diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/mips/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/clone.S | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/clone.S b/sysdeps/unix/sysv/linux/mips/clone.S new file mode 100644 index 0000000000..043f5921cb --- /dev/null +++ b/sysdeps/unix/sysv/linux/mips/clone.S @@ -0,0 +1,114 @@ +/* Copyright (C) 1996, 1997, 2000, 2003 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, 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 <sys/asm.h> +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ + + .text +LOCALSZ= 1 +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. */ + + + /* Do the system call */ + move a0,a2 + 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 + ret + + /* Something bad happened -- no child created */ +L(error): +#ifdef __PIC__ + PTR_LA t9,__syscall_error + RESTORE_GP64 + PTR_ADDU sp, FRAMESZ + jr t9 +#else + RESTORE_GP64 + PTR_ADDU sp, 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): + /* cp is already loaded. */ + SAVE_GP (GPOFF) + /* The stackframe has been created on entry of clone(). */ + /* 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 + END(__thread_start) + +weak_alias(__clone, clone) |