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

linux_syscall_support.h

Index: linux_syscall_support.h
===================================================================
--- linux_syscall_support.h	(revision 26)
+++ linux_syscall_support.h	(working copy)
@@ -2565,14 +2565,22 @@
     #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)                                             \