[POWERPC] 8xx: Move softemu8xx.c from arch/ppc

Previously, Soft_emulate_8xx was called with no implementation, resulting in
build failures whenever building 8xx without math emulation.  The
implementation is copied from arch/ppc to resolve this issue.

However, this sort of minimal emulation is not a very good idea other than
for compatibility with existing userspaces, as it's less efficient than
soft-float and can mislead users into believing they have soft-float.  Thus,
it is made a configurable option, off by default.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 5a49eabd492e..2f1857c9819f 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -906,7 +906,9 @@ void SoftwareEmulation(struct pt_regs *regs)
 {
         extern int do_mathemu(struct pt_regs *);
         extern int Soft_emulate_8xx(struct pt_regs *);
+#if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU)
         int errcode;
+#endif
 
         CHECK_FULL_REGS(regs);
 
@@ -936,7 +938,7 @@ void SoftwareEmulation(struct pt_regs *regs)
                 return;
         }
 
-#else
+#elif defined(CONFIG_8XX_MINIMAL_FPEMU)
         errcode = Soft_emulate_8xx(regs);
         switch (errcode) {
         case 0:
@@ -949,6 +951,8 @@ void SoftwareEmulation(struct pt_regs *regs)
                 _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
                 return;
         }
+#else
+        _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
 #endif
 }
 #endif /* CONFIG_8xx */