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.

9 files changed, 503 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/m68k/brk.c b/sysdeps/unix/sysv/linux/m68k/brk.c
new file mode 100644
index 0000000000..3fd547545e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/brk.c
@@ -0,0 +1,52 @@
+/* brk system call for Linux/m68k.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sysdep.h>
+
+void *__curbrk;
+
+int
+__brk (void *addr)
+{
+  void *newbrk;
+
+  {
+    register long d0 __asm__ ("%d0");
+
+    asm ("move%.l %2, %%d1\n"
+	 "trap #0"		/* Perform the system call.  */
+	 : "=d" (d0)
+	 : "0" (SYS_ify (brk)), "g" (addr)
+	 : "%d0", "%d1");
+    newbrk = (void *) d0;
+  }
+  __curbrk = newbrk;
+
+  if (newbrk < addr)
+    {
+      errno = ENOMEM;
+      return -1;
+    }
+
+  return 0;
+}
+weak_alias (__brk, brk)
+
diff --git a/sysdeps/unix/sysv/linux/m68k/mmap.S b/sysdeps/unix/sysv/linux/m68k/mmap.S
new file mode 100644
index 0000000000..ed0480dfd7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/mmap.S
@@ -0,0 +1,44 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+#include <sysdep.h>
+
+	.text
+	SYSCALL_ERROR_HANDLER
+
+ENTRY (__mmap)
+
+	move.l #SYS_ify (mmap), %d0	/* System call number in %d0.  */
+
+	lea 4(%sp), %a0			/* Address of args is 1st arg.  */
+	move.l %a0, %d1
+
+        /* Do the system call trap.  */
+	trap #0
+
+	/* Kludge: negative numbers are among the legal return values.
+	   If %d0 is between -4096 and 0 then there was an error.  */
+	cmp.l #-4096, %d0
+	jhi syscall_error
+
+	/* Successful; return the syscall's value.  Copy it to %a0 because
+	   mmap is declared to return a pointer.  */
+	move.l %d0, %a0
+	rts
+
+weak_alias (__mmap, mmap)
diff --git a/sysdeps/unix/sysv/linux/m68k/select.S b/sysdeps/unix/sysv/linux/m68k/select.S
new file mode 100644
index 0000000000..2770df82d1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/select.S
@@ -0,0 +1,53 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+#define _ERRNO_H
+#include <errnos.h>
+
+/* Linux has two versions of the select system call.  The old one expected
+   one argument which must be a pointer to a struct which contains the
+   five values.  The new version expects the five arguments be given in the
+   registers.  First try the new version, if it's not available fall back
+   to the old version.  */
+
+	.text
+	SYSCALL_ERROR_HANDLER
+ENTRY (__select)
+
+#if 0 /* For now only use the old version.  */
+	DO_CALL (#SYS_ify (_newselect), 5)
+	tst.l %d0
+	jmi 1f
+	rts
+
+1:	move.l #-ENOSYS, %d1
+	cmp.l %d1, %d0
+	jne syscall_error	/* Real error */
+
+	/* Try again using the old syscall interface.  */
+#endif
+	lea 4(%sp), %a0
+	move.l %a0, %d1
+	move.l #SYS_ify (select), %d0
+	trap #0
+	tst.l %d0
+	jmi syscall_error
+	ret
+
+weak_alias (__select, select)
diff --git a/sysdeps/unix/sysv/linux/m68k/sigcontext.h b/sysdeps/unix/sysv/linux/m68k/sigcontext.h
new file mode 100644
index 0000000000..585b47993a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/sigcontext.h
@@ -0,0 +1,31 @@
+/* Structure describing state saved while handling a signal.  Linux/m68k version.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+/* State of this thread when the signal was taken.  */
+struct sigcontext
+{
+  __sigset_t sc_mask;
+  unsigned long sc_usp;
+  unsigned long sc_d0;
+  unsigned long sc_d1;
+  unsigned long sc_a0;
+  unsigned long sc_a1;
+  unsigned short sc_sr;
+  unsigned long sc_pc;
+};
diff --git a/sysdeps/unix/sysv/linux/m68k/sigreturn.S b/sysdeps/unix/sysv/linux/m68k/sigreturn.S
new file mode 100644
index 0000000000..7f6d643cb9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/sigreturn.S
@@ -0,0 +1,28 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+#include <sysdep.h>
+
+.text
+ENTRY (__sigreturn)
+	addq.l #4, %sp		/* Pop the return PC.  */
+	DO_CALL (#SYS_ify (sigreturn), 0)
+				/* Do the system call; it never returns.  */
+	/* NOTREACHED */
+
+weak_alias (__sigreturn, sigreturn)
diff --git a/sysdeps/unix/sysv/linux/m68k/socket.S b/sysdeps/unix/sysv/linux/m68k/socket.S
new file mode 100644
index 0000000000..a85f41c334
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/socket.S
@@ -0,0 +1,62 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+#include <sysdep.h>
+#include <sys/socketcall.h>
+
+#define P(a, b) P2(a, b)
+#define P2(a, b) a##b
+
+	.text
+	SYSCALL_ERROR_HANDLER
+
+/* The socket-oriented system calls are handled unusally in Linux.
+   They are all gated through the single `socketcall' system call number.
+   `socketcall' takes two arguments: the first is the subcode, specifying
+   which socket function is being called; and the second is a pointer to
+   the arguments to the specific function.
+
+   The .S files for the other calls just #define socket and #include this.  */
+
+.globl P(__,socket)
+ENTRY (P(__,socket))
+
+	/* Save registers.  */
+	move.l %d2, %a0
+
+	move.l #SYS_ify (socketcall), %d0 /* System call number in %d0.  */
+
+	/* Use ## so `socket' is a separate token that might be #define'd.  */
+	move.l #P (SOCKOP_,socket), %d1	/* Subcode is first arg to syscall.  */
+	lea 4(%sp), %a1			/* Address of args is 2nd arg.  */
+	move.l %a1, %d2
+
+        /* Do the system call trap.  */
+	trap #0
+
+	/* Restore registers.  */
+	move.l %a0, %d2
+
+	/* %d0 is < 0 if there was an error.  */
+	tst.l %d0
+	jmi syscall_error
+
+	/* Successful; return the syscall's value.  */
+	rts
+
+weak_alias (P(__,socket), socket)
diff --git a/sysdeps/unix/sysv/linux/m68k/syscall.S b/sysdeps/unix/sysv/linux/m68k/syscall.S
new file mode 100644
index 0000000000..2cc451c58b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/syscall.S
@@ -0,0 +1,31 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+#include <sysdep.h>
+
+	.text
+	SYSCALL_ERROR_HANDLER
+ENTRY (syscall)
+	move.l (%sp)+, %a0	/* Pop return address.  */
+	DO_CALL ((%sp), 5)	/* Frob the args and do the system call.  */
+	tst.l %d0		/* Check %d0 for error.  */
+	jmi error		/* Jump to error handler if negative.  */
+	jmp (%a0)		/* Return to caller.  */
+
+error:	pea (%a0)
+	jra syscall_error
diff --git a/sysdeps/unix/sysv/linux/m68k/sysdep.S b/sysdeps/unix/sysv/linux/m68k/sysdep.S
new file mode 100644
index 0000000000..895ea2770b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/sysdep.S
@@ -0,0 +1,71 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.  */
+
+/* Because the Linux version is in fact m68k/ELF and the start.? file
+   for this system (sysdeps/m68k/elf/start.S) is also used by The Hurd
+   and therefore this files must not contain the definition of the
+   `errno' variable (I don't know why, ask Roland), we have to define
+   it somewhere else.
+
+   ...and this place is here.  */
+	.bss
+	.globl errno
+	.type errno,@object
+errno:	.space 4
+	.size errno,4
+	.globl _errno
+	.type _errno,@object
+_errno = errno	/* This name is expected by hj libc.so.5 startup code.  */
+	.text
+
+/* The following code is not used at all in the shared library.
+   The PIC system call stubs set errno themselves.  */
+
+#ifndef	PIC
+
+#include <sysdep.h>
+#define _ERRNO_H
+#include <errnos.h>
+
+.globl errno
+.globl __syscall_error
+
+/* The syscall stubs jump here when they detect an error.  */
+
+.globl __syscall_error
+__syscall_error:
+	neg.l %d0
+
+#if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
+	/* We translate the system's EWOULDBLOCK error into EAGAIN.
+	   The GNU C library always defines EWOULDBLOCK==EAGAIN.
+	   EWOULDBLOCK_sys is the original number.  */
+	move.l #EWOULDBLOCK_sys, %d1
+	cmp.l %d0, %d1
+	jne 1f
+	move.l #EAGAIN, %d0
+1:
+#endif
+
+	move.l %d0, errno
+	move.l #-1, %d0
+	/* Copy return value to %a0 for syscalls that are declared to
+	   return a pointer.  */
+	move.l %d0, %a0
+	rts
+#endif /* PIC */
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 */