From d9d7210c7dc2975f27e8d97e10f2ab3ff648d373 Mon Sep 17 00:00:00 2001
From: j_mayer <j_mayer@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Tue, 18 Sep 2007 11:17:30 +0000
Subject: [PATCH] Fix PowerPC 32 emulation on 64 bits hosts: we can use 64 bits
 registers but not pretend page is 1kB long As it seems most Linux programs
 assume page-size is 4kB, never allow 1kB pages for user-mode only emulation.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3182 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-ppc/cpu.h | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 1ff32fd432..75aefb051b 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -23,19 +23,10 @@
 #include "config.h"
 #include <inttypes.h>
 
-#if !defined(TARGET_PPCEMB)
-#if defined(TARGET_PPC64) || (HOST_LONG_BITS >= 64)
-/* When using 64 bits temporary registers,
- * we can use 64 bits GPR with no extra cost
- */
-#define TARGET_PPCEMB
-#endif
-#endif
-
 #if defined (TARGET_PPC64)
 typedef uint64_t ppc_gpr_t;
-#define TARGET_LONG_BITS 64
 #define TARGET_GPR_BITS  64
+#define TARGET_LONG_BITS 64
 #define REGX "%016" PRIx64
 #define TARGET_PAGE_BITS 12
 #elif defined(TARGET_PPCEMB)
@@ -43,15 +34,32 @@ typedef uint64_t ppc_gpr_t;
 #define TARGET_PHYS_ADDR_BITS 64
 /* GPR are 64 bits: used by vector extension */
 typedef uint64_t ppc_gpr_t;
-#define TARGET_LONG_BITS 32
 #define TARGET_GPR_BITS  64
+#define TARGET_LONG_BITS 32
 #define REGX "%016" PRIx64
+#if defined(CONFIG_USER_ONLY)
+/* It looks like a lot of Linux programs assume page size
+ * is 4kB long. This is evil, but we have to deal with it...
+ */
+#define TARGET_PAGE_BITS 12
+#else
 /* Pages can be 1 kB small */
 #define TARGET_PAGE_BITS 10
+#endif
+#else
+#if (HOST_LONG_BITS >= 64)
+/* When using 64 bits temporary registers,
+ * we can use 64 bits GPR with no extra cost
+ * It's even an optimization as it will prevent
+ * the compiler to do unuseful masking in the micro-ops.
+ */
+typedef uint64_t ppc_gpr_t;
+#define TARGET_GPR_BITS  64
 #else
 typedef uint32_t ppc_gpr_t;
-#define TARGET_LONG_BITS 32
 #define TARGET_GPR_BITS  32
+#endif
+#define TARGET_LONG_BITS 32
 #define REGX "%08" PRIx32
 #define TARGET_PAGE_BITS 12
 #endif