diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/x86_64/syscall.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/x86_64/syscall.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/syscall.S b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/syscall.S new file mode 100644 index 0000000000..f6486b9e4d --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/syscall.S @@ -0,0 +1,42 @@ +/* Copyright (C) 2001-2017 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> + +/* Please consult the file sysdeps/unix/sysv/linux/x86-64/sysdep.h for + more information about the value -4095 used below. */ + +/* Usage: long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6) + We need to do some arg shifting, the syscall_number will be in + rax. */ + + + .text +ENTRY (syscall) + movq %rdi, %rax /* Syscall number -> rax. */ + movq %rsi, %rdi /* shift arg1 - arg5. */ + movq %rdx, %rsi + movq %rcx, %rdx + movq %r8, %r10 + movq %r9, %r8 + movq 8(%rsp),%r9 /* arg6 is on the stack. */ + syscall /* Do the system call. */ + cmpq $-4095, %rax /* Check %rax for error. */ + jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ + ret /* Return to caller. */ + +PSEUDO_END (syscall) |