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sh: unwinder: Fix up invalid PC refetch in dwarf unwinder.

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The dwarf unwinder presently attempts to provide a sane PC value if none
is provided, however the logic is broken and cases where a previous valid
dwarf frame exists along with a bogus PC value can still proceed. This
fixes up the test and prevents the unwinder from blowing up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-11-06 17:23:33 +09:00
parent 345e5a7672
commit 421b541110
1 changed files with 1 additions and 1 deletions
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arch/sh/kernel/dwarf.c
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@ -555,7 +555,7 @@ struct dwarf_frame * dwarf_unwind_stack(unsigned long pc,
* NOTE: the return address is guaranteed to be setup by the
* time this function makes its first function call.
*/
if (!pc && !prev)
if (!pc || !prev)
pc = (unsigned long)current_text_addr();
#ifdef CONFIG_FUNCTION_GRAPH_TRACER