gdb/darwin-nat.h

   1 /* Common things used by the various darwin files
   2    Copyright (C) 1995-2022 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 struct darwin_exception_msg
  25 {
  26   mach_msg_header_t header;
  27
  28   /* Thread and task taking the exception.  */
  29   mach_port_t thread_port;
  30   mach_port_t task_port;
  31
  32   /* Type of the exception.  */
  33   exception_type_t ex_type;
  34
  35   /* Machine dependent details.  */
  36   mach_msg_type_number_t data_count;
  37   integer_t ex_data[2];
  38 };
  39
  40 enum darwin_msg_state
  41 {
  42   /* The thread is running.  */
  43   DARWIN_RUNNING,
  44
  45   /* The thread is stopped.  */
  46   DARWIN_STOPPED,
  47
  48   /* The thread has sent a message and waits for a reply.  */
  49   DARWIN_MESSAGE
  50 };
  51
  52 struct darwin_thread_info : public private_thread_info
  53 {
  54   /* The thread port from a GDB point of view.  */
  55   thread_t gdb_port = 0;
  56
  57   /* The thread port from the inferior point of view.  Not to be used inside
  58      gdb except for get_ada_task_ptid.  */
  59   thread_t inf_port = 0;
  60
  61   /* Current message state.
  62      If the kernel has sent a message it expects a reply and the inferior
  63      can't be killed before.  */
  64   enum darwin_msg_state msg_state = DARWIN_RUNNING;
  65
  66   /* True if this thread is single-stepped.  */
  67   bool single_step = false;
  68
  69   /* True if a signal was manually sent to the thread.  */
  70   bool signaled = false;
  71
  72   /* The last exception received.  */
  73   struct darwin_exception_msg event {};
  74 };
  75 typedef struct darwin_thread_info darwin_thread_t;
  76
  77 /* This needs to be overridden by the platform specific nat code.  */
  78
  79 class darwin_nat_target : public inf_child_target
  80 {
  81   void create_inferior (const char *exec_file,
  82                         const std::string &allargs,
  83                         char **env, int from_tty) override;
  84
  85   void attach (const char *, int) override;
  86
  87   void detach (inferior *, int) override;
  88
  89   ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
  90
  91   void mourn_inferior () override;
  92
  93   void kill () override;
  94
  95   void interrupt () override;
  96
  97   void resume (ptid_t, int , enum gdb_signal) override;
  98
  99   bool thread_alive (ptid_t ptid) override;
 100
 101   std::string pid_to_str (ptid_t) override;
 102
 103   const char *pid_to_exec_file (int pid) override;
 104
 105   enum target_xfer_status xfer_partial (enum target_object object,
 106                                         const char *annex,
 107                                         gdb_byte *readbuf,
 108                                         const gdb_byte *writebuf,
 109                                         ULONGEST offset, ULONGEST len,
 110                                         ULONGEST *xfered_len) override;
 111
 112   bool supports_multi_process () override;
 113
 114   ptid_t get_ada_task_ptid (long lwp, ULONGEST thread) override;
 115
 116 private:
 117   ptid_t wait_1 (ptid_t, struct target_waitstatus *);
 118   void check_new_threads (inferior *inf);
 119   int decode_exception_message (mach_msg_header_t *hdr,
 120                                 inferior **pinf,
 121                                 darwin_thread_t **pthread);
 122   ptid_t decode_message (mach_msg_header_t *hdr,
 123                          darwin_thread_t **pthread,
 124                          inferior **pinf,
 125                          target_waitstatus *status);
 126   void stop_inferior (inferior *inf);
 127   void init_thread_list (inferior *inf);
 128   void ptrace_him (int pid);
 129   int cancel_breakpoint (ptid_t ptid);
 130 };
 131
 132 /* Describe the mach exception handling state for a task.  This state is saved
 133    before being changed and restored when a process is detached.
 134    For more information on these fields see task_get_exception_ports manual
 135    page.  */
 136 struct darwin_exception_info
 137 {
 138   /* Exceptions handled by the port.  */
 139   exception_mask_t masks[EXC_TYPES_COUNT] {};
 140
 141   /* Ports receiving exception messages.  */
 142   mach_port_t ports[EXC_TYPES_COUNT] {};
 143
 144   /* Type of messages sent.  */
 145   exception_behavior_t behaviors[EXC_TYPES_COUNT] {};
 146
 147   /* Type of state to be sent.  */
 148   thread_state_flavor_t flavors[EXC_TYPES_COUNT] {};
 149
 150   /* Number of elements set.  */
 151   mach_msg_type_number_t count = 0;
 152 };
 153
 154 static inline darwin_thread_info *
 155 get_darwin_thread_info (class thread_info *thread)
 156 {
 157   return static_cast<darwin_thread_info *> (thread->priv.get ());
 158 }
 159
 160 /* Describe an inferior.  */
 161 struct darwin_inferior : public private_inferior
 162 {
 163   /* Corresponding task port.  */
 164   task_t task = 0;
 165
 166   /* Port which will receive the dead-name notification for the task port.
 167      This is used to detect the death of the task.  */
 168   mach_port_t notify_port = 0;
 169
 170   /* Initial exception handling.  */
 171   darwin_exception_info exception_info;
 172
 173   /* Number of messages that have been received but not yet replied.  */
 174   unsigned int pending_messages = 0;
 175
 176   /* Set if inferior is not controlled by ptrace(2) but through Mach.  */
 177   bool no_ptrace = false;
 178
 179   /* True if this task is suspended.  */
 180   bool suspended = false;
 181
 182   /* Sorted vector of known threads.  */
 183   std::vector<darwin_thread_t *> threads;
 184 };
 185
 186 /* Return the darwin_inferior attached to INF.  */
 187
 188 static inline darwin_inferior *
 189 get_darwin_inferior (inferior *inf)
 190 {
 191   return static_cast<darwin_inferior *> (inf->priv.get ());
 192 }
 193
 194 /* Exception port.  */
 195 extern mach_port_t darwin_ex_port;
 196
 197 /* Port set.  */
 198 extern mach_port_t darwin_port_set;
 199
 200 /* A copy of mach_host_self ().  */
 201 extern mach_port_t darwin_host_self;
 202
 203 #define MACH_CHECK_ERROR(ret) \
 204   mach_check_error (ret, __FILE__, __LINE__, __func__)
 205
 206 extern void mach_check_error (kern_return_t ret, const char *file,
 207                               unsigned int line, const char *func);
 208
 209 void darwin_set_sstep (thread_t thread, int enable);
 210
 211 void darwin_check_osabi (darwin_inferior *inf, thread_t thread);
 212
 213 #endif /* DARWIN_NAT_H */