[Qemu-devel] [PULL 11/37] gdbstub: add multiprocess support to gdb_vm_state_change()

[Peter Maydell <peter.maydell@linaro.org>]

From: Luc Michel <luc.michel@greensocs.com>

Add support for multiprocess extension in gdb_vm_state_change()
function.

Signed-off-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20181207090135.7651-10-luc.michel@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 gdbstub.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/gdbstub.c b/gdbstub.c
index 1f2b155490d..edee38b6136 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1724,6 +1724,7 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
     GDBState *s = gdbserver_state;
     CPUState *cpu = s->c_cpu;
     char buf[256];
+    char thread_id[16];
     const char *type;
     int ret;
 
@@ -1735,6 +1736,14 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
         put_packet(s, s->syscall_buf);
         return;
     }
+
+    if (cpu == NULL) {
+        /* No process attached */
+        return;
+    }
+
+    gdb_fmt_thread_id(s, cpu, thread_id, sizeof(thread_id));
+
     switch (state) {
     case RUN_STATE_DEBUG:
         if (cpu->watchpoint_hit) {
@@ -1752,8 +1761,8 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
             trace_gdbstub_hit_watchpoint(type, cpu_gdb_index(cpu),
                     (target_ulong)cpu->watchpoint_hit->vaddr);
             snprintf(buf, sizeof(buf),
-                     "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
-                     GDB_SIGNAL_TRAP, cpu_gdb_index(cpu), type,
+                     "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";",
+                     GDB_SIGNAL_TRAP, thread_id, type,
                      (target_ulong)cpu->watchpoint_hit->vaddr);
             cpu->watchpoint_hit = NULL;
             goto send_packet;
@@ -1795,7 +1804,7 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
         break;
     }
     gdb_set_stop_cpu(cpu);
-    snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_gdb_index(cpu));
+    snprintf(buf, sizeof(buf), "T%02xthread:%s;", ret, thread_id);
 
 send_packet:
     put_packet(s, buf);
-- 
2.19.2