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[PATCH] quick patch for PR31937
- From: "Patrick Olinet" <patrick dot olinet at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Wed, 16 May 2007 15:53:44 +0200
- Subject: [PATCH] quick patch for PR31937
Here is a quick patch related to PR31937. The bug prevents PowerPC
CPUs without FPU (such as PPC405EP) to use libffi, even if no
double/float are used. It crashes with an "illegal instruction"
message.
This bug also means that it crashes when you load & run java bytecode
from a native code binary compiled with gcj. I guess libffi is used in
this case to call java methods of the bytecode.
Notice that this quick patch will only allow you to use libffi (and
hence load & run java bytecode) without float/double numbers. But it
will not prevent a crash if floats or doubles are used. A deeper
modification, with probably calls to the soft float layer, would
probably be needed for this.
--- libffi/src/powerpc/ppc_closure.S.rev112340 2007-05-16
15:49:41.000000000 +0200
+++ libffi/src/powerpc/ppc_closure.S.fix 2007-05-16
15:49:35.000000000 +0200
@@ -29,14 +29,14 @@
stw %r10,44(%r1)
# next save fpr 1 to fpr 8 (aligned to 8)
- stfd %f1, 48(%r1)
- stfd %f2, 56(%r1)
- stfd %f3, 64(%r1)
- stfd %f4, 72(%r1)
- stfd %f5, 80(%r1)
- stfd %f6, 88(%r1)
- stfd %f7, 96(%r1)
- stfd %f8, 104(%r1)
+ # stfd %f1, 48(%r1)
+ # stfd %f2, 56(%r1)
+ # stfd %f3, 64(%r1)
+ # stfd %f4, 72(%r1)
+ # stfd %f5, 80(%r1)
+ # stfd %f6, 88(%r1)
+ # stfd %f7, 96(%r1)
+ # stfd %f8, 104(%r1)
# set up registers for the routine that actually does the work
# get the context pointer from the trampoline