/* Copyright (C) 1999, 2000 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* 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 <features.h> #include <asm/unistd.h> #define _ERRNO_H 1 #include <bits/errno.h> #if defined __HAVE_ELF__ && defined __HAVE_SHARED__ #define PLTJMP(_x) _x##@PLT #else #define PLTJMP(_x) _x #endif /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ .text .text .align 4 .type __clone,@function .globl __clone; __clone: /* sanity check arguments. */ tst r4, r4 bt 0f tst r5, r5 bf/s 1f mov #+__NR_clone, r3 0: bra __syscall_error mov #-EINVAL, r4 1: /* insert the args onto the new stack */ mov.l r7, @-r5 /* save the function pointer as the 0th element */ mov.l r4, @-r5 /* do the system call */ mov r6, r4 trapa #0x12 mov r0, r1 #ifdef __sh2__ // 12 arithmetic shifts for the crappy sh2, because shad doesn't exist! shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 shar r1 #else mov #-12, r2 shad r2, r1 #endif not r1, r1 // r1=0 means r0 = -1 to -4095 tst r1, r1 // i.e. error in linux bf/s 2f tst r0, r0 bra __syscall_error mov r0, r4 2: bt 3f rts nop 3: /* thread starts */ mov.l @r15, r1 jsr @r1 mov.l @(4,r15), r4 /* we are done, passing the return value through r0 */ mov.l .L1, r1 #if defined __HAVE_ELF__ && defined __HAVE_SHARED__ mov.l r12, @-r15 sts.l pr, @-r15 mov r0, r4 mova .LG, r0 /* .LG from syscall_error.S */ mov.l .LG, r12 add r0, r12 mova .L1, r0 add r0, r1 jsr @r1 nop lds.l @r15+, pr rts mov.l @r15+, r12 #else jmp @r1 mov r0, r4 #endif .align 2 .L1: .long PLTJMP(_exit) .size __clone,.-__clone; .globl clone; clone = __clone #include "syscall_error.S"