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76 lines
2.1 KiB
ArmAsm
76 lines
2.1 KiB
ArmAsm
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/* Copyright (C) 1999,2000 Free Software Foundation, Inc.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* clone is even more special than fork as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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/*
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* Used for both clone and fork system calls. Note that if fn is NULL
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* then clone was called from fork.
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*/
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ENTRY(__clone)
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add r2 = -16, r33 // save space for fn and arg
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cmp.ne p6,p0 = 0,r33
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;;
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(p6) add r33 = -16, r33
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add r12 = -16, r12
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;;
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(p6) st8 [r2] = r32, 8 // save fn for child
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st8 [r12] = r32 // save fn for parent
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;;
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(p6) st8 [r2] = r35 // save arg for child
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mov r32 = r34 // put flags in out0
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DO_CALL (SYS_ify (clone))
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1:
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ld8 r33 = [r12], 8 // recover fn
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;;
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ld8 r32 = [r12], 8 // recover arg
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cmp.eq p6,p0=-1,r10
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(p6) br.cond.spnt.many __syscall_error // handle error
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cmp.ne p7,p0=0,r8
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(p7) ret // parent process, just return
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cmp.eq p8,p0=0,r33
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(p8) ret // fork call, return
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alloc loc0 = ar.pfs,2,2,2,0
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;;
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ld8 r2 = [in1], 8 // get address of fn
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mov out0 = in0
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mov loc1 = gp // save gp across indirect call
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;;
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ld8 gp = [in1] // set new gp
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mov b6 = r2
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br.call.sptk b0 = b6 // call thread routine
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;;
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mov ar.pfs = loc0
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mov gp = loc1
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mov r32 = r8 // exit value
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br.call.sptk b0 = _exit // we're out of here
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PSEUDO_END(__clone)
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weak_alias (__clone, clone)
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