gdbstub: Implement v commands with new infra

Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20190529064148.19856-17-arilou@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

gdbstub.c

@@ -1822,6 +1822,106 @@ static void handle_step(GdbCmdContext *gdb_ctx, void *user_ctx)
     gdb_continue(gdb_ctx->s);
 }
 
+static void handle_v_cont_query(GdbCmdContext *gdb_ctx, void *user_ctx)
+{
+    put_packet(gdb_ctx->s, "vCont;c;C;s;S");
+}
+
+static void handle_v_cont(GdbCmdContext *gdb_ctx, void *user_ctx)
+{
+    int res;
+
+    if (!gdb_ctx->num_params) {
+        return;
+    }
+
+    res = gdb_handle_vcont(gdb_ctx->s, gdb_ctx->params[0].data);
+    if ((res == -EINVAL) || (res == -ERANGE)) {
+        put_packet(gdb_ctx->s, "E22");
+    } else if (res) {
+        put_packet(gdb_ctx->s, "");
+    }
+}
+
+static void handle_v_attach(GdbCmdContext *gdb_ctx, void *user_ctx)
+{
+    GDBProcess *process;
+    CPUState *cpu;
+    char thread_id[16];
+
+    pstrcpy(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "E22");
+    if (!gdb_ctx->num_params) {
+        goto cleanup;
+    }
+
+    process = gdb_get_process(gdb_ctx->s, gdb_ctx->params[0].val_ul);
+    if (!process) {
+        goto cleanup;
+    }
+
+    cpu = get_first_cpu_in_process(gdb_ctx->s, process);
+    if (!cpu) {
+        goto cleanup;
+    }
+
+    process->attached = true;
+    gdb_ctx->s->g_cpu = cpu;
+    gdb_ctx->s->c_cpu = cpu;
+
+    gdb_fmt_thread_id(gdb_ctx->s, cpu, thread_id, sizeof(thread_id));
+    snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "T%02xthread:%s;",
+             GDB_SIGNAL_TRAP, thread_id);
+cleanup:
+    put_packet(gdb_ctx->s, gdb_ctx->str_buf);
+}
+
+static void handle_v_kill(GdbCmdContext *gdb_ctx, void *user_ctx)
+{
+    /* Kill the target */
+    put_packet(gdb_ctx->s, "OK");
+    error_report("QEMU: Terminated via GDBstub");
+    exit(0);
+}
+
+static GdbCmdParseEntry gdb_v_commands_table[] = {
+    /* Order is important if has same prefix */
+    {
+        .handler = handle_v_cont_query,
+        .cmd = "Cont?",
+        .cmd_startswith = 1
+    },
+    {
+        .handler = handle_v_cont,
+        .cmd = "Cont",
+        .cmd_startswith = 1,
+        .schema = "s0"
+    },
+    {
+        .handler = handle_v_attach,
+        .cmd = "Attach;",
+        .cmd_startswith = 1,
+        .schema = "l0"
+    },
+    {
+        .handler = handle_v_kill,
+        .cmd = "Kill;",
+        .cmd_startswith = 1
+    },
+};
+
+static void handle_v_commands(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_v_commands_table,
+                           ARRAY_SIZE(gdb_v_commands_table))) {
+        put_packet(gdb_ctx->s, "");
+    }
+}
+
 static int gdb_handle_packet(GDBState *s, const char *line_buf)
 {
     CPUState *cpu;
@@ -1829,7 +1929,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
     CPUClass *cc;
     const char *p;
     uint32_t pid, tid;
-    int ch, type, res;
+    int ch, type;
     uint8_t mem_buf[MAX_PACKET_LENGTH];
     char buf[sizeof(mem_buf) + 1 /* trailing NUL */];
     char thread_id[16];
@@ -1878,66 +1978,16 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         }
         break;
     case 'v':
-        if (strncmp(p, "Cont", 4) == 0) {
+        {
-            p += 4;
+            static const GdbCmdParseEntry v_cmd_desc = {
-            if (*p == '?') {
+                .handler = handle_v_commands,
-                put_packet(s, "vCont;c;C;s;S");
+                .cmd = "v",
-                break;
+                .cmd_startswith = 1,
-            }
+                .schema = "s0"
-
+            };
-            res = gdb_handle_vcont(s, p);
+            cmd_parser = &v_cmd_desc;
-
-            if (res) {
-                if ((res == -EINVAL) || (res == -ERANGE)) {
-                    put_packet(s, "E22");
-                    break;
-                }
-                goto unknown_command;
-            }
-            break;
-        } else if (strncmp(p, "Attach;", 7) == 0) {
-            unsigned long pid;
-
-            p += 7;
-
-            if (qemu_strtoul(p, &p, 16, &pid)) {
-                put_packet(s, "E22");
-                break;
-            }
-
-            process = gdb_get_process(s, pid);
-
-            if (process == NULL) {
-                put_packet(s, "E22");
-                break;
-            }
-
-            cpu = get_first_cpu_in_process(s, process);
-
-            if (cpu == NULL) {
-                /* Refuse to attach an empty process */
-                put_packet(s, "E22");
-                break;
-            }
-
-            process->attached = true;
-
-            s->g_cpu = cpu;
-            s->c_cpu = cpu;
-
-            snprintf(buf, sizeof(buf), "T%02xthread:%s;", GDB_SIGNAL_TRAP,
-                     gdb_fmt_thread_id(s, cpu, thread_id, sizeof(thread_id)));
-
-            put_packet(s, buf);
-            break;
-        } else if (strncmp(p, "Kill;", 5) == 0) {
-            /* Kill the target */
-            put_packet(s, "OK");
-            error_report("QEMU: Terminated via GDBstub");
-            exit(0);
-        } else {
-            goto unknown_command;
         }
+        break;
     case 'k':
         /* Kill the target */
         error_report("QEMU: Terminated via GDBstub");