diff mbox series

[02/29] gdbstub: Support disablement in a multi-threaded process

Message ID 20240305121005.3528075-3-alex.bennee@linaro.org (mailing list archive)
State New, archived
Headers show
Series maintainer/next for 9.0 (testing, gdbstub, plugins, disas) | expand

Commit Message

Alex Bennée March 5, 2024, 12:09 p.m. UTC 
From: Ilya Leoshkevich <iii@linux.ibm.com>

The upcoming follow-fork-mode child support will require disabling
gdbstub in the parent process, which may have multiple threads (which
are represented as CPUs).

Loop over all CPUs in order to remove breakpoints and disable
single-step. Move the respective code into a separate function.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240219141628.246823-2-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 gdbstub/user.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/gdbstub/user.c b/gdbstub/user.c
index 14918d1a217..3ce20b7bbfc 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -356,16 +356,27 @@  int gdbserver_start(const char *port_or_path)
     return -1;
 }
 
+static void disable_gdbstub(CPUState *thread_cpu)
+{
+    CPUState *cpu;
+
+    close(gdbserver_user_state.fd);
+    gdbserver_user_state.fd = -1;
+    CPU_FOREACH(cpu) {
+        cpu_breakpoint_remove_all(cpu, BP_GDB);
+        /* no cpu_watchpoint_remove_all for user-mode */
+        cpu_single_step(cpu, 0);
+    }
+    tb_flush(thread_cpu);
+}
+
 /* Disable gdb stub for child processes.  */
 void gdbserver_fork(CPUState *cpu)
 {
     if (!gdbserver_state.init || gdbserver_user_state.fd < 0) {
         return;
     }
-    close(gdbserver_user_state.fd);
-    gdbserver_user_state.fd = -1;
-    cpu_breakpoint_remove_all(cpu, BP_GDB);
-    /* no cpu_watchpoint_remove_all for user-mode */
+    disable_gdbstub(cpu);
 }
 
 /*