coredump:support coredump aligned access registers

Signed-off-by: anjiahao <anjiahao@xiaomi.com>

binfmt/libelf/libelf_coredump.c

@@ -423,9 +423,34 @@ static void elf_emit_memory(FAR struct elf_dumpinfo_s *cinfo, int memsegs)
 
   for (i = 0; i < memsegs; i++)
     {
-      elf_emit(cinfo, (FAR void *)cinfo->regions[i].start,
+      if (cinfo->regions[i].flags & PF_REGISTER)
-               cinfo->regions[i].end -
+        {
-               cinfo->regions[i].start);
+          FAR uintptr_t *start = (FAR uintptr_t *)cinfo->regions[i].start;
+          FAR uintptr_t *end = (FAR uintptr_t *)cinfo->regions[i].end;
+          uintptr_t buf[64];
+          size_t offset = 0;
+
+          while (start < end)
+            {
+              buf[offset++] = *start++;
+
+              if (offset % (sizeof(buf) / sizeof(uintptr_t)) == 0)
+                {
+                  elf_emit(cinfo, buf, sizeof(buf));
+                  offset = 0;
+                }
+            }
+
+          if (offset != 0)
+            {
+              elf_emit(cinfo, buf, offset * sizeof(uintptr_t));
+            }
+        }
+      else
+        {
+          elf_emit(cinfo, (FAR void *)cinfo->regions[i].start,
+                   cinfo->regions[i].end - cinfo->regions[i].start);
+        }
 
       /* Align to page */
 

include/elf.h

@@ -233,6 +233,12 @@
 #define PF_X               1          /* Execute */
 #define PF_W               2          /* Write */
 #define PF_R               4          /* Read */
+#define PF_MASKOS          0x0ff00000 /* All bits included in the PF_MASKOS
+                                       * mask are reserved for operating system-specific
+                                       * semantics.
+                                       */
+#define PF_REGISTER        0x00100000 /* Register, need pointer aligned access */
+
 #define PF_MASKPROC        0xf0000000 /* Unspecified */
 
 /* Figure 5-10: Dynamic Array Tags, d_tag */