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Re: [rfa:NetBSD/ppc] Implement signal trampoline unwinder


On Sun, Feb 29, 2004 at 08:05:28PM -0500, Andrew Cagney wrote:

It appears to work (but doesn't have much effect without an rs6000 unwinder).

One question (and to follow up my earlier post) is there a better way of doing this:

+  if (frame_pc_unwind (next_frame) > 0x7f000000)
+    /* Assume anything that is vaguely on the stack is a signal
+       trampoline.  */
+    return &ppcnbsd_sigtramp_unwind;

ok?, eventually for 6.1?


For other targets, we grub in the code for the sigtramp instruction
sequence.  I'm betting it's fixed for NetBSD too?  ppc_linux_in_sigtramp
does this.

That's potentially expensive - there should also be a predicate like the above before the stack is read checked.


Andrew



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