gdb/fbsd-nat.h

   1 /* Native-dependent code for FreeBSD.
   2
   3    Copyright (C) 2004-2022 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 #ifndef FBSD_NAT_H
  21 #define FBSD_NAT_H
  22
  23 #include "inf-ptrace.h"
  24 #include "regcache.h"
  25 #include "regset.h"
  26 #include <osreldate.h>
  27 #include <sys/proc.h>
  28
  29 /* FreeBSD kernels 11.3 and later report valid si_code values for
  30    SIGTRAP on all architectures.  Older FreeBSD kernels that supported
  31    TRAP_BRKPT did not report valid values for MIPS and sparc64.  Even
  32    older kernels without TRAP_BRKPT support did not report valid
  33    values on any architecture.  */
  34 #if (__FreeBSD_kernel_version >= 1102502) || (__FreeBSD_version >= 1102502)
  35 # define USE_SIGTRAP_SIGINFO
  36 #elif defined(TRAP_BRKPT)
  37 # if !defined(__mips__) && !defined(__sparc64__)
  38 #  define USE_SIGTRAP_SIGINFO
  39 # endif
  40 #endif
  41
  42 /* A prototype FreeBSD target.  */
  43
  44 class fbsd_nat_target : public inf_ptrace_target
  45 {
  46 public:
  47   const char *pid_to_exec_file (int pid) override;
  48
  49   int find_memory_regions (find_memory_region_ftype func, void *data) override;
  50
  51   bool info_proc (const char *, enum info_proc_what) override;
  52
  53   enum target_xfer_status xfer_partial (enum target_object object,
  54                                         const char *annex,
  55                                         gdb_byte *readbuf,
  56                                         const gdb_byte *writebuf,
  57                                         ULONGEST offset, ULONGEST len,
  58                                         ULONGEST *xfered_len) override;
  59
  60   bool thread_alive (ptid_t ptid) override;
  61   std::string pid_to_str (ptid_t) override;
  62
  63 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
  64   const char *thread_name (struct thread_info *) override;
  65 #endif
  66
  67   void update_thread_list () override;
  68
  69   bool can_async_p () override;
  70
  71   void async (bool) override;
  72
  73   thread_control_capabilities get_thread_control_capabilities () override
  74   { return tc_schedlock; }
  75
  76   void create_inferior (const char *, const std::string &,
  77                         char **, int) override;
  78
  79   void resume (ptid_t, int, enum gdb_signal) override;
  80
  81   ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
  82
  83   void post_attach (int) override;
  84
  85 #ifdef USE_SIGTRAP_SIGINFO
  86   bool supports_stopped_by_sw_breakpoint () override;
  87   bool stopped_by_sw_breakpoint () override;
  88 #endif
  89
  90 #ifdef TDP_RFPPWAIT
  91   void follow_fork (inferior *, ptid_t, target_waitkind, bool, bool) override;
  92
  93   int insert_fork_catchpoint (int) override;
  94   int remove_fork_catchpoint (int) override;
  95
  96   int insert_vfork_catchpoint (int) override;
  97   int remove_vfork_catchpoint (int) override;
  98 #endif
  99
 100   int insert_exec_catchpoint (int) override;
 101   int remove_exec_catchpoint (int) override;
 102
 103 #ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
 104   int set_syscall_catchpoint (int, bool, int, gdb::array_view<const int>)
 105     override;
 106 #endif
 107
 108   bool supports_multi_process () override;
 109
 110   bool supports_disable_randomization () override;
 111
 112   /* Methods meant to be overridden by arch-specific target
 113      classes.  */
 114
 115   virtual void low_new_fork (ptid_t parent, pid_t child)
 116   {}
 117
 118   /* The method to call, if any, when a thread is destroyed.  */
 119   virtual void low_delete_thread (thread_info *)
 120   {}
 121
 122   /* Hook to call prior to resuming a thread.  */
 123   virtual void low_prepare_to_resume (thread_info *)
 124   {}
 125
 126 protected:
 127
 128   void post_startup_inferior (ptid_t) override;
 129
 130 private:
 131   ptid_t wait_1 (ptid_t, struct target_waitstatus *, target_wait_flags);
 132
 133   /* Helper routines for use in fetch_registers and store_registers in
 134      subclasses.  These routines fetch and store a single set of
 135      registers described by REGSET.  The REGSET's 'regmap' field must
 136      point to an array of 'struct regcache_map_entry'.
 137
 138      FETCH_OP is a ptrace operation to fetch the set of registers from
 139      a native thread.  STORE_OP is a ptrace operation to store the set
 140      of registers to a native thread.
 141
 142      The caller must provide storage for the set of registers in REGS,
 143      and SIZE is the size of the storage.
 144
 145      Returns true if the register set was transferred due to a
 146      matching REGNUM.*/
 147
 148   bool fetch_register_set (struct regcache *regcache, int regnum, int fetch_op,
 149                            const struct regset *regset, void *regs, size_t size);
 150
 151   bool store_register_set (struct regcache *regcache, int regnum, int fetch_op,
 152                            int store_op, const struct regset *regset,
 153                            void *regs, size_t size);
 154
 155   /* Helper routines which use PT_GETREGSET and PT_SETREGSET for the
 156      specified NOTE instead of regset-specific fetch and store
 157      ops.  */
 158
 159   bool fetch_regset (struct regcache *regcache, int regnum, int note,
 160                      const struct regset *regset, void *regs, size_t size);
 161
 162   bool store_regset (struct regcache *regcache, int regnum, int note,
 163                      const struct regset *regset, void *regs, size_t size);
 164
 165 protected:
 166   /* Wrapper versions of the above helpers which accept a register set
 167      type such as 'struct reg' or 'struct fpreg'.  */
 168
 169   template <class Regset>
 170   bool fetch_register_set (struct regcache *regcache, int regnum, int fetch_op,
 171                            const struct regset *regset)
 172   {
 173     Regset regs;
 174     return fetch_register_set (regcache, regnum, fetch_op, regset, &regs,
 175                                sizeof (regs));
 176   }
 177
 178   template <class Regset>
 179   bool store_register_set (struct regcache *regcache, int regnum, int fetch_op,
 180                            int store_op, const struct regset *regset)
 181   {
 182     Regset regs;
 183     return store_register_set (regcache, regnum, fetch_op, store_op, regset,
 184                                &regs, sizeof (regs));
 185   }
 186
 187   /* Helper routine for use in read_description in subclasses.  This
 188      routine checks if the register set for the specified NOTE is
 189      present for a given PTID.  If the register set is present, the
 190      the size of the register set is returned.  If the register set is
 191      not present, zero is returned.  */
 192
 193   size_t have_regset (ptid_t ptid, int note);
 194
 195   /* Wrapper versions of the PT_GETREGSET and PT_REGSET helpers which
 196      accept a register set type.  */
 197
 198   template <class Regset>
 199   bool fetch_regset (struct regcache *regcache, int regnum, int note,
 200                      const struct regset *regset)
 201   {
 202     Regset regs;
 203     return fetch_regset (regcache, regnum, note, regset, &regs, sizeof (regs));
 204   }
 205
 206   template <class Regset>
 207   bool store_regset (struct regcache *regcache, int regnum, int note,
 208                      const struct regset *regset)
 209   {
 210     Regset regs;
 211     return store_regset (regcache, regnum, note, regset, &regs, sizeof (regs));
 212   }
 213 };
 214
 215 /* Fetch the signal information for PTID and store it in *SIGINFO.
 216    Return true if successful.  */
 217 bool fbsd_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
 218
 219 #endif /* fbsd-nat.h */