X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fserver%2Fgdb_server.c;h=74722e108e99b13a5875d2d6f237544f8ed6a2e5;hb=f955b90d28874dc238a03178503a804b3c38582a;hp=74928c876853d56351ccb815161f9567778488e9;hpb=ce8768f46345e3f88ca6f8f0b88603d79e22d89a;p=fw%2Fopenocd diff --git a/src/server/gdb_server.c b/src/server/gdb_server.c index 74928c876..74722e108 100644 --- a/src/server/gdb_server.c +++ b/src/server/gdb_server.c @@ -28,11 +28,12 @@ #include "server.h" #include "log.h" #include "binarybuffer.h" +#include "jtag.h" #include "breakpoints.h" #include "flash.h" #include "target_request.h" +#include "configuration.h" -#define __USE_GNU #include #include #include @@ -43,6 +44,10 @@ #endif static unsigned short gdb_port; +static const char *DIGITS = "0123456789abcdef"; + +static void gdb_log_callback(void *priv, const char *file, int line, + const char *function, const char *string); enum gdb_detach_mode { @@ -52,8 +57,18 @@ enum gdb_detach_mode 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; + +/* 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 */ +int gdb_report_data_abort = 0; + int gdb_last_signal(target_t *target) { switch (target->debug_reason) @@ -77,7 +92,10 @@ int gdb_last_signal(target_t *target) 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) { @@ -94,10 +112,38 @@ int gdb_get_char(connection_t *connection, int* next_char) return ERROR_OK; } - while ((gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE)) <= 0) + for (;;) { +#ifndef _WIN32 + /* 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; + + FD_ZERO(&read_fds); + FD_SET(connection->fd, &read_fds); + + tv.tv_sec = 1; + tv.tv_usec = 0; + if (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 + */ + return ERROR_GDB_TIMEOUT; + } +#endif + 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 = 1; return ERROR_SERVER_REMOTE_CLOSED; + } #ifdef _WIN32 errno = WSAGetLastError(); @@ -109,6 +155,8 @@ int gdb_get_char(connection_t *connection, int* next_char) break; case WSAECONNABORTED: return ERROR_SERVER_REMOTE_CLOSED; + case WSAECONNRESET: + return ERROR_SERVER_REMOTE_CLOSED; default: ERROR("read: %d", errno); exit(-1); @@ -125,16 +173,18 @@ int gdb_get_char(connection_t *connection, int* next_char) return ERROR_SERVER_REMOTE_CLOSED; default: ERROR("read: %s", strerror(errno)); - exit(-1); + return ERROR_SERVER_REMOTE_CLOSED; } #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--; @@ -142,7 +192,7 @@ int gdb_get_char(connection_t *connection, int* next_char) if (gdb_con->buf_cnt > 0) connection->input_pending = 1; else - connection->input_pending = 0; + connection->input_pending = 0; #ifdef _DEBUG_GDB_IO_ DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char); #endif @@ -161,18 +211,36 @@ int gdb_putback_char(connection_t *connection, int last_char) } else { - ERROR("BUG: couldn't put character back"); + ERROR("BUG: couldn't put character back"); } return ERROR_OK; } -int gdb_put_packet(connection_t *connection, char *buffer, int len) +/* 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! */ +int gdb_write(connection_t *connection, void *data, int len) +{ + gdb_connection_t *gdb_con = connection->priv; + if (gdb_con->closed) + return ERROR_SERVER_REMOTE_CLOSED; + + if (write_socket(connection->fd, data, len) == len) + { + return ERROR_OK; + } + gdb_con->closed = 1; + return ERROR_SERVER_REMOTE_CLOSED; +} + +int gdb_put_packet_inner(connection_t *connection, char *buffer, int len) { int i; unsigned char my_checksum = 0; - char checksum[3]; +#ifdef _DEBUG_GDB_IO_ char *debug_buffer; +#endif int reply; int retval; gdb_connection_t *gdb_con = connection->priv; @@ -182,28 +250,62 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len) while (1) { +#ifdef _DEBUG_GDB_IO_ 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); +#endif +#if 0 + char checksum[3]; + gdb_write(connection, "$", 1); if (len > 0) - write_socket(connection->fd, buffer, len); - write_socket(connection->fd, "#", 1); + gdb_write(connection, buffer, len); + gdb_write(connection, "#", 1); snprintf(checksum, 3, "%2.2x", my_checksum); - write_socket(connection->fd, checksum, 2); + gdb_write(connection, checksum, 2); +#else + void *allocated = NULL; + char stackAlloc[1024]; + char *t = stackAlloc; + int totalLen = 1 + len + 1 + 2; + if (totalLen > sizeof(stackAlloc)) + { + allocated = malloc(totalLen); + t = allocated; + if (allocated == NULL) + { + ERROR("Ran out of memory trying to reply packet %d\n", totalLen); + exit(-1); + } + } + t[0] = '$'; + memcpy(t + 1, buffer, len); + t[1 + len] = '#'; + t[1 + len + 1] = DIGITS[(my_checksum >> 4) & 0xf]; + t[1 + len + 2] = DIGITS[my_checksum & 0xf]; + + gdb_write(connection, t, totalLen); + if (allocated) + { + free(allocated); + } +#endif if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK) return retval; if (reply == '+') break; else if (reply == '-') + { + /* Stop sending output packets for now */ + log_remove_callback(gdb_log_callback, connection); WARNING("negative reply, retrying"); + } else if (reply == 0x3) { gdb_con->ctrl_c = 1; @@ -212,7 +314,11 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len) if (reply == '+') break; else if (reply == '-') + { + /* Stop sending output packets for now */ + log_remove_callback(gdb_log_callback, connection); WARNING("negative reply, retrying"); + } else { ERROR("unknown character 0x%2.2x in reply, dropping connection", reply); @@ -225,11 +331,22 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len) return ERROR_SERVER_REMOTE_CLOSED; } } + if (gdb_con->closed) + return ERROR_SERVER_REMOTE_CLOSED; return ERROR_OK; } -int gdb_get_packet(connection_t *connection, char *buffer, int *len) +int gdb_put_packet(connection_t *connection, char *buffer, int len) +{ + gdb_connection_t *gdb_con = connection->priv; + gdb_con->busy = 1; + int retval = gdb_put_packet_inner(connection, buffer, len); + gdb_con->busy = 0; + return retval; +} + +int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len) { int character; int count = 0; @@ -245,7 +362,9 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len) if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; +#ifdef _DEBUG_GDB_IO_ DEBUG("character: '%c'", character); +#endif switch (character) { @@ -269,12 +388,69 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len) my_checksum = 0; - do + count = 0; + gdb_connection_t *gdb_con = connection->priv; + 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 ((gdb_con->buf_cnt > 2) && ((gdb_con->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 = gdb_con->buf_p; + int run = gdb_con->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; + } + } + gdb_con->buf_p += i; + gdb_con->buf_cnt -= i; + if (done) + break; + } + if (count > *len) + { + ERROR("packet buffer too small"); + return ERROR_GDB_BUFFER_TOO_SMALL; + } + if ((retval = gdb_get_char(connection, &character)) != ERROR_OK) return retval; - if (character == '#') break; + if (character == '#') + break; if (character == '}') { @@ -292,12 +468,7 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len) buffer[count++] = character & 0xff; } - if (count > *len) - { - ERROR("packet buffer too small"); - return ERROR_GDB_BUFFER_TOO_SMALL; - } - } while (1); + } *len = count; @@ -311,40 +482,81 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len) if (my_checksum == strtoul(checksum, NULL, 16)) { - write_socket(connection->fd, "+", 1); + gdb_write(connection, "+", 1); break; } WARNING("checksum error, requesting retransmission"); - write_socket(connection->fd, "-", 1); + gdb_write(connection, "-", 1); } + if (gdb_con->closed) + return ERROR_SERVER_REMOTE_CLOSED; return ERROR_OK; } -int gdb_output(struct command_context_s *context, char* line) +int gdb_get_packet(connection_t *connection, char *buffer, int *len) +{ + gdb_connection_t *gdb_con = connection->priv; + gdb_con->busy = 1; + int retval = gdb_get_packet_inner(connection, buffer, len); + gdb_con->busy = 0; + return retval; +} + +int gdb_output_con(connection_t *connection, const char* line) { - connection_t *connection = context->output_handler_priv; char *hex_buffer; int i, bin_size; bin_size = strlen(line); - hex_buffer = malloc(bin_size*2 + 4); + hex_buffer = malloc(bin_size*2 + 2); + if (hex_buffer == NULL) + return ERROR_GDB_BUFFER_TOO_SMALL; hex_buffer[0] = 'O'; for (i=0; igdb_program_script) + { + script = open_file_from_path(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; @@ -355,8 +567,20 @@ int gdb_target_callback_event_handler(struct target_s *target, enum target_event switch (event) { case TARGET_EVENT_HALTED: + /* In the GDB protocol when we are stepping or coninuing 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); + if (gdb_connection->ctrl_c) { signal = 0x2; @@ -372,11 +596,8 @@ int gdb_target_callback_event_handler(struct target_s *target, enum target_event gdb_connection->frontend_state = TARGET_HALTED; } break; - case TARGET_EVENT_RESUMED: - if (gdb_connection->frontend_state == TARGET_HALTED) - { - gdb_connection->frontend_state = TARGET_RUNNING; - } + case TARGET_EVENT_GDB_PROGRAM: + gdb_program_handler(target, event, connection->cmd_ctx); break; default: break; @@ -385,6 +606,7 @@ int gdb_target_callback_event_handler(struct target_s *target, enum target_event return ERROR_OK; } + int gdb_new_connection(connection_t *connection) { gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t)); @@ -400,25 +622,25 @@ int gdb_new_connection(connection_t *connection) gdb_connection->ctrl_c = 0; gdb_connection->frontend_state = TARGET_HALTED; gdb_connection->vflash_image = NULL; + gdb_connection->closed = 0; + gdb_connection->busy = 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); + 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); + ERROR("error(%d) when trying to halt target, falling back to \"reset halt\"", retval); + command_run_line(connection->cmd_ctx, "reset halt"); } - while (gdb_service->target->state != TARGET_HALTED) - { - gdb_service->target->type->poll(gdb_service->target); - } + /* This will time out after 1 second */ + command_run_line(connection->cmd_ctx, "wait_halt 1"); /* remove the initial ACK from the incoming buffer */ if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK) @@ -445,13 +667,19 @@ int gdb_connection_closed(connection_t *connection) /* 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); + log_remove_callback(gdb_log_callback, connection); return ERROR_OK; } @@ -476,32 +704,34 @@ int gdb_last_signal_packet(connection_t *connection, target_t *target, char* pac return ERROR_OK; } -void gdb_str_to_target(target_t *target, char *str, char *tstr) +/* Convert register to string of bits. NB! The # of bits in the + * register might be non-divisible by 8(a byte), in which + * case an entire byte is shown. */ +void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg) { - 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); - } + u8 *buf; + int buf_len; + buf = reg->value; + buf_len = CEIL(reg->size, 8); if (target->endianness == TARGET_LITTLE_ENDIAN) { - for (i = 0; i < str_len; i+=2) + for (i = 0; i < buf_len; i++) { - tstr[str_len - i - 1] = str[i + 1]; - tstr[str_len - i - 2] = str[i]; + tstr[i*2] = DIGITS[(buf[i]>>4) & 0xf]; + tstr[i*2+1] = DIGITS[buf[i]&0xf]; } } else { - for (i = 0; i < str_len; i++) + for (i = 0; i < buf_len; i++) { - tstr[i] = str[i]; + tstr[(buf_len-1-i)*2] = DIGITS[(buf[i]>>4)&0xf]; + tstr[(buf_len-1-i)*2+1] = DIGITS[buf[i]&0xf]; } - } + } } void gdb_target_to_str(target_t *target, char *tstr, char *str) @@ -529,7 +759,7 @@ void gdb_target_to_str(target_t *target, char *tstr, char *str) { str[i] = tstr[i]; } - } + } } int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size) @@ -542,7 +772,9 @@ int gdb_get_registers_packet(connection_t *connection, target_t *target, char* p char *reg_packet_p; int i; +#ifdef _DEBUG_GDB_IO_ DEBUG("-"); +#endif if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { @@ -568,16 +800,18 @@ int gdb_get_registers_packet(connection_t *connection, target_t *target, char* p 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); + gdb_str_to_target(target, reg_packet_p, reg_list[i]); 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); +#ifdef _DEBUG_GDB_IO_ + { + char *reg_packet_p; + reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2); + DEBUG("reg_packet: %s", reg_packet_p); + free(reg_packet_p); + } +#endif gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2); free(reg_packet); @@ -595,7 +829,9 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p int retval; char *packet_p; +#ifdef _DEBUG_GDB_IO_ DEBUG("-"); +#endif /* skip command character */ packet++; @@ -636,7 +872,7 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p 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 */ + /* get register arch_type, and call set method */ arch_type = register_get_arch_type(reg_list[i]->arch_type); if (arch_type == NULL) { @@ -645,14 +881,14 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p } arch_type->set(reg_list[i], bin_buf); - /* advance packet pointer */ + /* 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_t *reg_list[] array allocated by get_gdb_reg_list */ free(reg_list); gdb_put_packet(connection, "OK", 2); @@ -667,9 +903,10 @@ int gdb_get_register_packet(connection_t *connection, target_t *target, char *pa reg_t **reg_list; int reg_list_size; int retval; - char *hex_buf; +#ifdef _DEBUG_GDB_IO_ DEBUG("-"); +#endif if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK) { @@ -693,15 +930,12 @@ int gdb_get_register_packet(connection_t *connection, target_t *target, char *pa 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_str_to_target(target, reg_packet, reg_list[reg_num]); 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; } @@ -753,7 +987,7 @@ int gdb_set_register_packet(connection_t *connection, target_t *target, char *pa 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 */ + /* get register arch_type, and call set method */ arch_type = register_get_arch_type(reg_list[reg_num]->arch_type); if (arch_type == NULL) { @@ -778,7 +1012,6 @@ int gdb_memory_packet_error(connection_t *connection, int 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; @@ -789,13 +1022,19 @@ int gdb_memory_packet_error(connection_t *connection, int retval) gdb_send_error(connection, EFAULT); break; default: - ERROR("BUG: unexpected error %i", retval); - exit(-1); + /* This could be that the target reset itself. */ + ERROR("unexpected error %i. Dropping connection.", retval); + return ERROR_SERVER_REMOTE_CLOSED; } 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????? + */ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { char *separator; @@ -805,8 +1044,7 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac u8 *buffer; char *hex_buffer; - int i; - int retval; + int retval = ERROR_OK; /* skip command character */ packet++; @@ -825,33 +1063,37 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len); - switch (len) + retval = target_read_buffer(target, addr, len, buffer); + + if ((retval == ERROR_TARGET_DATA_ABORT) && (!gdb_report_data_abort)) { - 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); + /* 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); - for (i=0; i> 4) & 0xf]; + hex_buffer[2 * i + 1] = DIGITS[t & 0xf]; + } gdb_put_packet(connection, hex_buffer, len * 2); @@ -859,13 +1101,12 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac } else { - if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) - return retval; + retval = gdb_memory_packet_error(connection, retval); } free(buffer); - return ERROR_OK; + return retval; } int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size) @@ -909,31 +1150,7 @@ int gdb_write_memory_packet(connection_t *connection, target_t *target, char *pa buffer[i] = tmp; } - retval = ERROR_OK; - switch (len) - { - /* handle sized writes */ - 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; - /* handle bulk writes */ - default: - retval = target_write_buffer(target, addr, len, buffer); - break; - } + retval = target_write_buffer(target, addr, len, buffer); if (retval == ERROR_OK) { @@ -942,7 +1159,7 @@ int gdb_write_memory_packet(connection_t *connection, target_t *target, char *pa else { if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) - return retval; + return retval; } free(buffer); @@ -956,7 +1173,6 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c u32 addr = 0; u32 len = 0; - u8 *buffer; int retval; /* skip command character */ @@ -979,38 +1195,11 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c } retval = ERROR_OK; - if( len ) { - - buffer = malloc(len); - + if (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); + retval = target_write_buffer(target, addr, len, (u8*)separator); } if (retval == ERROR_OK) @@ -1020,7 +1209,7 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c else { if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK) - return retval; + return retval; } return ERROR_OK; @@ -1167,7 +1356,91 @@ int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, return ERROR_OK; } -void gdb_query_packet(connection_t *connection, char *packet, int packet_size) +/* print out a string and allocate more space as needed, mainly used for XML at this point */ +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 *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_calc_blocksize(flash_bank_t *bank) +{ + int i; + int block_size = 0xffffffff; + + /* loop through all sectors and return smallest sector size */ + + for (i = 0; i < bank->num_sectors; i++) + { + if (bank->sectors[i].size < block_size) + block_size = bank->sectors[i].size; + } + + return block_size; +} + +int gdb_query_packet(connection_t *connection, target_t *target, char *packet, int packet_size) { command_context_t *cmd_ctx = connection->cmd_ctx; @@ -1185,14 +1458,191 @@ void gdb_query_packet(connection_t *connection, char *packet, int packet_size) cmd[i] = tmp; } cmd[(packet_size - 6)/2] = 0x0; + + /* We want to print all debug output to GDB connection */ + log_add_callback(gdb_log_callback, connection); + target_call_timer_callbacks(); command_run_line(cmd_ctx, cmd); + log_remove_callback(gdb_log_callback, connection); free(cmd); } gdb_put_packet(connection, "OK", 2); - return; + return ERROR_OK; + } + else if (strstr(packet, "qCRC:")) + { + if (packet_size > 5) + { + int retval; + char 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 */ + int retval = ERROR_OK; + char *buffer = NULL; + int pos = 0; + int size = 0; + + xml_printf(&retval, &buffer, &pos, &size, + "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-", + (GDB_BUFFER_SIZE - 1), gdb_use_memory_map == 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 (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; + int blocksize; + + /* 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; + + /* if device has uneven sector sizes, eg. str7, lpc + * we pass the smallest sector size to gdb memory map */ + blocksize = gdb_calc_blocksize(p); + + xml_printf(&retval, &xml, &pos, &size, "\n" \ + "0x%x\n" \ + "\n", \ + p->base, p->size, blocksize); + 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; + unsigned 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) @@ -1201,10 +1651,19 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p 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') { @@ -1228,8 +1687,15 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p 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(gdb_service->target, TARGET_EVENT_GDB_PROGRAM); + /* perform erase */ - if ((result = flash_erase(gdb_service->target, addr, length)) != ERROR_OK) + if ((result = flash_erase_address_range(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 @@ -1261,7 +1727,7 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p 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) { @@ -1280,28 +1746,22 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p if (!strcmp(packet, "vFlashDone")) { u32 written; - char *error_str; - /* process the flashing buffer */ - if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, &error_str, NULL, 0)) != ERROR_OK) + /* process the flashing buffer. No need to erase as GDB + * always issues a vFlashErase first. */ + if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 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; @@ -1320,25 +1780,40 @@ int gdb_detach(connection_t *connection, target_t *target) 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) +static void gdb_log_callback(void *priv, const char *file, int line, + const char *function, const char *string) +{ + connection_t *connection = priv; + gdb_connection_t *gdb_con = connection->priv; + + if (gdb_con->busy) + { + /* do not reply this using the O packet */ + return; + } + + gdb_output_con(connection, string); +} + +int gdb_input_inner(connection_t *connection) { gdb_service_t *gdb_service = connection->service->priv; target_t *target = gdb_service->target; @@ -1346,6 +1821,7 @@ int gdb_input(connection_t *connection) int packet_size; int retval; gdb_connection_t *gdb_con = connection->priv; + static int extended_protocol = 0; /* drain input buffer */ do @@ -1353,23 +1829,13 @@ int gdb_input(connection_t *connection) 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); - } + return retval; } /* terminate with zero */ packet[packet_size] = 0; - DEBUG("recevied packet: '%s'", packet); + DEBUG("received packet: '%s'", packet); if (packet_size > 0) { @@ -1377,12 +1843,12 @@ int gdb_input(connection_t *connection) switch (packet[0]) { case 'H': - /* Hct... -- set thread + /* Hct... -- set thread * we don't have threads, send empty reply */ gdb_put_packet(connection, NULL, 0); break; case 'q': - gdb_query_packet(connection, packet, packet_size); + retval = gdb_query_packet(connection, target, packet, packet_size); break; case 'g': retval = gdb_get_registers_packet(connection, target, packet, packet_size); @@ -1411,21 +1877,40 @@ int gdb_input(connection_t *connection) break; case 'c': case 's': - gdb_step_continue_packet(connection, target, packet, packet_size); + { + /* We're running/stepping, in which case we can + * forward log output until the target is halted */ + gdb_connection_t *gdb_con = connection->priv; + gdb_con->frontend_state = TARGET_RUNNING; + log_add_callback(gdb_log_callback, connection); + 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); + extended_protocol = 0; break; case 'X': if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK) return retval; break; case 'k': + if (extended_protocol != 0) + 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 */ + target_process_reset(connection->cmd_ctx); + break; default: /* ignore unkown packets */ DEBUG("ignoring 0x%2.2x packet", packet[0]); @@ -1452,6 +1937,15 @@ int gdb_input(connection_t *connection) return ERROR_OK; } +int gdb_input(connection_t *connection) +{ + int retval = gdb_input_inner(connection); + if (retval == ERROR_SERVER_REMOTE_CLOSED) + return retval; + /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */ + return ERROR_OK; +} + int gdb_init() { gdb_service_t *gdb_service; @@ -1528,17 +2022,82 @@ int handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char 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 handle_gdb_report_data_abort_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) +{ + if (argc == 1) + { + if (strcmp(args[0], "enable") == 0) + { + gdb_report_data_abort = 1; + return ERROR_OK; + } + else if (strcmp(args[0], "disable") == 0) + { + gdb_report_data_abort = 0; + return ERROR_OK; + } + } + + WARNING("invalid gdb_report_data_abort 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, ""); + register_command(command_context, NULL, "gdb_report_data_abort", handle_gdb_report_data_abort_command, + COMMAND_CONFIG, ""); return ERROR_OK; }