mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/* Target-dependent code for the GNU C Library (glibc).
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Copyright (C) 2002-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "glibc-tdep.h"
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/* Calling functions in shared libraries. */
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/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
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This function:
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1) decides whether a PLT has sent us into the linker to resolve
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a function reference, and
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2) if so, tells us where to set a temporary breakpoint that will
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trigger when the dynamic linker is done. */
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CORE_ADDR
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glibc_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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/* The GNU dynamic linker is part of the GNU C library, and is used
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by all GNU systems (GNU/Hurd, GNU/Linux). An unresolved PLT
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entry points to "_dl_runtime_resolve", which calls "fixup" to
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patch the PLT, and then passes control to the function.
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We look for the symbol `_dl_runtime_resolve', and find `fixup' in
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the same objfile. If we are at the entry point of `fixup', then
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we set a breakpoint at the return address (at the top of the
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stack), and continue.
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It's kind of gross to do all these checks every time we're
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called, since they don't change once the executable has gotten
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started. But this is only a temporary hack --- upcoming versions
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of GNU/Linux will provide a portable, efficient interface for
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debugging programs that use shared libraries. */
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struct bound_minimal_symbol resolver
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= lookup_bound_minimal_symbol ("_dl_runtime_resolve");
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if (resolver.minsym)
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{
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/* The dynamic linker began using this name in early 2005. */
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struct bound_minimal_symbol fixup
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= lookup_minimal_symbol ("_dl_fixup", NULL, resolver.objfile);
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/* This is the name used in older versions. */
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if (! fixup.minsym)
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fixup = lookup_minimal_symbol ("fixup", NULL, resolver.objfile);
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if (fixup.minsym && fixup.value_address () == pc)
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return frame_unwind_caller_pc (get_current_frame ());
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}
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return 0;
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}
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