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- /* Copyright (C) 2003 Red Hat, Inc.
- Contributed by Alexandre Oliva <aoliva@redhat.com>
- This file is part of uClibc.
- uClibc 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.
- uClibc 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
- Library General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with uClibc; see the file COPYING.LIB. If not, write to
- the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
- USA. */
- /* The function below is tail-called by resolver stubs when a
- lazily-bound function is called. It must preserve all
- registers that could be used to pass arguments to the actual
- function. Upon _dl_linux_resolve entry, GR14 holds the
- address of a lazy PLT entry, so @(GR14,-4) is the lazy
- relocation number that we have to pass to _dl_linux_resolver.
- GR15 holds the caller's GOT, from which we extract the
- elf_resolve* that _dl_linux_resolver needs as well.
- _dl_linux_resolver() figures out where the jump symbol is
- _really_ supposed to have jumped to and returns that to us.
- Once we have that, we prepare to tail-call the actual
- function, clean up after ourselves, restoring the original
- arguments, then jump to the fixed up address. */
- .text
- .p2align 4
- .hidden _dl_linux_resolve
- .global _dl_linux_resolve
- .type _dl_linux_resolve,@function
- _dl_linux_resolve:
- /* Preserve arguments. */
- addi sp, -8*4, sp
- stdi gr8, @(sp, 8)
- stdi gr10, @(sp, 16)
- stdi gr12, @(sp, 24)
- movsg lr,gr8
- st gr8, @(sp,gr0)
- /* Prepare to call _dl_linux_resolver. */
- ldi @(gr15, 8), gr8
- ldi @(gr14, -4), gr9
- mov.p gr5, gr15
- call _dl_linux_resolver
- /* Move aside return value that contains the FUNCDESC_VALUE. */
- ldd @(gr8,gr0),gr14
- /* Restore arguments. */
- ld @(sp, gr0), gr8
- movgs gr8,lr
- lddi @(sp, 24), gr12
- lddi @(sp, 16), gr10
- lddi @(sp, 8), gr8
- addi sp, 8*4, sp
- /* Now jump to the actual function. */
- jmpl @(gr14, gr0)
- .size _dl_linux_resolve, . - _dl_linux_resolve
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