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fix: semaphore syscalls return sid on success instead of KE_OK #136

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fix: semaphore syscalls return sid on success instead of KE_OK #136

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0a5e0af
fix: semaphore syscalls return sid on success instead of KE_OK
smmathews Jun 19, 2026
cb28e1a
fix: update stale KE_OK assertions in expansion and SIF RPC tests
smmathews Jun 20, 2026
e6bf596
fix: tighten WaitSema count-decrement guard to ret == sid
smmathews Jun 20, 2026
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14 changes: 8 additions & 6 deletions ps2xRuntime/src/lib/Kernel/Syscalls/Sync.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -218,7 +218,8 @@ namespace ps2_syscalls
}
sema->cv.notify_all();

setReturnS32(ctx, KE_OK);
// PS2 EE BIOS returns sid on success.
setReturnS32(ctx, sid);
}

void iDeleteSema(uint8_t *rdram, R5900Context *ctx, PS2Runtime *runtime)
Expand All @@ -236,7 +237,8 @@ namespace ps2_syscalls
return;
}

int ret = KE_OK;
// PS2 EE BIOS returns sid on success; KE_SEMA_OVF overrides on overflow.
int ret = sid;
int beforeCount = 0;
int afterCount = 0;
{
Expand Down Expand Up @@ -286,7 +288,7 @@ namespace ps2_syscalls
auto info = ensureCurrentThreadInfo(ctx);
throwIfTerminated(info);
std::unique_lock<std::mutex> lock(sema->m);
int ret = 0;
int ret = sid; // PS2 EE BIOS returns sid on success.

if (sema->count == 0)
{
Expand Down Expand Up @@ -318,7 +320,7 @@ namespace ps2_syscalls
{
bool forced = info ? info->forceRelease.load() : false;
bool terminated = info ? info->terminated.load() : false;
return sema->count > 0 || sema->deleted || forced || terminated; //
return sema->count > 0 || sema->deleted || forced || terminated;
});
}
sema->waiters--;
Expand Down Expand Up @@ -346,7 +348,7 @@ namespace ps2_syscalls
}
}

if (ret == 0 && sema->count > 0)
if (ret == sid && sema->count > 0)
{
sema->count--;
}
Expand Down Expand Up @@ -380,7 +382,7 @@ namespace ps2_syscalls
if (sema->count > 0)
{
sema->count--;
setReturnS32(ctx, KE_OK);
setReturnS32(ctx, sid); // PS2 EE BIOS returns sid on success.
return;
}

Expand Down
4 changes: 2 additions & 2 deletions ps2xTest/src/ps2_runtime_expansion_tests.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -942,7 +942,7 @@ void register_ps2_runtime_expansion_tests()
R5900Context pollCtx{};
setRegU32(pollCtx, 4, static_cast<uint32_t>(sid));
PollSema(rdram.data(), &pollCtx, &runtime);
if (getRegS32(pollCtx, 2) == KE_OK)
if (getRegS32(pollCtx, 2) == sid)
{
pollOkCount.fetch_add(1, std::memory_order_relaxed);
}
Expand All @@ -963,7 +963,7 @@ void register_ps2_runtime_expansion_tests()
R5900Context signalCtx{};
setRegU32(signalCtx, 4, static_cast<uint32_t>(sid));
SignalSema(rdram.data(), &signalCtx, &runtime);
if (getRegS32(signalCtx, 2) == KE_OK)
if (getRegS32(signalCtx, 2) == sid)
{
signalOkCount.fetch_add(1, std::memory_order_relaxed);
}
Expand Down
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