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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, see
- <http://www.gnu.org/licenses/>. */
- /* 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. */
- [--SP] = RETS;
- [--SP] = P0;
- [--SP] = R0;
- [--SP] = R1;
- [--SP] = R2;
- sp += -12;
- /* Prepare to call _dl_linux_resolver. */
- R0 = [P3 + 8];
- /* Not aligned for space reasons. */
- R1 = W[P1 + -4] (Z);
- P1 += -2;
- R1.H = W[P1];
- P3 = R3;
- CALL __dl_linux_resolver;
- /* Move aside return value that contains the FUNCDESC_VALUE. */
- P3 = R0;
- P1 = [P3];
- P3 = [P3 + 4];
- /* Restore arguments. */
- sp += 12;
- R2 = [SP++];
- R1 = [SP++];
- R0 = [SP++];
- P0 = [SP++];
- RETS = [SP++];
- /* Now jump to the actual function. */
- JUMP (P1);
- .size __dl_linux_resolve, . - __dl_linux_resolve
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