grab syscall macros from the kernel

libc/sysdeps/linux/alpha/bits/syscalls.h

@@ -4,16 +4,194 @@
 # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
 #endif
 
-#include <features.h>
-
-/* Do something very evil for now.  Until we create our own syscall
- * macros, short circuit bits/sysnum.h  and use asm/unistd.h instead */
-#include <asm/unistd.h>
-
 /* This includes the `__NR_<name>' syscall numbers taken from the Linux kernel
  * header files.  It also defines the traditional `SYS_<name>' macros for older
  * programs.  */
 #include <bits/sysnum.h>
 
-#endif /* _BITS_SYSCALLS_H */
+#ifndef __set_errno
+# define __set_errno(val) (*__errno_location ()) = (val)
+#endif
+
+#ifndef __ASSEMBLER__
+
+#define _syscall_return(type)						\
+	return (_sc_err ? __set_errno(_sc_ret), _sc_ret = -1L : 0), (type) _sc_ret
+
+#define _syscall_clobbers						\
+	"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",			\
+	"$22", "$23", "$24", "$25", "$27", "$28" 			\
+
+#define _syscall0(type, name)						\
+type name(void)								\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_19 __asm__("$19");			\
+									\
+		_sc_0 = __NR_##name;					\
+		__asm__("callsys # %0 %1 %2"				\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0)					\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
 
+#define _syscall1(type,name,type1,arg1)					\
+type name(type1 arg1)							\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_19 __asm__("$19");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		__asm__("callsys # %0 %1 %2 %3"				\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16)			\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
+
+#define _syscall2(type,name,type1,arg1,type2,arg2)			\
+type name(type1 arg1,type2 arg2)					\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_17 __asm__("$17");			\
+		register long _sc_19 __asm__("$19");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		_sc_17 = (long) (arg2);					\
+		__asm__("callsys # %0 %1 %2 %3 %4"			\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17)		\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
+
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)		\
+type name(type1 arg1,type2 arg2,type3 arg3)				\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_17 __asm__("$17");			\
+		register long _sc_18 __asm__("$18");			\
+		register long _sc_19 __asm__("$19");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		_sc_17 = (long) (arg2);					\
+		_sc_18 = (long) (arg3);					\
+		__asm__("callsys # %0 %1 %2 %3 %4 %5"			\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
+			  "r"(_sc_18)					\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
+
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
+type name (type1 arg1, type2 arg2, type3 arg3, type4 arg4)		 \
+{									 \
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_17 __asm__("$17");			\
+		register long _sc_18 __asm__("$18");			\
+		register long _sc_19 __asm__("$19");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		_sc_17 = (long) (arg2);					\
+		_sc_18 = (long) (arg3);					\
+		_sc_19 = (long) (arg4);					\
+		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6"		\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
+			  "r"(_sc_18), "1"(_sc_19)			\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+} 
+
+#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)	\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_17 __asm__("$17");			\
+		register long _sc_18 __asm__("$18");			\
+		register long _sc_19 __asm__("$19");			\
+		register long _sc_20 __asm__("$20");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		_sc_17 = (long) (arg2);					\
+		_sc_18 = (long) (arg3);					\
+		_sc_19 = (long) (arg4);					\
+		_sc_20 = (long) (arg5);					\
+		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6 %7"		\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
+			  "r"(_sc_18), "1"(_sc_19), "r"(_sc_20)		\
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
+
+#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
+	  type5,arg5,type6,arg6)					 \
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6)\
+{									\
+	long _sc_ret, _sc_err;						\
+	{								\
+		register long _sc_0 __asm__("$0");			\
+		register long _sc_16 __asm__("$16");			\
+		register long _sc_17 __asm__("$17");			\
+		register long _sc_18 __asm__("$18");			\
+		register long _sc_19 __asm__("$19");			\
+		register long _sc_20 __asm__("$20");			\
+		register long _sc_21 __asm__("$21");			\
+									\
+		_sc_0 = __NR_##name;					\
+		_sc_16 = (long) (arg1);					\
+		_sc_17 = (long) (arg2);					\
+		_sc_18 = (long) (arg3);					\
+		_sc_19 = (long) (arg4);					\
+		_sc_20 = (long) (arg5);					\
+		_sc_21 = (long) (arg6);					\
+		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6 %7 %8"		\
+			: "=r"(_sc_0), "=r"(_sc_19)			\
+			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
+			  "r"(_sc_18), "1"(_sc_19), "r"(_sc_20), "r"(_sc_21) \
+			: _syscall_clobbers);				\
+		_sc_ret = _sc_0, _sc_err = _sc_19;			\
+	}								\
+	_syscall_return(type);						\
+}
+
+#endif /* __ASSEMBLER__ */
+#endif /* _BITS_SYSCALLS_H */