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X-Received-From: 2a00:1450:4864:20::441 Subject: [Qemu-devel] [PATCH v3 18/20] gdbstub: Implement generic query (q pkt) with new infra X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jon Doron Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Jon Doron Signed-off-by: Jon Doron --- gdbstub.c | 335 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 335 insertions(+) diff --git a/gdbstub.c b/gdbstub.c index 2dc088180d..f8389528fe 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -1931,6 +1931,331 @@ static void handle_v_commands(GdbCmdContext *gdb_ctx, void *user_ctx) } } +static void handle_query_qemu_sstepbits(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), + "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", SSTEP_ENABLE, + SSTEP_NOIRQ, SSTEP_NOTIMER); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} + +static void handle_set_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + if (!gdb_ctx->num_params) { + return; + } + + sstep_flags = gdb_ctx->params[0].val_ul; + put_packet(gdb_ctx->s, "OK"); +} + +static void handle_query_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "0x%x", sstep_flags); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} + +static void handle_query_curr_tid(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + CPUState *cpu; + GDBProcess *process; + char thread_id[16]; + + /* + * "Current thread" remains vague in the spec, so always return + * the first thread of the current process (gdb returns the + * first thread). + */ + process = gdb_get_cpu_process(gdb_ctx->s, gdb_ctx->s->g_cpu); + cpu = get_first_cpu_in_process(gdb_ctx->s, process); + gdb_fmt_thread_id(gdb_ctx->s, cpu, thread_id, sizeof(thread_id)); + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "QC%s", thread_id); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} + +static void handle_query_threads(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + char thread_id[16]; + + if (!gdb_ctx->s->query_cpu) { + put_packet(gdb_ctx->s, "l"); + return; + } + + gdb_fmt_thread_id(gdb_ctx->s, gdb_ctx->s->query_cpu, thread_id, + sizeof(thread_id)); + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "m%s", thread_id); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); + gdb_ctx->s->query_cpu = + gdb_next_attached_cpu(gdb_ctx->s, gdb_ctx->s->query_cpu); +} + +static void handle_query_first_threads(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + gdb_ctx->s->query_cpu = gdb_first_attached_cpu(gdb_ctx->s); + handle_query_threads(gdb_ctx, user_ctx); +} + +static void handle_query_thread_extra(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + CPUState *cpu; + int len; + + if (!gdb_ctx->num_params || + gdb_ctx->params[0].thread_id.kind == GDB_READ_THREAD_ERR) { + put_packet(gdb_ctx->s, "E22"); + return; + } + + cpu = gdb_get_cpu(gdb_ctx->s, gdb_ctx->params[0].thread_id.pid, + gdb_ctx->params[0].thread_id.tid); + if (!cpu) { + return; + } + + cpu_synchronize_state(cpu); + + if (gdb_ctx->s->multiprocess && (gdb_ctx->s->process_num > 1)) { + /* Print the CPU model and name in multiprocess mode */ + ObjectClass *oc = object_get_class(OBJECT(cpu)); + const char *cpu_model = object_class_get_name(oc); + char *cpu_name = object_get_canonical_path_component(OBJECT(cpu)); + len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2, + "%s %s [%s]", cpu_model, cpu_name, + cpu->halted ? "halted " : "running"); + g_free(cpu_name); + } else { + /* memtohex() doubles the required space */ + len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2, + "CPU#%d [%s]", cpu->cpu_index, + cpu->halted ? "halted " : "running"); + } + trace_gdbstub_op_extra_info((char *)gdb_ctx->mem_buf); + memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, len); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} + +#ifdef CONFIG_USER_ONLY +static void handle_query_offsets(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + TaskState *ts; + + ts = gdb_ctx->s->c_cpu->opaque; + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), + "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx + ";Bss=" TARGET_ABI_FMT_lx, + ts->info->code_offset, + ts->info->data_offset, + ts->info->data_offset); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} +#else +static void handle_query_rcmd(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + int len; + + if (!gdb_ctx->num_params) { + put_packet(gdb_ctx->s, "E22"); + return; + } + + len = strlen(gdb_ctx->params[0].data); + if (len % 2) { + put_packet(gdb_ctx->s, "E01"); + return; + } + + len = len / 2; + hextomem(gdb_ctx->mem_buf, gdb_ctx->params[0].data, len); + gdb_ctx->mem_buf[len++] = 0; + qemu_chr_be_write(gdb_ctx->s->mon_chr, gdb_ctx->mem_buf, len); + put_packet(gdb_ctx->s, "OK"); + +} +#endif + +static void handle_query_supported(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + CPUClass *cc; + + snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "PacketSize=%x", + MAX_PACKET_LENGTH); + cc = CPU_GET_CLASS(first_cpu); + if (cc->gdb_core_xml_file) { + pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), + ";qXfer:features:read+"); + } + + if (gdb_ctx->num_params && + strstr(gdb_ctx->params[0].data, "multiprocess+")) { + gdb_ctx->s->multiprocess = true; + } + + pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), ";multiprocess+"); + put_packet(gdb_ctx->s, gdb_ctx->str_buf); +} + +static void handle_query_xfer_features(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + GDBProcess *process; + CPUClass *cc; + unsigned long len, total_len, addr; + const char *xml; + const char *p; + + if (gdb_ctx->num_params < 3) { + put_packet(gdb_ctx->s, "E22"); + return; + } + + process = gdb_get_cpu_process(gdb_ctx->s, gdb_ctx->s->g_cpu); + cc = CPU_GET_CLASS(gdb_ctx->s->g_cpu); + if (!cc->gdb_core_xml_file) { + put_packet(gdb_ctx->s, ""); + return; + } + + gdb_has_xml = true; + p = gdb_ctx->params[0].data; + xml = get_feature_xml(gdb_ctx->s, p, &p, process); + if (!xml) { + put_packet(gdb_ctx->s, "E00"); + return; + } + + addr = gdb_ctx->params[1].val_ul; + len = gdb_ctx->params[2].val_ul; + total_len = strlen(xml); + if (addr > total_len) { + put_packet(gdb_ctx->s, "E00"); + return; + } + + if (len > (MAX_PACKET_LENGTH - 5) / 2) { + len = (MAX_PACKET_LENGTH - 5) / 2; + } + + if (len < total_len - addr) { + gdb_ctx->str_buf[0] = 'm'; + len = memtox(gdb_ctx->str_buf + 1, xml + addr, len); + } else { + gdb_ctx->str_buf[0] = 'l'; + len = memtox(gdb_ctx->str_buf + 1, xml + addr, total_len - addr); + } + + put_packet_binary(gdb_ctx->s, gdb_ctx->str_buf, len + 1, true); +} + +static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + put_packet(gdb_ctx->s, GDB_ATTACHED); +} + +static GdbCmdParseEntry gdb_gen_query_set_common_table[] = { + /* Order is important if has same prefix */ + { + .handler = handle_query_qemu_sstepbits, + .cmd = "qemu.sstepbits", + .cmd_full_match = 1 + }, + { + .handler = handle_query_qemu_sstep, + .cmd = "qemu.sstep", + .cmd_full_match = 1, + }, + { + .handler = handle_set_qemu_sstep, + .cmd = "qemu.sstep=", + .cmd_startswith = 1, + .schema = "l0" + }, +}; + +static GdbCmdParseEntry gdb_gen_query_table[] = { + { + .handler = handle_query_curr_tid, + .cmd = "C", + .cmd_full_match = 1 + }, + { + .handler = handle_query_threads, + .cmd = "sThreadInfo", + .cmd_full_match = 1 + }, + { + .handler = handle_query_first_threads, + .cmd = "fThreadInfo", + .cmd_full_match = 1 + }, + { + .handler = handle_query_thread_extra, + .cmd = "ThreadExtraInfo,", + .cmd_startswith = 1, + .schema = "t0" + }, +#ifdef CONFIG_USER_ONLY + { + .handler = handle_query_offsets, + .cmd = "Offsets", + .cmd_full_match = 1 + }, +#else + { + .handler = handle_query_rcmd, + .cmd = "Rcmd,", + .cmd_startswith = 1, + .schema = "s0" + }, +#endif + { + .handler = handle_query_supported, + .cmd = "Supported:", + .cmd_startswith = 1, + .schema = "s0" + }, + { + .handler = handle_query_supported, + .cmd = "Supported", + .cmd_full_match = 1, + .schema = "s0" + }, + { + .handler = handle_query_xfer_features, + .cmd = "Xfer:features:read:", + .cmd_startswith = 1, + .schema = "x:l,l0" + }, + { + .handler = handle_query_attached, + .cmd = "Attached:", + .cmd_startswith = 1 + }, + { + .handler = handle_query_attached, + .cmd = "Attached", + .cmd_full_match = 1 + }, +}; + +static void handle_gen_query(GdbCmdContext *gdb_ctx, void *user_ctx) +{ + if (!gdb_ctx->num_params) { + return; + } + + if (!process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data, + gdb_gen_query_set_common_table, + ARRAY_SIZE(gdb_gen_query_set_common_table))) { + return; + } + + if (process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data, + gdb_gen_query_table, + ARRAY_SIZE(gdb_gen_query_table))) { + put_packet(gdb_ctx->s, ""); + } +} + static int gdb_handle_packet(GDBState *s, const char *line_buf) { CPUState *cpu; @@ -2143,6 +2468,16 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) } break; case 'q': + { + static GdbCmdParseEntry gen_query_cmd_desc = { + .handler = handle_gen_query, + .cmd = "q", + .cmd_startswith = 1, + .schema = "s0" + }; + process_string_cmd(s, NULL, line_buf, &gen_query_cmd_desc, 1); + } + break; case 'Q': /* parse any 'q' packets here */ if (!strcmp(p,"qemu.sstepbits")) {