get rid of linux-headers hack ... rip code from glibc

1 files changed, 169 insertions, 7 deletions

diff --git a/libc/sysdeps/linux/m68k/bits/syscalls.h b/libc/sysdeps/linux/m68k/bits/syscalls.h
index 62541b873..c833cf777 100644
--- a/libc/sysdeps/linux/m68k/bits/syscalls.h
+++ b/libc/sysdeps/linux/m68k/bits/syscalls.h
@@ -4,16 +4,178 @@
 # 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
+
+/*
+   Some of the sneaky macros in the code were taken from 
+   glibc-2.2.5/sysdeps/unix/sysv/linux/m68k/sysdep.h
+*/
+
+#ifndef __ASSEMBLER__
+
+#undef _syscall0
+#define _syscall0(type,name) \
+type name(void) \
+{ \
+return (type) (INLINE_SYSCALL(name, 0)); \
+}
+
+#undef _syscall1
+#define _syscall1(type,name,type1,arg1) \
+type name(type1 arg1) \
+{ \
+return (type) (INLINE_SYSCALL(name, 1, arg1)); \
+}
+
+#undef _syscall2
+#define _syscall2(type,name,type1,arg1,type2,arg2) \
+type name(type1 arg1,type2 arg2) \
+{ \
+return (type) (INLINE_SYSCALL(name, 2, arg1, arg2)); \
+}
+
+#undef _syscall3
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
+type name(type1 arg1,type2 arg2,type3 arg3) \
+{ \
+return (type) (INLINE_SYSCALL(name, 3, arg1, arg2, arg3)); \
+}
+
+#undef _syscall4
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
+type name (type1 arg1, type2 arg2, type3 arg3, type4 arg4) \
+{ \
+return (type) (INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4)); \
+} 
+
+#undef _syscall5
+#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) \
+{ \
+return (type) (INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5)); \
+}
+
+#undef _syscall6
+#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) \
+{ \
+return (type) (INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6)); \
+}
 
+/* Linux takes system call arguments in registers:
+
+	syscall number	%d0	     call-clobbered
+	arg 1		%d1	     call-clobbered
+	arg 2		%d2	     call-saved
+	arg 3		%d3	     call-saved
+	arg 4		%d4	     call-saved
+	arg 5		%d5	     call-saved
+
+   The stack layout upon entering the function is:
+
+	20(%sp)		Arg# 5
+	16(%sp)		Arg# 4
+	12(%sp)		Arg# 3
+	 8(%sp)		Arg# 2
+	 4(%sp)		Arg# 1
+	  (%sp)		Return address
+
+   (Of course a function with say 3 arguments does not have entries for
+   arguments 4 and 5.)
+
+   Separate move's are faster than movem, but need more space.  Since
+   speed is more important, we don't use movem.  Since %a0 and %a1 are
+   scratch registers, we can use them for saving as well.  */
+
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...)				\
+  ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args);	\
+     if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0))\
+       {								\
+	 __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, ));		\
+	 _sys_result = (unsigned int) -1;				\
+       }								\
+     (int) _sys_result; })
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err, nr, args...)	\
+  ({ unsigned int _sys_result;				\
+     {							\
+       /* Load argument values in temporary variables
+	  to perform side effects like function calls
+	  before the call used registers are set.  */	\
+       LOAD_ARGS_##nr (args)				\
+       LOAD_REGS_##nr					\
+       register int _d0 asm ("%d0") = __NR_##name;	\
+       asm volatile ("trap #0"				\
+		     : "=d" (_d0)			\
+		     : "0" (_d0) ASM_ARGS_##nr		\
+		     : "memory");			\
+       _sys_result = _d0;				\
+     }							\
+     (int) _sys_result; })
+
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err)		\
+  ((unsigned int) (val) >= -4095U)
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))
+
+#define LOAD_ARGS_0()
+#define LOAD_REGS_0
+#define ASM_ARGS_0
+#define LOAD_ARGS_1(a1)				\
+  LOAD_ARGS_0 ()				\
+  int __arg1 = (int) (a1);
+#define LOAD_REGS_1				\
+  register int _d1 asm ("d1") = __arg1;		\
+  LOAD_REGS_0
+#define ASM_ARGS_1	ASM_ARGS_0, "d" (_d1)
+#define LOAD_ARGS_2(a1, a2)			\
+  LOAD_ARGS_1 (a1)				\
+  int __arg2 = (int) (a2);
+#define LOAD_REGS_2				\
+  register int _d2 asm ("d2") = __arg2;		\
+  LOAD_REGS_1
+#define ASM_ARGS_2	ASM_ARGS_1, "d" (_d2)
+#define LOAD_ARGS_3(a1, a2, a3)			\
+  LOAD_ARGS_2 (a1, a2)				\
+  int __arg3 = (int) (a3);
+#define LOAD_REGS_3				\
+  register int _d3 asm ("d3") = __arg3;		\
+  LOAD_REGS_2
+#define ASM_ARGS_3	ASM_ARGS_2, "d" (_d3)
+#define LOAD_ARGS_4(a1, a2, a3, a4)		\
+  LOAD_ARGS_3 (a1, a2, a3)			\
+  int __arg4 = (int) (a4);
+#define LOAD_REGS_4				\
+  register int _d4 asm ("d4") = __arg4;		\
+  LOAD_REGS_3
+#define ASM_ARGS_4	ASM_ARGS_3, "d" (_d4)
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5)		\
+  LOAD_ARGS_4 (a1, a2, a3, a4)			\
+  int __arg5 = (int) (a5);
+#define LOAD_REGS_5				\
+  register int _d5 asm ("d5") = __arg5;		\
+  LOAD_REGS_4
+#define ASM_ARGS_5	ASM_ARGS_4, "d" (_d5)
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6)	\
+  LOAD_ARGS_5 (a1, a2, a3, a4, a5)		\
+  int __arg6 = (int) (a6);
+#define LOAD_REGS_6				\
+  register int _a0 asm ("a0") = __arg6;		\
+  LOAD_REGS_5
+#define ASM_ARGS_6	ASM_ARGS_5, "a" (_a0)
+
+#endif /* __ASSEMBLER__ */
+#endif /* _BITS_SYSCALLS_H */