/* Copyright (C) 1996-2017 Free Software Foundation, Inc. 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. */ #define _ERRNO_H #include <sysdep.h> #include <features.h> #include <bits/errno.h> #include <sys/syscall.h> #include "m68k_pic.S" /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, void *parent_tidptr, void *tls, void *child_tidptr) */ .text .align 4 .globl __clone .type __clone,@function __clone: /* Sanity check arguments. */ movel #-EINVAL, %d0 movel 4(%sp), %a0 /* no NULL function pointers */ tstl %a0 beq.w __syscall_error_trampoline movel 8(%sp), %a1 /* no NULL stack pointers */ tstl %a1 beq.w __syscall_error_trampoline /* Allocate space and copy the argument onto the new stack. */ movel 16(%sp), -(%a1) /* Do the system call */ movel 12(%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 #__NR_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 bmi.w __syscall_error_trampoline beq.w thread_start rts thread_start: cfi_startproc cfi_undefined (pc) /* Mark end of stack */ subl %fp, %fp /* terminate the stack frame */ jsr (%a0) movel %d0, %d1 movel #__NR_exit, %d0 trap #0 cfi_endproc cfi_startproc __syscall_error_trampoline: JUMP __syscall_error,%a0 .size __clone,.-__clone weak_alias(__clone,clone) libc_hidden_def(clone)