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kern: Implement exception vector ASM

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This commit is contained in:
Michael Scire
2020-02-08 02:49:32 -08:00
parent e330b6187f
commit 919b8124dc
26 changed files with 1497 additions and 60 deletions
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26
libraries/libmesosphere/source/arch/arm64/kern_k_thread_context.cpp
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@@ -27,6 +27,15 @@ namespace ams::kern::arm64 {
namespace {
ALWAYS_INLINE bool IsFpuEnabled() {
return cpu::ArchitecturalFeatureAccessControlRegisterAccessor().IsFpEnabled();
}
ALWAYS_INLINE void EnableFpu() {
cpu::ArchitecturalFeatureAccessControlRegisterAccessor().SetFpEnabled(true).Store();
cpu::InstructionMemoryBarrier();
}
uintptr_t SetupStackForUserModeThreadStarter(KVirtualAddress pc, KVirtualAddress k_sp, KVirtualAddress u_sp, uintptr_t arg, bool is_64_bit) {
/* NOTE: Stack layout on entry looks like following: */
/* SP */
@@ -128,4 +137,21 @@ namespace ams::kern::arm64 {
return ResultSuccess();
}
void KThreadContext::FpuContextSwitchHandler(KThread *thread) {
MESOSPHERE_ASSERT(!KInterruptManager::AreInterruptsEnabled());
MESOSPHERE_ASSERT(!IsFpuEnabled());
/* Enable the FPU. */
EnableFpu();
/* Restore the FPU registers. */
KProcess *process = thread->GetOwnerProcess();
MESOSPHERE_ASSERT(process != nullptr);
if (process->Is64Bit()) {
RestoreFpuRegisters64(*thread->GetContext());
} else {
RestoreFpuRegisters32(*thread->GetContext());
}
}
}