[Crash-utility] [PATCH] crash: unwind with LKCD_KERNTYPES
This patch enables stack unwind (on ia64) when using a kerntypes
file for a namelist.
When using a kerntypes file, we have just the address of variable unw
and the definition of an unw structure.
As you can see, I didn't change the indentation of the normal code.
Simple to do, but I didn't want to clutter this patch for a first pass.
I tested this against a live 2.6.16 (sles) kernel.
Diffed against crash-4.0-7.6
Signed-off-by: Cliff Wickman <cpw(a)sgi.com>
---
unwind.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
Index: crash-4.0-7.6.ia64/unwind.c
===================================================================
--- crash-4.0-7.6.ia64.orig/unwind.c
+++ crash-4.0-7.6.ia64/unwind.c
@@ -1395,10 +1395,43 @@ unwind_init_v2(void)
unwind_init_v3(void)
#endif
{
+ int len;
struct gnu_request request, *req;
req = &request;
+ if (LKCD_KERNTYPES()) {
+ if ((len = STRUCT_SIZE("unw")) == 0) {
+ error(WARNING,
+ "cannot determine unw.tables offset; no struct unw\n");
+ machdep->flags |= UNW_OUT_OF_SYNC;
+ return;
+ }
+ machdep->machspec->unw_tables_offset =
+ MEMBER_OFFSET("unw", "tables");
+ if (MEMBER_EXISTS("unw", "r0"))
+ machdep->flags |= UNW_R0;
+ /*
+ * no verification of save_order, sw_off, preg_index as
+ * we're purely depending on the structure definition.
+ */
+ if (MEMBER_EXISTS("unw", "pt_regs_offsets")) {
+ machdep->machspec->unw_pt_regs_offsets =
+ MEMBER_OFFSET("unw", "pt_regs_offsets") -
+ machdep->machspec->unw_tables_offset;
+ machdep->machspec->unw_kernel_table_offset =
+ MEMBER_OFFSET("unw", "kernel_table") -
+ machdep->machspec->unw_tables_offset;
+ machdep->flags |= UNW_PTREGS;
+ }
+ if (!load_unw_table(CLEAR_SCRIPT_CACHE)) {
+ error(WARNING,
+ "unwind_init: cannot read kernel unw table\n");
+ machdep->flags |= UNW_OUT_OF_SYNC;
+ }
+ machdep->machspec->unw = (void *)&unw;
+ /* fall to common structure size verifications */
+ } else {
if (get_symbol_type("unw", "tables", req) == TYPE_CODE_UNDEF)
{
/*
* KLUDGE ALERT:
@@ -1449,6 +1482,7 @@ unwind_init_v3(void)
machdep->machspec->unw = (void *)&unw;
}
+ }
verify_common_struct("unw_frame_info", sizeof(struct unw_frame_info));
verify_common_struct("unw_table", sizeof(struct unw_table));