[Qemu-devel] [PATCH 1/2] target-ppc: Change default cpu for ppc64le-linux-user

[Richard Henderson <rth@twiddle.net>]

The default, 970fx, doesn't support MSR_LE.  So even though we set LE in
ppc_cpu_reset, it gets cleared again in hreg_store_msr.  Error out if a
user-selected cpu model doesn't support LE.

Cc: Aldy Hernandez <aldyh@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
The warning one gets from the unimplemented insns from tcg
is perhaps unfortunate, but it's better than silently dropping
the MSR_LE bit and interpreting the first few insns with the
wrong endianness and generating SIGILL.

One could, perhaps, simply return false from need_byteswap.
But then the value of MSR would still be wrong, and I can imagine
that would affect gdb's interpretation of the current mode.


r~
---
 linux-user/main.c           | 10 +++++++---
 target-ppc/translate_init.c |  4 ++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/linux-user/main.c b/linux-user/main.c
index 900a17f..058b08c 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3901,11 +3901,15 @@ int main(int argc, char **argv, char **envp)
 #elif defined TARGET_OPENRISC
         cpu_model = "or1200";
 #elif defined(TARGET_PPC)
-#ifdef TARGET_PPC64
+# ifdef TARGET_PPC64
+#  ifdef TARGET_WORDS_BIGENDIAN
         cpu_model = "970fx";
-#else
+#  else
+        cpu_model = "POWER7";
+#  endif
+# else
         cpu_model = "750";
-#endif
+# endif
 #else
         cpu_model = "any";
 #endif
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 85581c9..72128d8 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -9538,6 +9538,10 @@ static void ppc_cpu_reset(CPUState *s)
 #endif
 #if !defined(TARGET_WORDS_BIGENDIAN)
     msr |= (target_ulong)1 << MSR_LE; /* Little-endian user mode */
+    if (!((env->msr_mask >> MSR_LE) & 1)) {
+        fprintf(stderr, "Selected CPU does not support little-endian.\n");
+        exit(1);
+    }
 #endif
 #endif
 
-- 
1.9.3