From 60bf84cf4ce277e1212929f35674796888a681ce Mon Sep 17 00:00:00 2001
From: Stefan Weil <weil@mail.berlios.de>
Date: Fri, 9 Apr 2010 17:28:40 +0200
Subject: tcp/mips: Change TCG_AREG0 (fp -> s0)

Register fp (frame pointer) is a bad choice for compilations
without optimisation, because the compiler makes heavy use
of this register (so the resulting code crashes).

Register s0 had been used for TCG_AREG1 in earlier releases,
but was no longer used and is now free for TCG_AREG0.

The resulting code works for compilations without
optimisation (tested with qemu mips in qemu mips
on x86 host).

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/mips/tcg-target.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'tcg/mips/tcg-target.c')

diff --git a/tcg/mips/tcg-target.c b/tcg/mips/tcg-target.c
index f4fb615bf0..f38eb2888d 100644
--- a/tcg/mips/tcg-target.c
+++ b/tcg/mips/tcg-target.c
@@ -1450,7 +1450,9 @@ static const TCGTargetOpDef mips_op_defs[] = {
 };
 
 static int tcg_target_callee_save_regs[] = {
+#if 0 /* used for the global env (TCG_AREG0), so no need to save */
     TCG_REG_S0,
+#endif
     TCG_REG_S1,
     TCG_REG_S2,
     TCG_REG_S3,
@@ -1459,8 +1461,7 @@ static int tcg_target_callee_save_regs[] = {
     TCG_REG_S6,
     TCG_REG_S7,
     TCG_REG_GP,
-    /* TCG_REG_FP, */ /* currently used for the global env, so np
-                         need to save */
+    TCG_REG_FP,
     TCG_REG_RA,       /* should be last for ABI compliance */
 };
 
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