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arm64: Save/restore FPU state when handling IRQ or syscall

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Change-Id: I8b2a36d57f410c0d06ca5ce90d1b997494072c94
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7510
Reviewed-by: waddlesplash <[email protected]>
Tested-by: Commit checker robot <[email protected]>
This commit is contained in:
milek7
2024-03-07 13:28:27 +00:00
committed by Fredrik Holmqvist
parent b6fd30b0ed
commit 06fae14eb9
2 changed files with 16 additions and 0 deletions
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headers/private/kernel/arch/arm64/arch_cpu.h
+3
View File
@@ -138,6 +138,9 @@ struct iframe {
// exception info // exception info
uint64 esr; uint64 esr;
uint64 far; uint64 far;
// fpu
struct aarch64_fpu_state fpu;
}; };
src/system/kernel/arch/arm64/arch_int.cpp
+13
View File
@@ -39,6 +39,11 @@
// threads yet. // threads yet.
struct iframe_stack gBootFrameStack; struct iframe_stack gBootFrameStack;
// In order to avoid store/restore of large FPU state, it is assumed that
// this code and page fault handling doesn't use FPU.
// Instead this is called manually when handling IRQ or syscall.
extern "C" void _fp_save(aarch64_fpu_state *fpu);
extern "C" void _fp_restore(aarch64_fpu_state *fpu);
void void
arch_int_enable_io_interrupt(int32 irq) arch_int_enable_io_interrupt(int32 irq)
@@ -340,6 +345,8 @@ do_sync_handler(iframe * frame)
} }
} }
_fp_save(&frame->fpu);
thread_at_kernel_entry(system_time()); thread_at_kernel_entry(system_time());
enable_interrupts(); enable_interrupts();
@@ -362,6 +369,8 @@ do_sync_handler(iframe * frame)
} }
} }
_fp_restore(&frame->fpu);
return; return;
} }
} }
@@ -393,11 +402,15 @@ do_irq_handler(iframe * frame)
IFrameScope scope(frame); IFrameScope scope(frame);
_fp_save(&frame->fpu);
InterruptController *ic = InterruptController::Get(); InterruptController *ic = InterruptController::Get();
if (ic != NULL) if (ic != NULL)
ic->HandleInterrupt(); ic->HandleInterrupt();
after_exception(); after_exception();
_fp_restore(&frame->fpu);
} }