[Qemu-devel] [PATCH] linux-user: Use the 5KEf processor for 64-bit emulation

[Maciej W. Rozycki]

Replace the 20Kc original MIPS64 ISA processor used for 64-bit user
emulation with the 5KEf processor that implements the MIPS64r2 ISA,
complementing the choice of the 24Kf processor for 32-bit emulation.

Signed-off-by: Maciej W. Rozycki <address@hidden>
---
Hi,

 For user emulation mode I think we want to default to the highest ISA 
level supported, for maximum user flexibility.  Currently the MIPS64r2 
ISA is the highest 64-bit ISA we have a real processor support for so 
use it and the 5KEf which is the processor we have that implements it.  
Later, as newer processors are added, we can bump it further up.

 I think we should consider picking something for microMIPS support too 
sometime, perhaps based on ELF file flags, however the thing is with 
that we have no FPU processor to choose.  So let's skip it for now.

 I have tested it lightly by running the GCC test suite for the 
mips-linux-gnu target and the n64 ABI (`-EB -mabi=64' multilib), using 
MIPS64r2 code.

 Please apply.

  Maciej

qemu-mips-user-5kef.diff
Index: qemu-git-trunk/linux-user/main.c
===================================================================
--- qemu-git-trunk.orig/linux-user/main.c       2014-11-20 10:47:31.000000000 
+0000
+++ qemu-git-trunk/linux-user/main.c    2014-11-20 10:50:57.098940605 +0000
@@ -3929,7 +3929,7 @@ int main(int argc, char **argv, char **e
 #endif
 #elif defined(TARGET_MIPS)
 #if defined(TARGET_ABI_MIPSN32) || defined(TARGET_ABI_MIPSN64)
-        cpu_model = "20Kc";
+        cpu_model = "5KEf";
 #else
         cpu_model = "24Kf";
 #endif