gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004-2005, 2007-2012 Free Software Foundation,
   3    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 #include "gdb_proc_service.h"
  25
  26 #ifdef HAVE_LINUX_REGSETS
  27 typedef void (*regset_fill_func) (struct regcache *, void *);
  28 typedef void (*regset_store_func) (struct regcache *, const void *);
  29 enum regset_type {
  30   GENERAL_REGS,
  31   FP_REGS,
  32   EXTENDED_REGS,
  33 };
  34
  35 struct regset_info
  36 {
  37   int get_request, set_request;
  38   /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
  39      argument and the 4th argument should be "const struct iovec *".  */
  40   int nt_type;
  41   int size;
  42   enum regset_type type;
  43   regset_fill_func fill_function;
  44   regset_store_func store_function;
  45 };
  46 extern struct regset_info target_regsets[];
  47 #endif
  48
  49 struct siginfo;
  50
  51 struct process_info_private
  52 {
  53   /* Arch-specific additions.  */
  54   struct arch_process_info *arch_private;
  55
  56   /* libthread_db-specific additions.  Not NULL if this process has loaded
  57      thread_db, and it is active.  */
  58   struct thread_db *thread_db;
  59
  60   /* &_r_debug.  0 if not yet determined.  -1 if no PT_DYNAMIC in Phdrs.  */
  61   CORE_ADDR r_debug;
  62 };
  63
  64 struct lwp_info;
  65
  66 struct linux_target_ops
  67 {
  68   /* Architecture-specific setup.  */
  69   void (*arch_setup) (void);
  70
  71   int num_regs;
  72   int *regmap;
  73
  74   /* Regset support bitmap: 1 for registers that are transferred as a part
  75      of a regset, 0 for ones that need to be handled individually.  This
  76      can be NULL if all registers are transferred with regsets or regsets
  77      are not supported.  */
  78   unsigned char *regset_bitmap;
  79   int (*cannot_fetch_register) (int);
  80
  81   /* Returns 0 if we can store the register, 1 if we can not
  82      store the register, and 2 if failure to store the register
  83      is acceptable.  */
  84   int (*cannot_store_register) (int);
  85   CORE_ADDR (*get_pc) (struct regcache *regcache);
  86   void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
  87   const unsigned char *breakpoint;
  88   int breakpoint_len;
  89   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  90
  91   int decr_pc_after_break;
  92   int (*breakpoint_at) (CORE_ADDR pc);
  93
  94   /* Breakpoint and watchpoint related functions.  See target.h for
  95      comments.  */
  96   int (*insert_point) (char type, CORE_ADDR addr, int len);
  97   int (*remove_point) (char type, CORE_ADDR addr, int len);
  98   int (*stopped_by_watchpoint) (void);
  99   CORE_ADDR (*stopped_data_address) (void);
 100
 101   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
 102      for registers smaller than an xfer unit).  */
 103   void (*collect_ptrace_register) (struct regcache *regcache,
 104                                    int regno, char *buf);
 105   void (*supply_ptrace_register) (struct regcache *regcache,
 106                                   int regno, const char *buf);
 107
 108   /* Hook to convert from target format to ptrace format and back.
 109      Returns true if any conversion was done; false otherwise.
 110      If DIRECTION is 1, then copy from INF to NATIVE.
 111      If DIRECTION is 0, copy from NATIVE to INF.  */
 112   int (*siginfo_fixup) (struct siginfo *native, void *inf, int direction);
 113
 114   /* Hook to call when a new process is created or attached to.
 115      If extra per-process architecture-specific data is needed,
 116      allocate it here.  */
 117   struct arch_process_info * (*new_process) (void);
 118
 119   /* Hook to call when a new thread is detected.
 120      If extra per-thread architecture-specific data is needed,
 121      allocate it here.  */
 122   struct arch_lwp_info * (*new_thread) (void);
 123
 124   /* Hook to call prior to resuming a thread.  */
 125   void (*prepare_to_resume) (struct lwp_info *);
 126
 127   /* Hook to support target specific qSupported.  */
 128   void (*process_qsupported) (const char *);
 129
 130   /* Returns true if the low target supports tracepoints.  */
 131   int (*supports_tracepoints) (void);
 132
 133   /* Fill ADDRP with the thread area address of LWPID.  Returns 0 on
 134      success, -1 on failure.  */
 135   int (*get_thread_area) (int lwpid, CORE_ADDR *addrp);
 136
 137   /* Install a fast tracepoint jump pad.  See target.h for
 138      comments.  */
 139   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 140                                            CORE_ADDR collector,
 141                                            CORE_ADDR lockaddr,
 142                                            ULONGEST orig_size,
 143                                            CORE_ADDR *jump_entry,
 144                                            CORE_ADDR *trampoline,
 145                                            ULONGEST *trampoline_size,
 146                                            unsigned char *jjump_pad_insn,
 147                                            ULONGEST *jjump_pad_insn_size,
 148                                            CORE_ADDR *adjusted_insn_addr,
 149                                            CORE_ADDR *adjusted_insn_addr_end,
 150                                            char *err);
 151
 152   /* Return the bytecode operations vector for the current inferior.
 153      Returns NULL if bytecode compilation is not supported.  */
 154   struct emit_ops *(*emit_ops) (void);
 155
 156   /* Return the minimum length of an instruction that can be safely overwritten
 157      for use as a fast tracepoint.  */
 158   int (*get_min_fast_tracepoint_insn_len) (void);
 159
 160 };
 161
 162 extern struct linux_target_ops the_low_target;
 163
 164 #define ptid_of(proc) ((proc)->head.id)
 165 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 166 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 167
 168 #define get_lwp(inf) ((struct lwp_info *)(inf))
 169 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 170 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 171                               find_inferior_id (&all_threads,           \
 172                                                 get_lwp (proc)->head.id))
 173
 174 struct lwp_info
 175 {
 176   struct inferior_list_entry head;
 177
 178   /* If this flag is set, the next SIGSTOP will be ignored (the
 179      process will be immediately resumed).  This means that either we
 180      sent the SIGSTOP to it ourselves and got some other pending event
 181      (so the SIGSTOP is still pending), or that we stopped the
 182      inferior implicitly via PTRACE_ATTACH and have not waited for it
 183      yet.  */
 184   int stop_expected;
 185
 186   /* When this is true, we shall not try to resume this thread, even
 187      if last_resume_kind isn't resume_stop.  */
 188   int suspended;
 189
 190   /* If this flag is set, the lwp is known to be stopped right now (stop
 191      event already received in a wait()).  */
 192   int stopped;
 193
 194   /* If this flag is set, the lwp is known to be dead already (exit
 195      event already received in a wait(), and is cached in
 196      status_pending).  */
 197   int dead;
 198
 199   /* When stopped is set, the last wait status recorded for this lwp.  */
 200   int last_status;
 201
 202   /* When stopped is set, this is where the lwp stopped, with
 203      decr_pc_after_break already accounted for.  */
 204   CORE_ADDR stop_pc;
 205
 206   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 207      been reported.  */
 208   int status_pending_p;
 209   int status_pending;
 210
 211   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 212      watchpoint trap.  */
 213   int stopped_by_watchpoint;
 214
 215   /* On architectures where it is possible to know the data address of
 216      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 217      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 218      is true.  */
 219   CORE_ADDR stopped_data_address;
 220
 221   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 222      stop (SIGTRAP stops only).  */
 223   CORE_ADDR bp_reinsert;
 224
 225   /* If this flag is set, the last continue operation at the ptrace
 226      level on this process was a single-step.  */
 227   int stepping;
 228
 229   /* If this flag is set, we need to set the event request flags the
 230      next time we see this LWP stop.  */
 231   int must_set_ptrace_flags;
 232
 233   /* If this is non-zero, it points to a chain of signals which need to
 234      be delivered to this process.  */
 235   struct pending_signals *pending_signals;
 236
 237   /* A link used when resuming.  It is initialized from the resume request,
 238      and then processed and cleared in linux_resume_one_lwp.  */
 239   struct thread_resume *resume;
 240
 241   /* True if it is known that this lwp is presently collecting a fast
 242      tracepoint (it is in the jump pad or in some code that will
 243      return to the jump pad.  Normally, we won't care about this, but
 244      we will if a signal arrives to this lwp while it is
 245      collecting.  */
 246   int collecting_fast_tracepoint;
 247
 248   /* If this is non-zero, it points to a chain of signals which need
 249      to be reported to GDB.  These were deferred because the thread
 250      was doing a fast tracepoint collect when they arrived.  */
 251   struct pending_signals *pending_signals_to_report;
 252
 253   /* When collecting_fast_tracepoint is first found to be 1, we insert
 254      a exit-jump-pad-quickly breakpoint.  This is it.  */
 255   struct breakpoint *exit_jump_pad_bkpt;
 256
 257   /* True if the LWP was seen stop at an internal breakpoint and needs
 258      stepping over later when it is resumed.  */
 259   int need_step_over;
 260
 261   int thread_known;
 262 #ifdef HAVE_THREAD_DB_H
 263   /* The thread handle, used for e.g. TLS access.  Only valid if
 264      THREAD_KNOWN is set.  */
 265   td_thrhandle_t th;
 266 #endif
 267
 268   /* Arch-specific additions.  */
 269   struct arch_lwp_info *arch_private;
 270 };
 271
 272 extern struct inferior_list all_lwps;
 273
 274 int linux_pid_exe_is_elf_64_file (int pid);
 275
 276 void linux_attach_lwp (unsigned long pid);
 277 struct lwp_info *find_lwp_pid (ptid_t ptid);
 278 void linux_stop_lwp (struct lwp_info *lwp);
 279
 280 /* From thread-db.c  */
 281 int thread_db_init (int use_events);
 282 void thread_db_detach (struct process_info *);
 283 void thread_db_mourn (struct process_info *);
 284 int thread_db_handle_monitor_command (char *);
 285 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 286                                CORE_ADDR load_module, CORE_ADDR *address);
 287 int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);