gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009
   3    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 #ifdef HAVE_THREAD_DB_H
  21 #include <thread_db.h>
  22 #endif
  23
  24 #ifdef HAVE_LINUX_REGSETS
  25 typedef void (*regset_fill_func) (void *);
  26 typedef void (*regset_store_func) (const void *);
  27 enum regset_type {
  28   GENERAL_REGS,
  29   FP_REGS,
  30   EXTENDED_REGS,
  31 };
  32
  33 struct regset_info
  34 {
  35   int get_request, set_request;
  36   int size;
  37   enum regset_type type;
  38   regset_fill_func fill_function;
  39   regset_store_func store_function;
  40 };
  41 extern struct regset_info target_regsets[];
  42 #endif
  43
  44 struct linux_target_ops
  45 {
  46   /* Architecture-specific setup.  */
  47   void (*arch_setup) (void);
  48
  49   int num_regs;
  50   int *regmap;
  51   int (*cannot_fetch_register) (int);
  52
  53   /* Returns 0 if we can store the register, 1 if we can not
  54      store the register, and 2 if failure to store the register
  55      is acceptable.  */
  56   int (*cannot_store_register) (int);
  57   CORE_ADDR (*get_pc) (void);
  58   void (*set_pc) (CORE_ADDR newpc);
  59   const unsigned char *breakpoint;
  60   int breakpoint_len;
  61   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  62
  63
  64   int decr_pc_after_break;
  65   int (*breakpoint_at) (CORE_ADDR pc);
  66
  67   /* Watchpoint related functions.  See target.h for comments.  */
  68   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  69   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  70   int (*stopped_by_watchpoint) (void);
  71   CORE_ADDR (*stopped_data_address) (void);
  72
  73   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  74      for registers smaller than an xfer unit).  */
  75   void (*collect_ptrace_register) (int regno, char *buf);
  76   void (*supply_ptrace_register) (int regno, const char *buf);
  77 };
  78
  79 extern struct linux_target_ops the_low_target;
  80
  81 #define get_process(inf) ((struct process_info *)(inf))
  82 #define get_thread_process(thr) (get_process (inferior_target_data (thr)))
  83 #define get_process_thread(proc) ((struct thread_info *) \
  84                                   find_inferior_id (&all_threads, \
  85                                   get_process (proc)->lwpid))
  86
  87 struct process_info
  88 {
  89   struct inferior_list_entry head;
  90   unsigned long lwpid;
  91
  92   /* If this flag is set, the next SIGSTOP will be ignored (the
  93      process will be immediately resumed).  This means that either we
  94      sent the SIGSTOP to it ourselves and got some other pending event
  95      (so the SIGSTOP is still pending), or that we stopped the
  96      inferior implicitly via PTRACE_ATTACH and have not waited for it
  97      yet.  */
  98   int stop_expected;
  99
 100   /* If this flag is set, the process is known to be stopped right now (stop
 101      event already received in a wait()).  */
 102   int stopped;
 103
 104   /* When stopped is set, the last wait status recorded for this process.  */
 105   int last_status;
 106
 107   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 108      been reported.  */
 109   int status_pending_p;
 110   int status_pending;
 111
 112   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 113   int pending_is_breakpoint;
 114   CORE_ADDR pending_stop_pc;
 115
 116   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 117      stop (SIGTRAP stops only).  */
 118   CORE_ADDR bp_reinsert;
 119
 120   /* If this flag is set, the last continue operation on this process
 121      was a single-step.  */
 122   int stepping;
 123
 124   /* If this is non-zero, it points to a chain of signals which need to
 125      be delivered to this process.  */
 126   struct pending_signals *pending_signals;
 127
 128   /* A link used when resuming.  It is initialized from the resume request,
 129      and then processed and cleared in linux_resume_one_process.  */
 130
 131   struct thread_resume *resume;
 132
 133   int thread_known;
 134 #ifdef HAVE_THREAD_DB_H
 135   /* The thread handle, used for e.g. TLS access.  Only valid if
 136      THREAD_KNOWN is set.  */
 137   td_thrhandle_t th;
 138 #endif
 139 };
 140
 141 extern struct inferior_list all_processes;
 142
 143 void linux_attach_lwp (unsigned long pid);
 144
 145 int thread_db_init (int use_events);
 146 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 147                                CORE_ADDR load_module, CORE_ADDR *address);