1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2018 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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/>. */
20 #include "tracepoint.h"
21 #include "gdbthread.h"
33 #define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */
35 /* This file is built for both GDBserver, and the in-process
36 agent (IPA), a shared library that includes a tracing agent that is
37 loaded by the inferior to support fast tracepoints. Fast
38 tracepoints (or more accurately, jump based tracepoints) are
39 implemented by patching the tracepoint location with a jump into a
40 small trampoline function whose job is to save the register state,
41 call the in-process tracing agent, and then execute the original
42 instruction that was under the tracepoint jump (possibly adjusted,
43 if PC-relative, or some such).
45 The current synchronization design is pull based. That means,
46 GDBserver does most of the work, by peeking/poking at the inferior
47 agent's memory directly for downloading tracepoint and associated
48 objects, and for uploading trace frames. Whenever the IPA needs
49 something from GDBserver (trace buffer is full, tracing stopped for
50 some reason, etc.) the IPA calls a corresponding hook function
51 where GDBserver has placed a breakpoint.
53 Each of the agents has its own trace buffer. When browsing the
54 trace frames built from slow and fast tracepoints from GDB (tfind
55 mode), there's no guarantee the user is seeing the trace frames in
56 strict chronological creation order, although, GDBserver tries to
57 keep the order relatively reasonable, by syncing the trace buffers
62 #ifdef IN_PROCESS_AGENT
64 static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
67 trace_vdebug (const char *fmt
, ...)
73 vsprintf (buf
, fmt
, ap
);
74 fprintf (stderr
, PROG
"/tracepoint: %s\n", buf
);
78 #define trace_debug_1(level, fmt, args...) \
80 if (level <= debug_threads) \
81 trace_vdebug ((fmt), ##args); \
86 #define trace_debug_1(level, fmt, args...) \
88 if (level <= debug_threads) \
90 debug_printf ((fmt), ##args); \
91 debug_printf ("\n"); \
97 #define trace_debug(FMT, args...) \
98 trace_debug_1 (1, FMT, ##args)
100 /* Prefix exported symbols, for good citizenship. All the symbols
101 that need exporting are defined in this module. Note that all
102 these symbols must be tagged with IP_AGENT_EXPORT_*. */
103 #ifdef IN_PROCESS_AGENT
104 # define gdb_tp_heap_buffer IPA_SYM_EXPORTED_NAME (gdb_tp_heap_buffer)
105 # define gdb_jump_pad_buffer IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer)
106 # define gdb_jump_pad_buffer_end IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer_end)
107 # define gdb_trampoline_buffer IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer)
108 # define gdb_trampoline_buffer_end IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_end)
109 # define gdb_trampoline_buffer_error IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_error)
110 # define collecting IPA_SYM_EXPORTED_NAME (collecting)
111 # define gdb_collect_ptr IPA_SYM_EXPORTED_NAME (gdb_collect_ptr)
112 # define stop_tracing IPA_SYM_EXPORTED_NAME (stop_tracing)
113 # define flush_trace_buffer IPA_SYM_EXPORTED_NAME (flush_trace_buffer)
114 # define about_to_request_buffer_space IPA_SYM_EXPORTED_NAME (about_to_request_buffer_space)
115 # define trace_buffer_is_full IPA_SYM_EXPORTED_NAME (trace_buffer_is_full)
116 # define stopping_tracepoint IPA_SYM_EXPORTED_NAME (stopping_tracepoint)
117 # define expr_eval_result IPA_SYM_EXPORTED_NAME (expr_eval_result)
118 # define error_tracepoint IPA_SYM_EXPORTED_NAME (error_tracepoint)
119 # define tracepoints IPA_SYM_EXPORTED_NAME (tracepoints)
120 # define tracing IPA_SYM_EXPORTED_NAME (tracing)
121 # define trace_buffer_ctrl IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl)
122 # define trace_buffer_ctrl_curr IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl_curr)
123 # define trace_buffer_lo IPA_SYM_EXPORTED_NAME (trace_buffer_lo)
124 # define trace_buffer_hi IPA_SYM_EXPORTED_NAME (trace_buffer_hi)
125 # define traceframe_read_count IPA_SYM_EXPORTED_NAME (traceframe_read_count)
126 # define traceframe_write_count IPA_SYM_EXPORTED_NAME (traceframe_write_count)
127 # define traceframes_created IPA_SYM_EXPORTED_NAME (traceframes_created)
128 # define trace_state_variables IPA_SYM_EXPORTED_NAME (trace_state_variables)
129 # define get_raw_reg_ptr IPA_SYM_EXPORTED_NAME (get_raw_reg_ptr)
130 # define get_trace_state_variable_value_ptr \
131 IPA_SYM_EXPORTED_NAME (get_trace_state_variable_value_ptr)
132 # define set_trace_state_variable_value_ptr \
133 IPA_SYM_EXPORTED_NAME (set_trace_state_variable_value_ptr)
134 # define ust_loaded IPA_SYM_EXPORTED_NAME (ust_loaded)
135 # define helper_thread_id IPA_SYM_EXPORTED_NAME (helper_thread_id)
136 # define cmd_buf IPA_SYM_EXPORTED_NAME (cmd_buf)
137 # define ipa_tdesc_idx IPA_SYM_EXPORTED_NAME (ipa_tdesc_idx)
140 #ifndef IN_PROCESS_AGENT
142 /* Addresses of in-process agent's symbols GDBserver cares about. */
144 struct ipa_sym_addresses
146 CORE_ADDR addr_gdb_tp_heap_buffer
;
147 CORE_ADDR addr_gdb_jump_pad_buffer
;
148 CORE_ADDR addr_gdb_jump_pad_buffer_end
;
149 CORE_ADDR addr_gdb_trampoline_buffer
;
150 CORE_ADDR addr_gdb_trampoline_buffer_end
;
151 CORE_ADDR addr_gdb_trampoline_buffer_error
;
152 CORE_ADDR addr_collecting
;
153 CORE_ADDR addr_gdb_collect_ptr
;
154 CORE_ADDR addr_stop_tracing
;
155 CORE_ADDR addr_flush_trace_buffer
;
156 CORE_ADDR addr_about_to_request_buffer_space
;
157 CORE_ADDR addr_trace_buffer_is_full
;
158 CORE_ADDR addr_stopping_tracepoint
;
159 CORE_ADDR addr_expr_eval_result
;
160 CORE_ADDR addr_error_tracepoint
;
161 CORE_ADDR addr_tracepoints
;
162 CORE_ADDR addr_tracing
;
163 CORE_ADDR addr_trace_buffer_ctrl
;
164 CORE_ADDR addr_trace_buffer_ctrl_curr
;
165 CORE_ADDR addr_trace_buffer_lo
;
166 CORE_ADDR addr_trace_buffer_hi
;
167 CORE_ADDR addr_traceframe_read_count
;
168 CORE_ADDR addr_traceframe_write_count
;
169 CORE_ADDR addr_traceframes_created
;
170 CORE_ADDR addr_trace_state_variables
;
171 CORE_ADDR addr_get_raw_reg_ptr
;
172 CORE_ADDR addr_get_trace_state_variable_value_ptr
;
173 CORE_ADDR addr_set_trace_state_variable_value_ptr
;
174 CORE_ADDR addr_ust_loaded
;
175 CORE_ADDR addr_ipa_tdesc_idx
;
183 IPA_SYM(gdb_tp_heap_buffer
),
184 IPA_SYM(gdb_jump_pad_buffer
),
185 IPA_SYM(gdb_jump_pad_buffer_end
),
186 IPA_SYM(gdb_trampoline_buffer
),
187 IPA_SYM(gdb_trampoline_buffer_end
),
188 IPA_SYM(gdb_trampoline_buffer_error
),
190 IPA_SYM(gdb_collect_ptr
),
191 IPA_SYM(stop_tracing
),
192 IPA_SYM(flush_trace_buffer
),
193 IPA_SYM(about_to_request_buffer_space
),
194 IPA_SYM(trace_buffer_is_full
),
195 IPA_SYM(stopping_tracepoint
),
196 IPA_SYM(expr_eval_result
),
197 IPA_SYM(error_tracepoint
),
198 IPA_SYM(tracepoints
),
200 IPA_SYM(trace_buffer_ctrl
),
201 IPA_SYM(trace_buffer_ctrl_curr
),
202 IPA_SYM(trace_buffer_lo
),
203 IPA_SYM(trace_buffer_hi
),
204 IPA_SYM(traceframe_read_count
),
205 IPA_SYM(traceframe_write_count
),
206 IPA_SYM(traceframes_created
),
207 IPA_SYM(trace_state_variables
),
208 IPA_SYM(get_raw_reg_ptr
),
209 IPA_SYM(get_trace_state_variable_value_ptr
),
210 IPA_SYM(set_trace_state_variable_value_ptr
),
212 IPA_SYM(ipa_tdesc_idx
),
215 static struct ipa_sym_addresses ipa_sym_addrs
;
217 static int read_inferior_integer (CORE_ADDR symaddr
, int *val
);
219 /* Returns true if both the in-process agent library and the static
220 tracepoints libraries are loaded in the inferior, and agent has
221 capability on static tracepoints. */
224 in_process_agent_supports_ust (void)
228 if (!agent_loaded_p ())
230 warning ("In-process agent not loaded");
234 if (agent_capability_check (AGENT_CAPA_STATIC_TRACE
))
236 /* Agent understands static tracepoint, then check whether UST is in
237 fact loaded in the inferior. */
238 if (read_inferior_integer (ipa_sym_addrs
.addr_ust_loaded
, &loaded
))
240 warning ("Error reading ust_loaded in lib");
251 write_e_ipa_not_loaded (char *buffer
)
254 "E.In-process agent library not loaded in process. "
255 "Fast and static tracepoints unavailable.");
258 /* Write an error to BUFFER indicating that UST isn't loaded in the
262 write_e_ust_not_loaded (char *buffer
)
266 "E.UST library not loaded in process. "
267 "Static tracepoints unavailable.");
269 sprintf (buffer
, "E.GDBserver was built without static tracepoints support");
273 /* If the in-process agent library isn't loaded in the inferior, write
274 an error to BUFFER, and return 1. Otherwise, return 0. */
277 maybe_write_ipa_not_loaded (char *buffer
)
279 if (!agent_loaded_p ())
281 write_e_ipa_not_loaded (buffer
);
287 /* If the in-process agent library and the ust (static tracepoints)
288 library aren't loaded in the inferior, write an error to BUFFER,
289 and return 1. Otherwise, return 0. */
292 maybe_write_ipa_ust_not_loaded (char *buffer
)
294 if (!agent_loaded_p ())
296 write_e_ipa_not_loaded (buffer
);
299 else if (!in_process_agent_supports_ust ())
301 write_e_ust_not_loaded (buffer
);
307 /* Cache all future symbols that the tracepoints module might request.
308 We can not request symbols at arbitrary states in the remote
309 protocol, only when the client tells us that new symbols are
310 available. So when we load the in-process library, make sure to
311 check the entire list. */
314 tracepoint_look_up_symbols (void)
318 if (agent_loaded_p ())
321 for (i
= 0; i
< sizeof (symbol_list
) / sizeof (symbol_list
[0]); i
++)
324 (CORE_ADDR
*) ((char *) &ipa_sym_addrs
+ symbol_list
[i
].offset
);
326 if (look_up_one_symbol (symbol_list
[i
].name
, addrp
, 1) == 0)
329 debug_printf ("symbol `%s' not found\n", symbol_list
[i
].name
);
334 agent_look_up_symbols (NULL
);
339 /* GDBserver places a breakpoint on the IPA's version (which is a nop)
340 of the "stop_tracing" function. When this breakpoint is hit,
341 tracing stopped in the IPA for some reason. E.g., due to
342 tracepoint reaching the pass count, hitting conditional expression
343 evaluation error, etc.
345 The IPA's trace buffer is never in circular tracing mode: instead,
346 GDBserver's is, and whenever the in-process buffer fills, it calls
347 "flush_trace_buffer", which triggers an internal breakpoint.
348 GDBserver reacts to this breakpoint by pulling the meanwhile
349 collected data. Old frames discarding is always handled on the
352 #ifdef IN_PROCESS_AGENT
354 read_inferior_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
356 memcpy (myaddr
, (void *) (uintptr_t) memaddr
, len
);
360 /* Call this in the functions where GDBserver places a breakpoint, so
361 that the compiler doesn't try to be clever and skip calling the
362 function at all. This is necessary, even if we tell the compiler
363 to not inline said functions. */
365 #if defined(__GNUC__)
366 # define UNKNOWN_SIDE_EFFECTS() asm ("")
368 # define UNKNOWN_SIDE_EFFECTS() do {} while (0)
371 IP_AGENT_EXPORT_FUNC
void
374 /* GDBserver places breakpoint here. */
375 UNKNOWN_SIDE_EFFECTS();
378 IP_AGENT_EXPORT_FUNC
void
379 flush_trace_buffer (void)
381 /* GDBserver places breakpoint here. */
382 UNKNOWN_SIDE_EFFECTS();
387 #ifndef IN_PROCESS_AGENT
389 tracepoint_handler (CORE_ADDR address
)
391 trace_debug ("tracepoint_handler: tracepoint at 0x%s hit",
396 /* Breakpoint at "stop_tracing" in the inferior lib. */
397 struct breakpoint
*stop_tracing_bkpt
;
398 static int stop_tracing_handler (CORE_ADDR
);
400 /* Breakpoint at "flush_trace_buffer" in the inferior lib. */
401 struct breakpoint
*flush_trace_buffer_bkpt
;
402 static int flush_trace_buffer_handler (CORE_ADDR
);
404 static void download_trace_state_variables (void);
405 static void upload_fast_traceframes (void);
407 static int run_inferior_command (char *cmd
, int len
);
410 read_inferior_integer (CORE_ADDR symaddr
, int *val
)
412 return read_inferior_memory (symaddr
, (unsigned char *) val
,
417 static int tracepoint_send_agent (struct tracepoint
*tpoint
);
420 read_inferior_uinteger (CORE_ADDR symaddr
, unsigned int *val
)
422 return read_inferior_memory (symaddr
, (unsigned char *) val
,
427 read_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR
*val
)
429 void *pval
= (void *) (uintptr_t) val
;
432 ret
= read_inferior_memory (symaddr
, (unsigned char *) &pval
, sizeof (pval
));
433 *val
= (uintptr_t) pval
;
438 write_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR val
)
440 void *pval
= (void *) (uintptr_t) val
;
441 return write_inferior_memory (symaddr
,
442 (unsigned char *) &pval
, sizeof (pval
));
446 write_inferior_integer (CORE_ADDR symaddr
, int val
)
448 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
452 write_inferior_int8 (CORE_ADDR symaddr
, int8_t val
)
454 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
458 write_inferior_uinteger (CORE_ADDR symaddr
, unsigned int val
)
460 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
463 static CORE_ADDR
target_malloc (ULONGEST size
);
465 #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \
467 memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \
468 BUF += sizeof ((OBJ)->FIELD); \
473 /* Base action. Concrete actions inherit this. */
475 struct tracepoint_action
480 /* An 'M' (collect memory) action. */
481 struct collect_memory_action
483 struct tracepoint_action base
;
490 /* An 'R' (collect registers) action. */
492 struct collect_registers_action
494 struct tracepoint_action base
;
497 /* An 'X' (evaluate expression) action. */
499 struct eval_expr_action
501 struct tracepoint_action base
;
503 struct agent_expr
*expr
;
506 /* An 'L' (collect static trace data) action. */
507 struct collect_static_trace_data_action
509 struct tracepoint_action base
;
512 #ifndef IN_PROCESS_AGENT
514 m_tracepoint_action_download (const struct tracepoint_action
*action
)
516 CORE_ADDR ipa_action
= target_malloc (sizeof (struct collect_memory_action
));
518 write_inferior_memory (ipa_action
, (unsigned char *) action
,
519 sizeof (struct collect_memory_action
));
524 m_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
526 struct collect_memory_action
*maction
527 = (struct collect_memory_action
*) action
;
529 COPY_FIELD_TO_BUF (buffer
, maction
, addr
);
530 COPY_FIELD_TO_BUF (buffer
, maction
, len
);
531 COPY_FIELD_TO_BUF (buffer
, maction
, basereg
);
537 r_tracepoint_action_download (const struct tracepoint_action
*action
)
539 CORE_ADDR ipa_action
= target_malloc (sizeof (struct collect_registers_action
));
541 write_inferior_memory (ipa_action
, (unsigned char *) action
,
542 sizeof (struct collect_registers_action
));
548 r_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
553 static CORE_ADDR
download_agent_expr (struct agent_expr
*expr
);
556 x_tracepoint_action_download (const struct tracepoint_action
*action
)
558 CORE_ADDR ipa_action
= target_malloc (sizeof (struct eval_expr_action
));
561 write_inferior_memory (ipa_action
, (unsigned char *) action
,
562 sizeof (struct eval_expr_action
));
563 expr
= download_agent_expr (((struct eval_expr_action
*) action
)->expr
);
564 write_inferior_data_pointer (ipa_action
565 + offsetof (struct eval_expr_action
, expr
),
571 /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL,
572 copy 0 to P. Return updated header of buffer. */
575 agent_expr_send (char *p
, const struct agent_expr
*aexpr
)
577 /* Copy the length of condition first, and then copy its
586 memcpy (p
, &aexpr
->length
, 4);
589 memcpy (p
, aexpr
->bytes
, aexpr
->length
);
596 x_tracepoint_action_send ( char *buffer
, const struct tracepoint_action
*action
)
598 struct eval_expr_action
*eaction
= (struct eval_expr_action
*) action
;
600 return agent_expr_send (buffer
, eaction
->expr
);
604 l_tracepoint_action_download (const struct tracepoint_action
*action
)
607 = target_malloc (sizeof (struct collect_static_trace_data_action
));
609 write_inferior_memory (ipa_action
, (unsigned char *) action
,
610 sizeof (struct collect_static_trace_data_action
));
616 l_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
622 tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
624 switch (action
->type
)
627 return m_tracepoint_action_send (buffer
, action
);
629 return r_tracepoint_action_send (buffer
, action
);
631 return x_tracepoint_action_send (buffer
, action
);
633 return l_tracepoint_action_send (buffer
, action
);
635 error ("Unknown trace action '%c'.", action
->type
);
639 tracepoint_action_download (const struct tracepoint_action
*action
)
641 switch (action
->type
)
644 return m_tracepoint_action_download (action
);
646 return r_tracepoint_action_download (action
);
648 return x_tracepoint_action_download (action
);
650 return l_tracepoint_action_download (action
);
652 error ("Unknown trace action '%c'.", action
->type
);
656 /* This structure describes a piece of the source-level definition of
657 the tracepoint. The contents are not interpreted by the target,
658 but preserved verbatim for uploading upon reconnection. */
662 /* The type of string, such as "cond" for a conditional. */
665 /* The source-level string itself. For the sake of target
666 debugging, we store it in plaintext, even though it is always
667 transmitted in hex. */
670 /* Link to the next one in the list. We link them in the order
671 received, in case some make up an ordered list of commands or
673 struct source_string
*next
;
678 /* Trap based tracepoint. */
681 /* A fast tracepoint implemented with a jump instead of a trap. */
684 /* A static tracepoint, implemented by a program call into a tracing
689 struct tracepoint_hit_ctx
;
691 typedef enum eval_result_type (*condfn
) (unsigned char *,
694 /* The definition of a tracepoint. */
696 /* Tracepoints may have multiple locations, each at a different
697 address. This can occur with optimizations, template
698 instantiation, etc. Since the locations may be in different
699 scopes, the conditions and actions may be different for each
700 location. Our target version of tracepoints is more like GDB's
701 notion of "breakpoint locations", but we have almost nothing that
702 is not per-location, so we bother having two kinds of objects. The
703 key consequence is that numbers are not unique, and that it takes
704 both number and address to identify a tracepoint uniquely. */
708 /* The number of the tracepoint, as specified by GDB. Several
709 tracepoint objects here may share a number. */
712 /* Address at which the tracepoint is supposed to trigger. Several
713 tracepoints may share an address. */
716 /* Tracepoint type. */
717 enum tracepoint_type type
;
719 /* True if the tracepoint is currently enabled. */
722 /* The number of single steps that will be performed after each
726 /* The number of times the tracepoint may be hit before it will
727 terminate the entire tracing run. */
730 /* Pointer to the agent expression that is the tracepoint's
731 conditional, or NULL if the tracepoint is unconditional. */
732 struct agent_expr
*cond
;
734 /* The list of actions to take when the tracepoint triggers. */
736 struct tracepoint_action
**actions
;
738 /* Count of the times we've hit this tracepoint during the run.
739 Note that while-stepping steps are not counted as "hits". */
742 /* Cached sum of the sizes of traceframes created by this point. */
743 uint64_t traceframe_usage
;
745 CORE_ADDR compiled_cond
;
747 /* Link to the next tracepoint in the list. */
748 struct tracepoint
*next
;
750 #ifndef IN_PROCESS_AGENT
751 /* The list of actions to take when the tracepoint triggers, in
752 string/packet form. */
755 /* The collection of strings that describe the tracepoint as it was
756 entered into GDB. These are not used by the target, but are
757 reported back to GDB upon reconnection. */
758 struct source_string
*source_strings
;
760 /* The number of bytes displaced by fast tracepoints. It may subsume
761 multiple instructions, for multi-byte fast tracepoints. This
762 field is only valid for fast tracepoints. */
765 /* Only for fast tracepoints. */
766 CORE_ADDR obj_addr_on_target
;
768 /* Address range where the original instruction under a fast
769 tracepoint was relocated to. (_end is actually one byte past
771 CORE_ADDR adjusted_insn_addr
;
772 CORE_ADDR adjusted_insn_addr_end
;
774 /* The address range of the piece of the jump pad buffer that was
775 assigned to this fast tracepoint. (_end is actually one byte
778 CORE_ADDR jump_pad_end
;
780 /* The address range of the piece of the trampoline buffer that was
781 assigned to this fast tracepoint. (_end is actually one byte
783 CORE_ADDR trampoline
;
784 CORE_ADDR trampoline_end
;
786 /* The list of actions to take while in a stepping loop. These
787 fields are only valid for patch-based tracepoints. */
788 int num_step_actions
;
789 struct tracepoint_action
**step_actions
;
790 /* Same, but in string/packet form. */
791 char **step_actions_str
;
793 /* Handle returned by the breakpoint or tracepoint module when we
794 inserted the trap or jump, or hooked into a static tracepoint.
795 NULL if we haven't inserted it yet. */
801 #ifndef IN_PROCESS_AGENT
803 /* Given `while-stepping', a thread may be collecting data for more
804 than one tracepoint simultaneously. On the other hand, the same
805 tracepoint with a while-stepping action may be hit by more than one
806 thread simultaneously (but not quite, each thread could be handling
807 a different step). Each thread holds a list of these objects,
808 representing the current step of each while-stepping action being
813 struct wstep_state
*next
;
815 /* The tracepoint number. */
817 /* The tracepoint's address. */
818 CORE_ADDR tp_address
;
820 /* The number of the current step in this 'while-stepping'
829 /* The linked list of all tracepoints. Marked explicitly as used as
830 the in-process library doesn't use it for the fast tracepoints
832 IP_AGENT_EXPORT_VAR
struct tracepoint
*tracepoints
;
834 /* The first tracepoint to exceed its pass count. */
836 IP_AGENT_EXPORT_VAR
struct tracepoint
*stopping_tracepoint
;
838 /* True if the trace buffer is full or otherwise no longer usable. */
840 IP_AGENT_EXPORT_VAR
int trace_buffer_is_full
;
842 /* The first error that occurred during expression evaluation. */
844 /* Stored as an int to avoid the IPA ABI being dependent on whatever
845 the compiler decides to use for the enum's underlying type. Holds
846 enum eval_result_type values. */
847 IP_AGENT_EXPORT_VAR
int expr_eval_result
= expr_eval_no_error
;
851 #ifndef IN_PROCESS_AGENT
853 /* Pointer to the last tracepoint in the list, new tracepoints are
854 linked in at the end. */
856 static struct tracepoint
*last_tracepoint
;
858 static const char *eval_result_names
[] =
860 "terror:in the attic", /* this should never be reported */
861 "terror:empty expression",
862 "terror:empty stack",
863 "terror:stack overflow",
864 "terror:stack underflow",
865 "terror:unhandled opcode",
866 "terror:unrecognized opcode",
867 "terror:divide by zero"
872 /* The tracepoint in which the error occurred. */
875 IP_AGENT_EXPORT_VAR
struct tracepoint
*error_tracepoint
;
878 struct trace_state_variable
880 /* This is the name of the variable as used in GDB. The target
881 doesn't use the name, but needs to have it for saving and
882 reconnection purposes. */
885 /* This number identifies the variable uniquely. Numbers may be
886 assigned either by the target (in the case of builtin variables),
887 or by GDB, and are presumed unique during the course of a trace
891 /* The variable's initial value, a 64-bit signed integer always. */
892 LONGEST initial_value
;
894 /* The variable's value, a 64-bit signed integer always. */
897 /* Pointer to a getter function, used to supply computed values. */
898 LONGEST (*getter
) (void);
900 /* Link to the next variable. */
901 struct trace_state_variable
*next
;
904 /* Linked list of all trace state variables. */
906 #ifdef IN_PROCESS_AGENT
907 struct trace_state_variable
*alloced_trace_state_variables
;
910 IP_AGENT_EXPORT_VAR
struct trace_state_variable
*trace_state_variables
;
912 /* The results of tracing go into a fixed-size space known as the
913 "trace buffer". Because usage follows a limited number of
914 patterns, we manage it ourselves rather than with malloc. Basic
915 rules are that we create only one trace frame at a time, each is
916 variable in size, they are never moved once created, and we only
917 discard if we are doing a circular buffer, and then only the oldest
918 ones. Each trace frame includes its own size, so we don't need to
919 link them together, and the trace frame number is relative to the
920 first one, so we don't need to record numbers. A trace frame also
921 records the number of the tracepoint that created it. The data
922 itself is a series of blocks, each introduced by a single character
923 and with a defined format. Each type of block has enough
924 type/length info to allow scanners to jump quickly from one block
925 to the next without reading each byte in the block. */
927 /* Trace buffer management would be simple - advance a free pointer
928 from beginning to end, then stop - were it not for the circular
929 buffer option, which is a useful way to prevent a trace run from
930 stopping prematurely because the buffer filled up. In the circular
931 case, the location of the first trace frame (trace_buffer_start)
932 moves as old trace frames are discarded. Also, since we grow trace
933 frames incrementally as actions are performed, we wrap around to
934 the beginning of the trace buffer. This is per-block, so each
935 block within a trace frame remains contiguous. Things get messy
936 when the wrapped-around trace frame is the one being discarded; the
937 free space ends up in two parts at opposite ends of the buffer. */
940 # if defined(__GNUC__)
941 # define ATTR_PACKED __attribute__ ((packed))
943 # define ATTR_PACKED /* nothing */
947 /* The data collected at a tracepoint hit. This object should be as
948 small as possible, since there may be a great many of them. We do
949 not need to keep a frame number, because they are all sequential
950 and there are no deletions; so the Nth frame in the buffer is
951 always frame number N. */
955 /* Number of the tracepoint that collected this traceframe. A value
956 of 0 indicates the current end of the trace buffer. We make this
957 a 16-bit field because it's never going to happen that GDB's
958 numbering of tracepoints reaches 32,000. */
961 /* The size of the data in this trace frame. We limit this to 32
962 bits, even on a 64-bit target, because it's just implausible that
963 one is validly going to collect 4 gigabytes of data at a single
965 unsigned int data_size
: 32;
967 /* The base of the trace data, which is contiguous from this point. */
968 unsigned char data
[0];
972 /* The size of the EOB marker, in bytes. A traceframe with zeroed
973 fields (and no data) marks the end of trace data. */
974 #define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data)
976 /* The traceframe to be used as the source of data to send back to
977 GDB. A value of -1 means to get data from the live program. */
979 int current_traceframe
= -1;
981 /* This flag is true if the trace buffer is circular, meaning that
982 when it fills, the oldest trace frames are discarded in order to
985 #ifndef IN_PROCESS_AGENT
986 static int circular_trace_buffer
;
989 /* Size of the trace buffer. */
991 static LONGEST trace_buffer_size
;
995 /* Pointer to the block of memory that traceframes all go into. */
997 IP_AGENT_EXPORT_VAR
unsigned char *trace_buffer_lo
;
999 /* Pointer to the end of the trace buffer, more precisely to the byte
1000 after the end of the buffer. */
1002 IP_AGENT_EXPORT_VAR
unsigned char *trace_buffer_hi
;
1006 /* Control structure holding the read/write/etc. pointers into the
1007 trace buffer. We need more than one of these to implement a
1008 transaction-like mechanism to garantees that both GDBserver and the
1009 in-process agent can try to change the trace buffer
1012 struct trace_buffer_control
1014 /* Pointer to the first trace frame in the buffer. In the
1015 non-circular case, this is equal to trace_buffer_lo, otherwise it
1016 moves around in the buffer. */
1017 unsigned char *start
;
1019 /* Pointer to the free part of the trace buffer. Note that we clear
1020 several bytes at and after this pointer, so that traceframe
1021 scans/searches terminate properly. */
1022 unsigned char *free
;
1024 /* Pointer to the byte after the end of the free part. Note that
1025 this may be smaller than trace_buffer_free in the circular case,
1026 and means that the free part is in two pieces. Initially it is
1027 equal to trace_buffer_hi, then is generally equivalent to
1028 trace_buffer_start. */
1029 unsigned char *end_free
;
1031 /* Pointer to the wraparound. If not equal to trace_buffer_hi, then
1032 this is the point at which the trace data breaks, and resumes at
1034 unsigned char *wrap
;
1037 /* Same as above, to be used by GDBserver when updating the in-process
1039 struct ipa_trace_buffer_control
1048 /* We have possibly both GDBserver and an inferior thread accessing
1049 the same IPA trace buffer memory. The IPA is the producer (tries
1050 to put new frames in the buffer), while GDBserver occasionally
1051 consumes them, that is, flushes the IPA's buffer into its own
1052 buffer. Both sides need to update the trace buffer control
1053 pointers (current head, tail, etc.). We can't use a global lock to
1054 synchronize the accesses, as otherwise we could deadlock GDBserver
1055 (if the thread holding the lock stops for a signal, say). So
1056 instead of that, we use a transaction scheme where GDBserver writes
1057 always prevail over the IPAs writes, and, we have the IPA detect
1058 the commit failure/overwrite, and retry the whole attempt. This is
1059 mainly implemented by having a global token object that represents
1060 who wrote last to the buffer control structure. We need to freeze
1061 any inferior writing to the buffer while GDBserver touches memory,
1062 so that the inferior can correctly detect that GDBserver had been
1063 there, otherwise, it could mistakingly think its commit was
1064 successful; that's implemented by simply having GDBserver set a
1065 breakpoint the inferior hits if it is the critical region.
1067 There are three cycling trace buffer control structure copies
1068 (buffer head, tail, etc.), with the token object including an index
1069 indicating which is current live copy. The IPA tentatively builds
1070 an updated copy in a non-current control structure, while GDBserver
1071 always clobbers the current version directly. The IPA then tries
1072 to atomically "commit" its version; if GDBserver clobbered the
1073 structure meanwhile, that will fail, and the IPA restarts the
1076 Listing the step in further detail, we have:
1078 In-process agent (producer):
1080 - passes by `about_to_request_buffer_space' breakpoint/lock
1082 - reads current token, extracts current trace buffer control index,
1083 and starts tentatively updating the rightmost one (0->1, 1->2,
1084 2->0). Note that only one inferior thread is executing this code
1085 at any given time, due to an outer lock in the jump pads.
1087 - updates counters, and tries to commit the token.
1089 - passes by second `about_to_request_buffer_space' breakpoint/lock,
1090 leaving the sync region.
1092 - checks if the update was effective.
1094 - if trace buffer was found full, hits flush_trace_buffer
1095 breakpoint, and restarts later afterwards.
1097 GDBserver (consumer):
1099 - sets `about_to_request_buffer_space' breakpoint/lock.
1101 - updates the token unconditionally, using the current buffer
1102 control index, since it knows that the IP agent always writes to
1103 the rightmost, and due to the breakpoint, at most one IP thread
1104 can try to update the trace buffer concurrently to GDBserver, so
1105 there will be no danger of trace buffer control index wrap making
1106 the IPA write to the same index as GDBserver.
1108 - flushes the IP agent's trace buffer completely, and updates the
1109 current trace buffer control structure. GDBserver *always* wins.
1111 - removes the `about_to_request_buffer_space' breakpoint.
1113 The token is stored in the `trace_buffer_ctrl_curr' variable.
1114 Internally, it's bits are defined as:
1116 |-------------+-----+-------------+--------+-------------+--------------|
1117 | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 |
1118 |-------------+-----+-------------+--------+-------------+--------------|
1119 | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) |
1120 |-------------+-----+-------------+--------+-------------+--------------|
1122 GSB - GDBserver Stamp Bit
1123 PC - Previous Counter
1124 CC - Current Counter
1125 TBCI - Trace Buffer Control Index
1128 An IPA update of `trace_buffer_ctrl_curr' does:
1130 - read CC from the current token, save as PC.
1132 - atomically tries to write PC+1,CC
1134 A GDBserver update of `trace_buffer_ctrl_curr' does:
1136 - reads PC and CC from the current token.
1141 /* These are the bits of `trace_buffer_ctrl_curr' that are reserved
1142 for the counters described below. The cleared bits are used to
1143 hold the index of the items of the `trace_buffer_ctrl' array that
1145 #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0
1147 /* `trace_buffer_ctrl_curr' contains two counters. The `previous'
1148 counter, and the `current' counter. */
1150 #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000
1151 #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00
1153 /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it
1154 always stamps this bit as set. */
1155 #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000
1157 #ifdef IN_PROCESS_AGENT
1158 IP_AGENT_EXPORT_VAR
struct trace_buffer_control trace_buffer_ctrl
[3];
1159 IP_AGENT_EXPORT_VAR
unsigned int trace_buffer_ctrl_curr
;
1161 # define TRACE_BUFFER_CTRL_CURR \
1162 (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK)
1166 /* The GDBserver side agent only needs one instance of this object, as
1167 it doesn't need to sync with itself. Define it as array anyway so
1168 that the rest of the code base doesn't need to care for the
1170 struct trace_buffer_control trace_buffer_ctrl
[1];
1171 # define TRACE_BUFFER_CTRL_CURR 0
1174 /* These are convenience macros used to access the current trace
1175 buffer control in effect. */
1176 #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start)
1177 #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free)
1178 #define trace_buffer_end_free \
1179 (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free)
1180 #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap)
1183 /* Macro that returns a pointer to the first traceframe in the buffer. */
1185 #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start)
1187 /* Macro that returns a pointer to the next traceframe in the buffer.
1188 If the computed location is beyond the wraparound point, subtract
1189 the offset of the wraparound. */
1191 #define NEXT_TRACEFRAME_1(TF) \
1192 (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size)
1194 #define NEXT_TRACEFRAME(TF) \
1195 ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \
1196 - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \
1197 ? (trace_buffer_wrap - trace_buffer_lo) \
1200 /* The difference between these counters represents the total number
1201 of complete traceframes present in the trace buffer. The IP agent
1202 writes to the write count, GDBserver writes to read count. */
1204 IP_AGENT_EXPORT_VAR
unsigned int traceframe_write_count
;
1205 IP_AGENT_EXPORT_VAR
unsigned int traceframe_read_count
;
1207 /* Convenience macro. */
1209 #define traceframe_count \
1210 ((unsigned int) (traceframe_write_count - traceframe_read_count))
1212 /* The count of all traceframes created in the current run, including
1213 ones that were discarded to make room. */
1215 IP_AGENT_EXPORT_VAR
int traceframes_created
;
1217 #ifndef IN_PROCESS_AGENT
1219 /* Read-only regions are address ranges whose contents don't change,
1220 and so can be read from target memory even while looking at a trace
1221 frame. Without these, disassembly for instance will likely fail,
1222 because the program code is not usually collected into a trace
1223 frame. This data structure does not need to be very complicated or
1224 particularly efficient, it's only going to be used occasionally,
1225 and only by some commands. */
1227 struct readonly_region
1229 /* The bounds of the region. */
1230 CORE_ADDR start
, end
;
1232 /* Link to the next one. */
1233 struct readonly_region
*next
;
1236 /* Linked list of readonly regions. This list stays in effect from
1237 one tstart to the next. */
1239 static struct readonly_region
*readonly_regions
;
1243 /* The global that controls tracing overall. */
1245 IP_AGENT_EXPORT_VAR
int tracing
;
1247 #ifndef IN_PROCESS_AGENT
1249 /* Controls whether tracing should continue after GDB disconnects. */
1251 int disconnected_tracing
;
1253 /* The reason for the last tracing run to have stopped. We initialize
1254 to a distinct string so that GDB can distinguish between "stopped
1255 after running" and "stopped because never run" cases. */
1257 static const char *tracing_stop_reason
= "tnotrun";
1259 static int tracing_stop_tpnum
;
1261 /* 64-bit timestamps for the trace run's start and finish, expressed
1262 in microseconds from the Unix epoch. */
1264 LONGEST tracing_start_time
;
1265 LONGEST tracing_stop_time
;
1267 /* The (optional) user-supplied name of the user that started the run.
1268 This is an arbitrary string, and may be NULL. */
1270 char *tracing_user_name
;
1272 /* Optional user-supplied text describing the run. This is
1273 an arbitrary string, and may be NULL. */
1275 char *tracing_notes
;
1277 /* Optional user-supplied text explaining a tstop command. This is an
1278 arbitrary string, and may be NULL. */
1280 char *tracing_stop_note
;
1284 /* Functions local to this file. */
1286 /* Base "class" for tracepoint type specific data to be passed down to
1287 collect_data_at_tracepoint. */
1288 struct tracepoint_hit_ctx
1290 enum tracepoint_type type
;
1293 #ifdef IN_PROCESS_AGENT
1295 /* Fast/jump tracepoint specific data to be passed down to
1296 collect_data_at_tracepoint. */
1297 struct fast_tracepoint_ctx
1299 struct tracepoint_hit_ctx base
;
1301 struct regcache regcache
;
1302 int regcache_initted
;
1303 unsigned char *regspace
;
1305 unsigned char *regs
;
1306 struct tracepoint
*tpoint
;
1309 /* Static tracepoint specific data to be passed down to
1310 collect_data_at_tracepoint. */
1311 struct static_tracepoint_ctx
1313 struct tracepoint_hit_ctx base
;
1315 /* The regcache corresponding to the registers state at the time of
1316 the tracepoint hit. Initialized lazily, from REGS. */
1317 struct regcache regcache
;
1318 int regcache_initted
;
1320 /* The buffer space REGCACHE above uses. We use a separate buffer
1321 instead of letting the regcache malloc for both signal safety and
1322 performance reasons; this is allocated on the stack instead. */
1323 unsigned char *regspace
;
1325 /* The register buffer as passed on by lttng/ust. */
1326 struct registers
*regs
;
1328 /* The "printf" formatter and the args the user passed to the marker
1329 call. We use this to be able to collect "static trace data"
1334 /* The GDB tracepoint matching the probed marker that was "hit". */
1335 struct tracepoint
*tpoint
;
1340 /* Static tracepoint specific data to be passed down to
1341 collect_data_at_tracepoint. */
1342 struct trap_tracepoint_ctx
1344 struct tracepoint_hit_ctx base
;
1346 struct regcache
*regcache
;
1351 #ifndef IN_PROCESS_AGENT
1352 static CORE_ADDR
traceframe_get_pc (struct traceframe
*tframe
);
1353 static int traceframe_read_tsv (int num
, LONGEST
*val
);
1356 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1357 struct tracepoint
*tpoint
);
1359 #ifndef IN_PROCESS_AGENT
1360 static void clear_readonly_regions (void);
1361 static void clear_installed_tracepoints (void);
1364 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1366 struct tracepoint
*tpoint
);
1367 #ifndef IN_PROCESS_AGENT
1368 static void collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
1370 struct tracepoint
*tpoint
, int current_step
);
1371 static void compile_tracepoint_condition (struct tracepoint
*tpoint
,
1372 CORE_ADDR
*jump_entry
);
1374 static void do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1376 struct tracepoint
*tpoint
,
1377 struct traceframe
*tframe
,
1378 struct tracepoint_action
*taction
);
1380 #ifndef IN_PROCESS_AGENT
1381 static struct tracepoint
*fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR
);
1383 static void install_tracepoint (struct tracepoint
*, char *own_buf
);
1384 static void download_tracepoint (struct tracepoint
*);
1385 static int install_fast_tracepoint (struct tracepoint
*, char *errbuf
);
1386 static void clone_fast_tracepoint (struct tracepoint
*to
,
1387 const struct tracepoint
*from
);
1390 static LONGEST
get_timestamp (void);
1392 #if defined(__GNUC__)
1393 # define memory_barrier() asm volatile ("" : : : "memory")
1395 # define memory_barrier() do {} while (0)
1398 /* We only build the IPA if this builtin is supported, and there are
1399 no uses of this in GDBserver itself, so we're safe in defining this
1401 #define cmpxchg(mem, oldval, newval) \
1402 __sync_val_compare_and_swap (mem, oldval, newval)
1404 /* Record that an error occurred during expression evaluation. */
1407 record_tracepoint_error (struct tracepoint
*tpoint
, const char *which
,
1408 enum eval_result_type rtype
)
1410 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1411 tpoint
->number
, paddress (tpoint
->address
), which
, rtype
);
1413 #ifdef IN_PROCESS_AGENT
1414 /* Only record the first error we get. */
1415 if (cmpxchg (&expr_eval_result
,
1417 rtype
) != expr_eval_no_error
)
1420 if (expr_eval_result
!= expr_eval_no_error
)
1424 error_tracepoint
= tpoint
;
1427 /* Trace buffer management. */
1430 clear_trace_buffer (void)
1432 trace_buffer_start
= trace_buffer_lo
;
1433 trace_buffer_free
= trace_buffer_lo
;
1434 trace_buffer_end_free
= trace_buffer_hi
;
1435 trace_buffer_wrap
= trace_buffer_hi
;
1436 /* A traceframe with zeroed fields marks the end of trace data. */
1437 ((struct traceframe
*) trace_buffer_free
)->tpnum
= 0;
1438 ((struct traceframe
*) trace_buffer_free
)->data_size
= 0;
1439 traceframe_read_count
= traceframe_write_count
= 0;
1440 traceframes_created
= 0;
1443 #ifndef IN_PROCESS_AGENT
1446 clear_inferior_trace_buffer (void)
1448 CORE_ADDR ipa_trace_buffer_lo
;
1449 CORE_ADDR ipa_trace_buffer_hi
;
1450 struct traceframe ipa_traceframe
= { 0 };
1451 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
1453 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
1454 &ipa_trace_buffer_lo
);
1455 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
1456 &ipa_trace_buffer_hi
);
1458 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
1459 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
1460 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
1461 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
1463 /* A traceframe with zeroed fields marks the end of trace data. */
1464 write_inferior_memory (ipa_sym_addrs
.addr_trace_buffer_ctrl
,
1465 (unsigned char *) &ipa_trace_buffer_ctrl
,
1466 sizeof (ipa_trace_buffer_ctrl
));
1468 write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
, 0);
1470 /* A traceframe with zeroed fields marks the end of trace data. */
1471 write_inferior_memory (ipa_trace_buffer_lo
,
1472 (unsigned char *) &ipa_traceframe
,
1473 sizeof (ipa_traceframe
));
1475 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
, 0);
1476 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
, 0);
1477 write_inferior_integer (ipa_sym_addrs
.addr_traceframes_created
, 0);
1483 init_trace_buffer (LONGEST bufsize
)
1487 trace_buffer_size
= bufsize
;
1489 /* Make sure to internally allocate at least space for the EOB
1491 alloc_size
= (bufsize
< TRACEFRAME_EOB_MARKER_SIZE
1492 ? TRACEFRAME_EOB_MARKER_SIZE
: bufsize
);
1493 trace_buffer_lo
= (unsigned char *) xrealloc (trace_buffer_lo
, alloc_size
);
1495 trace_buffer_hi
= trace_buffer_lo
+ trace_buffer_size
;
1497 clear_trace_buffer ();
1500 #ifdef IN_PROCESS_AGENT
1502 IP_AGENT_EXPORT_FUNC
void
1503 about_to_request_buffer_space (void)
1505 /* GDBserver places breakpoint here while it goes about to flush
1506 data at random times. */
1507 UNKNOWN_SIDE_EFFECTS();
1512 /* Carve out a piece of the trace buffer, returning NULL in case of
1516 trace_buffer_alloc (size_t amt
)
1518 unsigned char *rslt
;
1519 struct trace_buffer_control
*tbctrl
;
1521 #ifdef IN_PROCESS_AGENT
1522 unsigned int prev
, prev_filtered
;
1523 unsigned int commit_count
;
1524 unsigned int commit
;
1525 unsigned int readout
;
1527 struct traceframe
*oldest
;
1528 unsigned char *new_start
;
1531 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1532 (long) amt
, (long) sizeof (struct traceframe
));
1534 /* Account for the EOB marker. */
1535 amt
+= TRACEFRAME_EOB_MARKER_SIZE
;
1537 #ifdef IN_PROCESS_AGENT
1541 /* Read the current token and extract the index to try to write to,
1542 storing it in CURR. */
1543 prev
= trace_buffer_ctrl_curr
;
1544 prev_filtered
= prev
& ~GDBSERVER_FLUSH_COUNT_MASK
;
1545 curr
= prev_filtered
+ 1;
1549 about_to_request_buffer_space ();
1551 /* Start out with a copy of the current state. GDBserver may be
1552 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1553 be able to commit anyway if that happens. */
1554 trace_buffer_ctrl
[curr
]
1555 = trace_buffer_ctrl
[prev_filtered
];
1556 trace_debug ("trying curr=%u", curr
);
1558 /* The GDBserver's agent doesn't need all that syncing, and always
1559 updates TCB 0 (there's only one, mind you). */
1562 tbctrl
= &trace_buffer_ctrl
[curr
];
1564 /* Offsets are easier to grok for debugging than raw addresses,
1565 especially for the small trace buffer sizes that are useful for
1567 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1569 (int) (tbctrl
->start
- trace_buffer_lo
),
1570 (int) (tbctrl
->free
- trace_buffer_lo
),
1571 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1572 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1573 (int) (trace_buffer_hi
- trace_buffer_lo
));
1575 /* The algorithm here is to keep trying to get a contiguous block of
1576 the requested size, possibly discarding older traceframes to free
1577 up space. Since free space might come in one or two pieces,
1578 depending on whether discarded traceframes wrapped around at the
1579 high end of the buffer, we test both pieces after each
1583 /* First, if we have two free parts, try the upper one first. */
1584 if (tbctrl
->end_free
< tbctrl
->free
)
1586 if (tbctrl
->free
+ amt
<= trace_buffer_hi
)
1587 /* We have enough in the upper part. */
1591 /* Our high part of free space wasn't enough. Give up
1592 on it for now, set wraparound. We will recover the
1593 space later, if/when the wrapped-around traceframe is
1595 trace_debug ("Upper part too small, setting wraparound");
1596 tbctrl
->wrap
= tbctrl
->free
;
1597 tbctrl
->free
= trace_buffer_lo
;
1601 /* The normal case. */
1602 if (tbctrl
->free
+ amt
<= tbctrl
->end_free
)
1605 #ifdef IN_PROCESS_AGENT
1606 /* The IP Agent's buffer is always circular. It isn't used
1607 currently, but `circular_trace_buffer' could represent
1608 GDBserver's mode. If we didn't find space, ask GDBserver to
1611 flush_trace_buffer ();
1615 trace_debug ("gdbserver flushed buffer, retrying");
1619 /* GDBserver cancelled the tracing. Bail out as well. */
1622 /* If we're here, then neither part is big enough, and
1623 non-circular trace buffers are now full. */
1624 if (!circular_trace_buffer
)
1626 trace_debug ("Not enough space in the trace buffer");
1630 trace_debug ("Need more space in the trace buffer");
1632 /* If we have a circular buffer, we can try discarding the
1633 oldest traceframe and see if that helps. */
1634 oldest
= FIRST_TRACEFRAME ();
1635 if (oldest
->tpnum
== 0)
1637 /* Not good; we have no traceframes to free. Perhaps we're
1638 asking for a block that is larger than the buffer? In
1639 any case, give up. */
1640 trace_debug ("No traceframes to discard");
1644 /* We don't run this code in the in-process agent currently.
1645 E.g., we could leave the in-process agent in autonomous
1646 circular mode if we only have fast tracepoints. If we do
1647 that, then this bit becomes racy with GDBserver, which also
1648 writes to this counter. */
1649 --traceframe_write_count
;
1651 new_start
= (unsigned char *) NEXT_TRACEFRAME (oldest
);
1652 /* If we freed the traceframe that wrapped around, go back
1653 to the non-wrap case. */
1654 if (new_start
< tbctrl
->start
)
1656 trace_debug ("Discarding past the wraparound");
1657 tbctrl
->wrap
= trace_buffer_hi
;
1659 tbctrl
->start
= new_start
;
1660 tbctrl
->end_free
= tbctrl
->start
;
1662 trace_debug ("Discarded a traceframe\n"
1663 "Trace buffer [%d], start=%d free=%d "
1664 "endfree=%d wrap=%d hi=%d",
1666 (int) (tbctrl
->start
- trace_buffer_lo
),
1667 (int) (tbctrl
->free
- trace_buffer_lo
),
1668 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1669 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1670 (int) (trace_buffer_hi
- trace_buffer_lo
));
1672 /* Now go back around the loop. The discard might have resulted
1673 in either one or two pieces of free space, so we want to try
1674 both before freeing any more traceframes. */
1678 /* If we get here, we know we can provide the asked-for space. */
1680 rslt
= tbctrl
->free
;
1682 /* Adjust the request back down, now that we know we have space for
1683 the marker, but don't commit to AMT yet, we may still need to
1684 restart the operation if GDBserver touches the trace buffer
1685 (obviously only important in the in-process agent's version). */
1686 tbctrl
->free
+= (amt
- sizeof (struct traceframe
));
1688 /* Or not. If GDBserver changed the trace buffer behind our back,
1689 we get to restart a new allocation attempt. */
1691 #ifdef IN_PROCESS_AGENT
1692 /* Build the tentative token. */
1693 commit_count
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) + 0x100)
1694 & GDBSERVER_FLUSH_COUNT_MASK_CURR
);
1695 commit
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) << 12)
1699 /* Try to commit it. */
1700 readout
= cmpxchg (&trace_buffer_ctrl_curr
, prev
, commit
);
1701 if (readout
!= prev
)
1703 trace_debug ("GDBserver has touched the trace buffer, restarting."
1704 " (prev=%08x, commit=%08x, readout=%08x)",
1705 prev
, commit
, readout
);
1709 /* Hold your horses here. Even if that change was committed,
1710 GDBserver could come in, and clobber it. We need to hold to be
1711 able to tell if GDBserver clobbers before or after we committed
1712 the change. Whenever GDBserver goes about touching the IPA
1713 buffer, it sets a breakpoint in this routine, so we have a sync
1715 about_to_request_buffer_space ();
1717 /* Check if the change has been effective, even if GDBserver stopped
1718 us at the breakpoint. */
1721 unsigned int refetch
;
1725 refetch
= trace_buffer_ctrl_curr
;
1727 if (refetch
== commit
1728 || ((refetch
& GDBSERVER_FLUSH_COUNT_MASK_PREV
) >> 12) == commit_count
)
1731 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1732 "readout=%08x, refetch=%08x)",
1733 prev
, commit
, readout
, refetch
);
1737 trace_debug ("GDBserver has touched the trace buffer, not effective."
1738 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1739 prev
, commit
, readout
, refetch
);
1745 /* We have a new piece of the trace buffer. Hurray! */
1747 /* Add an EOB marker just past this allocation. */
1748 ((struct traceframe
*) tbctrl
->free
)->tpnum
= 0;
1749 ((struct traceframe
*) tbctrl
->free
)->data_size
= 0;
1751 /* Adjust the request back down, now that we know we have space for
1753 amt
-= sizeof (struct traceframe
);
1757 trace_debug ("Allocated %d bytes", (int) amt
);
1758 trace_debug ("Trace buffer [%d] start=%d free=%d "
1759 "endfree=%d wrap=%d hi=%d",
1761 (int) (tbctrl
->start
- trace_buffer_lo
),
1762 (int) (tbctrl
->free
- trace_buffer_lo
),
1763 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1764 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1765 (int) (trace_buffer_hi
- trace_buffer_lo
));
1771 #ifndef IN_PROCESS_AGENT
1773 /* Return the total free space. This is not necessarily the largest
1774 block we can allocate, because of the two-part case. */
1779 if (trace_buffer_free
<= trace_buffer_end_free
)
1780 return trace_buffer_end_free
- trace_buffer_free
;
1782 return ((trace_buffer_end_free
- trace_buffer_lo
)
1783 + (trace_buffer_hi
- trace_buffer_free
));
1786 /* An 'S' in continuation packets indicates remainder are for
1789 static int seen_step_action_flag
;
1791 /* Create a tracepoint (location) with given number and address. Add this
1792 new tracepoint to list and sort this list. */
1794 static struct tracepoint
*
1795 add_tracepoint (int num
, CORE_ADDR addr
)
1797 struct tracepoint
*tpoint
, **tp_next
;
1799 tpoint
= XNEW (struct tracepoint
);
1800 tpoint
->number
= num
;
1801 tpoint
->address
= addr
;
1802 tpoint
->numactions
= 0;
1803 tpoint
->actions
= NULL
;
1804 tpoint
->actions_str
= NULL
;
1805 tpoint
->cond
= NULL
;
1806 tpoint
->num_step_actions
= 0;
1807 tpoint
->step_actions
= NULL
;
1808 tpoint
->step_actions_str
= NULL
;
1809 /* Start all off as regular (slow) tracepoints. */
1810 tpoint
->type
= trap_tracepoint
;
1811 tpoint
->orig_size
= -1;
1812 tpoint
->source_strings
= NULL
;
1813 tpoint
->compiled_cond
= 0;
1814 tpoint
->handle
= NULL
;
1815 tpoint
->next
= NULL
;
1817 /* Find a place to insert this tracepoint into list in order to keep
1818 the tracepoint list still in the ascending order. There may be
1819 multiple tracepoints at the same address as TPOINT's, and this
1820 guarantees TPOINT is inserted after all the tracepoints which are
1821 set at the same address. For example, fast tracepoints A, B, C are
1822 set at the same address, and D is to be insert at the same place as
1825 -->| A |--> | B |-->| C |->...
1827 One jump pad was created for tracepoint A, B, and C, and the target
1828 address of A is referenced/used in jump pad. So jump pad will let
1829 inferior jump to A. If D is inserted in front of A, like this,
1831 -->| D |-->| A |--> | B |-->| C |->...
1833 without updating jump pad, D is not reachable during collect, which
1834 is wrong. As we can see, the order of B, C and D doesn't matter, but
1835 A should always be the `first' one. */
1836 for (tp_next
= &tracepoints
;
1837 (*tp_next
) != NULL
&& (*tp_next
)->address
<= tpoint
->address
;
1838 tp_next
= &(*tp_next
)->next
)
1840 tpoint
->next
= *tp_next
;
1842 last_tracepoint
= tpoint
;
1844 seen_step_action_flag
= 0;
1849 #ifndef IN_PROCESS_AGENT
1851 /* Return the tracepoint with the given number and address, or NULL. */
1853 static struct tracepoint
*
1854 find_tracepoint (int id
, CORE_ADDR addr
)
1856 struct tracepoint
*tpoint
;
1858 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
1859 if (tpoint
->number
== id
&& tpoint
->address
== addr
)
1865 /* Remove TPOINT from global list. */
1868 remove_tracepoint (struct tracepoint
*tpoint
)
1870 struct tracepoint
*tp
, *tp_prev
;
1872 for (tp
= tracepoints
, tp_prev
= NULL
; tp
&& tp
!= tpoint
;
1873 tp_prev
= tp
, tp
= tp
->next
)
1879 tp_prev
->next
= tp
->next
;
1881 tracepoints
= tp
->next
;
1887 /* There may be several tracepoints with the same number (because they
1888 are "locations", in GDB parlance); return the next one after the
1889 given tracepoint, or search from the beginning of the list if the
1890 first argument is NULL. */
1892 static struct tracepoint
*
1893 find_next_tracepoint_by_number (struct tracepoint
*prev_tp
, int num
)
1895 struct tracepoint
*tpoint
;
1898 tpoint
= prev_tp
->next
;
1900 tpoint
= tracepoints
;
1901 for (; tpoint
; tpoint
= tpoint
->next
)
1902 if (tpoint
->number
== num
)
1910 /* Append another action to perform when the tracepoint triggers. */
1913 add_tracepoint_action (struct tracepoint
*tpoint
, const char *packet
)
1919 seen_step_action_flag
= 1;
1927 const char *act_start
= act
;
1928 struct tracepoint_action
*action
= NULL
;
1934 struct collect_memory_action
*maction
=
1935 XNEW (struct collect_memory_action
);
1939 maction
->base
.type
= *act
;
1940 action
= &maction
->base
;
1943 is_neg
= (*act
== '-');
1946 act
= unpack_varlen_hex (act
, &basereg
);
1948 act
= unpack_varlen_hex (act
, &maction
->addr
);
1950 act
= unpack_varlen_hex (act
, &maction
->len
);
1951 maction
->basereg
= (is_neg
1954 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
1955 pulongest (maction
->len
),
1956 paddress (maction
->addr
), maction
->basereg
);
1961 struct collect_registers_action
*raction
=
1962 XNEW (struct collect_registers_action
);
1964 raction
->base
.type
= *act
;
1965 action
= &raction
->base
;
1967 trace_debug ("Want to collect registers");
1969 /* skip past hex digits of mask for now */
1970 while (isxdigit(*act
))
1976 struct collect_static_trace_data_action
*raction
=
1977 XNEW (struct collect_static_trace_data_action
);
1979 raction
->base
.type
= *act
;
1980 action
= &raction
->base
;
1982 trace_debug ("Want to collect static trace data");
1987 trace_debug ("Unexpected step action, ignoring");
1992 struct eval_expr_action
*xaction
= XNEW (struct eval_expr_action
);
1994 xaction
->base
.type
= *act
;
1995 action
= &xaction
->base
;
1997 trace_debug ("Want to evaluate expression");
1998 xaction
->expr
= gdb_parse_agent_expr (&act
);
2002 trace_debug ("unknown trace action '%c', ignoring...", *act
);
2011 if (seen_step_action_flag
)
2013 tpoint
->num_step_actions
++;
2015 tpoint
->step_actions
2016 = XRESIZEVEC (struct tracepoint_action
*, tpoint
->step_actions
,
2017 tpoint
->num_step_actions
);
2018 tpoint
->step_actions_str
2019 = XRESIZEVEC (char *, tpoint
->step_actions_str
,
2020 tpoint
->num_step_actions
);
2021 tpoint
->step_actions
[tpoint
->num_step_actions
- 1] = action
;
2022 tpoint
->step_actions_str
[tpoint
->num_step_actions
- 1]
2023 = savestring (act_start
, act
- act_start
);
2027 tpoint
->numactions
++;
2029 = XRESIZEVEC (struct tracepoint_action
*, tpoint
->actions
,
2030 tpoint
->numactions
);
2032 = XRESIZEVEC (char *, tpoint
->actions_str
, tpoint
->numactions
);
2033 tpoint
->actions
[tpoint
->numactions
- 1] = action
;
2034 tpoint
->actions_str
[tpoint
->numactions
- 1]
2035 = savestring (act_start
, act
- act_start
);
2042 /* Find or create a trace state variable with the given number. */
2044 static struct trace_state_variable
*
2045 get_trace_state_variable (int num
)
2047 struct trace_state_variable
*tsv
;
2049 #ifdef IN_PROCESS_AGENT
2050 /* Search for an existing variable. */
2051 for (tsv
= alloced_trace_state_variables
; tsv
; tsv
= tsv
->next
)
2052 if (tsv
->number
== num
)
2056 /* Search for an existing variable. */
2057 for (tsv
= trace_state_variables
; tsv
; tsv
= tsv
->next
)
2058 if (tsv
->number
== num
)
2064 /* Find or create a trace state variable with the given number. */
2066 static struct trace_state_variable
*
2067 create_trace_state_variable (int num
, int gdb
)
2069 struct trace_state_variable
*tsv
;
2071 tsv
= get_trace_state_variable (num
);
2075 /* Create a new variable. */
2076 tsv
= XNEW (struct trace_state_variable
);
2078 tsv
->initial_value
= 0;
2082 #ifdef IN_PROCESS_AGENT
2085 tsv
->next
= alloced_trace_state_variables
;
2086 alloced_trace_state_variables
= tsv
;
2091 tsv
->next
= trace_state_variables
;
2092 trace_state_variables
= tsv
;
2097 IP_AGENT_EXPORT_FUNC LONGEST
2098 get_trace_state_variable_value (int num
)
2100 struct trace_state_variable
*tsv
;
2102 tsv
= get_trace_state_variable (num
);
2106 trace_debug ("No trace state variable %d, skipping value get", num
);
2110 /* Call a getter function if we have one. While it's tempting to
2111 set up something to only call the getter once per tracepoint hit,
2112 it could run afoul of thread races. Better to let the getter
2113 handle it directly, if necessary to worry about it. */
2115 tsv
->value
= (tsv
->getter
) ();
2117 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2118 num
, plongest (tsv
->value
));
2123 IP_AGENT_EXPORT_FUNC
void
2124 set_trace_state_variable_value (int num
, LONGEST val
)
2126 struct trace_state_variable
*tsv
;
2128 tsv
= get_trace_state_variable (num
);
2132 trace_debug ("No trace state variable %d, skipping value set", num
);
2140 agent_get_trace_state_variable_value (int num
)
2142 return get_trace_state_variable_value (num
);
2146 agent_set_trace_state_variable_value (int num
, LONGEST val
)
2148 set_trace_state_variable_value (num
, val
);
2152 set_trace_state_variable_name (int num
, const char *name
)
2154 struct trace_state_variable
*tsv
;
2156 tsv
= get_trace_state_variable (num
);
2160 trace_debug ("No trace state variable %d, skipping name set", num
);
2164 tsv
->name
= (char *) name
;
2168 set_trace_state_variable_getter (int num
, LONGEST (*getter
) (void))
2170 struct trace_state_variable
*tsv
;
2172 tsv
= get_trace_state_variable (num
);
2176 trace_debug ("No trace state variable %d, skipping getter set", num
);
2180 tsv
->getter
= getter
;
2183 /* Add a raw traceframe for the given tracepoint. */
2185 static struct traceframe
*
2186 add_traceframe (struct tracepoint
*tpoint
)
2188 struct traceframe
*tframe
;
2191 = (struct traceframe
*) trace_buffer_alloc (sizeof (struct traceframe
));
2196 tframe
->tpnum
= tpoint
->number
;
2197 tframe
->data_size
= 0;
2202 /* Add a block to the traceframe currently being worked on. */
2204 static unsigned char *
2205 add_traceframe_block (struct traceframe
*tframe
,
2206 struct tracepoint
*tpoint
, int amt
)
2208 unsigned char *block
;
2213 block
= (unsigned char *) trace_buffer_alloc (amt
);
2218 gdb_assert (tframe
->tpnum
== tpoint
->number
);
2220 tframe
->data_size
+= amt
;
2221 tpoint
->traceframe_usage
+= amt
;
2226 /* Flag that the current traceframe is finished. */
2229 finish_traceframe (struct traceframe
*tframe
)
2231 ++traceframe_write_count
;
2232 ++traceframes_created
;
2235 #ifndef IN_PROCESS_AGENT
2237 /* Given a traceframe number NUM, find the NUMth traceframe in the
2240 static struct traceframe
*
2241 find_traceframe (int num
)
2243 struct traceframe
*tframe
;
2246 for (tframe
= FIRST_TRACEFRAME ();
2248 tframe
= NEXT_TRACEFRAME (tframe
))
2259 get_traceframe_address (struct traceframe
*tframe
)
2262 struct tracepoint
*tpoint
;
2264 addr
= traceframe_get_pc (tframe
);
2269 /* Fallback strategy, will be incorrect for while-stepping frames
2270 and multi-location tracepoints. */
2271 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2272 return tpoint
->address
;
2275 /* Search for the next traceframe whose address is inside or outside
2278 static struct traceframe
*
2279 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2282 struct traceframe
*tframe
;
2285 *tfnump
= current_traceframe
+ 1;
2286 tframe
= find_traceframe (*tfnump
);
2287 /* The search is not supposed to wrap around. */
2294 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2296 tfaddr
= get_traceframe_address (tframe
);
2298 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2299 : (lo
> tfaddr
|| tfaddr
> hi
))
2308 /* Search for the next traceframe recorded by the given tracepoint.
2309 Note that for multi-location tracepoints, this will find whatever
2310 location appears first. */
2312 static struct traceframe
*
2313 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2315 struct traceframe
*tframe
;
2317 *tfnump
= current_traceframe
+ 1;
2318 tframe
= find_traceframe (*tfnump
);
2319 /* The search is not supposed to wrap around. */
2326 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2328 if (tframe
->tpnum
== num
)
2339 #ifndef IN_PROCESS_AGENT
2341 /* Clear all past trace state. */
2344 cmd_qtinit (char *packet
)
2346 struct trace_state_variable
*tsv
, *prev
, *next
;
2348 /* Can't do this command without a pid attached. */
2349 if (current_thread
== NULL
)
2355 /* Make sure we don't try to read from a trace frame. */
2356 current_traceframe
= -1;
2360 trace_debug ("Initializing the trace");
2362 clear_installed_tracepoints ();
2363 clear_readonly_regions ();
2366 last_tracepoint
= NULL
;
2368 /* Clear out any leftover trace state variables. Ones with target
2369 defined getters should be kept however. */
2371 tsv
= trace_state_variables
;
2374 trace_debug ("Looking at var %d", tsv
->number
);
2375 if (tsv
->getter
== NULL
)
2381 trace_state_variables
= next
;
2382 trace_debug ("Deleting var %d", tsv
->number
);
2393 clear_trace_buffer ();
2394 clear_inferior_trace_buffer ();
2399 /* Unprobe the UST marker at ADDRESS. */
2402 unprobe_marker_at (CORE_ADDR address
)
2404 char cmd
[IPA_CMD_BUF_SIZE
];
2406 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2407 run_inferior_command (cmd
, strlen (cmd
) + 1);
2410 /* Restore the program to its pre-tracing state. This routine may be called
2411 in error situations, so it needs to be careful about only restoring
2412 from known-valid bits. */
2415 clear_installed_tracepoints (void)
2417 struct tracepoint
*tpoint
;
2418 struct tracepoint
*prev_stpoint
;
2422 prev_stpoint
= NULL
;
2424 /* Restore any bytes overwritten by tracepoints. */
2425 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2427 /* Catch the case where we might try to remove a tracepoint that
2428 was never actually installed. */
2429 if (tpoint
->handle
== NULL
)
2431 trace_debug ("Tracepoint %d at 0x%s was "
2432 "never installed, nothing to clear",
2433 tpoint
->number
, paddress (tpoint
->address
));
2437 switch (tpoint
->type
)
2439 case trap_tracepoint
:
2441 struct breakpoint
*bp
2442 = (struct breakpoint
*) tpoint
->handle
;
2444 delete_breakpoint (bp
);
2447 case fast_tracepoint
:
2449 struct fast_tracepoint_jump
*jump
2450 = (struct fast_tracepoint_jump
*) tpoint
->handle
;
2452 delete_fast_tracepoint_jump (jump
);
2455 case static_tracepoint
:
2456 if (prev_stpoint
!= NULL
2457 && prev_stpoint
->address
== tpoint
->address
)
2458 /* Nothing to do. We already unprobed a tracepoint set at
2459 this marker address (and there can only be one probe
2464 unprobe_marker_at (tpoint
->address
);
2465 prev_stpoint
= tpoint
;
2470 tpoint
->handle
= NULL
;
2476 /* Parse a packet that defines a tracepoint. */
2479 cmd_qtdp (char *own_buf
)
2482 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2483 int trail_hyphen
= 0;
2487 struct tracepoint
*tpoint
;
2488 const char *packet
= own_buf
;
2490 packet
+= strlen ("QTDP:");
2492 /* A hyphen at the beginning marks a packet specifying actions for a
2493 tracepoint already supplied. */
2500 packet
= unpack_varlen_hex (packet
, &num
);
2501 ++packet
; /* skip a colon */
2502 packet
= unpack_varlen_hex (packet
, &addr
);
2503 ++packet
; /* skip a colon */
2505 /* See if we already have this tracepoint. */
2506 tpoint
= find_tracepoint (num
, addr
);
2510 /* Duplicate tracepoints are never allowed. */
2513 trace_debug ("Tracepoint error: tracepoint %d"
2514 " at 0x%s already exists",
2515 (int) num
, paddress (addr
));
2516 write_enn (own_buf
);
2520 tpoint
= add_tracepoint (num
, addr
);
2522 tpoint
->enabled
= (*packet
== 'E');
2523 ++packet
; /* skip 'E' */
2524 ++packet
; /* skip a colon */
2525 packet
= unpack_varlen_hex (packet
, &count
);
2526 tpoint
->step_count
= count
;
2527 ++packet
; /* skip a colon */
2528 packet
= unpack_varlen_hex (packet
, &count
);
2529 tpoint
->pass_count
= count
;
2530 /* See if we have any of the additional optional fields. */
2531 while (*packet
== ':')
2536 tpoint
->type
= fast_tracepoint
;
2538 packet
= unpack_varlen_hex (packet
, &count
);
2539 tpoint
->orig_size
= count
;
2541 else if (*packet
== 'S')
2543 tpoint
->type
= static_tracepoint
;
2546 else if (*packet
== 'X')
2548 tpoint
->cond
= gdb_parse_agent_expr (&packet
);
2550 else if (*packet
== '-')
2552 else if (*packet
== '\0')
2555 trace_debug ("Unknown optional tracepoint field");
2560 trace_debug ("Also has actions\n");
2563 trace_debug ("Defined %stracepoint %d at 0x%s, "
2564 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2565 tpoint
->type
== fast_tracepoint
? "fast "
2566 : tpoint
->type
== static_tracepoint
? "static " : "",
2567 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2568 tpoint
->step_count
, tpoint
->pass_count
);
2571 add_tracepoint_action (tpoint
, packet
);
2574 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2575 (int) num
, paddress (addr
));
2576 write_enn (own_buf
);
2580 /* Install tracepoint during tracing only once for each tracepoint location.
2581 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2582 determine the last QTDP packet for one tracepoint location by checking
2583 trailing hyphen in QTDP packet. */
2584 if (tracing
&& !trail_hyphen
)
2586 struct tracepoint
*tp
= NULL
;
2588 /* Pause all threads temporarily while we patch tracepoints. */
2591 /* download_tracepoint will update global `tracepoints'
2592 list, so it is unsafe to leave threads in jump pad. */
2593 stabilize_threads ();
2595 /* Freeze threads. */
2599 if (tpoint
->type
!= trap_tracepoint
)
2601 /* Find another fast or static tracepoint at the same address. */
2602 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2604 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2605 && tp
->number
!= tpoint
->number
)
2609 /* TPOINT is installed at the same address as TP. */
2612 if (tpoint
->type
== fast_tracepoint
)
2613 clone_fast_tracepoint (tpoint
, tp
);
2614 else if (tpoint
->type
== static_tracepoint
)
2615 tpoint
->handle
= (void *) -1;
2619 if (use_agent
&& tpoint
->type
== fast_tracepoint
2620 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2622 /* Download and install fast tracepoint by agent. */
2623 if (tracepoint_send_agent (tpoint
) == 0)
2627 write_enn (own_buf
);
2628 remove_tracepoint (tpoint
);
2633 download_tracepoint (tpoint
);
2635 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2637 install_tracepoint (tpoint
, own_buf
);
2638 if (strcmp (own_buf
, "OK") != 0)
2639 remove_tracepoint (tpoint
);
2653 cmd_qtdpsrc (char *own_buf
)
2655 ULONGEST num
, addr
, start
, slen
;
2656 struct tracepoint
*tpoint
;
2657 const char *packet
= own_buf
;
2659 char *srctype
, *src
;
2661 struct source_string
*last
, *newlast
;
2663 packet
+= strlen ("QTDPsrc:");
2665 packet
= unpack_varlen_hex (packet
, &num
);
2666 ++packet
; /* skip a colon */
2667 packet
= unpack_varlen_hex (packet
, &addr
);
2668 ++packet
; /* skip a colon */
2670 /* See if we already have this tracepoint. */
2671 tpoint
= find_tracepoint (num
, addr
);
2675 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2676 (int) num
, paddress (addr
));
2677 write_enn (own_buf
);
2682 packet
= strchr (packet
, ':');
2683 srctype
= (char *) xmalloc (packet
- saved
+ 1);
2684 memcpy (srctype
, saved
, packet
- saved
);
2685 srctype
[packet
- saved
] = '\0';
2687 packet
= unpack_varlen_hex (packet
, &start
);
2688 ++packet
; /* skip a colon */
2689 packet
= unpack_varlen_hex (packet
, &slen
);
2690 ++packet
; /* skip a colon */
2691 src
= (char *) xmalloc (slen
+ 1);
2692 nbytes
= hex2bin (packet
, (gdb_byte
*) src
, strlen (packet
) / 2);
2695 newlast
= XNEW (struct source_string
);
2696 newlast
->type
= srctype
;
2698 newlast
->next
= NULL
;
2699 /* Always add a source string to the end of the list;
2700 this keeps sequences of actions/commands in the right
2702 if (tpoint
->source_strings
)
2704 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2706 last
->next
= newlast
;
2709 tpoint
->source_strings
= newlast
;
2715 cmd_qtdv (char *own_buf
)
2717 ULONGEST num
, val
, builtin
;
2720 struct trace_state_variable
*tsv
;
2721 const char *packet
= own_buf
;
2723 packet
+= strlen ("QTDV:");
2725 packet
= unpack_varlen_hex (packet
, &num
);
2726 ++packet
; /* skip a colon */
2727 packet
= unpack_varlen_hex (packet
, &val
);
2728 ++packet
; /* skip a colon */
2729 packet
= unpack_varlen_hex (packet
, &builtin
);
2730 ++packet
; /* skip a colon */
2732 nbytes
= strlen (packet
) / 2;
2733 varname
= (char *) xmalloc (nbytes
+ 1);
2734 nbytes
= hex2bin (packet
, (gdb_byte
*) varname
, nbytes
);
2735 varname
[nbytes
] = '\0';
2737 tsv
= create_trace_state_variable (num
, 1);
2738 tsv
->initial_value
= (LONGEST
) val
;
2739 tsv
->name
= varname
;
2741 set_trace_state_variable_value (num
, (LONGEST
) val
);
2747 cmd_qtenable_disable (char *own_buf
, int enable
)
2749 const char *packet
= own_buf
;
2751 struct tracepoint
*tp
;
2753 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2754 packet
= unpack_varlen_hex (packet
, &num
);
2755 ++packet
; /* skip a colon */
2756 packet
= unpack_varlen_hex (packet
, &addr
);
2758 tp
= find_tracepoint (num
, addr
);
2762 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2764 trace_debug ("Tracepoint %d at 0x%s is already %s",
2765 (int) num
, paddress (addr
),
2766 enable
? "enabled" : "disabled");
2771 trace_debug ("%s tracepoint %d at 0x%s",
2772 enable
? "Enabling" : "Disabling",
2773 (int) num
, paddress (addr
));
2775 tp
->enabled
= enable
;
2777 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2780 int offset
= offsetof (struct tracepoint
, enabled
);
2781 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2783 ret
= prepare_to_access_memory ();
2786 trace_debug ("Failed to temporarily stop inferior threads");
2787 write_enn (own_buf
);
2791 ret
= write_inferior_int8 (obj_addr
, enable
);
2792 done_accessing_memory ();
2796 trace_debug ("Cannot write enabled flag into "
2797 "inferior process memory");
2798 write_enn (own_buf
);
2807 trace_debug ("Tracepoint %d at 0x%s not found",
2808 (int) num
, paddress (addr
));
2809 write_enn (own_buf
);
2814 cmd_qtv (char *own_buf
)
2819 char *packet
= own_buf
;
2821 packet
+= strlen ("qTV:");
2822 unpack_varlen_hex (packet
, &num
);
2824 if (current_traceframe
>= 0)
2826 err
= traceframe_read_tsv ((int) num
, &val
);
2829 strcpy (own_buf
, "U");
2833 /* Only make tsv's be undefined before the first trace run. After a
2834 trace run is over, the user might want to see the last value of
2835 the tsv, and it might not be available in a traceframe. */
2836 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2838 strcpy (own_buf
, "U");
2842 val
= get_trace_state_variable_value (num
);
2844 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2847 /* Clear out the list of readonly regions. */
2850 clear_readonly_regions (void)
2852 struct readonly_region
*roreg
;
2854 while (readonly_regions
)
2856 roreg
= readonly_regions
;
2857 readonly_regions
= readonly_regions
->next
;
2862 /* Parse the collection of address ranges whose contents GDB believes
2863 to be unchanging and so can be read directly from target memory
2864 even while looking at a traceframe. */
2867 cmd_qtro (char *own_buf
)
2869 ULONGEST start
, end
;
2870 struct readonly_region
*roreg
;
2871 const char *packet
= own_buf
;
2873 trace_debug ("Want to mark readonly regions");
2875 clear_readonly_regions ();
2877 packet
+= strlen ("QTro");
2879 while (*packet
== ':')
2881 ++packet
; /* skip a colon */
2882 packet
= unpack_varlen_hex (packet
, &start
);
2883 ++packet
; /* skip a comma */
2884 packet
= unpack_varlen_hex (packet
, &end
);
2886 roreg
= XNEW (struct readonly_region
);
2887 roreg
->start
= start
;
2889 roreg
->next
= readonly_regions
;
2890 readonly_regions
= roreg
;
2891 trace_debug ("Added readonly region from 0x%s to 0x%s",
2892 paddress (roreg
->start
), paddress (roreg
->end
));
2898 /* Test to see if the given range is in our list of readonly ranges.
2899 We only test for being entirely within a range, GDB is not going to
2900 send a single memory packet that spans multiple regions. */
2903 in_readonly_region (CORE_ADDR addr
, ULONGEST length
)
2905 struct readonly_region
*roreg
;
2907 for (roreg
= readonly_regions
; roreg
; roreg
= roreg
->next
)
2908 if (roreg
->start
<= addr
&& (addr
+ length
- 1) <= roreg
->end
)
2914 static CORE_ADDR gdb_jump_pad_head
;
2916 /* Return the address of the next free jump space. */
2919 get_jump_space_head (void)
2921 if (gdb_jump_pad_head
== 0)
2923 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2924 &gdb_jump_pad_head
))
2926 internal_error (__FILE__
, __LINE__
,
2927 "error extracting jump_pad_buffer");
2931 return gdb_jump_pad_head
;
2934 /* Reserve USED bytes from the jump space. */
2937 claim_jump_space (ULONGEST used
)
2939 trace_debug ("claim_jump_space reserves %s bytes at %s",
2940 pulongest (used
), paddress (gdb_jump_pad_head
));
2941 gdb_jump_pad_head
+= used
;
2944 static CORE_ADDR trampoline_buffer_head
= 0;
2945 static CORE_ADDR trampoline_buffer_tail
;
2947 /* Reserve USED bytes from the trampoline buffer and return the
2948 address of the start of the reserved space in TRAMPOLINE. Returns
2949 non-zero if the space is successfully claimed. */
2952 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2954 if (!trampoline_buffer_head
)
2956 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2957 &trampoline_buffer_tail
))
2959 internal_error (__FILE__
, __LINE__
,
2960 "error extracting trampoline_buffer");
2963 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2964 &trampoline_buffer_head
))
2966 internal_error (__FILE__
, __LINE__
,
2967 "error extracting trampoline_buffer_end");
2971 /* Start claiming space from the top of the trampoline space. If
2972 the space is located at the bottom of the virtual address space,
2973 this reduces the possibility that corruption will occur if a null
2974 pointer is used to write to memory. */
2975 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2977 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2982 trampoline_buffer_head
-= used
;
2984 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2985 pulongest (used
), paddress (trampoline_buffer_head
));
2987 *trampoline
= trampoline_buffer_head
;
2991 /* Returns non-zero if there is space allocated for use in trampolines
2992 for fast tracepoints. */
2995 have_fast_tracepoint_trampoline_buffer (char *buf
)
2997 CORE_ADDR trampoline_end
, errbuf
;
2999 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
3002 internal_error (__FILE__
, __LINE__
,
3003 "error extracting trampoline_buffer_end");
3009 strcpy (buf
, "was claiming");
3010 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3013 internal_error (__FILE__
, __LINE__
,
3014 "error extracting errbuf");
3017 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3020 return trampoline_end
!= 0;
3023 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3024 the command fails, or 0 otherwise. If the command ran
3025 successfully, but probing the marker failed, ERROUT will be filled
3026 with the error to reply to GDB, and -1 is also returned. This
3027 allows directly passing IPA errors to GDB. */
3030 probe_marker_at (CORE_ADDR address
, char *errout
)
3032 char cmd
[IPA_CMD_BUF_SIZE
];
3035 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3036 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3042 strcpy (errout
, cmd
);
3051 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3053 to
->jump_pad
= from
->jump_pad
;
3054 to
->jump_pad_end
= from
->jump_pad_end
;
3055 to
->trampoline
= from
->trampoline
;
3056 to
->trampoline_end
= from
->trampoline_end
;
3057 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3058 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3059 to
->handle
= from
->handle
;
3061 gdb_assert (from
->handle
);
3062 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3065 #define MAX_JUMP_SIZE 20
3067 /* Install fast tracepoint. Return 0 if successful, otherwise return
3071 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3073 CORE_ADDR jentry
, jump_entry
;
3074 CORE_ADDR trampoline
;
3076 ULONGEST trampoline_size
;
3078 /* The jump to the jump pad of the last fast tracepoint
3080 unsigned char fjump
[MAX_JUMP_SIZE
];
3081 ULONGEST fjump_size
;
3083 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3085 trace_debug ("Requested a fast tracepoint on an instruction "
3086 "that is of less than the minimum length.");
3090 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_collect_ptr
,
3093 error ("error extracting gdb_collect_ptr");
3097 jentry
= jump_entry
= get_jump_space_head ();
3100 trampoline_size
= 0;
3102 /* Install the jump pad. */
3103 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3106 ipa_sym_addrs
.addr_collecting
,
3109 &trampoline
, &trampoline_size
,
3111 &tpoint
->adjusted_insn_addr
,
3112 &tpoint
->adjusted_insn_addr_end
,
3119 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3122 if (tpoint
->handle
!= NULL
)
3124 tpoint
->jump_pad
= jump_entry
;
3125 tpoint
->jump_pad_end
= jentry
;
3126 tpoint
->trampoline
= trampoline
;
3127 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3129 /* Pad to 8-byte alignment. */
3130 jentry
= ((jentry
+ 7) & ~0x7);
3131 claim_jump_space (jentry
- jump_entry
);
3138 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3141 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3143 tpoint
->handle
= NULL
;
3146 if (tpoint
->type
== trap_tracepoint
)
3148 /* Tracepoints are installed as memory breakpoints. Just go
3149 ahead and install the trap. The breakpoints module
3150 handles duplicated breakpoints, and the memory read
3151 routine handles un-patching traps from memory reads. */
3152 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3153 tracepoint_handler
);
3155 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3157 if (!agent_loaded_p ())
3159 trace_debug ("Requested a %s tracepoint, but fast "
3160 "tracepoints aren't supported.",
3161 tpoint
->type
== static_tracepoint
? "static" : "fast");
3162 write_e_ipa_not_loaded (own_buf
);
3165 if (tpoint
->type
== static_tracepoint
3166 && !in_process_agent_supports_ust ())
3168 trace_debug ("Requested a static tracepoint, but static "
3169 "tracepoints are not supported.");
3170 write_e_ust_not_loaded (own_buf
);
3174 if (tpoint
->type
== fast_tracepoint
)
3175 install_fast_tracepoint (tpoint
, own_buf
);
3178 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3179 tpoint
->handle
= (void *) -1;
3184 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3186 if (tpoint
->handle
== NULL
)
3188 if (*own_buf
== '\0')
3189 write_enn (own_buf
);
3195 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3198 cmd_qtstart (char *packet
)
3200 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3201 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3203 trace_debug ("Starting the trace");
3205 /* Pause all threads temporarily while we patch tracepoints. */
3208 /* Get threads out of jump pads. Safe to do here, since this is a
3209 top level command. And, required to do here, since we're
3210 deleting/rewriting jump pads. */
3212 stabilize_threads ();
3214 /* Freeze threads. */
3217 /* Sync the fast tracepoints list in the inferior ftlib. */
3218 if (agent_loaded_p ())
3219 download_trace_state_variables ();
3221 /* No previous fast tpoint yet. */
3222 prev_ftpoint
= NULL
;
3224 /* No previous static tpoint yet. */
3225 prev_stpoint
= NULL
;
3229 if (agent_loaded_p ())
3231 /* Tell IPA about the correct tdesc. */
3232 if (write_inferior_integer (ipa_sym_addrs
.addr_ipa_tdesc_idx
,
3233 target_get_ipa_tdesc_idx ()))
3234 error ("Error setting ipa_tdesc_idx variable in lib");
3237 /* Start out empty. */
3238 if (agent_loaded_p ())
3239 write_inferior_data_pointer (ipa_sym_addrs
.addr_tracepoints
, 0);
3241 /* Download and install tracepoints. */
3242 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3244 /* Ensure all the hit counts start at zero. */
3245 tpoint
->hit_count
= 0;
3246 tpoint
->traceframe_usage
= 0;
3248 if (tpoint
->type
== trap_tracepoint
)
3250 /* Tracepoints are installed as memory breakpoints. Just go
3251 ahead and install the trap. The breakpoints module
3252 handles duplicated breakpoints, and the memory read
3253 routine handles un-patching traps from memory reads. */
3254 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3255 tracepoint_handler
);
3257 else if (tpoint
->type
== fast_tracepoint
3258 || tpoint
->type
== static_tracepoint
)
3260 if (maybe_write_ipa_not_loaded (packet
))
3262 trace_debug ("Requested a %s tracepoint, but fast "
3263 "tracepoints aren't supported.",
3264 tpoint
->type
== static_tracepoint
3265 ? "static" : "fast");
3269 if (tpoint
->type
== fast_tracepoint
)
3272 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3274 if (prev_ftpoint
!= NULL
3275 && prev_ftpoint
->address
== tpoint
->address
)
3278 tracepoint_send_agent (tpoint
);
3280 download_tracepoint_1 (tpoint
);
3282 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3286 /* Tracepoint is installed successfully? */
3289 /* Download and install fast tracepoint by agent. */
3291 installed
= !tracepoint_send_agent (tpoint
);
3294 download_tracepoint_1 (tpoint
);
3295 installed
= !install_fast_tracepoint (tpoint
, packet
);
3299 prev_ftpoint
= tpoint
;
3304 if (!in_process_agent_supports_ust ())
3306 trace_debug ("Requested a static tracepoint, but static "
3307 "tracepoints are not supported.");
3311 download_tracepoint_1 (tpoint
);
3312 /* Can only probe a given marker once. */
3313 if (prev_stpoint
!= NULL
3314 && prev_stpoint
->address
== tpoint
->address
)
3315 tpoint
->handle
= (void *) -1;
3318 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3320 tpoint
->handle
= (void *) -1;
3322 /* So that we can handle multiple static tracepoints
3323 at the same address easily. */
3324 prev_stpoint
= tpoint
;
3330 tpptr
= tpoint
->obj_addr_on_target
;
3332 if (tpoint
== tracepoints
)
3333 /* First object in list, set the head pointer in the
3335 write_inferior_data_pointer (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3337 write_inferior_data_pointer (prev_tpptr
3338 + offsetof (struct tracepoint
, next
),
3342 /* Any failure in the inner loop is sufficient cause to give
3344 if (tpoint
->handle
== NULL
)
3348 /* Any error in tracepoint insertion is unacceptable; better to
3349 address the problem now, than end up with a useless or misleading
3353 clear_installed_tracepoints ();
3354 if (*packet
== '\0')
3360 stopping_tracepoint
= NULL
;
3361 trace_buffer_is_full
= 0;
3362 expr_eval_result
= expr_eval_no_error
;
3363 error_tracepoint
= NULL
;
3364 tracing_start_time
= get_timestamp ();
3366 /* Tracing is now active, hits will now start being logged. */
3369 if (agent_loaded_p ())
3371 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3373 internal_error (__FILE__
, __LINE__
,
3374 "Error setting tracing variable in lib");
3377 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3380 internal_error (__FILE__
, __LINE__
,
3381 "Error clearing stopping_tracepoint variable"
3385 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3387 internal_error (__FILE__
, __LINE__
,
3388 "Error clearing trace_buffer_is_full variable"
3392 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3393 stop_tracing_handler
);
3394 if (stop_tracing_bkpt
== NULL
)
3395 error ("Error setting stop_tracing breakpoint");
3397 flush_trace_buffer_bkpt
3398 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3399 flush_trace_buffer_handler
);
3400 if (flush_trace_buffer_bkpt
== NULL
)
3401 error ("Error setting flush_trace_buffer breakpoint");
3409 /* End a tracing run, filling in a stop reason to report back to GDB,
3410 and removing the tracepoints from the code. */
3417 trace_debug ("Tracing is already off, ignoring");
3421 trace_debug ("Stopping the trace");
3423 /* Pause all threads before removing fast jumps from memory,
3424 breakpoints, and touching IPA state variables (inferior memory).
3425 Some thread may hit the internal tracing breakpoints, or be
3426 collecting this moment, but that's ok, we don't release the
3427 tpoint object's memory or the jump pads here (we only do that
3428 when we're sure we can move all threads out of the jump pads).
3429 We can't now, since we may be getting here due to the inferior
3430 agent calling us. */
3433 /* Stop logging. Tracepoints can still be hit, but they will not be
3436 if (agent_loaded_p ())
3438 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3440 internal_error (__FILE__
, __LINE__
,
3441 "Error clearing tracing variable in lib");
3445 tracing_stop_time
= get_timestamp ();
3446 tracing_stop_reason
= "t???";
3447 tracing_stop_tpnum
= 0;
3448 if (stopping_tracepoint
)
3450 trace_debug ("Stopping the trace because "
3451 "tracepoint %d was hit %" PRIu64
" times",
3452 stopping_tracepoint
->number
,
3453 stopping_tracepoint
->pass_count
);
3454 tracing_stop_reason
= "tpasscount";
3455 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3457 else if (trace_buffer_is_full
)
3459 trace_debug ("Stopping the trace because the trace buffer is full");
3460 tracing_stop_reason
= "tfull";
3462 else if (expr_eval_result
!= expr_eval_no_error
)
3464 trace_debug ("Stopping the trace because of an expression eval error");
3465 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3466 tracing_stop_tpnum
= error_tracepoint
->number
;
3468 #ifndef IN_PROCESS_AGENT
3469 else if (!gdb_connected ())
3471 trace_debug ("Stopping the trace because GDB disconnected");
3472 tracing_stop_reason
= "tdisconnected";
3477 trace_debug ("Stopping the trace because of a tstop command");
3478 tracing_stop_reason
= "tstop";
3481 stopping_tracepoint
= NULL
;
3482 error_tracepoint
= NULL
;
3484 /* Clear out the tracepoints. */
3485 clear_installed_tracepoints ();
3487 if (agent_loaded_p ())
3489 /* Pull in fast tracepoint trace frames from the inferior lib
3490 buffer into our buffer, even if our buffer is already full,
3491 because we want to present the full number of created frames
3492 in addition to what fit in the trace buffer. */
3493 upload_fast_traceframes ();
3496 if (stop_tracing_bkpt
!= NULL
)
3498 delete_breakpoint (stop_tracing_bkpt
);
3499 stop_tracing_bkpt
= NULL
;
3502 if (flush_trace_buffer_bkpt
!= NULL
)
3504 delete_breakpoint (flush_trace_buffer_bkpt
);
3505 flush_trace_buffer_bkpt
= NULL
;
3512 stop_tracing_handler (CORE_ADDR addr
)
3514 trace_debug ("lib hit stop_tracing");
3516 /* Don't actually handle it here. When we stop tracing we remove
3517 breakpoints from the inferior, and that is not allowed in a
3518 breakpoint handler (as the caller is walking the breakpoint
3524 flush_trace_buffer_handler (CORE_ADDR addr
)
3526 trace_debug ("lib hit flush_trace_buffer");
3531 cmd_qtstop (char *packet
)
3538 cmd_qtdisconnected (char *own_buf
)
3541 char *packet
= own_buf
;
3543 packet
+= strlen ("QTDisconnected:");
3545 unpack_varlen_hex (packet
, &setting
);
3549 disconnected_tracing
= setting
;
3553 cmd_qtframe (char *own_buf
)
3555 ULONGEST frame
, pc
, lo
, hi
, num
;
3557 struct traceframe
*tframe
;
3558 const char *packet
= own_buf
;
3560 packet
+= strlen ("QTFrame:");
3562 if (startswith (packet
, "pc:"))
3564 packet
+= strlen ("pc:");
3565 unpack_varlen_hex (packet
, &pc
);
3566 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3567 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3569 else if (startswith (packet
, "range:"))
3571 packet
+= strlen ("range:");
3572 packet
= unpack_varlen_hex (packet
, &lo
);
3574 unpack_varlen_hex (packet
, &hi
);
3575 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3576 paddress (lo
), paddress (hi
));
3577 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3579 else if (startswith (packet
, "outside:"))
3581 packet
+= strlen ("outside:");
3582 packet
= unpack_varlen_hex (packet
, &lo
);
3584 unpack_varlen_hex (packet
, &hi
);
3585 trace_debug ("Want to find next traceframe "
3586 "outside the range 0x%s to 0x%s",
3587 paddress (lo
), paddress (hi
));
3588 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3590 else if (startswith (packet
, "tdp:"))
3592 packet
+= strlen ("tdp:");
3593 unpack_varlen_hex (packet
, &num
);
3595 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3596 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3600 unpack_varlen_hex (packet
, &frame
);
3601 tfnum
= (int) frame
;
3604 trace_debug ("Want to stop looking at traceframes");
3605 current_traceframe
= -1;
3609 trace_debug ("Want to look at traceframe %d", tfnum
);
3610 tframe
= find_traceframe (tfnum
);
3615 current_traceframe
= tfnum
;
3616 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3619 sprintf (own_buf
, "F-1");
3623 cmd_qtstatus (char *packet
)
3625 char *stop_reason_rsp
= NULL
;
3626 char *buf1
, *buf2
, *buf3
;
3630 /* Translate the plain text of the notes back into hex for
3633 str
= (tracing_user_name
? tracing_user_name
: "");
3634 slen
= strlen (str
);
3635 buf1
= (char *) alloca (slen
* 2 + 1);
3636 bin2hex ((gdb_byte
*) str
, buf1
, slen
);
3638 str
= (tracing_notes
? tracing_notes
: "");
3639 slen
= strlen (str
);
3640 buf2
= (char *) alloca (slen
* 2 + 1);
3641 bin2hex ((gdb_byte
*) str
, buf2
, slen
);
3643 str
= (tracing_stop_note
? tracing_stop_note
: "");
3644 slen
= strlen (str
);
3645 buf3
= (char *) alloca (slen
* 2 + 1);
3646 bin2hex ((gdb_byte
*) str
, buf3
, slen
);
3648 trace_debug ("Returning trace status as %d, stop reason %s",
3649 tracing
, tracing_stop_reason
);
3651 if (agent_loaded_p ())
3655 upload_fast_traceframes ();
3660 stop_reason_rsp
= (char *) tracing_stop_reason
;
3662 /* The user visible error string in terror needs to be hex encoded.
3663 We leave it as plain string in `tracing_stop_reason' to ease
3665 if (startswith (stop_reason_rsp
, "terror:"))
3667 const char *result_name
;
3671 result_name
= stop_reason_rsp
+ strlen ("terror:");
3672 hexstr_len
= strlen (result_name
) * 2;
3674 = (char *) alloca (strlen ("terror:") + hexstr_len
+ 1);
3675 strcpy (p
, "terror:");
3677 bin2hex ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3680 /* If this was a forced stop, include any stop note that was supplied. */
3681 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3683 stop_reason_rsp
= (char *) alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3684 strcpy (stop_reason_rsp
, "tstop:");
3685 strcat (stop_reason_rsp
, buf3
);
3691 "tframes:%x;tcreated:%x;"
3692 "tfree:%x;tsize:%s;"
3695 "starttime:%s;stoptime:%s;"
3696 "username:%s;notes:%s:",
3698 stop_reason_rsp
, tracing_stop_tpnum
,
3699 traceframe_count
, traceframes_created
,
3700 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3701 circular_trace_buffer
,
3702 disconnected_tracing
,
3703 phex_nz (tracing_start_time
, sizeof (tracing_start_time
)),
3704 phex_nz (tracing_stop_time
, sizeof (tracing_stop_time
)),
3709 cmd_qtp (char *own_buf
)
3712 struct tracepoint
*tpoint
;
3713 const char *packet
= own_buf
;
3715 packet
+= strlen ("qTP:");
3717 packet
= unpack_varlen_hex (packet
, &num
);
3718 ++packet
; /* skip a colon */
3719 packet
= unpack_varlen_hex (packet
, &addr
);
3721 /* See if we already have this tracepoint. */
3722 tpoint
= find_tracepoint (num
, addr
);
3726 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3727 (int) num
, paddress (addr
));
3728 write_enn (own_buf
);
3732 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3733 tpoint
->traceframe_usage
);
3736 /* State variables to help return all the tracepoint bits. */
3737 static struct tracepoint
*cur_tpoint
;
3738 static unsigned int cur_action
;
3739 static unsigned int cur_step_action
;
3740 static struct source_string
*cur_source_string
;
3741 static struct trace_state_variable
*cur_tsv
;
3743 /* Compose a response that is an imitation of the syntax by which the
3744 tracepoint was originally downloaded. */
3747 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3751 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3752 paddress (tpoint
->address
),
3753 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3754 tpoint
->pass_count
);
3755 if (tpoint
->type
== fast_tracepoint
)
3756 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3757 else if (tpoint
->type
== static_tracepoint
)
3758 sprintf (packet
+ strlen (packet
), ":S");
3762 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3763 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3764 tpoint
->cond
->length
, buf
);
3769 /* Compose a response that is an imitation of the syntax by which the
3770 tracepoint action was originally downloaded (with the difference
3771 that due to the way we store the actions, this will output a packet
3772 per action, while GDB could have combined more than one action
3776 response_action (char *packet
, struct tracepoint
*tpoint
,
3777 char *taction
, int step
)
3779 sprintf (packet
, "%c%x:%s:%s",
3780 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3784 /* Compose a response that is an imitation of the syntax by which the
3785 tracepoint source piece was originally downloaded. */
3788 response_source (char *packet
,
3789 struct tracepoint
*tpoint
, struct source_string
*src
)
3794 len
= strlen (src
->str
);
3795 buf
= (char *) alloca (len
* 2 + 1);
3796 bin2hex ((gdb_byte
*) src
->str
, buf
, len
);
3798 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3799 tpoint
->number
, paddress (tpoint
->address
),
3800 src
->type
, 0, len
, buf
);
3803 /* Return the first piece of tracepoint definition, and initialize the
3804 state machine that will iterate through all the tracepoint
3808 cmd_qtfp (char *packet
)
3810 trace_debug ("Returning first tracepoint definition piece");
3812 cur_tpoint
= tracepoints
;
3813 cur_action
= cur_step_action
= 0;
3814 cur_source_string
= NULL
;
3817 response_tracepoint (packet
, cur_tpoint
);
3819 strcpy (packet
, "l");
3822 /* Return additional pieces of tracepoint definition. Each action and
3823 stepping action must go into its own packet, because of packet size
3824 limits, and so we use state variables to deliver one piece at a
3828 cmd_qtsp (char *packet
)
3830 trace_debug ("Returning subsequent tracepoint definition piece");
3834 /* This case would normally never occur, but be prepared for
3836 strcpy (packet
, "l");
3838 else if (cur_action
< cur_tpoint
->numactions
)
3840 response_action (packet
, cur_tpoint
,
3841 cur_tpoint
->actions_str
[cur_action
], 0);
3844 else if (cur_step_action
< cur_tpoint
->num_step_actions
)
3846 response_action (packet
, cur_tpoint
,
3847 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3850 else if ((cur_source_string
3851 ? cur_source_string
->next
3852 : cur_tpoint
->source_strings
))
3854 if (cur_source_string
)
3855 cur_source_string
= cur_source_string
->next
;
3857 cur_source_string
= cur_tpoint
->source_strings
;
3858 response_source (packet
, cur_tpoint
, cur_source_string
);
3862 cur_tpoint
= cur_tpoint
->next
;
3863 cur_action
= cur_step_action
= 0;
3864 cur_source_string
= NULL
;
3866 response_tracepoint (packet
, cur_tpoint
);
3868 strcpy (packet
, "l");
3872 /* Compose a response that is an imitation of the syntax by which the
3873 trace state variable was originally downloaded. */
3876 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3878 char *buf
= (char *) "";
3883 namelen
= strlen (tsv
->name
);
3884 buf
= (char *) alloca (namelen
* 2 + 1);
3885 bin2hex ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3888 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3889 tsv
->getter
? 1 : 0, buf
);
3892 /* Return the first trace state variable definition, and initialize
3893 the state machine that will iterate through all the tsv bits. */
3896 cmd_qtfv (char *packet
)
3898 trace_debug ("Returning first trace state variable definition");
3900 cur_tsv
= trace_state_variables
;
3903 response_tsv (packet
, cur_tsv
);
3905 strcpy (packet
, "l");
3908 /* Return additional trace state variable definitions. */
3911 cmd_qtsv (char *packet
)
3913 trace_debug ("Returning additional trace state variable definition");
3917 cur_tsv
= cur_tsv
->next
;
3919 response_tsv (packet
, cur_tsv
);
3921 strcpy (packet
, "l");
3924 strcpy (packet
, "l");
3927 /* Return the first static tracepoint marker, and initialize the state
3928 machine that will iterate through all the static tracepoints
3932 cmd_qtfstm (char *packet
)
3934 if (!maybe_write_ipa_ust_not_loaded (packet
))
3935 run_inferior_command (packet
, strlen (packet
) + 1);
3938 /* Return additional static tracepoints markers. */
3941 cmd_qtsstm (char *packet
)
3943 if (!maybe_write_ipa_ust_not_loaded (packet
))
3944 run_inferior_command (packet
, strlen (packet
) + 1);
3947 /* Return the definition of the static tracepoint at a given address.
3948 Result packet is the same as qTsST's. */
3951 cmd_qtstmat (char *packet
)
3953 if (!maybe_write_ipa_ust_not_loaded (packet
))
3954 run_inferior_command (packet
, strlen (packet
) + 1);
3957 /* Sent the agent a command to close it. */
3960 gdb_agent_about_to_close (int pid
)
3962 char buf
[IPA_CMD_BUF_SIZE
];
3964 if (!maybe_write_ipa_not_loaded (buf
))
3966 struct thread_info
*saved_thread
;
3968 saved_thread
= current_thread
;
3970 /* Find any thread which belongs to process PID. */
3971 current_thread
= find_any_thread_of_pid (pid
);
3973 strcpy (buf
, "close");
3975 run_inferior_command (buf
, strlen (buf
) + 1);
3977 current_thread
= saved_thread
;
3981 /* Return the minimum instruction size needed for fast tracepoints as a
3982 hexadecimal number. */
3985 cmd_qtminftpilen (char *packet
)
3987 if (current_thread
== NULL
)
3989 /* Indicate that the minimum length is currently unknown. */
3990 strcpy (packet
, "0");
3994 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
3997 /* Respond to qTBuffer packet with a block of raw data from the trace
3998 buffer. GDB may ask for a lot, but we are allowed to reply with
3999 only as much as will fit within packet limits or whatever. */
4002 cmd_qtbuffer (char *own_buf
)
4004 ULONGEST offset
, num
, tot
;
4006 const char *packet
= own_buf
;
4008 packet
+= strlen ("qTBuffer:");
4010 packet
= unpack_varlen_hex (packet
, &offset
);
4011 ++packet
; /* skip a comma */
4012 unpack_varlen_hex (packet
, &num
);
4014 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
4015 (int) num
, phex_nz (offset
, 0));
4017 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
4019 /* If we're right at the end, reply specially that we're done. */
4022 strcpy (own_buf
, "l");
4026 /* Object to any other out-of-bounds request. */
4029 write_enn (own_buf
);
4033 /* Compute the pointer corresponding to the given offset, accounting
4035 tbp
= trace_buffer_start
+ offset
;
4036 if (tbp
>= trace_buffer_wrap
)
4037 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
4039 /* Trim to the remaining bytes if we're close to the end. */
4040 if (num
> tot
- offset
)
4043 /* Trim to available packet size. */
4044 if (num
>= (PBUFSIZ
- 16) / 2 )
4045 num
= (PBUFSIZ
- 16) / 2;
4047 bin2hex (tbp
, own_buf
, num
);
4051 cmd_bigqtbuffer_circular (char *own_buf
)
4054 char *packet
= own_buf
;
4056 packet
+= strlen ("QTBuffer:circular:");
4058 unpack_varlen_hex (packet
, &val
);
4059 circular_trace_buffer
= val
;
4060 trace_debug ("Trace buffer is now %s",
4061 circular_trace_buffer
? "circular" : "linear");
4066 cmd_bigqtbuffer_size (char *own_buf
)
4070 char *packet
= own_buf
;
4072 /* Can't change the size during a tracing run. */
4075 write_enn (own_buf
);
4079 packet
+= strlen ("QTBuffer:size:");
4081 /* -1 is sent as literal "-1". */
4082 if (strcmp (packet
, "-1") == 0)
4083 sval
= DEFAULT_TRACE_BUFFER_SIZE
;
4086 unpack_varlen_hex (packet
, &val
);
4087 sval
= (LONGEST
) val
;
4090 init_trace_buffer (sval
);
4091 trace_debug ("Trace buffer is now %s bytes",
4092 plongest (trace_buffer_size
));
4097 cmd_qtnotes (char *own_buf
)
4100 char *saved
, *user
, *notes
, *stopnote
;
4101 char *packet
= own_buf
;
4103 packet
+= strlen ("QTNotes:");
4107 if (startswith (packet
, "user:"))
4109 packet
+= strlen ("user:");
4111 packet
= strchr (packet
, ';');
4112 nbytes
= (packet
- saved
) / 2;
4113 user
= (char *) xmalloc (nbytes
+ 1);
4114 nbytes
= hex2bin (saved
, (gdb_byte
*) user
, nbytes
);
4115 user
[nbytes
] = '\0';
4116 ++packet
; /* skip the semicolon */
4117 trace_debug ("User is '%s'", user
);
4118 xfree (tracing_user_name
);
4119 tracing_user_name
= user
;
4121 else if (startswith (packet
, "notes:"))
4123 packet
+= strlen ("notes:");
4125 packet
= strchr (packet
, ';');
4126 nbytes
= (packet
- saved
) / 2;
4127 notes
= (char *) xmalloc (nbytes
+ 1);
4128 nbytes
= hex2bin (saved
, (gdb_byte
*) notes
, nbytes
);
4129 notes
[nbytes
] = '\0';
4130 ++packet
; /* skip the semicolon */
4131 trace_debug ("Notes is '%s'", notes
);
4132 xfree (tracing_notes
);
4133 tracing_notes
= notes
;
4135 else if (startswith (packet
, "tstop:"))
4137 packet
+= strlen ("tstop:");
4139 packet
= strchr (packet
, ';');
4140 nbytes
= (packet
- saved
) / 2;
4141 stopnote
= (char *) xmalloc (nbytes
+ 1);
4142 nbytes
= hex2bin (saved
, (gdb_byte
*) stopnote
, nbytes
);
4143 stopnote
[nbytes
] = '\0';
4144 ++packet
; /* skip the semicolon */
4145 trace_debug ("tstop note is '%s'", stopnote
);
4146 xfree (tracing_stop_note
);
4147 tracing_stop_note
= stopnote
;
4157 handle_tracepoint_general_set (char *packet
)
4159 if (strcmp ("QTinit", packet
) == 0)
4161 cmd_qtinit (packet
);
4164 else if (startswith (packet
, "QTDP:"))
4169 else if (startswith (packet
, "QTDPsrc:"))
4171 cmd_qtdpsrc (packet
);
4174 else if (startswith (packet
, "QTEnable:"))
4176 cmd_qtenable_disable (packet
, 1);
4179 else if (startswith (packet
, "QTDisable:"))
4181 cmd_qtenable_disable (packet
, 0);
4184 else if (startswith (packet
, "QTDV:"))
4189 else if (startswith (packet
, "QTro:"))
4194 else if (strcmp ("QTStart", packet
) == 0)
4196 cmd_qtstart (packet
);
4199 else if (strcmp ("QTStop", packet
) == 0)
4201 cmd_qtstop (packet
);
4204 else if (startswith (packet
, "QTDisconnected:"))
4206 cmd_qtdisconnected (packet
);
4209 else if (startswith (packet
, "QTFrame:"))
4211 cmd_qtframe (packet
);
4214 else if (startswith (packet
, "QTBuffer:circular:"))
4216 cmd_bigqtbuffer_circular (packet
);
4219 else if (startswith (packet
, "QTBuffer:size:"))
4221 cmd_bigqtbuffer_size (packet
);
4224 else if (startswith (packet
, "QTNotes:"))
4226 cmd_qtnotes (packet
);
4234 handle_tracepoint_query (char *packet
)
4236 if (strcmp ("qTStatus", packet
) == 0)
4238 cmd_qtstatus (packet
);
4241 else if (startswith (packet
, "qTP:"))
4246 else if (strcmp ("qTfP", packet
) == 0)
4251 else if (strcmp ("qTsP", packet
) == 0)
4256 else if (strcmp ("qTfV", packet
) == 0)
4261 else if (strcmp ("qTsV", packet
) == 0)
4266 else if (startswith (packet
, "qTV:"))
4271 else if (startswith (packet
, "qTBuffer:"))
4273 cmd_qtbuffer (packet
);
4276 else if (strcmp ("qTfSTM", packet
) == 0)
4278 cmd_qtfstm (packet
);
4281 else if (strcmp ("qTsSTM", packet
) == 0)
4283 cmd_qtsstm (packet
);
4286 else if (startswith (packet
, "qTSTMat:"))
4288 cmd_qtstmat (packet
);
4291 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4293 cmd_qtminftpilen (packet
);
4301 #ifndef IN_PROCESS_AGENT
4303 /* Call this when thread TINFO has hit the tracepoint defined by
4304 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4305 action. This adds a while-stepping collecting state item to the
4306 threads' collecting state list, so that we can keep track of
4307 multiple simultaneous while-stepping actions being collected by the
4308 same thread. This can happen in cases like:
4310 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4312 ff0003 INSN3 <-- TP2, collect $regs
4313 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4316 Notice that when instruction INSN5 is reached, the while-stepping
4317 actions of both TP1 and TP3 are still being collected, and that TP2
4318 had been collected meanwhile. The whole range of ff0001-ff0005
4319 should be single-stepped, due to at least TP1's while-stepping
4320 action covering the whole range. */
4323 add_while_stepping_state (struct thread_info
*tinfo
,
4324 int tp_number
, CORE_ADDR tp_address
)
4326 struct wstep_state
*wstep
= XNEW (struct wstep_state
);
4328 wstep
->next
= tinfo
->while_stepping
;
4330 wstep
->tp_number
= tp_number
;
4331 wstep
->tp_address
= tp_address
;
4332 wstep
->current_step
= 0;
4334 tinfo
->while_stepping
= wstep
;
4337 /* Release the while-stepping collecting state WSTEP. */
4340 release_while_stepping_state (struct wstep_state
*wstep
)
4345 /* Release all while-stepping collecting states currently associated
4346 with thread TINFO. */
4349 release_while_stepping_state_list (struct thread_info
*tinfo
)
4351 struct wstep_state
*head
;
4353 while (tinfo
->while_stepping
)
4355 head
= tinfo
->while_stepping
;
4356 tinfo
->while_stepping
= head
->next
;
4357 release_while_stepping_state (head
);
4361 /* If TINFO was handling a 'while-stepping' action, the step has
4362 finished, so collect any step data needed, and check if any more
4363 steps are required. Return true if the thread was indeed
4364 collecting tracepoint data, false otherwise. */
4367 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4369 struct tracepoint
*tpoint
;
4370 struct wstep_state
*wstep
;
4371 struct wstep_state
**wstep_link
;
4372 struct trap_tracepoint_ctx ctx
;
4374 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4376 if (agent_loaded_p ())
4377 upload_fast_traceframes ();
4379 /* Check if we were indeed collecting data for one of more
4380 tracepoints with a 'while-stepping' count. */
4381 if (tinfo
->while_stepping
== NULL
)
4386 /* We're not even tracing anymore. Stop this thread from
4388 release_while_stepping_state_list (tinfo
);
4390 /* The thread had stopped due to a single-step request indeed
4391 explained by a tracepoint. */
4395 wstep
= tinfo
->while_stepping
;
4396 wstep_link
= &tinfo
->while_stepping
;
4398 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4399 target_pid_to_str (tinfo
->id
),
4400 wstep
->tp_number
, paddress (wstep
->tp_address
));
4402 ctx
.base
.type
= trap_tracepoint
;
4403 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4405 while (wstep
!= NULL
)
4407 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4410 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4411 wstep
->tp_number
, paddress (wstep
->tp_address
),
4412 target_pid_to_str (tinfo
->id
));
4415 *wstep_link
= wstep
->next
;
4416 release_while_stepping_state (wstep
);
4417 wstep
= *wstep_link
;
4421 /* We've just finished one step. */
4422 ++wstep
->current_step
;
4425 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4426 stop_pc
, tpoint
, wstep
->current_step
);
4428 if (wstep
->current_step
>= tpoint
->step_count
)
4430 /* The requested numbers of steps have occurred. */
4431 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4432 target_pid_to_str (tinfo
->id
),
4433 wstep
->tp_number
, paddress (wstep
->tp_address
));
4435 /* Unlink the wstep. */
4436 *wstep_link
= wstep
->next
;
4437 release_while_stepping_state (wstep
);
4438 wstep
= *wstep_link
;
4440 /* Only check the hit count now, which ensure that we do all
4441 our stepping before stopping the run. */
4442 if (tpoint
->pass_count
> 0
4443 && tpoint
->hit_count
>= tpoint
->pass_count
4444 && stopping_tracepoint
== NULL
)
4445 stopping_tracepoint
= tpoint
;
4449 /* Keep single-stepping until the requested numbers of steps
4451 wstep_link
= &wstep
->next
;
4452 wstep
= *wstep_link
;
4455 if (stopping_tracepoint
4456 || trace_buffer_is_full
4457 || expr_eval_result
!= expr_eval_no_error
)
4467 /* Handle any internal tracing control breakpoint hits. That means,
4468 pull traceframes from the IPA to our buffer, and syncing both
4469 tracing agents when the IPA's tracing stops for some reason. */
4472 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4474 /* Pull in fast tracepoint trace frames from the inferior in-process
4475 agent's buffer into our buffer. */
4477 if (!agent_loaded_p ())
4480 upload_fast_traceframes ();
4482 /* Check if the in-process agent had decided we should stop
4484 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4486 int ipa_trace_buffer_is_full
;
4487 CORE_ADDR ipa_stopping_tracepoint
;
4488 int ipa_expr_eval_result
;
4489 CORE_ADDR ipa_error_tracepoint
;
4491 trace_debug ("lib stopped at stop_tracing");
4493 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4494 &ipa_trace_buffer_is_full
);
4496 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4497 &ipa_stopping_tracepoint
);
4498 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4500 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4501 &ipa_error_tracepoint
);
4502 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4504 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4505 &ipa_expr_eval_result
);
4506 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4508 trace_debug ("lib: trace_buffer_is_full: %d, "
4509 "stopping_tracepoint: %s, "
4510 "ipa_expr_eval_result: %d, "
4511 "error_tracepoint: %s, ",
4512 ipa_trace_buffer_is_full
,
4513 paddress (ipa_stopping_tracepoint
),
4514 ipa_expr_eval_result
,
4515 paddress (ipa_error_tracepoint
));
4519 if (ipa_trace_buffer_is_full
)
4520 trace_debug ("lib stopped due to full buffer.");
4521 if (ipa_stopping_tracepoint
)
4522 trace_debug ("lib stopped due to tpoint");
4523 if (ipa_error_tracepoint
)
4524 trace_debug ("lib stopped due to error");
4527 if (ipa_stopping_tracepoint
!= 0)
4530 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4532 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4534 expr_eval_result
= ipa_expr_eval_result
;
4536 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4541 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4543 trace_debug ("lib stopped at flush_trace_buffer");
4550 /* Return true if TINFO just hit a tracepoint. Collect data if
4554 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4556 struct tracepoint
*tpoint
;
4558 struct trap_tracepoint_ctx ctx
;
4560 /* Not tracing, don't handle. */
4564 ctx
.base
.type
= trap_tracepoint
;
4565 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4567 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4569 /* Note that we collect fast tracepoints here as well. We'll
4570 step over the fast tracepoint jump later, which avoids the
4571 double collect. However, we don't collect for static
4572 tracepoints here, because UST markers are compiled in program,
4573 and probes will be executed in program. So static tracepoints
4574 are collected there. */
4575 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4576 && tpoint
->type
!= static_tracepoint
)
4578 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4579 target_pid_to_str (tinfo
->id
),
4580 tpoint
->number
, paddress (tpoint
->address
));
4582 /* Test the condition if present, and collect if true. */
4584 || (condition_true_at_tracepoint
4585 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4586 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4589 if (stopping_tracepoint
4590 || trace_buffer_is_full
4591 || expr_eval_result
!= expr_eval_no_error
)
4595 /* If the tracepoint had a 'while-stepping' action, then set
4596 the thread to collect this tracepoint on the following
4598 else if (tpoint
->step_count
> 0)
4600 add_while_stepping_state (tinfo
,
4601 tpoint
->number
, tpoint
->address
);
4613 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4614 struct ust_marker_data
;
4615 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4616 struct traceframe
*tframe
);
4619 /* Create a trace frame for the hit of the given tracepoint in the
4623 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4624 struct tracepoint
*tpoint
)
4626 struct traceframe
*tframe
;
4629 /* Only count it as a hit when we actually collect data. */
4630 tpoint
->hit_count
++;
4632 /* If we've exceeded a defined pass count, record the event for
4633 later, and finish the collection for this hit. This test is only
4634 for nonstepping tracepoints, stepping tracepoints test at the end
4635 of their while-stepping loop. */
4636 if (tpoint
->pass_count
> 0
4637 && tpoint
->hit_count
>= tpoint
->pass_count
4638 && tpoint
->step_count
== 0
4639 && stopping_tracepoint
== NULL
)
4640 stopping_tracepoint
= tpoint
;
4642 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4643 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4645 tframe
= add_traceframe (tpoint
);
4649 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4651 #ifndef IN_PROCESS_AGENT
4652 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4653 tpoint
->number
, paddress (tpoint
->address
),
4654 tpoint
->actions_str
[acti
]);
4657 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4658 tpoint
->actions
[acti
]);
4661 finish_traceframe (tframe
);
4664 if (tframe
== NULL
&& tracing
)
4665 trace_buffer_is_full
= 1;
4668 #ifndef IN_PROCESS_AGENT
4671 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4673 struct tracepoint
*tpoint
, int current_step
)
4675 struct traceframe
*tframe
;
4678 trace_debug ("Making new step traceframe for "
4679 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4680 tpoint
->number
, paddress (tpoint
->address
),
4681 current_step
, tpoint
->step_count
,
4684 tframe
= add_traceframe (tpoint
);
4688 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4690 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4691 tpoint
->number
, paddress (tpoint
->address
),
4692 tpoint
->step_actions_str
[acti
]);
4694 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4695 tpoint
->step_actions
[acti
]);
4698 finish_traceframe (tframe
);
4701 if (tframe
== NULL
&& tracing
)
4702 trace_buffer_is_full
= 1;
4707 #ifdef IN_PROCESS_AGENT
4708 /* The target description index for IPA. Passed from gdbserver, used
4709 to select ipa_tdesc. */
4711 IP_AGENT_EXPORT_VAR
int ipa_tdesc_idx
;
4715 static struct regcache
*
4716 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4718 struct regcache
*regcache
= NULL
;
4719 #ifdef IN_PROCESS_AGENT
4720 const struct target_desc
*ipa_tdesc
= get_ipa_tdesc (ipa_tdesc_idx
);
4722 if (ctx
->type
== fast_tracepoint
)
4724 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4725 if (!fctx
->regcache_initted
)
4727 fctx
->regcache_initted
= 1;
4728 init_register_cache (&fctx
->regcache
, ipa_tdesc
, fctx
->regspace
);
4729 supply_regblock (&fctx
->regcache
, NULL
);
4730 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4732 regcache
= &fctx
->regcache
;
4735 if (ctx
->type
== static_tracepoint
)
4737 struct static_tracepoint_ctx
*sctx
4738 = (struct static_tracepoint_ctx
*) ctx
;
4740 if (!sctx
->regcache_initted
)
4742 sctx
->regcache_initted
= 1;
4743 init_register_cache (&sctx
->regcache
, ipa_tdesc
, sctx
->regspace
);
4744 supply_regblock (&sctx
->regcache
, NULL
);
4745 /* Pass down the tracepoint address, because REGS doesn't
4746 include the PC, but we know what it must have been. */
4747 supply_static_tracepoint_registers (&sctx
->regcache
,
4748 (const unsigned char *)
4750 sctx
->tpoint
->address
);
4752 regcache
= &sctx
->regcache
;
4756 if (ctx
->type
== trap_tracepoint
)
4758 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4759 regcache
= tctx
->regcache
;
4763 gdb_assert (regcache
!= NULL
);
4769 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4771 struct tracepoint
*tpoint
,
4772 struct traceframe
*tframe
,
4773 struct tracepoint_action
*taction
)
4775 enum eval_result_type err
;
4777 switch (taction
->type
)
4781 struct collect_memory_action
*maction
;
4782 struct eval_agent_expr_context ax_ctx
;
4784 maction
= (struct collect_memory_action
*) taction
;
4785 ax_ctx
.regcache
= NULL
;
4786 ax_ctx
.tframe
= tframe
;
4787 ax_ctx
.tpoint
= tpoint
;
4789 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4790 pulongest (maction
->len
),
4791 paddress (maction
->addr
), maction
->basereg
);
4792 /* (should use basereg) */
4793 agent_mem_read (&ax_ctx
, NULL
, (CORE_ADDR
) maction
->addr
,
4799 unsigned char *regspace
;
4800 struct regcache tregcache
;
4801 struct regcache
*context_regcache
;
4804 trace_debug ("Want to collect registers");
4806 context_regcache
= get_context_regcache (ctx
);
4807 regcache_size
= register_cache_size (context_regcache
->tdesc
);
4809 /* Collect all registers for now. */
4810 regspace
= add_traceframe_block (tframe
, tpoint
, 1 + regcache_size
);
4811 if (regspace
== NULL
)
4813 trace_debug ("Trace buffer block allocation failed, skipping");
4816 /* Identify a register block. */
4819 /* Wrap the regblock in a register cache (in the stack, we
4820 don't want to malloc here). */
4821 init_register_cache (&tregcache
, context_regcache
->tdesc
,
4824 /* Copy the register data to the regblock. */
4825 regcache_cpy (&tregcache
, context_regcache
);
4827 #ifndef IN_PROCESS_AGENT
4828 /* On some platforms, trap-based tracepoints will have the PC
4829 pointing to the next instruction after the trap, but we
4830 don't want the user or GDB trying to guess whether the
4831 saved PC needs adjusting; so always record the adjusted
4832 stop_pc. Note that we can't use tpoint->address instead,
4833 since it will be wrong for while-stepping actions. This
4834 adjustment is a nop for fast tracepoints collected from the
4835 in-process lib (but not if GDBserver is collecting one
4836 preemptively), since the PC had already been adjusted to
4837 contain the tracepoint's address by the jump pad. */
4838 trace_debug ("Storing stop pc (0x%s) in regblock",
4839 paddress (stop_pc
));
4841 /* This changes the regblock, not the thread's
4843 regcache_write_pc (&tregcache
, stop_pc
);
4849 struct eval_expr_action
*eaction
;
4850 struct eval_agent_expr_context ax_ctx
;
4852 eaction
= (struct eval_expr_action
*) taction
;
4853 ax_ctx
.regcache
= get_context_regcache (ctx
);
4854 ax_ctx
.tframe
= tframe
;
4855 ax_ctx
.tpoint
= tpoint
;
4857 trace_debug ("Want to evaluate expression");
4859 err
= gdb_eval_agent_expr (&ax_ctx
, eaction
->expr
, NULL
);
4861 if (err
!= expr_eval_no_error
)
4863 record_tracepoint_error (tpoint
, "action expression", err
);
4870 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4871 trace_debug ("Want to collect static trace data");
4872 collect_ust_data_at_tracepoint (ctx
, tframe
);
4874 trace_debug ("warning: collecting static trace data, "
4875 "but static tracepoints are not supported");
4880 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4886 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4887 struct tracepoint
*tpoint
)
4890 enum eval_result_type err
;
4892 /* Presently, gdbserver doesn't run compiled conditions, only the
4893 IPA does. If the program stops at a fast tracepoint's address
4894 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4895 gdbserver preemptively collect the fast tracepoint. Later, on
4896 resume, gdbserver steps over the fast tracepoint like it steps
4897 over breakpoints, so that the IPA doesn't see that fast
4898 tracepoint. This avoids double collects of fast tracepoints in
4899 that stopping scenario. Having gdbserver itself handle the fast
4900 tracepoint gives the user a consistent view of when fast or trap
4901 tracepoints are collected, compared to an alternative where only
4902 trap tracepoints are collected on stop, and fast tracepoints on
4903 resume. When a fast tracepoint is being processed by gdbserver,
4904 it is always the non-compiled condition expression that is
4906 #ifdef IN_PROCESS_AGENT
4907 if (tpoint
->compiled_cond
)
4909 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4910 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (fctx
->regs
, &value
);
4915 struct eval_agent_expr_context ax_ctx
;
4917 ax_ctx
.regcache
= get_context_regcache (ctx
);
4918 ax_ctx
.tframe
= NULL
;
4919 ax_ctx
.tpoint
= tpoint
;
4921 err
= gdb_eval_agent_expr (&ax_ctx
, tpoint
->cond
, &value
);
4923 if (err
!= expr_eval_no_error
)
4925 record_tracepoint_error (tpoint
, "condition", err
);
4926 /* The error case must return false. */
4930 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4931 tpoint
->number
, paddress (tpoint
->address
),
4933 return (value
? 1 : 0);
4936 /* Do memory copies for bytecodes. */
4937 /* Do the recording of memory blocks for actions and bytecodes. */
4940 agent_mem_read (struct eval_agent_expr_context
*ctx
,
4941 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4943 unsigned char *mspace
;
4944 ULONGEST remaining
= len
;
4945 unsigned short blocklen
;
4947 /* If a 'to' buffer is specified, use it. */
4950 read_inferior_memory (from
, to
, len
);
4954 /* Otherwise, create a new memory block in the trace buffer. */
4955 while (remaining
> 0)
4959 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4960 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4961 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
4964 /* Identify block as a memory block. */
4967 /* Record address and size. */
4968 memcpy (mspace
, &from
, sizeof (from
));
4969 mspace
+= sizeof (from
);
4970 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4971 mspace
+= sizeof (blocklen
);
4972 /* Record the memory block proper. */
4973 read_inferior_memory (from
, mspace
, blocklen
);
4974 trace_debug ("%d bytes recorded", blocklen
);
4975 remaining
-= blocklen
;
4982 agent_mem_read_string (struct eval_agent_expr_context
*ctx
,
4983 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4985 unsigned char *buf
, *mspace
;
4986 ULONGEST remaining
= len
;
4987 unsigned short blocklen
, i
;
4989 /* To save a bit of space, block lengths are 16-bit, so break large
4990 requests into multiple blocks. Bordering on overkill for strings,
4991 but it could happen that someone specifies a large max length. */
4992 while (remaining
> 0)
4996 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4997 /* We want working space to accumulate nonzero bytes, since
4998 traceframes must have a predecided size (otherwise it gets
4999 harder to wrap correctly for the circular case, etc). */
5000 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
5001 for (i
= 0; i
< blocklen
; ++i
)
5003 /* Read the string one byte at a time, in case the string is
5004 at the end of a valid memory area - we don't want a
5005 correctly-terminated string to engender segvio
5007 read_inferior_memory (from
+ i
, buf
+ i
, 1);
5012 /* Make sure outer loop stops now too. */
5013 remaining
= blocklen
;
5017 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
5018 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
5024 /* Identify block as a memory block. */
5027 /* Record address and size. */
5028 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
5029 mspace
+= sizeof (from
);
5030 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
5031 mspace
+= sizeof (blocklen
);
5032 /* Copy the string contents. */
5033 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
5034 remaining
-= blocklen
;
5041 /* Record the value of a trace state variable. */
5044 agent_tsv_read (struct eval_agent_expr_context
*ctx
, int n
)
5046 unsigned char *vspace
;
5049 vspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
,
5050 1 + sizeof (n
) + sizeof (LONGEST
));
5053 /* Identify block as a variable. */
5055 /* Record variable's number and value. */
5056 memcpy (vspace
+ 1, &n
, sizeof (n
));
5057 val
= get_trace_state_variable_value (n
);
5058 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
5059 trace_debug ("Variable %d recorded", n
);
5063 #ifndef IN_PROCESS_AGENT
5065 /* Callback for traceframe_walk_blocks, used to find a given block
5066 type in a traceframe. */
5069 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
5071 char *wantedp
= (char *) data
;
5073 if (*wantedp
== blocktype
)
5079 /* Walk over all traceframe blocks of the traceframe buffer starting
5080 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5081 block found, passing in DATA unmodified. If CALLBACK returns true,
5082 this returns a pointer to where the block is found. Returns NULL
5083 if no callback call returned true, indicating that all blocks have
5086 static unsigned char *
5087 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
5089 int (*callback
) (char blocktype
,
5090 unsigned char *dataptr
,
5094 unsigned char *dataptr
;
5098 trace_debug ("traceframe %d has no data", tfnum
);
5102 /* Iterate through a traceframe's blocks, looking for a block of the
5104 for (dataptr
= database
;
5105 dataptr
< database
+ datasize
;
5109 unsigned short mlen
;
5111 if (dataptr
== trace_buffer_wrap
)
5113 /* Adjust to reflect wrapping part of the frame around to
5115 datasize
= dataptr
- database
;
5116 dataptr
= database
= trace_buffer_lo
;
5119 blocktype
= *dataptr
++;
5121 if ((*callback
) (blocktype
, dataptr
, data
))
5127 /* Skip over the registers block. */
5128 dataptr
+= current_target_desc ()->registers_size
;
5131 /* Skip over the memory block. */
5132 dataptr
+= sizeof (CORE_ADDR
);
5133 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5134 dataptr
+= (sizeof (mlen
) + mlen
);
5137 /* Skip over the TSV block. */
5138 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5141 /* Skip over the static trace data block. */
5142 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5143 dataptr
+= (sizeof (mlen
) + mlen
);
5146 trace_debug ("traceframe %d has unknown block type 0x%x",
5155 /* Look for the block of type TYPE_WANTED in the trameframe starting
5156 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5159 static unsigned char *
5160 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5161 int tfnum
, char type_wanted
)
5163 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5164 match_blocktype
, &type_wanted
);
5167 static unsigned char *
5168 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5170 unsigned char *regblock
;
5172 regblock
= traceframe_find_block_type (tframe
->data
,
5176 if (regblock
== NULL
)
5177 trace_debug ("traceframe %d has no register data", tfnum
);
5182 /* Get registers from a traceframe. */
5185 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5187 unsigned char *dataptr
;
5188 struct tracepoint
*tpoint
;
5189 struct traceframe
*tframe
;
5191 tframe
= find_traceframe (tfnum
);
5195 trace_debug ("traceframe %d not found", tfnum
);
5199 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5200 if (dataptr
== NULL
)
5202 /* Mark registers unavailable. */
5203 supply_regblock (regcache
, NULL
);
5205 /* We can generally guess at a PC, although this will be
5206 misleading for while-stepping frames and multi-location
5208 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5210 regcache_write_pc (regcache
, tpoint
->address
);
5213 supply_regblock (regcache
, dataptr
);
5219 traceframe_get_pc (struct traceframe
*tframe
)
5221 struct regcache regcache
;
5222 unsigned char *dataptr
;
5223 const struct target_desc
*tdesc
= current_target_desc ();
5225 dataptr
= traceframe_find_regblock (tframe
, -1);
5226 if (dataptr
== NULL
)
5229 init_register_cache (®cache
, tdesc
, dataptr
);
5230 return regcache_read_pc (®cache
);
5233 /* Read a requested block of memory from a trace frame. */
5236 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5237 unsigned char *buf
, ULONGEST length
,
5240 struct traceframe
*tframe
;
5241 unsigned char *database
, *dataptr
;
5242 unsigned int datasize
;
5244 unsigned short mlen
;
5246 trace_debug ("traceframe_read_mem");
5248 tframe
= find_traceframe (tfnum
);
5252 trace_debug ("traceframe %d not found", tfnum
);
5256 datasize
= tframe
->data_size
;
5257 database
= dataptr
= &tframe
->data
[0];
5259 /* Iterate through a traceframe's blocks, looking for memory. */
5260 while ((dataptr
= traceframe_find_block_type (dataptr
,
5262 - (dataptr
- database
),
5263 tfnum
, 'M')) != NULL
)
5265 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5266 dataptr
+= sizeof (maddr
);
5267 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5268 dataptr
+= sizeof (mlen
);
5269 trace_debug ("traceframe %d has %d bytes at %s",
5270 tfnum
, mlen
, paddress (maddr
));
5272 /* If the block includes the first part of the desired range,
5273 return as much it has; GDB will re-request the remainder,
5274 which might be in a different block of this trace frame. */
5275 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5277 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5281 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5286 /* Skip over this block. */
5290 trace_debug ("traceframe %d has no memory data for the desired region",
5298 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5301 struct traceframe
*tframe
;
5302 unsigned char *database
, *dataptr
;
5303 unsigned int datasize
;
5307 trace_debug ("traceframe_read_tsv");
5309 tfnum
= current_traceframe
;
5313 trace_debug ("no current traceframe");
5317 tframe
= find_traceframe (tfnum
);
5321 trace_debug ("traceframe %d not found", tfnum
);
5325 datasize
= tframe
->data_size
;
5326 database
= dataptr
= &tframe
->data
[0];
5328 /* Iterate through a traceframe's blocks, looking for the last
5330 while ((dataptr
= traceframe_find_block_type (dataptr
,
5332 - (dataptr
- database
),
5333 tfnum
, 'V')) != NULL
)
5335 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5336 dataptr
+= sizeof (vnum
);
5338 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5340 /* Check that this is the variable we want. */
5343 memcpy (val
, dataptr
, sizeof (*val
));
5347 /* Skip over this block. */
5348 dataptr
+= sizeof (LONGEST
);
5352 trace_debug ("traceframe %d has no data for variable %d",
5357 /* Read a requested block of static tracepoint data from a trace
5361 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5362 unsigned char *buf
, ULONGEST length
,
5365 struct traceframe
*tframe
;
5366 unsigned char *database
, *dataptr
;
5367 unsigned int datasize
;
5368 unsigned short mlen
;
5370 trace_debug ("traceframe_read_sdata");
5372 tframe
= find_traceframe (tfnum
);
5376 trace_debug ("traceframe %d not found", tfnum
);
5380 datasize
= tframe
->data_size
;
5381 database
= &tframe
->data
[0];
5383 /* Iterate through a traceframe's blocks, looking for static
5385 dataptr
= traceframe_find_block_type (database
, datasize
,
5387 if (dataptr
!= NULL
)
5389 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5390 dataptr
+= sizeof (mlen
);
5393 if (offset
+ length
> mlen
)
5394 length
= mlen
- offset
;
5396 memcpy (buf
, dataptr
, length
);
5404 trace_debug ("traceframe %d has no static trace data", tfnum
);
5410 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5411 object. DATA is pointer to a struct buffer holding the
5412 traceframe-info object being built. */
5415 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5417 struct buffer
*buffer
= (struct buffer
*) data
;
5423 unsigned short mlen
;
5426 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5427 dataptr
+= sizeof (maddr
);
5428 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5429 dataptr
+= sizeof (mlen
);
5430 buffer_xml_printf (buffer
,
5431 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5432 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5439 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5440 buffer_xml_printf (buffer
, "<tvar id=\"%d\"/>\n", vnum
);
5449 warning ("Unhandled trace block type (%d) '%c ' "
5450 "while building trace frame info.",
5451 blocktype
, blocktype
);
5458 /* Build a traceframe-info object for traceframe number TFNUM into
5462 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5464 struct traceframe
*tframe
;
5466 trace_debug ("traceframe_read_info");
5468 tframe
= find_traceframe (tfnum
);
5472 trace_debug ("traceframe %d not found", tfnum
);
5476 buffer_grow_str (buffer
, "<traceframe-info>\n");
5477 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5478 tfnum
, build_traceframe_info_xml
, buffer
);
5479 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5483 /* Return the first fast tracepoint whose jump pad contains PC. */
5485 static struct tracepoint
*
5486 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5488 struct tracepoint
*tpoint
;
5490 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5491 if (tpoint
->type
== fast_tracepoint
)
5492 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5498 /* Return the first fast tracepoint whose trampoline contains PC. */
5500 static struct tracepoint
*
5501 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5503 struct tracepoint
*tpoint
;
5505 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5507 if (tpoint
->type
== fast_tracepoint
5508 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5515 /* Return GDBserver's tracepoint that matches the IP Agent's
5516 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5519 static struct tracepoint
*
5520 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5522 struct tracepoint
*tpoint
;
5524 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5525 if (tpoint
->type
== fast_tracepoint
)
5526 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5534 /* The type of the object that is used to synchronize fast tracepoint
5537 typedef struct collecting_t
5539 /* The fast tracepoint number currently collecting. */
5542 /* A number that GDBserver can use to identify the thread that is
5543 presently holding the collect lock. This need not (and usually
5544 is not) the thread id, as getting the current thread ID usually
5545 requires a system call, which we want to avoid like the plague.
5546 Usually this is thread's TCB, found in the TLS (pseudo-)
5547 register, which is readable with a single insn on several
5549 uintptr_t thread_area
;
5552 #ifndef IN_PROCESS_AGENT
5555 force_unlock_trace_buffer (void)
5557 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5560 /* Check if the thread identified by THREAD_AREA which is stopped at
5561 STOP_PC, is presently locking the fast tracepoint collection, and
5562 if so, gather some status of said collection. Returns 0 if the
5563 thread isn't collecting or in the jump pad at all. 1, if in the
5564 jump pad (or within gdb_collect) and hasn't executed the adjusted
5565 original insn yet (can set a breakpoint there and run to it). 2,
5566 if presently executing the adjusted original insn --- in which
5567 case, if we want to move the thread out of the jump pad, we need to
5568 single-step it until this function returns 0. */
5570 fast_tpoint_collect_result
5571 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5573 struct fast_tpoint_collect_status
*status
)
5575 CORE_ADDR ipa_collecting
;
5576 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5577 CORE_ADDR ipa_gdb_trampoline_buffer
;
5578 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5579 struct tracepoint
*tpoint
;
5580 int needs_breakpoint
;
5582 /* The thread THREAD_AREA is either:
5584 0. not collecting at all, not within the jump pad, or within
5585 gdb_collect or one of its callees.
5587 1. in the jump pad and haven't reached gdb_collect
5589 2. within gdb_collect (out of the jump pad) (collect is set)
5591 3. we're in the jump pad, after gdb_collect having returned,
5592 possibly executing the adjusted insns.
5594 For cases 1 and 3, `collecting' may or not be set. The jump pad
5595 doesn't have any complicated jump logic, so we can tell if the
5596 thread is executing the adjust original insn or not by just
5597 matching STOP_PC with known jump pad addresses. If we it isn't
5598 yet executing the original insn, set a breakpoint there, and let
5599 the thread run to it, so to quickly step over a possible (many
5600 insns) gdb_collect call. Otherwise, or when the breakpoint is
5601 hit, only a few (small number of) insns are left to be executed
5602 in the jump pad. Single-step the thread until it leaves the
5607 needs_breakpoint
= 0;
5608 trace_debug ("fast_tracepoint_collecting");
5610 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5611 &ipa_gdb_jump_pad_buffer
))
5613 internal_error (__FILE__
, __LINE__
,
5614 "error extracting `gdb_jump_pad_buffer'");
5616 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5617 &ipa_gdb_jump_pad_buffer_end
))
5619 internal_error (__FILE__
, __LINE__
,
5620 "error extracting `gdb_jump_pad_buffer_end'");
5623 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5624 &ipa_gdb_trampoline_buffer
))
5626 internal_error (__FILE__
, __LINE__
,
5627 "error extracting `gdb_trampoline_buffer'");
5629 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5630 &ipa_gdb_trampoline_buffer_end
))
5632 internal_error (__FILE__
, __LINE__
,
5633 "error extracting `gdb_trampoline_buffer_end'");
5636 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5637 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5639 /* We can tell which tracepoint(s) the thread is collecting by
5640 matching the jump pad address back to the tracepoint. */
5641 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5644 warning ("in jump pad, but no matching tpoint?");
5645 return fast_tpoint_collect_result::not_collecting
;
5649 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5651 tpoint
->number
, paddress (tpoint
->address
),
5652 paddress (tpoint
->jump_pad
),
5653 paddress (tpoint
->jump_pad_end
),
5654 paddress (tpoint
->adjusted_insn_addr
),
5655 paddress (tpoint
->adjusted_insn_addr_end
));
5658 /* Definitely in the jump pad. May or may not need
5659 fast-exit-jump-pad breakpoint. */
5660 if (tpoint
->jump_pad
<= stop_pc
5661 && stop_pc
< tpoint
->adjusted_insn_addr
)
5662 needs_breakpoint
= 1;
5664 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5665 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5667 /* We can tell which tracepoint(s) the thread is collecting by
5668 matching the trampoline address back to the tracepoint. */
5669 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5672 warning ("in trampoline, but no matching tpoint?");
5673 return fast_tpoint_collect_result::not_collecting
;
5677 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5678 tpoint
->number
, paddress (tpoint
->address
),
5679 paddress (tpoint
->trampoline
),
5680 paddress (tpoint
->trampoline_end
));
5683 /* Have not reached jump pad yet, but treat the trampoline as a
5684 part of the jump pad that is before the adjusted original
5686 needs_breakpoint
= 1;
5690 collecting_t ipa_collecting_obj
;
5692 /* If `collecting' is set/locked, then the THREAD_AREA thread
5693 may or not be the one holding the lock. We have to read the
5694 lock to find out. */
5696 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5699 trace_debug ("fast_tracepoint_collecting:"
5700 " failed reading 'collecting' in the inferior");
5701 return fast_tpoint_collect_result::not_collecting
;
5704 if (!ipa_collecting
)
5706 trace_debug ("fast_tracepoint_collecting: not collecting"
5707 " (and nobody is).");
5708 return fast_tpoint_collect_result::not_collecting
;
5711 /* Some thread is collecting. Check which. */
5712 if (read_inferior_memory (ipa_collecting
,
5713 (unsigned char *) &ipa_collecting_obj
,
5714 sizeof (ipa_collecting_obj
)) != 0)
5717 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5719 trace_debug ("fast_tracepoint_collecting: not collecting "
5720 "(another thread is)");
5721 return fast_tpoint_collect_result::not_collecting
;
5725 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5728 warning ("fast_tracepoint_collecting: collecting, "
5729 "but tpoint %s not found?",
5730 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5731 return fast_tpoint_collect_result::not_collecting
;
5734 /* The thread is within `gdb_collect', skip over the rest of
5735 fast tracepoint collection quickly using a breakpoint. */
5736 needs_breakpoint
= 1;
5739 /* The caller wants a bit of status detail. */
5742 status
->tpoint_num
= tpoint
->number
;
5743 status
->tpoint_addr
= tpoint
->address
;
5744 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5745 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5748 if (needs_breakpoint
)
5750 /* Hasn't executed the original instruction yet. Set breakpoint
5751 there, and wait till it's hit, then single-step until exiting
5755 fast_tracepoint_collecting, returning continue-until-break at %s",
5756 paddress (tpoint
->adjusted_insn_addr
));
5758 return fast_tpoint_collect_result::before_insn
; /* continue */
5762 /* Just single-step until exiting the jump pad. */
5764 trace_debug ("fast_tracepoint_collecting, returning "
5765 "need-single-step (%s-%s)",
5766 paddress (tpoint
->adjusted_insn_addr
),
5767 paddress (tpoint
->adjusted_insn_addr_end
));
5769 return fast_tpoint_collect_result::at_insn
; /* single-step */
5775 #ifdef IN_PROCESS_AGENT
5777 /* The global fast tracepoint collect lock. Points to a collecting_t
5778 object built on the stack by the jump pad, if presently locked;
5779 NULL if it isn't locked. Note that this lock *must* be set while
5780 executing any *function other than the jump pad. See
5781 fast_tracepoint_collecting. */
5783 IP_AGENT_EXPORT_VAR collecting_t
*collecting
;
5786 /* This routine, called from the jump pad (in asm) is designed to be
5787 called from the jump pads of fast tracepoints, thus it is on the
5790 IP_AGENT_EXPORT_FUNC
void
5791 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5793 struct fast_tracepoint_ctx ctx
;
5794 const struct target_desc
*ipa_tdesc
;
5796 /* Don't do anything until the trace run is completely set up. */
5800 ipa_tdesc
= get_ipa_tdesc (ipa_tdesc_idx
);
5801 ctx
.base
.type
= fast_tracepoint
;
5803 ctx
.regcache_initted
= 0;
5804 /* Wrap the regblock in a register cache (in the stack, we don't
5805 want to malloc here). */
5806 ctx
.regspace
= (unsigned char *) alloca (ipa_tdesc
->registers_size
);
5807 if (ctx
.regspace
== NULL
)
5809 trace_debug ("Trace buffer block allocation failed, skipping");
5813 for (ctx
.tpoint
= tpoint
;
5814 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5815 ctx
.tpoint
= ctx
.tpoint
->next
)
5817 if (!ctx
.tpoint
->enabled
)
5820 /* Multiple tracepoints of different types, such as fast tracepoint and
5821 static tracepoint, can be set at the same address. */
5822 if (ctx
.tpoint
->type
!= tpoint
->type
)
5825 /* Test the condition if present, and collect if true. */
5826 if (ctx
.tpoint
->cond
== NULL
5827 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5830 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5831 ctx
.tpoint
->address
, ctx
.tpoint
);
5833 /* Note that this will cause original insns to be written back
5834 to where we jumped from, but that's OK because we're jumping
5835 back to the next whole instruction. This will go badly if
5836 instruction restoration is not atomic though. */
5837 if (stopping_tracepoint
5838 || trace_buffer_is_full
5839 || expr_eval_result
!= expr_eval_no_error
)
5847 /* If there was a condition and it evaluated to false, the only
5848 way we would stop tracing is if there was an error during
5849 condition expression evaluation. */
5850 if (expr_eval_result
!= expr_eval_no_error
)
5859 /* These global variables points to the corresponding functions. This is
5860 necessary on powerpc64, where asking for function symbol address from gdb
5861 results in returning the actual code pointer, instead of the descriptor
5864 typedef void (*gdb_collect_ptr_type
) (struct tracepoint
*, unsigned char *);
5865 typedef ULONGEST (*get_raw_reg_ptr_type
) (const unsigned char *, int);
5866 typedef LONGEST (*get_trace_state_variable_value_ptr_type
) (int);
5867 typedef void (*set_trace_state_variable_value_ptr_type
) (int, LONGEST
);
5870 IP_AGENT_EXPORT_VAR gdb_collect_ptr_type gdb_collect_ptr
= gdb_collect
;
5871 IP_AGENT_EXPORT_VAR get_raw_reg_ptr_type get_raw_reg_ptr
= get_raw_reg
;
5872 IP_AGENT_EXPORT_VAR get_trace_state_variable_value_ptr_type
5873 get_trace_state_variable_value_ptr
= get_trace_state_variable_value
;
5874 IP_AGENT_EXPORT_VAR set_trace_state_variable_value_ptr_type
5875 set_trace_state_variable_value_ptr
= set_trace_state_variable_value
;
5880 #ifndef IN_PROCESS_AGENT
5883 get_raw_reg_func_addr (void)
5886 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_get_raw_reg_ptr
, &res
))
5888 error ("error extracting get_raw_reg_ptr");
5895 get_get_tsv_func_addr (void)
5898 if (read_inferior_data_pointer (
5899 ipa_sym_addrs
.addr_get_trace_state_variable_value_ptr
, &res
))
5901 error ("error extracting get_trace_state_variable_value_ptr");
5908 get_set_tsv_func_addr (void)
5911 if (read_inferior_data_pointer (
5912 ipa_sym_addrs
.addr_set_trace_state_variable_value_ptr
, &res
))
5914 error ("error extracting set_trace_state_variable_value_ptr");
5921 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5922 CORE_ADDR
*jump_entry
)
5924 CORE_ADDR entry_point
= *jump_entry
;
5925 enum eval_result_type err
;
5927 trace_debug ("Starting condition compilation for tracepoint %d\n",
5930 /* Initialize the global pointer to the code being built. */
5931 current_insn_ptr
= *jump_entry
;
5935 err
= compile_bytecodes (tpoint
->cond
);
5937 if (err
== expr_eval_no_error
)
5941 /* Record the beginning of the compiled code. */
5942 tpoint
->compiled_cond
= entry_point
;
5944 trace_debug ("Condition compilation for tracepoint %d complete\n",
5949 /* Leave the unfinished code in situ, but don't point to it. */
5951 tpoint
->compiled_cond
= 0;
5953 trace_debug ("Condition compilation for tracepoint %d failed, "
5955 tpoint
->number
, err
);
5958 /* Update the code pointer passed in. Note that we do this even if
5959 the compile fails, so that we can look at the partial results
5960 instead of letting them be overwritten. */
5961 *jump_entry
= current_insn_ptr
;
5963 /* Leave a gap, to aid dump decipherment. */
5967 /* The base pointer of the IPA's heap. This is the only memory the
5968 IPA is allowed to use. The IPA should _not_ call the inferior's
5969 `malloc' during operation. That'd be slow, and, most importantly,
5970 it may not be safe. We may be collecting a tracepoint in a signal
5971 handler, for example. */
5972 static CORE_ADDR target_tp_heap
;
5974 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5978 target_malloc (ULONGEST size
)
5982 if (target_tp_heap
== 0)
5984 /* We have the pointer *address*, need what it points to. */
5985 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5988 internal_error (__FILE__
, __LINE__
,
5989 "couldn't get target heap head pointer");
5993 ptr
= target_tp_heap
;
5994 target_tp_heap
+= size
;
5996 /* Pad to 8-byte alignment. */
5997 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
6003 download_agent_expr (struct agent_expr
*expr
)
6005 CORE_ADDR expr_addr
;
6006 CORE_ADDR expr_bytes
;
6008 expr_addr
= target_malloc (sizeof (*expr
));
6009 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
6011 expr_bytes
= target_malloc (expr
->length
);
6012 write_inferior_data_pointer (expr_addr
+ offsetof (struct agent_expr
, bytes
),
6014 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
6019 /* Align V up to N bits. */
6020 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
6022 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
6025 download_tracepoint_1 (struct tracepoint
*tpoint
)
6027 struct tracepoint target_tracepoint
;
6028 CORE_ADDR tpptr
= 0;
6030 gdb_assert (tpoint
->type
== fast_tracepoint
6031 || tpoint
->type
== static_tracepoint
);
6033 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
6035 CORE_ADDR jentry
, jump_entry
;
6037 jentry
= jump_entry
= get_jump_space_head ();
6039 if (tpoint
->cond
!= NULL
)
6041 /* Pad to 8-byte alignment. (needed?) */
6042 /* Actually this should be left for the target to
6044 jentry
= UALIGN (jentry
, 8);
6046 compile_tracepoint_condition (tpoint
, &jentry
);
6049 /* Pad to 8-byte alignment. */
6050 jentry
= UALIGN (jentry
, 8);
6051 claim_jump_space (jentry
- jump_entry
);
6054 target_tracepoint
= *tpoint
;
6056 tpptr
= target_malloc (sizeof (*tpoint
));
6057 tpoint
->obj_addr_on_target
= tpptr
;
6059 /* Write the whole object. We'll fix up its pointers in a bit.
6060 Assume no next for now. This is fixed up above on the next
6061 iteration, if there's any. */
6062 target_tracepoint
.next
= NULL
;
6063 /* Need to clear this here too, since we're downloading the
6064 tracepoints before clearing our own copy. */
6065 target_tracepoint
.hit_count
= 0;
6067 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
6068 sizeof (target_tracepoint
));
6071 write_inferior_data_pointer (tpptr
6072 + offsetof (struct tracepoint
, cond
),
6073 download_agent_expr (tpoint
->cond
));
6075 if (tpoint
->numactions
)
6078 CORE_ADDR actions_array
;
6080 /* The pointers array. */
6082 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
6083 write_inferior_data_pointer (tpptr
+ offsetof (struct tracepoint
,
6087 /* Now for each pointer, download the action. */
6088 for (i
= 0; i
< tpoint
->numactions
; i
++)
6090 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6091 CORE_ADDR ipa_action
= tracepoint_action_download (action
);
6093 if (ipa_action
!= 0)
6094 write_inferior_data_pointer (actions_array
6095 + i
* sizeof (*tpoint
->actions
),
6101 #define IPA_PROTO_FAST_TRACE_FLAG 0
6102 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
6103 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
6104 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
6105 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
6107 /* Send a command to agent to download and install tracepoint TPOINT. */
6110 tracepoint_send_agent (struct tracepoint
*tpoint
)
6112 char buf
[IPA_CMD_BUF_SIZE
];
6117 strcpy (p
, "FastTrace:");
6120 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
6121 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
6122 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
6123 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
6124 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
6125 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
6126 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
6127 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
6128 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
6129 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
6130 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
6133 p
= agent_expr_send (p
, tpoint
->cond
);
6135 /* tracepoint_action */
6136 for (i
= 0; i
< tpoint
->numactions
; i
++)
6138 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6140 p
[0] = action
->type
;
6141 p
= tracepoint_action_send (&p
[1], action
);
6144 get_jump_space_head ();
6145 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6146 agent can use jump pad from it. */
6147 if (tpoint
->type
== fast_tracepoint
)
6149 memcpy (p
, &gdb_jump_pad_head
, 8);
6153 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
6157 if (!startswith (buf
, "OK"))
6160 /* The value of tracepoint's target address is stored in BUF. */
6161 memcpy (&tpoint
->obj_addr_on_target
,
6162 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6164 if (tpoint
->type
== fast_tracepoint
)
6167 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6170 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6171 (unsigned int) tpoint
->obj_addr_on_target
,
6172 (unsigned int) gdb_jump_pad_head
);
6174 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6176 /* This has been done in agent. We should also set up record for it. */
6177 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6180 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6187 download_tracepoint (struct tracepoint
*tpoint
)
6189 struct tracepoint
*tp
, *tp_prev
;
6191 if (tpoint
->type
!= fast_tracepoint
6192 && tpoint
->type
!= static_tracepoint
)
6195 download_tracepoint_1 (tpoint
);
6197 /* Find the previous entry of TPOINT, which is fast tracepoint or
6198 static tracepoint. */
6200 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6202 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6208 CORE_ADDR tp_prev_target_next_addr
;
6210 /* Insert TPOINT after TP_PREV in IPA. */
6211 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6212 + offsetof (struct tracepoint
, next
),
6213 &tp_prev_target_next_addr
))
6215 internal_error (__FILE__
, __LINE__
,
6216 "error reading `tp_prev->next'");
6219 /* tpoint->next = tp_prev->next */
6220 write_inferior_data_pointer (tpoint
->obj_addr_on_target
6221 + offsetof (struct tracepoint
, next
),
6222 tp_prev_target_next_addr
);
6223 /* tp_prev->next = tpoint */
6224 write_inferior_data_pointer (tp_prev
->obj_addr_on_target
6225 + offsetof (struct tracepoint
, next
),
6226 tpoint
->obj_addr_on_target
);
6229 /* First object in list, set the head pointer in the
6231 write_inferior_data_pointer (ipa_sym_addrs
.addr_tracepoints
,
6232 tpoint
->obj_addr_on_target
);
6237 download_trace_state_variables (void)
6239 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6240 struct trace_state_variable
*tsv
;
6242 /* Start out empty. */
6243 write_inferior_data_pointer (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6245 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6247 struct trace_state_variable target_tsv
;
6249 /* TSV's with a getter have been initialized equally in both the
6250 inferior and GDBserver. Skip them. */
6251 if (tsv
->getter
!= NULL
)
6257 ptr
= target_malloc (sizeof (*tsv
));
6259 if (tsv
== trace_state_variables
)
6261 /* First object in list, set the head pointer in the
6264 write_inferior_data_pointer (ipa_sym_addrs
.addr_trace_state_variables
,
6269 write_inferior_data_pointer (prev_ptr
6270 + offsetof (struct trace_state_variable
,
6275 /* Write the whole object. We'll fix up its pointers in a bit.
6276 Assume no next, fixup when needed. */
6277 target_tsv
.next
= NULL
;
6279 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6280 sizeof (target_tsv
));
6282 if (tsv
->name
!= NULL
)
6284 size_t size
= strlen (tsv
->name
) + 1;
6285 CORE_ADDR name_addr
= target_malloc (size
);
6286 write_inferior_memory (name_addr
,
6287 (unsigned char *) tsv
->name
, size
);
6288 write_inferior_data_pointer (ptr
6289 + offsetof (struct trace_state_variable
,
6294 gdb_assert (tsv
->getter
== NULL
);
6299 /* Fixup the next pointer in the last item in the list. */
6300 write_inferior_data_pointer (prev_ptr
6301 + offsetof (struct trace_state_variable
,
6306 /* Upload complete trace frames out of the IP Agent's trace buffer
6307 into GDBserver's trace buffer. This always uploads either all or
6308 no trace frames. This is the counter part of
6309 `trace_alloc_trace_buffer'. See its description of the atomic
6310 synching mechanism. */
6313 upload_fast_traceframes (void)
6315 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6316 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6318 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6319 unsigned int curr_tbctrl_idx
;
6320 unsigned int ipa_trace_buffer_ctrl_curr
;
6321 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6322 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6323 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6324 CORE_ADDR ipa_trace_buffer_lo
;
6325 CORE_ADDR ipa_trace_buffer_hi
;
6327 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6328 &ipa_traceframe_read_count_racy
))
6330 /* This will happen in most targets if the current thread is
6335 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6336 &ipa_traceframe_write_count_racy
))
6339 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6340 ipa_traceframe_write_count_racy
6341 - ipa_traceframe_read_count_racy
,
6342 ipa_traceframe_write_count_racy
,
6343 ipa_traceframe_read_count_racy
);
6345 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6348 about_to_request_buffer_space_bkpt
6349 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6352 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6353 &ipa_trace_buffer_ctrl_curr
))
6356 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6358 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6361 unsigned int prev
, counter
;
6363 /* Update the token, with new counters, and the GDBserver stamp
6364 bit. Alway reuse the current TBC index. */
6365 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6366 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6368 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6374 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6375 ipa_trace_buffer_ctrl_curr
))
6378 trace_debug ("Lib: Committed %08x -> %08x",
6379 ipa_trace_buffer_ctrl_curr_old
,
6380 ipa_trace_buffer_ctrl_curr
);
6382 /* Re-read these, now that we've installed the
6383 `about_to_request_buffer_space' breakpoint/lock. A thread could
6384 have finished a traceframe between the last read of these
6385 counters and setting the breakpoint above. If we start
6386 uploading, we never want to leave this function with
6387 traceframe_read_count != 0, otherwise, GDBserver could end up
6388 incrementing the counter tokens more than once (due to event loop
6389 nesting), which would break the IP agent's "effective" detection
6390 (see trace_alloc_trace_buffer). */
6391 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6392 &ipa_traceframe_read_count
))
6394 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6395 &ipa_traceframe_write_count
))
6400 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6401 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6402 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6404 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6405 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6406 trace_debug ("note that ipa_traceframe_count's parts changed");
6409 /* Get the address of the current TBC object (the IP agent has an
6410 array of 3 such objects). The index is stored in the TBC
6412 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6413 ipa_trace_buffer_ctrl_addr
6414 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6416 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6417 (unsigned char *) &ipa_trace_buffer_ctrl
,
6418 sizeof (struct ipa_trace_buffer_control
)))
6421 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6422 &ipa_trace_buffer_lo
))
6424 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6425 &ipa_trace_buffer_hi
))
6428 /* Offsets are easier to grok for debugging than raw addresses,
6429 especially for the small trace buffer sizes that are useful for
6431 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6432 "endfree=%d wrap=%d hi=%d",
6434 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6435 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6436 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6437 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6438 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6440 /* Note that the IPA's buffer is always circular. */
6442 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6444 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6445 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6447 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6448 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6449 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6450 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6453 tf
= IPA_FIRST_TRACEFRAME ();
6455 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6457 struct tracepoint
*tpoint
;
6458 struct traceframe
*tframe
;
6459 unsigned char *block
;
6460 struct traceframe ipa_tframe
;
6462 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6463 offsetof (struct traceframe
, data
)))
6464 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6466 if (ipa_tframe
.tpnum
== 0)
6468 internal_error (__FILE__
, __LINE__
,
6469 "Uploading: No (more) fast traceframes, but"
6470 " ipa_traceframe_count == %u??\n",
6471 ipa_traceframe_write_count
6472 - ipa_traceframe_read_count
);
6475 /* Note that this will be incorrect for multi-location
6477 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6479 tframe
= add_traceframe (tpoint
);
6482 trace_buffer_is_full
= 1;
6483 trace_debug ("Uploading: trace buffer is full");
6487 /* Copy the whole set of blocks in one go for now. FIXME:
6488 split this in smaller blocks. */
6489 block
= add_traceframe_block (tframe
, tpoint
,
6490 ipa_tframe
.data_size
);
6493 if (read_inferior_memory (tf
6494 + offsetof (struct traceframe
, data
),
6495 block
, ipa_tframe
.data_size
))
6496 error ("Uploading: Couldn't read traceframe data at %s\n",
6497 paddress (tf
+ offsetof (struct traceframe
, data
)));
6500 trace_debug ("Uploading: traceframe didn't fit");
6501 finish_traceframe (tframe
);
6504 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6506 /* If we freed the traceframe that wrapped around, go back
6507 to the non-wrap case. */
6508 if (tf
< ipa_trace_buffer_ctrl
.start
)
6510 trace_debug ("Lib: Discarding past the wraparound");
6511 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6513 ipa_trace_buffer_ctrl
.start
= tf
;
6514 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6515 ++ipa_traceframe_read_count
;
6517 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6518 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6520 trace_debug ("Lib: buffer is fully empty. "
6521 "Trace buffer [%d] start=%d free=%d endfree=%d",
6523 (int) (ipa_trace_buffer_ctrl
.start
6524 - ipa_trace_buffer_lo
),
6525 (int) (ipa_trace_buffer_ctrl
.free
6526 - ipa_trace_buffer_lo
),
6527 (int) (ipa_trace_buffer_ctrl
.end_free
6528 - ipa_trace_buffer_lo
));
6530 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6531 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6532 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6533 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6536 trace_debug ("Uploaded a traceframe\n"
6537 "Lib: Trace buffer [%d] start=%d free=%d "
6538 "endfree=%d wrap=%d hi=%d",
6540 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6541 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6542 (int) (ipa_trace_buffer_ctrl
.end_free
6543 - ipa_trace_buffer_lo
),
6544 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6545 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6548 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6549 (unsigned char *) &ipa_trace_buffer_ctrl
,
6550 sizeof (struct ipa_trace_buffer_control
)))
6553 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6554 ipa_traceframe_read_count
);
6556 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6560 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6561 about_to_request_buffer_space_bkpt
= NULL
;
6565 if (trace_buffer_is_full
)
6570 #ifdef IN_PROCESS_AGENT
6572 IP_AGENT_EXPORT_VAR
int ust_loaded
;
6573 IP_AGENT_EXPORT_VAR
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6577 /* Static tracepoints. */
6579 /* UST puts a "struct tracepoint" in the global namespace, which
6580 conflicts with our tracepoint. Arguably, being a library, it
6581 shouldn't take ownership of such a generic name. We work around it
6583 #define tracepoint ust_tracepoint
6584 #include <ust/ust.h>
6587 extern int serialize_to_text (char *outbuf
, int bufsize
,
6588 const char *fmt
, va_list ap
);
6590 #define GDB_PROBE_NAME "gdb"
6592 /* We dynamically search for the UST symbols instead of linking them
6593 in. This lets the user decide if the application uses static
6594 tracepoints, instead of always pulling libust.so in. This vector
6595 holds pointers to all functions we care about. */
6599 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6600 const char *fmt
, va_list ap
);
6602 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6603 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6605 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6607 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6610 void (*marker_iter_start
) (struct marker_iter
*iter
);
6611 void (*marker_iter_next
) (struct marker_iter
*iter
);
6612 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6613 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6618 /* Cast through typeof to catch incompatible API changes. Since UST
6619 only builds with gcc, we can freely use gcc extensions here
6621 #define GET_UST_SYM(SYM) \
6624 if (ust_ops.SYM == NULL) \
6625 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6626 if (ust_ops.SYM == NULL) \
6630 #define USTF(SYM) ust_ops.SYM
6632 /* Get pointers to all libust.so functions we care about. */
6637 GET_UST_SYM (serialize_to_text
);
6639 GET_UST_SYM (ltt_probe_register
);
6640 GET_UST_SYM (ltt_probe_unregister
);
6641 GET_UST_SYM (ltt_marker_connect
);
6642 GET_UST_SYM (ltt_marker_disconnect
);
6644 GET_UST_SYM (marker_iter_start
);
6645 GET_UST_SYM (marker_iter_next
);
6646 GET_UST_SYM (marker_iter_stop
);
6647 GET_UST_SYM (marker_iter_reset
);
6653 /* Given an UST marker, return the matching gdb static tracepoint.
6654 The match is done by address. */
6656 static struct tracepoint
*
6657 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6659 struct tracepoint
*tpoint
;
6661 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6663 if (tpoint
->type
!= static_tracepoint
)
6666 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6673 /* The probe function we install on lttng/ust markers. Whenever a
6674 probed ust marker is hit, this function is called. This is similar
6675 to gdb_collect, only for static tracepoints, instead of fast
6679 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6680 struct registers
*regs
, void *call_private
,
6681 const char *fmt
, va_list *args
)
6683 struct tracepoint
*tpoint
;
6684 struct static_tracepoint_ctx ctx
;
6685 const struct target_desc
*ipa_tdesc
;
6687 /* Don't do anything until the trace run is completely set up. */
6690 trace_debug ("gdb_probe: not tracing\n");
6694 ipa_tdesc
= get_ipa_tdesc (ipa_tdesc_idx
);
6695 ctx
.base
.type
= static_tracepoint
;
6696 ctx
.regcache_initted
= 0;
6701 /* Wrap the regblock in a register cache (in the stack, we don't
6702 want to malloc here). */
6703 ctx
.regspace
= alloca (ipa_tdesc
->registers_size
);
6704 if (ctx
.regspace
== NULL
)
6706 trace_debug ("Trace buffer block allocation failed, skipping");
6710 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6713 trace_debug ("gdb_probe: marker not known: "
6714 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6715 mdata
->location
, mdata
->channel
,
6716 mdata
->name
, mdata
->format
);
6720 if (!tpoint
->enabled
)
6722 trace_debug ("gdb_probe: tracepoint disabled");
6726 ctx
.tpoint
= tpoint
;
6728 trace_debug ("gdb_probe: collecting marker: "
6729 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6730 mdata
->location
, mdata
->channel
,
6731 mdata
->name
, mdata
->format
);
6733 /* Test the condition if present, and collect if true. */
6734 if (tpoint
->cond
== NULL
6735 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6738 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6739 tpoint
->address
, tpoint
);
6741 if (stopping_tracepoint
6742 || trace_buffer_is_full
6743 || expr_eval_result
!= expr_eval_no_error
)
6748 /* If there was a condition and it evaluated to false, the only
6749 way we would stop tracing is if there was an error during
6750 condition expression evaluation. */
6751 if (expr_eval_result
!= expr_eval_no_error
)
6756 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6757 static tracepoint string data. This is a string passed to the
6758 tracing library by the user, at the time of the tracepoint marker
6759 call. E.g., in the UST marker call:
6761 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6763 the collected data is "str FOOBAZ".
6767 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6768 struct traceframe
*tframe
)
6770 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6771 unsigned char *bufspace
;
6774 unsigned short blocklen
;
6778 trace_debug ("Wanted to collect static trace data, "
6779 "but there's no static trace data");
6783 va_copy (copy
, *umd
->args
);
6784 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6787 trace_debug ("Want to collect ust data");
6789 /* 'S' + size + string */
6790 bufspace
= add_traceframe_block (tframe
, umd
->tpoint
,
6791 1 + sizeof (blocklen
) + size
+ 1);
6792 if (bufspace
== NULL
)
6794 trace_debug ("Trace buffer block allocation failed, skipping");
6798 /* Identify a static trace data block. */
6801 blocklen
= size
+ 1;
6802 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6804 va_copy (copy
, *umd
->args
);
6805 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6806 size
+ 1, umd
->fmt
, copy
);
6809 trace_debug ("Storing static tracepoint data in regblock: %s",
6810 bufspace
+ 1 + sizeof (blocklen
));
6813 /* The probe to register with lttng/ust. */
6814 static struct ltt_available_probe gdb_ust_probe
=
6821 #endif /* HAVE_UST */
6822 #endif /* IN_PROCESS_AGENT */
6824 #ifndef IN_PROCESS_AGENT
6826 /* Ask the in-process agent to run a command. Since we don't want to
6827 have to handle the IPA hitting breakpoints while running the
6828 command, we pause all threads, remove all breakpoints, and then set
6829 the helper thread re-running. We communicate with the helper
6830 thread by means of direct memory xfering, and a socket for
6834 run_inferior_command (char *cmd
, int len
)
6837 int pid
= ptid_get_pid (current_ptid
);
6839 trace_debug ("run_inferior_command: running: %s", cmd
);
6842 uninsert_all_breakpoints ();
6844 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6846 reinsert_all_breakpoints ();
6852 #else /* !IN_PROCESS_AGENT */
6854 #include <sys/socket.h>
6857 #ifndef UNIX_PATH_MAX
6858 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6861 /* Where we put the socked used for synchronization. */
6862 #define SOCK_DIR P_tmpdir
6864 /* Thread ID of the helper thread. GDBserver reads this to know which
6865 is the help thread. This is an LWP id on Linux. */
6867 IP_AGENT_EXPORT_VAR
int helper_thread_id
;
6871 init_named_socket (const char *name
)
6874 struct sockaddr_un addr
;
6876 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6879 warning ("socket creation failed: %s", strerror (errno
));
6883 addr
.sun_family
= AF_UNIX
;
6885 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6886 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6888 result
= access (name
, F_OK
);
6892 result
= unlink (name
);
6895 warning ("unlink failed: %s", strerror (errno
));
6899 warning ("socket %s already exists; overwriting", name
);
6902 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6905 warning ("bind failed: %s", strerror (errno
));
6910 result
= listen (fd
, 1);
6913 warning ("listen: %s", strerror (errno
));
6921 static char agent_socket_name
[UNIX_PATH_MAX
];
6924 gdb_agent_socket_init (void)
6928 result
= xsnprintf (agent_socket_name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6929 SOCK_DIR
, getpid ());
6930 if (result
>= UNIX_PATH_MAX
)
6932 trace_debug ("string overflow allocating socket name");
6936 fd
= init_named_socket (agent_socket_name
);
6938 warning ("Error initializing named socket (%s) for communication with the "
6939 "ust helper thread. Check that directory exists and that it "
6940 "is writable.", agent_socket_name
);
6947 /* The next marker to be returned on a qTsSTM command. */
6948 static const struct marker
*next_st
;
6950 /* Returns the first known marker. */
6955 struct marker_iter iter
;
6957 USTF(marker_iter_reset
) (&iter
);
6958 USTF(marker_iter_start
) (&iter
);
6963 /* Returns the marker following M. */
6965 const struct marker
*
6966 next_marker (const struct marker
*m
)
6968 struct marker_iter iter
;
6970 USTF(marker_iter_reset
) (&iter
);
6971 USTF(marker_iter_start
) (&iter
);
6973 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6975 if (iter
.marker
== m
)
6977 USTF(marker_iter_next
) (&iter
);
6985 /* Return an hexstr version of the STR C string, fit for sending to
6989 cstr_to_hexstr (const char *str
)
6991 int len
= strlen (str
);
6992 char *hexstr
= xmalloc (len
* 2 + 1);
6993 bin2hex ((gdb_byte
*) str
, hexstr
, len
);
6997 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
7001 response_ust_marker (char *packet
, const struct marker
*st
)
7003 char *strid
, *format
, *tmp
;
7005 next_st
= next_marker (st
);
7007 tmp
= xmalloc (strlen (st
->channel
) + 1 +
7008 strlen (st
->name
) + 1);
7009 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
7011 strid
= cstr_to_hexstr (tmp
);
7014 format
= cstr_to_hexstr (st
->format
);
7016 sprintf (packet
, "m%s:%s:%s",
7017 paddress ((uintptr_t) st
->location
),
7025 /* Return the first static tracepoint, and initialize the state
7026 machine that will iterate through all the static tracepoints. */
7029 cmd_qtfstm (char *packet
)
7031 trace_debug ("Returning first trace state variable definition");
7033 if (first_marker ())
7034 response_ust_marker (packet
, first_marker ());
7036 strcpy (packet
, "l");
7039 /* Return additional trace state variable definitions. */
7042 cmd_qtsstm (char *packet
)
7044 trace_debug ("Returning static tracepoint");
7047 response_ust_marker (packet
, next_st
);
7049 strcpy (packet
, "l");
7052 /* Disconnect the GDB probe from a marker at a given address. */
7055 unprobe_marker_at (char *packet
)
7059 struct marker_iter iter
;
7061 p
+= sizeof ("unprobe_marker_at:") - 1;
7063 p
= unpack_varlen_hex (p
, &address
);
7065 USTF(marker_iter_reset
) (&iter
);
7066 USTF(marker_iter_start
) (&iter
);
7067 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
7068 if ((uintptr_t ) iter
.marker
->location
== address
)
7072 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
7076 warning ("could not disable marker %s/%s",
7077 iter
.marker
->channel
, iter
.marker
->name
);
7082 /* Connect the GDB probe to a marker at a given address. */
7085 probe_marker_at (char *packet
)
7089 struct marker_iter iter
;
7092 p
+= sizeof ("probe_marker_at:") - 1;
7094 p
= unpack_varlen_hex (p
, &address
);
7096 USTF(marker_iter_reset
) (&iter
);
7098 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7100 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7101 if ((uintptr_t ) m
->location
== address
)
7105 trace_debug ("found marker for address. "
7106 "ltt_marker_connect (marker = %s/%s)",
7107 m
->channel
, m
->name
);
7109 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
7111 if (result
&& result
!= -EEXIST
)
7112 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
7113 m
->channel
, m
->name
, -result
);
7117 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
7118 m
->channel
, m
->name
);
7122 strcpy (packet
, "OK");
7126 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
7131 cmd_qtstmat (char *packet
)
7135 struct marker_iter iter
;
7138 p
+= sizeof ("qTSTMat:") - 1;
7140 p
= unpack_varlen_hex (p
, &address
);
7142 USTF(marker_iter_reset
) (&iter
);
7144 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7146 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7147 if ((uintptr_t ) m
->location
== address
)
7149 response_ust_marker (packet
, m
);
7153 strcpy (packet
, "l");
7163 USTF(ltt_probe_register
) (&gdb_ust_probe
);
7166 #endif /* HAVE_UST */
7168 #include <sys/syscall.h>
7171 gdb_agent_remove_socket (void)
7173 unlink (agent_socket_name
);
7176 /* Helper thread of agent. */
7179 gdb_agent_helper_thread (void *arg
)
7183 atexit (gdb_agent_remove_socket
);
7187 listen_fd
= gdb_agent_socket_init ();
7189 if (helper_thread_id
== 0)
7190 helper_thread_id
= syscall (SYS_gettid
);
7192 if (listen_fd
== -1)
7194 warning ("could not create sync socket\n");
7201 struct sockaddr_un sockaddr
;
7207 tmp
= sizeof (sockaddr
);
7211 fd
= accept (listen_fd
, (struct sockaddr
*) &sockaddr
, &tmp
);
7213 /* It seems an ERESTARTSYS can escape out of accept. */
7214 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7218 warning ("Accept returned %d, error: %s\n",
7219 fd
, strerror (errno
));
7225 ret
= read (fd
, buf
, 1);
7226 } while (ret
== -1 && errno
== EINTR
);
7230 warning ("reading socket (fd=%d) failed with %s",
7231 fd
, strerror (errno
));
7238 if (startswith (cmd_buf
, "close"))
7243 else if (strcmp ("qTfSTM", cmd_buf
) == 0)
7245 cmd_qtfstm (cmd_buf
);
7247 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7249 cmd_qtsstm (cmd_buf
);
7251 else if (startswith (cmd_buf
, "unprobe_marker_at:"))
7253 unprobe_marker_at (cmd_buf
);
7255 else if (startswith (cmd_buf
, "probe_marker_at:"))
7257 probe_marker_at (cmd_buf
);
7259 else if (startswith (cmd_buf
, "qTSTMat:"))
7261 cmd_qtstmat (cmd_buf
);
7263 #endif /* HAVE_UST */
7266 /* Fix compiler's warning: ignoring return value of 'write'. */
7267 ret
= write (fd
, buf
, 1);
7273 unlink (agent_socket_name
);
7275 /* Sleep endlessly to wait the whole inferior stops. This
7276 thread can not exit because GDB or GDBserver may still need
7277 'current_thread' (representing this thread) to access
7278 inferior memory. Otherwise, this thread exits earlier than
7279 other threads, and 'current_thread' is set to NULL. */
7290 #include <pthread.h>
7293 IP_AGENT_EXPORT_VAR
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7297 gdb_agent_init (void)
7304 /* We want the helper thread to be as transparent as possible, so
7305 have it inherit an all-signals-blocked mask. */
7307 sigfillset (&new_mask
);
7308 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7310 perror_with_name ("pthread_sigmask (1)");
7312 res
= pthread_create (&thread
,
7314 gdb_agent_helper_thread
,
7317 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7319 perror_with_name ("pthread_sigmask (2)");
7321 while (helper_thread_id
== 0)
7329 #include <sys/mman.h>
7332 IP_AGENT_EXPORT_VAR
char *gdb_tp_heap_buffer
;
7333 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer
;
7334 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer_end
;
7335 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer
;
7336 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_end
;
7337 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_error
;
7339 /* Record the result of getting buffer space for fast tracepoint
7340 trampolines. Any error message is copied, since caller may not be
7341 using persistent storage. */
7344 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7346 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7347 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7349 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7351 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7354 static void __attribute__ ((constructor
))
7355 initialize_tracepoint_ftlib (void)
7357 initialize_tracepoint ();
7362 #ifndef HAVE_GETAUXVAL
7363 /* Retrieve the value of TYPE from the auxiliary vector. If TYPE is not
7364 found, 0 is returned. This function is provided if glibc is too old. */
7367 getauxval (unsigned long type
)
7369 unsigned long data
[2];
7370 FILE *f
= fopen ("/proc/self/auxv", "r");
7371 unsigned long value
= 0;
7376 while (fread (data
, sizeof (data
), 1, f
) > 0)
7378 if (data
[0] == type
)
7390 #endif /* IN_PROCESS_AGENT */
7392 /* Return a timestamp, expressed as microseconds of the usual Unix
7393 time. (As the result is a 64-bit number, it will not overflow any
7397 get_timestamp (void)
7399 using namespace std::chrono
;
7401 steady_clock::time_point now
= steady_clock::now ();
7402 return duration_cast
<microseconds
> (now
.time_since_epoch ()).count ();
7406 initialize_tracepoint (void)
7408 /* Start with the default size. */
7409 init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE
);
7411 /* Wire trace state variable 1 to be the timestamp. This will be
7412 uploaded to GDB upon connection and become one of its trace state
7413 variables. (In case you're wondering, if GDB already has a trace
7414 variable numbered 1, it will be renumbered.) */
7415 create_trace_state_variable (1, 0);
7416 set_trace_state_variable_name (1, "trace_timestamp");
7417 set_trace_state_variable_getter (1, get_timestamp
);
7419 #ifdef IN_PROCESS_AGENT
7422 size_t jump_pad_size
;
7424 pagesize
= sysconf (_SC_PAGE_SIZE
);
7426 perror_with_name ("sysconf");
7428 #define SCRATCH_BUFFER_NPAGES 20
7430 jump_pad_size
= pagesize
* SCRATCH_BUFFER_NPAGES
;
7432 gdb_tp_heap_buffer
= (char *) xmalloc (5 * 1024 * 1024);
7433 gdb_jump_pad_buffer
= (char *) alloc_jump_pad_buffer (jump_pad_size
);
7434 if (gdb_jump_pad_buffer
== NULL
)
7435 perror_with_name ("mmap");
7436 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ jump_pad_size
;
7439 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7441 /* It's not a fatal error for something to go wrong with trampoline
7442 buffer setup, but it can be mysterious, so create a channel to
7443 report back on what went wrong, using a fixed size since we may
7444 not be able to allocate space later when the problem occurs. */
7445 gdb_trampoline_buffer_error
= (char *) xmalloc (IPA_BUFSIZ
);
7447 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7449 initialize_low_tracepoint ();