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hppa-bsd-tdep.c
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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
32static CORE_ADDR
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
107static void
109 struct dwarf2_frame_state_reg *reg,
110 frame_info_ptr this_frame)
111{
114 else if (regnum == HPPA_SP_REGNUM)
116}
117
118void
120{
121 hppa_gdbarch_tdep *tdep = gdbarch_tdep<hppa_gdbarch_tdep> (gdbarch);
122
123 /* OpenBSD and NetBSD have a 64-bit 'long double'. */
126
127 /* OpenBSD and NetBSD use ELF. */
128 tdep->is_elf = 1;
132
133 /* OpenBSD and NetBSD use SVR4-style shared libraries. */
136
137 /* Hook in the DWARF CFI frame unwinder. */
140}
int regnum
static LONGEST extract_signed_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition defs.h:511
static ULONGEST extract_unsigned_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition defs.h:526
void dwarf2_append_unwinders(struct gdbarch *gdbarch)
Definition frame.c:1361
void dwarf2_frame_set_init_reg(struct gdbarch *gdbarch, void(*init_reg)(struct gdbarch *, int, struct dwarf2_frame_state_reg *, frame_info_ptr))
Definition frame.c:659
@ DWARF2_FRAME_REG_RA
Definition frame.h:61
@ DWARF2_FRAME_REG_CFA
Definition frame.h:63
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition gdbarch.c:1370
void set_gdbarch_skip_trampoline_code(struct gdbarch *gdbarch, gdbarch_skip_trampoline_code_ftype *skip_trampoline_code)
void set_gdbarch_long_double_format(struct gdbarch *gdbarch, const struct floatformat **long_double_format)
Definition gdbarch.c:1632
void set_gdbarch_long_double_bit(struct gdbarch *gdbarch, int long_double_bit)
Definition gdbarch.c:1616
const struct floatformat * floatformats_ieee_double[BFD_ENDIAN_UNKNOWN]
Definition gdbtypes.c:87
void hppabsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
static CORE_ADDR hppabsd_find_global_pointer(struct gdbarch *gdbarch, struct value *function)
static void hppabsd_dwarf2_frame_init_reg(struct gdbarch *gdbarch, int regnum, struct dwarf2_frame_state_reg *reg, frame_info_ptr this_frame)
CORE_ADDR hppa_skip_trampoline_code(frame_info_ptr frame, CORE_ADDR pc)
Definition hppa-tdep.c:2888
int hppa_in_solib_call_trampoline(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition hppa-tdep.c:2860
@ HPPA_SP_REGNUM
Definition hppa-tdep.h:42
@ HPPA_PCOQ_HEAD_REGNUM
Definition hppa-tdep.h:46
struct obj_section * find_pc_section(CORE_ADDR pc)
Definition objfiles.c:1170
#define ALL_OBJFILE_OSECTIONS(objfile, osect)
Definition objfiles.h:130
static int in_plt_section(CORE_ADDR pc)
Definition objfiles.h:901
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
struct link_map_offsets * svr4_ilp32_fetch_link_map_offsets(void)
enum dwarf2_frame_reg_rule how
Definition frame.h:86
CORE_ADDR(* find_global_pointer)(struct gdbarch *, struct value *)
Definition hppa-tdep.h:99
int(* in_solib_call_trampoline)(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition hppa-tdep.h:104
CORE_ADDR addr() const
Definition objfiles.h:822
CORE_ADDR endaddr() const
Definition objfiles.h:829
struct objfile * objfile
Definition objfiles.h:838
struct bfd_section * the_bfd_section
Definition objfiles.h:835
struct obj_section * sections_end
Definition objfiles.h:726
CORE_ADDR text_section_offset() const
Definition objfiles.h:457
Definition value.c:181
int target_read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition target.c:1771
CORE_ADDR value_as_address(struct value *val)
Definition value.c:2804