gdb/gdbserver/linux-low.h

   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 2 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, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #ifdef HAVE_THREAD_DB_H
  22 #include <thread_db.h>
  23 #endif
  24
  25 #ifdef HAVE_LINUX_REGSETS
  26 typedef void (*regset_fill_func) (void *);
  27 typedef void (*regset_store_func) (const void *);
  28 enum regset_type {
  29   GENERAL_REGS,
  30   FP_REGS,
  31   EXTENDED_REGS,
  32 };
  33
  34 struct regset_info
  35 {
  36   int get_request, set_request;
  37   int size;
  38   enum regset_type type;
  39   regset_fill_func fill_function;
  40   regset_store_func store_function;
  41 };
  42 extern struct regset_info target_regsets[];
  43 #endif
  44
  45 struct linux_target_ops
  46 {
  47   int num_regs;
  48   int *regmap;
  49   int (*cannot_fetch_register) (int);
  50
  51   /* Returns 0 if we can store the register, 1 if we can not
  52      store the register, and 2 if failure to store the register
  53      is acceptable.  */
  54   int (*cannot_store_register) (int);
  55   CORE_ADDR (*get_pc) (void);
  56   void (*set_pc) (CORE_ADDR newpc);
  57   const unsigned char *breakpoint;
  58   int breakpoint_len;
  59   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  60
  61
  62   int decr_pc_after_break;
  63   int (*breakpoint_at) (CORE_ADDR pc);
  64
  65   /* Watchpoint related functions.  See target.h for comments.  */
  66   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  67   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  68   int (*stopped_by_watchpoint) (void);
  69   CORE_ADDR (*stopped_data_address) (void);
  70
  71   /* Whether to left-pad registers for PEEKUSR/POKEUSR if they are smaller
  72      than an xfer unit.  */
  73   int left_pad_xfer;
  74
  75   /* What string to report to GDB when it asks for the architecture,
  76      or NULL not to answer.  */
  77   const char *arch_string;
  78 };
  79
  80 extern struct linux_target_ops the_low_target;
  81
  82 #define get_process(inf) ((struct process_info *)(inf))
  83 #define get_thread_process(thr) (get_process (inferior_target_data (thr)))
  84 #define get_process_thread(proc) ((struct thread_info *) \
  85                                   find_inferior_id (&all_threads, \
  86                                   get_process (proc)->tid))
  87
  88 struct process_info
  89 {
  90   struct inferior_list_entry head;
  91   int thread_known;
  92   unsigned long lwpid;
  93   unsigned long tid;
  94
  95   /* If this flag is set, the next SIGSTOP will be ignored (the
  96      process will be immediately resumed).  This means that either we
  97      sent the SIGSTOP to it ourselves and got some other pending event
  98      (so the SIGSTOP is still pending), or that we stopped the
  99      inferior implicitly via PTRACE_ATTACH and have not waited for it
 100      yet.  */
 101   int stop_expected;
 102
 103   /* If this flag is set, the process is known to be stopped right now (stop
 104      event already received in a wait()).  */
 105   int stopped;
 106
 107   /* When stopped is set, the last wait status recorded for this process.  */
 108   int last_status;
 109
 110   /* If this flag is set, we have sent a SIGSTOP to this process and are
 111      waiting for it to stop.  */
 112   int sigstop_sent;
 113
 114   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 115      been reported.  */
 116   int status_pending_p;
 117   int status_pending;
 118
 119   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 120   int pending_is_breakpoint;
 121   CORE_ADDR pending_stop_pc;
 122
 123   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 124      stop (SIGTRAP stops only).  */
 125   CORE_ADDR bp_reinsert;
 126
 127   /* If this flag is set, the last continue operation on this process
 128      was a single-step.  */
 129   int stepping;
 130
 131   /* If this is non-zero, it points to a chain of signals which need to
 132      be delivered to this process.  */
 133   struct pending_signals *pending_signals;
 134
 135   /* A link used when resuming.  It is initialized from the resume request,
 136      and then processed and cleared in linux_resume_one_process.  */
 137
 138   struct thread_resume *resume;
 139
 140 #ifdef HAVE_THREAD_DB_H
 141   /* The thread handle, used for e.g. TLS access.  */
 142   td_thrhandle_t th;
 143 #endif
 144 };
 145
 146 extern struct inferior_list all_processes;
 147
 148 void linux_attach_lwp (unsigned long pid, unsigned long tid);
 149
 150 int thread_db_init (void);
 151 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 152                                CORE_ADDR load_module, CORE_ADDR *address);