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/tmp/gdb-7.10/gdb/trad-frame.c
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1 /* Traditional frame unwind support, for GDB the GNU Debugger.
2 
3  Copyright (C) 2003-2015 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 "frame.h"
22 #include "trad-frame.h"
23 #include "regcache.h"
24 #include "frame-unwind.h"
25 #include "value.h"
26 
28 {
32  struct frame_id this_id;
33 };
34 
35 struct trad_frame_cache *
37 {
38  struct trad_frame_cache *this_trad_cache;
39 
40  this_trad_cache = FRAME_OBSTACK_ZALLOC (struct trad_frame_cache);
41  this_trad_cache->prev_regs = trad_frame_alloc_saved_regs (this_frame);
42  this_trad_cache->this_frame = this_frame;
43  return this_trad_cache;
44 }
45 
46 /* A traditional frame is unwound by analysing the function prologue
47  and using the information gathered to track registers. For
48  non-optimized frames, the technique is reliable (just need to check
49  for all potential instruction sequences). */
50 
51 struct trad_frame_saved_reg *
53 {
54  int regnum;
55  struct gdbarch *gdbarch = get_frame_arch (this_frame);
56  int numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
57  struct trad_frame_saved_reg *this_saved_regs
58  = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
59 
60  for (regnum = 0; regnum < numregs; regnum++)
61  {
62  this_saved_regs[regnum].realreg = regnum;
63  this_saved_regs[regnum].addr = -1;
64  }
65  return this_saved_regs;
66 }
67 
68 enum { TF_REG_VALUE = -1, TF_REG_UNKNOWN = -2 };
69 
70 int
71 trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
72 {
73  return (this_saved_regs[regnum].realreg == TF_REG_VALUE);
74 }
75 
76 int
77 trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
78 {
79  return (this_saved_regs[regnum].realreg >= 0
80  && this_saved_regs[regnum].addr != -1);
81 }
82 
83 int
84 trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
85  int regnum)
86 {
87  return (this_saved_regs[regnum].realreg >= 0
88  && this_saved_regs[regnum].addr == -1);
89 }
90 
91 void
92 trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
93  int regnum, LONGEST val)
94 {
95  /* Make the REALREG invalid, indicating that the ADDR contains the
96  register's value. */
97  this_saved_regs[regnum].realreg = TF_REG_VALUE;
98  this_saved_regs[regnum].addr = val;
99 }
100 
101 void
103  int regnum, LONGEST val)
104 {
105  /* External interface for users of trad_frame_cache
106  (who cannot access the prev_regs object directly). */
107  trad_frame_set_value (this_trad_cache->prev_regs, regnum, val);
108 }
109 
110 void
112  int regnum, int realreg)
113 {
114  this_trad_cache->prev_regs[regnum].realreg = realreg;
115  this_trad_cache->prev_regs[regnum].addr = -1;
116 }
117 
118 void
119 trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
120  int regnum, CORE_ADDR addr)
121 {
122  this_trad_cache->prev_regs[regnum].addr = addr;
123 }
124 
125 void
127  int regnum)
128 {
129  /* Make the REALREG invalid, indicating that the value is not known. */
130  this_saved_regs[regnum].realreg = TF_REG_UNKNOWN;
131  this_saved_regs[regnum].addr = -1;
132 }
133 
134 struct value *
136  struct trad_frame_saved_reg this_saved_regs[],
137  int regnum)
138 {
139  if (trad_frame_addr_p (this_saved_regs, regnum))
140  /* The register was saved in memory. */
141  return frame_unwind_got_memory (this_frame, regnum,
142  this_saved_regs[regnum].addr);
143  else if (trad_frame_realreg_p (this_saved_regs, regnum))
144  return frame_unwind_got_register (this_frame, regnum,
145  this_saved_regs[regnum].realreg);
146  else if (trad_frame_value_p (this_saved_regs, regnum))
147  /* The register's value is available. */
148  return frame_unwind_got_constant (this_frame, regnum,
149  this_saved_regs[regnum].addr);
150  else
151  return frame_unwind_got_optimized (this_frame, regnum);
152 }
153 
154 struct value *
155 trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
156  struct frame_info *this_frame,
157  int regnum)
158 {
159  return trad_frame_get_prev_register (this_frame, this_trad_cache->prev_regs,
160  regnum);
161 }
162 
163 void
164 trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
165  struct frame_id this_id)
166 {
167  this_trad_cache->this_id = this_id;
168 }
169 
170 void
171 trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
172  struct frame_id *this_id)
173 {
174  (*this_id) = this_trad_cache->this_id;
175 }
176 
177 void
179  CORE_ADDR this_base)
180 {
181  this_trad_cache->this_base = this_base;
182 }
183 
184 CORE_ADDR
186 {
187  return this_trad_cache->this_base;
188 }
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:119
struct trad_frame_saved_reg * prev_regs
Definition: trad-frame.c:31
int trad_frame_realreg_p(struct trad_frame_saved_reg this_saved_regs[], int regnum)
Definition: trad-frame.c:84
bfd_vma CORE_ADDR
Definition: common-types.h:41
struct value * trad_frame_get_prev_register(struct frame_info *this_frame, struct trad_frame_saved_reg this_saved_regs[], int regnum)
Definition: trad-frame.c:135
int trad_frame_addr_p(struct trad_frame_saved_reg this_saved_regs[], int regnum)
Definition: trad-frame.c:77
struct value * frame_unwind_got_memory(struct frame_info *frame, int regnum, CORE_ADDR addr)
Definition: frame-unwind.c:228
void trad_frame_set_value(struct trad_frame_saved_reg this_saved_regs[], int regnum, LONGEST val)
Definition: trad-frame.c:92
void trad_frame_set_reg_realreg(struct trad_frame_cache *this_trad_cache, int regnum, int realreg)
Definition: trad-frame.c:111
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:164
int trad_frame_value_p(struct trad_frame_saved_reg this_saved_regs[], int regnum)
Definition: trad-frame.c:71
int gdbarch_num_regs(struct gdbarch *gdbarch)
Definition: gdbarch.c:1898
CORE_ADDR this_base
Definition: trad-frame.c:30
#define FRAME_OBSTACK_ZALLOC(TYPE)
Definition: frame.h:660
struct value * frame_unwind_got_constant(struct frame_info *frame, int regnum, ULONGEST val)
Definition: frame-unwind.c:241
int gdbarch_num_pseudo_regs(struct gdbarch *gdbarch)
Definition: gdbarch.c:1916
void trad_frame_get_id(struct trad_frame_cache *this_trad_cache, struct frame_id *this_id)
Definition: trad-frame.c:171
struct trad_frame_cache * trad_frame_cache_zalloc(struct frame_info *this_frame)
Definition: trad-frame.c:36
void trad_frame_set_reg_value(struct trad_frame_cache *this_trad_cache, int regnum, LONGEST val)
Definition: trad-frame.c:102
int regnum
Definition: aarch64-tdep.c:69
struct frame_info * this_frame
Definition: trad-frame.c:29
Definition: value.c:172
struct frame_id this_id
Definition: trad-frame.c:32
struct value * frame_unwind_got_optimized(struct frame_info *frame, int regnum)
Definition: frame-unwind.c:197
struct trad_frame_saved_reg * trad_frame_alloc_saved_regs(struct frame_info *this_frame)
Definition: trad-frame.c:52
struct value * frame_unwind_got_register(struct frame_info *frame, int regnum, int new_regnum)
Definition: frame-unwind.c:218
void trad_frame_set_this_base(struct trad_frame_cache *this_trad_cache, CORE_ADDR this_base)
Definition: trad-frame.c:178
void trad_frame_set_unknown(struct trad_frame_saved_reg this_saved_regs[], int regnum)
Definition: trad-frame.c:126
CORE_ADDR trad_frame_get_this_base(struct trad_frame_cache *this_trad_cache)
Definition: trad-frame.c:185
struct value * trad_frame_get_register(struct trad_frame_cache *this_trad_cache, struct frame_info *this_frame, int regnum)
Definition: trad-frame.c:155
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
#define FRAME_OBSTACK_CALLOC(NUMBER, TYPE)
Definition: frame.h:662
long long LONGEST
Definition: common-types.h:52