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| author | Jan Beulich <jbeulich@novell.com> | 2006-01-11 22:43:00 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:01:13 -0800 |
| commit | b556b35e98ad2b9174a7a623d152cdf412d1a999 (patch) | |
| tree | 10f99d70e719fba811dee85d2f3a82b26d7a4ce8 /include/asm-x86_64/processor.h | |
| parent | ed8388a5d9db0445322f86ee8381b0f04a2057ee (diff) | |
| download | lwn-b556b35e98ad2b9174a7a623d152cdf412d1a999.tar.gz lwn-b556b35e98ad2b9174a7a623d152cdf412d1a999.zip | |
[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 <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/processor.h')
| -rw-r--r-- | include/asm-x86_64/processor.h | 2 |
1 files changed, 0 insertions, 2 deletions
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)); \ |