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authorLinus Torvalds <torvalds@linux-foundation.org>2013-11-14 07:25:10 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-14 07:25:10 (GMT)
commit7971e23a66c94f1b9bd2d64a3e86dfbfa8c60121 (patch)
tree20ff577e437ac6c361335151ce6b4c59bc72de02 /arch/x86/mm
parentf0d55cc1a65852e6647d4f5d707c1c9b5471ce3c (diff)
parenta4f61dec55c1bdebb84ba77212ebf98f7247736c (diff)
Merge branch 'x86-trace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/trace changes from Ingo Molnar: "This adds page fault tracepoints which have zero runtime cost in the disabled case via IDT trickery (no NOPs in the page fault hotpath)" * 'x86-trace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, trace: Change user|kernel_page_fault to page_fault_user|kernel x86, trace: Add page fault tracepoints x86, trace: Delete __trace_alloc_intr_gate() x86, trace: Register exception handler to trace IDT x86, trace: Remove __alloc_intr_gate()
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/Makefile2
-rw-r--r--arch/x86/mm/fault.c23
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 23d8e5f..6a19ad9 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -6,6 +6,8 @@ nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_physaddr.o := $(nostackp)
CFLAGS_setup_nx.o := $(nostackp)
+CFLAGS_fault.o := -I$(src)/../include/asm/trace
+
obj-$(CONFIG_X86_PAT) += pat_rbtree.o
obj-$(CONFIG_SMP) += tlb.o
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 7a517bb..1560a5d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -20,6 +20,9 @@
#include <asm/kmemcheck.h> /* kmemcheck_*(), ... */
#include <asm/fixmap.h> /* VSYSCALL_START */
+#define CREATE_TRACE_POINTS
+#include <asm/trace/exceptions.h>
+
/*
* Page fault error code bits:
*
@@ -1232,3 +1235,23 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
__do_page_fault(regs, error_code);
exception_exit(prev_state);
}
+
+static void trace_page_fault_entries(struct pt_regs *regs,
+ unsigned long error_code)
+{
+ if (user_mode(regs))
+ trace_page_fault_user(read_cr2(), regs, error_code);
+ else
+ trace_page_fault_kernel(read_cr2(), regs, error_code);
+}
+
+dotraplinkage void __kprobes
+trace_do_page_fault(struct pt_regs *regs, unsigned long error_code)
+{
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
+ trace_page_fault_entries(regs, error_code);
+ __do_page_fault(regs, error_code);
+ exception_exit(prev_state);
+}

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