123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172 |
- /* Copyright (C) 1996, 1997, 2000, 2003, 2005 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ralf Baechle <ralf@linux-mips.org>, 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, 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 <features.h>
- #include <sys/asm.h>
- #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
- #if _MIPS_SIM == _ABIO32
- # define EXTRA_LOCALS 1
- #else
- # define EXTRA_LOCALS 0
- #endif
- LOCALSZ= 4
- FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
- GPOFF= FRAMESZ-(1*SZREG)
- NESTED(clone,4*SZREG,sp)
- #ifdef __PIC__
- SETUP_GP
- #endif
- PTR_SUBU sp, FRAMESZ
- SETUP_GP64 (GPOFF, clone)
- #ifdef __PIC__
- SAVE_GP (GPOFF)
- #endif
- #ifdef PROF
- .set noat
- move $1,ra
- jal _mcount
- .set at
- #endif
- /* Sanity check arguments. */
- li v0,EINVAL
- beqz a0,L(error) /* No NULL function pointers. */
- beqz a1,L(error) /* No NULL stack pointers. */
- PTR_SUBU a1,32 /* Reserve argument save space. */
- PTR_S a0,0(a1) /* Save function pointer. */
- PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
- #ifdef RESET_PID
- LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
- #endif
- move a0,a2
- /* Shuffle in the last three arguments - arguments 5, 6, and 7 to
- this function, but arguments 3, 4, and 5 to the syscall. */
- #if _MIPS_SIM == _ABIO32
- PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp)
- PTR_S a2,16(sp)
- PTR_L a2,(FRAMESZ+16)(sp)
- PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp)
- #else
- move a2,a4
- move a3,a5
- move a4,a6
- #endif
- /* Do the system call */
- li v0,__NR_clone
- syscall
- bnez a3,L(error)
- beqz v0,L(thread_start)
- /* Successful return from the parent */
- RESTORE_GP64
- PTR_ADDU sp, FRAMESZ
- j $31 ; nop
- /* Something bad happened -- no child created */
- L(error):
- #ifdef __PIC__
- PTR_LA t9,__syscall_error
- RESTORE_GP64
- PTR_ADDU sp, FRAMESZ
- /* uClibc change -- start */
- move a0,v0 /* Pass return val to C function. */
- /* uClibc change -- stop */
- jr t9
- #else
- RESTORE_GP64
- PTR_ADDU sp, FRAMESZ
- /* uClibc change -- start */
- move a0,v0 /* Pass return val to C function. */
- /* uClibc change -- stop */
- 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. */
- ENTRY(__thread_start)
- L(thread_start):
- /* cp is already loaded. */
- SAVE_GP (GPOFF)
- /* The stackframe has been created on entry of clone(). */
- #ifdef RESET_PID
- /* Check and see if we need to reset the PID. */
- LONG_L a0,(PTRSIZE*2)(sp)
- and a1,a0,CLONE_THREAD
- beqz a1,L(restore_pid)
- L(donepid):
- #endif
- /* Restore the arg for user's function. */
- PTR_L t9,0(sp) /* Function pointer. */
- PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
- /* Call the user's function. */
- jal t9
- /* Call _exit rather than doing it inline for breakpoint purposes. */
- move a0,v0
- #ifdef __PIC__
- PTR_LA t9,_exit
- jalr t9
- #else
- jal _exit
- #endif
- #ifdef RESET_PID
- L(restore_pid):
- and a1,a0,CLONE_VM
- li v0,-1
- bnez a1,L(gotpid)
- li v0,__NR_getpid
- syscall
- L(gotpid):
- READ_THREAD_POINTER(v1)
- INT_S v0,PID_OFFSET(v1)
- INT_S v0,TID_OFFSET(v1)
- b L(donepid)
- #endif
- END(__thread_start)
- weak_alias(clone, __clone)
|