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122 lines
2.9 KiB
ArmAsm
122 lines
2.9 KiB
ArmAsm
/* Copyright (C) 1997, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@tamu.edu).
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 <asm/errno.h>
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#include <asm/unistd.h>
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#include <tcb-offsets.h>
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#include <sysdep.h>
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#define CLONE_VM 0x00000100
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#define CLONE_THREAD 0x00010000
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *ptid, void *tls, pid_t *ctid); */
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.register %g2,#scratch
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.register %g3,#scratch
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.text
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ENTRY (__clone)
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save %sp, -192, %sp
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cfi_def_cfa_register(%fp)
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cfi_window_save
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cfi_register(%o7, %i7)
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/* sanity check arguments */
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brz,pn %i0, 99f /* fn non-NULL? */
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mov %i0, %g2
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brz,pn %i1, 99f /* child_stack non-NULL? */
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mov %i2, %o0 /* clone flags */
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/* The child_stack is the top of the stack, allocate one
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whole stack frame from that as this is what the kernel
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expects. Also, subtract STACK_BIAS. */
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sub %i1, 192 + 0x7ff, %o1
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mov %i3, %g3
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mov %i2, %g4
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mov %i4,%o2 /* PTID */
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mov %i5,%o3 /* TLS */
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ldx [%fp+0x7ff+176],%o4 /* CTID */
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/* Do the system call */
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set __NR_clone, %g1
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ta 0x6d
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bcs,pn %xcc, 99f
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nop
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brnz,pn %o1, __thread_start
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nop
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jmpl %i7 + 8, %g0
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restore %o0, %g0, %o0
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99:
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#ifndef _LIBC_REENTRANT
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#ifdef PIC
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call 1f
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sethi %hi(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
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1: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
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add %l7, %o7, %l7
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set EINVAL, %i0
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sethi %hi(errno), %g2
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or %g2, %lo(errno), %g2
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st %i0, [%l7+%g2]
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#else
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sethi %hi(errno), %g2
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set EINVAL, %i0
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st %i0, [%g2+%lo(errno)]
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#endif
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#else
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call __errno_location
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nop
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st %i0, [%o0]
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#endif
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jmpl %i7 + 8, %g0
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restore %g0,-1,%o0
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END(__clone)
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.type __thread_start,@function
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__thread_start:
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cfi_startproc
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#ifdef RESET_PID
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sethi %hi(CLONE_THREAD), %l0
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andcc %g4, %l0, %g0
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bne,pt %icc, 1f
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andcc %g4, CLONE_VM, %g0
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bne,a,pn %icc, 2f
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mov -1,%o0
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set __NR_getpid,%g1
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ta 0x6d
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2: st %o0,[%g7 + PID]
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st %o0,[%g7 + TID]
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1:
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#endif
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mov %g0, %fp /* terminate backtrace */
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call %g2
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mov %g3,%o0
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call _exit,0
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nop
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cfi_endproc
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.size __thread_start, .-__thread_start
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weak_alias (__clone, clone)
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