_packet(connection, target, packet, packet_size); break; case 'c': case 's': gdb_step_continue_packet(connection, target, packet, packet_size); break; case 'v': retval = gdb_v_packet(connection, target, packet, packet_size); break; case 'D': retval = gdb_detach(connection, target); break; case 'X': if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK) return retval; break; case 'k': gdb_put_packet(connection, "OK", 2); return ERROR_SERVER_REMOTE_CLOSED; default: /* ignore unkown packets */ 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) { target->type->halt(target); gdb_con->ctrl_c = 0; } } } while (gdb_con->buf_cnt > 0); return ERROR_OK; } int gdb_init() { gdb_service_t *gdb_service; target_t *target = targets; int i = 0; if (!target) { WARNING("no gdb ports allocated as no target has been specified"); return ERROR_OK; } if (gdb_port == 0) { WARNING("no gdb port specified, using default port 3333"); gdb_port = 3333; } while (target) { char service_name[8]; snprintf(service_name, 8, "gdb-%2.2i", i); gdb_service = malloc(sizeof(gdb_service_t)); gdb_service->target = target; add_service("gdb", CONNECTION_GDB, gdb_port + i, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service); DEBUG("gdb service for target %s at port %i", target->type->name, gdb_port + i); i++; target = target->next; } return ERROR_OK; } /* daemon configuration command gdb_port */ int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) { if (argc == 0) return ERROR_OK; /* only if the port wasn't overwritten by cmdline */ if (gdb_port == 0) gdb_port = strtoul(args[0], NULL, 0); return ERROR_OK; } int handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) { if (argc == 1) { if (strcmp(args[0], "resume") == 0) { detach_mode = GDB_DETACH_RESUME; return ERROR_OK; } else if (strcmp(args[0], "reset") == 0) { detach_mode = GDB_DETACH_RESET; return ERROR_OK; } else if (strcmp(args[0], "halt") == 0) { detach_mode = GDB_DETACH_HALT; return ERROR_OK; } else if (strcmp(args[0], "nothing") == 0) { detach_mode = GDB_DETACH_NOTHING; return ERROR_OK; } } WARNING("invalid gdb_detach configuration directive: %s", args[0]); return ERROR_OK; } int handle_gdb_memory_map_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) { if (argc == 1) { if (strcmp(args[0], "enable") == 0) { gdb_use_memory_map = 1; return ERROR_OK; } else if (strcmp(args[0], "disable") == 0) { gdb_use_memory_map = 0; return ERROR_OK; } } WARNING("invalid gdb_memory_map configuration directive: %s", args[0]); return ERROR_OK; } int handle_gdb_flash_program_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) { if (argc == 1) { if (strcmp(args[0], "enable") == 0) { gdb_flash_program = 1; return ERROR_OK; } else if (strcmp(args[0], "disable") == 0) { gdb_flash_program = 0; return ERROR_OK; } } WARNING("invalid gdb_memory_map configuration directive: %s", args[0]); return ERROR_OK; } int gdb_register_commands(command_context_t *command_context) { register_command(command_context, NULL, "gdb_port", handle_gdb_port_command, COMMAND_CONFIG, ""); register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command, COMMAND_CONFIG, ""); register_command(command_context, NULL, "gdb_memory_map", handle_gdb_memory_map_command, COMMAND_CONFIG, ""); register_command(command_context, NULL, "gdb_flash_program", handle_gdb_flash_program_command, COMMAND_CONFIG, ""); return ERROR_OK; } id='n1159' href='#n1159'>1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763