| /* Copyright (C) 1996-2014 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> |
| #ifdef RESET_PID |
| #include <tls.h> |
| #endif |
| |
| #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 */ |
| #ifdef RESET_PID |
| /* 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: |
| #endif |
| jsr (%a0) |
| movel %d0, %d1 |
| movel #SYS_ify (exit), %d0 |
| trap #0 |
| cfi_endproc |
| |
| cfi_startproc |
| PSEUDO_END (__clone) |
| |
| weak_alias (__clone, clone) |
