96 lines
2.5 KiB
ArmAsm
96 lines
2.5 KiB
ArmAsm
/* clone() implementation for Nios II.
|
|
Copyright (C) 2008-2016 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andrew Jenner <andrew@codesourcery.com>, 2008.
|
|
|
|
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 <tcb-offsets.h>
|
|
|
|
#define CLONE_VM 0x00000100
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
|
|
void *parent_tidptr, void *tls, void *child_tidptr) */
|
|
|
|
.text
|
|
ENTRY(__clone)
|
|
/* Sanity check arguments. */
|
|
movi r2, EINVAL
|
|
/* No NULL function pointers. */
|
|
beq r4, zero, SYSCALL_ERROR_LABEL
|
|
/* No NULL stack pointers. */
|
|
beq r5, zero, SYSCALL_ERROR_LABEL
|
|
|
|
subi r5, r5, 8 /* Reserve argument save space. */
|
|
stw r4, 4(r5) /* Save function pointer. */
|
|
stw r7, 0(r5) /* Save argument pointer. */
|
|
|
|
/* Load arguments. */
|
|
mov r4, r6
|
|
ldw r6, 0(sp)
|
|
ldw r7, 8(sp)
|
|
ldw r8, 4(sp)
|
|
|
|
/* Do the system call. */
|
|
movi r2, SYS_ify (clone)
|
|
|
|
/* End FDE now, because in the child the unwind info will be
|
|
wrong. */
|
|
cfi_endproc
|
|
trap
|
|
|
|
/* Check for errors. */
|
|
bne r7, zero, SYSCALL_ERROR_LABEL
|
|
/* See if we're on the newly created thread. */
|
|
beq r2, zero, thread_start
|
|
/* Successful return from the parent */
|
|
ret
|
|
|
|
thread_start:
|
|
cfi_startproc
|
|
cfi_undefined (ra)
|
|
|
|
ldw r5, 4(sp) /* Function pointer. */
|
|
ldw r4, 0(sp) /* Argument pointer. */
|
|
addi sp, sp, 8
|
|
|
|
/* Call the user's function. */
|
|
callr r5
|
|
|
|
/* _exit with the result. */
|
|
mov r4, r2
|
|
#ifdef PIC
|
|
nextpc r22
|
|
1: movhi r8, %hiadj(_gp_got - 1b)
|
|
addi r8, r8, %lo(_gp_got - 1b)
|
|
add r22, r22, r8
|
|
ldw r8, %call(HIDDEN_JUMPTARGET(_exit))(r22)
|
|
jmp r8
|
|
#else
|
|
jmpi _exit
|
|
#endif
|
|
cfi_endproc
|
|
|
|
cfi_startproc
|
|
PSEUDO_END (__clone)
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|