gdbstub: Implement generic set/query (Q/q pkt) with new infra
The generic set/query packets contains implementation for varioius sub-commands which are required for GDB and also additional commands which are QEMU specific. To see which QEMU specific commands are available use the command gdb> maintenance packet qqemu.Supported Currently the only implemented QEMU specific command is the command that sets the single step behavior. gdb> maintenance packet qqemu.sstepbits Will display the MASK bits used to control the single stepping. gdb> maintenance packet qqemu.sstep Will display the current value of the mask used when single stepping. gdb> maintenance packet Qqemu.sstep:HEX_VALUE Will change the single step mask. Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-18-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Jon Doron
Alex Bennée
parent
8536ec02fe
commit
2704efad51
559
gdbstub.c
559
gdbstub.c
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@ -1134,14 +1134,6 @@ static GDBThreadIdKind read_thread_id(const char *buf, const char **end_buf,
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return GDB_ONE_THREAD;
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}
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static int is_query_packet(const char *p, const char *query, char separator)
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{
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unsigned int query_len = strlen(query);
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return strncmp(p, query, query_len) == 0 &&
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(p[query_len] == '\0' || p[query_len] == separator);
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}
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/**
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* gdb_handle_vcont - Parses and handles a vCont packet.
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* returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is
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@ -1922,18 +1914,368 @@ static void handle_v_commands(GdbCmdContext *gdb_ctx, void *user_ctx)
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}
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}
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static int gdb_handle_packet(GDBState *s, const char *line_buf)
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static void handle_query_qemu_sstepbits(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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"ENABLE=%x,NOIRQ=%x,NOTIMER=%x", SSTEP_ENABLE,
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SSTEP_NOIRQ, SSTEP_NOTIMER);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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static void handle_set_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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if (!gdb_ctx->num_params) {
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return;
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}
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sstep_flags = gdb_ctx->params[0].val_ul;
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put_packet(gdb_ctx->s, "OK");
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}
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static void handle_query_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "0x%x", sstep_flags);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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static void handle_query_curr_tid(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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CPUState *cpu;
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GDBProcess *process;
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char thread_id[16];
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/*
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* "Current thread" remains vague in the spec, so always return
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* the first thread of the current process (gdb returns the
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* first thread).
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*/
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process = gdb_get_cpu_process(gdb_ctx->s, gdb_ctx->s->g_cpu);
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cpu = get_first_cpu_in_process(gdb_ctx->s, process);
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gdb_fmt_thread_id(gdb_ctx->s, cpu, thread_id, sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "QC%s", thread_id);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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static void handle_query_threads(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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char thread_id[16];
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if (!gdb_ctx->s->query_cpu) {
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put_packet(gdb_ctx->s, "l");
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return;
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}
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gdb_fmt_thread_id(gdb_ctx->s, gdb_ctx->s->query_cpu, thread_id,
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sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "m%s", thread_id);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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gdb_ctx->s->query_cpu =
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gdb_next_attached_cpu(gdb_ctx->s, gdb_ctx->s->query_cpu);
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}
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static void handle_query_first_threads(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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gdb_ctx->s->query_cpu = gdb_first_attached_cpu(gdb_ctx->s);
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handle_query_threads(gdb_ctx, user_ctx);
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}
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static void handle_query_thread_extra(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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CPUState *cpu;
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int len;
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if (!gdb_ctx->num_params ||
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gdb_ctx->params[0].thread_id.kind == GDB_READ_THREAD_ERR) {
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put_packet(gdb_ctx->s, "E22");
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return;
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}
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cpu = gdb_get_cpu(gdb_ctx->s, gdb_ctx->params[0].thread_id.pid,
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gdb_ctx->params[0].thread_id.tid);
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if (!cpu) {
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return;
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}
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cpu_synchronize_state(cpu);
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if (gdb_ctx->s->multiprocess && (gdb_ctx->s->process_num > 1)) {
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/* Print the CPU model and name in multiprocess mode */
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ObjectClass *oc = object_get_class(OBJECT(cpu));
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const char *cpu_model = object_class_get_name(oc);
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char *cpu_name = object_get_canonical_path_component(OBJECT(cpu));
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len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2,
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"%s %s [%s]", cpu_model, cpu_name,
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cpu->halted ? "halted " : "running");
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g_free(cpu_name);
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} else {
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/* memtohex() doubles the required space */
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len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2,
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"CPU#%d [%s]", cpu->cpu_index,
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cpu->halted ? "halted " : "running");
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}
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trace_gdbstub_op_extra_info((char *)gdb_ctx->mem_buf);
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memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, len);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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#ifdef CONFIG_USER_ONLY
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static void handle_query_offsets(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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TaskState *ts;
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ts = gdb_ctx->s->c_cpu->opaque;
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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"Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx
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";Bss=" TARGET_ABI_FMT_lx,
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ts->info->code_offset,
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ts->info->data_offset,
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ts->info->data_offset);
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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#else
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static void handle_query_rcmd(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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int len;
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if (!gdb_ctx->num_params) {
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put_packet(gdb_ctx->s, "E22");
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return;
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}
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len = strlen(gdb_ctx->params[0].data);
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if (len % 2) {
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put_packet(gdb_ctx->s, "E01");
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return;
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}
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len = len / 2;
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hextomem(gdb_ctx->mem_buf, gdb_ctx->params[0].data, len);
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gdb_ctx->mem_buf[len++] = 0;
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qemu_chr_be_write(gdb_ctx->s->mon_chr, gdb_ctx->mem_buf, len);
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put_packet(gdb_ctx->s, "OK");
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}
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#endif
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static void handle_query_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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CPUClass *cc;
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "PacketSize=%x",
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MAX_PACKET_LENGTH);
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cc = CPU_GET_CLASS(first_cpu);
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if (cc->gdb_core_xml_file) {
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pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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";qXfer:features:read+");
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}
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if (gdb_ctx->num_params &&
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strstr(gdb_ctx->params[0].data, "multiprocess+")) {
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gdb_ctx->s->multiprocess = true;
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}
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pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), ";multiprocess+");
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put_packet(gdb_ctx->s, gdb_ctx->str_buf);
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}
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static void handle_query_xfer_features(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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GDBProcess *process;
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CPUClass *cc;
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unsigned long len, total_len, addr;
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const char *xml;
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const char *p;
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uint32_t pid, tid;
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int ch, type;
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if (gdb_ctx->num_params < 3) {
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put_packet(gdb_ctx->s, "E22");
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return;
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}
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process = gdb_get_cpu_process(gdb_ctx->s, gdb_ctx->s->g_cpu);
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cc = CPU_GET_CLASS(gdb_ctx->s->g_cpu);
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if (!cc->gdb_core_xml_file) {
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put_packet(gdb_ctx->s, "");
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return;
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}
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gdb_has_xml = true;
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p = gdb_ctx->params[0].data;
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xml = get_feature_xml(gdb_ctx->s, p, &p, process);
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if (!xml) {
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put_packet(gdb_ctx->s, "E00");
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return;
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}
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addr = gdb_ctx->params[1].val_ul;
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len = gdb_ctx->params[2].val_ul;
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total_len = strlen(xml);
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if (addr > total_len) {
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put_packet(gdb_ctx->s, "E00");
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return;
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}
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if (len > (MAX_PACKET_LENGTH - 5) / 2) {
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len = (MAX_PACKET_LENGTH - 5) / 2;
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}
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if (len < total_len - addr) {
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gdb_ctx->str_buf[0] = 'm';
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len = memtox(gdb_ctx->str_buf + 1, xml + addr, len);
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} else {
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gdb_ctx->str_buf[0] = 'l';
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len = memtox(gdb_ctx->str_buf + 1, xml + addr, total_len - addr);
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}
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put_packet_binary(gdb_ctx->s, gdb_ctx->str_buf, len + 1, true);
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}
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static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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put_packet(gdb_ctx->s, GDB_ATTACHED);
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}
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static void handle_query_qemu_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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put_packet(gdb_ctx->s, "sstepbits;sstep");
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}
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static GdbCmdParseEntry gdb_gen_query_set_common_table[] = {
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/* Order is important if has same prefix */
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{
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.handler = handle_query_qemu_sstepbits,
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.cmd = "qemu.sstepbits",
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},
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{
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.handler = handle_query_qemu_sstep,
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.cmd = "qemu.sstep",
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},
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{
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.handler = handle_set_qemu_sstep,
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.cmd = "qemu.sstep=",
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.cmd_startswith = 1,
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.schema = "l0"
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},
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};
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static GdbCmdParseEntry gdb_gen_query_table[] = {
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{
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.handler = handle_query_curr_tid,
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.cmd = "C",
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},
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{
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.handler = handle_query_threads,
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.cmd = "sThreadInfo",
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},
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{
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.handler = handle_query_first_threads,
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.cmd = "fThreadInfo",
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},
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{
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.handler = handle_query_thread_extra,
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.cmd = "ThreadExtraInfo,",
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.cmd_startswith = 1,
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.schema = "t0"
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},
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#ifdef CONFIG_USER_ONLY
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{
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.handler = handle_query_offsets,
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.cmd = "Offsets",
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},
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#else
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{
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.handler = handle_query_rcmd,
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.cmd = "Rcmd,",
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.cmd_startswith = 1,
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.schema = "s0"
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},
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#endif
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{
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.handler = handle_query_supported,
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.cmd = "Supported:",
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.cmd_startswith = 1,
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.schema = "s0"
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},
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{
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.handler = handle_query_supported,
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.cmd = "Supported",
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.schema = "s0"
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},
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{
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.handler = handle_query_xfer_features,
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.cmd = "Xfer:features:read:",
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.cmd_startswith = 1,
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.schema = "s:l,l0"
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},
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{
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.handler = handle_query_attached,
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.cmd = "Attached:",
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.cmd_startswith = 1
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},
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{
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.handler = handle_query_attached,
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.cmd = "Attached",
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},
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{
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.handler = handle_query_qemu_supported,
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.cmd = "qemu.Supported",
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},
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};
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static GdbCmdParseEntry gdb_gen_set_table[] = {
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/* Order is important if has same prefix */
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{
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.handler = handle_set_qemu_sstep,
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.cmd = "qemu.sstep:",
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.cmd_startswith = 1,
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.schema = "l0"
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},
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};
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static void handle_gen_query(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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if (!gdb_ctx->num_params) {
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return;
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}
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if (!process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data,
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gdb_gen_query_set_common_table,
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ARRAY_SIZE(gdb_gen_query_set_common_table))) {
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return;
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}
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if (process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data,
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gdb_gen_query_table,
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ARRAY_SIZE(gdb_gen_query_table))) {
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put_packet(gdb_ctx->s, "");
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}
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}
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static void handle_gen_set(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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if (!gdb_ctx->num_params) {
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return;
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}
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if (!process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data,
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gdb_gen_query_set_common_table,
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ARRAY_SIZE(gdb_gen_query_set_common_table))) {
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return;
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}
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if (process_string_cmd(gdb_ctx->s, NULL, gdb_ctx->params[0].data,
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gdb_gen_set_table,
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ARRAY_SIZE(gdb_gen_set_table))) {
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put_packet(gdb_ctx->s, "");
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}
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}
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static int gdb_handle_packet(GDBState *s, const char *line_buf)
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{
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const char *p;
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int ch;
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uint8_t mem_buf[MAX_PACKET_LENGTH];
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char buf[sizeof(mem_buf) + 1 /* trailing NUL */];
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char thread_id[16];
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target_ulong addr, len;
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const GdbCmdParseEntry *cmd_parser = NULL;
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trace_gdbstub_io_command(line_buf);
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@ -2135,183 +2477,28 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
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}
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break;
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case 'q':
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{
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static const GdbCmdParseEntry gen_query_cmd_desc = {
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.handler = handle_gen_query,
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.cmd = "q",
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.cmd_startswith = 1,
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.schema = "s0"
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};
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cmd_parser = &gen_query_cmd_desc;
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}
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break;
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case 'Q':
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/* parse any 'q' packets here */
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if (!strcmp(p,"qemu.sstepbits")) {
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/* Query Breakpoint bit definitions */
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snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
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SSTEP_ENABLE,
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SSTEP_NOIRQ,
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SSTEP_NOTIMER);
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put_packet(s, buf);
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break;
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} else if (is_query_packet(p, "qemu.sstep", '=')) {
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/* Display or change the sstep_flags */
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p += 10;
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if (*p != '=') {
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/* Display current setting */
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snprintf(buf, sizeof(buf), "0x%x", sstep_flags);
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put_packet(s, buf);
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break;
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}
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p++;
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type = strtoul(p, (char **)&p, 16);
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sstep_flags = type;
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put_packet(s, "OK");
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break;
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} else if (strcmp(p,"C") == 0) {
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/*
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* "Current thread" remains vague in the spec, so always return
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* the first thread of the current process (gdb returns the
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* first thread).
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*/
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cpu = get_first_cpu_in_process(s, gdb_get_cpu_process(s, s->g_cpu));
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snprintf(buf, sizeof(buf), "QC%s",
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gdb_fmt_thread_id(s, cpu, thread_id, sizeof(thread_id)));
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put_packet(s, buf);
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break;
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} else if (strcmp(p,"fThreadInfo") == 0) {
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s->query_cpu = gdb_first_attached_cpu(s);
|
||||
goto report_cpuinfo;
|
||||
} else if (strcmp(p,"sThreadInfo") == 0) {
|
||||
report_cpuinfo:
|
||||
if (s->query_cpu) {
|
||||
snprintf(buf, sizeof(buf), "m%s",
|
||||
gdb_fmt_thread_id(s, s->query_cpu,
|
||||
thread_id, sizeof(thread_id)));
|
||||
put_packet(s, buf);
|
||||
s->query_cpu = gdb_next_attached_cpu(s, s->query_cpu);
|
||||
} else
|
||||
put_packet(s, "l");
|
||||
break;
|
||||
} else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) {
|
||||
if (read_thread_id(p + 16, &p, &pid, &tid) == GDB_READ_THREAD_ERR) {
|
||||
put_packet(s, "E22");
|
||||
break;
|
||||
}
|
||||
cpu = gdb_get_cpu(s, pid, tid);
|
||||
if (cpu != NULL) {
|
||||
cpu_synchronize_state(cpu);
|
||||
|
||||
if (s->multiprocess && (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 *)mem_buf, sizeof(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 *)mem_buf, sizeof(buf) / 2,
|
||||
"CPU#%d [%s]", cpu->cpu_index,
|
||||
cpu->halted ? "halted " : "running");
|
||||
}
|
||||
trace_gdbstub_op_extra_info((char *)mem_buf);
|
||||
memtohex(buf, mem_buf, len);
|
||||
put_packet(s, buf);
|
||||
}
|
||||
break;
|
||||
{
|
||||
static const GdbCmdParseEntry gen_set_cmd_desc = {
|
||||
.handler = handle_gen_set,
|
||||
.cmd = "Q",
|
||||
.cmd_startswith = 1,
|
||||
.schema = "s0"
|
||||
};
|
||||
cmd_parser = &gen_set_cmd_desc;
|
||||
}
|
||||
#ifdef CONFIG_USER_ONLY
|
||||
else if (strcmp(p, "Offsets") == 0) {
|
||||
TaskState *ts = s->c_cpu->opaque;
|
||||
|
||||
snprintf(buf, sizeof(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(s, buf);
|
||||
break;
|
||||
}
|
||||
#else /* !CONFIG_USER_ONLY */
|
||||
else if (strncmp(p, "Rcmd,", 5) == 0) {
|
||||
int len = strlen(p + 5);
|
||||
|
||||
if ((len % 2) != 0) {
|
||||
put_packet(s, "E01");
|
||||
break;
|
||||
}
|
||||
len = len / 2;
|
||||
hextomem(mem_buf, p + 5, len);
|
||||
mem_buf[len++] = 0;
|
||||
qemu_chr_be_write(s->mon_chr, mem_buf, len);
|
||||
put_packet(s, "OK");
|
||||
break;
|
||||
}
|
||||
#endif /* !CONFIG_USER_ONLY */
|
||||
if (is_query_packet(p, "Supported", ':')) {
|
||||
snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH);
|
||||
cc = CPU_GET_CLASS(first_cpu);
|
||||
if (cc->gdb_core_xml_file != NULL) {
|
||||
pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
|
||||
}
|
||||
|
||||
if (strstr(p, "multiprocess+")) {
|
||||
s->multiprocess = true;
|
||||
}
|
||||
pstrcat(buf, sizeof(buf), ";multiprocess+");
|
||||
|
||||
put_packet(s, buf);
|
||||
break;
|
||||
}
|
||||
if (strncmp(p, "Xfer:features:read:", 19) == 0) {
|
||||
const char *xml;
|
||||
target_ulong total_len;
|
||||
|
||||
process = gdb_get_cpu_process(s, s->g_cpu);
|
||||
cc = CPU_GET_CLASS(s->g_cpu);
|
||||
if (cc->gdb_core_xml_file == NULL) {
|
||||
goto unknown_command;
|
||||
}
|
||||
|
||||
gdb_has_xml = true;
|
||||
p += 19;
|
||||
xml = get_feature_xml(s, p, &p, process);
|
||||
if (!xml) {
|
||||
snprintf(buf, sizeof(buf), "E00");
|
||||
put_packet(s, buf);
|
||||
break;
|
||||
}
|
||||
|
||||
if (*p == ':')
|
||||
p++;
|
||||
addr = strtoul(p, (char **)&p, 16);
|
||||
if (*p == ',')
|
||||
p++;
|
||||
len = strtoul(p, (char **)&p, 16);
|
||||
|
||||
total_len = strlen(xml);
|
||||
if (addr > total_len) {
|
||||
snprintf(buf, sizeof(buf), "E00");
|
||||
put_packet(s, buf);
|
||||
break;
|
||||
}
|
||||
if (len > (MAX_PACKET_LENGTH - 5) / 2)
|
||||
len = (MAX_PACKET_LENGTH - 5) / 2;
|
||||
if (len < total_len - addr) {
|
||||
buf[0] = 'm';
|
||||
len = memtox(buf + 1, xml + addr, len);
|
||||
} else {
|
||||
buf[0] = 'l';
|
||||
len = memtox(buf + 1, xml + addr, total_len - addr);
|
||||
}
|
||||
put_packet_binary(s, buf, len + 1, true);
|
||||
break;
|
||||
}
|
||||
if (is_query_packet(p, "Attached", ':')) {
|
||||
put_packet(s, GDB_ATTACHED);
|
||||
break;
|
||||
}
|
||||
/* Unrecognised 'q' command. */
|
||||
goto unknown_command;
|
||||
|
||||
break;
|
||||
default:
|
||||
unknown_command:
|
||||
/* put empty packet */
|
||||
buf[0] = '\0';
|
||||
put_packet(s, buf);
|
||||
|
|
|
|||
Loading…
Reference in New Issue