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kern/svc: update WaitForAddress to support 64-bit WaitIfEqual

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This commit is contained in:
Michael Scire 2024-10-09 11:36:17 -07:00 committed by SciresM
parent 5de551db29
commit a0ad3ef949
11 changed files with 163 additions and 13 deletions
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1
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_userspace_memory_access.hpp
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@ -25,6 +25,7 @@ namespace ams::kern::arch::arm64 {
static bool CopyMemoryFromUser(void *dst, const void *src, size_t size);
static bool CopyMemoryFromUserAligned32Bit(void *dst, const void *src, size_t size);
static bool CopyMemoryFromUserAligned64Bit(void *dst, const void *src, size_t size);
static bool CopyMemoryFromUserSize64Bit(void *dst, const void *src);
static bool CopyMemoryFromUserSize32Bit(void *dst, const void *src);
static s32 CopyStringFromUser(void *dst, const void *src, size_t size);

11
libraries/libmesosphere/include/mesosphere/kern_k_address_arbiter.hpp
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@ -39,14 +39,16 @@ namespace ams::kern {
}
}
Result WaitForAddress(uintptr_t addr, ams::svc::ArbitrationType type, s32 value, s64 timeout) {
Result WaitForAddress(uintptr_t addr, ams::svc::ArbitrationType type, s64 value, s64 timeout) {
switch (type) {
case ams::svc::ArbitrationType_WaitIfLessThan:
R_RETURN(this->WaitIfLessThan(addr, value, false, timeout));
R_RETURN(this->WaitIfLessThan(addr, static_cast<s32>(value), false, timeout));
case ams::svc::ArbitrationType_DecrementAndWaitIfLessThan:
R_RETURN(this->WaitIfLessThan(addr, value, true, timeout));
R_RETURN(this->WaitIfLessThan(addr, static_cast<s32>(value), true, timeout));
case ams::svc::ArbitrationType_WaitIfEqual:
R_RETURN(this->WaitIfEqual(addr, value, timeout));
R_RETURN(this->WaitIfEqual(addr, static_cast<s32>(value), timeout));
case ams::svc::ArbitrationType_WaitIfEqual64:
R_RETURN(this->WaitIfEqual64(addr, value, timeout));
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
}
@ -56,6 +58,7 @@ namespace ams::kern {
Result SignalAndModifyByWaitingCountIfEqual(uintptr_t addr, s32 value, s32 count);
Result WaitIfLessThan(uintptr_t addr, s32 value, bool decrement, s64 timeout);
Result WaitIfEqual(uintptr_t addr, s32 value, s64 timeout);
Result WaitIfEqual64(uintptr_t addr, s64 value, s64 timeout);
};
}

2
libraries/libmesosphere/include/mesosphere/kern_k_process.hpp
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@ -360,7 +360,7 @@ namespace ams::kern {
R_RETURN(m_address_arbiter.SignalToAddress(address, signal_type, value, count));
}
Result WaitAddressArbiter(uintptr_t address, ams::svc::ArbitrationType arb_type, s32 value, s64 timeout) {
Result WaitAddressArbiter(uintptr_t address, ams::svc::ArbitrationType arb_type, s64 value, s64 timeout) {
R_RETURN(m_address_arbiter.WaitForAddress(address, arb_type, value, timeout));
}

14
libraries/libmesosphere/source/arch/arm64/kern_userspace_memory_access_asm.s
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@ -126,6 +126,20 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess30CopyMemoryFromUserAligned64BitEPvPKvm:
mov x0, #1
ret
/* ams::kern::arch::arm64::UserspaceAccess::CopyMemoryFromUserSize64Bit(void *dst, const void *src) */
.section .text._ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize64BitEPvPKv, "ax", %progbits
.global _ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize64BitEPvPKv
.type _ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize64BitEPvPKv, %function
.balign 0x10
_ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize64BitEPvPKv:
/* Just load and store a u64. */
ldtr x2, [x1]
str x2, [x0]
/* We're done. */
mov x0, #1
ret
/* ams::kern::arch::arm64::UserspaceAccess::CopyMemoryFromUserSize32Bit(void *dst, const void *src) */
.section .text._ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize32BitEPvPKv, "ax", %progbits
.global _ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize32BitEPvPKv

67
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_address_arbiter_asm.s Normal file
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@ -0,0 +1,67 @@
/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* ams::kern::svc::CallWaitForAddress64From32() */
.section .text._ZN3ams4kern3svc26CallWaitForAddress64From32Ev, "ax", %progbits
.global _ZN3ams4kern3svc26CallWaitForAddress64From32Ev
.type _ZN3ams4kern3svc26CallWaitForAddress64From32Ev, %function
_ZN3ams4kern3svc26CallWaitForAddress64From32Ev:
/* Save LR + callee-save registers. */
str x30, [sp, #-16]!
stp x6, x7, [sp, #-16]!
/* Gather the arguments into correct registers. */
/* NOTE: This has to be manually implemented via asm, */
/* in order to avoid breaking ABI with pre-19.0.0. */
orr x2, x2, x5, lsl#32
orr x3, x3, x4, lsl#32
/* Invoke the svc handler. */
bl _ZN3ams4kern3svc22WaitForAddress64From32ENS_3svc7AddressENS2_15ArbitrationTypeEll
/* Clean up registers. */
mov x1, xzr
mov x2, xzr
mov x3, xzr
mov x4, xzr
mov x5, xzr
ldp x6, x7, [sp], #0x10
ldr x30, [sp], #0x10
ret
/* ams::kern::svc::CallWaitForAddress64() */
.section .text._ZN3ams4kern3svc20CallWaitForAddress64Ev, "ax", %progbits
.global _ZN3ams4kern3svc20CallWaitForAddress64Ev
.type _ZN3ams4kern3svc20CallWaitForAddress64Ev, %function
_ZN3ams4kern3svc20CallWaitForAddress64Ev:
/* Save LR + FP. */
stp x29, x30, [sp, #-16]!
/* Invoke the svc handler. */
bl _ZN3ams4kern3svc22WaitForAddress64From32ENS_3svc7AddressENS2_15ArbitrationTypeEll
/* Clean up registers. */
mov x1, xzr
mov x2, xzr
mov x3, xzr
mov x4, xzr
mov x5, xzr
mov x6, xzr
mov x7, xzr
ldp x29, x30, [sp], #0x10
ret

8
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_tables.cpp
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@ -36,6 +36,10 @@ namespace ams::kern::svc {
/* Declare special prototype for (unsupported) CallCallSecureMonitor64From32. */
void CallCallSecureMonitor64From32();
/* Declare special prototypes for WaitForAddress. */
void CallWaitForAddress64();
void CallWaitForAddress64From32();
namespace {
#ifndef MESOSPHERE_USE_STUBBED_SVC_TABLES
@ -81,6 +85,8 @@ namespace ams::kern::svc {
table[svc::SvcId_CallSecureMonitor] = CallCallSecureMonitor64From32;
table[svc::SvcId_WaitForAddress] = CallWaitForAddress64From32;
return table;
}();
@ -97,6 +103,8 @@ namespace ams::kern::svc {
table[svc::SvcId_ReturnFromException] = CallReturnFromException64;
table[svc::SvcId_WaitForAddress] = CallWaitForAddress64;
return table;
}();

51
libraries/libmesosphere/source/kern_k_address_arbiter.cpp
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@ -23,6 +23,10 @@ namespace ams::kern {
return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
}
ALWAYS_INLINE bool ReadFromUser(s64 *out, KProcessAddress address) {
return UserspaceAccess::CopyMemoryFromUserSize64Bit(out, GetVoidPointer(address));
}
ALWAYS_INLINE bool DecrementIfLessThan(s32 *out, KProcessAddress address, s32 value) {
/* NOTE: If scheduler lock is not held here, interrupt disable is required. */
/* KScopedInterruptDisable di; */
@ -279,4 +283,51 @@ namespace ams::kern {
R_RETURN(cur_thread->GetWaitResult());
}
Result KAddressArbiter::WaitIfEqual64(uintptr_t addr, s64 value, s64 timeout) {
/* Prepare to wait. */
KThread *cur_thread = GetCurrentThreadPointer();
KHardwareTimer *timer;
ThreadQueueImplForKAddressArbiter wait_queue(std::addressof(m_tree));
{
KScopedSchedulerLockAndSleep slp(std::addressof(timer), cur_thread, timeout);
/* Check that the thread isn't terminating. */
if (cur_thread->IsTerminationRequested()) {
slp.CancelSleep();
R_THROW(svc::ResultTerminationRequested());
}
/* Read the value from userspace. */
s64 user_value;
if (!ReadFromUser(std::addressof(user_value), addr)) {
slp.CancelSleep();
R_THROW(svc::ResultInvalidCurrentMemory());
}
/* Check that the value is equal. */
if (value != user_value) {
slp.CancelSleep();
R_THROW(svc::ResultInvalidState());
}
/* Check that the timeout is non-zero. */
if (timeout == 0) {
slp.CancelSleep();
R_THROW(svc::ResultTimedOut());
}
/* Set the arbiter. */
cur_thread->SetAddressArbiter(std::addressof(m_tree), addr);
m_tree.insert(*cur_thread);
/* Wait for the thread to finish. */
wait_queue.SetHardwareTimer(timer);
cur_thread->BeginWait(std::addressof(wait_queue));
}
/* Get the wait result. */
R_RETURN(cur_thread->GetWaitResult());
}
}

11
libraries/libmesosphere/source/svc/kern_svc_address_arbiter.cpp
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@ -41,16 +41,21 @@ namespace ams::kern::svc {
case ams::svc::ArbitrationType_WaitIfLessThan:
case ams::svc::ArbitrationType_DecrementAndWaitIfLessThan:
case ams::svc::ArbitrationType_WaitIfEqual:
case ams::svc::ArbitrationType_WaitIfEqual64:
return true;
default:
return false;
}
}
Result WaitForAddress(uintptr_t address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
Result WaitForAddress(uintptr_t address, ams::svc::ArbitrationType arb_type, int64_t value, int64_t timeout_ns) {
/* Validate input. */
R_UNLESS(AMS_LIKELY(!IsKernelAddress(address)), svc::ResultInvalidCurrentMemory());
if (arb_type == ams::svc::ArbitrationType_WaitIfEqual64) {
R_UNLESS(util::IsAligned(address, sizeof(int64_t)), svc::ResultInvalidAddress());
} else {
R_UNLESS(util::IsAligned(address, sizeof(int32_t)), svc::ResultInvalidAddress());
}
R_UNLESS(IsValidArbitrationType(arb_type), svc::ResultInvalidEnumValue());
/* Convert timeout from nanoseconds to ticks. */
@ -85,7 +90,7 @@ namespace ams::kern::svc {
/* ============================= 64 ABI ============================= */
Result WaitForAddress64(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
Result WaitForAddress64(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int64_t value, int64_t timeout_ns) {
R_RETURN(WaitForAddress(address, arb_type, value, timeout_ns));
}
@ -95,7 +100,7 @@ namespace ams::kern::svc {
/* ============================= 64From32 ABI ============================= */
Result WaitForAddress64From32(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
Result WaitForAddress64From32(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int64_t value, int64_t timeout_ns) {
R_RETURN(WaitForAddress(address, arb_type, value, timeout_ns));
}

2
libraries/libstratosphere/include/stratosphere/svc/svc_stratosphere_shims.hpp
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@ -231,7 +231,7 @@
R_RETURN(::svcGetThreadContext3(reinterpret_cast<::ThreadContext *>(out_context.GetPointerUnsafe()), thread_handle));
}
ALWAYS_INLINE Result WaitForAddress(::ams::svc::Address address, ::ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
ALWAYS_INLINE Result WaitForAddress(::ams::svc::Address address, ::ams::svc::ArbitrationType arb_type, int64_t value, int64_t timeout_ns) {
R_RETURN(::svcWaitForAddress(reinterpret_cast<void *>(static_cast<uintptr_t>(address)), arb_type, value, timeout_ns));
}

2
libraries/libvapours/include/vapours/svc/svc_definition_macro.hpp
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@ -67,7 +67,7 @@
HANDLER(0x31, Result, GetResourceLimitCurrentValue, OUTPUT(int64_t, out_current_value), INPUT(::ams::svc::Handle, resource_limit_handle), INPUT(::ams::svc::LimitableResource, which)) \
HANDLER(0x32, Result, SetThreadActivity, INPUT(::ams::svc::Handle, thread_handle), INPUT(::ams::svc::ThreadActivity, thread_activity)) \
HANDLER(0x33, Result, GetThreadContext3, OUTPTR(::ams::svc::ThreadContext, out_context), INPUT(::ams::svc::Handle, thread_handle)) \
HANDLER(0x34, Result, WaitForAddress, INPUT(::ams::svc::Address, address), INPUT(::ams::svc::ArbitrationType, arb_type), INPUT(int32_t, value), INPUT(int64_t, timeout_ns)) \
HANDLER(0x34, Result, WaitForAddress, INPUT(::ams::svc::Address, address), INPUT(::ams::svc::ArbitrationType, arb_type), INPUT(int64_t, value), INPUT(int64_t, timeout_ns)) \
HANDLER(0x35, Result, SignalToAddress, INPUT(::ams::svc::Address, address), INPUT(::ams::svc::SignalType, signal_type), INPUT(int32_t, value), INPUT(int32_t, count)) \
HANDLER(0x36, void, SynchronizePreemptionState) \
HANDLER(0x37, Result, GetResourceLimitPeakValue, OUTPUT(int64_t, out_peak_value), INPUT(::ams::svc::Handle, resource_limit_handle), INPUT(::ams::svc::LimitableResource, which)) \

1
libraries/libvapours/include/vapours/svc/svc_types_common.hpp
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@ -263,6 +263,7 @@ namespace ams::svc {
ArbitrationType_WaitIfLessThan = 0,
ArbitrationType_DecrementAndWaitIfLessThan = 1,
ArbitrationType_WaitIfEqual = 2,
ArbitrationType_WaitIfEqual64 = 3,
};
enum YieldType : s64 {