x86/mpx: Trace #BR exceptions

This is the first in a series of MPX tracing patches.
I've found these extremely useful in the process of
debugging applications and the kernel code itself.

This exception hooks in to the bounds (#BR) exception
very early and allows capturing the key registers which
would influence how the exception is handled.

Note that bndcfgu/bndstatus are technically still
64-bit registers even in 32-bit mode.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183703.5FE2619A@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 55 insertions, 0 deletions

diff --git a/arch/x86/include/asm/trace/mpx.h b/arch/x86/include/asm/trace/mpx.h
new file mode 100644
index 000000000000..5c03ec8a90d6
--- /dev/null
+++ b/arch/x86/include/asm/trace/mpx.h
@@ -0,0 +1,50 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mpx
+
+#if !defined(_TRACE_MPX_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MPX_H
+
+#include <linux/tracepoint.h>
+
+#ifdef CONFIG_X86_INTEL_MPX
+
+TRACE_EVENT(bounds_exception_mpx,
+
+        TP_PROTO(const struct bndcsr *bndcsr),
+        TP_ARGS(bndcsr),
+
+        TP_STRUCT__entry(
+                __field(u64, bndcfgu)
+                __field(u64, bndstatus)
+        ),
+
+        TP_fast_assign(
+                /* need to get rid of the 'const' on bndcsr */
+                __entry->bndcfgu   = (u64)bndcsr->bndcfgu;
+                __entry->bndstatus = (u64)bndcsr->bndstatus;
+        ),
+
+        TP_printk("bndcfgu:0x%llx bndstatus:0x%llx",
+                __entry->bndcfgu,
+                __entry->bndstatus)
+);
+
+#else
+
+/*
+ * This gets used outside of MPX-specific code, so we need a stub.
+ */
+static inline void trace_bounds_exception_mpx(const struct bndcsr *bndcsr)
+{
+}
+
+#endif /* CONFIG_X86_INTEL_MPX */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH asm/trace/
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE mpx
+#endif /* _TRACE_MPX_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index cffff669be3f..36cb15b7b367 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -60,6 +60,7 @@
 #include <asm/mach_traps.h>
 #include <asm/alternative.h>
 #include <asm/fpu/xstate.h>
+#include <asm/trace/mpx.h>
 #include <asm/mpx.h>
 
 #ifdef CONFIG_X86_64
@@ -399,6 +400,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
         if (!bndcsr)
                 goto exit_trap;
 
+        trace_bounds_exception_mpx(bndcsr);
         /*
          * The error code field of the BNDSTATUS register communicates status
          * information of a bound range exception #BR or operation involving
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index d6e02f3adee0..1fef52c17fc8 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -17,6 +17,9 @@
 #include <asm/processor.h>
 #include <asm/fpu/internal.h>
 
+#define CREATE_TRACE_POINTS
+#include <asm/trace/mpx.h>
+
 static const char *mpx_mapping_name(struct vm_area_struct *vma)
 {
         return "[mpx]";