bsd-user: Move system call building to os-syscall.c

[mirror_qemu.git] / gdbstub.c

diff --git a/gdbstub.c b/gdbstub.c
index 36b85aa50e24988831400dc535479b26b1de674f..3c14c6a03831dffb77847ea4d7559d7561413f2f 100644 (file)
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -94,7 +94,7 @@ static inline int cpu_gdb_index(CPUState *cpu)
 {
 #if defined(CONFIG_USER_ONLY)
     TaskState *ts = (TaskState *) cpu->opaque;
-    return ts->ts_tid;
+    return ts ? ts->ts_tid : -1;
 #else
     return cpu->cpu_index + 1;
 #endif
@@ -368,27 +368,10 @@ typedef struct GDBState {
     gdb_syscall_complete_cb current_syscall_cb;
     GString *str_buf;
     GByteArray *mem_buf;
+    int sstep_flags;
+    int supported_sstep_flags;
 } GDBState;
 
-/* By default use no IRQs and no timers while single stepping so as to
- * make single stepping like an ICE HW step.
- */
-static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;
-
-/* Retrieves flags for single step mode. */
-static int get_sstep_flags(void)
-{
-    /*
-     * In replay mode all events written into the log should be replayed.
-     * That is why NOIRQ flag is removed in this mode.
-     */
-    if (replay_mode != REPLAY_MODE_NONE) {
-        return SSTEP_ENABLE;
-    } else {
-        return sstep_flags;
-    }
-}
-
 static GDBState gdbserver_state;
 
 static void init_gdbserver_state(void)
@@ -399,6 +382,29 @@ static void init_gdbserver_state(void)
     gdbserver_state.str_buf = g_string_new(NULL);
     gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH);
     gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4);
+
+    /*
+     * In replay mode all events will come from the log and can't be
+     * suppressed otherwise we would break determinism. However as those
+     * events are tied to the number of executed instructions we won't see
+     * them occurring every time we single step.
+     */
+    if (replay_mode != REPLAY_MODE_NONE) {
+        gdbserver_state.supported_sstep_flags = SSTEP_ENABLE;
+    } else if (kvm_enabled()) {
+        gdbserver_state.supported_sstep_flags = kvm_get_supported_sstep_flags();
+    } else {
+        gdbserver_state.supported_sstep_flags =
+            SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER;
+    }
+
+    /*
+     * By default use no IRQs and no timers while single stepping so as to
+     * make single stepping like an ICE HW step.
+     */
+    gdbserver_state.sstep_flags = SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER;
+    gdbserver_state.sstep_flags &= gdbserver_state.supported_sstep_flags;
+
 }
 
 #ifndef CONFIG_USER_ONLY
@@ -505,7 +511,7 @@ static int gdb_continue_partial(char *newstates)
     CPU_FOREACH(cpu) {
         if (newstates[cpu->cpu_index] == 's') {
             trace_gdbstub_op_stepping(cpu->cpu_index);
-            cpu_single_step(cpu, sstep_flags);
+            cpu_single_step(cpu, gdbserver_state.sstep_flags);
         }
     }
     gdbserver_state.running_state = 1;
@@ -524,7 +530,7 @@ static int gdb_continue_partial(char *newstates)
                 break; /* nothing to do here */
             case 's':
                 trace_gdbstub_op_stepping(cpu->cpu_index);
-                cpu_single_step(cpu, get_sstep_flags());
+                cpu_single_step(cpu, gdbserver_state.sstep_flags);
                 cpu_resume(cpu);
                 flag = 1;
                 break;
@@ -1883,7 +1889,7 @@ static void handle_step(GArray *params, void *user_ctx)
         gdb_set_cpu_pc((target_ulong)get_param(params, 0)->val_ull);
     }
 
-    cpu_single_step(gdbserver_state.c_cpu, get_sstep_flags());
+    cpu_single_step(gdbserver_state.c_cpu, gdbserver_state.sstep_flags);
     gdb_continue();
 }
 
@@ -2017,24 +2023,44 @@ static void handle_v_commands(GArray *params, void *user_ctx)
 
 static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx)
 {
-    g_string_printf(gdbserver_state.str_buf, "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
-                    SSTEP_ENABLE, SSTEP_NOIRQ, SSTEP_NOTIMER);
+    g_string_printf(gdbserver_state.str_buf, "ENABLE=%x", SSTEP_ENABLE);
+
+    if (gdbserver_state.supported_sstep_flags & SSTEP_NOIRQ) {
+        g_string_append_printf(gdbserver_state.str_buf, ",NOIRQ=%x",
+                               SSTEP_NOIRQ);
+    }
+
+    if (gdbserver_state.supported_sstep_flags & SSTEP_NOTIMER) {
+        g_string_append_printf(gdbserver_state.str_buf, ",NOTIMER=%x",
+                               SSTEP_NOTIMER);
+    }
+
     put_strbuf();
 }
 
 static void handle_set_qemu_sstep(GArray *params, void *user_ctx)
 {
+    int new_sstep_flags;
+
     if (!params->len) {
         return;
     }
 
-    sstep_flags = get_param(params, 0)->val_ul;
+    new_sstep_flags = get_param(params, 0)->val_ul;
+
+    if (new_sstep_flags  & ~gdbserver_state.supported_sstep_flags) {
+        put_packet("E22");
+        return;
+    }
+
+    gdbserver_state.sstep_flags = new_sstep_flags;
     put_packet("OK");
 }
 
 static void handle_query_qemu_sstep(GArray *params, void *user_ctx)
 {
-    g_string_printf(gdbserver_state.str_buf, "0x%x", sstep_flags);
+    g_string_printf(gdbserver_state.str_buf, "0x%x",
+                    gdbserver_state.sstep_flags);
     put_strbuf();
 }
 
@@ -3138,8 +3164,12 @@ gdb_handlesig(CPUState *cpu, int sig)
     tb_flush(cpu);
 
     if (sig != 0) {
-        snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig));
-        put_packet(buf);
+        gdb_set_stop_cpu(cpu);
+        g_string_printf(gdbserver_state.str_buf,
+                        "T%02xthread:", target_signal_to_gdb(sig));
+        gdb_append_thread_id(cpu, gdbserver_state.str_buf);
+        g_string_append_c(gdbserver_state.str_buf, ';');
+        put_strbuf();
     }
     /* put_packet() might have detected that the peer terminated the
        connection.  */
@@ -3493,6 +3523,11 @@ int gdbserver_start(const char *device)
         return -1;
     }
 
+    if (kvm_enabled() && !kvm_supports_guest_debug()) {
+        error_report("gdbstub: KVM doesn't support guest debugging");
+        return -1;
+    }
+
     if (!device)
         return -1;
     if (strcmp(device, "none") != 0) {