From dba942c80dc2cfa5768a856fff98e22a755fdd27 Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@uclibc-ng.org>
Date: Tue, 4 Oct 2016 06:51:35 +0200
Subject: add experimental aarch64 support

Ported over from GNU C Library and runtime tested in Qemu.
---
 ldso/ldso/aarch64/resolve.S | 97 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 ldso/ldso/aarch64/resolve.S

(limited to 'ldso/ldso/aarch64/resolve.S')

diff --git a/ldso/ldso/aarch64/resolve.S b/ldso/ldso/aarch64/resolve.S
new file mode 100644
index 000000000..3b907c46c
--- /dev/null
+++ b/ldso/ldso/aarch64/resolve.S
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 by Waldemar Brodkorb <wbx@uclibc-ng.org>
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ * ported from GNU libc
+ */
+
+/* Copyright (C) 2005-2016 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 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/>.  */
+
+#include <features.h>
+
+#define PTR_REG(n)		x##n
+#define PTR_LOG_SIZE		3
+#define PTR_SIZE	(1<<PTR_LOG_SIZE)
+
+#define ip0 x16
+#define ip0l PTR_REG (16)
+#define ip1 x17
+#define lr  x30
+
+/* RELA relocatons are 3 pointers */
+#define RELA_SIZE (PTR_SIZE * 3)
+
+ .text
+ .globl _dl_linux_resolve
+ .type _dl_linux_resolve, %function
+ .align 2
+
+_dl_linux_resolve:
+	/* AArch64 we get called with:
+	   ip0		&PLTGOT[2]
+	   ip1		temp(dl resolver entry point)
+	   [sp, #8]	lr
+	   [sp, #0]	&PLTGOT[n]
+	 */
+
+	/* Save arguments.  */
+	stp	x8, x9, [sp, #-(80+8*16)]!
+	stp	x6, x7, [sp,  #16]
+	stp	x4, x5, [sp,  #32]
+	stp	x2, x3, [sp,  #48]
+	stp	x0, x1, [sp,  #64]
+	stp	q0, q1, [sp, #(80+0*16)]
+	stp	q2, q3, [sp, #(80+2*16)]
+	stp	q4, q5, [sp, #(80+4*16)]
+	stp	q6, q7, [sp, #(80+6*16)]
+
+	/* Get pointer to linker struct.  */
+	ldr	PTR_REG (0), [ip0, #-PTR_SIZE]
+
+	/* Prepare to call _dl_linux_resolver().  */
+	ldr	x1, [sp, 80+8*16]	/* Recover &PLTGOT[n] */
+
+	sub     x1, x1, ip0
+	add     x1, x1, x1, lsl #1
+	lsl     x1, x1, #3
+	sub     x1, x1, #(RELA_SIZE<<3)
+	lsr     x1, x1, #3
+
+	/* Call resolver routine.  */
+	bl	_dl_linux_resolver
+
+	/* Save the return.  */
+	mov	ip0, x0
+
+	/* Get arguments and return address back.  */
+	ldp	q0, q1, [sp, #(80+0*16)]
+	ldp	q2, q3, [sp, #(80+2*16)]
+	ldp	q4, q5, [sp, #(80+4*16)]
+	ldp	q6, q7, [sp, #(80+6*16)]
+	ldp	x0, x1, [sp, #64]
+	ldp	x2, x3, [sp, #48]
+	ldp	x4, x5, [sp, #32]
+	ldp	x6, x7, [sp, #16]
+	ldp	x8, x9, [sp], #(80+8*16)
+
+	ldp	ip1, lr, [sp], #16
+
+	/* Jump to the newly found address.  */
+	br	ip0
+
+.size _dl_linux_resolve, .-_dl_linux_resolve
-- 
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