1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2012 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 "gdbthread.h"
33 /* This file is built for both GDBserver, and the in-process
34 agent (IPA), a shared library that includes a tracing agent that is
35 loaded by the inferior to support fast tracepoints. Fast
36 tracepoints (or more accurately, jump based tracepoints) are
37 implemented by patching the tracepoint location with a jump into a
38 small trampoline function whose job is to save the register state,
39 call the in-process tracing agent, and then execute the original
40 instruction that was under the tracepoint jump (possibly adjusted,
41 if PC-relative, or some such).
43 The current synchronization design is pull based. That means,
44 GDBserver does most of the work, by peeking/poking at the inferior
45 agent's memory directly for downloading tracepoint and associated
46 objects, and for uploading trace frames. Whenever the IPA needs
47 something from GDBserver (trace buffer is full, tracing stopped for
48 some reason, etc.) the IPA calls a corresponding hook function
49 where GDBserver has placed a breakpoint.
51 Each of the agents has its own trace buffer. When browsing the
52 trace frames built from slow and fast tracepoints from GDB (tfind
53 mode), there's no guarantee the user is seeing the trace frames in
54 strict chronological creation order, although, GDBserver tries to
55 keep the order relatively reasonable, by syncing the trace buffers
60 static void trace_vdebug (const char *, ...) ATTR_FORMAT (printf
, 1, 2);
63 trace_vdebug (const char *fmt
, ...)
69 vsprintf (buf
, fmt
, ap
);
70 fprintf (stderr
, PROG
"/tracepoint: %s\n", buf
);
74 #define trace_debug_1(level, fmt, args...) \
76 if (level <= debug_threads) \
77 trace_vdebug ((fmt), ##args); \
80 #define trace_debug(FMT, args...) \
81 trace_debug_1 (1, FMT, ##args)
84 # define ATTR_USED __attribute__((used))
85 # define ATTR_NOINLINE __attribute__((noinline))
86 # define ATTR_CONSTRUCTOR __attribute__ ((constructor))
89 # define ATTR_NOINLINE
90 # define ATTR_CONSTRUCTOR
93 /* Make sure the functions the IPA needs to export (symbols GDBserver
94 needs to query GDB about) are exported. */
96 #ifdef IN_PROCESS_AGENT
97 # if defined _WIN32 || defined __CYGWIN__
98 # define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED
101 # define IP_AGENT_EXPORT \
102 __attribute__ ((visibility("default"))) ATTR_USED
104 # define IP_AGENT_EXPORT ATTR_USED
108 # define IP_AGENT_EXPORT
111 /* Prefix exported symbols, for good citizenship. All the symbols
112 that need exporting are defined in this module. */
113 #ifdef IN_PROCESS_AGENT
114 # define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer
115 # define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer
116 # define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end
117 # define gdb_trampoline_buffer gdb_agent_gdb_trampoline_buffer
118 # define gdb_trampoline_buffer_end gdb_agent_gdb_trampoline_buffer_end
119 # define gdb_trampoline_buffer_error gdb_agent_gdb_trampoline_buffer_error
120 # define collecting gdb_agent_collecting
121 # define gdb_collect gdb_agent_gdb_collect
122 # define stop_tracing gdb_agent_stop_tracing
123 # define flush_trace_buffer gdb_agent_flush_trace_buffer
124 # define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space
125 # define trace_buffer_is_full gdb_agent_trace_buffer_is_full
126 # define stopping_tracepoint gdb_agent_stopping_tracepoint
127 # define expr_eval_result gdb_agent_expr_eval_result
128 # define error_tracepoint gdb_agent_error_tracepoint
129 # define tracepoints gdb_agent_tracepoints
130 # define tracing gdb_agent_tracing
131 # define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl
132 # define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr
133 # define trace_buffer_lo gdb_agent_trace_buffer_lo
134 # define trace_buffer_hi gdb_agent_trace_buffer_hi
135 # define traceframe_read_count gdb_agent_traceframe_read_count
136 # define traceframe_write_count gdb_agent_traceframe_write_count
137 # define traceframes_created gdb_agent_traceframes_created
138 # define trace_state_variables gdb_agent_trace_state_variables
139 # define get_raw_reg gdb_agent_get_raw_reg
140 # define get_trace_state_variable_value \
141 gdb_agent_get_trace_state_variable_value
142 # define set_trace_state_variable_value \
143 gdb_agent_set_trace_state_variable_value
144 # define ust_loaded gdb_agent_ust_loaded
145 # define helper_thread_id gdb_agent_helper_thread_id
146 # define cmd_buf gdb_agent_cmd_buf
149 #ifndef IN_PROCESS_AGENT
151 /* Addresses of in-process agent's symbols GDBserver cares about. */
153 struct ipa_sym_addresses
155 CORE_ADDR addr_gdb_tp_heap_buffer
;
156 CORE_ADDR addr_gdb_jump_pad_buffer
;
157 CORE_ADDR addr_gdb_jump_pad_buffer_end
;
158 CORE_ADDR addr_gdb_trampoline_buffer
;
159 CORE_ADDR addr_gdb_trampoline_buffer_end
;
160 CORE_ADDR addr_gdb_trampoline_buffer_error
;
161 CORE_ADDR addr_collecting
;
162 CORE_ADDR addr_gdb_collect
;
163 CORE_ADDR addr_stop_tracing
;
164 CORE_ADDR addr_flush_trace_buffer
;
165 CORE_ADDR addr_about_to_request_buffer_space
;
166 CORE_ADDR addr_trace_buffer_is_full
;
167 CORE_ADDR addr_stopping_tracepoint
;
168 CORE_ADDR addr_expr_eval_result
;
169 CORE_ADDR addr_error_tracepoint
;
170 CORE_ADDR addr_tracepoints
;
171 CORE_ADDR addr_tracing
;
172 CORE_ADDR addr_trace_buffer_ctrl
;
173 CORE_ADDR addr_trace_buffer_ctrl_curr
;
174 CORE_ADDR addr_trace_buffer_lo
;
175 CORE_ADDR addr_trace_buffer_hi
;
176 CORE_ADDR addr_traceframe_read_count
;
177 CORE_ADDR addr_traceframe_write_count
;
178 CORE_ADDR addr_traceframes_created
;
179 CORE_ADDR addr_trace_state_variables
;
180 CORE_ADDR addr_get_raw_reg
;
181 CORE_ADDR addr_get_trace_state_variable_value
;
182 CORE_ADDR addr_set_trace_state_variable_value
;
183 CORE_ADDR addr_ust_loaded
;
192 IPA_SYM(gdb_tp_heap_buffer
),
193 IPA_SYM(gdb_jump_pad_buffer
),
194 IPA_SYM(gdb_jump_pad_buffer_end
),
195 IPA_SYM(gdb_trampoline_buffer
),
196 IPA_SYM(gdb_trampoline_buffer_end
),
197 IPA_SYM(gdb_trampoline_buffer_error
),
199 IPA_SYM(gdb_collect
),
200 IPA_SYM(stop_tracing
),
201 IPA_SYM(flush_trace_buffer
),
202 IPA_SYM(about_to_request_buffer_space
),
203 IPA_SYM(trace_buffer_is_full
),
204 IPA_SYM(stopping_tracepoint
),
205 IPA_SYM(expr_eval_result
),
206 IPA_SYM(error_tracepoint
),
207 IPA_SYM(tracepoints
),
209 IPA_SYM(trace_buffer_ctrl
),
210 IPA_SYM(trace_buffer_ctrl_curr
),
211 IPA_SYM(trace_buffer_lo
),
212 IPA_SYM(trace_buffer_hi
),
213 IPA_SYM(traceframe_read_count
),
214 IPA_SYM(traceframe_write_count
),
215 IPA_SYM(traceframes_created
),
216 IPA_SYM(trace_state_variables
),
217 IPA_SYM(get_raw_reg
),
218 IPA_SYM(get_trace_state_variable_value
),
219 IPA_SYM(set_trace_state_variable_value
),
223 static struct ipa_sym_addresses ipa_sym_addrs
;
225 static int read_inferior_integer (CORE_ADDR symaddr
, int *val
);
227 /* Returns true if both the in-process agent library and the static
228 tracepoints libraries are loaded in the inferior, and agent has
229 capability on static tracepoints. */
232 in_process_agent_supports_ust (void)
236 if (!agent_loaded_p ())
238 warning ("In-process agent not loaded");
242 if (agent_capability_check (AGENT_CAPA_STATIC_TRACE
))
244 /* Agent understands static tracepoint, then check whether UST is in
245 fact loaded in the inferior. */
246 if (read_inferior_integer (ipa_sym_addrs
.addr_ust_loaded
, &loaded
))
248 warning ("Error reading ust_loaded in lib");
259 write_e_ipa_not_loaded (char *buffer
)
262 "E.In-process agent library not loaded in process. "
263 "Fast and static tracepoints unavailable.");
266 /* Write an error to BUFFER indicating that UST isn't loaded in the
270 write_e_ust_not_loaded (char *buffer
)
274 "E.UST library not loaded in process. "
275 "Static tracepoints unavailable.");
277 sprintf (buffer
, "E.GDBserver was built without static tracepoints support");
281 /* If the in-process agent library isn't loaded in the inferior, write
282 an error to BUFFER, and return 1. Otherwise, return 0. */
285 maybe_write_ipa_not_loaded (char *buffer
)
287 if (!agent_loaded_p ())
289 write_e_ipa_not_loaded (buffer
);
295 /* If the in-process agent library and the ust (static tracepoints)
296 library aren't loaded in the inferior, write an error to BUFFER,
297 and return 1. Otherwise, return 0. */
300 maybe_write_ipa_ust_not_loaded (char *buffer
)
302 if (!agent_loaded_p ())
304 write_e_ipa_not_loaded (buffer
);
307 else if (!in_process_agent_supports_ust ())
309 write_e_ust_not_loaded (buffer
);
315 /* Cache all future symbols that the tracepoints module might request.
316 We can not request symbols at arbitrary states in the remote
317 protocol, only when the client tells us that new symbols are
318 available. So when we load the in-process library, make sure to
319 check the entire list. */
322 tracepoint_look_up_symbols (void)
326 if (agent_loaded_p ())
329 for (i
= 0; i
< sizeof (symbol_list
) / sizeof (symbol_list
[0]); i
++)
332 (CORE_ADDR
*) ((char *) &ipa_sym_addrs
+ symbol_list
[i
].offset
);
334 if (look_up_one_symbol (symbol_list
[i
].name
, addrp
, 1) == 0)
337 fprintf (stderr
, "symbol `%s' not found\n", symbol_list
[i
].name
);
342 agent_look_up_symbols (NULL
);
347 /* GDBserver places a breakpoint on the IPA's version (which is a nop)
348 of the "stop_tracing" function. When this breakpoint is hit,
349 tracing stopped in the IPA for some reason. E.g., due to
350 tracepoint reaching the pass count, hitting conditional expression
351 evaluation error, etc.
353 The IPA's trace buffer is never in circular tracing mode: instead,
354 GDBserver's is, and whenever the in-process buffer fills, it calls
355 "flush_trace_buffer", which triggers an internal breakpoint.
356 GDBserver reacts to this breakpoint by pulling the meanwhile
357 collected data. Old frames discarding is always handled on the
360 #ifdef IN_PROCESS_AGENT
362 read_inferior_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
364 memcpy (myaddr
, (void *) (uintptr_t) memaddr
, len
);
368 /* Call this in the functions where GDBserver places a breakpoint, so
369 that the compiler doesn't try to be clever and skip calling the
370 function at all. This is necessary, even if we tell the compiler
371 to not inline said functions. */
373 #if defined(__GNUC__)
374 # define UNKNOWN_SIDE_EFFECTS() asm ("")
376 # define UNKNOWN_SIDE_EFFECTS() do {} while (0)
379 IP_AGENT_EXPORT
void ATTR_USED ATTR_NOINLINE
382 /* GDBserver places breakpoint here. */
383 UNKNOWN_SIDE_EFFECTS();
386 IP_AGENT_EXPORT
void ATTR_USED ATTR_NOINLINE
387 flush_trace_buffer (void)
389 /* GDBserver places breakpoint here. */
390 UNKNOWN_SIDE_EFFECTS();
395 #ifndef IN_PROCESS_AGENT
397 tracepoint_handler (CORE_ADDR address
)
399 trace_debug ("tracepoint_handler: tracepoint at 0x%s hit",
404 /* Breakpoint at "stop_tracing" in the inferior lib. */
405 struct breakpoint
*stop_tracing_bkpt
;
406 static int stop_tracing_handler (CORE_ADDR
);
408 /* Breakpoint at "flush_trace_buffer" in the inferior lib. */
409 struct breakpoint
*flush_trace_buffer_bkpt
;
410 static int flush_trace_buffer_handler (CORE_ADDR
);
412 static void download_trace_state_variables (void);
413 static void upload_fast_traceframes (void);
415 static int run_inferior_command (char *cmd
, int len
);
418 read_inferior_integer (CORE_ADDR symaddr
, int *val
)
420 return read_inferior_memory (symaddr
, (unsigned char *) val
,
425 static int tracepoint_send_agent (struct tracepoint
*tpoint
);
428 read_inferior_uinteger (CORE_ADDR symaddr
, unsigned int *val
)
430 return read_inferior_memory (symaddr
, (unsigned char *) val
,
435 read_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR
*val
)
437 void *pval
= (void *) (uintptr_t) val
;
440 ret
= read_inferior_memory (symaddr
, (unsigned char *) &pval
, sizeof (pval
));
441 *val
= (uintptr_t) pval
;
446 write_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR val
)
448 void *pval
= (void *) (uintptr_t) val
;
449 return write_inferior_memory (symaddr
,
450 (unsigned char *) &pval
, sizeof (pval
));
454 write_inferior_integer (CORE_ADDR symaddr
, int val
)
456 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
460 write_inferior_uinteger (CORE_ADDR symaddr
, unsigned int val
)
462 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
465 static CORE_ADDR
target_malloc (ULONGEST size
);
466 static int write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
);
468 #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \
470 memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \
471 BUF += sizeof ((OBJ)->FIELD); \
476 /* Operations on various types of tracepoint actions. */
478 struct tracepoint_action
;
480 struct tracepoint_action_ops
482 /* Download tracepoint action ACTION to IPA. Return the address of action
484 CORE_ADDR (*download
) (const struct tracepoint_action
*action
);
486 /* Send ACTION to agent via command buffer started from BUFFER. Return
487 updated head of command buffer. */
488 char* (*send
) (char *buffer
, const struct tracepoint_action
*action
);
491 /* Base action. Concrete actions inherit this. */
493 struct tracepoint_action
495 #ifndef IN_PROCESS_AGENT
496 const struct tracepoint_action_ops
*ops
;
501 /* An 'M' (collect memory) action. */
502 struct collect_memory_action
504 struct tracepoint_action base
;
511 /* An 'R' (collect registers) action. */
513 struct collect_registers_action
515 struct tracepoint_action base
;
518 /* An 'X' (evaluate expression) action. */
520 struct eval_expr_action
522 struct tracepoint_action base
;
524 struct agent_expr
*expr
;
527 /* An 'L' (collect static trace data) action. */
528 struct collect_static_trace_data_action
530 struct tracepoint_action base
;
533 #ifndef IN_PROCESS_AGENT
535 m_tracepoint_action_download (const struct tracepoint_action
*action
)
537 int size_in_ipa
= (sizeof (struct collect_memory_action
)
538 - offsetof (struct tracepoint_action
, type
));
539 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
541 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
547 m_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
549 struct collect_memory_action
*maction
550 = (struct collect_memory_action
*) action
;
552 COPY_FIELD_TO_BUF (buffer
, maction
, addr
);
553 COPY_FIELD_TO_BUF (buffer
, maction
, len
);
554 COPY_FIELD_TO_BUF (buffer
, maction
, basereg
);
559 static const struct tracepoint_action_ops m_tracepoint_action_ops
=
561 m_tracepoint_action_download
,
562 m_tracepoint_action_send
,
566 r_tracepoint_action_download (const struct tracepoint_action
*action
)
568 int size_in_ipa
= (sizeof (struct collect_registers_action
)
569 - offsetof (struct tracepoint_action
, type
));
570 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
572 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
579 r_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
584 static const struct tracepoint_action_ops r_tracepoint_action_ops
=
586 r_tracepoint_action_download
,
587 r_tracepoint_action_send
,
590 static CORE_ADDR
download_agent_expr (struct agent_expr
*expr
);
593 x_tracepoint_action_download (const struct tracepoint_action
*action
)
595 int size_in_ipa
= (sizeof (struct eval_expr_action
)
596 - offsetof (struct tracepoint_action
, type
));
597 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
600 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
602 expr
= download_agent_expr (((struct eval_expr_action
*)action
)->expr
);
603 write_inferior_data_ptr (ipa_action
+ offsetof (struct eval_expr_action
, expr
)
604 - offsetof (struct tracepoint_action
, type
),
610 /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL,
611 copy 0 to P. Return updated header of buffer. */
614 agent_expr_send (char *p
, const struct agent_expr
*aexpr
)
616 /* Copy the length of condition first, and then copy its
625 memcpy (p
, &aexpr
->length
, 4);
628 memcpy (p
, aexpr
->bytes
, aexpr
->length
);
635 x_tracepoint_action_send ( char *buffer
, const struct tracepoint_action
*action
)
637 struct eval_expr_action
*eaction
= (struct eval_expr_action
*) action
;
639 return agent_expr_send (buffer
, eaction
->expr
);
642 static const struct tracepoint_action_ops x_tracepoint_action_ops
=
644 x_tracepoint_action_download
,
645 x_tracepoint_action_send
,
649 l_tracepoint_action_download (const struct tracepoint_action
*action
)
651 int size_in_ipa
= (sizeof (struct collect_static_trace_data_action
)
652 - offsetof (struct tracepoint_action
, type
));
653 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
655 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
662 l_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
667 static const struct tracepoint_action_ops l_tracepoint_action_ops
=
669 l_tracepoint_action_download
,
670 l_tracepoint_action_send
,
674 /* This structure describes a piece of the source-level definition of
675 the tracepoint. The contents are not interpreted by the target,
676 but preserved verbatim for uploading upon reconnection. */
680 /* The type of string, such as "cond" for a conditional. */
683 /* The source-level string itself. For the sake of target
684 debugging, we store it in plaintext, even though it is always
685 transmitted in hex. */
688 /* Link to the next one in the list. We link them in the order
689 received, in case some make up an ordered list of commands or
691 struct source_string
*next
;
696 /* Trap based tracepoint. */
699 /* A fast tracepoint implemented with a jump instead of a trap. */
702 /* A static tracepoint, implemented by a program call into a tracing
707 struct tracepoint_hit_ctx
;
709 typedef enum eval_result_type (*condfn
) (struct tracepoint_hit_ctx
*,
712 /* The definition of a tracepoint. */
714 /* Tracepoints may have multiple locations, each at a different
715 address. This can occur with optimizations, template
716 instantiation, etc. Since the locations may be in different
717 scopes, the conditions and actions may be different for each
718 location. Our target version of tracepoints is more like GDB's
719 notion of "breakpoint locations", but we have almost nothing that
720 is not per-location, so we bother having two kinds of objects. The
721 key consequence is that numbers are not unique, and that it takes
722 both number and address to identify a tracepoint uniquely. */
726 /* The number of the tracepoint, as specified by GDB. Several
727 tracepoint objects here may share a number. */
730 /* Address at which the tracepoint is supposed to trigger. Several
731 tracepoints may share an address. */
734 /* Tracepoint type. */
735 enum tracepoint_type type
;
737 /* True if the tracepoint is currently enabled. */
740 /* The number of single steps that will be performed after each
744 /* The number of times the tracepoint may be hit before it will
745 terminate the entire tracing run. */
748 /* Pointer to the agent expression that is the tracepoint's
749 conditional, or NULL if the tracepoint is unconditional. */
750 struct agent_expr
*cond
;
752 /* The list of actions to take when the tracepoint triggers. */
754 struct tracepoint_action
**actions
;
756 /* Count of the times we've hit this tracepoint during the run.
757 Note that while-stepping steps are not counted as "hits". */
760 /* Cached sum of the sizes of traceframes created by this point. */
761 uint64_t traceframe_usage
;
763 CORE_ADDR compiled_cond
;
765 /* Link to the next tracepoint in the list. */
766 struct tracepoint
*next
;
768 #ifndef IN_PROCESS_AGENT
769 /* The list of actions to take when the tracepoint triggers, in
770 string/packet form. */
773 /* The collection of strings that describe the tracepoint as it was
774 entered into GDB. These are not used by the target, but are
775 reported back to GDB upon reconnection. */
776 struct source_string
*source_strings
;
778 /* The number of bytes displaced by fast tracepoints. It may subsume
779 multiple instructions, for multi-byte fast tracepoints. This
780 field is only valid for fast tracepoints. */
783 /* Only for fast tracepoints. */
784 CORE_ADDR obj_addr_on_target
;
786 /* Address range where the original instruction under a fast
787 tracepoint was relocated to. (_end is actually one byte past
789 CORE_ADDR adjusted_insn_addr
;
790 CORE_ADDR adjusted_insn_addr_end
;
792 /* The address range of the piece of the jump pad buffer that was
793 assigned to this fast tracepoint. (_end is actually one byte
796 CORE_ADDR jump_pad_end
;
798 /* The address range of the piece of the trampoline buffer that was
799 assigned to this fast tracepoint. (_end is actually one byte
801 CORE_ADDR trampoline
;
802 CORE_ADDR trampoline_end
;
804 /* The list of actions to take while in a stepping loop. These
805 fields are only valid for patch-based tracepoints. */
806 int num_step_actions
;
807 struct tracepoint_action
**step_actions
;
808 /* Same, but in string/packet form. */
809 char **step_actions_str
;
811 /* Handle returned by the breakpoint or tracepoint module when we
812 inserted the trap or jump, or hooked into a static tracepoint.
813 NULL if we haven't inserted it yet. */
819 #ifndef IN_PROCESS_AGENT
821 /* Given `while-stepping', a thread may be collecting data for more
822 than one tracepoint simultaneously. On the other hand, the same
823 tracepoint with a while-stepping action may be hit by more than one
824 thread simultaneously (but not quite, each thread could be handling
825 a different step). Each thread holds a list of these objects,
826 representing the current step of each while-stepping action being
831 struct wstep_state
*next
;
833 /* The tracepoint number. */
835 /* The tracepoint's address. */
836 CORE_ADDR tp_address
;
838 /* The number of the current step in this 'while-stepping'
845 /* The linked list of all tracepoints. Marked explicitly as used as
846 the in-process library doesn't use it for the fast tracepoints
848 IP_AGENT_EXPORT
struct tracepoint
*tracepoints ATTR_USED
;
850 #ifndef IN_PROCESS_AGENT
852 /* Pointer to the last tracepoint in the list, new tracepoints are
853 linked in at the end. */
855 static struct tracepoint
*last_tracepoint
;
858 /* The first tracepoint to exceed its pass count. */
860 IP_AGENT_EXPORT
struct tracepoint
*stopping_tracepoint
;
862 /* True if the trace buffer is full or otherwise no longer usable. */
864 IP_AGENT_EXPORT
int trace_buffer_is_full
;
866 static enum eval_result_type expr_eval_result
= expr_eval_no_error
;
868 #ifndef IN_PROCESS_AGENT
870 static const char *eval_result_names
[] =
872 "terror:in the attic", /* this should never be reported */
873 "terror:empty expression",
874 "terror:empty stack",
875 "terror:stack overflow",
876 "terror:stack underflow",
877 "terror:unhandled opcode",
878 "terror:unrecognized opcode",
879 "terror:divide by zero"
884 /* The tracepoint in which the error occurred. */
886 static struct tracepoint
*error_tracepoint
;
888 struct trace_state_variable
890 /* This is the name of the variable as used in GDB. The target
891 doesn't use the name, but needs to have it for saving and
892 reconnection purposes. */
895 /* This number identifies the variable uniquely. Numbers may be
896 assigned either by the target (in the case of builtin variables),
897 or by GDB, and are presumed unique during the course of a trace
901 /* The variable's initial value, a 64-bit signed integer always. */
902 LONGEST initial_value
;
904 /* The variable's value, a 64-bit signed integer always. */
907 /* Pointer to a getter function, used to supply computed values. */
908 LONGEST (*getter
) (void);
910 /* Link to the next variable. */
911 struct trace_state_variable
*next
;
914 /* Linked list of all trace state variables. */
916 #ifdef IN_PROCESS_AGENT
917 struct trace_state_variable
*alloced_trace_state_variables
;
920 IP_AGENT_EXPORT
struct trace_state_variable
*trace_state_variables
;
922 /* The results of tracing go into a fixed-size space known as the
923 "trace buffer". Because usage follows a limited number of
924 patterns, we manage it ourselves rather than with malloc. Basic
925 rules are that we create only one trace frame at a time, each is
926 variable in size, they are never moved once created, and we only
927 discard if we are doing a circular buffer, and then only the oldest
928 ones. Each trace frame includes its own size, so we don't need to
929 link them together, and the trace frame number is relative to the
930 first one, so we don't need to record numbers. A trace frame also
931 records the number of the tracepoint that created it. The data
932 itself is a series of blocks, each introduced by a single character
933 and with a defined format. Each type of block has enough
934 type/length info to allow scanners to jump quickly from one block
935 to the next without reading each byte in the block. */
937 /* Trace buffer management would be simple - advance a free pointer
938 from beginning to end, then stop - were it not for the circular
939 buffer option, which is a useful way to prevent a trace run from
940 stopping prematurely because the buffer filled up. In the circular
941 case, the location of the first trace frame (trace_buffer_start)
942 moves as old trace frames are discarded. Also, since we grow trace
943 frames incrementally as actions are performed, we wrap around to
944 the beginning of the trace buffer. This is per-block, so each
945 block within a trace frame remains contiguous. Things get messy
946 when the wrapped-around trace frame is the one being discarded; the
947 free space ends up in two parts at opposite ends of the buffer. */
950 # if defined(__GNUC__)
951 # define ATTR_PACKED __attribute__ ((packed))
953 # define ATTR_PACKED /* nothing */
957 /* The data collected at a tracepoint hit. This object should be as
958 small as possible, since there may be a great many of them. We do
959 not need to keep a frame number, because they are all sequential
960 and there are no deletions; so the Nth frame in the buffer is
961 always frame number N. */
965 /* Number of the tracepoint that collected this traceframe. A value
966 of 0 indicates the current end of the trace buffer. We make this
967 a 16-bit field because it's never going to happen that GDB's
968 numbering of tracepoints reaches 32,000. */
971 /* The size of the data in this trace frame. We limit this to 32
972 bits, even on a 64-bit target, because it's just implausible that
973 one is validly going to collect 4 gigabytes of data at a single
975 unsigned int data_size
: 32;
977 /* The base of the trace data, which is contiguous from this point. */
978 unsigned char data
[0];
982 /* The traceframe to be used as the source of data to send back to
983 GDB. A value of -1 means to get data from the live program. */
985 int current_traceframe
= -1;
987 /* This flag is true if the trace buffer is circular, meaning that
988 when it fills, the oldest trace frames are discarded in order to
991 #ifndef IN_PROCESS_AGENT
992 static int circular_trace_buffer
;
995 /* Pointer to the block of memory that traceframes all go into. */
997 static 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 static unsigned char *trace_buffer_hi
;
1004 /* Control structure holding the read/write/etc. pointers into the
1005 trace buffer. We need more than one of these to implement a
1006 transaction-like mechanism to garantees that both GDBserver and the
1007 in-process agent can try to change the trace buffer
1010 struct trace_buffer_control
1012 /* Pointer to the first trace frame in the buffer. In the
1013 non-circular case, this is equal to trace_buffer_lo, otherwise it
1014 moves around in the buffer. */
1015 unsigned char *start
;
1017 /* Pointer to the free part of the trace buffer. Note that we clear
1018 several bytes at and after this pointer, so that traceframe
1019 scans/searches terminate properly. */
1020 unsigned char *free
;
1022 /* Pointer to the byte after the end of the free part. Note that
1023 this may be smaller than trace_buffer_free in the circular case,
1024 and means that the free part is in two pieces. Initially it is
1025 equal to trace_buffer_hi, then is generally equivalent to
1026 trace_buffer_start. */
1027 unsigned char *end_free
;
1029 /* Pointer to the wraparound. If not equal to trace_buffer_hi, then
1030 this is the point at which the trace data breaks, and resumes at
1032 unsigned char *wrap
;
1035 /* Same as above, to be used by GDBserver when updating the in-process
1037 struct ipa_trace_buffer_control
1046 /* We have possibly both GDBserver and an inferior thread accessing
1047 the same IPA trace buffer memory. The IPA is the producer (tries
1048 to put new frames in the buffer), while GDBserver occasionally
1049 consumes them, that is, flushes the IPA's buffer into its own
1050 buffer. Both sides need to update the trace buffer control
1051 pointers (current head, tail, etc.). We can't use a global lock to
1052 synchronize the accesses, as otherwise we could deadlock GDBserver
1053 (if the thread holding the lock stops for a signal, say). So
1054 instead of that, we use a transaction scheme where GDBserver writes
1055 always prevail over the IPAs writes, and, we have the IPA detect
1056 the commit failure/overwrite, and retry the whole attempt. This is
1057 mainly implemented by having a global token object that represents
1058 who wrote last to the buffer control structure. We need to freeze
1059 any inferior writing to the buffer while GDBserver touches memory,
1060 so that the inferior can correctly detect that GDBserver had been
1061 there, otherwise, it could mistakingly think its commit was
1062 successful; that's implemented by simply having GDBserver set a
1063 breakpoint the inferior hits if it is the critical region.
1065 There are three cycling trace buffer control structure copies
1066 (buffer head, tail, etc.), with the token object including an index
1067 indicating which is current live copy. The IPA tentatively builds
1068 an updated copy in a non-current control structure, while GDBserver
1069 always clobbers the current version directly. The IPA then tries
1070 to atomically "commit" its version; if GDBserver clobbered the
1071 structure meanwhile, that will fail, and the IPA restarts the
1074 Listing the step in further detail, we have:
1076 In-process agent (producer):
1078 - passes by `about_to_request_buffer_space' breakpoint/lock
1080 - reads current token, extracts current trace buffer control index,
1081 and starts tentatively updating the rightmost one (0->1, 1->2,
1082 2->0). Note that only one inferior thread is executing this code
1083 at any given time, due to an outer lock in the jump pads.
1085 - updates counters, and tries to commit the token.
1087 - passes by second `about_to_request_buffer_space' breakpoint/lock,
1088 leaving the sync region.
1090 - checks if the update was effective.
1092 - if trace buffer was found full, hits flush_trace_buffer
1093 breakpoint, and restarts later afterwards.
1095 GDBserver (consumer):
1097 - sets `about_to_request_buffer_space' breakpoint/lock.
1099 - updates the token unconditionally, using the current buffer
1100 control index, since it knows that the IP agent always writes to
1101 the rightmost, and due to the breakpoint, at most one IP thread
1102 can try to update the trace buffer concurrently to GDBserver, so
1103 there will be no danger of trace buffer control index wrap making
1104 the IPA write to the same index as GDBserver.
1106 - flushes the IP agent's trace buffer completely, and updates the
1107 current trace buffer control structure. GDBserver *always* wins.
1109 - removes the `about_to_request_buffer_space' breakpoint.
1111 The token is stored in the `trace_buffer_ctrl_curr' variable.
1112 Internally, it's bits are defined as:
1114 |-------------+-----+-------------+--------+-------------+--------------|
1115 | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 |
1116 |-------------+-----+-------------+--------+-------------+--------------|
1117 | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) |
1118 |-------------+-----+-------------+--------+-------------+--------------|
1120 GSB - GDBserver Stamp Bit
1121 PC - Previous Counter
1122 CC - Current Counter
1123 TBCI - Trace Buffer Control Index
1126 An IPA update of `trace_buffer_ctrl_curr' does:
1128 - read CC from the current token, save as PC.
1130 - atomically tries to write PC+1,CC
1132 A GDBserver update of `trace_buffer_ctrl_curr' does:
1134 - reads PC and CC from the current token.
1139 /* These are the bits of `trace_buffer_ctrl_curr' that are reserved
1140 for the counters described below. The cleared bits are used to
1141 hold the index of the items of the `trace_buffer_ctrl' array that
1143 #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0
1145 /* `trace_buffer_ctrl_curr' contains two counters. The `previous'
1146 counter, and the `current' counter. */
1148 #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000
1149 #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00
1151 /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it
1152 always stamps this bit as set. */
1153 #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000
1155 #ifdef IN_PROCESS_AGENT
1156 IP_AGENT_EXPORT
struct trace_buffer_control trace_buffer_ctrl
[3];
1157 IP_AGENT_EXPORT
unsigned int trace_buffer_ctrl_curr
;
1159 # define TRACE_BUFFER_CTRL_CURR \
1160 (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK)
1164 /* The GDBserver side agent only needs one instance of this object, as
1165 it doesn't need to sync with itself. Define it as array anyway so
1166 that the rest of the code base doesn't need to care for the
1168 struct trace_buffer_control trace_buffer_ctrl
[1];
1169 # define TRACE_BUFFER_CTRL_CURR 0
1172 /* These are convenience macros used to access the current trace
1173 buffer control in effect. */
1174 #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start)
1175 #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free)
1176 #define trace_buffer_end_free \
1177 (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free)
1178 #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap)
1181 /* Macro that returns a pointer to the first traceframe in the buffer. */
1183 #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start)
1185 /* Macro that returns a pointer to the next traceframe in the buffer.
1186 If the computed location is beyond the wraparound point, subtract
1187 the offset of the wraparound. */
1189 #define NEXT_TRACEFRAME_1(TF) \
1190 (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size)
1192 #define NEXT_TRACEFRAME(TF) \
1193 ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \
1194 - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \
1195 ? (trace_buffer_wrap - trace_buffer_lo) \
1198 /* The difference between these counters represents the total number
1199 of complete traceframes present in the trace buffer. The IP agent
1200 writes to the write count, GDBserver writes to read count. */
1202 IP_AGENT_EXPORT
unsigned int traceframe_write_count
;
1203 IP_AGENT_EXPORT
unsigned int traceframe_read_count
;
1205 /* Convenience macro. */
1207 #define traceframe_count \
1208 ((unsigned int) (traceframe_write_count - traceframe_read_count))
1210 /* The count of all traceframes created in the current run, including
1211 ones that were discarded to make room. */
1213 IP_AGENT_EXPORT
int traceframes_created
;
1215 #ifndef IN_PROCESS_AGENT
1217 /* Read-only regions are address ranges whose contents don't change,
1218 and so can be read from target memory even while looking at a trace
1219 frame. Without these, disassembly for instance will likely fail,
1220 because the program code is not usually collected into a trace
1221 frame. This data structure does not need to be very complicated or
1222 particularly efficient, it's only going to be used occasionally,
1223 and only by some commands. */
1225 struct readonly_region
1227 /* The bounds of the region. */
1228 CORE_ADDR start
, end
;
1230 /* Link to the next one. */
1231 struct readonly_region
*next
;
1234 /* Linked list of readonly regions. This list stays in effect from
1235 one tstart to the next. */
1237 static struct readonly_region
*readonly_regions
;
1241 /* The global that controls tracing overall. */
1243 IP_AGENT_EXPORT
int tracing
;
1245 #ifndef IN_PROCESS_AGENT
1247 /* Controls whether tracing should continue after GDB disconnects. */
1249 int disconnected_tracing
;
1251 /* The reason for the last tracing run to have stopped. We initialize
1252 to a distinct string so that GDB can distinguish between "stopped
1253 after running" and "stopped because never run" cases. */
1255 static const char *tracing_stop_reason
= "tnotrun";
1257 static int tracing_stop_tpnum
;
1259 /* 64-bit timestamps for the trace run's start and finish, expressed
1260 in microseconds from the Unix epoch. */
1262 LONGEST tracing_start_time
;
1263 LONGEST tracing_stop_time
;
1265 /* The (optional) user-supplied name of the user that started the run.
1266 This is an arbitrary string, and may be NULL. */
1268 char *tracing_user_name
;
1270 /* Optional user-supplied text describing the run. This is
1271 an arbitrary string, and may be NULL. */
1273 char *tracing_notes
;
1275 /* Optional user-supplied text explaining a tstop command. This is an
1276 arbitrary string, and may be NULL. */
1278 char *tracing_stop_note
;
1282 /* Functions local to this file. */
1284 /* Base "class" for tracepoint type specific data to be passed down to
1285 collect_data_at_tracepoint. */
1286 struct tracepoint_hit_ctx
1288 enum tracepoint_type type
;
1291 #ifdef IN_PROCESS_AGENT
1293 /* Fast/jump tracepoint specific data to be passed down to
1294 collect_data_at_tracepoint. */
1295 struct fast_tracepoint_ctx
1297 struct tracepoint_hit_ctx base
;
1299 struct regcache regcache
;
1300 int regcache_initted
;
1301 unsigned char *regspace
;
1303 unsigned char *regs
;
1304 struct tracepoint
*tpoint
;
1307 /* Static tracepoint specific data to be passed down to
1308 collect_data_at_tracepoint. */
1309 struct static_tracepoint_ctx
1311 struct tracepoint_hit_ctx base
;
1313 /* The regcache corresponding to the registers state at the time of
1314 the tracepoint hit. Initialized lazily, from REGS. */
1315 struct regcache regcache
;
1316 int regcache_initted
;
1318 /* The buffer space REGCACHE above uses. We use a separate buffer
1319 instead of letting the regcache malloc for both signal safety and
1320 performance reasons; this is allocated on the stack instead. */
1321 unsigned char *regspace
;
1323 /* The register buffer as passed on by lttng/ust. */
1324 struct registers
*regs
;
1326 /* The "printf" formatter and the args the user passed to the marker
1327 call. We use this to be able to collect "static trace data"
1332 /* The GDB tracepoint matching the probed marker that was "hit". */
1333 struct tracepoint
*tpoint
;
1338 /* Static tracepoint specific data to be passed down to
1339 collect_data_at_tracepoint. */
1340 struct trap_tracepoint_ctx
1342 struct tracepoint_hit_ctx base
;
1344 struct regcache
*regcache
;
1349 static enum eval_result_type
1350 eval_tracepoint_agent_expr (struct tracepoint_hit_ctx
*ctx
,
1351 struct traceframe
*tframe
,
1352 struct agent_expr
*aexpr
,
1355 #ifndef IN_PROCESS_AGENT
1356 static CORE_ADDR
traceframe_get_pc (struct traceframe
*tframe
);
1357 static int traceframe_read_tsv (int num
, LONGEST
*val
);
1360 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1361 struct tracepoint
*tpoint
);
1363 #ifndef IN_PROCESS_AGENT
1364 static void clear_readonly_regions (void);
1365 static void clear_installed_tracepoints (void);
1368 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1370 struct tracepoint
*tpoint
);
1371 #ifndef IN_PROCESS_AGENT
1372 static void collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
1374 struct tracepoint
*tpoint
, int current_step
);
1375 static void compile_tracepoint_condition (struct tracepoint
*tpoint
,
1376 CORE_ADDR
*jump_entry
);
1378 static void do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1380 struct tracepoint
*tpoint
,
1381 struct traceframe
*tframe
,
1382 struct tracepoint_action
*taction
);
1384 #ifndef IN_PROCESS_AGENT
1385 static struct tracepoint
*fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR
);
1387 static void install_tracepoint (struct tracepoint
*, char *own_buf
);
1388 static void download_tracepoint (struct tracepoint
*);
1389 static int install_fast_tracepoint (struct tracepoint
*, char *errbuf
);
1390 static void clone_fast_tracepoint (struct tracepoint
*to
,
1391 const struct tracepoint
*from
);
1394 static LONGEST
get_timestamp (void);
1396 #if defined(__GNUC__)
1397 # define memory_barrier() asm volatile ("" : : : "memory")
1399 # define memory_barrier() do {} while (0)
1402 /* We only build the IPA if this builtin is supported, and there are
1403 no uses of this in GDBserver itself, so we're safe in defining this
1405 #define cmpxchg(mem, oldval, newval) \
1406 __sync_val_compare_and_swap (mem, oldval, newval)
1408 /* Record that an error occurred during expression evaluation. */
1411 record_tracepoint_error (struct tracepoint
*tpoint
, const char *which
,
1412 enum eval_result_type rtype
)
1414 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1415 tpoint
->number
, paddress (tpoint
->address
), which
, rtype
);
1417 #ifdef IN_PROCESS_AGENT
1418 /* Only record the first error we get. */
1419 if (cmpxchg (&expr_eval_result
,
1421 rtype
) != expr_eval_no_error
)
1424 if (expr_eval_result
!= expr_eval_no_error
)
1428 error_tracepoint
= tpoint
;
1431 /* Trace buffer management. */
1434 clear_trace_buffer (void)
1436 trace_buffer_start
= trace_buffer_lo
;
1437 trace_buffer_free
= trace_buffer_lo
;
1438 trace_buffer_end_free
= trace_buffer_hi
;
1439 trace_buffer_wrap
= trace_buffer_hi
;
1440 /* A traceframe with zeroed fields marks the end of trace data. */
1441 ((struct traceframe
*) trace_buffer_free
)->tpnum
= 0;
1442 ((struct traceframe
*) trace_buffer_free
)->data_size
= 0;
1443 traceframe_read_count
= traceframe_write_count
= 0;
1444 traceframes_created
= 0;
1447 #ifndef IN_PROCESS_AGENT
1450 clear_inferior_trace_buffer (void)
1452 CORE_ADDR ipa_trace_buffer_lo
;
1453 CORE_ADDR ipa_trace_buffer_hi
;
1454 struct traceframe ipa_traceframe
= { 0 };
1455 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
1457 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
1458 &ipa_trace_buffer_lo
);
1459 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
1460 &ipa_trace_buffer_hi
);
1462 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
1463 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
1464 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
1465 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
1467 /* A traceframe with zeroed fields marks the end of trace data. */
1468 write_inferior_memory (ipa_sym_addrs
.addr_trace_buffer_ctrl
,
1469 (unsigned char *) &ipa_trace_buffer_ctrl
,
1470 sizeof (ipa_trace_buffer_ctrl
));
1472 write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
, 0);
1474 /* A traceframe with zeroed fields marks the end of trace data. */
1475 write_inferior_memory (ipa_trace_buffer_lo
,
1476 (unsigned char *) &ipa_traceframe
,
1477 sizeof (ipa_traceframe
));
1479 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
, 0);
1480 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
, 0);
1481 write_inferior_integer (ipa_sym_addrs
.addr_traceframes_created
, 0);
1487 init_trace_buffer (unsigned char *buf
, int bufsize
)
1489 trace_buffer_lo
= buf
;
1490 trace_buffer_hi
= trace_buffer_lo
+ bufsize
;
1492 clear_trace_buffer ();
1495 #ifdef IN_PROCESS_AGENT
1497 IP_AGENT_EXPORT
void ATTR_USED ATTR_NOINLINE
1498 about_to_request_buffer_space (void)
1500 /* GDBserver places breakpoint here while it goes about to flush
1501 data at random times. */
1502 UNKNOWN_SIDE_EFFECTS();
1507 /* Carve out a piece of the trace buffer, returning NULL in case of
1511 trace_buffer_alloc (size_t amt
)
1513 unsigned char *rslt
;
1514 struct trace_buffer_control
*tbctrl
;
1516 #ifdef IN_PROCESS_AGENT
1517 unsigned int prev
, prev_filtered
;
1518 unsigned int commit_count
;
1519 unsigned int commit
;
1520 unsigned int readout
;
1522 struct traceframe
*oldest
;
1523 unsigned char *new_start
;
1526 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1527 (long) amt
, (long) sizeof (struct traceframe
));
1529 /* Account for the EOB marker. */
1530 amt
+= sizeof (struct traceframe
);
1532 #ifdef IN_PROCESS_AGENT
1536 /* Read the current token and extract the index to try to write to,
1537 storing it in CURR. */
1538 prev
= trace_buffer_ctrl_curr
;
1539 prev_filtered
= prev
& ~GDBSERVER_FLUSH_COUNT_MASK
;
1540 curr
= prev_filtered
+ 1;
1544 about_to_request_buffer_space ();
1546 /* Start out with a copy of the current state. GDBserver may be
1547 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1548 be able to commit anyway if that happens. */
1549 trace_buffer_ctrl
[curr
]
1550 = trace_buffer_ctrl
[prev_filtered
];
1551 trace_debug ("trying curr=%u", curr
);
1553 /* The GDBserver's agent doesn't need all that syncing, and always
1554 updates TCB 0 (there's only one, mind you). */
1557 tbctrl
= &trace_buffer_ctrl
[curr
];
1559 /* Offsets are easier to grok for debugging than raw addresses,
1560 especially for the small trace buffer sizes that are useful for
1562 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1564 (int) (tbctrl
->start
- trace_buffer_lo
),
1565 (int) (tbctrl
->free
- trace_buffer_lo
),
1566 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1567 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1568 (int) (trace_buffer_hi
- trace_buffer_lo
));
1570 /* The algorithm here is to keep trying to get a contiguous block of
1571 the requested size, possibly discarding older traceframes to free
1572 up space. Since free space might come in one or two pieces,
1573 depending on whether discarded traceframes wrapped around at the
1574 high end of the buffer, we test both pieces after each
1578 /* First, if we have two free parts, try the upper one first. */
1579 if (tbctrl
->end_free
< tbctrl
->free
)
1581 if (tbctrl
->free
+ amt
<= trace_buffer_hi
)
1582 /* We have enough in the upper part. */
1586 /* Our high part of free space wasn't enough. Give up
1587 on it for now, set wraparound. We will recover the
1588 space later, if/when the wrapped-around traceframe is
1590 trace_debug ("Upper part too small, setting wraparound");
1591 tbctrl
->wrap
= tbctrl
->free
;
1592 tbctrl
->free
= trace_buffer_lo
;
1596 /* The normal case. */
1597 if (tbctrl
->free
+ amt
<= tbctrl
->end_free
)
1600 #ifdef IN_PROCESS_AGENT
1601 /* The IP Agent's buffer is always circular. It isn't used
1602 currently, but `circular_trace_buffer' could represent
1603 GDBserver's mode. If we didn't find space, ask GDBserver to
1606 flush_trace_buffer ();
1610 trace_debug ("gdbserver flushed buffer, retrying");
1614 /* GDBserver cancelled the tracing. Bail out as well. */
1617 /* If we're here, then neither part is big enough, and
1618 non-circular trace buffers are now full. */
1619 if (!circular_trace_buffer
)
1621 trace_debug ("Not enough space in the trace buffer");
1625 trace_debug ("Need more space in the trace buffer");
1627 /* If we have a circular buffer, we can try discarding the
1628 oldest traceframe and see if that helps. */
1629 oldest
= FIRST_TRACEFRAME ();
1630 if (oldest
->tpnum
== 0)
1632 /* Not good; we have no traceframes to free. Perhaps we're
1633 asking for a block that is larger than the buffer? In
1634 any case, give up. */
1635 trace_debug ("No traceframes to discard");
1639 /* We don't run this code in the in-process agent currently.
1640 E.g., we could leave the in-process agent in autonomous
1641 circular mode if we only have fast tracepoints. If we do
1642 that, then this bit becomes racy with GDBserver, which also
1643 writes to this counter. */
1644 --traceframe_write_count
;
1646 new_start
= (unsigned char *) NEXT_TRACEFRAME (oldest
);
1647 /* If we freed the traceframe that wrapped around, go back
1648 to the non-wrap case. */
1649 if (new_start
< tbctrl
->start
)
1651 trace_debug ("Discarding past the wraparound");
1652 tbctrl
->wrap
= trace_buffer_hi
;
1654 tbctrl
->start
= new_start
;
1655 tbctrl
->end_free
= tbctrl
->start
;
1657 trace_debug ("Discarded a traceframe\n"
1658 "Trace buffer [%d], start=%d free=%d "
1659 "endfree=%d wrap=%d hi=%d",
1661 (int) (tbctrl
->start
- trace_buffer_lo
),
1662 (int) (tbctrl
->free
- trace_buffer_lo
),
1663 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1664 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1665 (int) (trace_buffer_hi
- trace_buffer_lo
));
1667 /* Now go back around the loop. The discard might have resulted
1668 in either one or two pieces of free space, so we want to try
1669 both before freeing any more traceframes. */
1673 /* If we get here, we know we can provide the asked-for space. */
1675 rslt
= tbctrl
->free
;
1677 /* Adjust the request back down, now that we know we have space for
1678 the marker, but don't commit to AMT yet, we may still need to
1679 restart the operation if GDBserver touches the trace buffer
1680 (obviously only important in the in-process agent's version). */
1681 tbctrl
->free
+= (amt
- sizeof (struct traceframe
));
1683 /* Or not. If GDBserver changed the trace buffer behind our back,
1684 we get to restart a new allocation attempt. */
1686 #ifdef IN_PROCESS_AGENT
1687 /* Build the tentative token. */
1688 commit_count
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) + 0x100)
1689 & GDBSERVER_FLUSH_COUNT_MASK_CURR
);
1690 commit
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) << 12)
1694 /* Try to commit it. */
1695 readout
= cmpxchg (&trace_buffer_ctrl_curr
, prev
, commit
);
1696 if (readout
!= prev
)
1698 trace_debug ("GDBserver has touched the trace buffer, restarting."
1699 " (prev=%08x, commit=%08x, readout=%08x)",
1700 prev
, commit
, readout
);
1704 /* Hold your horses here. Even if that change was committed,
1705 GDBserver could come in, and clobber it. We need to hold to be
1706 able to tell if GDBserver clobbers before or after we committed
1707 the change. Whenever GDBserver goes about touching the IPA
1708 buffer, it sets a breakpoint in this routine, so we have a sync
1710 about_to_request_buffer_space ();
1712 /* Check if the change has been effective, even if GDBserver stopped
1713 us at the breakpoint. */
1716 unsigned int refetch
;
1720 refetch
= trace_buffer_ctrl_curr
;
1722 if (refetch
== commit
1723 || ((refetch
& GDBSERVER_FLUSH_COUNT_MASK_PREV
) >> 12) == commit_count
)
1726 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1727 "readout=%08x, refetch=%08x)",
1728 prev
, commit
, readout
, refetch
);
1732 trace_debug ("GDBserver has touched the trace buffer, not effective."
1733 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1734 prev
, commit
, readout
, refetch
);
1740 /* We have a new piece of the trace buffer. Hurray! */
1742 /* Add an EOB marker just past this allocation. */
1743 ((struct traceframe
*) tbctrl
->free
)->tpnum
= 0;
1744 ((struct traceframe
*) tbctrl
->free
)->data_size
= 0;
1746 /* Adjust the request back down, now that we know we have space for
1748 amt
-= sizeof (struct traceframe
);
1752 trace_debug ("Allocated %d bytes", (int) amt
);
1753 trace_debug ("Trace buffer [%d] start=%d free=%d "
1754 "endfree=%d wrap=%d hi=%d",
1756 (int) (tbctrl
->start
- trace_buffer_lo
),
1757 (int) (tbctrl
->free
- trace_buffer_lo
),
1758 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1759 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1760 (int) (trace_buffer_hi
- trace_buffer_lo
));
1766 #ifndef IN_PROCESS_AGENT
1768 /* Return the total free space. This is not necessarily the largest
1769 block we can allocate, because of the two-part case. */
1774 if (trace_buffer_free
<= trace_buffer_end_free
)
1775 return trace_buffer_end_free
- trace_buffer_free
;
1777 return ((trace_buffer_end_free
- trace_buffer_lo
)
1778 + (trace_buffer_hi
- trace_buffer_free
));
1781 /* An 'S' in continuation packets indicates remainder are for
1784 static int seen_step_action_flag
;
1786 /* Create a tracepoint (location) with given number and address. Add this
1787 new tracepoint to list and sort this list. */
1789 static struct tracepoint
*
1790 add_tracepoint (int num
, CORE_ADDR addr
)
1792 struct tracepoint
*tpoint
, **tp_next
;
1794 tpoint
= xmalloc (sizeof (struct tracepoint
));
1795 tpoint
->number
= num
;
1796 tpoint
->address
= addr
;
1797 tpoint
->numactions
= 0;
1798 tpoint
->actions
= NULL
;
1799 tpoint
->actions_str
= NULL
;
1800 tpoint
->cond
= NULL
;
1801 tpoint
->num_step_actions
= 0;
1802 tpoint
->step_actions
= NULL
;
1803 tpoint
->step_actions_str
= NULL
;
1804 /* Start all off as regular (slow) tracepoints. */
1805 tpoint
->type
= trap_tracepoint
;
1806 tpoint
->orig_size
= -1;
1807 tpoint
->source_strings
= NULL
;
1808 tpoint
->compiled_cond
= 0;
1809 tpoint
->handle
= NULL
;
1810 tpoint
->next
= NULL
;
1812 /* Find a place to insert this tracepoint into list in order to keep
1813 the tracepoint list still in the ascending order. There may be
1814 multiple tracepoints at the same address as TPOINT's, and this
1815 guarantees TPOINT is inserted after all the tracepoints which are
1816 set at the same address. For example, fast tracepoints A, B, C are
1817 set at the same address, and D is to be insert at the same place as
1820 -->| A |--> | B |-->| C |->...
1822 One jump pad was created for tracepoint A, B, and C, and the target
1823 address of A is referenced/used in jump pad. So jump pad will let
1824 inferior jump to A. If D is inserted in front of A, like this,
1826 -->| D |-->| A |--> | B |-->| C |->...
1828 without updating jump pad, D is not reachable during collect, which
1829 is wrong. As we can see, the order of B, C and D doesn't matter, but
1830 A should always be the `first' one. */
1831 for (tp_next
= &tracepoints
;
1832 (*tp_next
) != NULL
&& (*tp_next
)->address
<= tpoint
->address
;
1833 tp_next
= &(*tp_next
)->next
)
1835 tpoint
->next
= *tp_next
;
1837 last_tracepoint
= tpoint
;
1839 seen_step_action_flag
= 0;
1844 #ifndef IN_PROCESS_AGENT
1846 /* Return the tracepoint with the given number and address, or NULL. */
1848 static struct tracepoint
*
1849 find_tracepoint (int id
, CORE_ADDR addr
)
1851 struct tracepoint
*tpoint
;
1853 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
1854 if (tpoint
->number
== id
&& tpoint
->address
== addr
)
1860 /* Remove TPOINT from global list. */
1863 remove_tracepoint (struct tracepoint
*tpoint
)
1865 struct tracepoint
*tp
, *tp_prev
;
1867 for (tp
= tracepoints
, tp_prev
= NULL
; tp
&& tp
!= tpoint
;
1868 tp_prev
= tp
, tp
= tp
->next
)
1874 tp_prev
->next
= tp
->next
;
1876 tracepoints
= tp
->next
;
1882 /* There may be several tracepoints with the same number (because they
1883 are "locations", in GDB parlance); return the next one after the
1884 given tracepoint, or search from the beginning of the list if the
1885 first argument is NULL. */
1887 static struct tracepoint
*
1888 find_next_tracepoint_by_number (struct tracepoint
*prev_tp
, int num
)
1890 struct tracepoint
*tpoint
;
1893 tpoint
= prev_tp
->next
;
1895 tpoint
= tracepoints
;
1896 for (; tpoint
; tpoint
= tpoint
->next
)
1897 if (tpoint
->number
== num
)
1906 save_string (const char *str
, size_t len
)
1910 s
= xmalloc (len
+ 1);
1911 memcpy (s
, str
, len
);
1917 /* Append another action to perform when the tracepoint triggers. */
1920 add_tracepoint_action (struct tracepoint
*tpoint
, char *packet
)
1926 seen_step_action_flag
= 1;
1934 char *act_start
= act
;
1935 struct tracepoint_action
*action
= NULL
;
1941 struct collect_memory_action
*maction
;
1945 maction
= xmalloc (sizeof *maction
);
1946 maction
->base
.type
= *act
;
1947 maction
->base
.ops
= &m_tracepoint_action_ops
;
1948 action
= &maction
->base
;
1951 is_neg
= (*act
== '-');
1954 act
= unpack_varlen_hex (act
, &basereg
);
1956 act
= unpack_varlen_hex (act
, &maction
->addr
);
1958 act
= unpack_varlen_hex (act
, &maction
->len
);
1959 maction
->basereg
= (is_neg
1962 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
1963 pulongest (maction
->len
),
1964 paddress (maction
->addr
), maction
->basereg
);
1969 struct collect_registers_action
*raction
;
1971 raction
= xmalloc (sizeof *raction
);
1972 raction
->base
.type
= *act
;
1973 raction
->base
.ops
= &r_tracepoint_action_ops
;
1974 action
= &raction
->base
;
1976 trace_debug ("Want to collect registers");
1978 /* skip past hex digits of mask for now */
1979 while (isxdigit(*act
))
1985 struct collect_static_trace_data_action
*raction
;
1987 raction
= xmalloc (sizeof *raction
);
1988 raction
->base
.type
= *act
;
1989 raction
->base
.ops
= &l_tracepoint_action_ops
;
1990 action
= &raction
->base
;
1992 trace_debug ("Want to collect static trace data");
1997 trace_debug ("Unexpected step action, ignoring");
2002 struct eval_expr_action
*xaction
;
2004 xaction
= xmalloc (sizeof (*xaction
));
2005 xaction
->base
.type
= *act
;
2006 xaction
->base
.ops
= &x_tracepoint_action_ops
;
2007 action
= &xaction
->base
;
2009 trace_debug ("Want to evaluate expression");
2010 xaction
->expr
= gdb_parse_agent_expr (&act
);
2014 trace_debug ("unknown trace action '%c', ignoring...", *act
);
2023 if (seen_step_action_flag
)
2025 tpoint
->num_step_actions
++;
2027 tpoint
->step_actions
2028 = xrealloc (tpoint
->step_actions
,
2029 (sizeof (*tpoint
->step_actions
)
2030 * tpoint
->num_step_actions
));
2031 tpoint
->step_actions_str
2032 = xrealloc (tpoint
->step_actions_str
,
2033 (sizeof (*tpoint
->step_actions_str
)
2034 * tpoint
->num_step_actions
));
2035 tpoint
->step_actions
[tpoint
->num_step_actions
- 1] = action
;
2036 tpoint
->step_actions_str
[tpoint
->num_step_actions
- 1]
2037 = save_string (act_start
, act
- act_start
);
2041 tpoint
->numactions
++;
2043 = xrealloc (tpoint
->actions
,
2044 sizeof (*tpoint
->actions
) * tpoint
->numactions
);
2046 = xrealloc (tpoint
->actions_str
,
2047 sizeof (*tpoint
->actions_str
) * tpoint
->numactions
);
2048 tpoint
->actions
[tpoint
->numactions
- 1] = action
;
2049 tpoint
->actions_str
[tpoint
->numactions
- 1]
2050 = save_string (act_start
, act
- act_start
);
2057 /* Find or create a trace state variable with the given number. */
2059 static struct trace_state_variable
*
2060 get_trace_state_variable (int num
)
2062 struct trace_state_variable
*tsv
;
2064 #ifdef IN_PROCESS_AGENT
2065 /* Search for an existing variable. */
2066 for (tsv
= alloced_trace_state_variables
; tsv
; tsv
= tsv
->next
)
2067 if (tsv
->number
== num
)
2071 /* Search for an existing variable. */
2072 for (tsv
= trace_state_variables
; tsv
; tsv
= tsv
->next
)
2073 if (tsv
->number
== num
)
2079 /* Find or create a trace state variable with the given number. */
2081 static struct trace_state_variable
*
2082 create_trace_state_variable (int num
, int gdb
)
2084 struct trace_state_variable
*tsv
;
2086 tsv
= get_trace_state_variable (num
);
2090 /* Create a new variable. */
2091 tsv
= xmalloc (sizeof (struct trace_state_variable
));
2093 tsv
->initial_value
= 0;
2097 #ifdef IN_PROCESS_AGENT
2100 tsv
->next
= alloced_trace_state_variables
;
2101 alloced_trace_state_variables
= tsv
;
2106 tsv
->next
= trace_state_variables
;
2107 trace_state_variables
= tsv
;
2112 IP_AGENT_EXPORT LONGEST
2113 get_trace_state_variable_value (int num
)
2115 struct trace_state_variable
*tsv
;
2117 tsv
= get_trace_state_variable (num
);
2121 trace_debug ("No trace state variable %d, skipping value get", num
);
2125 /* Call a getter function if we have one. While it's tempting to
2126 set up something to only call the getter once per tracepoint hit,
2127 it could run afoul of thread races. Better to let the getter
2128 handle it directly, if necessary to worry about it. */
2130 tsv
->value
= (tsv
->getter
) ();
2132 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2133 num
, plongest (tsv
->value
));
2138 IP_AGENT_EXPORT
void
2139 set_trace_state_variable_value (int num
, LONGEST val
)
2141 struct trace_state_variable
*tsv
;
2143 tsv
= get_trace_state_variable (num
);
2147 trace_debug ("No trace state variable %d, skipping value set", num
);
2155 agent_get_trace_state_variable_value (int num
)
2157 return get_trace_state_variable_value (num
);
2161 agent_set_trace_state_variable_value (int num
, LONGEST val
)
2163 set_trace_state_variable_value (num
, val
);
2167 set_trace_state_variable_name (int num
, const char *name
)
2169 struct trace_state_variable
*tsv
;
2171 tsv
= get_trace_state_variable (num
);
2175 trace_debug ("No trace state variable %d, skipping name set", num
);
2179 tsv
->name
= (char *) name
;
2183 set_trace_state_variable_getter (int num
, LONGEST (*getter
) (void))
2185 struct trace_state_variable
*tsv
;
2187 tsv
= get_trace_state_variable (num
);
2191 trace_debug ("No trace state variable %d, skipping getter set", num
);
2195 tsv
->getter
= getter
;
2198 /* Add a raw traceframe for the given tracepoint. */
2200 static struct traceframe
*
2201 add_traceframe (struct tracepoint
*tpoint
)
2203 struct traceframe
*tframe
;
2205 tframe
= trace_buffer_alloc (sizeof (struct traceframe
));
2210 tframe
->tpnum
= tpoint
->number
;
2211 tframe
->data_size
= 0;
2216 /* Add a block to the traceframe currently being worked on. */
2218 static unsigned char *
2219 add_traceframe_block (struct traceframe
*tframe
, int amt
)
2221 unsigned char *block
;
2226 block
= trace_buffer_alloc (amt
);
2231 tframe
->data_size
+= amt
;
2236 /* Flag that the current traceframe is finished. */
2239 finish_traceframe (struct traceframe
*tframe
)
2241 ++traceframe_write_count
;
2242 ++traceframes_created
;
2245 #ifndef IN_PROCESS_AGENT
2247 /* Given a traceframe number NUM, find the NUMth traceframe in the
2250 static struct traceframe
*
2251 find_traceframe (int num
)
2253 struct traceframe
*tframe
;
2256 for (tframe
= FIRST_TRACEFRAME ();
2258 tframe
= NEXT_TRACEFRAME (tframe
))
2269 get_traceframe_address (struct traceframe
*tframe
)
2272 struct tracepoint
*tpoint
;
2274 addr
= traceframe_get_pc (tframe
);
2279 /* Fallback strategy, will be incorrect for while-stepping frames
2280 and multi-location tracepoints. */
2281 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2282 return tpoint
->address
;
2285 /* Search for the next traceframe whose address is inside or outside
2288 static struct traceframe
*
2289 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2292 struct traceframe
*tframe
;
2295 *tfnump
= current_traceframe
+ 1;
2296 tframe
= find_traceframe (*tfnump
);
2297 /* The search is not supposed to wrap around. */
2304 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2306 tfaddr
= get_traceframe_address (tframe
);
2308 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2309 : (lo
> tfaddr
|| tfaddr
> hi
))
2318 /* Search for the next traceframe recorded by the given tracepoint.
2319 Note that for multi-location tracepoints, this will find whatever
2320 location appears first. */
2322 static struct traceframe
*
2323 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2325 struct traceframe
*tframe
;
2327 *tfnump
= current_traceframe
+ 1;
2328 tframe
= find_traceframe (*tfnump
);
2329 /* The search is not supposed to wrap around. */
2336 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2338 if (tframe
->tpnum
== num
)
2349 #ifndef IN_PROCESS_AGENT
2351 /* Clear all past trace state. */
2354 cmd_qtinit (char *packet
)
2356 struct trace_state_variable
*tsv
, *prev
, *next
;
2358 /* Make sure we don't try to read from a trace frame. */
2359 current_traceframe
= -1;
2361 trace_debug ("Initializing the trace");
2363 clear_installed_tracepoints ();
2364 clear_readonly_regions ();
2367 last_tracepoint
= NULL
;
2369 /* Clear out any leftover trace state variables. Ones with target
2370 defined getters should be kept however. */
2372 tsv
= trace_state_variables
;
2375 trace_debug ("Looking at var %d", tsv
->number
);
2376 if (tsv
->getter
== NULL
)
2382 trace_state_variables
= next
;
2383 trace_debug ("Deleting var %d", tsv
->number
);
2394 clear_trace_buffer ();
2395 clear_inferior_trace_buffer ();
2400 /* Unprobe the UST marker at ADDRESS. */
2403 unprobe_marker_at (CORE_ADDR address
)
2405 char cmd
[IPA_CMD_BUF_SIZE
];
2407 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2408 run_inferior_command (cmd
, strlen (cmd
) + 1);
2411 /* Restore the program to its pre-tracing state. This routine may be called
2412 in error situations, so it needs to be careful about only restoring
2413 from known-valid bits. */
2416 clear_installed_tracepoints (void)
2418 struct tracepoint
*tpoint
;
2419 struct tracepoint
*prev_stpoint
;
2422 cancel_breakpoints ();
2424 prev_stpoint
= NULL
;
2426 /* Restore any bytes overwritten by tracepoints. */
2427 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2429 /* Catch the case where we might try to remove a tracepoint that
2430 was never actually installed. */
2431 if (tpoint
->handle
== NULL
)
2433 trace_debug ("Tracepoint %d at 0x%s was "
2434 "never installed, nothing to clear",
2435 tpoint
->number
, paddress (tpoint
->address
));
2439 switch (tpoint
->type
)
2441 case trap_tracepoint
:
2442 delete_breakpoint (tpoint
->handle
);
2444 case fast_tracepoint
:
2445 delete_fast_tracepoint_jump (tpoint
->handle
);
2447 case static_tracepoint
:
2448 if (prev_stpoint
!= NULL
2449 && prev_stpoint
->address
== tpoint
->address
)
2450 /* Nothing to do. We already unprobed a tracepoint set at
2451 this marker address (and there can only be one probe
2456 unprobe_marker_at (tpoint
->address
);
2457 prev_stpoint
= tpoint
;
2462 tpoint
->handle
= NULL
;
2468 /* Parse a packet that defines a tracepoint. */
2471 cmd_qtdp (char *own_buf
)
2474 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2475 int trail_hyphen
= 0;
2479 struct tracepoint
*tpoint
;
2481 char *packet
= own_buf
;
2483 packet
+= strlen ("QTDP:");
2485 /* A hyphen at the beginning marks a packet specifying actions for a
2486 tracepoint already supplied. */
2493 packet
= unpack_varlen_hex (packet
, &num
);
2494 ++packet
; /* skip a colon */
2495 packet
= unpack_varlen_hex (packet
, &addr
);
2496 ++packet
; /* skip a colon */
2498 /* See if we already have this tracepoint. */
2499 tpoint
= find_tracepoint (num
, addr
);
2503 /* Duplicate tracepoints are never allowed. */
2506 trace_debug ("Tracepoint error: tracepoint %d"
2507 " at 0x%s already exists",
2508 (int) num
, paddress (addr
));
2509 write_enn (own_buf
);
2513 tpoint
= add_tracepoint (num
, addr
);
2515 tpoint
->enabled
= (*packet
== 'E');
2516 ++packet
; /* skip 'E' */
2517 ++packet
; /* skip a colon */
2518 packet
= unpack_varlen_hex (packet
, &count
);
2519 tpoint
->step_count
= count
;
2520 ++packet
; /* skip a colon */
2521 packet
= unpack_varlen_hex (packet
, &count
);
2522 tpoint
->pass_count
= count
;
2523 /* See if we have any of the additional optional fields. */
2524 while (*packet
== ':')
2529 tpoint
->type
= fast_tracepoint
;
2531 packet
= unpack_varlen_hex (packet
, &count
);
2532 tpoint
->orig_size
= count
;
2534 else if (*packet
== 'S')
2536 tpoint
->type
= static_tracepoint
;
2539 else if (*packet
== 'X')
2541 actparm
= (char *) packet
;
2542 tpoint
->cond
= gdb_parse_agent_expr (&actparm
);
2545 else if (*packet
== '-')
2547 else if (*packet
== '\0')
2550 trace_debug ("Unknown optional tracepoint field");
2555 trace_debug ("Also has actions\n");
2558 trace_debug ("Defined %stracepoint %d at 0x%s, "
2559 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2560 tpoint
->type
== fast_tracepoint
? "fast "
2561 : tpoint
->type
== static_tracepoint
? "static " : "",
2562 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2563 tpoint
->step_count
, tpoint
->pass_count
);
2566 add_tracepoint_action (tpoint
, packet
);
2569 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2570 (int) num
, paddress (addr
));
2571 write_enn (own_buf
);
2575 /* Install tracepoint during tracing only once for each tracepoint location.
2576 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2577 determine the last QTDP packet for one tracepoint location by checking
2578 trailing hyphen in QTDP packet. */
2579 if (tracing
&& !trail_hyphen
)
2581 struct tracepoint
*tp
= NULL
;
2583 /* Pause all threads temporarily while we patch tracepoints. */
2586 /* download_tracepoint will update global `tracepoints'
2587 list, so it is unsafe to leave threads in jump pad. */
2588 stabilize_threads ();
2590 /* Freeze threads. */
2594 if (tpoint
->type
!= trap_tracepoint
)
2596 /* Find another fast or static tracepoint at the same address. */
2597 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2599 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2600 && tp
->number
!= tpoint
->number
)
2604 /* TPOINT is installed at the same address as TP. */
2607 if (tpoint
->type
== fast_tracepoint
)
2608 clone_fast_tracepoint (tpoint
, tp
);
2609 else if (tpoint
->type
== static_tracepoint
)
2610 tpoint
->handle
= (void *) -1;
2614 if (use_agent
&& tpoint
->type
== fast_tracepoint
2615 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2617 /* Download and install fast tracepoint by agent. */
2618 if (tracepoint_send_agent (tpoint
) == 0)
2622 write_enn (own_buf
);
2623 remove_tracepoint (tpoint
);
2628 download_tracepoint (tpoint
);
2630 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2632 install_tracepoint (tpoint
, own_buf
);
2633 if (strcmp (own_buf
, "OK") != 0)
2634 remove_tracepoint (tpoint
);
2648 cmd_qtdpsrc (char *own_buf
)
2650 ULONGEST num
, addr
, start
, slen
;
2651 struct tracepoint
*tpoint
;
2652 char *packet
= own_buf
;
2653 char *saved
, *srctype
, *src
;
2655 struct source_string
*last
, *newlast
;
2657 packet
+= strlen ("QTDPsrc:");
2659 packet
= unpack_varlen_hex (packet
, &num
);
2660 ++packet
; /* skip a colon */
2661 packet
= unpack_varlen_hex (packet
, &addr
);
2662 ++packet
; /* skip a colon */
2664 /* See if we already have this tracepoint. */
2665 tpoint
= find_tracepoint (num
, addr
);
2669 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2670 (int) num
, paddress (addr
));
2671 write_enn (own_buf
);
2676 packet
= strchr (packet
, ':');
2677 srctype
= xmalloc (packet
- saved
+ 1);
2678 memcpy (srctype
, saved
, packet
- saved
);
2679 srctype
[packet
- saved
] = '\0';
2681 packet
= unpack_varlen_hex (packet
, &start
);
2682 ++packet
; /* skip a colon */
2683 packet
= unpack_varlen_hex (packet
, &slen
);
2684 ++packet
; /* skip a colon */
2685 src
= xmalloc (slen
+ 1);
2686 nbytes
= unhexify (src
, packet
, strlen (packet
) / 2);
2689 newlast
= xmalloc (sizeof (struct source_string
));
2690 newlast
->type
= srctype
;
2692 newlast
->next
= NULL
;
2693 /* Always add a source string to the end of the list;
2694 this keeps sequences of actions/commands in the right
2696 if (tpoint
->source_strings
)
2698 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2700 last
->next
= newlast
;
2703 tpoint
->source_strings
= newlast
;
2709 cmd_qtdv (char *own_buf
)
2711 ULONGEST num
, val
, builtin
;
2714 struct trace_state_variable
*tsv
;
2715 char *packet
= own_buf
;
2717 packet
+= strlen ("QTDV:");
2719 packet
= unpack_varlen_hex (packet
, &num
);
2720 ++packet
; /* skip a colon */
2721 packet
= unpack_varlen_hex (packet
, &val
);
2722 ++packet
; /* skip a colon */
2723 packet
= unpack_varlen_hex (packet
, &builtin
);
2724 ++packet
; /* skip a colon */
2726 nbytes
= strlen (packet
) / 2;
2727 varname
= xmalloc (nbytes
+ 1);
2728 nbytes
= unhexify (varname
, packet
, nbytes
);
2729 varname
[nbytes
] = '\0';
2731 tsv
= create_trace_state_variable (num
, 1);
2732 tsv
->initial_value
= (LONGEST
) val
;
2733 tsv
->name
= varname
;
2735 set_trace_state_variable_value (num
, (LONGEST
) val
);
2741 cmd_qtenable_disable (char *own_buf
, int enable
)
2743 char *packet
= own_buf
;
2745 struct tracepoint
*tp
;
2747 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2748 packet
= unpack_varlen_hex (packet
, &num
);
2749 ++packet
; /* skip a colon */
2750 packet
= unpack_varlen_hex (packet
, &addr
);
2752 tp
= find_tracepoint (num
, addr
);
2756 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2758 trace_debug ("Tracepoint %d at 0x%s is already %s",
2759 (int) num
, paddress (addr
),
2760 enable
? "enabled" : "disabled");
2765 trace_debug ("%s tracepoint %d at 0x%s",
2766 enable
? "Enabling" : "Disabling",
2767 (int) num
, paddress (addr
));
2769 tp
->enabled
= enable
;
2771 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2774 int offset
= offsetof (struct tracepoint
, enabled
);
2775 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2777 ret
= prepare_to_access_memory ();
2780 trace_debug ("Failed to temporarily stop inferior threads");
2781 write_enn (own_buf
);
2785 ret
= write_inferior_integer (obj_addr
, enable
);
2786 done_accessing_memory ();
2790 trace_debug ("Cannot write enabled flag into "
2791 "inferior process memory");
2792 write_enn (own_buf
);
2801 trace_debug ("Tracepoint %d at 0x%s not found",
2802 (int) num
, paddress (addr
));
2803 write_enn (own_buf
);
2808 cmd_qtv (char *own_buf
)
2813 char *packet
= own_buf
;
2815 packet
+= strlen ("qTV:");
2816 unpack_varlen_hex (packet
, &num
);
2818 if (current_traceframe
>= 0)
2820 err
= traceframe_read_tsv ((int) num
, &val
);
2823 strcpy (own_buf
, "U");
2827 /* Only make tsv's be undefined before the first trace run. After a
2828 trace run is over, the user might want to see the last value of
2829 the tsv, and it might not be available in a traceframe. */
2830 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2832 strcpy (own_buf
, "U");
2836 val
= get_trace_state_variable_value (num
);
2838 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2841 /* Clear out the list of readonly regions. */
2844 clear_readonly_regions (void)
2846 struct readonly_region
*roreg
;
2848 while (readonly_regions
)
2850 roreg
= readonly_regions
;
2851 readonly_regions
= readonly_regions
->next
;
2856 /* Parse the collection of address ranges whose contents GDB believes
2857 to be unchanging and so can be read directly from target memory
2858 even while looking at a traceframe. */
2861 cmd_qtro (char *own_buf
)
2863 ULONGEST start
, end
;
2864 struct readonly_region
*roreg
;
2865 char *packet
= own_buf
;
2867 trace_debug ("Want to mark readonly regions");
2869 clear_readonly_regions ();
2871 packet
+= strlen ("QTro");
2873 while (*packet
== ':')
2875 ++packet
; /* skip a colon */
2876 packet
= unpack_varlen_hex (packet
, &start
);
2877 ++packet
; /* skip a comma */
2878 packet
= unpack_varlen_hex (packet
, &end
);
2879 roreg
= xmalloc (sizeof (struct readonly_region
));
2880 roreg
->start
= start
;
2882 roreg
->next
= readonly_regions
;
2883 readonly_regions
= roreg
;
2884 trace_debug ("Added readonly region from 0x%s to 0x%s",
2885 paddress (roreg
->start
), paddress (roreg
->end
));
2891 /* Test to see if the given range is in our list of readonly ranges.
2892 We only test for being entirely within a range, GDB is not going to
2893 send a single memory packet that spans multiple regions. */
2896 in_readonly_region (CORE_ADDR addr
, ULONGEST length
)
2898 struct readonly_region
*roreg
;
2900 for (roreg
= readonly_regions
; roreg
; roreg
= roreg
->next
)
2901 if (roreg
->start
<= addr
&& (addr
+ length
- 1) <= roreg
->end
)
2907 /* The maximum size of a jump pad entry. */
2908 static const int max_jump_pad_size
= 0x100;
2910 static CORE_ADDR gdb_jump_pad_head
;
2912 /* Return the address of the next free jump space. */
2915 get_jump_space_head (void)
2917 if (gdb_jump_pad_head
== 0)
2919 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2920 &gdb_jump_pad_head
))
2921 fatal ("error extracting jump_pad_buffer");
2924 return gdb_jump_pad_head
;
2927 /* Reserve USED bytes from the jump space. */
2930 claim_jump_space (ULONGEST used
)
2932 trace_debug ("claim_jump_space reserves %s bytes at %s",
2933 pulongest (used
), paddress (gdb_jump_pad_head
));
2934 gdb_jump_pad_head
+= used
;
2937 static CORE_ADDR trampoline_buffer_head
= 0;
2938 static CORE_ADDR trampoline_buffer_tail
;
2940 /* Reserve USED bytes from the trampoline buffer and return the
2941 address of the start of the reserved space in TRAMPOLINE. Returns
2942 non-zero if the space is successfully claimed. */
2945 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2947 if (!trampoline_buffer_head
)
2949 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2950 &trampoline_buffer_tail
))
2952 fatal ("error extracting trampoline_buffer");
2956 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2957 &trampoline_buffer_head
))
2959 fatal ("error extracting trampoline_buffer_end");
2964 /* Start claiming space from the top of the trampoline space. If
2965 the space is located at the bottom of the virtual address space,
2966 this reduces the possibility that corruption will occur if a null
2967 pointer is used to write to memory. */
2968 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2970 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2975 trampoline_buffer_head
-= used
;
2977 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2978 pulongest (used
), paddress (trampoline_buffer_head
));
2980 *trampoline
= trampoline_buffer_head
;
2984 /* Returns non-zero if there is space allocated for use in trampolines
2985 for fast tracepoints. */
2988 have_fast_tracepoint_trampoline_buffer (char *buf
)
2990 CORE_ADDR trampoline_end
, errbuf
;
2992 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2995 fatal ("error extracting trampoline_buffer_end");
3002 strcpy (buf
, "was claiming");
3003 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3006 fatal ("error extracting errbuf");
3010 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3013 return trampoline_end
!= 0;
3016 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3017 the command fails, or 0 otherwise. If the command ran
3018 successfully, but probing the marker failed, ERROUT will be filled
3019 with the error to reply to GDB, and -1 is also returned. This
3020 allows directly passing IPA errors to GDB. */
3023 probe_marker_at (CORE_ADDR address
, char *errout
)
3025 char cmd
[IPA_CMD_BUF_SIZE
];
3028 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3029 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3035 strcpy (errout
, cmd
);
3044 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3046 to
->jump_pad
= from
->jump_pad
;
3047 to
->jump_pad_end
= from
->jump_pad_end
;
3048 to
->trampoline
= from
->trampoline
;
3049 to
->trampoline_end
= from
->trampoline_end
;
3050 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3051 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3052 to
->handle
= from
->handle
;
3054 gdb_assert (from
->handle
);
3055 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3058 #define MAX_JUMP_SIZE 20
3060 /* Install fast tracepoint. Return 0 if successful, otherwise return
3064 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3066 CORE_ADDR jentry
, jump_entry
;
3067 CORE_ADDR trampoline
;
3068 ULONGEST trampoline_size
;
3070 /* The jump to the jump pad of the last fast tracepoint
3072 unsigned char fjump
[MAX_JUMP_SIZE
];
3073 ULONGEST fjump_size
;
3075 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3077 trace_debug ("Requested a fast tracepoint on an instruction "
3078 "that is of less than the minimum length.");
3082 jentry
= jump_entry
= get_jump_space_head ();
3085 trampoline_size
= 0;
3087 /* Install the jump pad. */
3088 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3090 ipa_sym_addrs
.addr_gdb_collect
,
3091 ipa_sym_addrs
.addr_collecting
,
3094 &trampoline
, &trampoline_size
,
3096 &tpoint
->adjusted_insn_addr
,
3097 &tpoint
->adjusted_insn_addr_end
,
3104 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3107 if (tpoint
->handle
!= NULL
)
3109 tpoint
->jump_pad
= jump_entry
;
3110 tpoint
->jump_pad_end
= jentry
;
3111 tpoint
->trampoline
= trampoline
;
3112 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3114 /* Pad to 8-byte alignment. */
3115 jentry
= ((jentry
+ 7) & ~0x7);
3116 claim_jump_space (jentry
- jump_entry
);
3123 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3126 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3128 tpoint
->handle
= NULL
;
3131 if (tpoint
->type
== trap_tracepoint
)
3133 /* Tracepoints are installed as memory breakpoints. Just go
3134 ahead and install the trap. The breakpoints module
3135 handles duplicated breakpoints, and the memory read
3136 routine handles un-patching traps from memory reads. */
3137 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3138 tracepoint_handler
);
3140 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3142 if (!agent_loaded_p ())
3144 trace_debug ("Requested a %s tracepoint, but fast "
3145 "tracepoints aren't supported.",
3146 tpoint
->type
== static_tracepoint
? "static" : "fast");
3147 write_e_ipa_not_loaded (own_buf
);
3150 if (tpoint
->type
== static_tracepoint
3151 && !in_process_agent_supports_ust ())
3153 trace_debug ("Requested a static tracepoint, but static "
3154 "tracepoints are not supported.");
3155 write_e_ust_not_loaded (own_buf
);
3159 if (tpoint
->type
== fast_tracepoint
)
3160 install_fast_tracepoint (tpoint
, own_buf
);
3163 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3164 tpoint
->handle
= (void *) -1;
3169 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3171 if (tpoint
->handle
== NULL
)
3173 if (*own_buf
== '\0')
3174 write_enn (own_buf
);
3180 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3183 cmd_qtstart (char *packet
)
3185 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3186 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3188 trace_debug ("Starting the trace");
3190 /* Pause all threads temporarily while we patch tracepoints. */
3193 /* Get threads out of jump pads. Safe to do here, since this is a
3194 top level command. And, required to do here, since we're
3195 deleting/rewriting jump pads. */
3197 stabilize_threads ();
3199 /* Freeze threads. */
3202 /* Sync the fast tracepoints list in the inferior ftlib. */
3203 if (agent_loaded_p ())
3204 download_trace_state_variables ();
3206 /* No previous fast tpoint yet. */
3207 prev_ftpoint
= NULL
;
3209 /* No previous static tpoint yet. */
3210 prev_stpoint
= NULL
;
3214 /* Start out empty. */
3215 if (agent_loaded_p ())
3216 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, 0);
3218 /* Download and install tracepoints. */
3219 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3221 /* Ensure all the hit counts start at zero. */
3222 tpoint
->hit_count
= 0;
3223 tpoint
->traceframe_usage
= 0;
3225 if (tpoint
->type
== trap_tracepoint
)
3227 /* Tracepoints are installed as memory breakpoints. Just go
3228 ahead and install the trap. The breakpoints module
3229 handles duplicated breakpoints, and the memory read
3230 routine handles un-patching traps from memory reads. */
3231 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3232 tracepoint_handler
);
3234 else if (tpoint
->type
== fast_tracepoint
3235 || tpoint
->type
== static_tracepoint
)
3237 if (maybe_write_ipa_not_loaded (packet
))
3239 trace_debug ("Requested a %s tracepoint, but fast "
3240 "tracepoints aren't supported.",
3241 tpoint
->type
== static_tracepoint
3242 ? "static" : "fast");
3246 if (tpoint
->type
== fast_tracepoint
)
3249 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3251 if (prev_ftpoint
!= NULL
3252 && prev_ftpoint
->address
== tpoint
->address
)
3255 tracepoint_send_agent (tpoint
);
3257 download_tracepoint_1 (tpoint
);
3259 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3263 /* Tracepoint is installed successfully? */
3266 /* Download and install fast tracepoint by agent. */
3268 installed
= !tracepoint_send_agent (tpoint
);
3271 download_tracepoint_1 (tpoint
);
3272 installed
= !install_fast_tracepoint (tpoint
, packet
);
3276 prev_ftpoint
= tpoint
;
3281 if (!in_process_agent_supports_ust ())
3283 trace_debug ("Requested a static tracepoint, but static "
3284 "tracepoints are not supported.");
3288 download_tracepoint_1 (tpoint
);
3289 /* Can only probe a given marker once. */
3290 if (prev_stpoint
!= NULL
3291 && prev_stpoint
->address
== tpoint
->address
)
3292 tpoint
->handle
= (void *) -1;
3295 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3297 tpoint
->handle
= (void *) -1;
3299 /* So that we can handle multiple static tracepoints
3300 at the same address easily. */
3301 prev_stpoint
= tpoint
;
3307 tpptr
= tpoint
->obj_addr_on_target
;
3309 if (tpoint
== tracepoints
)
3310 /* First object in list, set the head pointer in the
3312 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3314 write_inferior_data_ptr (prev_tpptr
+ offsetof (struct tracepoint
,
3319 /* Any failure in the inner loop is sufficient cause to give
3321 if (tpoint
->handle
== NULL
)
3325 /* Any error in tracepoint insertion is unacceptable; better to
3326 address the problem now, than end up with a useless or misleading
3330 clear_installed_tracepoints ();
3331 if (*packet
== '\0')
3337 stopping_tracepoint
= NULL
;
3338 trace_buffer_is_full
= 0;
3339 expr_eval_result
= expr_eval_no_error
;
3340 error_tracepoint
= NULL
;
3341 tracing_start_time
= get_timestamp ();
3343 /* Tracing is now active, hits will now start being logged. */
3346 if (agent_loaded_p ())
3348 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3349 fatal ("Error setting tracing variable in lib");
3351 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3353 fatal ("Error clearing stopping_tracepoint variable in lib");
3355 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3356 fatal ("Error clearing trace_buffer_is_full variable in lib");
3358 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3359 stop_tracing_handler
);
3360 if (stop_tracing_bkpt
== NULL
)
3361 error ("Error setting stop_tracing breakpoint");
3363 flush_trace_buffer_bkpt
3364 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3365 flush_trace_buffer_handler
);
3366 if (flush_trace_buffer_bkpt
== NULL
)
3367 error ("Error setting flush_trace_buffer breakpoint");
3375 /* End a tracing run, filling in a stop reason to report back to GDB,
3376 and removing the tracepoints from the code. */
3383 trace_debug ("Tracing is already off, ignoring");
3387 trace_debug ("Stopping the trace");
3389 /* Pause all threads before removing fast jumps from memory,
3390 breakpoints, and touching IPA state variables (inferior memory).
3391 Some thread may hit the internal tracing breakpoints, or be
3392 collecting this moment, but that's ok, we don't release the
3393 tpoint object's memory or the jump pads here (we only do that
3394 when we're sure we can move all threads out of the jump pads).
3395 We can't now, since we may be getting here due to the inferior
3396 agent calling us. */
3398 /* Since we're removing breakpoints, cancel breakpoint hits,
3399 possibly related to the breakpoints we're about to delete. */
3400 cancel_breakpoints ();
3402 /* Stop logging. Tracepoints can still be hit, but they will not be
3405 if (agent_loaded_p ())
3407 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3408 fatal ("Error clearing tracing variable in lib");
3411 tracing_stop_time
= get_timestamp ();
3412 tracing_stop_reason
= "t???";
3413 tracing_stop_tpnum
= 0;
3414 if (stopping_tracepoint
)
3416 trace_debug ("Stopping the trace because "
3417 "tracepoint %d was hit %" PRIu64
" times",
3418 stopping_tracepoint
->number
,
3419 stopping_tracepoint
->pass_count
);
3420 tracing_stop_reason
= "tpasscount";
3421 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3423 else if (trace_buffer_is_full
)
3425 trace_debug ("Stopping the trace because the trace buffer is full");
3426 tracing_stop_reason
= "tfull";
3428 else if (expr_eval_result
!= expr_eval_no_error
)
3430 trace_debug ("Stopping the trace because of an expression eval error");
3431 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3432 tracing_stop_tpnum
= error_tracepoint
->number
;
3434 #ifndef IN_PROCESS_AGENT
3435 else if (!gdb_connected ())
3437 trace_debug ("Stopping the trace because GDB disconnected");
3438 tracing_stop_reason
= "tdisconnected";
3443 trace_debug ("Stopping the trace because of a tstop command");
3444 tracing_stop_reason
= "tstop";
3447 stopping_tracepoint
= NULL
;
3448 error_tracepoint
= NULL
;
3450 /* Clear out the tracepoints. */
3451 clear_installed_tracepoints ();
3453 if (agent_loaded_p ())
3455 /* Pull in fast tracepoint trace frames from the inferior lib
3456 buffer into our buffer, even if our buffer is already full,
3457 because we want to present the full number of created frames
3458 in addition to what fit in the trace buffer. */
3459 upload_fast_traceframes ();
3462 if (stop_tracing_bkpt
!= NULL
)
3464 delete_breakpoint (stop_tracing_bkpt
);
3465 stop_tracing_bkpt
= NULL
;
3468 if (flush_trace_buffer_bkpt
!= NULL
)
3470 delete_breakpoint (flush_trace_buffer_bkpt
);
3471 flush_trace_buffer_bkpt
= NULL
;
3478 stop_tracing_handler (CORE_ADDR addr
)
3480 trace_debug ("lib hit stop_tracing");
3482 /* Don't actually handle it here. When we stop tracing we remove
3483 breakpoints from the inferior, and that is not allowed in a
3484 breakpoint handler (as the caller is walking the breakpoint
3490 flush_trace_buffer_handler (CORE_ADDR addr
)
3492 trace_debug ("lib hit flush_trace_buffer");
3497 cmd_qtstop (char *packet
)
3504 cmd_qtdisconnected (char *own_buf
)
3507 char *packet
= own_buf
;
3509 packet
+= strlen ("QTDisconnected:");
3511 unpack_varlen_hex (packet
, &setting
);
3515 disconnected_tracing
= setting
;
3519 cmd_qtframe (char *own_buf
)
3521 ULONGEST frame
, pc
, lo
, hi
, num
;
3523 struct traceframe
*tframe
;
3524 char *packet
= own_buf
;
3526 packet
+= strlen ("QTFrame:");
3528 if (strncmp (packet
, "pc:", strlen ("pc:")) == 0)
3530 packet
+= strlen ("pc:");
3531 unpack_varlen_hex (packet
, &pc
);
3532 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3533 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3535 else if (strncmp (packet
, "range:", strlen ("range:")) == 0)
3537 packet
+= strlen ("range:");
3538 packet
= unpack_varlen_hex (packet
, &lo
);
3540 unpack_varlen_hex (packet
, &hi
);
3541 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3542 paddress (lo
), paddress (hi
));
3543 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3545 else if (strncmp (packet
, "outside:", strlen ("outside:")) == 0)
3547 packet
+= strlen ("outside:");
3548 packet
= unpack_varlen_hex (packet
, &lo
);
3550 unpack_varlen_hex (packet
, &hi
);
3551 trace_debug ("Want to find next traceframe "
3552 "outside the range 0x%s to 0x%s",
3553 paddress (lo
), paddress (hi
));
3554 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3556 else if (strncmp (packet
, "tdp:", strlen ("tdp:")) == 0)
3558 packet
+= strlen ("tdp:");
3559 unpack_varlen_hex (packet
, &num
);
3561 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3562 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3566 unpack_varlen_hex (packet
, &frame
);
3567 tfnum
= (int) frame
;
3570 trace_debug ("Want to stop looking at traceframes");
3571 current_traceframe
= -1;
3575 trace_debug ("Want to look at traceframe %d", tfnum
);
3576 tframe
= find_traceframe (tfnum
);
3581 current_traceframe
= tfnum
;
3582 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3585 sprintf (own_buf
, "F-1");
3589 cmd_qtstatus (char *packet
)
3591 char *stop_reason_rsp
= NULL
;
3592 char *buf1
, *buf2
, *buf3
, *str
;
3595 /* Translate the plain text of the notes back into hex for
3598 str
= (tracing_user_name
? tracing_user_name
: "");
3599 slen
= strlen (str
);
3600 buf1
= (char *) alloca (slen
* 2 + 1);
3601 hexify (buf1
, str
, slen
);
3603 str
= (tracing_notes
? tracing_notes
: "");
3604 slen
= strlen (str
);
3605 buf2
= (char *) alloca (slen
* 2 + 1);
3606 hexify (buf2
, str
, slen
);
3608 str
= (tracing_stop_note
? tracing_stop_note
: "");
3609 slen
= strlen (str
);
3610 buf3
= (char *) alloca (slen
* 2 + 1);
3611 hexify (buf3
, str
, slen
);
3613 trace_debug ("Returning trace status as %d, stop reason %s",
3614 tracing
, tracing_stop_reason
);
3616 if (agent_loaded_p ())
3620 upload_fast_traceframes ();
3625 stop_reason_rsp
= (char *) tracing_stop_reason
;
3627 /* The user visible error string in terror needs to be hex encoded.
3628 We leave it as plain string in `tracing_stop_reason' to ease
3630 if (strncmp (stop_reason_rsp
, "terror:", strlen ("terror:")) == 0)
3632 const char *result_name
;
3636 result_name
= stop_reason_rsp
+ strlen ("terror:");
3637 hexstr_len
= strlen (result_name
) * 2;
3638 p
= stop_reason_rsp
= alloca (strlen ("terror:") + hexstr_len
+ 1);
3639 strcpy (p
, "terror:");
3641 convert_int_to_ascii ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3644 /* If this was a forced stop, include any stop note that was supplied. */
3645 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3647 stop_reason_rsp
= alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3648 strcpy (stop_reason_rsp
, "tstop:");
3649 strcat (stop_reason_rsp
, buf3
);
3655 "tframes:%x;tcreated:%x;"
3656 "tfree:%x;tsize:%s;"
3659 "starttime:%s;stoptime:%s;"
3660 "username:%s:;notes:%s:",
3662 stop_reason_rsp
, tracing_stop_tpnum
,
3663 traceframe_count
, traceframes_created
,
3664 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3665 circular_trace_buffer
,
3666 disconnected_tracing
,
3667 plongest (tracing_start_time
), plongest (tracing_stop_time
),
3672 cmd_qtp (char *own_buf
)
3675 struct tracepoint
*tpoint
;
3676 char *packet
= own_buf
;
3678 packet
+= strlen ("qTP:");
3680 packet
= unpack_varlen_hex (packet
, &num
);
3681 ++packet
; /* skip a colon */
3682 packet
= unpack_varlen_hex (packet
, &addr
);
3684 /* See if we already have this tracepoint. */
3685 tpoint
= find_tracepoint (num
, addr
);
3689 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3690 (int) num
, paddress (addr
));
3691 write_enn (own_buf
);
3695 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3696 tpoint
->traceframe_usage
);
3699 /* State variables to help return all the tracepoint bits. */
3700 static struct tracepoint
*cur_tpoint
;
3701 static int cur_action
;
3702 static int cur_step_action
;
3703 static struct source_string
*cur_source_string
;
3704 static struct trace_state_variable
*cur_tsv
;
3706 /* Compose a response that is an imitation of the syntax by which the
3707 tracepoint was originally downloaded. */
3710 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3714 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3715 paddress (tpoint
->address
),
3716 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3717 tpoint
->pass_count
);
3718 if (tpoint
->type
== fast_tracepoint
)
3719 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3720 else if (tpoint
->type
== static_tracepoint
)
3721 sprintf (packet
+ strlen (packet
), ":S");
3725 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3726 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3727 tpoint
->cond
->length
, buf
);
3732 /* Compose a response that is an imitation of the syntax by which the
3733 tracepoint action was originally downloaded (with the difference
3734 that due to the way we store the actions, this will output a packet
3735 per action, while GDB could have combined more than one action
3739 response_action (char *packet
, struct tracepoint
*tpoint
,
3740 char *taction
, int step
)
3742 sprintf (packet
, "%c%x:%s:%s",
3743 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3747 /* Compose a response that is an imitation of the syntax by which the
3748 tracepoint source piece was originally downloaded. */
3751 response_source (char *packet
,
3752 struct tracepoint
*tpoint
, struct source_string
*src
)
3757 len
= strlen (src
->str
);
3758 buf
= alloca (len
* 2 + 1);
3759 convert_int_to_ascii ((gdb_byte
*) src
->str
, buf
, len
);
3761 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3762 tpoint
->number
, paddress (tpoint
->address
),
3763 src
->type
, 0, len
, buf
);
3766 /* Return the first piece of tracepoint definition, and initialize the
3767 state machine that will iterate through all the tracepoint
3771 cmd_qtfp (char *packet
)
3773 trace_debug ("Returning first tracepoint definition piece");
3775 cur_tpoint
= tracepoints
;
3776 cur_action
= cur_step_action
= -1;
3777 cur_source_string
= NULL
;
3780 response_tracepoint (packet
, cur_tpoint
);
3782 strcpy (packet
, "l");
3785 /* Return additional pieces of tracepoint definition. Each action and
3786 stepping action must go into its own packet, because of packet size
3787 limits, and so we use state variables to deliver one piece at a
3791 cmd_qtsp (char *packet
)
3793 trace_debug ("Returning subsequent tracepoint definition piece");
3797 /* This case would normally never occur, but be prepared for
3799 strcpy (packet
, "l");
3801 else if (cur_action
< cur_tpoint
->numactions
- 1)
3804 response_action (packet
, cur_tpoint
,
3805 cur_tpoint
->actions_str
[cur_action
], 0);
3807 else if (cur_step_action
< cur_tpoint
->num_step_actions
- 1)
3810 response_action (packet
, cur_tpoint
,
3811 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3813 else if ((cur_source_string
3814 ? cur_source_string
->next
3815 : cur_tpoint
->source_strings
))
3817 if (cur_source_string
)
3818 cur_source_string
= cur_source_string
->next
;
3820 cur_source_string
= cur_tpoint
->source_strings
;
3821 response_source (packet
, cur_tpoint
, cur_source_string
);
3825 cur_tpoint
= cur_tpoint
->next
;
3826 cur_action
= cur_step_action
= -1;
3827 cur_source_string
= NULL
;
3829 response_tracepoint (packet
, cur_tpoint
);
3831 strcpy (packet
, "l");
3835 /* Compose a response that is an imitation of the syntax by which the
3836 trace state variable was originally downloaded. */
3839 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3841 char *buf
= (char *) "";
3846 namelen
= strlen (tsv
->name
);
3847 buf
= alloca (namelen
* 2 + 1);
3848 convert_int_to_ascii ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3851 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3852 tsv
->getter
? 1 : 0, buf
);
3855 /* Return the first trace state variable definition, and initialize
3856 the state machine that will iterate through all the tsv bits. */
3859 cmd_qtfv (char *packet
)
3861 trace_debug ("Returning first trace state variable definition");
3863 cur_tsv
= trace_state_variables
;
3866 response_tsv (packet
, cur_tsv
);
3868 strcpy (packet
, "l");
3871 /* Return additional trace state variable definitions. */
3874 cmd_qtsv (char *packet
)
3876 trace_debug ("Returning first trace state variable definition");
3880 /* This case would normally never occur, but be prepared for
3882 strcpy (packet
, "l");
3886 cur_tsv
= cur_tsv
->next
;
3888 response_tsv (packet
, cur_tsv
);
3890 strcpy (packet
, "l");
3893 strcpy (packet
, "l");
3896 /* Return the first static tracepoint marker, and initialize the state
3897 machine that will iterate through all the static tracepoints
3901 cmd_qtfstm (char *packet
)
3903 if (!maybe_write_ipa_ust_not_loaded (packet
))
3904 run_inferior_command (packet
, strlen (packet
) + 1);
3907 /* Return additional static tracepoints markers. */
3910 cmd_qtsstm (char *packet
)
3912 if (!maybe_write_ipa_ust_not_loaded (packet
))
3913 run_inferior_command (packet
, strlen (packet
) + 1);
3916 /* Return the definition of the static tracepoint at a given address.
3917 Result packet is the same as qTsST's. */
3920 cmd_qtstmat (char *packet
)
3922 if (!maybe_write_ipa_ust_not_loaded (packet
))
3923 run_inferior_command (packet
, strlen (packet
) + 1);
3926 /* Return the minimum instruction size needed for fast tracepoints as a
3927 hexadecimal number. */
3930 cmd_qtminftpilen (char *packet
)
3932 if (current_inferior
== NULL
)
3934 /* Indicate that the minimum length is currently unknown. */
3935 strcpy (packet
, "0");
3939 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
3942 /* Respond to qTBuffer packet with a block of raw data from the trace
3943 buffer. GDB may ask for a lot, but we are allowed to reply with
3944 only as much as will fit within packet limits or whatever. */
3947 cmd_qtbuffer (char *own_buf
)
3949 ULONGEST offset
, num
, tot
;
3951 char *packet
= own_buf
;
3953 packet
+= strlen ("qTBuffer:");
3955 packet
= unpack_varlen_hex (packet
, &offset
);
3956 ++packet
; /* skip a comma */
3957 unpack_varlen_hex (packet
, &num
);
3959 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
3960 (int) num
, pulongest (offset
));
3962 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
3964 /* If we're right at the end, reply specially that we're done. */
3967 strcpy (own_buf
, "l");
3971 /* Object to any other out-of-bounds request. */
3974 write_enn (own_buf
);
3978 /* Compute the pointer corresponding to the given offset, accounting
3980 tbp
= trace_buffer_start
+ offset
;
3981 if (tbp
>= trace_buffer_wrap
)
3982 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
3984 /* Trim to the remaining bytes if we're close to the end. */
3985 if (num
> tot
- offset
)
3988 /* Trim to available packet size. */
3989 if (num
>= (PBUFSIZ
- 16) / 2 )
3990 num
= (PBUFSIZ
- 16) / 2;
3992 convert_int_to_ascii (tbp
, own_buf
, num
);
3993 own_buf
[num
] = '\0';
3997 cmd_bigqtbuffer_circular (char *own_buf
)
4000 char *packet
= own_buf
;
4002 packet
+= strlen ("QTBuffer:circular:");
4004 unpack_varlen_hex (packet
, &val
);
4005 circular_trace_buffer
= val
;
4006 trace_debug ("Trace buffer is now %s",
4007 circular_trace_buffer
? "circular" : "linear");
4012 cmd_qtnotes (char *own_buf
)
4015 char *saved
, *user
, *notes
, *stopnote
;
4016 char *packet
= own_buf
;
4018 packet
+= strlen ("QTNotes:");
4022 if (strncmp ("user:", packet
, strlen ("user:")) == 0)
4024 packet
+= strlen ("user:");
4026 packet
= strchr (packet
, ';');
4027 nbytes
= (packet
- saved
) / 2;
4028 user
= xmalloc (nbytes
+ 1);
4029 nbytes
= unhexify (user
, saved
, nbytes
);
4030 user
[nbytes
] = '\0';
4031 ++packet
; /* skip the semicolon */
4032 trace_debug ("User is '%s'", user
);
4033 tracing_user_name
= user
;
4035 else if (strncmp ("notes:", packet
, strlen ("notes:")) == 0)
4037 packet
+= strlen ("notes:");
4039 packet
= strchr (packet
, ';');
4040 nbytes
= (packet
- saved
) / 2;
4041 notes
= xmalloc (nbytes
+ 1);
4042 nbytes
= unhexify (notes
, saved
, nbytes
);
4043 notes
[nbytes
] = '\0';
4044 ++packet
; /* skip the semicolon */
4045 trace_debug ("Notes is '%s'", notes
);
4046 tracing_notes
= notes
;
4048 else if (strncmp ("tstop:", packet
, strlen ("tstop:")) == 0)
4050 packet
+= strlen ("tstop:");
4052 packet
= strchr (packet
, ';');
4053 nbytes
= (packet
- saved
) / 2;
4054 stopnote
= xmalloc (nbytes
+ 1);
4055 nbytes
= unhexify (stopnote
, saved
, nbytes
);
4056 stopnote
[nbytes
] = '\0';
4057 ++packet
; /* skip the semicolon */
4058 trace_debug ("tstop note is '%s'", stopnote
);
4059 tracing_stop_note
= stopnote
;
4069 handle_tracepoint_general_set (char *packet
)
4071 if (strcmp ("QTinit", packet
) == 0)
4073 cmd_qtinit (packet
);
4076 else if (strncmp ("QTDP:", packet
, strlen ("QTDP:")) == 0)
4081 else if (strncmp ("QTDPsrc:", packet
, strlen ("QTDPsrc:")) == 0)
4083 cmd_qtdpsrc (packet
);
4086 else if (strncmp ("QTEnable:", packet
, strlen ("QTEnable:")) == 0)
4088 cmd_qtenable_disable (packet
, 1);
4091 else if (strncmp ("QTDisable:", packet
, strlen ("QTDisable:")) == 0)
4093 cmd_qtenable_disable (packet
, 0);
4096 else if (strncmp ("QTDV:", packet
, strlen ("QTDV:")) == 0)
4101 else if (strncmp ("QTro:", packet
, strlen ("QTro:")) == 0)
4106 else if (strcmp ("QTStart", packet
) == 0)
4108 cmd_qtstart (packet
);
4111 else if (strcmp ("QTStop", packet
) == 0)
4113 cmd_qtstop (packet
);
4116 else if (strncmp ("QTDisconnected:", packet
,
4117 strlen ("QTDisconnected:")) == 0)
4119 cmd_qtdisconnected (packet
);
4122 else if (strncmp ("QTFrame:", packet
, strlen ("QTFrame:")) == 0)
4124 cmd_qtframe (packet
);
4127 else if (strncmp ("QTBuffer:circular:", packet
, strlen ("QTBuffer:circular:")) == 0)
4129 cmd_bigqtbuffer_circular (packet
);
4132 else if (strncmp ("QTNotes:", packet
, strlen ("QTNotes:")) == 0)
4134 cmd_qtnotes (packet
);
4142 handle_tracepoint_query (char *packet
)
4144 if (strcmp ("qTStatus", packet
) == 0)
4146 cmd_qtstatus (packet
);
4149 else if (strncmp ("qTP:", packet
, strlen ("qTP:")) == 0)
4154 else if (strcmp ("qTfP", packet
) == 0)
4159 else if (strcmp ("qTsP", packet
) == 0)
4164 else if (strcmp ("qTfV", packet
) == 0)
4169 else if (strcmp ("qTsV", packet
) == 0)
4174 else if (strncmp ("qTV:", packet
, strlen ("qTV:")) == 0)
4179 else if (strncmp ("qTBuffer:", packet
, strlen ("qTBuffer:")) == 0)
4181 cmd_qtbuffer (packet
);
4184 else if (strcmp ("qTfSTM", packet
) == 0)
4186 cmd_qtfstm (packet
);
4189 else if (strcmp ("qTsSTM", packet
) == 0)
4191 cmd_qtsstm (packet
);
4194 else if (strncmp ("qTSTMat:", packet
, strlen ("qTSTMat:")) == 0)
4196 cmd_qtstmat (packet
);
4199 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4201 cmd_qtminftpilen (packet
);
4209 #ifndef IN_PROCESS_AGENT
4211 /* Call this when thread TINFO has hit the tracepoint defined by
4212 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4213 action. This adds a while-stepping collecting state item to the
4214 threads' collecting state list, so that we can keep track of
4215 multiple simultaneous while-stepping actions being collected by the
4216 same thread. This can happen in cases like:
4218 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4220 ff0003 INSN3 <-- TP2, collect $regs
4221 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4224 Notice that when instruction INSN5 is reached, the while-stepping
4225 actions of both TP1 and TP3 are still being collected, and that TP2
4226 had been collected meanwhile. The whole range of ff0001-ff0005
4227 should be single-stepped, due to at least TP1's while-stepping
4228 action covering the whole range. */
4231 add_while_stepping_state (struct thread_info
*tinfo
,
4232 int tp_number
, CORE_ADDR tp_address
)
4234 struct wstep_state
*wstep
;
4236 wstep
= xmalloc (sizeof (*wstep
));
4237 wstep
->next
= tinfo
->while_stepping
;
4239 wstep
->tp_number
= tp_number
;
4240 wstep
->tp_address
= tp_address
;
4241 wstep
->current_step
= 0;
4243 tinfo
->while_stepping
= wstep
;
4246 /* Release the while-stepping collecting state WSTEP. */
4249 release_while_stepping_state (struct wstep_state
*wstep
)
4254 /* Release all while-stepping collecting states currently associated
4255 with thread TINFO. */
4258 release_while_stepping_state_list (struct thread_info
*tinfo
)
4260 struct wstep_state
*head
;
4262 while (tinfo
->while_stepping
)
4264 head
= tinfo
->while_stepping
;
4265 tinfo
->while_stepping
= head
->next
;
4266 release_while_stepping_state (head
);
4270 /* If TINFO was handling a 'while-stepping' action, the step has
4271 finished, so collect any step data needed, and check if any more
4272 steps are required. Return true if the thread was indeed
4273 collecting tracepoint data, false otherwise. */
4276 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4278 struct tracepoint
*tpoint
;
4279 struct wstep_state
*wstep
;
4280 struct wstep_state
**wstep_link
;
4281 struct trap_tracepoint_ctx ctx
;
4283 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4285 if (agent_loaded_p ())
4286 upload_fast_traceframes ();
4288 /* Check if we were indeed collecting data for one of more
4289 tracepoints with a 'while-stepping' count. */
4290 if (tinfo
->while_stepping
== NULL
)
4295 /* We're not even tracing anymore. Stop this thread from
4297 release_while_stepping_state_list (tinfo
);
4299 /* The thread had stopped due to a single-step request indeed
4300 explained by a tracepoint. */
4304 wstep
= tinfo
->while_stepping
;
4305 wstep_link
= &tinfo
->while_stepping
;
4307 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4308 target_pid_to_str (tinfo
->entry
.id
),
4309 wstep
->tp_number
, paddress (wstep
->tp_address
));
4311 ctx
.base
.type
= trap_tracepoint
;
4312 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4314 while (wstep
!= NULL
)
4316 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4319 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4320 wstep
->tp_number
, paddress (wstep
->tp_address
),
4321 target_pid_to_str (tinfo
->entry
.id
));
4324 *wstep_link
= wstep
->next
;
4325 release_while_stepping_state (wstep
);
4326 wstep
= *wstep_link
;
4330 /* We've just finished one step. */
4331 ++wstep
->current_step
;
4334 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4335 stop_pc
, tpoint
, wstep
->current_step
);
4337 if (wstep
->current_step
>= tpoint
->step_count
)
4339 /* The requested numbers of steps have occurred. */
4340 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4341 target_pid_to_str (tinfo
->entry
.id
),
4342 wstep
->tp_number
, paddress (wstep
->tp_address
));
4344 /* Unlink the wstep. */
4345 *wstep_link
= wstep
->next
;
4346 release_while_stepping_state (wstep
);
4347 wstep
= *wstep_link
;
4349 /* Only check the hit count now, which ensure that we do all
4350 our stepping before stopping the run. */
4351 if (tpoint
->pass_count
> 0
4352 && tpoint
->hit_count
>= tpoint
->pass_count
4353 && stopping_tracepoint
== NULL
)
4354 stopping_tracepoint
= tpoint
;
4358 /* Keep single-stepping until the requested numbers of steps
4360 wstep_link
= &wstep
->next
;
4361 wstep
= *wstep_link
;
4364 if (stopping_tracepoint
4365 || trace_buffer_is_full
4366 || expr_eval_result
!= expr_eval_no_error
)
4376 /* Handle any internal tracing control breakpoint hits. That means,
4377 pull traceframes from the IPA to our buffer, and syncing both
4378 tracing agents when the IPA's tracing stops for some reason. */
4381 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4383 /* Pull in fast tracepoint trace frames from the inferior in-process
4384 agent's buffer into our buffer. */
4386 if (!agent_loaded_p ())
4389 upload_fast_traceframes ();
4391 /* Check if the in-process agent had decided we should stop
4393 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4395 int ipa_trace_buffer_is_full
;
4396 CORE_ADDR ipa_stopping_tracepoint
;
4397 int ipa_expr_eval_result
;
4398 CORE_ADDR ipa_error_tracepoint
;
4400 trace_debug ("lib stopped at stop_tracing");
4402 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4403 &ipa_trace_buffer_is_full
);
4405 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4406 &ipa_stopping_tracepoint
);
4407 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4409 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4410 &ipa_error_tracepoint
);
4411 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4413 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4414 &ipa_expr_eval_result
);
4415 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4417 trace_debug ("lib: trace_buffer_is_full: %d, "
4418 "stopping_tracepoint: %s, "
4419 "ipa_expr_eval_result: %d, "
4420 "error_tracepoint: %s, ",
4421 ipa_trace_buffer_is_full
,
4422 paddress (ipa_stopping_tracepoint
),
4423 ipa_expr_eval_result
,
4424 paddress (ipa_error_tracepoint
));
4428 if (ipa_trace_buffer_is_full
)
4429 trace_debug ("lib stopped due to full buffer.");
4430 if (ipa_stopping_tracepoint
)
4431 trace_debug ("lib stopped due to tpoint");
4432 if (ipa_stopping_tracepoint
)
4433 trace_debug ("lib stopped due to error");
4436 if (ipa_stopping_tracepoint
!= 0)
4439 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4441 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4443 expr_eval_result
= ipa_expr_eval_result
;
4445 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4450 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4452 trace_debug ("lib stopped at flush_trace_buffer");
4459 /* Return true if TINFO just hit a tracepoint. Collect data if
4463 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4465 struct tracepoint
*tpoint
;
4467 struct trap_tracepoint_ctx ctx
;
4469 /* Not tracing, don't handle. */
4473 ctx
.base
.type
= trap_tracepoint
;
4474 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4476 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4478 /* Note that we collect fast tracepoints here as well. We'll
4479 step over the fast tracepoint jump later, which avoids the
4480 double collect. However, we don't collect for static
4481 tracepoints here, because UST markers are compiled in program,
4482 and probes will be executed in program. So static tracepoints
4483 are collected there. */
4484 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4485 && tpoint
->type
!= static_tracepoint
)
4487 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4488 target_pid_to_str (tinfo
->entry
.id
),
4489 tpoint
->number
, paddress (tpoint
->address
));
4491 /* Test the condition if present, and collect if true. */
4493 || (condition_true_at_tracepoint
4494 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4495 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4498 if (stopping_tracepoint
4499 || trace_buffer_is_full
4500 || expr_eval_result
!= expr_eval_no_error
)
4504 /* If the tracepoint had a 'while-stepping' action, then set
4505 the thread to collect this tracepoint on the following
4507 else if (tpoint
->step_count
> 0)
4509 add_while_stepping_state (tinfo
,
4510 tpoint
->number
, tpoint
->address
);
4522 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4523 struct ust_marker_data
;
4524 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4525 struct traceframe
*tframe
);
4528 /* Create a trace frame for the hit of the given tracepoint in the
4532 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4533 struct tracepoint
*tpoint
)
4535 struct traceframe
*tframe
;
4538 /* Only count it as a hit when we actually collect data. */
4539 tpoint
->hit_count
++;
4541 /* If we've exceeded a defined pass count, record the event for
4542 later, and finish the collection for this hit. This test is only
4543 for nonstepping tracepoints, stepping tracepoints test at the end
4544 of their while-stepping loop. */
4545 if (tpoint
->pass_count
> 0
4546 && tpoint
->hit_count
>= tpoint
->pass_count
4547 && tpoint
->step_count
== 0
4548 && stopping_tracepoint
== NULL
)
4549 stopping_tracepoint
= tpoint
;
4551 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4552 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4554 tframe
= add_traceframe (tpoint
);
4558 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4560 #ifndef IN_PROCESS_AGENT
4561 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4562 tpoint
->number
, paddress (tpoint
->address
),
4563 tpoint
->actions_str
[acti
]);
4566 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4567 tpoint
->actions
[acti
]);
4570 finish_traceframe (tframe
);
4573 if (tframe
== NULL
&& tracing
)
4574 trace_buffer_is_full
= 1;
4577 #ifndef IN_PROCESS_AGENT
4580 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4582 struct tracepoint
*tpoint
, int current_step
)
4584 struct traceframe
*tframe
;
4587 trace_debug ("Making new step traceframe for "
4588 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4589 tpoint
->number
, paddress (tpoint
->address
),
4590 current_step
, tpoint
->step_count
,
4593 tframe
= add_traceframe (tpoint
);
4597 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4599 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4600 tpoint
->number
, paddress (tpoint
->address
),
4601 tpoint
->step_actions_str
[acti
]);
4603 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4604 tpoint
->step_actions
[acti
]);
4607 finish_traceframe (tframe
);
4610 if (tframe
== NULL
&& tracing
)
4611 trace_buffer_is_full
= 1;
4616 static struct regcache
*
4617 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4619 struct regcache
*regcache
= NULL
;
4621 #ifdef IN_PROCESS_AGENT
4622 if (ctx
->type
== fast_tracepoint
)
4624 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4625 if (!fctx
->regcache_initted
)
4627 fctx
->regcache_initted
= 1;
4628 init_register_cache (&fctx
->regcache
, fctx
->regspace
);
4629 supply_regblock (&fctx
->regcache
, NULL
);
4630 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4632 regcache
= &fctx
->regcache
;
4635 if (ctx
->type
== static_tracepoint
)
4637 struct static_tracepoint_ctx
*sctx
4638 = (struct static_tracepoint_ctx
*) ctx
;
4640 if (!sctx
->regcache_initted
)
4642 sctx
->regcache_initted
= 1;
4643 init_register_cache (&sctx
->regcache
, sctx
->regspace
);
4644 supply_regblock (&sctx
->regcache
, NULL
);
4645 /* Pass down the tracepoint address, because REGS doesn't
4646 include the PC, but we know what it must have been. */
4647 supply_static_tracepoint_registers (&sctx
->regcache
,
4648 (const unsigned char *)
4650 sctx
->tpoint
->address
);
4652 regcache
= &sctx
->regcache
;
4656 if (ctx
->type
== trap_tracepoint
)
4658 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4659 regcache
= tctx
->regcache
;
4663 gdb_assert (regcache
!= NULL
);
4669 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4671 struct tracepoint
*tpoint
,
4672 struct traceframe
*tframe
,
4673 struct tracepoint_action
*taction
)
4675 enum eval_result_type err
;
4677 switch (taction
->type
)
4681 struct collect_memory_action
*maction
;
4683 maction
= (struct collect_memory_action
*) taction
;
4685 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4686 pulongest (maction
->len
),
4687 paddress (maction
->addr
), maction
->basereg
);
4688 /* (should use basereg) */
4689 agent_mem_read (tframe
, NULL
,
4690 (CORE_ADDR
) maction
->addr
, maction
->len
);
4695 unsigned char *regspace
;
4696 struct regcache tregcache
;
4697 struct regcache
*context_regcache
;
4700 trace_debug ("Want to collect registers");
4702 /* Collect all registers for now. */
4703 regspace
= add_traceframe_block (tframe
,
4704 1 + register_cache_size ());
4705 if (regspace
== NULL
)
4707 trace_debug ("Trace buffer block allocation failed, skipping");
4710 /* Identify a register block. */
4713 context_regcache
= get_context_regcache (ctx
);
4715 /* Wrap the regblock in a register cache (in the stack, we
4716 don't want to malloc here). */
4717 init_register_cache (&tregcache
, regspace
+ 1);
4719 /* Copy the register data to the regblock. */
4720 regcache_cpy (&tregcache
, context_regcache
);
4722 #ifndef IN_PROCESS_AGENT
4723 /* On some platforms, trap-based tracepoints will have the PC
4724 pointing to the next instruction after the trap, but we
4725 don't want the user or GDB trying to guess whether the
4726 saved PC needs adjusting; so always record the adjusted
4727 stop_pc. Note that we can't use tpoint->address instead,
4728 since it will be wrong for while-stepping actions. This
4729 adjustment is a nop for fast tracepoints collected from the
4730 in-process lib (but not if GDBserver is collecting one
4731 preemptively), since the PC had already been adjusted to
4732 contain the tracepoint's address by the jump pad. */
4733 trace_debug ("Storing stop pc (0x%s) in regblock",
4734 paddress (stop_pc
));
4736 /* This changes the regblock, not the thread's
4738 regcache_write_pc (&tregcache
, stop_pc
);
4744 struct eval_expr_action
*eaction
;
4746 eaction
= (struct eval_expr_action
*) taction
;
4748 trace_debug ("Want to evaluate expression");
4750 err
= eval_tracepoint_agent_expr (ctx
, tframe
, eaction
->expr
, NULL
);
4752 if (err
!= expr_eval_no_error
)
4754 record_tracepoint_error (tpoint
, "action expression", err
);
4761 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4762 trace_debug ("Want to collect static trace data");
4763 collect_ust_data_at_tracepoint (ctx
, tframe
);
4765 trace_debug ("warning: collecting static trace data, "
4766 "but static tracepoints are not supported");
4771 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4777 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4778 struct tracepoint
*tpoint
)
4781 enum eval_result_type err
;
4783 /* Presently, gdbserver doesn't run compiled conditions, only the
4784 IPA does. If the program stops at a fast tracepoint's address
4785 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4786 gdbserver preemptively collect the fast tracepoint. Later, on
4787 resume, gdbserver steps over the fast tracepoint like it steps
4788 over breakpoints, so that the IPA doesn't see that fast
4789 tracepoint. This avoids double collects of fast tracepoints in
4790 that stopping scenario. Having gdbserver itself handle the fast
4791 tracepoint gives the user a consistent view of when fast or trap
4792 tracepoints are collected, compared to an alternative where only
4793 trap tracepoints are collected on stop, and fast tracepoints on
4794 resume. When a fast tracepoint is being processed by gdbserver,
4795 it is always the non-compiled condition expression that is
4797 #ifdef IN_PROCESS_AGENT
4798 if (tpoint
->compiled_cond
)
4799 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (ctx
, &value
);
4802 err
= eval_tracepoint_agent_expr (ctx
, NULL
, tpoint
->cond
, &value
);
4804 if (err
!= expr_eval_no_error
)
4806 record_tracepoint_error (tpoint
, "condition", err
);
4807 /* The error case must return false. */
4811 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4812 tpoint
->number
, paddress (tpoint
->address
),
4814 return (value
? 1 : 0);
4817 /* Evaluates a tracepoint agent expression with context CTX,
4818 traceframe TFRAME, agent expression AEXPR and store the
4821 static enum eval_result_type
4822 eval_tracepoint_agent_expr (struct tracepoint_hit_ctx
*ctx
,
4823 struct traceframe
*tframe
,
4824 struct agent_expr
*aexpr
,
4827 struct regcache
*regcache
;
4828 regcache
= get_context_regcache (ctx
);
4830 return gdb_eval_agent_expr (regcache
, tframe
, aexpr
, rslt
);
4833 /* Do memory copies for bytecodes. */
4834 /* Do the recording of memory blocks for actions and bytecodes. */
4837 agent_mem_read (struct traceframe
*tframe
,
4838 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4840 unsigned char *mspace
;
4841 ULONGEST remaining
= len
;
4842 unsigned short blocklen
;
4844 /* If a 'to' buffer is specified, use it. */
4847 read_inferior_memory (from
, to
, len
);
4851 /* Otherwise, create a new memory block in the trace buffer. */
4852 while (remaining
> 0)
4856 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4857 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4858 mspace
= add_traceframe_block (tframe
, sp
);
4861 /* Identify block as a memory block. */
4864 /* Record address and size. */
4865 memcpy (mspace
, &from
, sizeof (from
));
4866 mspace
+= sizeof (from
);
4867 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4868 mspace
+= sizeof (blocklen
);
4869 /* Record the memory block proper. */
4870 read_inferior_memory (from
, mspace
, blocklen
);
4871 trace_debug ("%d bytes recorded", blocklen
);
4872 remaining
-= blocklen
;
4879 agent_mem_read_string (struct traceframe
*tframe
,
4880 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4882 unsigned char *buf
, *mspace
;
4883 ULONGEST remaining
= len
;
4884 unsigned short blocklen
, i
;
4886 /* To save a bit of space, block lengths are 16-bit, so break large
4887 requests into multiple blocks. Bordering on overkill for strings,
4888 but it could happen that someone specifies a large max length. */
4889 while (remaining
> 0)
4893 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4894 /* We want working space to accumulate nonzero bytes, since
4895 traceframes must have a predecided size (otherwise it gets
4896 harder to wrap correctly for the circular case, etc). */
4897 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
4898 for (i
= 0; i
< blocklen
; ++i
)
4900 /* Read the string one byte at a time, in case the string is
4901 at the end of a valid memory area - we don't want a
4902 correctly-terminated string to engender segvio
4904 read_inferior_memory (from
+ i
, buf
+ i
, 1);
4909 /* Make sure outer loop stops now too. */
4910 remaining
= blocklen
;
4914 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4915 mspace
= add_traceframe_block (tframe
, sp
);
4921 /* Identify block as a memory block. */
4924 /* Record address and size. */
4925 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
4926 mspace
+= sizeof (from
);
4927 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
4928 mspace
+= sizeof (blocklen
);
4929 /* Copy the string contents. */
4930 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
4931 remaining
-= blocklen
;
4938 /* Record the value of a trace state variable. */
4941 agent_tsv_read (struct traceframe
*tframe
, int n
)
4943 unsigned char *vspace
;
4946 vspace
= add_traceframe_block (tframe
,
4947 1 + sizeof (n
) + sizeof (LONGEST
));
4950 /* Identify block as a variable. */
4952 /* Record variable's number and value. */
4953 memcpy (vspace
+ 1, &n
, sizeof (n
));
4954 val
= get_trace_state_variable_value (n
);
4955 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
4956 trace_debug ("Variable %d recorded", n
);
4960 #ifndef IN_PROCESS_AGENT
4962 /* Callback for traceframe_walk_blocks, used to find a given block
4963 type in a traceframe. */
4966 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
4968 char *wantedp
= data
;
4970 if (*wantedp
== blocktype
)
4976 /* Walk over all traceframe blocks of the traceframe buffer starting
4977 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
4978 block found, passing in DATA unmodified. If CALLBACK returns true,
4979 this returns a pointer to where the block is found. Returns NULL
4980 if no callback call returned true, indicating that all blocks have
4983 static unsigned char *
4984 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
4986 int (*callback
) (char blocktype
,
4987 unsigned char *dataptr
,
4991 unsigned char *dataptr
;
4995 trace_debug ("traceframe %d has no data", tfnum
);
4999 /* Iterate through a traceframe's blocks, looking for a block of the
5001 for (dataptr
= database
;
5002 dataptr
< database
+ datasize
;
5006 unsigned short mlen
;
5008 if (dataptr
== trace_buffer_wrap
)
5010 /* Adjust to reflect wrapping part of the frame around to
5012 datasize
= dataptr
- database
;
5013 dataptr
= database
= trace_buffer_lo
;
5016 blocktype
= *dataptr
++;
5018 if ((*callback
) (blocktype
, dataptr
, data
))
5024 /* Skip over the registers block. */
5025 dataptr
+= register_cache_size ();
5028 /* Skip over the memory block. */
5029 dataptr
+= sizeof (CORE_ADDR
);
5030 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5031 dataptr
+= (sizeof (mlen
) + mlen
);
5034 /* Skip over the TSV block. */
5035 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5038 /* Skip over the static trace data block. */
5039 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5040 dataptr
+= (sizeof (mlen
) + mlen
);
5043 trace_debug ("traceframe %d has unknown block type 0x%x",
5052 /* Look for the block of type TYPE_WANTED in the trameframe starting
5053 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5056 static unsigned char *
5057 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5058 int tfnum
, char type_wanted
)
5060 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5061 match_blocktype
, &type_wanted
);
5064 static unsigned char *
5065 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5067 unsigned char *regblock
;
5069 regblock
= traceframe_find_block_type (tframe
->data
,
5073 if (regblock
== NULL
)
5074 trace_debug ("traceframe %d has no register data", tfnum
);
5079 /* Get registers from a traceframe. */
5082 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5084 unsigned char *dataptr
;
5085 struct tracepoint
*tpoint
;
5086 struct traceframe
*tframe
;
5088 tframe
= find_traceframe (tfnum
);
5092 trace_debug ("traceframe %d not found", tfnum
);
5096 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5097 if (dataptr
== NULL
)
5099 /* Mark registers unavailable. */
5100 supply_regblock (regcache
, NULL
);
5102 /* We can generally guess at a PC, although this will be
5103 misleading for while-stepping frames and multi-location
5105 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5107 regcache_write_pc (regcache
, tpoint
->address
);
5110 supply_regblock (regcache
, dataptr
);
5116 traceframe_get_pc (struct traceframe
*tframe
)
5118 struct regcache regcache
;
5119 unsigned char *dataptr
;
5121 dataptr
= traceframe_find_regblock (tframe
, -1);
5122 if (dataptr
== NULL
)
5125 init_register_cache (®cache
, dataptr
);
5126 return regcache_read_pc (®cache
);
5129 /* Read a requested block of memory from a trace frame. */
5132 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5133 unsigned char *buf
, ULONGEST length
,
5136 struct traceframe
*tframe
;
5137 unsigned char *database
, *dataptr
;
5138 unsigned int datasize
;
5140 unsigned short mlen
;
5142 trace_debug ("traceframe_read_mem");
5144 tframe
= find_traceframe (tfnum
);
5148 trace_debug ("traceframe %d not found", tfnum
);
5152 datasize
= tframe
->data_size
;
5153 database
= dataptr
= &tframe
->data
[0];
5155 /* Iterate through a traceframe's blocks, looking for memory. */
5156 while ((dataptr
= traceframe_find_block_type (dataptr
,
5158 - (dataptr
- database
),
5159 tfnum
, 'M')) != NULL
)
5161 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5162 dataptr
+= sizeof (maddr
);
5163 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5164 dataptr
+= sizeof (mlen
);
5165 trace_debug ("traceframe %d has %d bytes at %s",
5166 tfnum
, mlen
, paddress (maddr
));
5168 /* If the block includes the first part of the desired range,
5169 return as much it has; GDB will re-request the remainder,
5170 which might be in a different block of this trace frame. */
5171 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5173 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5177 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5182 /* Skip over this block. */
5186 trace_debug ("traceframe %d has no memory data for the desired region",
5194 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5197 struct traceframe
*tframe
;
5198 unsigned char *database
, *dataptr
;
5199 unsigned int datasize
;
5202 trace_debug ("traceframe_read_tsv");
5204 tfnum
= current_traceframe
;
5208 trace_debug ("no current traceframe");
5212 tframe
= find_traceframe (tfnum
);
5216 trace_debug ("traceframe %d not found", tfnum
);
5220 datasize
= tframe
->data_size
;
5221 database
= dataptr
= &tframe
->data
[0];
5223 /* Iterate through a traceframe's blocks, looking for the tsv. */
5224 while ((dataptr
= traceframe_find_block_type (dataptr
,
5226 - (dataptr
- database
),
5227 tfnum
, 'V')) != NULL
)
5229 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5230 dataptr
+= sizeof (vnum
);
5232 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5234 /* Check that this is the variable we want. */
5237 memcpy (val
, dataptr
, sizeof (*val
));
5241 /* Skip over this block. */
5242 dataptr
+= sizeof (LONGEST
);
5245 trace_debug ("traceframe %d has no data for variable %d",
5250 /* Read a requested block of static tracepoint data from a trace
5254 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5255 unsigned char *buf
, ULONGEST length
,
5258 struct traceframe
*tframe
;
5259 unsigned char *database
, *dataptr
;
5260 unsigned int datasize
;
5261 unsigned short mlen
;
5263 trace_debug ("traceframe_read_sdata");
5265 tframe
= find_traceframe (tfnum
);
5269 trace_debug ("traceframe %d not found", tfnum
);
5273 datasize
= tframe
->data_size
;
5274 database
= &tframe
->data
[0];
5276 /* Iterate through a traceframe's blocks, looking for static
5278 dataptr
= traceframe_find_block_type (database
, datasize
,
5280 if (dataptr
!= NULL
)
5282 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5283 dataptr
+= sizeof (mlen
);
5286 if (offset
+ length
> mlen
)
5287 length
= mlen
- offset
;
5289 memcpy (buf
, dataptr
, length
);
5297 trace_debug ("traceframe %d has no static trace data", tfnum
);
5303 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5304 object. DATA is pointer to a struct buffer holding the
5305 traceframe-info object being built. */
5308 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5310 struct buffer
*buffer
= data
;
5316 unsigned short mlen
;
5319 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5320 dataptr
+= sizeof (maddr
);
5321 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5322 dataptr
+= sizeof (mlen
);
5323 buffer_xml_printf (buffer
,
5324 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5325 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5335 warning ("Unhandled trace block type (%d) '%c ' "
5336 "while building trace frame info.",
5337 blocktype
, blocktype
);
5344 /* Build a traceframe-info object for traceframe number TFNUM into
5348 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5350 struct traceframe
*tframe
;
5352 trace_debug ("traceframe_read_info");
5354 tframe
= find_traceframe (tfnum
);
5358 trace_debug ("traceframe %d not found", tfnum
);
5362 buffer_grow_str (buffer
, "<traceframe-info>\n");
5363 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5364 tfnum
, build_traceframe_info_xml
, buffer
);
5365 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5369 /* Return the first fast tracepoint whose jump pad contains PC. */
5371 static struct tracepoint
*
5372 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5374 struct tracepoint
*tpoint
;
5376 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5377 if (tpoint
->type
== fast_tracepoint
)
5378 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5384 /* Return the first fast tracepoint whose trampoline contains PC. */
5386 static struct tracepoint
*
5387 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5389 struct tracepoint
*tpoint
;
5391 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5393 if (tpoint
->type
== fast_tracepoint
5394 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5401 /* Return GDBserver's tracepoint that matches the IP Agent's
5402 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5405 static struct tracepoint
*
5406 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5408 struct tracepoint
*tpoint
;
5410 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5411 if (tpoint
->type
== fast_tracepoint
)
5412 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5420 /* The type of the object that is used to synchronize fast tracepoint
5423 typedef struct collecting_t
5425 /* The fast tracepoint number currently collecting. */
5428 /* A number that GDBserver can use to identify the thread that is
5429 presently holding the collect lock. This need not (and usually
5430 is not) the thread id, as getting the current thread ID usually
5431 requires a system call, which we want to avoid like the plague.
5432 Usually this is thread's TCB, found in the TLS (pseudo-)
5433 register, which is readable with a single insn on several
5435 uintptr_t thread_area
;
5438 #ifndef IN_PROCESS_AGENT
5441 force_unlock_trace_buffer (void)
5443 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5446 /* Check if the thread identified by THREAD_AREA which is stopped at
5447 STOP_PC, is presently locking the fast tracepoint collection, and
5448 if so, gather some status of said collection. Returns 0 if the
5449 thread isn't collecting or in the jump pad at all. 1, if in the
5450 jump pad (or within gdb_collect) and hasn't executed the adjusted
5451 original insn yet (can set a breakpoint there and run to it). 2,
5452 if presently executing the adjusted original insn --- in which
5453 case, if we want to move the thread out of the jump pad, we need to
5454 single-step it until this function returns 0. */
5457 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5459 struct fast_tpoint_collect_status
*status
)
5461 CORE_ADDR ipa_collecting
;
5462 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5463 CORE_ADDR ipa_gdb_trampoline_buffer
;
5464 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5465 struct tracepoint
*tpoint
;
5466 int needs_breakpoint
;
5468 /* The thread THREAD_AREA is either:
5470 0. not collecting at all, not within the jump pad, or within
5471 gdb_collect or one of its callees.
5473 1. in the jump pad and haven't reached gdb_collect
5475 2. within gdb_collect (out of the jump pad) (collect is set)
5477 3. we're in the jump pad, after gdb_collect having returned,
5478 possibly executing the adjusted insns.
5480 For cases 1 and 3, `collecting' may or not be set. The jump pad
5481 doesn't have any complicated jump logic, so we can tell if the
5482 thread is executing the adjust original insn or not by just
5483 matching STOP_PC with known jump pad addresses. If we it isn't
5484 yet executing the original insn, set a breakpoint there, and let
5485 the thread run to it, so to quickly step over a possible (many
5486 insns) gdb_collect call. Otherwise, or when the breakpoint is
5487 hit, only a few (small number of) insns are left to be executed
5488 in the jump pad. Single-step the thread until it leaves the
5493 needs_breakpoint
= 0;
5494 trace_debug ("fast_tracepoint_collecting");
5496 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5497 &ipa_gdb_jump_pad_buffer
))
5498 fatal ("error extracting `gdb_jump_pad_buffer'");
5499 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5500 &ipa_gdb_jump_pad_buffer_end
))
5501 fatal ("error extracting `gdb_jump_pad_buffer_end'");
5503 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5504 &ipa_gdb_trampoline_buffer
))
5505 fatal ("error extracting `gdb_trampoline_buffer'");
5506 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5507 &ipa_gdb_trampoline_buffer_end
))
5508 fatal ("error extracting `gdb_trampoline_buffer_end'");
5510 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5511 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5513 /* We can tell which tracepoint(s) the thread is collecting by
5514 matching the jump pad address back to the tracepoint. */
5515 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5518 warning ("in jump pad, but no matching tpoint?");
5523 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5525 tpoint
->number
, paddress (tpoint
->address
),
5526 paddress (tpoint
->jump_pad
),
5527 paddress (tpoint
->jump_pad_end
),
5528 paddress (tpoint
->adjusted_insn_addr
),
5529 paddress (tpoint
->adjusted_insn_addr_end
));
5532 /* Definitely in the jump pad. May or may not need
5533 fast-exit-jump-pad breakpoint. */
5534 if (tpoint
->jump_pad
<= stop_pc
5535 && stop_pc
< tpoint
->adjusted_insn_addr
)
5536 needs_breakpoint
= 1;
5538 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5539 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5541 /* We can tell which tracepoint(s) the thread is collecting by
5542 matching the trampoline address back to the tracepoint. */
5543 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5546 warning ("in trampoline, but no matching tpoint?");
5551 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5552 tpoint
->number
, paddress (tpoint
->address
),
5553 paddress (tpoint
->trampoline
),
5554 paddress (tpoint
->trampoline_end
));
5557 /* Have not reached jump pad yet, but treat the trampoline as a
5558 part of the jump pad that is before the adjusted original
5560 needs_breakpoint
= 1;
5564 collecting_t ipa_collecting_obj
;
5566 /* If `collecting' is set/locked, then the THREAD_AREA thread
5567 may or not be the one holding the lock. We have to read the
5568 lock to find out. */
5570 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5573 trace_debug ("fast_tracepoint_collecting:"
5574 " failed reading 'collecting' in the inferior");
5578 if (!ipa_collecting
)
5580 trace_debug ("fast_tracepoint_collecting: not collecting"
5581 " (and nobody is).");
5585 /* Some thread is collecting. Check which. */
5586 if (read_inferior_memory (ipa_collecting
,
5587 (unsigned char *) &ipa_collecting_obj
,
5588 sizeof (ipa_collecting_obj
)) != 0)
5591 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5593 trace_debug ("fast_tracepoint_collecting: not collecting "
5594 "(another thread is)");
5599 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5602 warning ("fast_tracepoint_collecting: collecting, "
5603 "but tpoint %s not found?",
5604 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5608 /* The thread is within `gdb_collect', skip over the rest of
5609 fast tracepoint collection quickly using a breakpoint. */
5610 needs_breakpoint
= 1;
5613 /* The caller wants a bit of status detail. */
5616 status
->tpoint_num
= tpoint
->number
;
5617 status
->tpoint_addr
= tpoint
->address
;
5618 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5619 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5622 if (needs_breakpoint
)
5624 /* Hasn't executed the original instruction yet. Set breakpoint
5625 there, and wait till it's hit, then single-step until exiting
5629 fast_tracepoint_collecting, returning continue-until-break at %s",
5630 paddress (tpoint
->adjusted_insn_addr
));
5632 return 1; /* continue */
5636 /* Just single-step until exiting the jump pad. */
5638 trace_debug ("fast_tracepoint_collecting, returning "
5639 "need-single-step (%s-%s)",
5640 paddress (tpoint
->adjusted_insn_addr
),
5641 paddress (tpoint
->adjusted_insn_addr_end
));
5643 return 2; /* single-step */
5649 #ifdef IN_PROCESS_AGENT
5651 /* The global fast tracepoint collect lock. Points to a collecting_t
5652 object built on the stack by the jump pad, if presently locked;
5653 NULL if it isn't locked. Note that this lock *must* be set while
5654 executing any *function other than the jump pad. See
5655 fast_tracepoint_collecting. */
5656 static collecting_t
* ATTR_USED collecting
;
5658 /* This routine, called from the jump pad (in asm) is designed to be
5659 called from the jump pads of fast tracepoints, thus it is on the
5662 IP_AGENT_EXPORT
void ATTR_USED
5663 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5665 struct fast_tracepoint_ctx ctx
;
5667 /* Don't do anything until the trace run is completely set up. */
5671 ctx
.base
.type
= fast_tracepoint
;
5673 ctx
.regcache_initted
= 0;
5674 /* Wrap the regblock in a register cache (in the stack, we don't
5675 want to malloc here). */
5676 ctx
.regspace
= alloca (register_cache_size ());
5677 if (ctx
.regspace
== NULL
)
5679 trace_debug ("Trace buffer block allocation failed, skipping");
5683 for (ctx
.tpoint
= tpoint
;
5684 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5685 ctx
.tpoint
= ctx
.tpoint
->next
)
5687 if (!ctx
.tpoint
->enabled
)
5690 /* Multiple tracepoints of different types, such as fast tracepoint and
5691 static tracepoint, can be set at the same address. */
5692 if (ctx
.tpoint
->type
!= tpoint
->type
)
5695 /* Test the condition if present, and collect if true. */
5696 if (ctx
.tpoint
->cond
== NULL
5697 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5700 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5701 ctx
.tpoint
->address
, ctx
.tpoint
);
5703 /* Note that this will cause original insns to be written back
5704 to where we jumped from, but that's OK because we're jumping
5705 back to the next whole instruction. This will go badly if
5706 instruction restoration is not atomic though. */
5707 if (stopping_tracepoint
5708 || trace_buffer_is_full
5709 || expr_eval_result
!= expr_eval_no_error
)
5717 /* If there was a condition and it evaluated to false, the only
5718 way we would stop tracing is if there was an error during
5719 condition expression evaluation. */
5720 if (expr_eval_result
!= expr_eval_no_error
)
5731 #ifndef IN_PROCESS_AGENT
5734 get_raw_reg_func_addr (void)
5736 return ipa_sym_addrs
.addr_get_raw_reg
;
5740 get_get_tsv_func_addr (void)
5742 return ipa_sym_addrs
.addr_get_trace_state_variable_value
;
5746 get_set_tsv_func_addr (void)
5748 return ipa_sym_addrs
.addr_set_trace_state_variable_value
;
5752 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5753 CORE_ADDR
*jump_entry
)
5755 CORE_ADDR entry_point
= *jump_entry
;
5756 enum eval_result_type err
;
5758 trace_debug ("Starting condition compilation for tracepoint %d\n",
5761 /* Initialize the global pointer to the code being built. */
5762 current_insn_ptr
= *jump_entry
;
5766 err
= compile_bytecodes (tpoint
->cond
);
5768 if (err
== expr_eval_no_error
)
5772 /* Record the beginning of the compiled code. */
5773 tpoint
->compiled_cond
= entry_point
;
5775 trace_debug ("Condition compilation for tracepoint %d complete\n",
5780 /* Leave the unfinished code in situ, but don't point to it. */
5782 tpoint
->compiled_cond
= 0;
5784 trace_debug ("Condition compilation for tracepoint %d failed, "
5786 tpoint
->number
, err
);
5789 /* Update the code pointer passed in. Note that we do this even if
5790 the compile fails, so that we can look at the partial results
5791 instead of letting them be overwritten. */
5792 *jump_entry
= current_insn_ptr
;
5794 /* Leave a gap, to aid dump decipherment. */
5798 /* We'll need to adjust these when we consider bi-arch setups, and big
5802 write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
)
5804 return write_inferior_memory (where
,
5805 (unsigned char *) &ptr
, sizeof (void *));
5808 /* The base pointer of the IPA's heap. This is the only memory the
5809 IPA is allowed to use. The IPA should _not_ call the inferior's
5810 `malloc' during operation. That'd be slow, and, most importantly,
5811 it may not be safe. We may be collecting a tracepoint in a signal
5812 handler, for example. */
5813 static CORE_ADDR target_tp_heap
;
5815 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5819 target_malloc (ULONGEST size
)
5823 if (target_tp_heap
== 0)
5825 /* We have the pointer *address*, need what it points to. */
5826 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5828 fatal ("could get target heap head pointer");
5831 ptr
= target_tp_heap
;
5832 target_tp_heap
+= size
;
5834 /* Pad to 8-byte alignment. */
5835 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
5841 download_agent_expr (struct agent_expr
*expr
)
5843 CORE_ADDR expr_addr
;
5844 CORE_ADDR expr_bytes
;
5846 expr_addr
= target_malloc (sizeof (*expr
));
5847 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
5849 expr_bytes
= target_malloc (expr
->length
);
5850 write_inferior_data_ptr (expr_addr
+ offsetof (struct agent_expr
, bytes
),
5852 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
5857 /* Align V up to N bits. */
5858 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5860 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5863 download_tracepoint_1 (struct tracepoint
*tpoint
)
5865 struct tracepoint target_tracepoint
;
5866 CORE_ADDR tpptr
= 0;
5868 gdb_assert (tpoint
->type
== fast_tracepoint
5869 || tpoint
->type
== static_tracepoint
);
5871 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
5873 CORE_ADDR jentry
, jump_entry
;
5875 jentry
= jump_entry
= get_jump_space_head ();
5877 if (tpoint
->cond
!= NULL
)
5879 /* Pad to 8-byte alignment. (needed?) */
5880 /* Actually this should be left for the target to
5882 jentry
= UALIGN (jentry
, 8);
5884 compile_tracepoint_condition (tpoint
, &jentry
);
5887 /* Pad to 8-byte alignment. */
5888 jentry
= UALIGN (jentry
, 8);
5889 claim_jump_space (jentry
- jump_entry
);
5892 target_tracepoint
= *tpoint
;
5894 tpptr
= target_malloc (sizeof (*tpoint
));
5895 tpoint
->obj_addr_on_target
= tpptr
;
5897 /* Write the whole object. We'll fix up its pointers in a bit.
5898 Assume no next for now. This is fixed up above on the next
5899 iteration, if there's any. */
5900 target_tracepoint
.next
= NULL
;
5901 /* Need to clear this here too, since we're downloading the
5902 tracepoints before clearing our own copy. */
5903 target_tracepoint
.hit_count
= 0;
5905 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
5906 sizeof (target_tracepoint
));
5909 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5911 download_agent_expr (tpoint
->cond
));
5913 if (tpoint
->numactions
)
5916 CORE_ADDR actions_array
;
5918 /* The pointers array. */
5920 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
5921 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5925 /* Now for each pointer, download the action. */
5926 for (i
= 0; i
< tpoint
->numactions
; i
++)
5928 struct tracepoint_action
*action
= tpoint
->actions
[i
];
5929 CORE_ADDR ipa_action
= action
->ops
->download (action
);
5931 if (ipa_action
!= 0)
5932 write_inferior_data_ptr
5933 (actions_array
+ i
* sizeof (sizeof (*tpoint
->actions
)),
5939 #define IPA_PROTO_FAST_TRACE_FLAG 0
5940 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
5941 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
5942 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
5943 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
5945 /* Send a command to agent to download and install tracepoint TPOINT. */
5948 tracepoint_send_agent (struct tracepoint
*tpoint
)
5950 char buf
[IPA_CMD_BUF_SIZE
];
5955 strcpy (p
, "FastTrace:");
5958 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
5959 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
5960 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
5961 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
5962 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
5963 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
5964 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
5965 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
5966 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
5967 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
5968 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
5971 p
= agent_expr_send (p
, tpoint
->cond
);
5973 /* tracepoint_action */
5974 for (i
= 0; i
< tpoint
->numactions
; i
++)
5976 struct tracepoint_action
*action
= tpoint
->actions
[i
];
5978 p
[0] = action
->type
;
5979 p
= action
->ops
->send (&p
[1], action
);
5982 get_jump_space_head ();
5983 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
5984 agent can use jump pad from it. */
5985 if (tpoint
->type
== fast_tracepoint
)
5987 memcpy (p
, &gdb_jump_pad_head
, 8);
5991 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
5995 if (strncmp (buf
, "OK", 2) != 0)
5998 /* The value of tracepoint's target address is stored in BUF. */
5999 memcpy (&tpoint
->obj_addr_on_target
,
6000 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6002 if (tpoint
->type
== fast_tracepoint
)
6005 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6008 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6009 (unsigned int) tpoint
->obj_addr_on_target
,
6010 (unsigned int) gdb_jump_pad_head
);
6012 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6014 /* This has been done in agent. We should also set up record for it. */
6015 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6018 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6025 download_tracepoint (struct tracepoint
*tpoint
)
6027 struct tracepoint
*tp
, *tp_prev
;
6029 if (tpoint
->type
!= fast_tracepoint
6030 && tpoint
->type
!= static_tracepoint
)
6033 download_tracepoint_1 (tpoint
);
6035 /* Find the previous entry of TPOINT, which is fast tracepoint or
6036 static tracepoint. */
6038 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6040 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6046 CORE_ADDR tp_prev_target_next_addr
;
6048 /* Insert TPOINT after TP_PREV in IPA. */
6049 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6050 + offsetof (struct tracepoint
, next
),
6051 &tp_prev_target_next_addr
))
6052 fatal ("error reading `tp_prev->next'");
6054 /* tpoint->next = tp_prev->next */
6055 write_inferior_data_ptr (tpoint
->obj_addr_on_target
6056 + offsetof (struct tracepoint
, next
),
6057 tp_prev_target_next_addr
);
6058 /* tp_prev->next = tpoint */
6059 write_inferior_data_ptr (tp_prev
->obj_addr_on_target
6060 + offsetof (struct tracepoint
, next
),
6061 tpoint
->obj_addr_on_target
);
6064 /* First object in list, set the head pointer in the
6066 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
,
6067 tpoint
->obj_addr_on_target
);
6072 download_trace_state_variables (void)
6074 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6075 struct trace_state_variable
*tsv
;
6077 /* Start out empty. */
6078 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6080 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6082 struct trace_state_variable target_tsv
;
6084 /* TSV's with a getter have been initialized equally in both the
6085 inferior and GDBserver. Skip them. */
6086 if (tsv
->getter
!= NULL
)
6092 ptr
= target_malloc (sizeof (*tsv
));
6094 if (tsv
== trace_state_variables
)
6096 /* First object in list, set the head pointer in the
6099 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
,
6104 write_inferior_data_ptr (prev_ptr
6105 + offsetof (struct trace_state_variable
,
6110 /* Write the whole object. We'll fix up its pointers in a bit.
6111 Assume no next, fixup when needed. */
6112 target_tsv
.next
= NULL
;
6114 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6115 sizeof (target_tsv
));
6117 if (tsv
->name
!= NULL
)
6119 size_t size
= strlen (tsv
->name
) + 1;
6120 CORE_ADDR name_addr
= target_malloc (size
);
6121 write_inferior_memory (name_addr
,
6122 (unsigned char *) tsv
->name
, size
);
6123 write_inferior_data_ptr (ptr
6124 + offsetof (struct trace_state_variable
,
6129 if (tsv
->getter
!= NULL
)
6131 fatal ("what to do with these?");
6137 /* Fixup the next pointer in the last item in the list. */
6138 write_inferior_data_ptr (prev_ptr
6139 + offsetof (struct trace_state_variable
,
6144 /* Upload complete trace frames out of the IP Agent's trace buffer
6145 into GDBserver's trace buffer. This always uploads either all or
6146 no trace frames. This is the counter part of
6147 `trace_alloc_trace_buffer'. See its description of the atomic
6148 synching mechanism. */
6151 upload_fast_traceframes (void)
6153 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6154 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6156 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6157 unsigned int curr_tbctrl_idx
;
6158 unsigned int ipa_trace_buffer_ctrl_curr
;
6159 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6160 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6161 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6162 CORE_ADDR ipa_trace_buffer_lo
;
6163 CORE_ADDR ipa_trace_buffer_hi
;
6165 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6166 &ipa_traceframe_read_count_racy
))
6168 /* This will happen in most targets if the current thread is
6173 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6174 &ipa_traceframe_write_count_racy
))
6177 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6178 ipa_traceframe_write_count_racy
6179 - ipa_traceframe_read_count_racy
,
6180 ipa_traceframe_write_count_racy
,
6181 ipa_traceframe_read_count_racy
);
6183 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6186 about_to_request_buffer_space_bkpt
6187 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6190 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6191 &ipa_trace_buffer_ctrl_curr
))
6194 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6196 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6199 unsigned int prev
, counter
;
6201 /* Update the token, with new counters, and the GDBserver stamp
6202 bit. Alway reuse the current TBC index. */
6203 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6204 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6206 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6212 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6213 ipa_trace_buffer_ctrl_curr
))
6216 trace_debug ("Lib: Committed %08x -> %08x",
6217 ipa_trace_buffer_ctrl_curr_old
,
6218 ipa_trace_buffer_ctrl_curr
);
6220 /* Re-read these, now that we've installed the
6221 `about_to_request_buffer_space' breakpoint/lock. A thread could
6222 have finished a traceframe between the last read of these
6223 counters and setting the breakpoint above. If we start
6224 uploading, we never want to leave this function with
6225 traceframe_read_count != 0, otherwise, GDBserver could end up
6226 incrementing the counter tokens more than once (due to event loop
6227 nesting), which would break the IP agent's "effective" detection
6228 (see trace_alloc_trace_buffer). */
6229 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6230 &ipa_traceframe_read_count
))
6232 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6233 &ipa_traceframe_write_count
))
6238 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6239 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6240 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6242 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6243 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6244 trace_debug ("note that ipa_traceframe_count's parts changed");
6247 /* Get the address of the current TBC object (the IP agent has an
6248 array of 3 such objects). The index is stored in the TBC
6250 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6251 ipa_trace_buffer_ctrl_addr
6252 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6254 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6255 (unsigned char *) &ipa_trace_buffer_ctrl
,
6256 sizeof (struct ipa_trace_buffer_control
)))
6259 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6260 &ipa_trace_buffer_lo
))
6262 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6263 &ipa_trace_buffer_hi
))
6266 /* Offsets are easier to grok for debugging than raw addresses,
6267 especially for the small trace buffer sizes that are useful for
6269 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6270 "endfree=%d wrap=%d hi=%d",
6272 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6273 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6274 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6275 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6276 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6278 /* Note that the IPA's buffer is always circular. */
6280 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6282 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6283 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6285 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6286 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6287 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6288 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6291 tf
= IPA_FIRST_TRACEFRAME ();
6293 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6295 struct tracepoint
*tpoint
;
6296 struct traceframe
*tframe
;
6297 unsigned char *block
;
6298 struct traceframe ipa_tframe
;
6300 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6301 offsetof (struct traceframe
, data
)))
6302 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6304 if (ipa_tframe
.tpnum
== 0)
6305 fatal ("Uploading: No (more) fast traceframes, but "
6306 "ipa_traceframe_count == %u??\n",
6307 ipa_traceframe_write_count
- ipa_traceframe_read_count
);
6309 /* Note that this will be incorrect for multi-location
6311 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6313 tframe
= add_traceframe (tpoint
);
6316 trace_buffer_is_full
= 1;
6317 trace_debug ("Uploading: trace buffer is full");
6321 /* Copy the whole set of blocks in one go for now. FIXME:
6322 split this in smaller blocks. */
6323 block
= add_traceframe_block (tframe
, ipa_tframe
.data_size
);
6326 if (read_inferior_memory (tf
6327 + offsetof (struct traceframe
, data
),
6328 block
, ipa_tframe
.data_size
))
6329 error ("Uploading: Couldn't read traceframe data at %s\n",
6330 paddress (tf
+ offsetof (struct traceframe
, data
)));
6333 trace_debug ("Uploading: traceframe didn't fit");
6334 finish_traceframe (tframe
);
6337 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6339 /* If we freed the traceframe that wrapped around, go back
6340 to the non-wrap case. */
6341 if (tf
< ipa_trace_buffer_ctrl
.start
)
6343 trace_debug ("Lib: Discarding past the wraparound");
6344 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6346 ipa_trace_buffer_ctrl
.start
= tf
;
6347 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6348 ++ipa_traceframe_read_count
;
6350 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6351 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6353 trace_debug ("Lib: buffer is fully empty. "
6354 "Trace buffer [%d] start=%d free=%d endfree=%d",
6356 (int) (ipa_trace_buffer_ctrl
.start
6357 - ipa_trace_buffer_lo
),
6358 (int) (ipa_trace_buffer_ctrl
.free
6359 - ipa_trace_buffer_lo
),
6360 (int) (ipa_trace_buffer_ctrl
.end_free
6361 - ipa_trace_buffer_lo
));
6363 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6364 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6365 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6366 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6369 trace_debug ("Uploaded a traceframe\n"
6370 "Lib: Trace buffer [%d] start=%d free=%d "
6371 "endfree=%d wrap=%d hi=%d",
6373 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6374 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6375 (int) (ipa_trace_buffer_ctrl
.end_free
6376 - ipa_trace_buffer_lo
),
6377 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6378 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6381 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6382 (unsigned char *) &ipa_trace_buffer_ctrl
,
6383 sizeof (struct ipa_trace_buffer_control
)))
6386 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6387 ipa_traceframe_read_count
);
6389 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6392 cancel_breakpoints ();
6394 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6395 about_to_request_buffer_space_bkpt
= NULL
;
6399 if (trace_buffer_is_full
)
6404 #ifdef IN_PROCESS_AGENT
6406 IP_AGENT_EXPORT
int ust_loaded
;
6407 IP_AGENT_EXPORT
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6411 /* Static tracepoints. */
6413 /* UST puts a "struct tracepoint" in the global namespace, which
6414 conflicts with our tracepoint. Arguably, being a library, it
6415 shouldn't take ownership of such a generic name. We work around it
6417 #define tracepoint ust_tracepoint
6418 #include <ust/ust.h>
6421 extern int serialize_to_text (char *outbuf
, int bufsize
,
6422 const char *fmt
, va_list ap
);
6424 #define GDB_PROBE_NAME "gdb"
6426 /* We dynamically search for the UST symbols instead of linking them
6427 in. This lets the user decide if the application uses static
6428 tracepoints, instead of always pulling libust.so in. This vector
6429 holds pointers to all functions we care about. */
6433 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6434 const char *fmt
, va_list ap
);
6436 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6437 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6439 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6441 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6444 void (*marker_iter_start
) (struct marker_iter
*iter
);
6445 void (*marker_iter_next
) (struct marker_iter
*iter
);
6446 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6447 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6452 /* Cast through typeof to catch incompatible API changes. Since UST
6453 only builds with gcc, we can freely use gcc extensions here
6455 #define GET_UST_SYM(SYM) \
6458 if (ust_ops.SYM == NULL) \
6459 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6460 if (ust_ops.SYM == NULL) \
6464 #define USTF(SYM) ust_ops.SYM
6466 /* Get pointers to all libust.so functions we care about. */
6471 GET_UST_SYM (serialize_to_text
);
6473 GET_UST_SYM (ltt_probe_register
);
6474 GET_UST_SYM (ltt_probe_unregister
);
6475 GET_UST_SYM (ltt_marker_connect
);
6476 GET_UST_SYM (ltt_marker_disconnect
);
6478 GET_UST_SYM (marker_iter_start
);
6479 GET_UST_SYM (marker_iter_next
);
6480 GET_UST_SYM (marker_iter_stop
);
6481 GET_UST_SYM (marker_iter_reset
);
6487 /* Given an UST marker, return the matching gdb static tracepoint.
6488 The match is done by address. */
6490 static struct tracepoint
*
6491 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6493 struct tracepoint
*tpoint
;
6495 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6497 if (tpoint
->type
!= static_tracepoint
)
6500 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6507 /* The probe function we install on lttng/ust markers. Whenever a
6508 probed ust marker is hit, this function is called. This is similar
6509 to gdb_collect, only for static tracepoints, instead of fast
6513 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6514 struct registers
*regs
, void *call_private
,
6515 const char *fmt
, va_list *args
)
6517 struct tracepoint
*tpoint
;
6518 struct static_tracepoint_ctx ctx
;
6520 /* Don't do anything until the trace run is completely set up. */
6523 trace_debug ("gdb_probe: not tracing\n");
6527 ctx
.base
.type
= static_tracepoint
;
6528 ctx
.regcache_initted
= 0;
6533 /* Wrap the regblock in a register cache (in the stack, we don't
6534 want to malloc here). */
6535 ctx
.regspace
= alloca (register_cache_size ());
6536 if (ctx
.regspace
== NULL
)
6538 trace_debug ("Trace buffer block allocation failed, skipping");
6542 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6545 trace_debug ("gdb_probe: marker not known: "
6546 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6547 mdata
->location
, mdata
->channel
,
6548 mdata
->name
, mdata
->format
);
6552 if (!tpoint
->enabled
)
6554 trace_debug ("gdb_probe: tracepoint disabled");
6558 ctx
.tpoint
= tpoint
;
6560 trace_debug ("gdb_probe: collecting marker: "
6561 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6562 mdata
->location
, mdata
->channel
,
6563 mdata
->name
, mdata
->format
);
6565 /* Test the condition if present, and collect if true. */
6566 if (tpoint
->cond
== NULL
6567 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6570 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6571 tpoint
->address
, tpoint
);
6573 if (stopping_tracepoint
6574 || trace_buffer_is_full
6575 || expr_eval_result
!= expr_eval_no_error
)
6580 /* If there was a condition and it evaluated to false, the only
6581 way we would stop tracing is if there was an error during
6582 condition expression evaluation. */
6583 if (expr_eval_result
!= expr_eval_no_error
)
6588 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6589 static tracepoint string data. This is a string passed to the
6590 tracing library by the user, at the time of the tracepoint marker
6591 call. E.g., in the UST marker call:
6593 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6595 the collected data is "str FOOBAZ".
6599 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6600 struct traceframe
*tframe
)
6602 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6603 unsigned char *bufspace
;
6606 unsigned short blocklen
;
6610 trace_debug ("Wanted to collect static trace data, "
6611 "but there's no static trace data");
6615 va_copy (copy
, *umd
->args
);
6616 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6619 trace_debug ("Want to collect ust data");
6621 /* 'S' + size + string */
6622 bufspace
= add_traceframe_block (tframe
,
6623 1 + sizeof (blocklen
) + size
+ 1);
6624 if (bufspace
== NULL
)
6626 trace_debug ("Trace buffer block allocation failed, skipping");
6630 /* Identify a static trace data block. */
6633 blocklen
= size
+ 1;
6634 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6636 va_copy (copy
, *umd
->args
);
6637 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6638 size
+ 1, umd
->fmt
, copy
);
6641 trace_debug ("Storing static tracepoint data in regblock: %s",
6642 bufspace
+ 1 + sizeof (blocklen
));
6645 /* The probe to register with lttng/ust. */
6646 static struct ltt_available_probe gdb_ust_probe
=
6653 #endif /* HAVE_UST */
6654 #endif /* IN_PROCESS_AGENT */
6656 #ifndef IN_PROCESS_AGENT
6658 /* Ask the in-process agent to run a command. Since we don't want to
6659 have to handle the IPA hitting breakpoints while running the
6660 command, we pause all threads, remove all breakpoints, and then set
6661 the helper thread re-running. We communicate with the helper
6662 thread by means of direct memory xfering, and a socket for
6666 run_inferior_command (char *cmd
, int len
)
6669 int pid
= ptid_get_pid (current_inferior
->entry
.id
);
6671 trace_debug ("run_inferior_command: running: %s", cmd
);
6674 uninsert_all_breakpoints ();
6676 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6678 reinsert_all_breakpoints ();
6684 #else /* !IN_PROCESS_AGENT */
6686 #include <sys/socket.h>
6689 #ifndef UNIX_PATH_MAX
6690 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6693 /* Where we put the socked used for synchronization. */
6694 #define SOCK_DIR P_tmpdir
6696 /* Thread ID of the helper thread. GDBserver reads this to know which
6697 is the help thread. This is an LWP id on Linux. */
6698 int helper_thread_id
;
6701 init_named_socket (const char *name
)
6704 struct sockaddr_un addr
;
6706 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6709 warning ("socket creation failed: %s", strerror (errno
));
6713 addr
.sun_family
= AF_UNIX
;
6715 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6716 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6718 result
= access (name
, F_OK
);
6722 result
= unlink (name
);
6725 warning ("unlink failed: %s", strerror (errno
));
6729 warning ("socket %s already exists; overwriting", name
);
6732 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6735 warning ("bind failed: %s", strerror (errno
));
6740 result
= listen (fd
, 1);
6743 warning ("listen: %s", strerror (errno
));
6752 gdb_agent_socket_init (void)
6755 char name
[UNIX_PATH_MAX
];
6757 result
= xsnprintf (name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6758 SOCK_DIR
, getpid ());
6759 if (result
>= UNIX_PATH_MAX
)
6761 trace_debug ("string overflow allocating socket name");
6765 fd
= init_named_socket (name
);
6767 warning ("Error initializing named socket (%s) for communication with the "
6768 "ust helper thread. Check that directory exists and that it "
6769 "is writable.", name
);
6776 /* The next marker to be returned on a qTsSTM command. */
6777 static const struct marker
*next_st
;
6779 /* Returns the first known marker. */
6784 struct marker_iter iter
;
6786 USTF(marker_iter_reset
) (&iter
);
6787 USTF(marker_iter_start
) (&iter
);
6792 /* Returns the marker following M. */
6794 const struct marker
*
6795 next_marker (const struct marker
*m
)
6797 struct marker_iter iter
;
6799 USTF(marker_iter_reset
) (&iter
);
6800 USTF(marker_iter_start
) (&iter
);
6802 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6804 if (iter
.marker
== m
)
6806 USTF(marker_iter_next
) (&iter
);
6814 /* Return an hexstr version of the STR C string, fit for sending to
6818 cstr_to_hexstr (const char *str
)
6820 int len
= strlen (str
);
6821 char *hexstr
= xmalloc (len
* 2 + 1);
6822 convert_int_to_ascii ((gdb_byte
*) str
, hexstr
, len
);
6826 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6830 response_ust_marker (char *packet
, const struct marker
*st
)
6832 char *strid
, *format
, *tmp
;
6834 next_st
= next_marker (st
);
6836 tmp
= xmalloc (strlen (st
->channel
) + 1 +
6837 strlen (st
->name
) + 1);
6838 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
6840 strid
= cstr_to_hexstr (tmp
);
6843 format
= cstr_to_hexstr (st
->format
);
6845 sprintf (packet
, "m%s:%s:%s",
6846 paddress ((uintptr_t) st
->location
),
6854 /* Return the first static tracepoint, and initialize the state
6855 machine that will iterate through all the static tracepoints. */
6858 cmd_qtfstm (char *packet
)
6860 trace_debug ("Returning first trace state variable definition");
6862 if (first_marker ())
6863 response_ust_marker (packet
, first_marker ());
6865 strcpy (packet
, "l");
6868 /* Return additional trace state variable definitions. */
6871 cmd_qtsstm (char *packet
)
6873 trace_debug ("Returning static tracepoint");
6876 response_ust_marker (packet
, next_st
);
6878 strcpy (packet
, "l");
6881 /* Disconnect the GDB probe from a marker at a given address. */
6884 unprobe_marker_at (char *packet
)
6888 struct marker_iter iter
;
6890 p
+= sizeof ("unprobe_marker_at:") - 1;
6892 p
= unpack_varlen_hex (p
, &address
);
6894 USTF(marker_iter_reset
) (&iter
);
6895 USTF(marker_iter_start
) (&iter
);
6896 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6897 if ((uintptr_t ) iter
.marker
->location
== address
)
6901 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
6905 warning ("could not disable marker %s/%s",
6906 iter
.marker
->channel
, iter
.marker
->name
);
6911 /* Connect the GDB probe to a marker at a given address. */
6914 probe_marker_at (char *packet
)
6918 struct marker_iter iter
;
6921 p
+= sizeof ("probe_marker_at:") - 1;
6923 p
= unpack_varlen_hex (p
, &address
);
6925 USTF(marker_iter_reset
) (&iter
);
6927 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
6929 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
6930 if ((uintptr_t ) m
->location
== address
)
6934 trace_debug ("found marker for address. "
6935 "ltt_marker_connect (marker = %s/%s)",
6936 m
->channel
, m
->name
);
6938 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
6940 if (result
&& result
!= -EEXIST
)
6941 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
6942 m
->channel
, m
->name
, -result
);
6946 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
6947 m
->channel
, m
->name
);
6951 strcpy (packet
, "OK");
6955 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
6960 cmd_qtstmat (char *packet
)
6964 struct marker_iter iter
;
6967 p
+= sizeof ("qTSTMat:") - 1;
6969 p
= unpack_varlen_hex (p
, &address
);
6971 USTF(marker_iter_reset
) (&iter
);
6973 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
6975 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
6976 if ((uintptr_t ) m
->location
== address
)
6978 response_ust_marker (packet
, m
);
6982 strcpy (packet
, "l");
6992 USTF(ltt_probe_register
) (&gdb_ust_probe
);
6995 #endif /* HAVE_UST */
6997 #include <sys/syscall.h>
6999 /* Helper thread of agent. */
7002 gdb_agent_helper_thread (void *arg
)
7008 listen_fd
= gdb_agent_socket_init ();
7010 if (helper_thread_id
== 0)
7011 helper_thread_id
= syscall (SYS_gettid
);
7013 if (listen_fd
== -1)
7015 warning ("could not create sync socket\n");
7022 struct sockaddr_un sockaddr
;
7027 tmp
= sizeof (sockaddr
);
7031 fd
= accept (listen_fd
, &sockaddr
, &tmp
);
7033 /* It seems an ERESTARTSYS can escape out of accept. */
7034 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7038 warning ("Accept returned %d, error: %s\n",
7039 fd
, strerror (errno
));
7045 ret
= read (fd
, buf
, 1);
7046 } while (ret
== -1 && errno
== EINTR
);
7050 warning ("reading socket (fd=%d) failed with %s",
7051 fd
, strerror (errno
));
7059 if (strcmp ("qTfSTM", cmd_buf
) == 0)
7061 cmd_qtfstm (cmd_buf
);
7063 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7065 cmd_qtsstm (cmd_buf
);
7067 else if (strncmp ("unprobe_marker_at:",
7069 sizeof ("unprobe_marker_at:") - 1) == 0)
7071 unprobe_marker_at (cmd_buf
);
7073 else if (strncmp ("probe_marker_at:",
7075 sizeof ("probe_marker_at:") - 1) == 0)
7077 probe_marker_at (cmd_buf
);
7079 else if (strncmp ("qTSTMat:",
7081 sizeof ("qTSTMat:") - 1) == 0)
7083 cmd_qtstmat (cmd_buf
);
7085 #endif /* HAVE_UST */
7088 /* Fix compiler's warning: ignoring return value of 'write'. */
7089 ret
= write (fd
, buf
, 1);
7098 #include <pthread.h>
7100 IP_AGENT_EXPORT
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7103 gdb_agent_init (void)
7110 /* We want the helper thread to be as transparent as possible, so
7111 have it inherit an all-signals-blocked mask. */
7113 sigfillset (&new_mask
);
7114 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7116 fatal ("pthread_sigmask (1) failed: %s", strerror (res
));
7118 res
= pthread_create (&thread
,
7120 gdb_agent_helper_thread
,
7123 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7125 fatal ("pthread_sigmask (2) failed: %s", strerror (res
));
7127 while (helper_thread_id
== 0)
7135 #include <sys/mman.h>
7138 IP_AGENT_EXPORT
char *gdb_tp_heap_buffer
;
7139 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer
;
7140 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer_end
;
7141 IP_AGENT_EXPORT
char *gdb_trampoline_buffer
;
7142 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_end
;
7143 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_error
;
7145 /* Record the result of getting buffer space for fast tracepoint
7146 trampolines. Any error message is copied, since caller may not be
7147 using persistent storage. */
7150 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7152 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7153 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7155 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7157 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7160 static void __attribute__ ((constructor
))
7161 initialize_tracepoint_ftlib (void)
7163 initialize_tracepoint ();
7168 #endif /* IN_PROCESS_AGENT */
7170 /* Return a timestamp, expressed as microseconds of the usual Unix
7171 time. (As the result is a 64-bit number, it will not overflow any
7175 get_timestamp (void)
7179 if (gettimeofday (&tv
, 0) != 0)
7182 return (LONGEST
) tv
.tv_sec
* 1000000 + tv
.tv_usec
;
7186 initialize_tracepoint (void)
7188 /* There currently no way to change the buffer size. */
7189 const int sizeOfBuffer
= 5 * 1024 * 1024;
7190 unsigned char *buf
= xmalloc (sizeOfBuffer
);
7191 init_trace_buffer (buf
, sizeOfBuffer
);
7193 /* Wire trace state variable 1 to be the timestamp. This will be
7194 uploaded to GDB upon connection and become one of its trace state
7195 variables. (In case you're wondering, if GDB already has a trace
7196 variable numbered 1, it will be renumbered.) */
7197 create_trace_state_variable (1, 0);
7198 set_trace_state_variable_name (1, "trace_timestamp");
7199 set_trace_state_variable_getter (1, get_timestamp
);
7201 #ifdef IN_PROCESS_AGENT
7206 pagesize
= sysconf (_SC_PAGE_SIZE
);
7210 gdb_tp_heap_buffer
= xmalloc (5 * 1024 * 1024);
7212 #define SCRATCH_BUFFER_NPAGES 20
7214 /* Allocate scratch buffer aligned on a page boundary, at a low
7215 address (close to the main executable's code). */
7216 for (addr
= pagesize
; addr
!= 0; addr
+= pagesize
)
7218 gdb_jump_pad_buffer
= mmap ((void *) addr
, pagesize
* SCRATCH_BUFFER_NPAGES
,
7219 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
7220 MAP_PRIVATE
| MAP_ANONYMOUS
| MAP_FIXED
,
7222 if (gdb_jump_pad_buffer
!= MAP_FAILED
)
7228 initialize_tracepoint: mmap'ing jump pad buffer failed with %s",
7231 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ pagesize
* SCRATCH_BUFFER_NPAGES
;
7234 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7236 /* It's not a fatal error for something to go wrong with trampoline
7237 buffer setup, but it can be mysterious, so create a channel to
7238 report back on what went wrong, using a fixed size since we may
7239 not be able to allocate space later when the problem occurs. */
7240 gdb_trampoline_buffer_error
= xmalloc (IPA_BUFSIZ
);
7242 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7244 initialize_low_tracepoint ();