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/tmp/gdb-7.10/gdb/mips64obsd-nat.c
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1 /* Native-dependent code for OpenBSD/mips64.
2 
3  Copyright (C) 2004-2015 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 "regcache.h"
23 #include "target.h"
24 
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <machine/reg.h>
28 
29 #include "mips-tdep.h"
30 #include "inf-ptrace.h"
31 #include "obsd-nat.h"
32 
33 /* Shorthand for some register numbers used below. */
34 #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
35 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
36 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
37 
38 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
39 
40 static void
41 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
42 {
43  const char *regs = gregs;
44  int regnum;
45 
46  for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
47  regcache_raw_supply (regcache, regnum, regs + regnum * 8);
48 
49  for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
50  regcache_raw_supply (regcache, regnum, regs + (regnum + 2) * 8);
51 }
52 
53 /* Collect the general-purpose registers from REGCACHE and store them
54  in GREGS. */
55 
56 static void
58  void *gregs, int regnum)
59 {
60  char *regs = gregs;
61  int i;
62 
63  for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
64  {
65  if (regnum == -1 || regnum == i)
66  regcache_raw_collect (regcache, i, regs + i * 8);
67  }
68 
69  for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
70  {
71  if (regnum == -1 || regnum == i)
72  regcache_raw_collect (regcache, i, regs + (i + 2) * 8);
73  }
74 }
75 
76 
77 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
78  for all registers. */
79 
80 static void
82  struct regcache *regcache, int regnum)
83 {
84  struct reg regs;
85 
86  if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
87  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
88  perror_with_name (_("Couldn't get registers"));
89 
90  mips64obsd_supply_gregset (regcache, &regs);
91 }
92 
93 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
94  this for all registers. */
95 
96 static void
98  struct regcache *regcache, int regnum)
99 {
100  struct reg regs;
101 
102  if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
103  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
104  perror_with_name (_("Couldn't get registers"));
105 
106  mips64obsd_collect_gregset (regcache, &regs, regnum);
107 
108  if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
109  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
110  perror_with_name (_("Couldn't write registers"));
111 }
112 
113 
114 /* Provide a prototype to silence -Wmissing-prototypes. */
115 void _initialize_mips64obsd_nat (void);
116 
117 void
119 {
120  struct target_ops *t;
121 
122  t = inf_ptrace_target ();
125  obsd_add_target (t);
126 }
void obsd_add_target(struct target_ops *t)
Definition: obsd-nat.c:181
void _initialize_mips64obsd_nat(void)
#define _(String)
Definition: gdb_locale.h:40
struct target_ops * inf_ptrace_target(void)
Definition: inf-ptrace.c:668
PTRACE_TYPE_RET ptrace()
int regnum
Definition: aarch64-tdep.c:69
static void mips64obsd_store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: regdef.h:22
#define MIPS_FSR_REGNUM
int ptid_get_pid(ptid_t ptid)
Definition: ptid.c:52
void(* to_fetch_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:472
static void mips64obsd_collect_gregset(const struct regcache *regcache, void *gregs, int regnum)
void void void void void void void void void perror_with_name(const char *string) ATTRIBUTE_NORETURN
Definition: utils.c:979
ptid_t inferior_ptid
Definition: infcmd.c:124
#define MIPS_PC_REGNUM
static void mips64obsd_fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
#define MIPS_FP0_REGNUM
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1041
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1071
#define PTRACE_TYPE_ARG3
Definition: config.h:658
static void mips64obsd_supply_gregset(struct regcache *regcache, const void *gregs)
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:474