1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* Target-dependent code for HP PA-RISC BSD's.
Copyright (C) 2004-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "objfiles.h"
#include "target.h"
#include "value.h"
#include "elf/common.h"
#include "hppa-tdep.h"
#include "hppabsd-tdep.h"
#include "dwarf2-frame.h"
#include "solib-svr4.h"
static CORE_ADDR
hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR faddr = value_as_address (function);
struct obj_section *faddr_sec;
gdb_byte buf[4];
/* Is this a plabel? If so, dereference it to get the Global Pointer
value. */
if (faddr & 2)
{
if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0)
return extract_unsigned_integer (buf, sizeof buf, byte_order);
}
/* If the address is in the .plt section, then the real function
hasn't yet been fixed up by the linker so we cannot determine the
Global Pointer for that function. */
if (in_plt_section (faddr))
return 0;
faddr_sec = find_pc_section (faddr);
if (faddr_sec != NULL)
{
struct obj_section *sec;
ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec)
{
if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0)
break;
}
if (sec < faddr_sec->objfile->sections_end)
{
CORE_ADDR addr = obj_section_addr (sec);
CORE_ADDR endaddr = obj_section_endaddr (sec);
while (addr < endaddr)
{
gdb_byte buf[4];
LONGEST tag;
if (target_read_memory (addr, buf, sizeof buf) != 0)
break;
tag = extract_signed_integer (buf, sizeof buf, byte_order);
if (tag == DT_PLTGOT)
{
CORE_ADDR pltgot;
if (target_read_memory (addr + 4, buf, sizeof buf) != 0)
break;
/* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so
we have to do it ourselves. */
pltgot = extract_unsigned_integer (buf, sizeof buf,
byte_order);
pltgot += ANOFFSET (sec->objfile->section_offsets,
SECT_OFF_TEXT (sec->objfile));
return pltgot;
}
if (tag == DT_NULL)
break;
addr += 8;
}
}
}
return 0;
}
static void
hppabsd_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
struct dwarf2_frame_state_reg *reg,
struct frame_info *this_frame)
{
if (regnum == HPPA_PCOQ_HEAD_REGNUM)
reg->how = DWARF2_FRAME_REG_RA;
else if (regnum == HPPA_SP_REGNUM)
reg->how = DWARF2_FRAME_REG_CFA;
}
void
hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* OpenBSD and NetBSD have a 64-bit 'long double'. */
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
/* OpenBSD and NetBSD use ELF. */
tdep->is_elf = 1;
tdep->find_global_pointer = hppabsd_find_global_pointer;
tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
/* OpenBSD and NetBSD use SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* Hook in the DWARF CFI frame unwinder. */
dwarf2_frame_set_init_reg (gdbarch, hppabsd_dwarf2_frame_init_reg);
dwarf2_append_unwinders (gdbarch);
}
|
