GDB (xrefs)
/tmp/gdb-7.10/gdb/tilegx-linux-nat.c
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1 /* Native-dependent code for GNU/Linux TILE-Gx.
2 
3  Copyright (C) 2012-2015 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 
26 #include <sys/ptrace.h>
27 
28 #include <sys/procfs.h>
29 
30 /* Defines ps_err_e, struct ps_prochandle. */
31 #include "gdb_proc_service.h"
32 
33 /* Prototypes for supply_gregset etc. */
34 #include "gregset.h"
35 
36 /* The register sets used in GNU/Linux ELF core-dumps are identical to
37  the register sets in `struct user' that is used for a.out
38  core-dumps, and is also used by `ptrace'. The corresponding types
39  are `elf_gregset_t' for the general-purpose registers (with
40  `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
41  for the floating-point registers.
42 
43  Those types used to be available under the names `gregset_t' and
44  `fpregset_t' too, and this file used those names in the past. But
45  those names are now used for the register sets used in the
46  `mcontext_t' type, and have a different size and layout. */
47 
48 /* Mapping between the general-purpose registers in `struct user'
49  format and GDB's register array layout. Note that we map the
50  first 56 registers (0 thru 55) one-to-one. GDB maps the pc to
51  slot 64, but ptrace returns it in slot 56. */
52 static const int regmap[] =
53 {
54  0, 1, 2, 3, 4, 5, 6, 7,
55  8, 9, 10, 11, 12, 13, 14, 15,
56  16, 17, 18, 19, 20, 21, 22, 23,
57  24, 25, 26, 27, 28, 29, 30, 31,
58  32, 33, 34, 35, 36, 37, 38, 39,
59  40, 41, 42, 43, 44, 45, 46, 47,
60  48, 49, 50, 51, 52, 53, 54, 55,
61  -1, -1, -1, -1, -1, -1, -1, -1,
62  56, 58
63 };
64 
65 /* Transfering the general-purpose registers between GDB, inferiors
66  and core files. */
67 
68 /* Fill GDB's register array with the general-purpose register values
69  in *GREGSETP. */
70 
71 void
73  const elf_gregset_t *gregsetp)
74 {
75  elf_greg_t *regp = (elf_greg_t *) gregsetp;
76  int i;
77 
78  for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
79  if (regmap[i] >= 0)
80  regcache_raw_supply (regcache, i, regp + regmap[i]);
81 }
82 
83 /* Fill registers in *GREGSETPS with the values in GDB's
84  register array. */
85 
86 void
88  elf_gregset_t *gregsetp, int regno)
89 {
90  elf_greg_t *regp = (elf_greg_t *) gregsetp;
91  int i;
92 
93  for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
94  if (regmap[i] >= 0)
95  regcache_raw_collect (regcache, i, regp + regmap[i]);
96 }
97 
98 /* Transfering floating-point registers between GDB, inferiors and cores. */
99 
100 /* Fill GDB's register array with the floating-point register values in
101  *FPREGSETP. */
102 
103 void
105  const elf_fpregset_t *fpregsetp)
106 {
107  /* NOTE: There are no floating-point registers for TILE-Gx. */
108 }
109 
110 /* Fill register REGNO (if it is a floating-point register) in
111  *FPREGSETP with the value in GDB's register array. If REGNO is -1,
112  do this for all registers. */
113 
114 void
116  elf_fpregset_t *fpregsetp, int regno)
117 {
118  /* NOTE: There are no floating-point registers for TILE-Gx. */
119 }
120 
121 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
122  for all registers. */
123 
124 static void
126  struct regcache *regcache, int regnum)
127 {
128  elf_gregset_t regs;
129  int tid;
130 
131  tid = ptid_get_lwp (inferior_ptid);
132  if (tid == 0)
133  tid = ptid_get_pid (inferior_ptid);
134 
135  if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
136  perror_with_name (_("Couldn't get registers"));
137 
138  supply_gregset (regcache, (const elf_gregset_t *)&regs);
139 }
140 
141 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
142  this for all registers. */
143 
144 static void
146  struct regcache *regcache, int regnum)
147 {
148  elf_gregset_t regs;
149  int tid;
150 
151  tid = ptid_get_lwp (inferior_ptid);
152  if (tid == 0)
153  tid = ptid_get_pid (inferior_ptid);
154 
155  if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
156  perror_with_name (_("Couldn't get registers"));
157 
158  fill_gregset (regcache, &regs, regnum);
159 
160  if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
161  perror_with_name (_("Couldn't write registers"));
162 }
163 
164 
166 
167 void
169 {
170  struct target_ops *t;
171 
172  /* Fill in the generic GNU/Linux methods. */
173  t = linux_target ();
174 
175  /* Add our register access methods. */
178 
179  /* Register the target. */
181 }
void fill_fpregset(const struct regcache *regcache, elf_fpregset_t *fpregsetp, int regno)
initialize_file_ftype _initialize_tile_linux_nat
#define _(String)
Definition: gdb_locale.h:40
void fill_gregset(const struct regcache *regcache, elf_gregset_t *gregsetp, int regno)
PTRACE_TYPE_RET ptrace()
void initialize_file_ftype(void)
Definition: defs.h:281
void supply_gregset(struct regcache *regcache, const elf_gregset_t *gregsetp)
void supply_fpregset(struct regcache *regcache, const elf_fpregset_t *fpregsetp)
void linux_nat_add_target(struct target_ops *t)
Definition: linux-nat.c:4972
int regnum
Definition: aarch64-tdep.c:69
struct target_ops * linux_target(void)
Definition: linux-nat.c:4544
int ptid_get_pid(ptid_t ptid)
Definition: ptid.c:52
static const int regmap[]
void(* to_fetch_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:472
void void void void void void void void void perror_with_name(const char *string) ATTRIBUTE_NORETURN
Definition: utils.c:979
static void fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
ptid_t inferior_ptid
Definition: infcmd.c:124
static void store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
#define PTRACE_SETREGS
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1041
long ptid_get_lwp(ptid_t ptid)
Definition: ptid.c:60
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1071
#define PTRACE_TYPE_ARG3
Definition: config.h:658
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:474
#define PTRACE_GETREGS