gdbserver/tracepoint.h

   1 /* Tracepoint code for remote server for GDB.
   2    Copyright (C) 1993-2024 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 3 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, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef GDBSERVER_TRACEPOINT_H
  20 #define GDBSERVER_TRACEPOINT_H
  21
  22 /* Size for a small buffer to report problems from the in-process
  23    agent back to GDBserver.  */
  24 #define IPA_BUFSIZ 100
  25
  26 void initialize_tracepoint (void);
  27
  28 #if defined(__GNUC__)
  29 # define ATTR_USED __attribute__((used))
  30 # define ATTR_NOINLINE __attribute__((noinline))
  31 #else
  32 # define ATTR_USED
  33 # define ATTR_NOINLINE
  34 #endif
  35
  36 /* How to make symbol public/exported.  */
  37
  38 #if defined _WIN32 || defined __CYGWIN__
  39 # define EXPORTED_SYMBOL __declspec (dllexport)
  40 #else
  41 # define EXPORTED_SYMBOL __attribute__ ((visibility ("default")))
  42 #endif
  43
  44 /* Use these to make sure the functions and variables the IPA needs to
  45    export (symbols GDBserver needs to query GDB about) are visible and
  46    have C linkage.
  47
  48    Tag exported functions with IP_AGENT_EXPORT_FUNC, tag the
  49    definitions of exported variables with IP_AGENT_EXPORT_VAR, and
  50    variable declarations with IP_AGENT_EXPORT_VAR_DECL.  Variables
  51    must also be exported with C linkage.  As we can't both use extern
  52    "C" and initialize a variable in the same statement, variables that
  53    don't have a separate declaration must use
  54    extern "C" {...} around their definition.  */
  55
  56 #ifdef IN_PROCESS_AGENT
  57 # define IP_AGENT_EXPORT_FUNC extern "C" EXPORTED_SYMBOL ATTR_NOINLINE ATTR_USED
  58 # define IP_AGENT_EXPORT_VAR EXPORTED_SYMBOL ATTR_USED
  59 # define IP_AGENT_EXPORT_VAR_DECL extern "C" EXPORTED_SYMBOL
  60 #else
  61 # define IP_AGENT_EXPORT_FUNC static
  62 # define IP_AGENT_EXPORT_VAR
  63 # define IP_AGENT_EXPORT_VAR_DECL extern
  64 #endif
  65
  66 IP_AGENT_EXPORT_VAR_DECL int tracing;
  67
  68 extern int disconnected_tracing;
  69
  70 void tracepoint_look_up_symbols (void);
  71
  72 void stop_tracing (void);
  73
  74 int handle_tracepoint_general_set (char *own_buf);
  75 int handle_tracepoint_query (char *own_buf);
  76
  77 int tracepoint_finished_step (thread_info *tinfo, CORE_ADDR stop_pc);
  78 int tracepoint_was_hit (thread_info *tinfo, CORE_ADDR stop_pc);
  79
  80 void release_while_stepping_state_list (thread_info *tinfo);
  81
  82 int in_readonly_region (CORE_ADDR addr, ULONGEST length);
  83 int traceframe_read_mem (int tfnum, CORE_ADDR addr,
  84                          unsigned char *buf, ULONGEST length,
  85                          ULONGEST *nbytes);
  86 int fetch_traceframe_registers (int tfnum,
  87                                 struct regcache *regcache,
  88                                 int regnum);
  89
  90 int traceframe_read_info (int tfnum, std::string *buffer);
  91
  92 /* If a thread is determined to be collecting a fast tracepoint, this
  93    structure holds the collect status.  */
  94
  95 struct fast_tpoint_collect_status
  96 {
  97   /* The tracepoint that is presently being collected.  */
  98   int tpoint_num;
  99   CORE_ADDR tpoint_addr;
 100
 101   /* The address range in the jump pad of where the original
 102      instruction the tracepoint jump was inserted was relocated
 103      to.  */
 104   CORE_ADDR adjusted_insn_addr;
 105   CORE_ADDR adjusted_insn_addr_end;
 106 };
 107
 108 /* The possible states a thread can be in, related to the collection of fast
 109    tracepoint.  */
 110
 111 enum class fast_tpoint_collect_result
 112 {
 113   /* Not collecting a fast tracepoint.  */
 114   not_collecting,
 115
 116   /* In the jump pad, but before the relocated instruction.  */
 117   before_insn,
 118
 119   /* In the jump pad, but at (or after) the relocated instruction.  */
 120   at_insn,
 121 };
 122
 123 fast_tpoint_collect_result fast_tracepoint_collecting
 124   (CORE_ADDR thread_area, CORE_ADDR stop_pc,
 125    struct fast_tpoint_collect_status *status);
 126
 127 void force_unlock_trace_buffer (void);
 128
 129 int handle_tracepoint_bkpts (thread_info *tinfo, CORE_ADDR stop_pc);
 130
 131 #ifdef IN_PROCESS_AGENT
 132 void initialize_low_tracepoint (void);
 133 const struct target_desc *get_ipa_tdesc (int idx);
 134 void supply_fast_tracepoint_registers (struct regcache *regcache,
 135                                        const unsigned char *regs);
 136 void supply_static_tracepoint_registers (struct regcache *regcache,
 137                                          const unsigned char *regs,
 138                                          CORE_ADDR pc);
 139 void set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end,
 140                                   char *errmsg);
 141 void *alloc_jump_pad_buffer (size_t size);
 142 #ifndef HAVE_GETAUXVAL
 143 unsigned long getauxval (unsigned long type);
 144 #endif
 145 #else
 146 void stop_tracing (void);
 147
 148 int claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline);
 149 int have_fast_tracepoint_trampoline_buffer (char *msgbuf);
 150 void gdb_agent_about_to_close (int pid);
 151 #endif
 152
 153 struct traceframe;
 154 struct eval_agent_expr_context;
 155
 156 /* When TO is not NULL, do memory copies for bytecodes, read LEN bytes
 157    starting at address FROM, and place the result in the buffer TO.
 158    Return 0 on success, otherwise a non-zero error code.
 159
 160    When TO is NULL, do the recording of memory blocks for actions and
 161    bytecodes into a new traceframe block.  Return 0 on success, otherwise,
 162    return 1 if there is an error.  */
 163
 164 int agent_mem_read (struct eval_agent_expr_context *ctx,
 165                     unsigned char *to, CORE_ADDR from,
 166                     ULONGEST len);
 167
 168 LONGEST agent_get_trace_state_variable_value (int num);
 169 void agent_set_trace_state_variable_value (int num, LONGEST val);
 170
 171 /* Record the value of a trace state variable.  */
 172
 173 int agent_tsv_read (struct eval_agent_expr_context *ctx, int n);
 174 int agent_mem_read_string (struct eval_agent_expr_context *ctx,
 175                            unsigned char *to,
 176                            CORE_ADDR from,
 177                            ULONGEST len);
 178
 179 /* The prototype the get_raw_reg function in the IPA.  Each arch's
 180    bytecode compiler emits calls to this function.  */
 181 ULONGEST get_raw_reg (const unsigned char *raw_regs, int regnum);
 182
 183 /* Returns the address of the get_raw_reg function in the IPA.  */
 184 CORE_ADDR get_raw_reg_func_addr (void);
 185 /* Returns the address of the get_trace_state_variable_value
 186    function in the IPA.  */
 187 CORE_ADDR get_get_tsv_func_addr (void);
 188 /* Returns the address of the set_trace_state_variable_value
 189    function in the IPA.  */
 190 CORE_ADDR get_set_tsv_func_addr (void);
 191
 192 #endif /* GDBSERVER_TRACEPOINT_H */