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alpha-obsd-tdep.c
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1/* Target-dependent code for OpenBSD/alpha.
2
3 Copyright (C) 2006-2023 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 "frame.h"
22#include "gdbcore.h"
23#include "osabi.h"
24
25#include "obsd-tdep.h"
26#include "alpha-tdep.h"
27#include "alpha-bsd-tdep.h"
28#include "solib-svr4.h"
29
30/* Signal trampolines. */
31
32/* The OpenBSD kernel maps the signal trampoline at some random
33 location in user space, which means that the traditional BSD way of
34 detecting it won't work.
35
36 The signal trampoline will be mapped at an address that is page
37 aligned. We recognize the signal trampoline by looking for the
38 sigreturn system call. */
39
40static const int alphaobsd_page_size = 8192;
41
42static LONGEST
44{
45 return (pc & (alphaobsd_page_size - 1));
46}
47
48static int
50 CORE_ADDR pc, const char *name)
51{
52 CORE_ADDR start_pc = (pc & ~(alphaobsd_page_size - 1));
53 unsigned insn;
54
55 if (name)
56 return 0;
57
58 /* Check for "". */
59 insn = alpha_read_insn (gdbarch, start_pc + 5 * ALPHA_INSN_SIZE);
60 if (insn != 0x201f0067)
61 return 0;
62
63 /* Check for "". */
64 insn = alpha_read_insn (gdbarch, start_pc + 6 * ALPHA_INSN_SIZE);
65 if (insn != 0x00000083)
66 return 0;
67
68 return 1;
69}
70
71static CORE_ADDR
73{
74 struct gdbarch *gdbarch = get_frame_arch (this_frame);
75 CORE_ADDR pc = get_frame_pc (this_frame);
76
78 {
79 /* On entry, a pointer the `struct sigcontext' is passed in %a2. */
80 return get_frame_register_unsigned (this_frame, ALPHA_A0_REGNUM + 2);
81 }
83 {
84 /* It is stored on the stack Before calling the signal handler. */
85 CORE_ADDR sp;
87 return get_frame_memory_unsigned (this_frame, sp, 8);
88 }
89 else
90 {
91 /* It is reloaded into %a0 for the sigreturn(2) call. */
93 }
94}
95
96
97static void
99{
100 alpha_gdbarch_tdep *tdep = gdbarch_tdep<alpha_gdbarch_tdep> (gdbarch);
101
102 /* Hook into the DWARF CFI frame unwinder. */
104
105 /* Hook into the MDEBUG frame unwinder. */
107
108 /* OpenBSD/alpha 3.0 and earlier does not provide single step
109 support via ptrace(2); use software single-stepping for now. */
111
112 /* OpenBSD/alpha has SVR4-style shared libraries. */
116
120
121 tdep->jb_pc = 2;
122 tdep->jb_elt_size = 8;
123
126}
127
128
130void
const char *const name
void alphanbsd_iterate_over_regset_sections(struct gdbarch *gdbarch, iterate_over_regset_sections_cb *cb, void *cb_data, const struct regcache *regcache)
void alpha_mdebug_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
static void alphaobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
void _initialize_alphaobsd_tdep()
static LONGEST alphaobsd_sigtramp_offset(struct gdbarch *gdbarch, CORE_ADDR pc)
static CORE_ADDR alphaobsd_sigcontext_addr(frame_info_ptr this_frame)
static const int alphaobsd_page_size
static int alphaobsd_pc_in_sigtramp(struct gdbarch *gdbarch, CORE_ADDR pc, const char *name)
unsigned int alpha_read_insn(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition alpha-tdep.c:670
void alpha_dwarf2_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
std::vector< CORE_ADDR > alpha_software_single_step(struct regcache *regcache)
#define ALPHA_SP_REGNUM
Definition alpha-tdep.h:47
#define ALPHA_A0_REGNUM
Definition alpha-tdep.h:42
#define ALPHA_INSN_SIZE
Definition alpha-tdep.h:56
ULONGEST get_frame_register_unsigned(frame_info_ptr frame, int regnum)
Definition frame.c:1399
CORE_ADDR get_frame_pc(frame_info_ptr frame)
Definition frame.c:2712
struct gdbarch * get_frame_arch(frame_info_ptr this_frame)
Definition frame.c:3027
ULONGEST get_frame_memory_unsigned(frame_info_ptr this_frame, CORE_ADDR addr, int len)
Definition frame.c:3007
void set_gdbarch_software_single_step(struct gdbarch *gdbarch, gdbarch_software_single_step_ftype *software_single_step)
void set_gdbarch_skip_solib_resolver(struct gdbarch *gdbarch, gdbarch_skip_solib_resolver_ftype *skip_solib_resolver)
void set_gdbarch_iterate_over_regset_sections(struct gdbarch *gdbarch, gdbarch_iterate_over_regset_sections_ftype *iterate_over_regset_sections)
info(Component c)
Definition gdbarch.py:41
CORE_ADDR obsd_skip_solib_resolver(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition obsd-tdep.c:29
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition osabi.c:146
@ GDB_OSABI_OPENBSD
Definition osabi.h:35
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
struct link_map_offsets * svr4_lp64_fetch_link_map_offsets(void)
CORE_ADDR(* sigcontext_addr)(frame_info_ptr)
Definition alpha-tdep.h:84
int(* pc_in_sigtramp)(struct gdbarch *gdbarch, CORE_ADDR pc, const char *name)
Definition alpha-tdep.h:90
LONGEST(* dynamic_sigtramp_offset)(struct gdbarch *, CORE_ADDR)
Definition alpha-tdep.h:80