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glibc/sysdeps/unix/sysv/linux/m68k/clone.S
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de) | |
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 <tls.h> | |
#define CLONE_VM 0x00000100 | |
#define CLONE_THREAD 0x00010000 | |
/* 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. */ | |
movel #-EINVAL, %d0 | |
movel 4(%sp), %a0 /* no NULL function pointers */ | |
tstl %a0 | |
jeq SYSCALL_ERROR_LABEL | |
movel 8(%sp), %a1 /* no NULL stack pointers */ | |
tstl %a1 | |
jeq SYSCALL_ERROR_LABEL | |
/* Allocate space and copy the argument onto the new stack. */ | |
movel 16(%sp), -(%a1) | |
/* Do the system call */ | |
movel 12+0(%sp), %d1 /* get flags */ | |
movel %d3, -(%a1) /* save %d3 and get parent_tidptr */ | |
movel %d3, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
cfi_rel_offset (%d3, 0) | |
movel 20+4(%sp), %d3 | |
movel %d4, -(%a1) /* save %d4 and get child_tidptr */ | |
movel %d4, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
cfi_rel_offset (%d4, 0) | |
movel 28+8(%sp), %d4 | |
movel %d5, -(%a1) /* save %d5 and get tls */ | |
movel %d5, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
cfi_rel_offset (%d5, 0) | |
movel 24+12(%sp), %d5 | |
/* save %d2 and get stack pointer */ | |
#ifdef __mcoldfire__ | |
movel %d2, -(%a1) | |
movel %d2, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
cfi_rel_offset (%d2, 0) | |
movel %a1, %d2 | |
#else | |
exg %d2, %a1 /* save %d2 and get stack pointer */ | |
cfi_register (%d2, %a1) | |
#endif | |
movel #SYS_ify (clone), %d0 | |
/* End FDE now, because in the child the unwind info will be | |
wrong. */ | |
cfi_endproc | |
trap #0 | |
#ifdef __mcoldfire__ | |
movel (%sp)+, %d2 | |
#else | |
exg %d2, %a1 /* restore %d2 */ | |
#endif | |
movel (%sp)+, %d5 /* restore %d5, %d4 and %d3 */ | |
movel (%sp)+, %d4 | |
movel (%sp)+, %d3 | |
tstl %d0 | |
jmi SYSCALL_ERROR_LABEL | |
jeq thread_start | |
rts | |
thread_start: | |
cfi_startproc | |
cfi_undefined (pc) /* Mark end of stack */ | |
subl %fp, %fp /* terminate the stack frame */ | |
/* Check and see if we need to reset the PID. */ | |
movel %d1, %a1 | |
andl #CLONE_THREAD, %d1 | |
jne donepid | |
movel %a1, %d1 | |
movel #-1, %d0 | |
andl #CLONE_VM, %d1 | |
jne gotpid | |
movel #SYS_ify (getpid), %d0 | |
trap #0 | |
gotpid: | |
movel %a0, -(%sp) | |
movel %d0, -(%sp) | |
bsrl __m68k_read_tp@PLTPC | |
movel (%sp)+, %d0 | |
movel %d0, PID_OFFSET(%a0) | |
movel %d0, TID_OFFSET(%a0) | |
movel (%sp)+, %a0 | |
donepid: | |
jsr (%a0) | |
movel %d0, %d1 | |
movel #SYS_ify (exit), %d0 | |
trap #0 | |
cfi_endproc | |
cfi_startproc | |
PSEUDO_END (__clone) | |
libc_hidden_def (__clone) | |
weak_alias (__clone, clone) |