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| author | Vegard Nossum <vegard.nossum@gmail.com> | 2008-04-03 22:53:23 (GMT) |
|---|---|---|
| committer | Vegard Nossum <vegard.nossum@gmail.com> | 2009-06-15 10:40:02 (GMT) |
| commit | f85612967c93b67b10dd240e3e8bf8a0eee9def7 (patch) | |
| tree | 184a70bc888b35235ee0b1805a06f90fd45295d8 /arch/x86/kernel/traps.c | |
| parent | f8b4ece2a94693b7d2dd32ea716cb92545b5dce6 (diff) | |
| download | linux-f85612967c93b67b10dd240e3e8bf8a0eee9def7.tar.xz | |
x86: add hooks for kmemcheck
The hooks that we modify are:
- Page fault handler (to handle kmemcheck faults)
- Debug exception handler (to hide pages after single-stepping
the instruction that caused the page fault)
Also redefine memset() to use the optimized version if kmemcheck is
enabled.
(Thanks to Pekka Enberg for minimizing the impact on the page fault
handler.)
As kmemcheck doesn't handle MMX/SSE instructions (yet), we also disable
the optimized xor code, and rely instead on the generic C implementation
in order to avoid false-positive warnings.
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
[whitespace fixlet]
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 07d60c8..e7a28e6 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -45,6 +45,7 @@ #include <linux/edac.h> #endif +#include <asm/kmemcheck.h> #include <asm/stacktrace.h> #include <asm/processor.h> #include <asm/debugreg.h> @@ -534,6 +535,10 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code) get_debugreg(condition, 6); + /* Catch kmemcheck conditions first of all! */ + if (condition & DR_STEP && kmemcheck_trap(regs)) + return; + /* * The processor cleared BTF, so don't mark that we need it set. */ |