First pass attempt at an alpha port

1 files changed, 87 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/alpha/brk.S b/libc/sysdeps/linux/alpha/brk.S
new file mode 100644
index 000000000..aa8db2ba9
--- /dev/null
+++ b/libc/sysdeps/linux/alpha/brk.S
@@ -0,0 +1,87 @@
+/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Brendan Kehoe <brendan@zen.org>, 1993.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* __brk is a special syscall under Linux since it never returns an
+   error.  Instead, the error condition is indicated by returning the old
+   break value (instead of the new, requested one).  */
+
+#include <features.h>
+#define _ERRNO_H
+#include <bits/errno.h>
+
+#ifdef PIC
+.section .bss
+	.align 3
+	.globl __curbrk
+__curbrk: .skip 8
+	.type __curbrk,@object
+	.size __curbrk,8
+#else
+.comm __curbrk, 8
+#endif
+
+	.text
+.globl  __brk;
+.align 3;
+.ent  __brk , 0;
+
+__brk:
+    .frame $30 ,   8 , $26
+	ldgp	$29, 0($27)
+	subq	$30, 8, $30
+#ifdef PROF
+	.set noat
+	lda	AT, _mcount
+	jsr	AT, (AT), _mcount
+	.set at
+#endif
+	.prologue 1
+
+	/* Save the requested brk across the system call.  */
+	stq	$16, 0($30)
+
+	ldiq	$0, __NR_brk
+	call_pal 131
+
+	ldq	$16, 0($30)
+
+	/* Be prepared for an OSF-style brk.  */
+	bne	$19, $err1
+	beq	$0, $ok
+
+	/* Correctly handle the brk(0) query case.  */
+	cmoveq	$16, $0, $16
+	xor	$16, $0, $1
+	bne	$1, $err0
+
+	/* Update __curbrk and return cleanly.  */
+	mov	$31, $0
+$ok:	stq	$16, __curbrk
+	addq	$30, 8, $30
+	ret
+
+	/* What a horrible way to die.  */
+$err0:	ldi	$0, ENOMEM
+$err1:	addq	$30, 8, $30
+	jmp	$31, __syscall_error
+
+	.end __brk
+
+.weak    brk;
+    brk    =   __brk