mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
113 lines
3.0 KiB
ArmAsm
113 lines
3.0 KiB
ArmAsm
/* Wrapper around clone system call. PowerPC64 version.
|
|
Copyright (C) 1997-2020 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
|
|
/* This is the only really unusual system call in PPC linux, but not
|
|
because of any weirdness in the system call itself; because of
|
|
all the freaky stuff we have to do to make the call useful. */
|
|
|
|
/* int [r3] clone(int (*fn)(void *arg) [r3], void *child_stack [r4],
|
|
int flags [r5], void *arg [r6], void *parent_tid [r7],
|
|
void *tls [r8], void *child_tid [r9]); */
|
|
|
|
ENTRY (__clone)
|
|
CALL_MCOUNT 7
|
|
|
|
/* Check for child_stack == NULL || fn == NULL. */
|
|
cmpdi cr0,r4,0
|
|
cmpdi cr1,r3,0
|
|
cror cr0*4+eq,cr1*4+eq,cr0*4+eq
|
|
beq- cr0,L(badargs)
|
|
|
|
/* Save some regs in the "red zone". */
|
|
std r29,-24(r1)
|
|
std r30,-16(r1)
|
|
std r31,-8(r1)
|
|
cfi_offset(r29,-24)
|
|
cfi_offset(r30,-16)
|
|
cfi_offset(r31,-8)
|
|
|
|
/* Set up stack frame for child. */
|
|
clrrdi r4,r4,4
|
|
li r0,0
|
|
stdu r0,-FRAME_MIN_SIZE_PARM(r4)
|
|
|
|
/* Save fn, args, stack across syscall. */
|
|
mr r30,r3 /* Function in r30. */
|
|
mr r29,r5 /* Flags in r29. */
|
|
mr r31,r6 /* Argument in r31. */
|
|
|
|
/* 'flags' argument is first parameter to clone syscall.
|
|
Second is the stack pointer, already in r4. */
|
|
mr r3,r5
|
|
/* Move the parent_tid, child_tid and tls arguments. */
|
|
mr r5,r7
|
|
mr r6,r8
|
|
mr r7,r9
|
|
|
|
/* End FDE now, because in the child the unwind info will be
|
|
wrong. */
|
|
cfi_endproc
|
|
|
|
/* Do the call. */
|
|
DO_CALL(SYS_ify(clone))
|
|
|
|
/* Check for child process. */
|
|
cmpdi cr1,r3,0
|
|
crandc cr1*4+eq,cr1*4+eq,cr0*4+so
|
|
bne- cr1,L(parent) /* The '-' is to minimise the race. */
|
|
|
|
std r2,FRAME_TOC_SAVE(r1)
|
|
/* Call procedure. */
|
|
PPC64_LOAD_FUNCPTR r30
|
|
mr r3,r31
|
|
bctrl
|
|
ld r2,FRAME_TOC_SAVE(r1)
|
|
|
|
DO_CALL(SYS_ify(exit))
|
|
/* We won't ever get here but provide a nop so that the linker
|
|
will insert a toc adjusting stub if necessary. */
|
|
nop
|
|
|
|
L(badargs):
|
|
cfi_startproc
|
|
li r3,EINVAL
|
|
TAIL_CALL_SYSCALL_ERROR
|
|
|
|
L(parent):
|
|
/* Parent. Restore registers & return. */
|
|
cfi_offset(r29,-24)
|
|
cfi_offset(r30,-16)
|
|
cfi_offset(r31,-8)
|
|
ld r29,-24(r1)
|
|
ld r30,-16(r1)
|
|
ld r31,-8(r1)
|
|
cfi_restore(r29)
|
|
cfi_restore(r30)
|
|
cfi_restore(r31)
|
|
|
|
PSEUDO_RET
|
|
|
|
END (__clone)
|
|
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|