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06ea58c7fa
Atmosphere-libs/libmesosphere/include/mesosphere/arch/arm64/kern_k_thread_context.hpp
Michael Scire 06ea58c7fa ams: mark ams::Result [[nodiscard]] (partially complete). 
NOTE: This work is not yet fully complete; kernel is done, but
it was taking an exceedingly long time to get through libstratosphere.
Thus, I've temporarily added -Wno-error=unused-result for libstratosphere/stratosphere.

All warnings should be fixed to do the same thing Nintendo does as relevant, but this
is taking a phenomenally long time and is not actually the most important work to do,
so it can be put off for some time to prioritize other tasks for 21.0.0 support.
2025-11-15 12:57:42 -07:00

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/*
* 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/>.
*/
#pragma once
#include <mesosphere/kern_common.hpp>
#include <mesosphere/kern_k_typed_address.hpp>
namespace ams::kern {
class KThread;
}
namespace ams::kern::arch::arm64 {
class KThreadContext {
public:
static constexpr size_t NumCalleeSavedRegisters = (29 - 19) + 1;
static constexpr size_t NumCalleeSavedFpuRegisters = 8;
static constexpr size_t NumCallerSavedFpuRegisters = 24;
static constexpr size_t NumFpuRegisters = NumCalleeSavedFpuRegisters + NumCallerSavedFpuRegisters;
public:
union CalleeSaveRegisters {
u64 registers[NumCalleeSavedRegisters];
struct {
u64 x19;
u64 x20;
u64 x21;
u64 x22;
u64 x23;
u64 x24;
u64 x25;
u64 x26;
u64 x27;
u64 x28;
u64 x29;
};
};
union CalleeSaveFpu64Registers {
u128 v[NumCalleeSavedFpuRegisters];
struct {
u128 q8;
u128 q9;
u128 q10;
u128 q11;
u128 q12;
u128 q13;
u128 q14;
u128 q15;
};
};
union CalleeSaveFpu32Registers {
u128 v[NumCalleeSavedFpuRegisters / 2];
struct {
u128 q4;
u128 q5;
u128 q6;
u128 q7;
};
};
union CalleeSaveFpuRegisters {
CalleeSaveFpu64Registers fpu64;
CalleeSaveFpu32Registers fpu32;
};
union CallerSaveFpu64Registers {
u128 v[NumCallerSavedFpuRegisters];
struct {
union {
u128 v0_7[NumCallerSavedFpuRegisters / 3];
struct {
u128 q0;
u128 q1;
u128 q2;
u128 q3;
u128 q4;
u128 q5;
u128 q6;
u128 q7;
};
};
union {
u128 v16_31[2 * NumCallerSavedFpuRegisters / 3];
struct {
u128 q16;
u128 q17;
u128 q18;
u128 q19;
u128 q20;
u128 q21;
u128 q22;
u128 q23;
u128 q24;
u128 q25;
u128 q26;
u128 q27;
u128 q28;
u128 q29;
u128 q30;
u128 q31;
};
};
};
};
union CallerSaveFpu32Registers {
u128 v[NumCallerSavedFpuRegisters / 2];
struct {
union {
u128 v0_3[(NumCallerSavedFpuRegisters / 3) / 2];
struct {
u128 q0;
u128 q1;
u128 q2;
u128 q3;
};
};
union {
u128 v8_15[(2 * NumCallerSavedFpuRegisters / 3) / 2];
struct {
u128 q8;
u128 q9;
u128 q10;
u128 q11;
u128 q12;
u128 q13;
u128 q14;
u128 q15;
};
};
};
};
union CallerSaveFpuRegisters {
CallerSaveFpu64Registers fpu64;
CallerSaveFpu32Registers fpu32;
};
private:
CalleeSaveRegisters m_callee_saved;
u64 m_lr;
u64 m_sp;
u32 m_fpcr;
u32 m_fpsr;
alignas(0x10) CalleeSaveFpuRegisters m_callee_saved_fpu;
bool m_locked;
private:
static void RestoreFpuRegisters64(const KThreadContext &);
static void RestoreFpuRegisters32(const KThreadContext &);
public:
constexpr explicit KThreadContext(util::ConstantInitializeTag) : m_callee_saved(), m_lr(), m_sp(), m_fpcr(), m_fpsr(), m_callee_saved_fpu(), m_locked() { /* ... */ }
explicit KThreadContext() { /* ... */ }
void Initialize(KVirtualAddress u_pc, KVirtualAddress k_sp, KVirtualAddress u_sp, uintptr_t arg, bool is_user, bool is_64_bit, bool is_main);
void SetArguments(uintptr_t arg0, uintptr_t arg1);
static void FpuContextSwitchHandler(KThread *thread);
u32 GetFpcr() const { return m_fpcr; }
u32 GetFpsr() const { return m_fpsr; }
void SetFpcr(u32 v) { m_fpcr = v; }
void SetFpsr(u32 v) { m_fpsr = v; }
void CloneFpuStatus();
const auto &GetCalleeSaveFpuRegisters() const { return m_callee_saved_fpu; }
auto &GetCalleeSaveFpuRegisters() { return m_callee_saved_fpu; }
public:
static void OnThreadTerminating(const KThread *thread);
public:
static consteval bool ValidateOffsets();
template<typename CallerSave, typename CalleeSave> requires ((std::same_as<CallerSave, CallerSaveFpu64Registers> && std::same_as<CalleeSave, CalleeSaveFpu64Registers>) || (std::same_as<CallerSave, CallerSaveFpu32Registers> && std::same_as<CalleeSave, CalleeSaveFpu32Registers>))
static void GetFpuRegisters(u128 *out, const CallerSave &caller_save, const CalleeSave &callee_save) {
/* Check that the register counts are correct. */
constexpr size_t RegisterUnitCount = util::size(CalleeSave{}.v);
static_assert(util::size(CalleeSave{}.v) == 1 * RegisterUnitCount);
static_assert(util::size(CallerSave{}.v) == 3 * RegisterUnitCount);
/* Copy the low caller-save registers. */
for (size_t i = 0; i < RegisterUnitCount; ++i) {
*(out++) = caller_save.v[i];
}
/* Copy the callee-save registers. */
for (size_t i = 0; i < RegisterUnitCount; ++i) {
*(out++) = callee_save.v[i];
}
/* Copy the remaining caller-save registers. */
for (size_t i = 0; i < 2 * RegisterUnitCount; ++i) {
*(out++) = caller_save.v[RegisterUnitCount + i];
}
}
template<typename CallerSave, typename CalleeSave> requires ((std::same_as<CallerSave, CallerSaveFpu64Registers> && std::same_as<CalleeSave, CalleeSaveFpu64Registers>) || (std::same_as<CallerSave, CallerSaveFpu32Registers> && std::same_as<CalleeSave, CalleeSaveFpu32Registers>))
static ALWAYS_INLINE void SetFpuRegisters(CallerSave &caller_save, CalleeSave &callee_save, const u128 *v) {
/* Check that the register counts are correct. */
constexpr size_t RegisterUnitCount = util::size(CalleeSave{}.v);
static_assert(util::size(CalleeSave{}.v) == 1 * RegisterUnitCount);
static_assert(util::size(CallerSave{}.v) == 3 * RegisterUnitCount);
/* Copy the low caller-save registers. */
for (size_t i = 0; i < RegisterUnitCount; ++i) {
caller_save.v[i] = *(v++);
}
/* Copy the callee-save registers. */
for (size_t i = 0; i < RegisterUnitCount; ++i) {
callee_save.v[i] = *(v++);
}
/* Copy the remaining caller-save registers. */
for (size_t i = 0; i < 2 * RegisterUnitCount; ++i) {
caller_save.v[RegisterUnitCount + i] = *(v++);
}
}
};
consteval bool KThreadContext::ValidateOffsets() {
static_assert(sizeof(KThreadContext) == THREAD_CONTEXT_SIZE);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.registers) == THREAD_CONTEXT_CPU_REGISTERS);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x19) == THREAD_CONTEXT_X19);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x20) == THREAD_CONTEXT_X20);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x21) == THREAD_CONTEXT_X21);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x22) == THREAD_CONTEXT_X22);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x23) == THREAD_CONTEXT_X23);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x24) == THREAD_CONTEXT_X24);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x25) == THREAD_CONTEXT_X25);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x26) == THREAD_CONTEXT_X26);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x27) == THREAD_CONTEXT_X27);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x28) == THREAD_CONTEXT_X28);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved.x29) == THREAD_CONTEXT_X29);
static_assert(AMS_OFFSETOF(KThreadContext, m_lr) == THREAD_CONTEXT_LR);
static_assert(AMS_OFFSETOF(KThreadContext, m_sp) == THREAD_CONTEXT_SP);
static_assert(AMS_OFFSETOF(KThreadContext, m_fpcr) == THREAD_CONTEXT_FPCR);
static_assert(AMS_OFFSETOF(KThreadContext, m_fpsr) == THREAD_CONTEXT_FPSR);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu) == THREAD_CONTEXT_FPU_REGISTERS);
static_assert(AMS_OFFSETOF(KThreadContext, m_locked) == THREAD_CONTEXT_LOCKED);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q8 ) == THREAD_CONTEXT_FPU64_Q8 );
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q9 ) == THREAD_CONTEXT_FPU64_Q9 );
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q10) == THREAD_CONTEXT_FPU64_Q10);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q11) == THREAD_CONTEXT_FPU64_Q11);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q12) == THREAD_CONTEXT_FPU64_Q12);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q13) == THREAD_CONTEXT_FPU64_Q13);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q14) == THREAD_CONTEXT_FPU64_Q14);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu64.q15) == THREAD_CONTEXT_FPU64_Q15);
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu32.q4 ) == THREAD_CONTEXT_FPU32_Q4 );
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu32.q5 ) == THREAD_CONTEXT_FPU32_Q5 );
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu32.q6 ) == THREAD_CONTEXT_FPU32_Q6 );
static_assert(AMS_OFFSETOF(KThreadContext, m_callee_saved_fpu.fpu32.q7 ) == THREAD_CONTEXT_FPU32_Q7 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q0 ) == THREAD_FPU64_CONTEXT_Q0 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q1 ) == THREAD_FPU64_CONTEXT_Q1 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q2 ) == THREAD_FPU64_CONTEXT_Q2 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q3 ) == THREAD_FPU64_CONTEXT_Q3 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q4 ) == THREAD_FPU64_CONTEXT_Q4 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q5 ) == THREAD_FPU64_CONTEXT_Q5 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q6 ) == THREAD_FPU64_CONTEXT_Q6 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q7 ) == THREAD_FPU64_CONTEXT_Q7 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q16) == THREAD_FPU64_CONTEXT_Q16);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q17) == THREAD_FPU64_CONTEXT_Q17);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q18) == THREAD_FPU64_CONTEXT_Q18);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q19) == THREAD_FPU64_CONTEXT_Q19);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q20) == THREAD_FPU64_CONTEXT_Q20);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q21) == THREAD_FPU64_CONTEXT_Q21);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q22) == THREAD_FPU64_CONTEXT_Q22);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q23) == THREAD_FPU64_CONTEXT_Q23);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q24) == THREAD_FPU64_CONTEXT_Q24);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q25) == THREAD_FPU64_CONTEXT_Q25);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q26) == THREAD_FPU64_CONTEXT_Q26);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q27) == THREAD_FPU64_CONTEXT_Q27);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q28) == THREAD_FPU64_CONTEXT_Q28);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q29) == THREAD_FPU64_CONTEXT_Q29);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q30) == THREAD_FPU64_CONTEXT_Q30);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu64.q31) == THREAD_FPU64_CONTEXT_Q31);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q0 ) == THREAD_FPU32_CONTEXT_Q0 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q1 ) == THREAD_FPU32_CONTEXT_Q1 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q2 ) == THREAD_FPU32_CONTEXT_Q2 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q3 ) == THREAD_FPU32_CONTEXT_Q3 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q8 ) == THREAD_FPU32_CONTEXT_Q8 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q9 ) == THREAD_FPU32_CONTEXT_Q9 );
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q10) == THREAD_FPU32_CONTEXT_Q10);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q11) == THREAD_FPU32_CONTEXT_Q11);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q12) == THREAD_FPU32_CONTEXT_Q12);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q13) == THREAD_FPU32_CONTEXT_Q13);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q14) == THREAD_FPU32_CONTEXT_Q14);
static_assert(AMS_OFFSETOF(KThreadContext::CallerSaveFpuRegisters, fpu32.q15) == THREAD_FPU32_CONTEXT_Q15);
return true;
}
static_assert(KThreadContext::ValidateOffsets());
void GetUserContext(ams::svc::ThreadContext *out, const KThread *thread);
}
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