risu: add header to trace stream

I've also added a header packet with pc/risu op in it so we can keep
better track of how things are going.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
[PMM: flipped header check to early-bailout so diff is easier
 to read]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20170621154244.28309-6-alex.bennee@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/risu.h b/risu.h
index 8eb6227..9f15662 100644
--- a/risu.h
+++ b/risu.h
@@ -55,6 +55,11 @@ extern int test_fp_exc;
  */
 struct reginfo;
 
+typedef struct {
+   uintptr_t pc;
+   uint32_t risu_op;
+} trace_header_t;
+
 /* Functions operating on reginfo */
 
 /* Function prototypes for read/write helper functions.
@@ -108,6 +113,9 @@ uint64_t get_reginfo_paramreg(struct reginfo *ri);
  */
 int get_risuop(struct reginfo *ri);
 
+/* Return the PC from a reginfo */
+uintptr_t get_pc(struct reginfo *ri);
+
 /* initialize structure from a ucontext */
 void reginfo_init(struct reginfo *ri, ucontext_t *uc);