gdb/darwin-nat.h

   1 /* Common things used by the various darwin files
   2    Copyright (C) 1995-2019 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #ifndef DARWIN_NAT_H
  18 #define DARWIN_NAT_H
  19
  20 #include "inf-child.h"
  21 #include <mach/mach.h>
  22 #include "gdbthread.h"
  23
  24 /* This needs to be overridden by the platform specific nat code.  */
  25
  26 class darwin_nat_target : public inf_child_target
  27 {
  28   void create_inferior (const char *exec_file,
  29                         const std::string &allargs,
  30                         char **env, int from_tty) override;
  31
  32   void attach (const char *, int) override;
  33
  34   void detach (inferior *, int) override;
  35
  36   ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
  37
  38   void mourn_inferior () override;
  39
  40   void kill () override;
  41
  42   void interrupt () override;
  43
  44   void resume (ptid_t, int , enum gdb_signal) override;
  45
  46   bool thread_alive (ptid_t ptid) override;
  47
  48   std::string pid_to_str (ptid_t) override;
  49
  50   char *pid_to_exec_file (int pid) override;
  51
  52   enum target_xfer_status xfer_partial (enum target_object object,
  53                                         const char *annex,
  54                                         gdb_byte *readbuf,
  55                                         const gdb_byte *writebuf,
  56                                         ULONGEST offset, ULONGEST len,
  57                                         ULONGEST *xfered_len) override;
  58
  59   bool supports_multi_process () override;
  60
  61   ptid_t get_ada_task_ptid (long lwp, long thread) override;
  62 };
  63
  64 /* Describe the mach exception handling state for a task.  This state is saved
  65    before being changed and restored when a process is detached.
  66    For more information on these fields see task_get_exception_ports manual
  67    page.  */
  68 struct darwin_exception_info
  69 {
  70   /* Exceptions handled by the port.  */
  71   exception_mask_t masks[EXC_TYPES_COUNT] {};
  72
  73   /* Ports receiving exception messages.  */
  74   mach_port_t ports[EXC_TYPES_COUNT] {};
  75
  76   /* Type of messages sent.  */
  77   exception_behavior_t behaviors[EXC_TYPES_COUNT] {};
  78
  79   /* Type of state to be sent.  */
  80   thread_state_flavor_t flavors[EXC_TYPES_COUNT] {};
  81
  82   /* Number of elements set.  */
  83   mach_msg_type_number_t count = 0;
  84 };
  85
  86 struct darwin_exception_msg
  87 {
  88   mach_msg_header_t header;
  89
  90   /* Thread and task taking the exception.  */
  91   mach_port_t thread_port;
  92   mach_port_t task_port;
  93
  94   /* Type of the exception.  */
  95   exception_type_t ex_type;
  96
  97   /* Machine dependent details.  */
  98   mach_msg_type_number_t data_count;
  99   integer_t ex_data[2];
 100 };
 101
 102 enum darwin_msg_state
 103 {
 104   /* The thread is running.  */
 105   DARWIN_RUNNING,
 106
 107   /* The thread is stopped.  */
 108   DARWIN_STOPPED,
 109
 110   /* The thread has sent a message and waits for a reply.  */
 111   DARWIN_MESSAGE
 112 };
 113
 114 struct darwin_thread_info : public private_thread_info
 115 {
 116   /* The thread port from a GDB point of view.  */
 117   thread_t gdb_port = 0;
 118
 119   /* The thread port from the inferior point of view.  Not to be used inside
 120      gdb except for get_ada_task_ptid.  */
 121   thread_t inf_port = 0;
 122
 123   /* Current message state.
 124      If the kernel has sent a message it expects a reply and the inferior
 125      can't be killed before.  */
 126   enum darwin_msg_state msg_state = DARWIN_RUNNING;
 127
 128   /* True if this thread is single-stepped.  */
 129   bool single_step = false;
 130
 131   /* True if a signal was manually sent to the thread.  */
 132   bool signaled = false;
 133
 134   /* The last exception received.  */
 135   struct darwin_exception_msg event {};
 136 };
 137 typedef struct darwin_thread_info darwin_thread_t;
 138
 139 static inline darwin_thread_info *
 140 get_darwin_thread_info (class thread_info *thread)
 141 {
 142   return static_cast<darwin_thread_info *> (thread->priv.get ());
 143 }
 144
 145 /* Describe an inferior.  */
 146 struct darwin_inferior : public private_inferior
 147 {
 148   /* Corresponding task port.  */
 149   task_t task = 0;
 150
 151   /* Port which will receive the dead-name notification for the task port.
 152      This is used to detect the death of the task.  */
 153   mach_port_t notify_port = 0;
 154
 155   /* Initial exception handling.  */
 156   darwin_exception_info exception_info;
 157
 158   /* Number of messages that have been received but not yet replied.  */
 159   unsigned int pending_messages = 0;
 160
 161   /* Set if inferior is not controlled by ptrace(2) but through Mach.  */
 162   bool no_ptrace = false;
 163
 164   /* True if this task is suspended.  */
 165   bool suspended = false;
 166
 167   /* Sorted vector of known threads.  */
 168   std::vector<darwin_thread_t *> threads;
 169 };
 170
 171 /* Return the darwin_inferior attached to INF.  */
 172
 173 static inline darwin_inferior *
 174 get_darwin_inferior (inferior *inf)
 175 {
 176   return static_cast<darwin_inferior *> (inf->priv.get ());
 177 }
 178
 179 /* Exception port.  */
 180 extern mach_port_t darwin_ex_port;
 181
 182 /* Port set.  */
 183 extern mach_port_t darwin_port_set;
 184
 185 /* A copy of mach_host_self ().  */
 186 extern mach_port_t darwin_host_self;
 187
 188 /* FUNCTION_NAME is defined in common-utils.h (or not).  */
 189 #ifdef FUNCTION_NAME
 190 #define MACH_CHECK_ERROR(ret) \
 191   mach_check_error (ret, __FILE__, __LINE__, FUNCTION_NAME)
 192 #else
 193 #define MACH_CHECK_ERROR(ret) \
 194   mach_check_error (ret, __FILE__, __LINE__, "??")
 195 #endif
 196
 197 extern void mach_check_error (kern_return_t ret, const char *file,
 198                               unsigned int line, const char *func);
 199
 200 void darwin_set_sstep (thread_t thread, int enable);
 201
 202 void darwin_check_osabi (darwin_inferior *inf, thread_t thread);
 203
 204 #endif /* DARWIN_NAT_H */