ppc64: Rework inline syscall macros, fix clobbers & gcc3.3 from Franz Sirl

diff --git a/include/asm-ppc64/unistd.h b/include/asm-ppc64/unistd.h
index c019dbafe1e189d1f2461455b465fb9815351e25..102e846a80ab6dd54e4a763297177b912e6a6db7 100644 (file)
--- a/include/asm-ppc64/unistd.h
+++ b/include/asm-ppc64/unistd.h
@@ -267,6 +267,104 @@
 
 #ifndef __ASSEMBLY__
 
+/* On powerpc a system call basically clobbers the same registers like a
+ * function call, with the exception of LR (which is needed for the
+ * "sc; bnslr" sequence) and CR (where only CR0.SO is clobbered to signal
+ * an error return status).
+ */
+
+#define __syscall_nr(nr, type, name, args...)                          \
+       unsigned long __sc_ret, __sc_err;                               \
+       {                                                               \
+               register unsigned long __sc_0  __asm__ ("r0");          \
+               register unsigned long __sc_3  __asm__ ("r3");          \
+               register unsigned long __sc_4  __asm__ ("r4");          \
+               register unsigned long __sc_5  __asm__ ("r5");          \
+               register unsigned long __sc_6  __asm__ ("r6");          \
+               register unsigned long __sc_7  __asm__ ("r7");          \
+                                                                       \
+               __sc_loadargs_##nr(name, args);                         \
+               __asm__ __volatile__                                    \
+                       ("sc           \n\t"                            \
+                        "mfcr %0      "                                \
+                       : "=&r" (__sc_0),                               \
+                         "=&r" (__sc_3),  "=&r" (__sc_4),              \
+                         "=&r" (__sc_5),  "=&r" (__sc_6),              \
+                         "=&r" (__sc_7)                                \
+                       : __sc_asm_input_##nr                           \
+                       : "cr0", "ctr", "memory",                       \
+                         "r8", "r9", "r10","r11", "r12");              \
+               __sc_ret = __sc_3;                                      \
+               __sc_err = __sc_0;                                      \
+       }                                                               \
+       if (__sc_err & 0x10000000)                                      \
+       {                                                               \
+               errno = __sc_ret;                                       \
+               __sc_ret = -1;                                          \
+       }                                                               \
+       return (type) __sc_ret
+
+#define __sc_loadargs_0(name, dummy...)                                        \
+       __sc_0 = __NR_##name
+#define __sc_loadargs_1(name, arg1)                                    \
+       __sc_loadargs_0(name);                                          \
+       __sc_3 = (unsigned long) (arg1)
+#define __sc_loadargs_2(name, arg1, arg2)                              \
+       __sc_loadargs_1(name, arg1);                                    \
+       __sc_4 = (unsigned long) (arg2)
+#define __sc_loadargs_3(name, arg1, arg2, arg3)                                \
+       __sc_loadargs_2(name, arg1, arg2);                              \
+       __sc_5 = (unsigned long) (arg3)
+#define __sc_loadargs_4(name, arg1, arg2, arg3, arg4)                  \
+       __sc_loadargs_3(name, arg1, arg2, arg3);                        \
+       __sc_6 = (unsigned long) (arg4)
+#define __sc_loadargs_5(name, arg1, arg2, arg3, arg4, arg5)            \
+       __sc_loadargs_4(name, arg1, arg2, arg3, arg4);                  \
+       __sc_7 = (unsigned long) (arg5)
+
+#define __sc_asm_input_0 "0" (__sc_0)
+#define __sc_asm_input_1 __sc_asm_input_0, "1" (__sc_3)
+#define __sc_asm_input_2 __sc_asm_input_1, "2" (__sc_4)
+#define __sc_asm_input_3 __sc_asm_input_2, "3" (__sc_5)
+#define __sc_asm_input_4 __sc_asm_input_3, "4" (__sc_6)
+#define __sc_asm_input_5 __sc_asm_input_4, "5" (__sc_7)
+
+#define _syscall0(type,name)                                           \
+type name(void)                                                                \
+{                                                                      \
+       __syscall_nr(0, type, name);                                    \
+}
+
+#define _syscall1(type,name,type1,arg1)                                        \
+type name(type1 arg1)                                                  \
+{                                                                      \
+       __syscall_nr(1, type, name, arg1);                              \
+}
+
+#define _syscall2(type,name,type1,arg1,type2,arg2)                     \
+type name(type1 arg1, type2 arg2)                                      \
+{                                                                      \
+       __syscall_nr(2, type, name, arg1, arg2);                        \
+}
+
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)          \
+type name(type1 arg1, type2 arg2, type3 arg3)                          \
+{                                                                      \
+       __syscall_nr(3, type, name, arg1, arg2, arg3);                  \
+}
+
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
+type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)              \
+{                                                                      \
+       __syscall_nr(4, type, name, arg1, arg2, arg3, arg4);            \
+}
+
+#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
+type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)  \
+{                                                                      \
+       __syscall_nr(5, type, name, arg1, arg2, arg3, arg4, arg5);      \
+}
+
 #ifdef __KERNEL_SYSCALLS__
 
 /*