[RISU v2 13/17] Split RES_MISMATCH for registers and memory

[Richard Henderson <richard.henderson@linaro.org>]

By remembering the specific comparison that failed, we do not
have to try again when it comes time to report.  This makes
the mem_used flag redundant.  Also, packet_mismatch is now
redundant with RES_BAD_IO.

This means that the only thing that report_match_status does
is to report on register status, so rename to report_mismatch_reg.
Also, we know there is a failure, so don't return a status from
the report.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 risu.h    | 13 ++++++-------
 reginfo.c | 45 ++++++++-------------------------------------
 risu.c    | 10 +++++++---
 3 files changed, 21 insertions(+), 47 deletions(-)

diff --git a/risu.h b/risu.h
index 2ded5c4..b234f93 100644
--- a/risu.h
+++ b/risu.h
@@ -54,7 +54,8 @@ typedef enum {
 typedef enum {
     RES_OK = 0,
     RES_END,
-    RES_MISMATCH,
+    RES_MISMATCH_REG,
+    RES_MISMATCH_MEM,
     RES_BAD_IO,
 } RisuResult;
 
@@ -105,13 +106,11 @@ RisuResult send_register_info(void *uc);
  */
 RisuResult recv_and_compare_register_info(void *uc);
 
-/* Print a useful report on the status of the last comparison
- * done in recv_and_compare_register_info(). This is called on
- * exit, so need not restrict itself to signal-safe functions.
- * Should return 0 if it was a good match (ie end of test)
- * and 1 for a mismatch.
+/*
+ * Print a useful report on the status of the last reg comparison
+ * done in recv_and_compare_register_info().
  */
-int report_match_status(void);
+void report_mismatch_reg(void);
 
 /* Interface provided by CPU-specific code: */
 
diff --git a/reginfo.c b/reginfo.c
index 31bc699..a007f16 100644
--- a/reginfo.c
+++ b/reginfo.c
@@ -17,9 +17,6 @@
 static struct reginfo master_ri, apprentice_ri;
 static uint8_t master_memblock[MEMBLOCKLEN];
 
-static int mem_used;
-static int packet_mismatch;
-
 RisuResult send_register_info(void *uc)
 {
     struct reginfo ri;
@@ -107,10 +104,10 @@ RisuResult recv_and_compare_register_info(void *uc)
          */
         res = read_buffer(&master_ri, reginfo_size());
         if (res != RES_OK) {
-            packet_mismatch = 1;
+            /* fail */
         } else if (!reginfo_is_eq(&master_ri, &apprentice_ri)) {
             /* register mismatch */
-            res = RES_MISMATCH;
+            res = RES_MISMATCH_REG;
         } else if (op == OP_TESTEND) {
             res = RES_END;
         }
@@ -124,13 +121,12 @@ RisuResult recv_and_compare_register_info(void *uc)
                               (uintptr_t)memblock);
         break;
     case OP_COMPAREMEM:
-        mem_used = 1;
         res = read_buffer(master_memblock, MEMBLOCKLEN);
         if (res != RES_OK) {
-            packet_mismatch = 1;
+            /* fail */
         } else if (memcmp(memblock, master_memblock, MEMBLOCKLEN) != 0) {
             /* memory mismatch */
-            res = RES_MISMATCH;
+            res = RES_MISMATCH_MEM;
         }
         respond(res == RES_OK ? RES_OK : RES_END);
         break;
@@ -141,40 +137,15 @@ RisuResult recv_and_compare_register_info(void *uc)
     return res;
 }
 
-/* Print a useful report on the status of the last comparison
- * done in recv_and_compare_register_info(). This is called on
- * exit, so need not restrict itself to signal-safe functions.
- * Should return 0 if it was a good match (ie end of test)
- * and 1 for a mismatch.
+/*
+ * Print a useful report on the status of the last reg comparison
+ * done in recv_and_compare_register_info().
  */
-int report_match_status(void)
+void report_mismatch_reg(void)
 {
-    int resp = 0;
-    fprintf(stderr, "match status...\n");
-    if (packet_mismatch) {
-        fprintf(stderr, "packet mismatch (probably disagreement "
-                "about UNDEF on load/store)\n");
-        return 1;
-    }
-    if (!reginfo_is_eq(&master_ri, &apprentice_ri)) {
-        fprintf(stderr, "mismatch on regs!\n");
-        resp = 1;
-    }
-    if (mem_used
-        && memcmp(memblock, &master_memblock, MEMBLOCKLEN) != 0) {
-        fprintf(stderr, "mismatch on memory!\n");
-        resp = 1;
-    }
-    if (!resp) {
-        fprintf(stderr, "match!\n");
-        return 0;
-    }
-
     fprintf(stderr, "master reginfo:\n");
     reginfo_dump(&master_ri, stderr);
     fprintf(stderr, "apprentice reginfo:\n");
     reginfo_dump(&apprentice_ri, stderr);
-
     reginfo_dump_mismatch(&master_ri, &apprentice_ri, stderr);
-    return resp;
 }
diff --git a/risu.c b/risu.c
index ea4b4d3..398faac 100644
--- a/risu.c
+++ b/risu.c
@@ -224,9 +224,13 @@ static int apprentice(void)
     case RES_END:
         return EXIT_SUCCESS;
 
-    case RES_MISMATCH:
-        fprintf(stderr, "mismatch after %zd checkpoints\n", signal_count);
-        report_match_status();
+    case RES_MISMATCH_REG:
+        fprintf(stderr, "mismatch reg after %zd checkpoints\n", signal_count);
+        report_mismatch_reg();
+        return EXIT_FAILURE;
+
+    case RES_MISMATCH_MEM:
+        fprintf(stderr, "mismatch mem after %zd checkpoints\n", signal_count);
         return EXIT_FAILURE;
 
     case RES_BAD_IO:
-- 
2.20.1