From b556b35e98ad2b9174a7a623d152cdf412d1a999 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 11 Jan 2006 22:43:00 +0100 Subject: [PATCH] x86_64: Move int 3 handler to debug stack and allow to increase it. This - switches the INT3 handler to run on an IST stack (to cope with breakpoints set by a kernel debugger on places where the kernel's %gs base hasn't been set up, yet); the IST stack used is shared with the INT1 handler's [AK: this also allows setting a kprobe on the interrupt/exception entry points] - allows nesting of INT1/INT3 handlers so that one can, with a kernel debugger, debug (at least) the user-mode portions of the INT1/INT3 handling; the nesting isn't actively enabled here since a kernel- debugger-free kernel doesn't need it Signed-Off-By: Jan Beulich Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/processor.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/asm-x86_64/processor.h') diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h index 4861246548f7..5cb151538cd5 100644 --- a/include/asm-x86_64/processor.h +++ b/include/asm-x86_64/processor.h @@ -273,8 +273,6 @@ struct thread_struct { #define DEBUG_STACK 4 #define MCE_STACK 5 #define N_EXCEPTION_STACKS 5 /* hw limit: 7 */ -#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER) -#define EXCEPTION_STACK_ORDER 0 #define start_thread(regs,new_rip,new_rsp) do { \ asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \ -- cgit v1.2.3