From 041cdc2769407c4d3869b218ad7ee7638e1c306e Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Wed, 24 May 2017 20:49:02 +0200
Subject: sparc64: add basic support

No NPTL, no LDSO support.
Bootup with Busybox Ash in Qemu working.
Testuite shows only two failures, but mksh continue/break
support doesn't work.
---
 libc/sysdeps/linux/sparc64/brk.S | 101 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 libc/sysdeps/linux/sparc64/brk.S

(limited to 'libc/sysdeps/linux/sparc64/brk.S')

diff --git a/libc/sysdeps/linux/sparc64/brk.S b/libc/sysdeps/linux/sparc64/brk.S
new file mode 100644
index 000000000..2d857af6c
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/brk.S
@@ -0,0 +1,101 @@
+/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* __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 <sysdep.h>
+#define _ERRNO_H
+#include <bits/errno.h>
+
+#ifdef __PIC__
+.section .bss
+	.align 8
+	.globl __curbrk
+__curbrk: .skip 8
+	.type __curbrk,@object
+	.size __curbrk,8
+#else
+.common __curbrk, 8, 8
+#endif
+
+	.text
+ENTRY (__brk)
+	save	%sp, -192, %sp
+	cfi_def_cfa_register(%fp)
+	cfi_window_save
+	cfi_register(%o7, %i7)
+#ifdef __PIC__
+	SETUP_PIC_REG(l7)
+#endif
+
+	LOADSYSCALL(brk)
+	mov	%i0, %o0
+
+	ta	0x6d
+
+	/* All the ways we can fail... */
+	bcs,pn	%xcc, .Lerr1
+	 nop
+	brz,pt	%i0, .Lok
+	 subcc	%i0, %o0, %g0
+	bne,pn	%xcc, .Lerr0
+	 nop
+
+	/* Update __curbrk and return cleanly.  */
+.Lok:
+#ifndef __PIC__
+	sethi	%hi(__curbrk), %g1
+	or	%g1, %lo(__curbrk), %g1
+#else
+	sethi	%gdop_hix22(__curbrk), %g1
+	xor	%g1, %gdop_lox10(__curbrk), %g1
+	ldx	[%l7 + %g1], %g1, %gdop(__curbrk)
+#endif
+	stx	%o0, [%g1]
+	mov	%g0, %i0
+
+	/* Don't use "ret" cause the preprocessor will eat it.  */
+	jmpl	%i7+8, %g0
+	 restore
+
+	/* What a horrible way to die.  */
+.Lerr0:	set	ENOMEM, %o0
+.Lerr1:
+#ifndef _LIBC_REENTRANT
+#ifndef __PIC__
+	sethi	%hi(errno), %g1
+	or	%g1, %lo(errno), %g1
+#else
+	sethi	%gdop_hix22(errno), %g1
+	xor	%g1, %gdop_lox10(errno), %g1
+	ldx	[%l7 + %g1], %g1, %gdop(errno)
+#endif
+	st	%o0, [%g1]
+#else
+	call	HIDDEN_JUMPTARGET(__errno_location)
+	 mov	%o0,%l1
+	st	%l1, [%o0]
+#endif
+	sub	%g0, 1, %i0
+	jmpl	%i7+8, %g0
+	 restore
+END (__brk)
+
+weak_alias (__brk, brk)
+libc_hidden_def(brk)
-- 
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