[POWERPC] Fix 64 bits vDSO DWARF info for CR register

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The current DWARF info for CR are incorrect, causing the gcc unwinder to
go to lunch if we take a segfault in the vdso.  This fixes it.

Problem identified by Andrew Haley, and fix provided by Jakub Jelinek
(thanks !).

Unfortunately, a bug in gcc cause it to not quite work either, but that
is being fixed separately with something around the lines of:

linux-unwind.h:

     fs->regs.reg[R_CR2].loc.offset = (long) &regs->ccr - new_cfa;
+    /* CR? regs are just 32-bit and PPC is big-endian.  */
+    fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4;

(According to Jakub)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

...

This commit is contained in:

Benjamin Herrenschmidt 2007-10-17 14:26:50 +10:00 • committed by Paul Mackerras

parent f66bce5e6a

commit 081c11a5d0

1 changed files with 7 additions and 4 deletions

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arch/powerpc/kernel/vdso64/sigtramp.S

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