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/* Tracepoint code for remote server for GDB.
Copyright (C) 1993-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef GDBSERVER_TRACEPOINT_H
#define GDBSERVER_TRACEPOINT_H
/* Size for a small buffer to report problems from the in-process
agent back to GDBserver. */
#define IPA_BUFSIZ 100
void initialize_tracepoint (void);
#if defined(__GNUC__)
# define ATTR_USED __attribute__((used))
# define ATTR_NOINLINE __attribute__((noinline))
#else
# define ATTR_USED
# define ATTR_NOINLINE
#endif
/* How to make symbol public/exported. */
#if defined _WIN32 || defined __CYGWIN__
# define EXPORTED_SYMBOL __declspec (dllexport)
#else
# if __GNUC__ >= 4
# define EXPORTED_SYMBOL __attribute__ ((visibility ("default")))
# else
# define EXPORTED_SYMBOL
# endif
#endif
/* Use these to make sure the functions and variables the IPA needs to
export (symbols GDBserver needs to query GDB about) are visible and
have C linkage.
Tag exported functions with IP_AGENT_EXPORT_FUNC, tag the
definitions of exported variables with IP_AGENT_EXPORT_VAR, and
variable declarations with IP_AGENT_EXPORT_VAR_DECL. Variables
must also be exported with C linkage. As we can't both use extern
"C" and initialize a variable in the same statement, variables that
don't have a separate declaration must use
EXTERN_C_PUSH/EXTERN_C_POP around their definition. */
#ifdef IN_PROCESS_AGENT
# define IP_AGENT_EXPORT_FUNC EXTERN_C EXPORTED_SYMBOL ATTR_NOINLINE ATTR_USED
# define IP_AGENT_EXPORT_VAR EXPORTED_SYMBOL ATTR_USED
# define IP_AGENT_EXPORT_VAR_DECL EXTERN_C EXPORTED_SYMBOL
#else
# define IP_AGENT_EXPORT_FUNC static
# define IP_AGENT_EXPORT_VAR
# define IP_AGENT_EXPORT_VAR_DECL extern
#endif
IP_AGENT_EXPORT_VAR_DECL int tracing;
extern int disconnected_tracing;
void tracepoint_look_up_symbols (void);
void stop_tracing (void);
int handle_tracepoint_general_set (char *own_buf);
int handle_tracepoint_query (char *own_buf);
int tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc);
int tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc);
void release_while_stepping_state_list (struct thread_info *tinfo);
int in_readonly_region (CORE_ADDR addr, ULONGEST length);
int traceframe_read_mem (int tfnum, CORE_ADDR addr,
unsigned char *buf, ULONGEST length,
ULONGEST *nbytes);
int fetch_traceframe_registers (int tfnum,
struct regcache *regcache,
int regnum);
int traceframe_read_sdata (int tfnum, ULONGEST offset,
unsigned char *buf, ULONGEST length,
ULONGEST *nbytes);
int traceframe_read_info (int tfnum, std::string *buffer);
/* If a thread is determined to be collecting a fast tracepoint, this
structure holds the collect status. */
struct fast_tpoint_collect_status
{
/* The tracepoint that is presently being collected. */
int tpoint_num;
CORE_ADDR tpoint_addr;
/* The address range in the jump pad of where the original
instruction the tracepoint jump was inserted was relocated
to. */
CORE_ADDR adjusted_insn_addr;
CORE_ADDR adjusted_insn_addr_end;
};
/* The possible states a thread can be in, related to the collection of fast
tracepoint. */
enum class fast_tpoint_collect_result
{
/* Not collecting a fast tracepoint. */
not_collecting,
/* In the jump pad, but before the relocated instruction. */
before_insn,
/* In the jump pad, but at (or after) the relocated instruction. */
at_insn,
};
fast_tpoint_collect_result fast_tracepoint_collecting
(CORE_ADDR thread_area, CORE_ADDR stop_pc,
struct fast_tpoint_collect_status *status);
void force_unlock_trace_buffer (void);
int handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc);
#ifdef IN_PROCESS_AGENT
void initialize_low_tracepoint (void);
const struct target_desc *get_ipa_tdesc (int idx);
void supply_fast_tracepoint_registers (struct regcache *regcache,
const unsigned char *regs);
void supply_static_tracepoint_registers (struct regcache *regcache,
const unsigned char *regs,
CORE_ADDR pc);
void set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end,
char *errmsg);
void *alloc_jump_pad_buffer (size_t size);
#ifndef HAVE_GETAUXVAL
unsigned long getauxval (unsigned long type);
#endif
#else
void stop_tracing (void);
int claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline);
int have_fast_tracepoint_trampoline_buffer (char *msgbuf);
void gdb_agent_about_to_close (int pid);
#endif
struct traceframe;
struct eval_agent_expr_context;
/* When TO is not NULL, do memory copies for bytecodes, read LEN bytes
starting at address FROM, and place the result in the buffer TO.
Return 0 on success, otherwise a non-zero error code.
When TO is NULL, do the recording of memory blocks for actions and
bytecodes into a new traceframe block. Return 0 on success, otherwise,
return 1 if there is an error. */
int agent_mem_read (struct eval_agent_expr_context *ctx,
unsigned char *to, CORE_ADDR from,
ULONGEST len);
LONGEST agent_get_trace_state_variable_value (int num);
void agent_set_trace_state_variable_value (int num, LONGEST val);
/* Record the value of a trace state variable. */
int agent_tsv_read (struct eval_agent_expr_context *ctx, int n);
int agent_mem_read_string (struct eval_agent_expr_context *ctx,
unsigned char *to,
CORE_ADDR from,
ULONGEST len);
/* The prototype the get_raw_reg function in the IPA. Each arch's
bytecode compiler emits calls to this function. */
ULONGEST get_raw_reg (const unsigned char *raw_regs, int regnum);
/* Returns the address of the get_raw_reg function in the IPA. */
CORE_ADDR get_raw_reg_func_addr (void);
/* Returns the address of the get_trace_state_variable_value
function in the IPA. */
CORE_ADDR get_get_tsv_func_addr (void);
/* Returns the address of the set_trace_state_variable_value
function in the IPA. */
CORE_ADDR get_set_tsv_func_addr (void);
#endif /* GDBSERVER_TRACEPOINT_H */
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