diff options
Diffstat (limited to 'libc/sysdeps/linux/xtensa/syscall.S')
| -rw-r--r-- | libc/sysdeps/linux/xtensa/syscall.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/xtensa/syscall.S b/libc/sysdeps/linux/xtensa/syscall.S new file mode 100644 index 000000000..955e889cf --- /dev/null +++ b/libc/sysdeps/linux/xtensa/syscall.S @@ -0,0 +1,42 @@ +/* Copyright (C) 2005, 2007 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., 51 Franklin Street - Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#include "sysdep.h" + +/* The register layout upon entering the function is: + + arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5 + --------- -------------- ---------------------------------- + function a2 a3, a4, a5, a6, a7, (sp) + syscall a2 a6, a3, a4, a5, a8, a9 + */ + +ENTRY (syscall) + l32i a9, a1, 16 /* load extra argument from stack */ + mov a8, a7 + mov a7, a3 /* preserve a3 in a7 */ + mov a3, a4 + mov a4, a5 + mov a5, a6 + mov a6, a7 + syscall + movi a4, -4095 + bgeu a2, a4, SYSCALL_ERROR_LABEL +.Lpseudo_end: + retw +PSEUDO_END (syscall) |