Add magic and size to the trace header

Sanity check that we're not getting out of sync with
the trace stream.  This will be especially bad with
the change in size of the sve save data.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220708154700.18682-18-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/risu.h b/risu.h
index dd9fda5..bfcf0af 100644
--- a/risu.h
+++ b/risu.h
@@ -55,7 +55,11 @@ typedef enum {
     RES_END,
     RES_MISMATCH_REG,
     RES_MISMATCH_MEM,
+    RES_MISMATCH_OP,
     RES_BAD_IO,
+    RES_BAD_MAGIC,
+    RES_BAD_SIZE,
+    RES_BAD_OP,
 } RisuResult;
 
 /* The memory block should be this long */
@@ -69,10 +73,14 @@ typedef enum {
 struct reginfo;
 
 typedef struct {
-   uintptr_t pc;
+   uint32_t magic;
+   uint32_t size;
    uint32_t risu_op;
+   uintptr_t pc;
 } trace_header_t;
 
+#define RISU_MAGIC  (('R' << 24) | ('I' << 16) | ('S' << 8) | 'U')
+
 /* Socket related routines */
 int master_connect(int port);
 int apprentice_connect(const char *hostname, int port);