1/* Private header for thread debug library
2 Copyright (C) 2003-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _THREAD_DBP_H
20#define _THREAD_DBP_H 1
21
22#include <stdbool.h>
23#include <stdint.h>
24#include <string.h>
25#include <stdlib.h>
26#include <unistd.h>
27#include <assert.h>
28#include "proc_service.h"
29#include "thread_db.h"
30#include "../nptl/pthreadP.h" /* This is for *_BITMASK only. */
31#include <list.h>
32#include <gnu/lib-names.h>
33#include <libc-diag.h>
34
35/* Indeces for the symbol names. */
36enum
37 {
38# define DB_STRUCT(type) SYM_SIZEOF_##type,
39# define DB_STRUCT_FIELD(type, field) SYM_##type##_FIELD_##field,
40# define DB_STRUCT_FLEXIBLE_ARRAY(type, field) DB_STRUCT_FIELD (type, field)
41# define DB_SYMBOL(name) SYM_##name,
42# define DB_FUNCTION(name) SYM_##name,
43# define DB_VARIABLE(name) SYM_##name, SYM_DESC_##name,
44# include "structs.def"
45# undef DB_STRUCT
46# undef DB_STRUCT_FIELD
47# undef DB_STRUCT_FLEXIBLE_ARRAY
48# undef DB_SYMBOL
49# undef DB_FUNCTION
50# undef DB_VARIABLE
51
52 SYM_TH_UNIQUE_CONST_THREAD_AREA,
53 SYM_TH_UNIQUE_REGISTER64,
54 SYM_TH_UNIQUE_REGISTER32,
55 SYM_TH_UNIQUE_REGISTER64_THREAD_AREA,
56 SYM_TH_UNIQUE_REGISTER32_THREAD_AREA,
57
58 SYM_NUM_MESSAGES
59 };
60
61
62/* Comment out the following for less verbose output. */
63#ifndef NDEBUG
64# define LOG(c) if (__td_debug) write (2, c "\n", strlen (c "\n"))
65extern int __td_debug attribute_hidden;
66#else
67# define LOG(c)
68#endif
69
70
71#define DB_DESC_SIZE(desc) ((desc)[0])
72#define DB_DESC_NELEM(desc) ((desc)[1])
73#define DB_DESC_OFFSET(desc) ((desc)[2])
74#define DB_SIZEOF_DESC (3 * sizeof (uint32_t))
75#define DB_DEFINE_DESC(name, size, nelem, offset) \
76 const uint32_t name[3] = { (size), (nelem), (offset) }
77typedef uint32_t db_desc_t[3];
78
79
80/* Handle for a process. This type is opaque. */
81struct td_thragent
82{
83 /* Chain on the list of all agent structures. */
84 list_t list;
85
86 /* Delivered by the debugger and we have to pass it back in the
87 proc callbacks. */
88 struct ps_prochandle *ph;
89
90 /* Cached values read from the inferior. */
91# define DB_STRUCT(type) \
92 uint32_t ta_sizeof_##type;
93# define DB_STRUCT_FIELD(type, field) \
94 db_desc_t ta_field_##type##_##field;
95# define DB_STRUCT_FLEXIBLE_ARRAY(type, field) DB_STRUCT_FIELD (type, field)
96# define DB_SYMBOL(name) \
97 psaddr_t ta_addr_##name;
98# define DB_FUNCTION(name) \
99 psaddr_t ta_addr_##name;
100# define DB_VARIABLE(name) \
101 psaddr_t ta_addr_##name; \
102 db_desc_t ta_var_##name;
103# include "structs.def"
104# undef DB_STRUCT
105# undef DB_STRUCT_FIELD
106# undef DB_STRUCT_FLEXIBLE_ARRAY
107# undef DB_FUNCTION
108# undef DB_SYMBOL
109# undef DB_VARIABLE
110
111 /* The method of locating a thread's th_unique value. */
112 enum
113 {
114 ta_howto_unknown,
115 ta_howto_reg,
116 ta_howto_reg_thread_area,
117 ta_howto_const_thread_area
118 } ta_howto;
119 union
120 {
121 uint32_t const_thread_area; /* Constant argument to ps_get_thread_area. */
122 /* These are as if the descriptor of the field in prregset_t,
123 but DB_DESC_NELEM is overloaded as follows: */
124 db_desc_t reg; /* Signed bias applied to register value. */
125 db_desc_t reg_thread_area; /* Bits to scale down register value. */
126 } ta_howto_data;
127};
128
129
130/* List of all known descriptors. */
131extern list_t __td_agent_list attribute_hidden;
132
133
134/* Function used to test for correct thread agent pointer. */
135static inline bool
136ta_ok (const td_thragent_t *ta)
137{
138 list_t *runp;
139
140 list_for_each (runp, &__td_agent_list)
141 if (list_entry (runp, td_thragent_t, list) == ta)
142 return true;
143
144 return false;
145}
146
147
148/* Internal wrappers around ps_pglobal_lookup. */
149extern ps_err_e td_mod_lookup (struct ps_prochandle *ps, const char *modname,
150 int idx, psaddr_t *sym_addr) attribute_hidden;
151#define td_lookup(ps, idx, sym_addr) \
152 td_mod_lookup ((ps), LIBPTHREAD_SO, (idx), (sym_addr))
153
154
155/* Store in psaddr_t VAR the address of inferior's symbol NAME. */
156#define DB_GET_SYMBOL(var, ta, name) \
157 (((ta)->ta_addr_##name == 0 \
158 && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
159 ? TD_ERR : ((var) = (ta)->ta_addr_##name, TD_OK))
160
161/* Store in psaddr_t VAR the value of ((TYPE) PTR)->FIELD[IDX] in the inferior.
162 A target field smaller than psaddr_t is zero-extended. */
163#define DB_GET_FIELD(var, ta, ptr, type, field, idx) \
164 _td_fetch_value ((ta), (ta)->ta_field_##type##_##field, \
165 SYM_##type##_FIELD_##field, \
166 (psaddr_t) 0 + (idx), (ptr), &(var))
167
168/* With GCC 5.3 when compiling with -Os the compiler emits a warning
169 that slot may be used uninitialized. This is never the case since
170 the dynamic loader initializes the slotinfo list and
171 dtv_slotinfo_list will point slot at the first entry. Therefore
172 when DB_GET_FIELD_ADDRESS is called with a slot for ptr, the slot is
173 always initialized. */
174DIAG_PUSH_NEEDS_COMMENT;
175DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
176#define DB_GET_FIELD_ADDRESS(var, ta, ptr, type, field, idx) \
177 ((var) = (ptr), _td_locate_field ((ta), (ta)->ta_field_##type##_##field, \
178 SYM_##type##_FIELD_##field, \
179 (psaddr_t) 0 + (idx), &(var)))
180DIAG_POP_NEEDS_COMMENT;
181
182extern td_err_e _td_locate_field (td_thragent_t *ta,
183 db_desc_t desc, int descriptor_name,
184 psaddr_t idx,
185 psaddr_t *address) attribute_hidden;
186
187
188/* Like DB_GET_FIELD, but PTR is a local pointer to a structure that
189 has already been copied in from the inferior. */
190#define DB_GET_FIELD_LOCAL(var, ta, ptr, type, field, idx) \
191 _td_fetch_value_local ((ta), (ta)->ta_field_##type##_##field, \
192 SYM_##type##_FIELD_##field, \
193 (psaddr_t) 0 + (idx), (ptr), &(var))
194
195/* Store in psaddr_t VAR the value of variable NAME[IDX] in the inferior.
196 A target value smaller than psaddr_t is zero-extended. */
197#define DB_GET_VALUE(var, ta, name, idx) \
198 (((ta)->ta_addr_##name == 0 \
199 && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
200 ? TD_ERR \
201 : _td_fetch_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name, \
202 (psaddr_t) 0 + (idx), (ta)->ta_addr_##name, &(var)))
203
204/* Helper functions for those. */
205extern td_err_e _td_fetch_value (td_thragent_t *ta,
206 db_desc_t field, int descriptor_name,
207 psaddr_t idx, psaddr_t address,
208 psaddr_t *result) attribute_hidden;
209extern td_err_e _td_fetch_value_local (td_thragent_t *ta,
210 db_desc_t field,
211 int descriptor_name,
212 psaddr_t idx, void *address,
213 psaddr_t *result) attribute_hidden;
214
215/* Store psaddr_t VALUE in ((TYPE) PTR)->FIELD[IDX] in the inferior.
216 A target field smaller than psaddr_t is zero-extended. */
217#define DB_PUT_FIELD(ta, ptr, type, field, idx, value) \
218 _td_store_value ((ta), (ta)->ta_field_##type##_##field, \
219 SYM_##type##_FIELD_##field, \
220 (psaddr_t) 0 + (idx), (ptr), (value))
221
222#define DB_PUT_FIELD_LOCAL(ta, ptr, type, field, idx, value) \
223 _td_store_value_local ((ta), (ta)->ta_field_##type##_##field, \
224 SYM_##type##_FIELD_##field, \
225 (psaddr_t) 0 + (idx), (ptr), (value))
226
227/* Store psaddr_t VALUE in variable NAME[IDX] in the inferior.
228 A target field smaller than psaddr_t is zero-extended. */
229#define DB_PUT_VALUE(ta, name, idx, value) \
230 (((ta)->ta_addr_##name == 0 \
231 && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
232 ? TD_ERR \
233 : _td_store_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name, \
234 (psaddr_t) 0 + (idx), (ta)->ta_addr_##name, (value)))
235
236/* Helper functions for those. */
237extern td_err_e _td_store_value (td_thragent_t *ta,
238 db_desc_t field, int descriptor_name,
239 psaddr_t idx, psaddr_t address,
240 psaddr_t value) attribute_hidden;
241extern td_err_e _td_store_value_local (td_thragent_t *ta,
242 db_desc_t field, int descriptor_name,
243 psaddr_t idx, void *address,
244 psaddr_t value) attribute_hidden;
245
246#define DB_GET_STRUCT(var, ta, ptr, type) \
247 ({ td_err_e _err = TD_OK; \
248 if ((ta)->ta_sizeof_##type == 0) \
249 _err = _td_check_sizeof ((ta), &(ta)->ta_sizeof_##type, \
250 SYM_SIZEOF_##type); \
251 if (_err == TD_OK) \
252 _err = ps_pdread ((ta)->ph, (ptr), \
253 (var) = __alloca ((ta)->ta_sizeof_##type), \
254 (ta)->ta_sizeof_##type) \
255 == PS_OK ? TD_OK : TD_ERR; \
256 else \
257 (var) = NULL; \
258 _err; \
259 })
260#define DB_PUT_STRUCT(ta, ptr, type, copy) \
261 ({ assert ((ta)->ta_sizeof_##type != 0); \
262 ps_pdwrite ((ta)->ph, (ptr), (copy), (ta)->ta_sizeof_##type) \
263 == PS_OK ? TD_OK : TD_ERR; \
264 })
265
266extern td_err_e _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep,
267 int sizep_name) attribute_hidden;
268
269extern td_err_e __td_ta_lookup_th_unique (const td_thragent_t *ta,
270 lwpid_t lwpid, td_thrhandle_t *th);
271
272#endif /* thread_dbP.h */
273