From aadcc24aac4da5f421bf114551240298fada2aff Mon Sep 17 00:00:00 2001
From: Duncan Ogilvie <mr.exodia.tpodt@gmail.com>
Date: Thu, 4 Jun 2026 05:49:23 +0200
Subject: [core/debugger] Protocol-compliant vCont support (#3896)

(gdb) set scheduler-locking on
(gdb) continue

As discussed in #3848, follow-up to implement vCont support according to spec.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3896
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
---
 src/core/debugger/debugger.cpp | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

(limited to 'src/core/debugger/debugger.cpp')

diff --git a/src/core/debugger/debugger.cpp b/src/core/debugger/debugger.cpp
index 7924ea0d45..f90e78f959 100644
--- a/src/core/debugger/debugger.cpp
+++ b/src/core/debugger/debugger.cpp
@@ -247,17 +247,19 @@ private:
             case DebuggerAction::Continue:
                 MarkResumed([&] { ResumeEmulation(); });
                 break;
-            case DebuggerAction::StepThreadUnlocked:
-                MarkResumed([&] {
-                    state->active_thread->SetStepState(Kernel::StepState::StepPending);
-                    state->active_thread->Resume(Kernel::SuspendType::Debug);
-                    ResumeEmulation(state->active_thread.GetPointerUnsafe());
+            case DebuggerAction::ContinueThreads: {
+                auto* gdb = static_cast<GDBStub*>(frontend.get());
+                MarkResumed([this, threads = std::move(gdb->resume_threads)] {
+                    ResumeThreads(threads);
                 });
                 break;
-            case DebuggerAction::StepThreadLocked: {
-                MarkResumed([&] {
+            }
+            case DebuggerAction::StepThread: {
+                auto* gdb = static_cast<GDBStub*>(frontend.get());
+                MarkResumed([this, threads = std::move(gdb->resume_threads)] {
                     state->active_thread->SetStepState(Kernel::StepState::StepPending);
                     state->active_thread->Resume(Kernel::SuspendType::Debug);
+                    ResumeThreads(threads, state->active_thread.GetPointerUnsafe());
                 });
                 break;
             }
@@ -298,6 +300,22 @@ private:
         }
     }
 
+    void ResumeThreads(const std::vector<Kernel::KThread*>& threads,
+                       Kernel::KThread* except = nullptr) {
+        Kernel::KScopedLightLock ll{debug_process->GetListLock()};
+        Kernel::KScopedSchedulerLock sl{system.Kernel()};
+
+        // Wake up only the specified threads.
+        for (auto* thread : threads) {
+            if (!thread || thread == except) {
+                continue;
+            }
+
+            thread->SetStepState(Kernel::StepState::NotStepping);
+            thread->Resume(Kernel::SuspendType::Debug);
+        }
+    }
+
     template <typename Callback>
     void MarkResumed(Callback&& cb) {
         stopped = false;
-- 
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