1 /* Handle shared libraries for GDB, the GNU Debugger. 2 3 Copyright (C) 2000-2024 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #ifndef SOLIB_SVR4_H 21 #define SOLIB_SVR4_H 22 23 #include "solist.h" 24 25 struct objfile; 26 struct solib_ops; 27 28 extern const solib_ops svr4_so_ops; 29 30 /* Link map info to include in an allocated so_list entry. */ 31 32 struct lm_info_svr4 final : public lm_info 33 { 34 /* Amount by which addresses in the binary should be relocated to 35 match the inferior. The direct inferior value is L_ADDR_INFERIOR. 36 When prelinking is involved and the prelink base address changes, 37 we may need a different offset - the recomputed offset is in L_ADDR. 38 It is commonly the same value. It is cached as we want to warn about 39 the difference and compute it only once. L_ADDR is valid 40 iff L_ADDR_P. */ 41 CORE_ADDR l_addr = 0, l_addr_inferior = 0; 42 bool l_addr_p = false; 43 44 /* The target location of lm. */ 45 CORE_ADDR lm_addr = 0; 46 47 /* Values read in from inferior's fields of the same name. */ 48 CORE_ADDR l_ld = 0, l_next = 0, l_prev = 0, l_name = 0; 49 }; 50 51 using lm_info_svr4_up = std::unique_ptr<lm_info_svr4>; 52 53 /* Critical offsets and sizes which describe struct r_debug and 54 struct link_map on SVR4-like targets. All offsets and sizes are 55 in bytes unless otherwise specified. */ 56 57 struct link_map_offsets 58 { 59 /* Offset and size of r_debug.r_version. */ 60 int r_version_offset, r_version_size; 61 62 /* Offset of r_debug.r_map. */ 63 int r_map_offset; 64 65 /* Offset of r_debug.r_brk. */ 66 int r_brk_offset; 67 68 /* Offset of r_debug.r_ldsomap. */ 69 int r_ldsomap_offset; 70 71 /* Offset of r_debug_extended.r_next. */ 72 int r_next_offset; 73 74 /* Size of struct link_map (or equivalent), or at least enough of it 75 to be able to obtain the fields below. */ 76 int link_map_size; 77 78 /* Offset to l_addr field in struct link_map. */ 79 int l_addr_offset; 80 81 /* Offset to l_ld field in struct link_map. */ 82 int l_ld_offset; 83 84 /* Offset to l_next field in struct link_map. */ 85 int l_next_offset; 86 87 /* Offset to l_prev field in struct link_map. */ 88 int l_prev_offset; 89 90 /* Offset to l_name field in struct link_map. */ 91 int l_name_offset; 92 }; 93 94 /* set_solib_svr4_fetch_link_map_offsets() is intended to be called by 95 a <arch>_gdbarch_init() function. It is used to establish an 96 architecture specific link_map_offsets fetcher for the architecture 97 being defined. */ 98 99 extern void set_solib_svr4_fetch_link_map_offsets 100 (struct gdbarch *gdbarch, struct link_map_offsets *(*func) (void)); 101 102 /* This function is called by thread_db.c. Return the address of the 103 link map for the given objfile. */ 104 extern CORE_ADDR svr4_fetch_objfile_link_map (struct objfile *objfile); 105 106 /* Fetch (and possibly build) an appropriate `struct link_map_offsets' 107 for ILP32 and LP64 SVR4 systems. */ 108 extern struct link_map_offsets *svr4_ilp32_fetch_link_map_offsets (void); 109 extern struct link_map_offsets *svr4_lp64_fetch_link_map_offsets (void); 110 111 /* Return 1 if PC lies in the dynamic symbol resolution code of the 112 SVR4 run time loader. */ 113 int svr4_in_dynsym_resolve_code (CORE_ADDR pc); 114 115 #endif /* solib-svr4.h */ 116