[v2,03/13] contrib/elf2dmp: Continue even contexts are lacking

Commit Message

Akihiko Odaki March 5, 2024, 7:36 a.m. UTC

Let fill_context() continue even if it fails to fill contexts of some
CPUs. A dump may still contain valuable information even if it lacks
contexts of some CPUs due to dump corruption or a failure before
starting CPUs.

Signed-off-by: Akihiko Odaki <[e-mail]>
Reviewed-by: Peter Maydell <[e-mail]>
---
 contrib/elf2dmp/main.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

Patch

diff --git a/contrib/elf2dmp/main.c b/contrib/elf2dmp/main.c
index 9b278f392e39..89bf4e23566b 100644
--- a/contrib/elf2dmp/main.c
+++ b/contrib/elf2dmp/main.c
@@ -336,7 +336,12 @@  static int fill_header(WinDumpHeader64 *hdr, struct pa_space *ps,
     return 0;
 }
 
-static int fill_context(KDDEBUGGER_DATA64 *kdbg,
+/*
+ * fill_context() continues even if it fails to fill contexts of some CPUs.
+ * A dump may still contain valuable information even if it lacks contexts of
+ * some CPUs due to dump corruption or a failure before starting CPUs.
+ */
+static void fill_context(KDDEBUGGER_DATA64 *kdbg,
         struct va_space *vs, QEMU_Elf *qe)
 {
     int i;
@@ -350,7 +355,7 @@  static int fill_context(KDDEBUGGER_DATA64 *kdbg,
         if (va_space_rw(vs, kdbg->KiProcessorBlock + sizeof(Prcb) * i,
                     &Prcb, sizeof(Prcb), 0)) {
             eprintf("Failed to read CPU #%d PRCB location\n", i);
-            return 1;
+            continue;
         }
 
         if (!Prcb) {
@@ -361,7 +366,7 @@  static int fill_context(KDDEBUGGER_DATA64 *kdbg,
         if (va_space_rw(vs, Prcb + kdbg->OffsetPrcbContext,
                     &Context, sizeof(Context), 0)) {
             eprintf("Failed to read CPU #%d ContextFrame location\n", i);
-            return 1;
+            continue;
         }
 
         printf("Filling context for CPU #%d...\n", i);
@@ -369,11 +374,9 @@  static int fill_context(KDDEBUGGER_DATA64 *kdbg,
 
         if (va_space_rw(vs, Context, &ctx, sizeof(ctx), 1)) {
             eprintf("Failed to fill CPU #%d context\n", i);
-            return 1;
+            continue;
         }
     }
-
-    return 0;
 }
 
 static int pe_get_data_dir_entry(uint64_t base, void *start_addr, int idx,
@@ -619,9 +622,7 @@  int main(int argc, char *argv[])
         goto out_kdbg;
     }
 
-    if (fill_context(kdbg, &vs, &qemu_elf)) {
-        goto out_kdbg;
-    }
+    fill_context(kdbg, &vs, &qemu_elf);
 
     if (write_dump(&ps, &header, argv[2])) {
         eprintf("Failed to save dump\n");