1 /* Target-dependent code for HP PA-RISC BSD's. 2 3 Copyright (C) 2004-2023 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 #include "defs.h" 21 #include "objfiles.h" 22 #include "target.h" 23 #include "value.h" 24 25 #include "elf/common.h" 26 27 #include "hppa-tdep.h" 28 #include "hppa-bsd-tdep.h" 29 #include "dwarf2/frame.h" 30 #include "solib-svr4.h" 31 32 static CORE_ADDR 33 hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function) 34 { 35 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 36 CORE_ADDR faddr = value_as_address (function); 37 struct obj_section *faddr_sec; 38 39 /* Is this a plabel? If so, dereference it to get the Global Pointer 40 value. */ 41 if (faddr & 2) 42 { 43 gdb_byte buf[4]; 44 if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0) 45 return extract_unsigned_integer (buf, sizeof buf, byte_order); 46 } 47 48 /* If the address is in the .plt section, then the real function 49 hasn't yet been fixed up by the linker so we cannot determine the 50 Global Pointer for that function. */ 51 if (in_plt_section (faddr)) 52 return 0; 53 54 faddr_sec = find_pc_section (faddr); 55 if (faddr_sec != NULL) 56 { 57 struct obj_section *sec; 58 59 ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec) 60 { 61 if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0) 62 break; 63 } 64 65 if (sec < faddr_sec->objfile->sections_end) 66 { 67 CORE_ADDR addr = sec->addr (); 68 CORE_ADDR endaddr = sec->endaddr (); 69 70 while (addr < endaddr) 71 { 72 gdb_byte buf[4]; 73 LONGEST tag; 74 75 if (target_read_memory (addr, buf, sizeof buf) != 0) 76 break; 77 78 tag = extract_signed_integer (buf, byte_order); 79 if (tag == DT_PLTGOT) 80 { 81 CORE_ADDR pltgot; 82 83 if (target_read_memory (addr + 4, buf, sizeof buf) != 0) 84 break; 85 86 /* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so 87 we have to do it ourselves. */ 88 pltgot = extract_unsigned_integer (buf, sizeof buf, 89 byte_order); 90 pltgot += sec->objfile->text_section_offset (); 91 92 return pltgot; 93 } 94 95 if (tag == DT_NULL) 96 break; 97 98 addr += 8; 99 } 100 } 101 } 102 103 return 0; 104 } 105 106 107 static void 108 hppabsd_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, 109 struct dwarf2_frame_state_reg *reg, 110 frame_info_ptr this_frame) 111 { 112 if (regnum == HPPA_PCOQ_HEAD_REGNUM) 113 reg->how = DWARF2_FRAME_REG_RA; 114 else if (regnum == HPPA_SP_REGNUM) 115 reg->how = DWARF2_FRAME_REG_CFA; 116 } 117 118 void 119 hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 120 { 121 hppa_gdbarch_tdep *tdep = gdbarch_tdep<hppa_gdbarch_tdep> (gdbarch); 122 123 /* OpenBSD and NetBSD have a 64-bit 'long double'. */ 124 set_gdbarch_long_double_bit (gdbarch, 64); 125 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); 126 127 /* OpenBSD and NetBSD use ELF. */ 128 tdep->is_elf = 1; 129 tdep->find_global_pointer = hppabsd_find_global_pointer; 130 tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline; 131 set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code); 132 133 /* OpenBSD and NetBSD use SVR4-style shared libraries. */ 134 set_solib_svr4_fetch_link_map_offsets 135 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 136 137 /* Hook in the DWARF CFI frame unwinder. */ 138 dwarf2_frame_set_init_reg (gdbarch, hppabsd_dwarf2_frame_init_reg); 139 dwarf2_append_unwinders (gdbarch); 140 } 141