1 /* Target-dependent code for HP PA-RISC BSD's. 2 3 Copyright (C) 2004-2024 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 #include "extract-store-integer.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 for (struct obj_section *sec : faddr_sec->objfile->sections ()) 58 { 59 if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0) 60 { 61 CORE_ADDR addr = sec->addr (); 62 CORE_ADDR endaddr = sec->endaddr (); 63 64 while (addr < endaddr) 65 { 66 gdb_byte buf[4]; 67 LONGEST tag; 68 69 if (target_read_memory (addr, buf, sizeof buf) != 0) 70 break; 71 72 tag = extract_signed_integer (buf, byte_order); 73 if (tag == DT_PLTGOT) 74 { 75 CORE_ADDR pltgot; 76 77 if (target_read_memory (addr + 4, buf, sizeof buf) != 0) 78 break; 79 80 /* The NetBSD/OpenBSD ld.so doesn't relocate 81 DT_PLTGOT, so we have to do it ourselves. */ 82 pltgot = extract_unsigned_integer (buf, sizeof buf, 83 byte_order); 84 pltgot += sec->objfile->text_section_offset (); 85 86 return pltgot; 87 } 88 89 if (tag == DT_NULL) 90 break; 91 92 addr += 8; 93 } 94 95 break; 96 } 97 } 98 } 99 100 return 0; 101 } 102 103 104 static void 105 hppabsd_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, 106 struct dwarf2_frame_state_reg *reg, 107 const frame_info_ptr &this_frame) 108 { 109 if (regnum == HPPA_PCOQ_HEAD_REGNUM) 110 reg->how = DWARF2_FRAME_REG_RA; 111 else if (regnum == HPPA_SP_REGNUM) 112 reg->how = DWARF2_FRAME_REG_CFA; 113 } 114 115 void 116 hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 117 { 118 hppa_gdbarch_tdep *tdep = gdbarch_tdep<hppa_gdbarch_tdep> (gdbarch); 119 120 /* OpenBSD and NetBSD have a 64-bit 'long double'. */ 121 set_gdbarch_long_double_bit (gdbarch, 64); 122 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); 123 124 /* OpenBSD and NetBSD use ELF. */ 125 tdep->is_elf = 1; 126 tdep->find_global_pointer = hppabsd_find_global_pointer; 127 tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline; 128 set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code); 129 130 /* OpenBSD and NetBSD use SVR4-style shared libraries. */ 131 set_solib_svr4_fetch_link_map_offsets 132 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 133 134 /* Hook in the DWARF CFI frame unwinder. */ 135 dwarf2_frame_set_init_reg (gdbarch, hppabsd_dwarf2_frame_init_reg); 136 dwarf2_append_unwinders (gdbarch); 137 } 138