I noticed that Ski was unable to do a stacktrace on the kernel. Turns out that's because the PT_IA_64_UNWIND program-header is missing. Perhaps this is due to a change in binutils, but in any case, it seems like we should be explicit about the unwind header, so this patch is probably a good idea no matter what. Note that the patch assumes that the earlier patch to add a PT_NOTE header has been applied already. Regards, --david -- Mosberger Consulting LLC, http://www.mosberger-consulting.com/
[IA64] Explicitly put the unwind section into its own program-header. This
used to be unnecessary (probably because binutils did it for us), but
with current binutils (e.g., v2.17.50.20070804) we won't get
the PT_IA_64_UNWIND header without this patch which will break
unwinding in a debugger and simulators such as Ski.
Signed-off-by: David Mosberger-Tang <dmosberger@xxxxxxxxx>
--- arch/ia64/kernel/vmlinux.lds.S~ 2007-08-09 11:38:28.000000000 -0600
+++ arch/ia64/kernel/vmlinux.lds.S 2007-08-09 19:40:08.000000000 -0600
@@ -21,6 +21,7 @@
percpu PT_LOAD;
data PT_LOAD;
note PT_NOTE;
+ unwind 0x70000001; /* PT_IA_64_UNWIND, but ld doesn't match the name */
}
SECTIONS
{
@@ -103,7 +104,8 @@
__start_unwind = .;
*(.IA_64.unwind*)
__end_unwind = .;
- }
+ } :code :unwind
+ code_continues2 : {} : code
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