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/tmp/gdb-8.1/gdb/tilegx-linux-nat.c
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1 /* Native-dependent code for GNU/Linux TILE-Gx.
2
3 Copyright (C) 2012-2018 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 "inferior.h"
22 #include "gdbcore.h"
23 #include "regcache.h"
24 #include "linux-nat.h"
25 #include "inf-ptrace.h"
26
27 #include "nat/gdb_ptrace.h"
28
29 #include <sys/procfs.h>
30
31 /* Defines ps_err_e, struct ps_prochandle. */
32 #include "gdb_proc_service.h"
33
34 /* Prototypes for supply_gregset etc. */
35 #include "gregset.h"
36
37 /* The register sets used in GNU/Linux ELF core-dumps are identical to
38 the register sets in `struct user' that is used for a.out
39 core-dumps, and is also used by `ptrace'. The corresponding types
40 are `elf_gregset_t' for the general-purpose registers (with
41 `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
42 for the floating-point registers.
43
44 Those types used to be available under the names `gregset_t' and
45 `fpregset_t' too, and this file used those names in the past. But
46 those names are now used for the register sets used in the
47 `mcontext_t' type, and have a different size and layout. */
48
49 /* Mapping between the general-purpose registers in `struct user'
50 format and GDB's register array layout. Note that we map the
51 first 56 registers (0 thru 55) one-to-one. GDB maps the pc to
52 slot 64, but ptrace returns it in slot 56. */
53 static const int regmap[] =
54 {
55 0, 1, 2, 3, 4, 5, 6, 7,
56 8, 9, 10, 11, 12, 13, 14, 15,
57 16, 17, 18, 19, 20, 21, 22, 23,
58 24, 25, 26, 27, 28, 29, 30, 31,
59 32, 33, 34, 35, 36, 37, 38, 39,
60 40, 41, 42, 43, 44, 45, 46, 47,
61 48, 49, 50, 51, 52, 53, 54, 55,
62 -1, -1, -1, -1, -1, -1, -1, -1,
63 56, 58
64 };
65
66 /* Transfering the general-purpose registers between GDB, inferiors
67 and core files. */
68
69 /* Fill GDB's register array with the general-purpose register values
70 in *GREGSETP. */
71
72 void
73 supply_gregset (struct regcache* regcache,
74 const elf_gregset_t *gregsetp)
75 {
76 elf_greg_t *regp = (elf_greg_t *) gregsetp;
77 int i;
78
79 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
80 if (regmap[i] >= 0)
81 regcache_raw_supply (regcache, i, regp + regmap[i]);
82 }
83
84 /* Fill registers in *GREGSETPS with the values in GDB's
85 register array. */
86
87 void
88 fill_gregset (const struct regcache* regcache,
89 elf_gregset_t *gregsetp, int regno)
90 {
91 elf_greg_t *regp = (elf_greg_t *) gregsetp;
92 int i;
93
94 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
95 if (regmap[i] >= 0)
96 regcache_raw_collect (regcache, i, regp + regmap[i]);
97 }
98
99 /* Transfering floating-point registers between GDB, inferiors and cores. */
100
101 /* Fill GDB's register array with the floating-point register values in
102 *FPREGSETP. */
103
104 void
105 supply_fpregset (struct regcache *regcache,
106 const elf_fpregset_t *fpregsetp)
107 {
108 /* NOTE: There are no floating-point registers for TILE-Gx. */
109 }
110
111 /* Fill register REGNO (if it is a floating-point register) in
112 *FPREGSETP with the value in GDB's register array. If REGNO is -1,
113 do this for all registers. */
114
115 void
116 fill_fpregset (const struct regcache *regcache,
117 elf_fpregset_t *fpregsetp, int regno)
118 {
119 /* NOTE: There are no floating-point registers for TILE-Gx. */
120 }
121
122 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
123 for all registers. */
124
125 static void
126 fetch_inferior_registers (struct target_ops *ops,
127 struct regcache *regcache, int regnum)
128 {
129 elf_gregset_t regs;
130 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
131
132 if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
133 perror_with_name (_("Couldn't get registers"));
134
135 supply_gregset (regcache, (const elf_gregset_t *)&regs);
136 }
137
138 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
139 this for all registers. */
140
141 static void
142 store_inferior_registers (struct target_ops *ops,
143 struct regcache *regcache, int regnum)
144 {
145 elf_gregset_t regs;
146 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
147
148 if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
149 perror_with_name (_("Couldn't get registers"));
150
151 fill_gregset (regcache, &regs, regnum);
152
153 if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
154 perror_with_name (_("Couldn't write registers"));
155 }
156
157 void
158 _initialize_tile_linux_nat (void)
159 {
160 struct target_ops *t;
161
162 /* Fill in the generic GNU/Linux methods. */
163 t = linux_target ();
164
165 /* Add our register access methods. */
166 t->to_fetch_registers = fetch_inferior_registers;
167 t->to_store_registers = store_inferior_registers;
168
169 /* Register the target. */
170 linux_nat_add_target (t);
171 }
selftests::ptid::tid
static constexpr ptid_t tid
Definition: ptid-selftests.c:43
fill_fpregset
void fill_fpregset(const struct regcache *regcache, elf_fpregset_t *fpregsetp, int regno)
Definition: tilegx-linux-nat.c:116
regcache_get_ptid
ptid_t regcache_get_ptid(const struct regcache *regcache)
Definition: regcache.c:229
_initialize_tile_linux_nat
void _initialize_tile_linux_nat(void)
Definition: tilegx-linux-nat.c:158
_
#define _(String)
Definition: gdb_locale.h:35
fill_gregset
void fill_gregset(const struct regcache *regcache, elf_gregset_t *gregsetp, int regno)
Definition: tilegx-linux-nat.c:88
defs.h
gdb_proc_service.h
ptrace
PTRACE_TYPE_RET ptrace()
inf-ptrace.h
supply_gregset
void supply_gregset(struct regcache *regcache, const elf_gregset_t *gregsetp)
Definition: tilegx-linux-nat.c:73
target_ops
Definition: target.h:412
regcache.h
inferior.h
supply_fpregset
void supply_fpregset(struct regcache *regcache, const elf_fpregset_t *fpregsetp)
Definition: tilegx-linux-nat.c:105
linux_nat_add_target
void linux_nat_add_target(struct target_ops *t)
Definition: linux-nat.c:4804
regnum
int regnum
Definition: aarch64-tdep.c:77
linux_target
struct target_ops * linux_target(void)
Definition: linux-nat.c:4377
gregset.h
regmap
static const int regmap[]
Definition: tilegx-linux-nat.c:53
target_ops::to_fetch_registers
void(* to_fetch_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:457
perror_with_name
void void void void void void void void void perror_with_name(const char *string) ATTRIBUTE_NORETURN
Definition: utils.c:692
fetch_inferior_registers
static void fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: tilegx-linux-nat.c:126
gdbcore.h
store_inferior_registers
static void store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: tilegx-linux-nat.c:142
PTRACE_SETREGS
#define PTRACE_SETREGS
Definition: ppc-linux-nat.c:139
regcache_raw_supply
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1004
regcache
Definition: regcache.h:232
gdb_ptrace.h
regcache_raw_collect
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1085
PTRACE_TYPE_ARG3
#define PTRACE_TYPE_ARG3
Definition: config.h:642
get_ptrace_pid
pid_t get_ptrace_pid(ptid_t ptid)
Definition: inf-ptrace.c:320
target_ops::to_store_registers
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:459
PTRACE_GETREGS
#define PTRACE_GETREGS
Definition: ppc-linux-nat.c:136
linux-nat.h