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3b2dcfb789
This commit adds, to solib-svr4.h and solib-svr4.c, functions glibc_link_map_to_tls_module_id and musl_link_map_to_tls_module_id for use with callers in a new file svr4-tls-tdep.c (which is not in this commit). It adds a number of helper functions for implementing link map to module id support. It also renames existing function 'find_program_interpreter' to 'svr4_find_program_interpreter' and makes it visible to other source files within GDB. It will be used in the libc sniffing code in svr4-tls-tdep.c in a later commit in this series. The libc sniffer is needed in order to know which link map to module id function to call as the method for determining module ids differs between libc / dynamic linker implementations. These details are discussed in comments in the patch. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24548 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31563 Tested-By: Luis Machado <luis.machado@arm.com> Approved-By: Luis Machado <luis.machado@arm.com>
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/* Handle shared libraries for GDB, the GNU Debugger.
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Copyright (C) 2000-2025 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 GDB_SOLIB_SVR4_H
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#define GDB_SOLIB_SVR4_H
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#include "solist.h"
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struct objfile;
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struct solib_ops;
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extern const solib_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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/* For the MUSL C library, given link map address LM_ADDR, return the
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corresponding TLS module id, or 0 if not found. */
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int musl_link_map_to_tls_module_id (CORE_ADDR lm_addr);
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/* For GLIBC, given link map address LM_ADDR, return the corresponding TLS
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module id, or 0 if not found. */
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int glibc_link_map_to_tls_module_id (CORE_ADDR lm_addr);
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/* Return program interpreter string. */
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std::optional<gdb::byte_vector> svr4_find_program_interpreter ();
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#endif /* GDB_SOLIB_SVR4_H */
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