diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/syscall.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/arm/syscall.S | 47 |
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 new file mode 100644 index 0000000000..7a87278303 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/syscall.S @@ -0,0 +1,47 @@ +/* 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) |