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sh: dwarf unwinder depends on SHcompact. 

Presently there's no SHmedia support plugged in for the dwarf unwinder.
While it's trivial to provide an SHmedia version of dwarf_read_arch_reg(),
the general sh64 case is more complicated in that the TLB miss handler
uses a locked down set of registers for optimization (including the frame
pointer) which we need for the unwind table generation.

While freeing up the frame pointer for use in the TLB miss handler is
reasonably straightforward, it's still more trouble than it's worth, so
we simply restrict the unwinder to 32-bit for now.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2012-03-30 19:31:22 +09:00
parent f03c4866d3
commit da47f4a318
1 changed files with 1 additions and 0 deletions
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arch/sh/Kconfig.debug
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@ -61,6 +61,7 @@ config DUMP_CODE
config DWARF_UNWINDER
bool "Enable the DWARF unwinder for stacktraces"
select FRAME_POINTER
depends on SUPERH32
default n
help
Enabling this option will make stacktraces more accurate, at