gdbstub: Implement deatch (D pkt) with new infra

Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20190529064148.19856-3-arilou@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

gdbstub.c

@@ -1417,11 +1417,6 @@ static inline int startswith(const char *string, const char *pattern)
   return !strncmp(string, pattern, strlen(pattern));
 }
 
-static int process_string_cmd(
-        GDBState *s, void *user_ctx, const char *data,
-        const GdbCmdParseEntry *cmds, int num_cmds)
-        __attribute__((unused));
-
 static int process_string_cmd(GDBState *s, void *user_ctx, const char *data,
                               const GdbCmdParseEntry *cmds, int num_cmds)
 {
@@ -1467,6 +1462,55 @@ static int process_string_cmd(GDBState *s, void *user_ctx, const char *data,
     return -1;
 }
 
+static void run_cmd_parser(GDBState *s, const char *data,
+                           const GdbCmdParseEntry *cmd)
+{
+    if (!data) {
+        return;
+    }
+
+    /* In case there was an error during the command parsing we must
+    * send a NULL packet to indicate the command is not supported */
+    if (process_string_cmd(s, NULL, data, cmd, 1)) {
+        put_packet(s, "");
+    }
+}
+
+static void handle_detach(GdbCmdContext *gdb_ctx, void *user_ctx)
+{
+    GDBProcess *process;
+    GDBState *s = gdb_ctx->s;
+    uint32_t pid = 1;
+
+    if (s->multiprocess) {
+        if (!gdb_ctx->num_params) {
+            put_packet(s, "E22");
+            return;
+        }
+
+        pid = gdb_ctx->params[0].val_ul;
+    }
+
+    process = gdb_get_process(s, pid);
+    gdb_process_breakpoint_remove_all(s, process);
+    process->attached = false;
+
+    if (pid == gdb_get_cpu_pid(s, s->c_cpu)) {
+        s->c_cpu = gdb_first_attached_cpu(s);
+    }
+
+    if (pid == gdb_get_cpu_pid(s, s->g_cpu)) {
+        s->g_cpu = gdb_first_attached_cpu(s);
+    }
+
+    if (!s->c_cpu) {
+        /* No more process attached */
+        gdb_syscall_mode = GDB_SYS_DISABLED;
+        gdb_continue(s);
+    }
+    put_packet(s, "OK");
+}
+
 static int gdb_handle_packet(GDBState *s, const char *line_buf)
 {
     CPUState *cpu;
@@ -1481,6 +1525,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
     uint8_t *registers;
     target_ulong addr, len;
     GDBThreadIdKind thread_kind;
+    const GdbCmdParseEntry *cmd_parser = NULL;
 
     trace_gdbstub_io_command(line_buf);
 
@@ -1581,42 +1626,15 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         error_report("QEMU: Terminated via GDBstub");
         exit(0);
     case 'D':
-        /* Detach packet */
+        {
-        pid = 1;
+            static const GdbCmdParseEntry detach_cmd_desc = {
-
+                .handler = handle_detach,
-        if (s->multiprocess) {
+                .cmd = "D",
-            unsigned long lpid;
+                .cmd_startswith = 1,
-            if (*p != ';') {
+                .schema = "?.l0"
-                put_packet(s, "E22");
+            };
-                break;
+            cmd_parser = &detach_cmd_desc;
-            }
-
-            if (qemu_strtoul(p + 1, &p, 16, &lpid)) {
-                put_packet(s, "E22");
-                break;
-            }
-
-            pid = lpid;
         }
-
-        process = gdb_get_process(s, pid);
-        gdb_process_breakpoint_remove_all(s, process);
-        process->attached = false;
-
-        if (pid == gdb_get_cpu_pid(s, s->c_cpu)) {
-            s->c_cpu = gdb_first_attached_cpu(s);
-        }
-
-        if (pid == gdb_get_cpu_pid(s, s->g_cpu)) {
-            s->g_cpu = gdb_first_attached_cpu(s);
-        }
-
-        if (s->c_cpu == NULL) {
-            /* No more process attached */
-            gdb_syscall_mode = GDB_SYS_DISABLED;
-            gdb_continue(s);
-        }
-        put_packet(s, "OK");
         break;
     case 's':
         if (*p != '\0') {
@@ -1989,6 +2007,9 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         put_packet(s, buf);
         break;
     }
+
+    run_cmd_parser(s, line_buf, cmd_parser);
+
     return RS_IDLE;
 }