diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/clone.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/clone.S | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/clone.S b/sysdeps/unix/sysv/linux/x86_64/clone.S deleted file mode 100644 index d5c2d07885..0000000000 --- a/sysdeps/unix/sysv/linux/x86_64/clone.S +++ /dev/null @@ -1,107 +0,0 @@ -/* 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/>. */ - -/* clone() is even more special than fork() as it mucks with stacks - and invokes a function in the right context after its all over. */ - -#include <sysdep.h> -#define _ERRNO_H 1 -#include <bits/errno.h> -#include <asm-syntax.h> - -#define CLONE_VM 0x00000100 - -/* The userland implementation is: - int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg), - the kernel entry is: - int clone (long flags, void *child_stack). - - The parameters are passed in register and on the stack from userland: - rdi: fn - rsi: child_stack - rdx: flags - rcx: arg - r8d: TID field in parent - r9d: thread pointer -%esp+8: TID field in child - - The kernel expects: - rax: system call number - rdi: flags - rsi: child_stack - rdx: TID field in parent - r10: TID field in child - r8: thread pointer */ - - - .text -ENTRY (__clone) - /* Sanity check arguments. */ - movq $-EINVAL,%rax - testq %rdi,%rdi /* no NULL function pointers */ - jz SYSCALL_ERROR_LABEL - testq %rsi,%rsi /* no NULL stack pointers */ - jz SYSCALL_ERROR_LABEL - - /* Insert the argument onto the new stack. */ - subq $16,%rsi - movq %rcx,8(%rsi) - - /* Save the function pointer. It will be popped off in the - child in the ebx frobbing below. */ - movq %rdi,0(%rsi) - - /* Do the system call. */ - movq %rdx, %rdi - movq %r8, %rdx - movq %r9, %r8 - mov 8(%rsp), %R10_LP - movl $SYS_ify(clone),%eax - - /* End FDE now, because in the child the unwind info will be - wrong. */ - cfi_endproc; - syscall - - testq %rax,%rax - jl SYSCALL_ERROR_LABEL - jz L(thread_start) - - ret - -L(thread_start): - cfi_startproc; - /* Clearing frame pointer is insufficient, use CFI. */ - cfi_undefined (rip); - /* Clear the frame pointer. The ABI suggests this be done, to mark - the outermost frame obviously. */ - xorl %ebp, %ebp - - /* Set up arguments for the function call. */ - popq %rax /* Function to call. */ - popq %rdi /* Argument. */ - call *%rax - /* Call exit with return value from function call. */ - movq %rax, %rdi - call HIDDEN_JUMPTARGET (_exit) - cfi_endproc; - - cfi_startproc; -PSEUDO_END (__clone) - -libc_hidden_def (__clone) -weak_alias (__clone, clone) |