From 8edd7e37aed8b9df938a63f0b0259c70569ce3d2 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 25 Feb 2020 23:16:16 +0100 Subject: x86/entry: Convert INT3 exception to IDTENTRY_RAW Convert #BP to IDTENTRY_RAW: - Implement the C entry point with DEFINE_IDTENTRY_RAW - Invoke idtentry_enter/exit() from the function body - Emit the ASM stub with DECLARE_IDTENTRY_RAW - Remove the ASM idtentry in 64bit - Remove the open coded ASM entry code in 32bit - Fixup the XEN/PV code - Remove the old prototypes No functional change. This could be a plain IDTENTRY, but as Peter pointed out INT3 is broken vs. the static key in the context tracking code as this static key might be in the state of being patched and has an int3 which would recurse forever. IDTENTRY_RAW is therefore chosen to allow addressing this issue without lots of code churn. Signed-off-by: Thomas Gleixner Reviewed-by: Alexandre Chartre Acked-by: Peter Zijlstra Acked-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200505135313.938474960@linutronix.de --- arch/x86/entry/entry_64.S | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/x86/entry/entry_64.S') diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1bada7b26210..69ddd052aef2 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1072,8 +1072,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt * Exception entry points. */ -idtentry X86_TRAP_BP int3 do_int3 has_error_code=0 - idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1 #ifdef CONFIG_X86_MCE -- cgit v1.2.3