mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
90 lines
2.3 KiB
ArmAsm
90 lines
2.3 KiB
ArmAsm
/* clone helper __or1k_clone for OpenRISC.
|
|
Copyright (C) 2022-2024 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., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include <tls.h>
|
|
#define __ASSEMBLY__
|
|
#include <linux/sched.h>
|
|
|
|
.text
|
|
ENTRY (__or1k_clone)
|
|
|
|
/* To handle GCC varargs we need to use our __clone wrapper to pop
|
|
everything from the stack for us.
|
|
Now everything is placed in the registers which saves us a lot
|
|
of trouble.
|
|
|
|
The userland implementation is:
|
|
|
|
int clone (int (*fn)(void *), void *child_stack,
|
|
int flags, void *arg, pid_t *ptid,
|
|
struct user_desc *tls, pid_t *ctid);
|
|
The kernel entry is:
|
|
|
|
int clone (long flags, void *child_stack, int *parent_tid,
|
|
int *child_tid, struct void *tls)
|
|
|
|
NB: tls isn't really an argument, it is read from r7 directly. */
|
|
|
|
/* First, align the stack to 4 bytes. */
|
|
l.xori r11, r0, -4
|
|
l.and r4, r4, r11
|
|
|
|
/* Put 'fn', 'arg' and 'flags' on the child stack. */
|
|
l.addi r4, r4, -12
|
|
l.sw 8(r4), r3
|
|
l.sw 4(r4), r6
|
|
l.sw 0(r4), r5
|
|
|
|
l.ori r3, r5, 0
|
|
/* The child_stack is already in r4. */
|
|
l.ori r5, r7, 0
|
|
l.lwz r6, 0(r1)
|
|
l.ori r7, r8, 0
|
|
|
|
DO_CALL (clone)
|
|
|
|
l.sfgeui r11, 0xf001
|
|
l.bf L(error)
|
|
l.nop
|
|
|
|
/* If we are not the child, return the pid. */
|
|
l.sfeqi r11, 0
|
|
l.bf L(thread_start)
|
|
l.nop
|
|
|
|
l.jr r9
|
|
l.nop
|
|
|
|
L(thread_start):
|
|
/* Load function from stack. */
|
|
l.lwz r11, 8(r1)
|
|
l.jalr r11
|
|
l.lwz r3, 4(r1)
|
|
|
|
/* Exit the child thread. */
|
|
l.ori r3, r11, 0
|
|
DO_CALL (exit)
|
|
|
|
L(error):
|
|
l.j SYSCALL_ERROR_NAME
|
|
l.ori r3, r11, 0
|
|
|
|
END (__or1k_clone)
|