/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996. 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> #include <sys/regdef.h> #define _ERRNO_H 1 #include <bits/errno.h> #include <sys/asm.h> /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ .text .globl clone ; .align 2; .type clone,@function; .ent clone, 0; clone: .frame sp, 4*SZREG, sp #ifdef __PIC__ .set noreorder .cpload $25 .set reorder subu sp,32 .cprestore 16 #else subu sp,32 #endif /* Sanity check arguments. */ li v0,EINVAL beqz a0,error /* No NULL function pointers. */ beqz a1,error /* No NULL stack pointers. */ subu a1,32 /* Reserve argument save space. */ sw a0,0(a1) /* Save function pointer. */ sw a3,4(a1) /* Save argument pointer. */ /* Do the system call */ move a0,a2 li v0,__NR_clone syscall bnez a3,error beqz v0,__thread_start /* Successful return from the parent */ addiu sp,32 j $31 ; nop /* Something bad happened -- no child created */ error: addiu sp,32 /* uClibc change -- start */ move a0,v0 /* Pass return val to C function. */ /* uClibc change -- stop */ #ifdef __PIC__ la t9,__syscall_error jr t9 #else j __syscall_error #endif .end clone /* Load up the arguments to the function. Put this block of code in its own function so that we can terminate the stack trace with our debug info. */ .globl __thread_start; .align 2; .ent __thread_start, 0; __thread_start: /* cp is already loaded. */ .cprestore 16 /* The stackframe has been created on entry of clone(). */ /* Restore the arg for user's function. */ lw t9,0(sp) /* Function pointer. */ lw a0,4(sp) /* Argument pointer. */ /* Call the user's function. */ jal t9 /* Call _exit rather than doing it inline for breakpoint purposes. */ move a0,v0 jal HIDDEN_JUMPTARGET(_exit) .end __thread_start