1/* Internal interfaces for the GNU/Linux specific target code for gdbserver.
2   Copyright (C) 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
3
4   This file is part of GDB.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19#ifdef HAVE_THREAD_DB_H
20#include <thread_db.h>
21#endif
22
23#ifdef HAVE_LINUX_REGSETS
24typedef void (*regset_fill_func) (void *);
25typedef void (*regset_store_func) (const void *);
26enum regset_type {
27  GENERAL_REGS,
28  FP_REGS,
29  EXTENDED_REGS,
30};
31
32struct regset_info
33{
34  int get_request, set_request;
35  int size;
36  enum regset_type type;
37  regset_fill_func fill_function;
38  regset_store_func store_function;
39};
40extern struct regset_info target_regsets[];
41#endif
42
43struct linux_target_ops
44{
45  int num_regs;
46  int *regmap;
47  int (*cannot_fetch_register) (int);
48
49  /* Returns 0 if we can store the register, 1 if we can not
50     store the register, and 2 if failure to store the register
51     is acceptable.  */
52  int (*cannot_store_register) (int);
53  CORE_ADDR (*get_pc) (void);
54  void (*set_pc) (CORE_ADDR newpc);
55  const unsigned char *breakpoint;
56  int breakpoint_len;
57  CORE_ADDR (*breakpoint_reinsert_addr) (void);
58
59
60  int decr_pc_after_break;
61  int (*breakpoint_at) (CORE_ADDR pc);
62
63  /* Watchpoint related functions.  See target.h for comments.  */
64  int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
65  int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
66  int (*stopped_by_watchpoint) (void);
67  CORE_ADDR (*stopped_data_address) (void);
68
69  /* Whether to left-pad registers for PEEKUSR/POKEUSR if they are smaller
70     than an xfer unit.  */
71  int left_pad_xfer;
72
73  /* What string to report to GDB when it asks for the architecture,
74     or NULL not to answer.  */
75  const char *arch_string;
76};
77
78extern struct linux_target_ops the_low_target;
79
80#define get_process(inf) ((struct process_info *)(inf))
81#define get_thread_process(thr) (get_process (inferior_target_data (thr)))
82#define get_process_thread(proc) ((struct thread_info *) \
83				  find_inferior_id (&all_threads, \
84				  get_process (proc)->tid))
85
86struct process_info
87{
88  struct inferior_list_entry head;
89  int thread_known;
90  unsigned long lwpid;
91  unsigned long tid;
92
93  /* If this flag is set, the next SIGSTOP will be ignored (the
94     process will be immediately resumed).  This means that either we
95     sent the SIGSTOP to it ourselves and got some other pending event
96     (so the SIGSTOP is still pending), or that we stopped the
97     inferior implicitly via PTRACE_ATTACH and have not waited for it
98     yet.  */
99  int stop_expected;
100
101  /* If this flag is set, the process is known to be stopped right now (stop
102     event already received in a wait()).  */
103  int stopped;
104
105  /* When stopped is set, the last wait status recorded for this process.  */
106  int last_status;
107
108  /* If this flag is set, we have sent a SIGSTOP to this process and are
109     waiting for it to stop.  */
110  int sigstop_sent;
111
112  /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
113     been reported.  */
114  int status_pending_p;
115  int status_pending;
116
117  /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
118  int pending_is_breakpoint;
119  CORE_ADDR pending_stop_pc;
120
121  /* If this is non-zero, it is a breakpoint to be reinserted at our next
122     stop (SIGTRAP stops only).  */
123  CORE_ADDR bp_reinsert;
124
125  /* If this flag is set, the last continue operation on this process
126     was a single-step.  */
127  int stepping;
128
129  /* If this is non-zero, it points to a chain of signals which need to
130     be delivered to this process.  */
131  struct pending_signals *pending_signals;
132
133  /* A link used when resuming.  It is initialized from the resume request,
134     and then processed and cleared in linux_resume_one_process.  */
135
136  struct thread_resume *resume;
137
138#ifdef HAVE_THREAD_DB_H
139  /* The thread handle, used for e.g. TLS access.  */
140  td_thrhandle_t th;
141#endif
142};
143
144extern struct inferior_list all_processes;
145
146void linux_attach_lwp (unsigned long pid, unsigned long tid);
147
148int thread_db_init (void);
149int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
150			       CORE_ADDR load_module, CORE_ADDR *address);
151