diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/syscall.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/syscall.S | 48 |
1 files changed, 48 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..c5582f82fd --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/syscall.S @@ -0,0 +1,48 @@ +/* Copyright (C) 2005-2014 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 <sysdep.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). */ + +ENTRY (syscall) + mov ip, sp + push {r4, r5, r6, r7} + cfi_adjust_cfa_offset (16) + cfi_rel_offset (r4, 0) + cfi_rel_offset (r5, 4) + cfi_rel_offset (r6, 8) + cfi_rel_offset (r7, 12) + mov r7, r0 + mov r0, r1 + mov r1, r2 + mov r2, r3 + ldmfd ip, {r3, r4, r5, r6} + swi 0x0 + pop {r4, r5, r6, r7} + cfi_adjust_cfa_offset (-16) + cfi_restore (r4) + cfi_restore (r5) + cfi_restore (r6) + cfi_restore (r7) + cmn r0, #4096 + it cc + RETINSTR(cc, lr) + b PLTJMP(syscall_error) +PSEUDO_END (syscall) |