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112 lines
2.8 KiB
ArmAsm
112 lines
2.8 KiB
ArmAsm
/* Copyright (C) 2005-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* vfork() is just a special case of clone(). */
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#include <sys/asm.h>
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#include <sysdep.h>
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#include <asm/unistd.h>
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#include <sgidefs.h>
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#include <tls.h>
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/* int vfork() */
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.text
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.set nomips16
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LOCALSZ= 1
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FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
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GPOFF= FRAMESZ-(1*SZREG)
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NESTED(__vfork,FRAMESZ,sp)
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#ifdef __PIC__
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SETUP_GP
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#endif
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PTR_SUBU sp, FRAMESZ
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cfi_adjust_cfa_offset (FRAMESZ)
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SETUP_GP64_REG (a5, __vfork)
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#ifdef __PIC__
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SAVE_GP (GPOFF)
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#endif
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#ifdef PROF
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# if (_MIPS_SIM != _ABIO32)
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PTR_S a5, GPOFF(sp)
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# endif
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.set noat
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move $1, ra
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# if (_MIPS_SIM == _ABIO32)
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subu sp,sp,8
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# endif
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jal _mcount
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.set at
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# if (_MIPS_SIM != _ABIO32)
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PTR_L a5, GPOFF(sp)
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# endif
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#endif
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PTR_ADDU sp, FRAMESZ
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cfi_adjust_cfa_offset (-FRAMESZ)
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/* Save the PID value. */
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READ_THREAD_POINTER(v1) /* Get the thread pointer. */
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lw a2, PID_OFFSET(v1) /* Load the saved PID. */
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subu a2, $0, a2 /* Negate it. */
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bnez a2, 1f /* If it was zero... */
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lui a2, 0x8000 /* use 0x80000000 instead. */
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1: sw a2, PID_OFFSET(v1) /* Store the temporary PID. */
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li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
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move a1, sp
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/* Do the system call */
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li v0,__NR_clone
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syscall
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/* Restore the old PID value in the parent. */
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beqz v0, 1f /* If we are the parent... */
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READ_THREAD_POINTER(v1) /* Get the thread pointer. */
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lw a2, PID_OFFSET(v1) /* Load the saved PID. */
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subu a2, $0, a2 /* Re-negate it. */
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lui a0, 0x8000 /* Load 0x80000000... */
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bne a2, a0, 2f /* ... compare against it... */
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li a2, 0 /* ... use 0 instead. */
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2: sw a2, PID_OFFSET(v1) /* Restore the PID. */
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1:
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cfi_remember_state
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bnez a3,L(error)
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/* Successful return from the parent or child. */
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RESTORE_GP64_REG
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ret
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/* Something bad happened -- no child created. */
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L(error):
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cfi_restore_state
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#ifdef __PIC__
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PTR_LA t9, __syscall_error
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RESTORE_GP64_REG
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jr t9
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#else
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RESTORE_GP64_REG
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j __syscall_error
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#endif
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END(__vfork)
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libc_hidden_def(__vfork)
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weak_alias (__vfork, vfork)
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strong_alias (__vfork, __libc_vfork)
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