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authorRusty Lynch <rusty.lynch@intel.com>2005-06-23 00:09:25 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:21 -0700
commit7e1048b11c5afe79aac46a42e3ccec86b8365c6d (patch)
tree4f9caee0153e688f22d7e7b6fdc62e35be4fc3fe /include/linux/kprobes.h
parent73649dab0fd524cb8545a8cb83c6eaf77b107105 (diff)
downloadop-kernel-dev-7e1048b11c5afe79aac46a42e3ccec86b8365c6d.zip
op-kernel-dev-7e1048b11c5afe79aac46a42e3ccec86b8365c6d.tar.gz
[PATCH] Move kprobe [dis]arming into arch specific code
The architecture independent code of the current kprobes implementation is arming and disarming kprobes at registration time. The problem is that the code is assuming that arming and disarming is a just done by a simple write of some magic value to an address. This is problematic for ia64 where our instructions look more like structures, and we can not insert break points by just doing something like: *p->addr = BREAKPOINT_INSTRUCTION; The following patch to 2.6.12-rc4-mm2 adds two new architecture dependent functions: * void arch_arm_kprobe(struct kprobe *p) * void arch_disarm_kprobe(struct kprobe *p) and then adds the new functions for each of the architectures that already implement kprobes (spar64/ppc64/i386/x86_64). I thought arch_[dis]arm_kprobe was the most descriptive of what was really happening, but each of the architectures already had a disarm_kprobe() function that was really a "disarm and do some other clean-up items as needed when you stumble across a recursive kprobe." So... I took the liberty of changing the code that was calling disarm_kprobe() to call arch_disarm_kprobe(), and then do the cleanup in the block of code dealing with the recursive kprobe case. So far this patch as been tested on i386, x86_64, and ppc64, but still needs to be tested in sparc64. Signed-off-by: Rusty Lynch <rusty.lynch@intel.com> Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/kprobes.h')
-rw-r--r--include/linux/kprobes.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index fba39f8..0f90466 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -165,6 +165,8 @@ static inline int kprobe_running(void)
extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_copy_kprobe(struct kprobe *p);
+extern void arch_arm_kprobe(struct kprobe *p);
+extern void arch_disarm_kprobe(struct kprobe *p);
extern void arch_remove_kprobe(struct kprobe *p);
extern void show_registers(struct pt_regs *regs);
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