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96bb3873ec
A subsequent patch makes use of non-trivial types in struct so_list.
This trips on the fact that svr4_copy_library_list uses memcpy to copy
so_list objects:
so_list *newobj = new so_list;
memcpy (newobj, src, sizeof (struct so_list));
solib-svr4 maintains lists of so_list objects in its own internal data
structures. When requested to return a list of so_list objects (through
target_so_ops::current_sos), it duplicates the internal so_list lists,
using memcpy. When changing so_list to make it non-trivial, we would
need to replace this use of memcpy somehow. That would mean making
so_list copyable, with all the complexity that entails, just to satisfy
this internal usage of solib-svr4 (and solib-rocm, which does the same).
Change solib-svr4 to use its own data type for its internal lists. The
use of so_list is a bit overkill anyway, as most fields of so_list are
irrelevant for this internal use.
- Introduce svr4_so, which contains just an std::string for the name
and a unique_ptr for the lm_info.
- Change the internal so_list lists to be std::vector<svr4_so>. Vector
seems like a good choice for this, we don't need to insert/remove
elements in the middle of these internal lists.
- Remove svr4_free_library_list, free_solib_lists and ~svr4_info, as
everything is managed automatically now.
- Replace svr4_copy_library_list (which duplicated internal lists in
order to return them to the core) with so_list_from_svr4_sos, which
creates an so_list list from a vector of svr4_so.
- Generalize svr4_same a bit, because find_debug_base_for_solib now
needs to compare an so_list and an svr4_so to see if they are the
same.
Change-Id: I6012e48e07aace2a8172b74b389f9547ce777877
Approved-By: Pedro Alves <pedro@palves.net>
Reviewed-By: Reviewed-By: Lancelot Six <lancelot.six@amd.com>
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
/* Handle shared libraries for GDB, the GNU Debugger.
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Copyright (C) 2000-2023 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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#ifndef SOLIB_SVR4_H
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#define SOLIB_SVR4_H
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#include "solist.h"
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struct objfile;
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struct target_so_ops;
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extern const struct target_so_ops svr4_so_ops;
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/* Link map info to include in an allocated so_list entry. */
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struct lm_info_svr4 final : public lm_info
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{
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/* Amount by which addresses in the binary should be relocated to
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match the inferior. The direct inferior value is L_ADDR_INFERIOR.
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When prelinking is involved and the prelink base address changes,
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we may need a different offset - the recomputed offset is in L_ADDR.
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It is commonly the same value. It is cached as we want to warn about
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the difference and compute it only once. L_ADDR is valid
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iff L_ADDR_P. */
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CORE_ADDR l_addr = 0, l_addr_inferior = 0;
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bool l_addr_p = false;
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/* The target location of lm. */
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CORE_ADDR lm_addr = 0;
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/* Values read in from inferior's fields of the same name. */
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CORE_ADDR l_ld = 0, l_next = 0, l_prev = 0, l_name = 0;
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};
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using lm_info_svr4_up = std::unique_ptr<lm_info_svr4>;
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/* Critical offsets and sizes which describe struct r_debug and
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struct link_map on SVR4-like targets. All offsets and sizes are
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in bytes unless otherwise specified. */
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struct link_map_offsets
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{
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/* Offset and size of r_debug.r_version. */
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int r_version_offset, r_version_size;
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/* Offset of r_debug.r_map. */
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int r_map_offset;
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/* Offset of r_debug.r_brk. */
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int r_brk_offset;
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/* Offset of r_debug.r_ldsomap. */
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int r_ldsomap_offset;
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/* Offset of r_debug_extended.r_next. */
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int r_next_offset;
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/* Size of struct link_map (or equivalent), or at least enough of it
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to be able to obtain the fields below. */
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int link_map_size;
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/* Offset to l_addr field in struct link_map. */
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int l_addr_offset;
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/* Offset to l_ld field in struct link_map. */
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int l_ld_offset;
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/* Offset to l_next field in struct link_map. */
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int l_next_offset;
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/* Offset to l_prev field in struct link_map. */
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int l_prev_offset;
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/* Offset to l_name field in struct link_map. */
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int l_name_offset;
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};
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/* set_solib_svr4_fetch_link_map_offsets() is intended to be called by
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a <arch>_gdbarch_init() function. It is used to establish an
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architecture specific link_map_offsets fetcher for the architecture
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being defined. */
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extern void set_solib_svr4_fetch_link_map_offsets
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(struct gdbarch *gdbarch, struct link_map_offsets *(*func) (void));
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/* This function is called by thread_db.c. Return the address of the
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link map for the given objfile. */
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extern CORE_ADDR svr4_fetch_objfile_link_map (struct objfile *objfile);
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/* Fetch (and possibly build) an appropriate `struct link_map_offsets'
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for ILP32 and LP64 SVR4 systems. */
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extern struct link_map_offsets *svr4_ilp32_fetch_link_map_offsets (void);
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extern struct link_map_offsets *svr4_lp64_fetch_link_map_offsets (void);
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/* Return 1 if PC lies in the dynamic symbol resolution code of the
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SVR4 run time loader. */
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int svr4_in_dynsym_resolve_code (CORE_ADDR pc);
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#endif /* solib-svr4.h */
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