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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/desc.h | |
parent | ed8388a5d9db0445322f86ee8381b0f04a2057ee (diff) | |
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[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/desc.h')
-rw-r--r-- | include/asm-x86_64/desc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h index 3376486..5ce0e34 100644 --- a/include/asm-x86_64/desc.h +++ b/include/asm-x86_64/desc.h @@ -114,6 +114,11 @@ static inline void set_system_gate(int nr, void *func) _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0); } +static inline void set_system_gate_ist(int nr, void *func, unsigned ist) +{ + _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist); +} + static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type, unsigned size) { |