Hi Dave
Recently there were changes made to kexec tools to support 64K page size.
With those changes vmcore file obtained from a kernel which supports 64K
page size cannot be analyzed using crash on a machine running with kernel
supporting 4K page size.
The following changes in crash tool resolves the problem.
Look if the symbol __hash_page_64k exists. This symbol is defined only
for kernels with 64K PAGE SIZE support. If yes then the dump was taken
with a kernel supporting 64k page size. So use the vmcore page size[64K]
instead of getpagesize().
Thanks
-Sachin
* Recently there were changes made to kexec tools to support 64K page size.
With those changes vmcore file obtained from a kernel which supports 64K
page size cannot be analyzed using crash on a machine running with kernel
supporting 4K page size.
The following change were made in crash tool to solve the problem.
Look if the symbol __hash_page_64k exists. If yes then the dump was taken
with a kernel supporting 64k page size. So change the page size accordingly.
Signed-Off-By: Sachin Sant <sachinp@xxxxxxxxxx>
--
diff -Naurp crash-4.0/defs.h crash-4.0-new/defs.h
--- crash-4.0/defs.h 2006-09-14 21:41:50.000000000 -0400
+++ crash-4.0-new/defs.h 2006-09-14 21:48:37.000000000 -0400
@@ -2297,6 +2297,7 @@ struct efi_memory_desc_t {
#define _64BIT_
#define MACHINE_TYPE "PPC64"
+#define PPC64_64K_PAGE_SIZE 65536
#define PAGEBASE(X) (((ulong)(X)) & (ulong)machdep->pagemask)
#define PTOV(X) ((unsigned long)(X)+(machdep->kvbase))
diff -Naurp crash-4.0/ppc64.c crash-4.0-new/ppc64.c
--- crash-4.0/ppc64.c 2006-09-14 21:41:50.000000000 -0400
+++ crash-4.0-new/ppc64.c 2006-09-14 21:50:26.000000000 -0400
@@ -67,19 +67,6 @@ ppc64_init(int when)
machdep->verify_symbol = ppc64_verify_symbol;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
- machdep->pagesize = memory_page_size();
- machdep->pageshift = ffs(machdep->pagesize) - 1;
- machdep->pageoffset = machdep->pagesize - 1;
- machdep->pagemask = ~((ulonglong)machdep->pageoffset);
- machdep->stacksize = 4 * machdep->pagesize;
- if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
- error(FATAL, "cannot malloc pgd space.");
- if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
- error(FATAL, "cannot malloc pmd space.");
- if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
- error(FATAL, "cannot malloc ptbl space.");
- if ((machdep->machspec->level4 = (char *)malloc(PAGESIZE())) == NULL)
- error(FATAL, "cannot malloc level4 space.");
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
@@ -93,6 +80,40 @@ ppc64_init(int when)
break;
case PRE_GDB:
+ /*
+ * Recently there were changes made to kexec tools
+ * to support 64K page size. With those changes
+ * vmcore file obtained from a kernel which supports
+ * 64K page size cannot be analyzed using crash on a
+ * machine running with kernel supporting 4K page size
+ *
+ * The following modifications are required in crash
+ * tool to be in sync with kexec tools.
+ *
+ * Look if the following symbol exists. If yes then
+ * the dump was taken with a kernel supporting 64k
+ * page size. So change the page size accordingly.
+ *
+ * Also moved the following code block from
+ * PRE_SYMTAB case here.
+ */
+ if (symbol_exists("__hash_page_64K"))
+ machdep->pagesize = PPC64_64K_PAGE_SIZE;
+ else
+ machdep->pagesize = memory_page_size();
+ machdep->pageshift = ffs(machdep->pagesize) - 1;
+ machdep->pageoffset = machdep->pagesize - 1;
+ machdep->pagemask = ~((ulonglong)machdep->pageoffset);
+ machdep->stacksize = 4 * machdep->pagesize;
+ if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
+ error(FATAL, "cannot malloc pgd space.");
+ if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
+ error(FATAL, "cannot malloc pmd space.");
+ if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
+ error(FATAL, "cannot malloc ptbl space.");
+ if ((machdep->machspec->level4 = (char *)malloc(PAGESIZE())) == NULL)
+ error(FATAL, "cannot malloc level4 space.");
+
machdep->kvbase = symbol_value("_stext");
machdep->identity_map_base = machdep->kvbase;
machdep->is_kvaddr = generic_is_kvaddr;
--
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