Sat Feb 10 13:09:03 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/m68k/brk.c,
	sysdeps/unix/sysv/linux/m68k/mmap.S,
	sysdeps/unix/sysv/linux/m68k/select.S,
	sysdeps/unix/sysv/linux/m68k/sigcontext.h,
	sysdeps/unix/sysv/linux/m68k/sigreturn.S,
	sysdeps/unix/sysv/linux/m68k/socket.S,
	sysdeps/unix/sysv/linux/m68k/syscall.S,
	sysdeps/unix/sysv/linux/m68k/sysdep.S,
	sysdeps/unix/sysv/linux/m68k/sysdep.h: New files.
	* sysdeps/unix/sysv/linux/m68k/brk.c,
	sysdeps/unix/sysv/linux/m68k/mmap.S,
	sysdeps/unix/sysv/linux/m68k/select.S,
	sysdeps/unix/sysv/linux/m68k/sigcontext.h,
	sysdeps/unix/sysv/linux/m68k/sigreturn.S,
	sysdeps/unix/sysv/linux/m68k/socket.S,
	sysdeps/unix/sysv/linux/m68k/syscall.S,
	sysdeps/unix/sysv/linux/m68k/sysdep.S,
	sysdeps/unix/sysv/linux/m68k/sysdep.h: New files.

1 files changed, 131 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/m68k/sysdep.h b/sysdeps/unix/sysv/linux/m68k/sysdep.h
new file mode 100644
index 0000000000..9b6c8e1975
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/sysdep.h
@@ -0,0 +1,131 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Written by Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>,
+December 1995.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* In the Linux/ELF world, C symbols are asm symbols.  */
+#define NO_UNDERSCORES
+
+#include <sysdeps/unix/sysdep.h>
+
+#ifdef ASSEMBLER
+
+#define POUND #
+
+/* Define an entry point visible from C.  */
+#define	ENTRY(name)							      \
+  .globl name;								      \
+  .type name, @function;						      \
+  .align 4;								      \
+  name##:
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define	syscall_error	__syscall_error
+
+/* Linux uses a negative return value to indicate syscall errors, unlike
+   most Unices, which use the condition codes' carry flag.  */
+#define	PSEUDO(name, syscall_name, args)				      \
+  .text;								      \
+  SYSCALL_ERROR_HANDLER							      \
+  ENTRY (name)								      \
+    DO_CALL (POUND SYS_ify (syscall_name), args);			      \
+    tst.l %d0;								      \
+    jmi syscall_error;
+
+#ifdef PIC
+/* Store (- %d0) into errno through the GOT.  */
+#define SYSCALL_ERROR_HANDLER						      \
+syscall_error:								      \
+    move.l (errno@GOTPC.l, %pc), %a0;					      \
+    neg.l %d0;								      \
+    move.l %d0, (%a0);							      \
+    move.l POUND -1, %d0;						      \
+    /* Copy return value to %a0 for syscalls that are declared to return      \
+       a pointer (e.g., mmap).  */					      \
+    move.l %d0, %a0;							      \
+    rts;
+#else
+#define SYSCALL_ERROR_HANDLER	/* Nothing here; code in sysdep.S is used.  */
+#endif
+
+/* 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.  */
+
+#define DO_CALL(syscall, args)				      		      \
+    move.l syscall, %d0;						      \
+    DOARGS_##args							      \
+    trap POUND 0;							      \
+    UNDOARGS_##args
+
+#define	DOARGS_0	/* No arguments to frob.  */
+#define	UNDOARGS_0	/* No arguments to unfrob.  */
+#define	_DOARGS_0(n)	/* No arguments to frob.  */
+
+#define	DOARGS_1	_DOARGS_1 (4)
+#define	_DOARGS_1(n)	move.l n(%sp), %d1; _DOARGS_0 (n)
+#define	UNDOARGS_1	UNDOARGS_0
+
+#define	DOARGS_2	_DOARGS_2 (8)
+#define	_DOARGS_2(n)	move.l %d2, %a0; move.l n(%sp), %d2; _DOARGS_1 (n-4)
+#define	UNDOARGS_2	UNDOARGS_1; move.l %a0, %d2
+
+#define DOARGS_3	_DOARGS_3 (12)
+#define _DOARGS_3(n)	move.l %d3, %a1; move.l n(%sp), %d3; _DOARGS_2 (n-4)
+#define UNDOARGS_3	UNDOARGS_2; move.l %a1, %d3
+
+#define DOARGS_4	_DOARGS_4 (16)
+#define _DOARGS_4(n)	move.l %d4, -(%sp); move.l n+4(%sp), %d4; _DOARGS_3 (n)
+#define UNDOARGS_4	UNDOARGS_3; move.l (%sp)+, %d4
+
+#define DOARGS_5	_DOARGS_5 (20)
+#define _DOARGS_5(n)	move.l %d5, -(%sp); move.l n+4(%sp), %d5; _DOARGS_4 (n)
+#define UNDOARGS_5	UNDOARGS_4; move.l (%sp)+, %d5
+
+
+#define	ret	rts
+#if 0 /* Not used by Linux */
+#define	r0	%d0
+#define	r1	%d1
+#define	MOVE(x,y)	movel x , y
+#endif
+
+#endif	/* ASSEMBLER */