MIPS: The new ABI should be allowed to use r8 and r9 for syscalls.

linux_syscall_support.h

 /* Copyright (c) 2005-2011, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
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@@ skipping 2547 matching lines @@
                                "i"(__NR_clone), "i"(__NR_exit)
                              : "cc", "x8", "memory");
       }
       LSS_RETURN(int, __res);
     }
   #elif defined(__mips__)
     #undef LSS_REG
     #define LSS_REG(r,a) register unsigned long __r##r __asm__("$"#r) =       \
                                  (unsigned long)(a)
     #undef  LSS_BODY
+    #undef LSS_SYSCALL_CLOBBERS
+    #if _MIPS_SIM == _MIPS_SIM_ABI32
+    #define LSS_SYSCALL_CLOBBERS "$8", "$9", "$10", "$11", "$12",             \

[Mark Seaborn, 2014/07/22 18:19:37]

Shouldn't this also have $1 (aka $at), $3 (aka $v1), hi and lo?

AFAICT, these parts are the same for both old and new calling conventions.

[Lei Zhang, 2014/07/31 22:52:51]

Done.

+                                 "$13", "$14", "$15", "$24", "$25",           \
+                                 "memory"
+    #else
+    #define LSS_SYSCALL_CLOBBERS "$1", "3" "$10", "$11", "$12",               \

[Mark Seaborn, 2014/07/22 18:19:37]

Presumably should be:
  "$3",

i.e. missing comma and "$".

[Lei Zhang, 2014/07/31 22:52:51]

Done.

+                                 "$13", "$14", "$15", "$24", "$25",           \
+                                 "hi", "lo", "memory"
+    #endif
     #define LSS_BODY(type,name,r7,...)                                        \
           register unsigned long __v0 __asm__("$2") = __NR_##name;            \
           __asm__ __volatile__ ("syscall\n"                                   \
                                 : "+r"(__v0), r7 (__r7)                       \
                                 : "0"(__v0), ##__VA_ARGS__                    \
-                                : "$8", "$9", "$10", "$11", "$12",            \
-                                  "$13", "$14", "$15", "$24", "$25",          \
-                                  "memory");                                  \
+                                : LSS_SYSCALL_CLOBBERS);                      \
           LSS_RETURN(type, __v0, __r7)
     #undef _syscall0
     #define _syscall0(type, name)                                             \
       type LSS_NAME(name)(void) {                                             \
         register unsigned long __r7 __asm__("$7");                            \
         LSS_BODY(type, name, "=r");                                           \
       }
     #undef _syscall1
     #define _syscall1(type, name, type1, arg1)                                \
       type LSS_NAME(name)(type1 arg1) {                                       \
@@ skipping 1425 matching lines @@
 # pragma pop_macro("fstat64")
 # pragma pop_macro("lstat64")
 #endif
 
 #if defined(__cplusplus) && !defined(SYS_CPLUSPLUS)
 }
 #endif
 
 #endif
 #endif