Revert "syscall.c: Use common syscall.c for ARM"

This reverts commit b1913a876059949e6c309bafade55e9425ef33fb.
OABI is still a requirement. So we override the common syscall
implementation specifically for arm port.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

libc/sysdeps/linux/arm/Makefile.arch

@@ -19,9 +19,12 @@ ifeq ($(CONFIG_ARM_EABI),y)
 CSRC += aeabi_assert.c aeabi_atexit.c aeabi_errno_addr.c \
 	aeabi_localeconv.c aeabi_memclr.c aeabi_memcpy.c \
 	aeabi_memmove.c aeabi_memset.c find_exidx.c
+SSRC += syscall-eabi.S
 ifeq ($(UCLIBC_HAS_WCHAR),y)
 CSRC += aeabi_mb_cur_max.c
 endif
+else
+CSRC += syscall.c
 endif
 
 ifeq ($(CONFIG_ARM_EABI),y)

libc/sysdeps/linux/arm/syscall-eabi.S

@@ -0,0 +1,73 @@
+/* Copyright (C) 2005 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+#include <bits/arm_asm.h>
+
+/* In the EABI syscall interface, we don't need a special syscall to
+   implement syscall().  It won't work reliably with 64-bit arguments
+   (but that is true on many modern platforms).  */
+
+.text
+.global syscall
+.type syscall,%function
+.align 4
+#if defined(THUMB1_ONLY)
+.thumb_func
+syscall:
+	push	{r4, r5, r6, r7}
+	mov	ip, r0
+	mov	r0, r1
+	mov	r1, r2
+	mov	r2, r3
+	add	r7, sp, #(4 * 4)
+	ldmia	r7!, {r3, r4, r5, r6}
+	mov	r7, ip
+	swi	0x0
+	pop	{r4, r5, r6, r7}
+	ldr	r1, =0xfffff000
+	cmp	r0, r1
+	bcs	1f
+	bx lr
+1:
+	push	{r3, lr}
+	bl	__syscall_error
+	POP_RET
+.pool
+#else
+syscall:
+	mov	ip, sp
+	stmfd	sp!, {r4, r5, r6, r7}
+	mov	r7, r0
+	mov	r0, r1
+	mov	r1, r2
+	mov	r2, r3
+	ldmfd	ip, {r3, r4, r5, r6}
+	swi	0x0
+	ldmfd	sp!, {r4, r5, r6, r7}
+	cmn	r0, #4096
+	IT(t, cc)
+#if defined(__USE_BX__)
+	bxcc	lr
+#else
+	movcc	pc, lr
+#endif
+	b	__syscall_error
+#endif
+
+.size syscall,.-syscall

libc/sysdeps/linux/arm/syscall.c

@@ -0,0 +1,53 @@
+/* vi: set sw=4 ts=4: */
+/* syscall for arm/uClibc
+ *
+ * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+
+long syscall(long sysnum, long a, long b, long c, long d, long e, long f)
+{
+#if !defined(__thumb__)
+	register long _r0 __asm__("r0")=(long)(sysnum);
+	register long _r6 __asm__("r6")=(long)(f);
+	register long _r5 __asm__("r5")=(long)(e);
+	register long _r4 __asm__("r4")=(long)(d);
+	register long _r3 __asm__("r3")=(long)(c);
+	register long _r2 __asm__("r2")=(long)(b);
+	register long _r1 __asm__("r1")=(long)(a);
+	__asm__ __volatile__(
+			"swi %1"
+			: "=r"(_r0)
+			: "i"(__NR_syscall), "r"(_r0), "r"(_r1),
+			"r"(_r2), "r"(_r3), "r"(_r4), "r"(_r5),
+			"r"(_r6)
+			: "memory");
+#else
+	register long _r7 __asm__("r7")=(long)(sysnum);
+	register long _r5 __asm__("r5")=(long)(f);
+	register long _r4 __asm__("r4")=(long)(e);
+	register long _r3 __asm__("r3")=(long)(d);
+	register long _r2 __asm__("r2")=(long)(c);
+	register long _r1 __asm__("r1")=(long)(b);
+	register long _r0 __asm__("r0")=(long)(a);
+	__asm__ __volatile__(
+			"swi 0"
+			: "=r"(_r0)
+			: "r"(_r0), "r"(_r1), "r"(_r2), "r"(_r3),
+			"r"(_r4), "r"(_r5), "r"(_r7)
+			: "memory");
+#endif
+	if(_r0 >=(unsigned long) -4095) {
+		long err = _r0;
+		(*__errno_location())=(-err);
+		_r0=(unsigned long) -1;
+	}
+	return (long) _r0;
+}