yuzu/src/core/hle/kernel/svc/svc_lock.cpp

// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "core/core.h"
#include "core/hle/kernel/k_memory_layout.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/svc.h"

namespace Kernel::Svc {

/// Attempts to locks a mutex
Result ArbitrateLock(Core::System& system, Handle thread_handle, VAddr address, u32 tag) {
    LOG_TRACE(Kernel_SVC, "called thread_handle=0x{:08X}, address=0x{:X}, tag=0x{:08X}",
              thread_handle, address, tag);

    // Validate the input address.
    if (IsKernelAddress(address)) {
        LOG_ERROR(Kernel_SVC, "Attempting to arbitrate a lock on a kernel address (address={:08X})",
                  address);
        return ResultInvalidCurrentMemory;
    }
    if (!Common::IsAligned(address, sizeof(u32))) {
        LOG_ERROR(Kernel_SVC, "Input address must be 4 byte aligned (address: {:08X})", address);
        return ResultInvalidAddress;
    }

    return GetCurrentProcess(system.Kernel()).WaitForAddress(thread_handle, address, tag);
}

/// Unlock a mutex
Result ArbitrateUnlock(Core::System& system, VAddr address) {
    LOG_TRACE(Kernel_SVC, "called address=0x{:X}", address);

    // Validate the input address.
    if (IsKernelAddress(address)) {
        LOG_ERROR(Kernel_SVC,
                  "Attempting to arbitrate an unlock on a kernel address (address={:08X})",
                  address);
        return ResultInvalidCurrentMemory;
    }
    if (!Common::IsAligned(address, sizeof(u32))) {
        LOG_ERROR(Kernel_SVC, "Input address must be 4 byte aligned (address: {:08X})", address);
        return ResultInvalidAddress;
    }

    return GetCurrentProcess(system.Kernel()).SignalToAddress(address);
}

Result ArbitrateLock64(Core::System& system, Handle thread_handle, uint64_t address, uint32_t tag) {
    R_RETURN(ArbitrateLock(system, thread_handle, address, tag));
}

Result ArbitrateUnlock64(Core::System& system, uint64_t address) {
    R_RETURN(ArbitrateUnlock(system, address));
}

Result ArbitrateLock64From32(Core::System& system, Handle thread_handle, uint32_t address,
                             uint32_t tag) {
    R_RETURN(ArbitrateLock(system, thread_handle, address, tag));
}

Result ArbitrateUnlock64From32(Core::System& system, uint32_t address) {
    R_RETURN(ArbitrateUnlock(system, address));
}

} // namespace Kernel::Svc