diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/m68k/clone.S | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S new file mode 100644 index 0000000000..764f572e89 --- /dev/null +++ b/sysdeps/unix/sysv/linux/m68k/clone.S @@ -0,0 +1,134 @@ +/* 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) |