Loading...
/* 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 |