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-rw-r--r--sysdeps/unix/sysv/linux/arm/syscall.S47
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/syscall.S b/sysdeps/unix/sysv/linux/arm/syscall.S
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+++ b/sysdeps/unix/sysv/linux/arm/syscall.S
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+/* Copyright (C) 1995, 1996 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+
+/* Please consult the file sysdeps/unix/sysv/linux/arm/sysdep.h for
+ more information about the value -4095 used below.*/
+
+ .text
+ENTRY (syscall)
+
+ /* Normally encoding the system call number in the instruction is
+ good. But we pay the price here. */
+
+ sub sp, sp, $0xc @ get 3 words on the stack
+ orr r0, r0, $0xef000000 @ make up a SWI instruction
+ orr r0, r0, $SWI_BASE
+ str r0, [sp]
+ ldr r0, _reti
+ str r0, [sp, $4]
+ adr r0, _ret
+ str r0, [sp, $8]
+ mov r0, r1
+ mov r1, r2
+ mov r2, r3
+ mov pc, sp
+_ret: add sp, sp, $0xc
+ RETINSTR(mov, pc, r14)
+
+_reti: .word 0xe51ff004 @ ldr pc, [pc, $4]
+
+PSEUDO_END (syscall)