GDB (xrefs)
/tmp/gdb-7.10/gdb/std-regs.c
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1 /* Builtin frame register, for GDB, the GNU debugger.
2 
3  Copyright (C) 2002-2015 Free Software Foundation, Inc.
4 
5  Contributed by Red Hat.
6 
7  This file is part of GDB.
8 
9  This program is free software; you can redistribute it and/or modify
10  it under the terms of the GNU General Public License as published by
11  the Free Software Foundation; either version 3 of the License, or
12  (at your option) any later version.
13 
14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  GNU General Public License for more details.
18 
19  You should have received a copy of the GNU General Public License
20  along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 
22 #include "defs.h"
23 #include "user-regs.h"
24 #include "frame.h"
25 #include "gdbtypes.h"
26 #include "value.h"
27 static struct value *
28 value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton)
29 {
30  struct gdbarch *gdbarch = get_frame_arch (frame);
31 
32  if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0)
33  /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
34  register name table overrides this built-in $fp register, there
35  is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
36  An architecture wanting to implement "$fp" as alias for a raw
37  register can do so by adding "fp" to register name table (mind
38  you, doing this is probably a dangerous thing). */
40  frame);
41  else
42  {
43  struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
44  struct value *val = allocate_value (data_ptr_type);
45  gdb_byte *buf = value_contents_raw (val);
46 
47  gdbarch_address_to_pointer (gdbarch, data_ptr_type,
48  buf, get_frame_base_address (frame));
49  return val;
50  }
51 }
52 
53 static struct value *
54 value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton)
55 {
56  struct gdbarch *gdbarch = get_frame_arch (frame);
57 
58  if (gdbarch_pc_regnum (gdbarch) >= 0)
59  return value_of_register (gdbarch_pc_regnum (gdbarch), frame);
60  else
61  {
62  struct type *func_ptr_type = builtin_type (gdbarch)->builtin_func_ptr;
63  struct value *val = allocate_value (func_ptr_type);
64  gdb_byte *buf = value_contents_raw (val);
65 
66  gdbarch_address_to_pointer (gdbarch, func_ptr_type,
67  buf, get_frame_pc (frame));
68  return val;
69  }
70 }
71 
72 static struct value *
73 value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton)
74 {
75  struct gdbarch *gdbarch = get_frame_arch (frame);
76 
77  if (gdbarch_sp_regnum (gdbarch) >= 0)
78  return value_of_register (gdbarch_sp_regnum (gdbarch), frame);
79  error (_("Standard register ``$sp'' is not available for this target"));
80 }
81 
82 static struct value *
83 value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
84 {
85  struct gdbarch *gdbarch = get_frame_arch (frame);
86 
87  if (gdbarch_ps_regnum (gdbarch) >= 0)
88  return value_of_register (gdbarch_ps_regnum (gdbarch), frame);
89  error (_("Standard register ``$ps'' is not available for this target"));
90 }
91 
92 extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */
93 
94 void
96 {
97  /* Frame based $fp, $pc, $sp and $ps. These only come into play
98  when the target does not define its own version of these
99  registers. */
104 }
struct type * builtin_func_ptr
Definition: gdbtypes.h:1544
CORE_ADDR get_frame_pc(struct frame_info *frame)
Definition: frame.c:2217
int gdbarch_deprecated_fp_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:2182
const struct builtin_type * builtin_type(struct gdbarch *gdbarch)
Definition: gdbtypes.c:4766
#define _(String)
Definition: gdb_locale.h:40
int gdbarch_ps_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:2015
struct value * allocate_value(struct type *type)
Definition: value.c:962
void initialize_file_ftype(void)
Definition: defs.h:281
int gdbarch_sp_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:1981
static struct value * value_of_builtin_frame_sp_reg(struct frame_info *frame, const void *baton)
Definition: std-regs.c:73
Definition: gdbtypes.h:749
Definition: value.c:172
CORE_ADDR get_frame_base_address(struct frame_info *fi)
Definition: frame.c:2396
void user_reg_add_builtin(const char *name, user_reg_read_ftype *read, const void *baton)
Definition: user-regs.c:85
bfd_byte gdb_byte
Definition: common-types.h:38
struct value * value_of_register(int regnum, struct frame_info *frame)
Definition: findvar.c:260
struct type * builtin_data_ptr
Definition: gdbtypes.h:1533
initialize_file_ftype _initialize_frame_reg
static struct value * value_of_builtin_frame_pc_reg(struct frame_info *frame, const void *baton)
Definition: std-regs.c:54
int gdbarch_pc_regnum(struct gdbarch *gdbarch)
Definition: gdbarch.c:1998
static struct value * value_of_builtin_frame_ps_reg(struct frame_info *frame, const void *baton)
Definition: std-regs.c:83
gdb_byte * value_contents_raw(struct value *value)
Definition: value.c:1084
void error(const char *fmt,...)
Definition: errors.c:38
void gdbarch_address_to_pointer(struct gdbarch *gdbarch, struct type *type, gdb_byte *buf, CORE_ADDR addr)
Definition: gdbarch.c:2498
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
static struct value * value_of_builtin_frame_fp_reg(struct frame_info *frame, const void *baton)
Definition: std-regs.c:28