From ee92c0fe5c1b9d59508273916e2c9a75b68dbc13 Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Thu, 21 Apr 2016 01:25:29 +0200
Subject: nds32: add support for new architecture

Add support for Andes Technology NDS32 architecture.
See here http://www.andestech.com/en/index/index.htm for more
informaton. Verification of the port from an older uClibc
port was done on a sponsored AG101p board.

The testsuite only has 5 errors, three are related to
an existing bug in dlclose() with LT.old, also happening
on cris32 and m68k.

Failures to fallocate/posix_fallocate are unresolved.

Thanks to Andes Technology sponsoring the hardware and
being very helpful while doing the uClibc-ng porting.

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
---
 ldso/ldso/nds32/resolve.S | 76 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 ldso/ldso/nds32/resolve.S

(limited to 'ldso/ldso/nds32/resolve.S')

diff --git a/ldso/ldso/nds32/resolve.S b/ldso/ldso/nds32/resolve.S
new file mode 100644
index 000000000..8c53850d7
--- /dev/null
+++ b/ldso/ldso/nds32/resolve.S
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+# define STACK_PUSH
+# define STACK_POP
+#else
+# define STACK_PUSH     addi   $sp,    $sp,    -24
+# define STACK_POP      addi   $sp,    $sp,    24
+#endif
+
+ .text
+ .align 4      ! 16 byte boundary
+ .globl _dl_linux_resolve
+ .type _dl_linux_resolve,#function
+ .pic
+
+_dl_linux_resolve:
+	! we get called with
+	! 	lp contains the return address from this call
+	!	r16 contains offset to target reloc entry
+	!	r17 contains GOT[1] (identity of taget lib)
+	!  ta is GOT[2] (starting address of this function)
+
+	! save arguments r0 - r5 and gp, lp
+	smw.adm	$r0,	[$sp],	$r5,	6
+
+	! init gp
+#ifdef __NDS32_N1213_43U1H__
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	LO12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$ta,	$gp
+#else
+	mfusr	$ta,	$PC
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	LO12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$ta,	$gp
+#endif
+
+	! #ifdef __NDS32_ABI_1__
+	! adjust stack
+	!addi	$sp,	$sp,	-24
+	STACK_PUSH
+	! #endif
+
+	! set arguments
+	addi	$r0,	$r17,	0
+	!addi	$r1,	$r16,	0
+	slli    $r1,    $r16,   2
+	slli    $r16,   $r16,   3
+	add     $r1,    $r1,    $r16
+
+	! comment out profiling argument
+	!addi	$r2,	$lp,	0
+
+	! call fixup routine
+	bal	_dl_linux_resolver@PLT
+
+	! save the return
+	addi	$ta,	$r0,	0
+
+	! #ifdef __NDS32_ABI_1__
+	! adjust sp
+	!addi	$sp,	$sp,	24
+	STACK_POP
+	! #endif
+
+	! reload registers
+	lmw.bim	$r0,	[$sp],	$r5,	6
+
+	! jump to the newly found address
+	jr		$ta
+
+.size _dl_linux_resolve, .-_dl_linux_resolve
-- 
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