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thermosphere: gdb: properly handle vStopped ack sequence

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This commit is contained in:
TuxSH 2020-01-30 01:56:31 +00:00
parent 36ca87491d
commit b0ca29d18e
3 changed files with 33 additions and 12 deletions
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5
thermosphere/src/gdb/context.c
View file

@ -130,9 +130,14 @@ static void GDB_Disconnect(GDBContext *ctx)
ctx->currentThreadId = 0;
ctx->selectedThreadId = 0;
ctx->selectedThreadIdForContinuing = 0;
ctx->sentDebugEventCoreList = 0;
ctx->acknowledgedDebugEventCoreList = 0;
ctx->attachedCoreList = 0;
ctx->sendOwnDebugEventDisallowed = false;
ctx->catchThreadEvents = false;
ctx->lastSentPacketSize = 0;
ctx->lastDebugEvent = NULL;
ctx->processEnded = false;
ctx->processExited = false;

3
thermosphere/src/gdb/context.h
View file

@ -78,8 +78,9 @@ typedef struct GDBContext {
int selectedThreadIdForContinuing;
u32 sentDebugEventCoreList;
u32 acknowledgedDebugEventCoreList;
bool sendOwnDebugEventAllowed;
bool sendOwnDebugEventDisallowed;
bool catchThreadEvents;
bool processEnded, processExited;

37
thermosphere/src/gdb/debug.c
View file

@ -177,6 +177,9 @@ int GDB_SendStopReply(GDBContext *ctx, const DebugEventInfo *info, bool asNotifi
} else if (asNotification) {
return GDB_SendNotificationPacket(ctx, buf, strlen(buf));
} else {
if (!(ctx->flags & GDB_FLAG_NONSTOP)) {
ctx->acknowledgedDebugEventCoreList |= BIT(info->coreId);
}
return GDB_SendPacket(ctx, buf, strlen(buf));
}
}
@ -210,14 +213,14 @@ int GDB_TrySignalDebugEvent(GDBContext *ctx, DebugEventInfo *info)
if (!GDB_IsAttached(ctx)) {
// Not attached, mark the event as handled, unpause
debugManagerMarkAndGetCoreDebugEvent(info->coreId);
debugManagerUnpauseCores(BIT(info->coreId), 0);
debugManagerUnpauseCores(BIT(info->coreId));
GDB_ReleaseContext(ctx);
return -1;
}
// Are we still paused & has the packet not been handled & are we allowed to send on our own?
if (ctx->sendOwnDebugEventAllowed && !info->handled && debugManagerIsCorePaused(info->coreId)) {
if (!ctx->sendOwnDebugEventDisallowed && !info->handled && debugManagerIsCorePaused(info->coreId)) {
bool nonStop = (ctx->flags & GDB_FLAG_NONSTOP) != 0;
info->handled = true;
@ -226,7 +229,7 @@ int GDB_TrySignalDebugEvent(GDBContext *ctx, DebugEventInfo *info)
debugManagerPauseCores(ctx->attachedCoreList & ~BIT(info->coreId));
}
ctx->sendOwnDebugEventAllowed = false;
ctx->sendOwnDebugEventDisallowed = true;
ret = GDB_SendStopReply(ctx, info, nonStop);
}
@ -249,16 +252,21 @@ GDB_DECLARE_VERBOSE_HANDLER(Stopped)
u32 coreList = debugManagerGetPausedCoreList() & ctx->attachedCoreList;
u32 remaining = coreList & ~ctx->sentDebugEventCoreList;
// Ack
if (ctx->lastDebugEvent != NULL) {
ctx->acknowledgedDebugEventCoreList |= BIT(ctx->lastDebugEvent->coreId);
}
if (remaining != 0) {
// Send one more debug event (marking it as handled)
u32 coreId = __builtin_ctz(remaining);
DebugEventInfo *info = debugManagerMarkAndGetCoreDebugEvent(coreId);
ctx->sendOwnDebugEventAllowed = false;
ctx->sendOwnDebugEventDisallowed = true;
return GDB_SendStopReply(ctx, info, false);
} else {
// vStopped sequenced finished
ctx->sendOwnDebugEventAllowed = true;
ctx->sendOwnDebugEventDisallowed = false;
return GDB_ReplyOk(ctx);
}
}
@ -272,7 +280,9 @@ GDB_DECLARE_HANDLER(GetStopReason)
} else {
// Non-stop, start new vStopped sequence
ctx->sentDebugEventCoreList = 0;
ctx->sendOwnDebugEventAllowed = false;
ctx->acknowledgedDebugEventCoreList = 0;
ctx->lastDebugEvent = NULL;
ctx->sendOwnDebugEventDisallowed = true;
return GDB_HandleVerboseStopped(ctx);
}
}
@ -347,8 +357,9 @@ GDB_DECLARE_HANDLER(ContinueOrStepDeprecated)
debugManagerSetSteppingRange(coreId, 0, 0);
}
debugManagerSetSingleStepCoreList(ssMask);
debugManagerUnpauseCores(coreList);
u32 mask = ctx->acknowledgedDebugEventCoreList;
debugManagerSetSingleStepCoreList(ssMask & mask);
debugManagerUnpauseCores(coreList & mask);
return 0;
}
@ -462,9 +473,13 @@ GDB_DECLARE_VERBOSE_HANDLER(Continue)
cmd = nextCmd;
}
debugManagerSetSingleStepCoreList(stepCoreList);
debugManagerBreakCores(stopCoreList);
debugManagerContinueCores(continueCoreList);
// "Note: In non-stop mode, a thread is considered running until GDB acknowledges
// an asynchronous stop notification for it with the ‘vStopped’ packet (see Remote Non-Stop)."
u32 mask = ctx->acknowledgedDebugEventCoreList;
debugManagerSetSingleStepCoreList(stepCoreList & mask);
debugManagerBreakCores(stopCoreList & ~mask);
debugManagerContinueCores(continueCoreList & mask);
return 0;
}