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glibc/nptl_db/thread_dbP.h

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/* Private header for thread debug library
Copyright (C) 2003-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _THREAD_DBP_H
#define _THREAD_DBP_H 1
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include "proc_service.h"
#include "thread_db.h"
#include <pthreadP.h> /* This is for *_BITMASK only. */
#include <list.h>
#include <gnu/lib-names.h>
#include <libc-diag.h>
/* Indeces for the symbol names. */
enum
{
# define DB_STRUCT(type) SYM_SIZEOF_##type,
# define DB_STRUCT_FIELD(type, field) SYM_##type##_FIELD_##field,
# define DB_STRUCT_FLEXIBLE_ARRAY(type, field) DB_STRUCT_FIELD (type, field)
# define DB_SYMBOL(name) SYM_##name,
# define DB_FUNCTION(name) SYM_##name,
# define DB_VARIABLE(name) SYM_##name, SYM_DESC_##name,
# include "structs.def"
# undef DB_STRUCT
# undef DB_STRUCT_FIELD
# undef DB_STRUCT_FLEXIBLE_ARRAY
# undef DB_SYMBOL
# undef DB_FUNCTION
# undef DB_VARIABLE
SYM_TH_UNIQUE_CONST_THREAD_AREA,
SYM_TH_UNIQUE_REGISTER64,
SYM_TH_UNIQUE_REGISTER32,
SYM_TH_UNIQUE_REGISTER64_THREAD_AREA,
SYM_TH_UNIQUE_REGISTER32_THREAD_AREA,
SYM_NUM_MESSAGES
};
/* Comment out the following for less verbose output. */
#ifndef NDEBUG
# define LOG(c) if (__td_debug) write (2, c "\n", strlen (c "\n"))
extern int __td_debug attribute_hidden;
#else
# define LOG(c)
#endif
#define DB_DESC_SIZE(desc) ((desc)[0])
#define DB_DESC_NELEM(desc) ((desc)[1])
#define DB_DESC_OFFSET(desc) ((desc)[2])
#define DB_SIZEOF_DESC (3 * sizeof (uint32_t))
#define DB_DEFINE_DESC(name, size, nelem, offset) \
const uint32_t name[3] = { (size), (nelem), (offset) }
typedef uint32_t db_desc_t[3];
/* Handle for a process. This type is opaque. */
struct td_thragent
{
/* Chain on the list of all agent structures. */
list_t list;
/* Delivered by the debugger and we have to pass it back in the
proc callbacks. */
struct ps_prochandle *ph;
/* Cached values read from the inferior. */
# define DB_STRUCT(type) \
uint32_t ta_sizeof_##type;
# define DB_STRUCT_FIELD(type, field) \
db_desc_t ta_field_##type##_##field;
# define DB_STRUCT_FLEXIBLE_ARRAY(type, field) DB_STRUCT_FIELD (type, field)
# define DB_SYMBOL(name) \
psaddr_t ta_addr_##name;
# define DB_FUNCTION(name) \
psaddr_t ta_addr_##name;
# define DB_VARIABLE(name) \
psaddr_t ta_addr_##name; \
db_desc_t ta_var_##name;
# include "structs.def"
# undef DB_STRUCT
# undef DB_STRUCT_FIELD
# undef DB_STRUCT_FLEXIBLE_ARRAY
# undef DB_FUNCTION
# undef DB_SYMBOL
# undef DB_VARIABLE
psaddr_t ta_addr__rtld_global;
/* The method of locating a thread's th_unique value. */
enum
{
ta_howto_unknown,
ta_howto_reg,
ta_howto_reg_thread_area,
ta_howto_const_thread_area
} ta_howto;
union
{
uint32_t const_thread_area; /* Constant argument to ps_get_thread_area. */
/* These are as if the descriptor of the field in prregset_t,
but DB_DESC_NELEM is overloaded as follows: */
db_desc_t reg; /* Signed bias applied to register value. */
db_desc_t reg_thread_area; /* Bits to scale down register value. */
} ta_howto_data;
};
/* List of all known descriptors. */
extern list_t __td_agent_list attribute_hidden;
/* Function used to test for correct thread agent pointer. */
static inline bool
ta_ok (const td_thragent_t *ta)
{
list_t *runp;
list_for_each (runp, &__td_agent_list)
if (list_entry (runp, td_thragent_t, list) == ta)
return true;
return false;
}
/* Internal wrappers around ps_pglobal_lookup. */
extern ps_err_e td_mod_lookup (struct ps_prochandle *ps, const char *modname,
int idx, psaddr_t *sym_addr) attribute_hidden;
#define td_lookup(ps, idx, sym_addr) \
td_mod_lookup ((ps), LIBPTHREAD_SO, (idx), (sym_addr))
/* Store in psaddr_t VAR the address of inferior's symbol NAME. */
#define DB_GET_SYMBOL(var, ta, name) \
(((ta)->ta_addr_##name == 0 \
&& td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
? TD_ERR : ((var) = (ta)->ta_addr_##name, TD_OK))
/* Store in psaddr_t VAR the value of ((TYPE) PTR)->FIELD[IDX] in the inferior.
A target field smaller than psaddr_t is zero-extended. */
#define DB_GET_FIELD(var, ta, ptr, type, field, idx) \
_td_fetch_value ((ta), (ta)->ta_field_##type##_##field, \
SYM_##type##_FIELD_##field, \
(psaddr_t) 0 + (idx), (ptr), &(var))
/* With GCC 5.3 when compiling with -Os the compiler emits a warning
that slot may be used uninitialized. This is never the case since
the dynamic loader initializes the slotinfo list and
dtv_slotinfo_list will point slot at the first entry. Therefore
when DB_GET_FIELD_ADDRESS is called with a slot for ptr, the slot is
always initialized. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
#define DB_GET_FIELD_ADDRESS(var, ta, ptr, type, field, idx) \
((var) = (ptr), _td_locate_field ((ta), (ta)->ta_field_##type##_##field, \
SYM_##type##_FIELD_##field, \
(psaddr_t) 0 + (idx), &(var)))
DIAG_POP_NEEDS_COMMENT;
extern td_err_e _td_locate_field (td_thragent_t *ta,
db_desc_t desc, int descriptor_name,
psaddr_t idx,
psaddr_t *address) attribute_hidden;
/* Like DB_GET_FIELD, but PTR is a local pointer to a structure that
has already been copied in from the inferior. */
#define DB_GET_FIELD_LOCAL(var, ta, ptr, type, field, idx) \
_td_fetch_value_local ((ta), (ta)->ta_field_##type##_##field, \
SYM_##type##_FIELD_##field, \
(psaddr_t) 0 + (idx), (ptr), &(var))
/* Store in psaddr_t VAR the value of variable NAME[IDX] in the inferior.
A target value smaller than psaddr_t is zero-extended. */
#define DB_GET_VALUE(var, ta, name, idx) \
(((ta)->ta_addr_##name == 0 \
&& td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
? TD_ERR \
: _td_fetch_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name, \
(psaddr_t) 0 + (idx), (ta)->ta_addr_##name, &(var)))
/* Helper functions for those. */
extern td_err_e _td_fetch_value (td_thragent_t *ta,
db_desc_t field, int descriptor_name,
psaddr_t idx, psaddr_t address,
psaddr_t *result) attribute_hidden;
extern td_err_e _td_fetch_value_local (td_thragent_t *ta,
db_desc_t field,
int descriptor_name,
psaddr_t idx, void *address,
psaddr_t *result) attribute_hidden;
/* Store psaddr_t VALUE in ((TYPE) PTR)->FIELD[IDX] in the inferior.
A target field smaller than psaddr_t is zero-extended. */
#define DB_PUT_FIELD(ta, ptr, type, field, idx, value) \
_td_store_value ((ta), (ta)->ta_field_##type##_##field, \
SYM_##type##_FIELD_##field, \
(psaddr_t) 0 + (idx), (ptr), (value))
#define DB_PUT_FIELD_LOCAL(ta, ptr, type, field, idx, value) \
_td_store_value_local ((ta), (ta)->ta_field_##type##_##field, \
SYM_##type##_FIELD_##field, \
(psaddr_t) 0 + (idx), (ptr), (value))
/* Store psaddr_t VALUE in variable NAME[IDX] in the inferior.
A target field smaller than psaddr_t is zero-extended. */
#define DB_PUT_VALUE(ta, name, idx, value) \
(((ta)->ta_addr_##name == 0 \
&& td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK) \
? TD_ERR \
: _td_store_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name, \
(psaddr_t) 0 + (idx), (ta)->ta_addr_##name, (value)))
/* Helper functions for those. */
extern td_err_e _td_store_value (td_thragent_t *ta,
db_desc_t field, int descriptor_name,
psaddr_t idx, psaddr_t address,
psaddr_t value) attribute_hidden;
extern td_err_e _td_store_value_local (td_thragent_t *ta,
db_desc_t field, int descriptor_name,
psaddr_t idx, void *address,
psaddr_t value) attribute_hidden;
#define DB_GET_STRUCT(var, ta, ptr, type) \
({ td_err_e _err = TD_OK; \
if ((ta)->ta_sizeof_##type == 0) \
_err = _td_check_sizeof ((ta), &(ta)->ta_sizeof_##type, \
SYM_SIZEOF_##type); \
if (_err == TD_OK) \
_err = ps_pdread ((ta)->ph, (ptr), \
(var) = __alloca ((ta)->ta_sizeof_##type), \
(ta)->ta_sizeof_##type) \
== PS_OK ? TD_OK : TD_ERR; \
else \
(var) = NULL; \
_err; \
})
#define DB_PUT_STRUCT(ta, ptr, type, copy) \
({ assert ((ta)->ta_sizeof_##type != 0); \
ps_pdwrite ((ta)->ph, (ptr), (copy), (ta)->ta_sizeof_##type) \
== PS_OK ? TD_OK : TD_ERR; \
})
extern td_err_e _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep,
int sizep_name) attribute_hidden;
extern td_err_e __td_ta_lookup_th_unique (const td_thragent_t *ta,
lwpid_t lwpid, td_thrhandle_t *th);
/* Try to initialize TA->ta_addr__rtld_global. Return true on
success, false on failure (which may be cached). */
bool __td_ta_rtld_global (td_thragent_t *ta) attribute_hidden;
/* Obtain the address of the list_t fields _dl_stack_user and
_dl_stack_used in _rtld_global, or fall back to the global
variables of the same name (to support statically linked
programs). */
td_err_e __td_ta_stack_user (td_thragent_t *ta, psaddr_t *plist)
attribute_hidden;
td_err_e __td_ta_stack_used (td_thragent_t *ta, psaddr_t *plist)
attribute_hidden;
#endif /* thread_dbP.h */
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