mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 22:00:08 +00:00
178 lines
4.2 KiB
ArmAsm
178 lines
4.2 KiB
ArmAsm
/* Copyright (C) 1996-2013 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 <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
|
|
.set nomips16
|
|
#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
|
|
cfi_adjust_cfa_offset (FRAMESZ)
|
|
SETUP_GP64_STACK (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
|
|
cfi_endproc
|
|
syscall
|
|
|
|
bnez a3,L(error)
|
|
beqz v0,L(thread_start)
|
|
|
|
/* Successful return from the parent */
|
|
cfi_startproc
|
|
cfi_adjust_cfa_offset (FRAMESZ)
|
|
SETUP_GP64_STACK_CFI (GPOFF)
|
|
cfi_remember_state
|
|
RESTORE_GP64_STACK
|
|
PTR_ADDU sp, FRAMESZ
|
|
cfi_adjust_cfa_offset (-FRAMESZ)
|
|
ret
|
|
|
|
/* Something bad happened -- no child created */
|
|
L(error):
|
|
cfi_restore_state
|
|
#ifdef __PIC__
|
|
PTR_LA t9,__syscall_error
|
|
RESTORE_GP64_STACK
|
|
PTR_ADDU sp, FRAMESZ
|
|
cfi_adjust_cfa_offset (-FRAMESZ)
|
|
jr t9
|
|
#else
|
|
RESTORE_GP64_STACK
|
|
PTR_ADDU sp, FRAMESZ
|
|
cfi_adjust_cfa_offset (-FRAMESZ)
|
|
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):
|
|
cfi_undefined ($31)
|
|
/* 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)
|