powerpc: ELF2 binaries signal handling
For the ELFv2 ABI, the hander is the entry point, not a function descriptor. We also need to set up r12, and fortunately the fast_exception_return exit path restores r12 for us so nothing else is required. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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