1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2013 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 *, ...) ATTRIBUTE_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 #ifndef IN_PROCESS_AGENT
1350 static CORE_ADDR
traceframe_get_pc (struct traceframe
*tframe
);
1351 static int traceframe_read_tsv (int num
, LONGEST
*val
);
1354 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1355 struct tracepoint
*tpoint
);
1357 #ifndef IN_PROCESS_AGENT
1358 static void clear_readonly_regions (void);
1359 static void clear_installed_tracepoints (void);
1362 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1364 struct tracepoint
*tpoint
);
1365 #ifndef IN_PROCESS_AGENT
1366 static void collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
1368 struct tracepoint
*tpoint
, int current_step
);
1369 static void compile_tracepoint_condition (struct tracepoint
*tpoint
,
1370 CORE_ADDR
*jump_entry
);
1372 static void do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1374 struct tracepoint
*tpoint
,
1375 struct traceframe
*tframe
,
1376 struct tracepoint_action
*taction
);
1378 #ifndef IN_PROCESS_AGENT
1379 static struct tracepoint
*fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR
);
1381 static void install_tracepoint (struct tracepoint
*, char *own_buf
);
1382 static void download_tracepoint (struct tracepoint
*);
1383 static int install_fast_tracepoint (struct tracepoint
*, char *errbuf
);
1384 static void clone_fast_tracepoint (struct tracepoint
*to
,
1385 const struct tracepoint
*from
);
1388 static LONGEST
get_timestamp (void);
1390 #if defined(__GNUC__)
1391 # define memory_barrier() asm volatile ("" : : : "memory")
1393 # define memory_barrier() do {} while (0)
1396 /* We only build the IPA if this builtin is supported, and there are
1397 no uses of this in GDBserver itself, so we're safe in defining this
1399 #define cmpxchg(mem, oldval, newval) \
1400 __sync_val_compare_and_swap (mem, oldval, newval)
1402 /* Record that an error occurred during expression evaluation. */
1405 record_tracepoint_error (struct tracepoint
*tpoint
, const char *which
,
1406 enum eval_result_type rtype
)
1408 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1409 tpoint
->number
, paddress (tpoint
->address
), which
, rtype
);
1411 #ifdef IN_PROCESS_AGENT
1412 /* Only record the first error we get. */
1413 if (cmpxchg (&expr_eval_result
,
1415 rtype
) != expr_eval_no_error
)
1418 if (expr_eval_result
!= expr_eval_no_error
)
1422 error_tracepoint
= tpoint
;
1425 /* Trace buffer management. */
1428 clear_trace_buffer (void)
1430 trace_buffer_start
= trace_buffer_lo
;
1431 trace_buffer_free
= trace_buffer_lo
;
1432 trace_buffer_end_free
= trace_buffer_hi
;
1433 trace_buffer_wrap
= trace_buffer_hi
;
1434 /* A traceframe with zeroed fields marks the end of trace data. */
1435 ((struct traceframe
*) trace_buffer_free
)->tpnum
= 0;
1436 ((struct traceframe
*) trace_buffer_free
)->data_size
= 0;
1437 traceframe_read_count
= traceframe_write_count
= 0;
1438 traceframes_created
= 0;
1441 #ifndef IN_PROCESS_AGENT
1444 clear_inferior_trace_buffer (void)
1446 CORE_ADDR ipa_trace_buffer_lo
;
1447 CORE_ADDR ipa_trace_buffer_hi
;
1448 struct traceframe ipa_traceframe
= { 0 };
1449 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
1451 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
1452 &ipa_trace_buffer_lo
);
1453 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
1454 &ipa_trace_buffer_hi
);
1456 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
1457 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
1458 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
1459 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
1461 /* A traceframe with zeroed fields marks the end of trace data. */
1462 write_inferior_memory (ipa_sym_addrs
.addr_trace_buffer_ctrl
,
1463 (unsigned char *) &ipa_trace_buffer_ctrl
,
1464 sizeof (ipa_trace_buffer_ctrl
));
1466 write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
, 0);
1468 /* A traceframe with zeroed fields marks the end of trace data. */
1469 write_inferior_memory (ipa_trace_buffer_lo
,
1470 (unsigned char *) &ipa_traceframe
,
1471 sizeof (ipa_traceframe
));
1473 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
, 0);
1474 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
, 0);
1475 write_inferior_integer (ipa_sym_addrs
.addr_traceframes_created
, 0);
1481 init_trace_buffer (unsigned char *buf
, int bufsize
)
1483 trace_buffer_lo
= buf
;
1484 trace_buffer_hi
= trace_buffer_lo
+ bufsize
;
1486 clear_trace_buffer ();
1489 #ifdef IN_PROCESS_AGENT
1491 IP_AGENT_EXPORT
void ATTR_USED ATTR_NOINLINE
1492 about_to_request_buffer_space (void)
1494 /* GDBserver places breakpoint here while it goes about to flush
1495 data at random times. */
1496 UNKNOWN_SIDE_EFFECTS();
1501 /* Carve out a piece of the trace buffer, returning NULL in case of
1505 trace_buffer_alloc (size_t amt
)
1507 unsigned char *rslt
;
1508 struct trace_buffer_control
*tbctrl
;
1510 #ifdef IN_PROCESS_AGENT
1511 unsigned int prev
, prev_filtered
;
1512 unsigned int commit_count
;
1513 unsigned int commit
;
1514 unsigned int readout
;
1516 struct traceframe
*oldest
;
1517 unsigned char *new_start
;
1520 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1521 (long) amt
, (long) sizeof (struct traceframe
));
1523 /* Account for the EOB marker. */
1524 amt
+= sizeof (struct traceframe
);
1526 #ifdef IN_PROCESS_AGENT
1530 /* Read the current token and extract the index to try to write to,
1531 storing it in CURR. */
1532 prev
= trace_buffer_ctrl_curr
;
1533 prev_filtered
= prev
& ~GDBSERVER_FLUSH_COUNT_MASK
;
1534 curr
= prev_filtered
+ 1;
1538 about_to_request_buffer_space ();
1540 /* Start out with a copy of the current state. GDBserver may be
1541 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1542 be able to commit anyway if that happens. */
1543 trace_buffer_ctrl
[curr
]
1544 = trace_buffer_ctrl
[prev_filtered
];
1545 trace_debug ("trying curr=%u", curr
);
1547 /* The GDBserver's agent doesn't need all that syncing, and always
1548 updates TCB 0 (there's only one, mind you). */
1551 tbctrl
= &trace_buffer_ctrl
[curr
];
1553 /* Offsets are easier to grok for debugging than raw addresses,
1554 especially for the small trace buffer sizes that are useful for
1556 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1558 (int) (tbctrl
->start
- trace_buffer_lo
),
1559 (int) (tbctrl
->free
- trace_buffer_lo
),
1560 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1561 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1562 (int) (trace_buffer_hi
- trace_buffer_lo
));
1564 /* The algorithm here is to keep trying to get a contiguous block of
1565 the requested size, possibly discarding older traceframes to free
1566 up space. Since free space might come in one or two pieces,
1567 depending on whether discarded traceframes wrapped around at the
1568 high end of the buffer, we test both pieces after each
1572 /* First, if we have two free parts, try the upper one first. */
1573 if (tbctrl
->end_free
< tbctrl
->free
)
1575 if (tbctrl
->free
+ amt
<= trace_buffer_hi
)
1576 /* We have enough in the upper part. */
1580 /* Our high part of free space wasn't enough. Give up
1581 on it for now, set wraparound. We will recover the
1582 space later, if/when the wrapped-around traceframe is
1584 trace_debug ("Upper part too small, setting wraparound");
1585 tbctrl
->wrap
= tbctrl
->free
;
1586 tbctrl
->free
= trace_buffer_lo
;
1590 /* The normal case. */
1591 if (tbctrl
->free
+ amt
<= tbctrl
->end_free
)
1594 #ifdef IN_PROCESS_AGENT
1595 /* The IP Agent's buffer is always circular. It isn't used
1596 currently, but `circular_trace_buffer' could represent
1597 GDBserver's mode. If we didn't find space, ask GDBserver to
1600 flush_trace_buffer ();
1604 trace_debug ("gdbserver flushed buffer, retrying");
1608 /* GDBserver cancelled the tracing. Bail out as well. */
1611 /* If we're here, then neither part is big enough, and
1612 non-circular trace buffers are now full. */
1613 if (!circular_trace_buffer
)
1615 trace_debug ("Not enough space in the trace buffer");
1619 trace_debug ("Need more space in the trace buffer");
1621 /* If we have a circular buffer, we can try discarding the
1622 oldest traceframe and see if that helps. */
1623 oldest
= FIRST_TRACEFRAME ();
1624 if (oldest
->tpnum
== 0)
1626 /* Not good; we have no traceframes to free. Perhaps we're
1627 asking for a block that is larger than the buffer? In
1628 any case, give up. */
1629 trace_debug ("No traceframes to discard");
1633 /* We don't run this code in the in-process agent currently.
1634 E.g., we could leave the in-process agent in autonomous
1635 circular mode if we only have fast tracepoints. If we do
1636 that, then this bit becomes racy with GDBserver, which also
1637 writes to this counter. */
1638 --traceframe_write_count
;
1640 new_start
= (unsigned char *) NEXT_TRACEFRAME (oldest
);
1641 /* If we freed the traceframe that wrapped around, go back
1642 to the non-wrap case. */
1643 if (new_start
< tbctrl
->start
)
1645 trace_debug ("Discarding past the wraparound");
1646 tbctrl
->wrap
= trace_buffer_hi
;
1648 tbctrl
->start
= new_start
;
1649 tbctrl
->end_free
= tbctrl
->start
;
1651 trace_debug ("Discarded a traceframe\n"
1652 "Trace buffer [%d], start=%d free=%d "
1653 "endfree=%d wrap=%d hi=%d",
1655 (int) (tbctrl
->start
- trace_buffer_lo
),
1656 (int) (tbctrl
->free
- trace_buffer_lo
),
1657 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1658 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1659 (int) (trace_buffer_hi
- trace_buffer_lo
));
1661 /* Now go back around the loop. The discard might have resulted
1662 in either one or two pieces of free space, so we want to try
1663 both before freeing any more traceframes. */
1667 /* If we get here, we know we can provide the asked-for space. */
1669 rslt
= tbctrl
->free
;
1671 /* Adjust the request back down, now that we know we have space for
1672 the marker, but don't commit to AMT yet, we may still need to
1673 restart the operation if GDBserver touches the trace buffer
1674 (obviously only important in the in-process agent's version). */
1675 tbctrl
->free
+= (amt
- sizeof (struct traceframe
));
1677 /* Or not. If GDBserver changed the trace buffer behind our back,
1678 we get to restart a new allocation attempt. */
1680 #ifdef IN_PROCESS_AGENT
1681 /* Build the tentative token. */
1682 commit_count
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) + 0x100)
1683 & GDBSERVER_FLUSH_COUNT_MASK_CURR
);
1684 commit
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) << 12)
1688 /* Try to commit it. */
1689 readout
= cmpxchg (&trace_buffer_ctrl_curr
, prev
, commit
);
1690 if (readout
!= prev
)
1692 trace_debug ("GDBserver has touched the trace buffer, restarting."
1693 " (prev=%08x, commit=%08x, readout=%08x)",
1694 prev
, commit
, readout
);
1698 /* Hold your horses here. Even if that change was committed,
1699 GDBserver could come in, and clobber it. We need to hold to be
1700 able to tell if GDBserver clobbers before or after we committed
1701 the change. Whenever GDBserver goes about touching the IPA
1702 buffer, it sets a breakpoint in this routine, so we have a sync
1704 about_to_request_buffer_space ();
1706 /* Check if the change has been effective, even if GDBserver stopped
1707 us at the breakpoint. */
1710 unsigned int refetch
;
1714 refetch
= trace_buffer_ctrl_curr
;
1716 if (refetch
== commit
1717 || ((refetch
& GDBSERVER_FLUSH_COUNT_MASK_PREV
) >> 12) == commit_count
)
1720 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1721 "readout=%08x, refetch=%08x)",
1722 prev
, commit
, readout
, refetch
);
1726 trace_debug ("GDBserver has touched the trace buffer, not effective."
1727 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1728 prev
, commit
, readout
, refetch
);
1734 /* We have a new piece of the trace buffer. Hurray! */
1736 /* Add an EOB marker just past this allocation. */
1737 ((struct traceframe
*) tbctrl
->free
)->tpnum
= 0;
1738 ((struct traceframe
*) tbctrl
->free
)->data_size
= 0;
1740 /* Adjust the request back down, now that we know we have space for
1742 amt
-= sizeof (struct traceframe
);
1746 trace_debug ("Allocated %d bytes", (int) amt
);
1747 trace_debug ("Trace buffer [%d] start=%d free=%d "
1748 "endfree=%d wrap=%d hi=%d",
1750 (int) (tbctrl
->start
- trace_buffer_lo
),
1751 (int) (tbctrl
->free
- trace_buffer_lo
),
1752 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1753 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1754 (int) (trace_buffer_hi
- trace_buffer_lo
));
1760 #ifndef IN_PROCESS_AGENT
1762 /* Return the total free space. This is not necessarily the largest
1763 block we can allocate, because of the two-part case. */
1768 if (trace_buffer_free
<= trace_buffer_end_free
)
1769 return trace_buffer_end_free
- trace_buffer_free
;
1771 return ((trace_buffer_end_free
- trace_buffer_lo
)
1772 + (trace_buffer_hi
- trace_buffer_free
));
1775 /* An 'S' in continuation packets indicates remainder are for
1778 static int seen_step_action_flag
;
1780 /* Create a tracepoint (location) with given number and address. Add this
1781 new tracepoint to list and sort this list. */
1783 static struct tracepoint
*
1784 add_tracepoint (int num
, CORE_ADDR addr
)
1786 struct tracepoint
*tpoint
, **tp_next
;
1788 tpoint
= xmalloc (sizeof (struct tracepoint
));
1789 tpoint
->number
= num
;
1790 tpoint
->address
= addr
;
1791 tpoint
->numactions
= 0;
1792 tpoint
->actions
= NULL
;
1793 tpoint
->actions_str
= NULL
;
1794 tpoint
->cond
= NULL
;
1795 tpoint
->num_step_actions
= 0;
1796 tpoint
->step_actions
= NULL
;
1797 tpoint
->step_actions_str
= NULL
;
1798 /* Start all off as regular (slow) tracepoints. */
1799 tpoint
->type
= trap_tracepoint
;
1800 tpoint
->orig_size
= -1;
1801 tpoint
->source_strings
= NULL
;
1802 tpoint
->compiled_cond
= 0;
1803 tpoint
->handle
= NULL
;
1804 tpoint
->next
= NULL
;
1806 /* Find a place to insert this tracepoint into list in order to keep
1807 the tracepoint list still in the ascending order. There may be
1808 multiple tracepoints at the same address as TPOINT's, and this
1809 guarantees TPOINT is inserted after all the tracepoints which are
1810 set at the same address. For example, fast tracepoints A, B, C are
1811 set at the same address, and D is to be insert at the same place as
1814 -->| A |--> | B |-->| C |->...
1816 One jump pad was created for tracepoint A, B, and C, and the target
1817 address of A is referenced/used in jump pad. So jump pad will let
1818 inferior jump to A. If D is inserted in front of A, like this,
1820 -->| D |-->| A |--> | B |-->| C |->...
1822 without updating jump pad, D is not reachable during collect, which
1823 is wrong. As we can see, the order of B, C and D doesn't matter, but
1824 A should always be the `first' one. */
1825 for (tp_next
= &tracepoints
;
1826 (*tp_next
) != NULL
&& (*tp_next
)->address
<= tpoint
->address
;
1827 tp_next
= &(*tp_next
)->next
)
1829 tpoint
->next
= *tp_next
;
1831 last_tracepoint
= tpoint
;
1833 seen_step_action_flag
= 0;
1838 #ifndef IN_PROCESS_AGENT
1840 /* Return the tracepoint with the given number and address, or NULL. */
1842 static struct tracepoint
*
1843 find_tracepoint (int id
, CORE_ADDR addr
)
1845 struct tracepoint
*tpoint
;
1847 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
1848 if (tpoint
->number
== id
&& tpoint
->address
== addr
)
1854 /* Remove TPOINT from global list. */
1857 remove_tracepoint (struct tracepoint
*tpoint
)
1859 struct tracepoint
*tp
, *tp_prev
;
1861 for (tp
= tracepoints
, tp_prev
= NULL
; tp
&& tp
!= tpoint
;
1862 tp_prev
= tp
, tp
= tp
->next
)
1868 tp_prev
->next
= tp
->next
;
1870 tracepoints
= tp
->next
;
1876 /* There may be several tracepoints with the same number (because they
1877 are "locations", in GDB parlance); return the next one after the
1878 given tracepoint, or search from the beginning of the list if the
1879 first argument is NULL. */
1881 static struct tracepoint
*
1882 find_next_tracepoint_by_number (struct tracepoint
*prev_tp
, int num
)
1884 struct tracepoint
*tpoint
;
1887 tpoint
= prev_tp
->next
;
1889 tpoint
= tracepoints
;
1890 for (; tpoint
; tpoint
= tpoint
->next
)
1891 if (tpoint
->number
== num
)
1900 save_string (const char *str
, size_t len
)
1904 s
= xmalloc (len
+ 1);
1905 memcpy (s
, str
, len
);
1911 /* Append another action to perform when the tracepoint triggers. */
1914 add_tracepoint_action (struct tracepoint
*tpoint
, char *packet
)
1920 seen_step_action_flag
= 1;
1928 char *act_start
= act
;
1929 struct tracepoint_action
*action
= NULL
;
1935 struct collect_memory_action
*maction
;
1939 maction
= xmalloc (sizeof *maction
);
1940 maction
->base
.type
= *act
;
1941 maction
->base
.ops
= &m_tracepoint_action_ops
;
1942 action
= &maction
->base
;
1945 is_neg
= (*act
== '-');
1948 act
= unpack_varlen_hex (act
, &basereg
);
1950 act
= unpack_varlen_hex (act
, &maction
->addr
);
1952 act
= unpack_varlen_hex (act
, &maction
->len
);
1953 maction
->basereg
= (is_neg
1956 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
1957 pulongest (maction
->len
),
1958 paddress (maction
->addr
), maction
->basereg
);
1963 struct collect_registers_action
*raction
;
1965 raction
= xmalloc (sizeof *raction
);
1966 raction
->base
.type
= *act
;
1967 raction
->base
.ops
= &r_tracepoint_action_ops
;
1968 action
= &raction
->base
;
1970 trace_debug ("Want to collect registers");
1972 /* skip past hex digits of mask for now */
1973 while (isxdigit(*act
))
1979 struct collect_static_trace_data_action
*raction
;
1981 raction
= xmalloc (sizeof *raction
);
1982 raction
->base
.type
= *act
;
1983 raction
->base
.ops
= &l_tracepoint_action_ops
;
1984 action
= &raction
->base
;
1986 trace_debug ("Want to collect static trace data");
1991 trace_debug ("Unexpected step action, ignoring");
1996 struct eval_expr_action
*xaction
;
1998 xaction
= xmalloc (sizeof (*xaction
));
1999 xaction
->base
.type
= *act
;
2000 xaction
->base
.ops
= &x_tracepoint_action_ops
;
2001 action
= &xaction
->base
;
2003 trace_debug ("Want to evaluate expression");
2004 xaction
->expr
= gdb_parse_agent_expr (&act
);
2008 trace_debug ("unknown trace action '%c', ignoring...", *act
);
2017 if (seen_step_action_flag
)
2019 tpoint
->num_step_actions
++;
2021 tpoint
->step_actions
2022 = xrealloc (tpoint
->step_actions
,
2023 (sizeof (*tpoint
->step_actions
)
2024 * tpoint
->num_step_actions
));
2025 tpoint
->step_actions_str
2026 = xrealloc (tpoint
->step_actions_str
,
2027 (sizeof (*tpoint
->step_actions_str
)
2028 * tpoint
->num_step_actions
));
2029 tpoint
->step_actions
[tpoint
->num_step_actions
- 1] = action
;
2030 tpoint
->step_actions_str
[tpoint
->num_step_actions
- 1]
2031 = save_string (act_start
, act
- act_start
);
2035 tpoint
->numactions
++;
2037 = xrealloc (tpoint
->actions
,
2038 sizeof (*tpoint
->actions
) * tpoint
->numactions
);
2040 = xrealloc (tpoint
->actions_str
,
2041 sizeof (*tpoint
->actions_str
) * tpoint
->numactions
);
2042 tpoint
->actions
[tpoint
->numactions
- 1] = action
;
2043 tpoint
->actions_str
[tpoint
->numactions
- 1]
2044 = save_string (act_start
, act
- act_start
);
2051 /* Find or create a trace state variable with the given number. */
2053 static struct trace_state_variable
*
2054 get_trace_state_variable (int num
)
2056 struct trace_state_variable
*tsv
;
2058 #ifdef IN_PROCESS_AGENT
2059 /* Search for an existing variable. */
2060 for (tsv
= alloced_trace_state_variables
; tsv
; tsv
= tsv
->next
)
2061 if (tsv
->number
== num
)
2065 /* Search for an existing variable. */
2066 for (tsv
= trace_state_variables
; tsv
; tsv
= tsv
->next
)
2067 if (tsv
->number
== num
)
2073 /* Find or create a trace state variable with the given number. */
2075 static struct trace_state_variable
*
2076 create_trace_state_variable (int num
, int gdb
)
2078 struct trace_state_variable
*tsv
;
2080 tsv
= get_trace_state_variable (num
);
2084 /* Create a new variable. */
2085 tsv
= xmalloc (sizeof (struct trace_state_variable
));
2087 tsv
->initial_value
= 0;
2091 #ifdef IN_PROCESS_AGENT
2094 tsv
->next
= alloced_trace_state_variables
;
2095 alloced_trace_state_variables
= tsv
;
2100 tsv
->next
= trace_state_variables
;
2101 trace_state_variables
= tsv
;
2106 IP_AGENT_EXPORT LONGEST
2107 get_trace_state_variable_value (int num
)
2109 struct trace_state_variable
*tsv
;
2111 tsv
= get_trace_state_variable (num
);
2115 trace_debug ("No trace state variable %d, skipping value get", num
);
2119 /* Call a getter function if we have one. While it's tempting to
2120 set up something to only call the getter once per tracepoint hit,
2121 it could run afoul of thread races. Better to let the getter
2122 handle it directly, if necessary to worry about it. */
2124 tsv
->value
= (tsv
->getter
) ();
2126 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2127 num
, plongest (tsv
->value
));
2132 IP_AGENT_EXPORT
void
2133 set_trace_state_variable_value (int num
, LONGEST val
)
2135 struct trace_state_variable
*tsv
;
2137 tsv
= get_trace_state_variable (num
);
2141 trace_debug ("No trace state variable %d, skipping value set", num
);
2149 agent_get_trace_state_variable_value (int num
)
2151 return get_trace_state_variable_value (num
);
2155 agent_set_trace_state_variable_value (int num
, LONGEST val
)
2157 set_trace_state_variable_value (num
, val
);
2161 set_trace_state_variable_name (int num
, const char *name
)
2163 struct trace_state_variable
*tsv
;
2165 tsv
= get_trace_state_variable (num
);
2169 trace_debug ("No trace state variable %d, skipping name set", num
);
2173 tsv
->name
= (char *) name
;
2177 set_trace_state_variable_getter (int num
, LONGEST (*getter
) (void))
2179 struct trace_state_variable
*tsv
;
2181 tsv
= get_trace_state_variable (num
);
2185 trace_debug ("No trace state variable %d, skipping getter set", num
);
2189 tsv
->getter
= getter
;
2192 /* Add a raw traceframe for the given tracepoint. */
2194 static struct traceframe
*
2195 add_traceframe (struct tracepoint
*tpoint
)
2197 struct traceframe
*tframe
;
2199 tframe
= trace_buffer_alloc (sizeof (struct traceframe
));
2204 tframe
->tpnum
= tpoint
->number
;
2205 tframe
->data_size
= 0;
2210 /* Add a block to the traceframe currently being worked on. */
2212 static unsigned char *
2213 add_traceframe_block (struct traceframe
*tframe
,
2214 struct tracepoint
*tpoint
, int amt
)
2216 unsigned char *block
;
2221 block
= trace_buffer_alloc (amt
);
2226 gdb_assert (tframe
->tpnum
== tpoint
->number
);
2228 tframe
->data_size
+= amt
;
2229 tpoint
->traceframe_usage
+= amt
;
2234 /* Flag that the current traceframe is finished. */
2237 finish_traceframe (struct traceframe
*tframe
)
2239 ++traceframe_write_count
;
2240 ++traceframes_created
;
2243 #ifndef IN_PROCESS_AGENT
2245 /* Given a traceframe number NUM, find the NUMth traceframe in the
2248 static struct traceframe
*
2249 find_traceframe (int num
)
2251 struct traceframe
*tframe
;
2254 for (tframe
= FIRST_TRACEFRAME ();
2256 tframe
= NEXT_TRACEFRAME (tframe
))
2267 get_traceframe_address (struct traceframe
*tframe
)
2270 struct tracepoint
*tpoint
;
2272 addr
= traceframe_get_pc (tframe
);
2277 /* Fallback strategy, will be incorrect for while-stepping frames
2278 and multi-location tracepoints. */
2279 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2280 return tpoint
->address
;
2283 /* Search for the next traceframe whose address is inside or outside
2286 static struct traceframe
*
2287 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2290 struct traceframe
*tframe
;
2293 *tfnump
= current_traceframe
+ 1;
2294 tframe
= find_traceframe (*tfnump
);
2295 /* The search is not supposed to wrap around. */
2302 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2304 tfaddr
= get_traceframe_address (tframe
);
2306 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2307 : (lo
> tfaddr
|| tfaddr
> hi
))
2316 /* Search for the next traceframe recorded by the given tracepoint.
2317 Note that for multi-location tracepoints, this will find whatever
2318 location appears first. */
2320 static struct traceframe
*
2321 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2323 struct traceframe
*tframe
;
2325 *tfnump
= current_traceframe
+ 1;
2326 tframe
= find_traceframe (*tfnump
);
2327 /* The search is not supposed to wrap around. */
2334 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2336 if (tframe
->tpnum
== num
)
2347 #ifndef IN_PROCESS_AGENT
2349 /* Clear all past trace state. */
2352 cmd_qtinit (char *packet
)
2354 struct trace_state_variable
*tsv
, *prev
, *next
;
2356 /* Make sure we don't try to read from a trace frame. */
2357 current_traceframe
= -1;
2359 trace_debug ("Initializing the trace");
2361 clear_installed_tracepoints ();
2362 clear_readonly_regions ();
2365 last_tracepoint
= NULL
;
2367 /* Clear out any leftover trace state variables. Ones with target
2368 defined getters should be kept however. */
2370 tsv
= trace_state_variables
;
2373 trace_debug ("Looking at var %d", tsv
->number
);
2374 if (tsv
->getter
== NULL
)
2380 trace_state_variables
= next
;
2381 trace_debug ("Deleting var %d", tsv
->number
);
2392 clear_trace_buffer ();
2393 clear_inferior_trace_buffer ();
2398 /* Unprobe the UST marker at ADDRESS. */
2401 unprobe_marker_at (CORE_ADDR address
)
2403 char cmd
[IPA_CMD_BUF_SIZE
];
2405 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2406 run_inferior_command (cmd
, strlen (cmd
) + 1);
2409 /* Restore the program to its pre-tracing state. This routine may be called
2410 in error situations, so it needs to be careful about only restoring
2411 from known-valid bits. */
2414 clear_installed_tracepoints (void)
2416 struct tracepoint
*tpoint
;
2417 struct tracepoint
*prev_stpoint
;
2420 cancel_breakpoints ();
2422 prev_stpoint
= NULL
;
2424 /* Restore any bytes overwritten by tracepoints. */
2425 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2427 /* Catch the case where we might try to remove a tracepoint that
2428 was never actually installed. */
2429 if (tpoint
->handle
== NULL
)
2431 trace_debug ("Tracepoint %d at 0x%s was "
2432 "never installed, nothing to clear",
2433 tpoint
->number
, paddress (tpoint
->address
));
2437 switch (tpoint
->type
)
2439 case trap_tracepoint
:
2440 delete_breakpoint (tpoint
->handle
);
2442 case fast_tracepoint
:
2443 delete_fast_tracepoint_jump (tpoint
->handle
);
2445 case static_tracepoint
:
2446 if (prev_stpoint
!= NULL
2447 && prev_stpoint
->address
== tpoint
->address
)
2448 /* Nothing to do. We already unprobed a tracepoint set at
2449 this marker address (and there can only be one probe
2454 unprobe_marker_at (tpoint
->address
);
2455 prev_stpoint
= tpoint
;
2460 tpoint
->handle
= NULL
;
2466 /* Parse a packet that defines a tracepoint. */
2469 cmd_qtdp (char *own_buf
)
2472 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2473 int trail_hyphen
= 0;
2477 struct tracepoint
*tpoint
;
2479 char *packet
= own_buf
;
2481 packet
+= strlen ("QTDP:");
2483 /* A hyphen at the beginning marks a packet specifying actions for a
2484 tracepoint already supplied. */
2491 packet
= unpack_varlen_hex (packet
, &num
);
2492 ++packet
; /* skip a colon */
2493 packet
= unpack_varlen_hex (packet
, &addr
);
2494 ++packet
; /* skip a colon */
2496 /* See if we already have this tracepoint. */
2497 tpoint
= find_tracepoint (num
, addr
);
2501 /* Duplicate tracepoints are never allowed. */
2504 trace_debug ("Tracepoint error: tracepoint %d"
2505 " at 0x%s already exists",
2506 (int) num
, paddress (addr
));
2507 write_enn (own_buf
);
2511 tpoint
= add_tracepoint (num
, addr
);
2513 tpoint
->enabled
= (*packet
== 'E');
2514 ++packet
; /* skip 'E' */
2515 ++packet
; /* skip a colon */
2516 packet
= unpack_varlen_hex (packet
, &count
);
2517 tpoint
->step_count
= count
;
2518 ++packet
; /* skip a colon */
2519 packet
= unpack_varlen_hex (packet
, &count
);
2520 tpoint
->pass_count
= count
;
2521 /* See if we have any of the additional optional fields. */
2522 while (*packet
== ':')
2527 tpoint
->type
= fast_tracepoint
;
2529 packet
= unpack_varlen_hex (packet
, &count
);
2530 tpoint
->orig_size
= count
;
2532 else if (*packet
== 'S')
2534 tpoint
->type
= static_tracepoint
;
2537 else if (*packet
== 'X')
2539 actparm
= (char *) packet
;
2540 tpoint
->cond
= gdb_parse_agent_expr (&actparm
);
2543 else if (*packet
== '-')
2545 else if (*packet
== '\0')
2548 trace_debug ("Unknown optional tracepoint field");
2553 trace_debug ("Also has actions\n");
2556 trace_debug ("Defined %stracepoint %d at 0x%s, "
2557 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2558 tpoint
->type
== fast_tracepoint
? "fast "
2559 : tpoint
->type
== static_tracepoint
? "static " : "",
2560 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2561 tpoint
->step_count
, tpoint
->pass_count
);
2564 add_tracepoint_action (tpoint
, packet
);
2567 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2568 (int) num
, paddress (addr
));
2569 write_enn (own_buf
);
2573 /* Install tracepoint during tracing only once for each tracepoint location.
2574 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2575 determine the last QTDP packet for one tracepoint location by checking
2576 trailing hyphen in QTDP packet. */
2577 if (tracing
&& !trail_hyphen
)
2579 struct tracepoint
*tp
= NULL
;
2581 /* Pause all threads temporarily while we patch tracepoints. */
2584 /* download_tracepoint will update global `tracepoints'
2585 list, so it is unsafe to leave threads in jump pad. */
2586 stabilize_threads ();
2588 /* Freeze threads. */
2592 if (tpoint
->type
!= trap_tracepoint
)
2594 /* Find another fast or static tracepoint at the same address. */
2595 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2597 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2598 && tp
->number
!= tpoint
->number
)
2602 /* TPOINT is installed at the same address as TP. */
2605 if (tpoint
->type
== fast_tracepoint
)
2606 clone_fast_tracepoint (tpoint
, tp
);
2607 else if (tpoint
->type
== static_tracepoint
)
2608 tpoint
->handle
= (void *) -1;
2612 if (use_agent
&& tpoint
->type
== fast_tracepoint
2613 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2615 /* Download and install fast tracepoint by agent. */
2616 if (tracepoint_send_agent (tpoint
) == 0)
2620 write_enn (own_buf
);
2621 remove_tracepoint (tpoint
);
2626 download_tracepoint (tpoint
);
2628 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2630 install_tracepoint (tpoint
, own_buf
);
2631 if (strcmp (own_buf
, "OK") != 0)
2632 remove_tracepoint (tpoint
);
2646 cmd_qtdpsrc (char *own_buf
)
2648 ULONGEST num
, addr
, start
, slen
;
2649 struct tracepoint
*tpoint
;
2650 char *packet
= own_buf
;
2651 char *saved
, *srctype
, *src
;
2653 struct source_string
*last
, *newlast
;
2655 packet
+= strlen ("QTDPsrc:");
2657 packet
= unpack_varlen_hex (packet
, &num
);
2658 ++packet
; /* skip a colon */
2659 packet
= unpack_varlen_hex (packet
, &addr
);
2660 ++packet
; /* skip a colon */
2662 /* See if we already have this tracepoint. */
2663 tpoint
= find_tracepoint (num
, addr
);
2667 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2668 (int) num
, paddress (addr
));
2669 write_enn (own_buf
);
2674 packet
= strchr (packet
, ':');
2675 srctype
= xmalloc (packet
- saved
+ 1);
2676 memcpy (srctype
, saved
, packet
- saved
);
2677 srctype
[packet
- saved
] = '\0';
2679 packet
= unpack_varlen_hex (packet
, &start
);
2680 ++packet
; /* skip a colon */
2681 packet
= unpack_varlen_hex (packet
, &slen
);
2682 ++packet
; /* skip a colon */
2683 src
= xmalloc (slen
+ 1);
2684 nbytes
= unhexify (src
, packet
, strlen (packet
) / 2);
2687 newlast
= xmalloc (sizeof (struct source_string
));
2688 newlast
->type
= srctype
;
2690 newlast
->next
= NULL
;
2691 /* Always add a source string to the end of the list;
2692 this keeps sequences of actions/commands in the right
2694 if (tpoint
->source_strings
)
2696 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2698 last
->next
= newlast
;
2701 tpoint
->source_strings
= newlast
;
2707 cmd_qtdv (char *own_buf
)
2709 ULONGEST num
, val
, builtin
;
2712 struct trace_state_variable
*tsv
;
2713 char *packet
= own_buf
;
2715 packet
+= strlen ("QTDV:");
2717 packet
= unpack_varlen_hex (packet
, &num
);
2718 ++packet
; /* skip a colon */
2719 packet
= unpack_varlen_hex (packet
, &val
);
2720 ++packet
; /* skip a colon */
2721 packet
= unpack_varlen_hex (packet
, &builtin
);
2722 ++packet
; /* skip a colon */
2724 nbytes
= strlen (packet
) / 2;
2725 varname
= xmalloc (nbytes
+ 1);
2726 nbytes
= unhexify (varname
, packet
, nbytes
);
2727 varname
[nbytes
] = '\0';
2729 tsv
= create_trace_state_variable (num
, 1);
2730 tsv
->initial_value
= (LONGEST
) val
;
2731 tsv
->name
= varname
;
2733 set_trace_state_variable_value (num
, (LONGEST
) val
);
2739 cmd_qtenable_disable (char *own_buf
, int enable
)
2741 char *packet
= own_buf
;
2743 struct tracepoint
*tp
;
2745 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2746 packet
= unpack_varlen_hex (packet
, &num
);
2747 ++packet
; /* skip a colon */
2748 packet
= unpack_varlen_hex (packet
, &addr
);
2750 tp
= find_tracepoint (num
, addr
);
2754 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2756 trace_debug ("Tracepoint %d at 0x%s is already %s",
2757 (int) num
, paddress (addr
),
2758 enable
? "enabled" : "disabled");
2763 trace_debug ("%s tracepoint %d at 0x%s",
2764 enable
? "Enabling" : "Disabling",
2765 (int) num
, paddress (addr
));
2767 tp
->enabled
= enable
;
2769 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2772 int offset
= offsetof (struct tracepoint
, enabled
);
2773 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2775 ret
= prepare_to_access_memory ();
2778 trace_debug ("Failed to temporarily stop inferior threads");
2779 write_enn (own_buf
);
2783 ret
= write_inferior_integer (obj_addr
, enable
);
2784 done_accessing_memory ();
2788 trace_debug ("Cannot write enabled flag into "
2789 "inferior process memory");
2790 write_enn (own_buf
);
2799 trace_debug ("Tracepoint %d at 0x%s not found",
2800 (int) num
, paddress (addr
));
2801 write_enn (own_buf
);
2806 cmd_qtv (char *own_buf
)
2811 char *packet
= own_buf
;
2813 packet
+= strlen ("qTV:");
2814 unpack_varlen_hex (packet
, &num
);
2816 if (current_traceframe
>= 0)
2818 err
= traceframe_read_tsv ((int) num
, &val
);
2821 strcpy (own_buf
, "U");
2825 /* Only make tsv's be undefined before the first trace run. After a
2826 trace run is over, the user might want to see the last value of
2827 the tsv, and it might not be available in a traceframe. */
2828 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2830 strcpy (own_buf
, "U");
2834 val
= get_trace_state_variable_value (num
);
2836 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2839 /* Clear out the list of readonly regions. */
2842 clear_readonly_regions (void)
2844 struct readonly_region
*roreg
;
2846 while (readonly_regions
)
2848 roreg
= readonly_regions
;
2849 readonly_regions
= readonly_regions
->next
;
2854 /* Parse the collection of address ranges whose contents GDB believes
2855 to be unchanging and so can be read directly from target memory
2856 even while looking at a traceframe. */
2859 cmd_qtro (char *own_buf
)
2861 ULONGEST start
, end
;
2862 struct readonly_region
*roreg
;
2863 char *packet
= own_buf
;
2865 trace_debug ("Want to mark readonly regions");
2867 clear_readonly_regions ();
2869 packet
+= strlen ("QTro");
2871 while (*packet
== ':')
2873 ++packet
; /* skip a colon */
2874 packet
= unpack_varlen_hex (packet
, &start
);
2875 ++packet
; /* skip a comma */
2876 packet
= unpack_varlen_hex (packet
, &end
);
2877 roreg
= xmalloc (sizeof (struct readonly_region
));
2878 roreg
->start
= start
;
2880 roreg
->next
= readonly_regions
;
2881 readonly_regions
= roreg
;
2882 trace_debug ("Added readonly region from 0x%s to 0x%s",
2883 paddress (roreg
->start
), paddress (roreg
->end
));
2889 /* Test to see if the given range is in our list of readonly ranges.
2890 We only test for being entirely within a range, GDB is not going to
2891 send a single memory packet that spans multiple regions. */
2894 in_readonly_region (CORE_ADDR addr
, ULONGEST length
)
2896 struct readonly_region
*roreg
;
2898 for (roreg
= readonly_regions
; roreg
; roreg
= roreg
->next
)
2899 if (roreg
->start
<= addr
&& (addr
+ length
- 1) <= roreg
->end
)
2905 /* The maximum size of a jump pad entry. */
2906 static const int max_jump_pad_size
= 0x100;
2908 static CORE_ADDR gdb_jump_pad_head
;
2910 /* Return the address of the next free jump space. */
2913 get_jump_space_head (void)
2915 if (gdb_jump_pad_head
== 0)
2917 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2918 &gdb_jump_pad_head
))
2919 fatal ("error extracting jump_pad_buffer");
2922 return gdb_jump_pad_head
;
2925 /* Reserve USED bytes from the jump space. */
2928 claim_jump_space (ULONGEST used
)
2930 trace_debug ("claim_jump_space reserves %s bytes at %s",
2931 pulongest (used
), paddress (gdb_jump_pad_head
));
2932 gdb_jump_pad_head
+= used
;
2935 static CORE_ADDR trampoline_buffer_head
= 0;
2936 static CORE_ADDR trampoline_buffer_tail
;
2938 /* Reserve USED bytes from the trampoline buffer and return the
2939 address of the start of the reserved space in TRAMPOLINE. Returns
2940 non-zero if the space is successfully claimed. */
2943 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2945 if (!trampoline_buffer_head
)
2947 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2948 &trampoline_buffer_tail
))
2950 fatal ("error extracting trampoline_buffer");
2954 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2955 &trampoline_buffer_head
))
2957 fatal ("error extracting trampoline_buffer_end");
2962 /* Start claiming space from the top of the trampoline space. If
2963 the space is located at the bottom of the virtual address space,
2964 this reduces the possibility that corruption will occur if a null
2965 pointer is used to write to memory. */
2966 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2968 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2973 trampoline_buffer_head
-= used
;
2975 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2976 pulongest (used
), paddress (trampoline_buffer_head
));
2978 *trampoline
= trampoline_buffer_head
;
2982 /* Returns non-zero if there is space allocated for use in trampolines
2983 for fast tracepoints. */
2986 have_fast_tracepoint_trampoline_buffer (char *buf
)
2988 CORE_ADDR trampoline_end
, errbuf
;
2990 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2993 fatal ("error extracting trampoline_buffer_end");
3000 strcpy (buf
, "was claiming");
3001 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3004 fatal ("error extracting errbuf");
3008 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3011 return trampoline_end
!= 0;
3014 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3015 the command fails, or 0 otherwise. If the command ran
3016 successfully, but probing the marker failed, ERROUT will be filled
3017 with the error to reply to GDB, and -1 is also returned. This
3018 allows directly passing IPA errors to GDB. */
3021 probe_marker_at (CORE_ADDR address
, char *errout
)
3023 char cmd
[IPA_CMD_BUF_SIZE
];
3026 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3027 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3033 strcpy (errout
, cmd
);
3042 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3044 to
->jump_pad
= from
->jump_pad
;
3045 to
->jump_pad_end
= from
->jump_pad_end
;
3046 to
->trampoline
= from
->trampoline
;
3047 to
->trampoline_end
= from
->trampoline_end
;
3048 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3049 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3050 to
->handle
= from
->handle
;
3052 gdb_assert (from
->handle
);
3053 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3056 #define MAX_JUMP_SIZE 20
3058 /* Install fast tracepoint. Return 0 if successful, otherwise return
3062 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3064 CORE_ADDR jentry
, jump_entry
;
3065 CORE_ADDR trampoline
;
3066 ULONGEST trampoline_size
;
3068 /* The jump to the jump pad of the last fast tracepoint
3070 unsigned char fjump
[MAX_JUMP_SIZE
];
3071 ULONGEST fjump_size
;
3073 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3075 trace_debug ("Requested a fast tracepoint on an instruction "
3076 "that is of less than the minimum length.");
3080 jentry
= jump_entry
= get_jump_space_head ();
3083 trampoline_size
= 0;
3085 /* Install the jump pad. */
3086 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3088 ipa_sym_addrs
.addr_gdb_collect
,
3089 ipa_sym_addrs
.addr_collecting
,
3092 &trampoline
, &trampoline_size
,
3094 &tpoint
->adjusted_insn_addr
,
3095 &tpoint
->adjusted_insn_addr_end
,
3102 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3105 if (tpoint
->handle
!= NULL
)
3107 tpoint
->jump_pad
= jump_entry
;
3108 tpoint
->jump_pad_end
= jentry
;
3109 tpoint
->trampoline
= trampoline
;
3110 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3112 /* Pad to 8-byte alignment. */
3113 jentry
= ((jentry
+ 7) & ~0x7);
3114 claim_jump_space (jentry
- jump_entry
);
3121 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3124 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3126 tpoint
->handle
= NULL
;
3129 if (tpoint
->type
== trap_tracepoint
)
3131 /* Tracepoints are installed as memory breakpoints. Just go
3132 ahead and install the trap. The breakpoints module
3133 handles duplicated breakpoints, and the memory read
3134 routine handles un-patching traps from memory reads. */
3135 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3136 tracepoint_handler
);
3138 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3140 if (!agent_loaded_p ())
3142 trace_debug ("Requested a %s tracepoint, but fast "
3143 "tracepoints aren't supported.",
3144 tpoint
->type
== static_tracepoint
? "static" : "fast");
3145 write_e_ipa_not_loaded (own_buf
);
3148 if (tpoint
->type
== static_tracepoint
3149 && !in_process_agent_supports_ust ())
3151 trace_debug ("Requested a static tracepoint, but static "
3152 "tracepoints are not supported.");
3153 write_e_ust_not_loaded (own_buf
);
3157 if (tpoint
->type
== fast_tracepoint
)
3158 install_fast_tracepoint (tpoint
, own_buf
);
3161 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3162 tpoint
->handle
= (void *) -1;
3167 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3169 if (tpoint
->handle
== NULL
)
3171 if (*own_buf
== '\0')
3172 write_enn (own_buf
);
3178 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3181 cmd_qtstart (char *packet
)
3183 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3184 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3186 trace_debug ("Starting the trace");
3188 /* Pause all threads temporarily while we patch tracepoints. */
3191 /* Get threads out of jump pads. Safe to do here, since this is a
3192 top level command. And, required to do here, since we're
3193 deleting/rewriting jump pads. */
3195 stabilize_threads ();
3197 /* Freeze threads. */
3200 /* Sync the fast tracepoints list in the inferior ftlib. */
3201 if (agent_loaded_p ())
3202 download_trace_state_variables ();
3204 /* No previous fast tpoint yet. */
3205 prev_ftpoint
= NULL
;
3207 /* No previous static tpoint yet. */
3208 prev_stpoint
= NULL
;
3212 /* Start out empty. */
3213 if (agent_loaded_p ())
3214 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, 0);
3216 /* Download and install tracepoints. */
3217 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3219 /* Ensure all the hit counts start at zero. */
3220 tpoint
->hit_count
= 0;
3221 tpoint
->traceframe_usage
= 0;
3223 if (tpoint
->type
== trap_tracepoint
)
3225 /* Tracepoints are installed as memory breakpoints. Just go
3226 ahead and install the trap. The breakpoints module
3227 handles duplicated breakpoints, and the memory read
3228 routine handles un-patching traps from memory reads. */
3229 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3230 tracepoint_handler
);
3232 else if (tpoint
->type
== fast_tracepoint
3233 || tpoint
->type
== static_tracepoint
)
3235 if (maybe_write_ipa_not_loaded (packet
))
3237 trace_debug ("Requested a %s tracepoint, but fast "
3238 "tracepoints aren't supported.",
3239 tpoint
->type
== static_tracepoint
3240 ? "static" : "fast");
3244 if (tpoint
->type
== fast_tracepoint
)
3247 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3249 if (prev_ftpoint
!= NULL
3250 && prev_ftpoint
->address
== tpoint
->address
)
3253 tracepoint_send_agent (tpoint
);
3255 download_tracepoint_1 (tpoint
);
3257 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3261 /* Tracepoint is installed successfully? */
3264 /* Download and install fast tracepoint by agent. */
3266 installed
= !tracepoint_send_agent (tpoint
);
3269 download_tracepoint_1 (tpoint
);
3270 installed
= !install_fast_tracepoint (tpoint
, packet
);
3274 prev_ftpoint
= tpoint
;
3279 if (!in_process_agent_supports_ust ())
3281 trace_debug ("Requested a static tracepoint, but static "
3282 "tracepoints are not supported.");
3286 download_tracepoint_1 (tpoint
);
3287 /* Can only probe a given marker once. */
3288 if (prev_stpoint
!= NULL
3289 && prev_stpoint
->address
== tpoint
->address
)
3290 tpoint
->handle
= (void *) -1;
3293 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3295 tpoint
->handle
= (void *) -1;
3297 /* So that we can handle multiple static tracepoints
3298 at the same address easily. */
3299 prev_stpoint
= tpoint
;
3305 tpptr
= tpoint
->obj_addr_on_target
;
3307 if (tpoint
== tracepoints
)
3308 /* First object in list, set the head pointer in the
3310 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3312 write_inferior_data_ptr (prev_tpptr
+ offsetof (struct tracepoint
,
3317 /* Any failure in the inner loop is sufficient cause to give
3319 if (tpoint
->handle
== NULL
)
3323 /* Any error in tracepoint insertion is unacceptable; better to
3324 address the problem now, than end up with a useless or misleading
3328 clear_installed_tracepoints ();
3329 if (*packet
== '\0')
3335 stopping_tracepoint
= NULL
;
3336 trace_buffer_is_full
= 0;
3337 expr_eval_result
= expr_eval_no_error
;
3338 error_tracepoint
= NULL
;
3339 tracing_start_time
= get_timestamp ();
3341 /* Tracing is now active, hits will now start being logged. */
3344 if (agent_loaded_p ())
3346 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3347 fatal ("Error setting tracing variable in lib");
3349 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3351 fatal ("Error clearing stopping_tracepoint variable in lib");
3353 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3354 fatal ("Error clearing trace_buffer_is_full variable in lib");
3356 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3357 stop_tracing_handler
);
3358 if (stop_tracing_bkpt
== NULL
)
3359 error ("Error setting stop_tracing breakpoint");
3361 flush_trace_buffer_bkpt
3362 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3363 flush_trace_buffer_handler
);
3364 if (flush_trace_buffer_bkpt
== NULL
)
3365 error ("Error setting flush_trace_buffer breakpoint");
3373 /* End a tracing run, filling in a stop reason to report back to GDB,
3374 and removing the tracepoints from the code. */
3381 trace_debug ("Tracing is already off, ignoring");
3385 trace_debug ("Stopping the trace");
3387 /* Pause all threads before removing fast jumps from memory,
3388 breakpoints, and touching IPA state variables (inferior memory).
3389 Some thread may hit the internal tracing breakpoints, or be
3390 collecting this moment, but that's ok, we don't release the
3391 tpoint object's memory or the jump pads here (we only do that
3392 when we're sure we can move all threads out of the jump pads).
3393 We can't now, since we may be getting here due to the inferior
3394 agent calling us. */
3396 /* Since we're removing breakpoints, cancel breakpoint hits,
3397 possibly related to the breakpoints we're about to delete. */
3398 cancel_breakpoints ();
3400 /* Stop logging. Tracepoints can still be hit, but they will not be
3403 if (agent_loaded_p ())
3405 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3406 fatal ("Error clearing tracing variable in lib");
3409 tracing_stop_time
= get_timestamp ();
3410 tracing_stop_reason
= "t???";
3411 tracing_stop_tpnum
= 0;
3412 if (stopping_tracepoint
)
3414 trace_debug ("Stopping the trace because "
3415 "tracepoint %d was hit %" PRIu64
" times",
3416 stopping_tracepoint
->number
,
3417 stopping_tracepoint
->pass_count
);
3418 tracing_stop_reason
= "tpasscount";
3419 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3421 else if (trace_buffer_is_full
)
3423 trace_debug ("Stopping the trace because the trace buffer is full");
3424 tracing_stop_reason
= "tfull";
3426 else if (expr_eval_result
!= expr_eval_no_error
)
3428 trace_debug ("Stopping the trace because of an expression eval error");
3429 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3430 tracing_stop_tpnum
= error_tracepoint
->number
;
3432 #ifndef IN_PROCESS_AGENT
3433 else if (!gdb_connected ())
3435 trace_debug ("Stopping the trace because GDB disconnected");
3436 tracing_stop_reason
= "tdisconnected";
3441 trace_debug ("Stopping the trace because of a tstop command");
3442 tracing_stop_reason
= "tstop";
3445 stopping_tracepoint
= NULL
;
3446 error_tracepoint
= NULL
;
3448 /* Clear out the tracepoints. */
3449 clear_installed_tracepoints ();
3451 if (agent_loaded_p ())
3453 /* Pull in fast tracepoint trace frames from the inferior lib
3454 buffer into our buffer, even if our buffer is already full,
3455 because we want to present the full number of created frames
3456 in addition to what fit in the trace buffer. */
3457 upload_fast_traceframes ();
3460 if (stop_tracing_bkpt
!= NULL
)
3462 delete_breakpoint (stop_tracing_bkpt
);
3463 stop_tracing_bkpt
= NULL
;
3466 if (flush_trace_buffer_bkpt
!= NULL
)
3468 delete_breakpoint (flush_trace_buffer_bkpt
);
3469 flush_trace_buffer_bkpt
= NULL
;
3476 stop_tracing_handler (CORE_ADDR addr
)
3478 trace_debug ("lib hit stop_tracing");
3480 /* Don't actually handle it here. When we stop tracing we remove
3481 breakpoints from the inferior, and that is not allowed in a
3482 breakpoint handler (as the caller is walking the breakpoint
3488 flush_trace_buffer_handler (CORE_ADDR addr
)
3490 trace_debug ("lib hit flush_trace_buffer");
3495 cmd_qtstop (char *packet
)
3502 cmd_qtdisconnected (char *own_buf
)
3505 char *packet
= own_buf
;
3507 packet
+= strlen ("QTDisconnected:");
3509 unpack_varlen_hex (packet
, &setting
);
3513 disconnected_tracing
= setting
;
3517 cmd_qtframe (char *own_buf
)
3519 ULONGEST frame
, pc
, lo
, hi
, num
;
3521 struct traceframe
*tframe
;
3522 char *packet
= own_buf
;
3524 packet
+= strlen ("QTFrame:");
3526 if (strncmp (packet
, "pc:", strlen ("pc:")) == 0)
3528 packet
+= strlen ("pc:");
3529 unpack_varlen_hex (packet
, &pc
);
3530 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3531 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3533 else if (strncmp (packet
, "range:", strlen ("range:")) == 0)
3535 packet
+= strlen ("range:");
3536 packet
= unpack_varlen_hex (packet
, &lo
);
3538 unpack_varlen_hex (packet
, &hi
);
3539 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3540 paddress (lo
), paddress (hi
));
3541 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3543 else if (strncmp (packet
, "outside:", strlen ("outside:")) == 0)
3545 packet
+= strlen ("outside:");
3546 packet
= unpack_varlen_hex (packet
, &lo
);
3548 unpack_varlen_hex (packet
, &hi
);
3549 trace_debug ("Want to find next traceframe "
3550 "outside the range 0x%s to 0x%s",
3551 paddress (lo
), paddress (hi
));
3552 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3554 else if (strncmp (packet
, "tdp:", strlen ("tdp:")) == 0)
3556 packet
+= strlen ("tdp:");
3557 unpack_varlen_hex (packet
, &num
);
3559 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3560 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3564 unpack_varlen_hex (packet
, &frame
);
3565 tfnum
= (int) frame
;
3568 trace_debug ("Want to stop looking at traceframes");
3569 current_traceframe
= -1;
3573 trace_debug ("Want to look at traceframe %d", tfnum
);
3574 tframe
= find_traceframe (tfnum
);
3579 current_traceframe
= tfnum
;
3580 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3583 sprintf (own_buf
, "F-1");
3587 cmd_qtstatus (char *packet
)
3589 char *stop_reason_rsp
= NULL
;
3590 char *buf1
, *buf2
, *buf3
, *str
;
3593 /* Translate the plain text of the notes back into hex for
3596 str
= (tracing_user_name
? tracing_user_name
: "");
3597 slen
= strlen (str
);
3598 buf1
= (char *) alloca (slen
* 2 + 1);
3599 hexify (buf1
, str
, slen
);
3601 str
= (tracing_notes
? tracing_notes
: "");
3602 slen
= strlen (str
);
3603 buf2
= (char *) alloca (slen
* 2 + 1);
3604 hexify (buf2
, str
, slen
);
3606 str
= (tracing_stop_note
? tracing_stop_note
: "");
3607 slen
= strlen (str
);
3608 buf3
= (char *) alloca (slen
* 2 + 1);
3609 hexify (buf3
, str
, slen
);
3611 trace_debug ("Returning trace status as %d, stop reason %s",
3612 tracing
, tracing_stop_reason
);
3614 if (agent_loaded_p ())
3618 upload_fast_traceframes ();
3623 stop_reason_rsp
= (char *) tracing_stop_reason
;
3625 /* The user visible error string in terror needs to be hex encoded.
3626 We leave it as plain string in `tracing_stop_reason' to ease
3628 if (strncmp (stop_reason_rsp
, "terror:", strlen ("terror:")) == 0)
3630 const char *result_name
;
3634 result_name
= stop_reason_rsp
+ strlen ("terror:");
3635 hexstr_len
= strlen (result_name
) * 2;
3636 p
= stop_reason_rsp
= alloca (strlen ("terror:") + hexstr_len
+ 1);
3637 strcpy (p
, "terror:");
3639 convert_int_to_ascii ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3642 /* If this was a forced stop, include any stop note that was supplied. */
3643 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3645 stop_reason_rsp
= alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3646 strcpy (stop_reason_rsp
, "tstop:");
3647 strcat (stop_reason_rsp
, buf3
);
3653 "tframes:%x;tcreated:%x;"
3654 "tfree:%x;tsize:%s;"
3657 "starttime:%s;stoptime:%s;"
3658 "username:%s:;notes:%s:",
3660 stop_reason_rsp
, tracing_stop_tpnum
,
3661 traceframe_count
, traceframes_created
,
3662 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3663 circular_trace_buffer
,
3664 disconnected_tracing
,
3665 plongest (tracing_start_time
), plongest (tracing_stop_time
),
3670 cmd_qtp (char *own_buf
)
3673 struct tracepoint
*tpoint
;
3674 char *packet
= own_buf
;
3676 packet
+= strlen ("qTP:");
3678 packet
= unpack_varlen_hex (packet
, &num
);
3679 ++packet
; /* skip a colon */
3680 packet
= unpack_varlen_hex (packet
, &addr
);
3682 /* See if we already have this tracepoint. */
3683 tpoint
= find_tracepoint (num
, addr
);
3687 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3688 (int) num
, paddress (addr
));
3689 write_enn (own_buf
);
3693 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3694 tpoint
->traceframe_usage
);
3697 /* State variables to help return all the tracepoint bits. */
3698 static struct tracepoint
*cur_tpoint
;
3699 static int cur_action
;
3700 static int cur_step_action
;
3701 static struct source_string
*cur_source_string
;
3702 static struct trace_state_variable
*cur_tsv
;
3704 /* Compose a response that is an imitation of the syntax by which the
3705 tracepoint was originally downloaded. */
3708 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3712 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3713 paddress (tpoint
->address
),
3714 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3715 tpoint
->pass_count
);
3716 if (tpoint
->type
== fast_tracepoint
)
3717 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3718 else if (tpoint
->type
== static_tracepoint
)
3719 sprintf (packet
+ strlen (packet
), ":S");
3723 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3724 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3725 tpoint
->cond
->length
, buf
);
3730 /* Compose a response that is an imitation of the syntax by which the
3731 tracepoint action was originally downloaded (with the difference
3732 that due to the way we store the actions, this will output a packet
3733 per action, while GDB could have combined more than one action
3737 response_action (char *packet
, struct tracepoint
*tpoint
,
3738 char *taction
, int step
)
3740 sprintf (packet
, "%c%x:%s:%s",
3741 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3745 /* Compose a response that is an imitation of the syntax by which the
3746 tracepoint source piece was originally downloaded. */
3749 response_source (char *packet
,
3750 struct tracepoint
*tpoint
, struct source_string
*src
)
3755 len
= strlen (src
->str
);
3756 buf
= alloca (len
* 2 + 1);
3757 convert_int_to_ascii ((gdb_byte
*) src
->str
, buf
, len
);
3759 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3760 tpoint
->number
, paddress (tpoint
->address
),
3761 src
->type
, 0, len
, buf
);
3764 /* Return the first piece of tracepoint definition, and initialize the
3765 state machine that will iterate through all the tracepoint
3769 cmd_qtfp (char *packet
)
3771 trace_debug ("Returning first tracepoint definition piece");
3773 cur_tpoint
= tracepoints
;
3774 cur_action
= cur_step_action
= -1;
3775 cur_source_string
= NULL
;
3778 response_tracepoint (packet
, cur_tpoint
);
3780 strcpy (packet
, "l");
3783 /* Return additional pieces of tracepoint definition. Each action and
3784 stepping action must go into its own packet, because of packet size
3785 limits, and so we use state variables to deliver one piece at a
3789 cmd_qtsp (char *packet
)
3791 trace_debug ("Returning subsequent tracepoint definition piece");
3795 /* This case would normally never occur, but be prepared for
3797 strcpy (packet
, "l");
3799 else if (cur_action
< cur_tpoint
->numactions
- 1)
3802 response_action (packet
, cur_tpoint
,
3803 cur_tpoint
->actions_str
[cur_action
], 0);
3805 else if (cur_step_action
< cur_tpoint
->num_step_actions
- 1)
3808 response_action (packet
, cur_tpoint
,
3809 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3811 else if ((cur_source_string
3812 ? cur_source_string
->next
3813 : cur_tpoint
->source_strings
))
3815 if (cur_source_string
)
3816 cur_source_string
= cur_source_string
->next
;
3818 cur_source_string
= cur_tpoint
->source_strings
;
3819 response_source (packet
, cur_tpoint
, cur_source_string
);
3823 cur_tpoint
= cur_tpoint
->next
;
3824 cur_action
= cur_step_action
= -1;
3825 cur_source_string
= NULL
;
3827 response_tracepoint (packet
, cur_tpoint
);
3829 strcpy (packet
, "l");
3833 /* Compose a response that is an imitation of the syntax by which the
3834 trace state variable was originally downloaded. */
3837 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3839 char *buf
= (char *) "";
3844 namelen
= strlen (tsv
->name
);
3845 buf
= alloca (namelen
* 2 + 1);
3846 convert_int_to_ascii ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3849 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3850 tsv
->getter
? 1 : 0, buf
);
3853 /* Return the first trace state variable definition, and initialize
3854 the state machine that will iterate through all the tsv bits. */
3857 cmd_qtfv (char *packet
)
3859 trace_debug ("Returning first trace state variable definition");
3861 cur_tsv
= trace_state_variables
;
3864 response_tsv (packet
, cur_tsv
);
3866 strcpy (packet
, "l");
3869 /* Return additional trace state variable definitions. */
3872 cmd_qtsv (char *packet
)
3874 trace_debug ("Returning additional trace state variable definition");
3878 cur_tsv
= cur_tsv
->next
;
3880 response_tsv (packet
, cur_tsv
);
3882 strcpy (packet
, "l");
3885 strcpy (packet
, "l");
3888 /* Return the first static tracepoint marker, and initialize the state
3889 machine that will iterate through all the static tracepoints
3893 cmd_qtfstm (char *packet
)
3895 if (!maybe_write_ipa_ust_not_loaded (packet
))
3896 run_inferior_command (packet
, strlen (packet
) + 1);
3899 /* Return additional static tracepoints markers. */
3902 cmd_qtsstm (char *packet
)
3904 if (!maybe_write_ipa_ust_not_loaded (packet
))
3905 run_inferior_command (packet
, strlen (packet
) + 1);
3908 /* Return the definition of the static tracepoint at a given address.
3909 Result packet is the same as qTsST's. */
3912 cmd_qtstmat (char *packet
)
3914 if (!maybe_write_ipa_ust_not_loaded (packet
))
3915 run_inferior_command (packet
, strlen (packet
) + 1);
3918 /* Sent the agent a command to close it. */
3921 gdb_agent_about_to_close (int pid
)
3923 char buf
[IPA_CMD_BUF_SIZE
];
3925 if (!maybe_write_ipa_not_loaded (buf
))
3927 struct thread_info
*save_inferior
;
3928 struct inferior_list_entry
*inf
= all_threads
.head
;
3930 save_inferior
= current_inferior
;
3932 /* Find a certain thread which belongs to process PID. */
3935 if (ptid_get_pid (inf
->id
) == pid
)
3940 current_inferior
= (struct thread_info
*) inf
;
3942 strcpy (buf
, "close");
3944 run_inferior_command (buf
, strlen (buf
) + 1);
3946 current_inferior
= save_inferior
;
3950 /* Return the minimum instruction size needed for fast tracepoints as a
3951 hexadecimal number. */
3954 cmd_qtminftpilen (char *packet
)
3956 if (current_inferior
== NULL
)
3958 /* Indicate that the minimum length is currently unknown. */
3959 strcpy (packet
, "0");
3963 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
3966 /* Respond to qTBuffer packet with a block of raw data from the trace
3967 buffer. GDB may ask for a lot, but we are allowed to reply with
3968 only as much as will fit within packet limits or whatever. */
3971 cmd_qtbuffer (char *own_buf
)
3973 ULONGEST offset
, num
, tot
;
3975 char *packet
= own_buf
;
3977 packet
+= strlen ("qTBuffer:");
3979 packet
= unpack_varlen_hex (packet
, &offset
);
3980 ++packet
; /* skip a comma */
3981 unpack_varlen_hex (packet
, &num
);
3983 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
3984 (int) num
, pulongest (offset
));
3986 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
3988 /* If we're right at the end, reply specially that we're done. */
3991 strcpy (own_buf
, "l");
3995 /* Object to any other out-of-bounds request. */
3998 write_enn (own_buf
);
4002 /* Compute the pointer corresponding to the given offset, accounting
4004 tbp
= trace_buffer_start
+ offset
;
4005 if (tbp
>= trace_buffer_wrap
)
4006 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
4008 /* Trim to the remaining bytes if we're close to the end. */
4009 if (num
> tot
- offset
)
4012 /* Trim to available packet size. */
4013 if (num
>= (PBUFSIZ
- 16) / 2 )
4014 num
= (PBUFSIZ
- 16) / 2;
4016 convert_int_to_ascii (tbp
, own_buf
, num
);
4017 own_buf
[num
] = '\0';
4021 cmd_bigqtbuffer_circular (char *own_buf
)
4024 char *packet
= own_buf
;
4026 packet
+= strlen ("QTBuffer:circular:");
4028 unpack_varlen_hex (packet
, &val
);
4029 circular_trace_buffer
= val
;
4030 trace_debug ("Trace buffer is now %s",
4031 circular_trace_buffer
? "circular" : "linear");
4036 cmd_qtnotes (char *own_buf
)
4039 char *saved
, *user
, *notes
, *stopnote
;
4040 char *packet
= own_buf
;
4042 packet
+= strlen ("QTNotes:");
4046 if (strncmp ("user:", packet
, strlen ("user:")) == 0)
4048 packet
+= strlen ("user:");
4050 packet
= strchr (packet
, ';');
4051 nbytes
= (packet
- saved
) / 2;
4052 user
= xmalloc (nbytes
+ 1);
4053 nbytes
= unhexify (user
, saved
, nbytes
);
4054 user
[nbytes
] = '\0';
4055 ++packet
; /* skip the semicolon */
4056 trace_debug ("User is '%s'", user
);
4057 tracing_user_name
= user
;
4059 else if (strncmp ("notes:", packet
, strlen ("notes:")) == 0)
4061 packet
+= strlen ("notes:");
4063 packet
= strchr (packet
, ';');
4064 nbytes
= (packet
- saved
) / 2;
4065 notes
= xmalloc (nbytes
+ 1);
4066 nbytes
= unhexify (notes
, saved
, nbytes
);
4067 notes
[nbytes
] = '\0';
4068 ++packet
; /* skip the semicolon */
4069 trace_debug ("Notes is '%s'", notes
);
4070 tracing_notes
= notes
;
4072 else if (strncmp ("tstop:", packet
, strlen ("tstop:")) == 0)
4074 packet
+= strlen ("tstop:");
4076 packet
= strchr (packet
, ';');
4077 nbytes
= (packet
- saved
) / 2;
4078 stopnote
= xmalloc (nbytes
+ 1);
4079 nbytes
= unhexify (stopnote
, saved
, nbytes
);
4080 stopnote
[nbytes
] = '\0';
4081 ++packet
; /* skip the semicolon */
4082 trace_debug ("tstop note is '%s'", stopnote
);
4083 tracing_stop_note
= stopnote
;
4093 handle_tracepoint_general_set (char *packet
)
4095 if (strcmp ("QTinit", packet
) == 0)
4097 cmd_qtinit (packet
);
4100 else if (strncmp ("QTDP:", packet
, strlen ("QTDP:")) == 0)
4105 else if (strncmp ("QTDPsrc:", packet
, strlen ("QTDPsrc:")) == 0)
4107 cmd_qtdpsrc (packet
);
4110 else if (strncmp ("QTEnable:", packet
, strlen ("QTEnable:")) == 0)
4112 cmd_qtenable_disable (packet
, 1);
4115 else if (strncmp ("QTDisable:", packet
, strlen ("QTDisable:")) == 0)
4117 cmd_qtenable_disable (packet
, 0);
4120 else if (strncmp ("QTDV:", packet
, strlen ("QTDV:")) == 0)
4125 else if (strncmp ("QTro:", packet
, strlen ("QTro:")) == 0)
4130 else if (strcmp ("QTStart", packet
) == 0)
4132 cmd_qtstart (packet
);
4135 else if (strcmp ("QTStop", packet
) == 0)
4137 cmd_qtstop (packet
);
4140 else if (strncmp ("QTDisconnected:", packet
,
4141 strlen ("QTDisconnected:")) == 0)
4143 cmd_qtdisconnected (packet
);
4146 else if (strncmp ("QTFrame:", packet
, strlen ("QTFrame:")) == 0)
4148 cmd_qtframe (packet
);
4151 else if (strncmp ("QTBuffer:circular:", packet
, strlen ("QTBuffer:circular:")) == 0)
4153 cmd_bigqtbuffer_circular (packet
);
4156 else if (strncmp ("QTNotes:", packet
, strlen ("QTNotes:")) == 0)
4158 cmd_qtnotes (packet
);
4166 handle_tracepoint_query (char *packet
)
4168 if (strcmp ("qTStatus", packet
) == 0)
4170 cmd_qtstatus (packet
);
4173 else if (strncmp ("qTP:", packet
, strlen ("qTP:")) == 0)
4178 else if (strcmp ("qTfP", packet
) == 0)
4183 else if (strcmp ("qTsP", packet
) == 0)
4188 else if (strcmp ("qTfV", packet
) == 0)
4193 else if (strcmp ("qTsV", packet
) == 0)
4198 else if (strncmp ("qTV:", packet
, strlen ("qTV:")) == 0)
4203 else if (strncmp ("qTBuffer:", packet
, strlen ("qTBuffer:")) == 0)
4205 cmd_qtbuffer (packet
);
4208 else if (strcmp ("qTfSTM", packet
) == 0)
4210 cmd_qtfstm (packet
);
4213 else if (strcmp ("qTsSTM", packet
) == 0)
4215 cmd_qtsstm (packet
);
4218 else if (strncmp ("qTSTMat:", packet
, strlen ("qTSTMat:")) == 0)
4220 cmd_qtstmat (packet
);
4223 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4225 cmd_qtminftpilen (packet
);
4233 #ifndef IN_PROCESS_AGENT
4235 /* Call this when thread TINFO has hit the tracepoint defined by
4236 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4237 action. This adds a while-stepping collecting state item to the
4238 threads' collecting state list, so that we can keep track of
4239 multiple simultaneous while-stepping actions being collected by the
4240 same thread. This can happen in cases like:
4242 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4244 ff0003 INSN3 <-- TP2, collect $regs
4245 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4248 Notice that when instruction INSN5 is reached, the while-stepping
4249 actions of both TP1 and TP3 are still being collected, and that TP2
4250 had been collected meanwhile. The whole range of ff0001-ff0005
4251 should be single-stepped, due to at least TP1's while-stepping
4252 action covering the whole range. */
4255 add_while_stepping_state (struct thread_info
*tinfo
,
4256 int tp_number
, CORE_ADDR tp_address
)
4258 struct wstep_state
*wstep
;
4260 wstep
= xmalloc (sizeof (*wstep
));
4261 wstep
->next
= tinfo
->while_stepping
;
4263 wstep
->tp_number
= tp_number
;
4264 wstep
->tp_address
= tp_address
;
4265 wstep
->current_step
= 0;
4267 tinfo
->while_stepping
= wstep
;
4270 /* Release the while-stepping collecting state WSTEP. */
4273 release_while_stepping_state (struct wstep_state
*wstep
)
4278 /* Release all while-stepping collecting states currently associated
4279 with thread TINFO. */
4282 release_while_stepping_state_list (struct thread_info
*tinfo
)
4284 struct wstep_state
*head
;
4286 while (tinfo
->while_stepping
)
4288 head
= tinfo
->while_stepping
;
4289 tinfo
->while_stepping
= head
->next
;
4290 release_while_stepping_state (head
);
4294 /* If TINFO was handling a 'while-stepping' action, the step has
4295 finished, so collect any step data needed, and check if any more
4296 steps are required. Return true if the thread was indeed
4297 collecting tracepoint data, false otherwise. */
4300 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4302 struct tracepoint
*tpoint
;
4303 struct wstep_state
*wstep
;
4304 struct wstep_state
**wstep_link
;
4305 struct trap_tracepoint_ctx ctx
;
4307 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4309 if (agent_loaded_p ())
4310 upload_fast_traceframes ();
4312 /* Check if we were indeed collecting data for one of more
4313 tracepoints with a 'while-stepping' count. */
4314 if (tinfo
->while_stepping
== NULL
)
4319 /* We're not even tracing anymore. Stop this thread from
4321 release_while_stepping_state_list (tinfo
);
4323 /* The thread had stopped due to a single-step request indeed
4324 explained by a tracepoint. */
4328 wstep
= tinfo
->while_stepping
;
4329 wstep_link
= &tinfo
->while_stepping
;
4331 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4332 target_pid_to_str (tinfo
->entry
.id
),
4333 wstep
->tp_number
, paddress (wstep
->tp_address
));
4335 ctx
.base
.type
= trap_tracepoint
;
4336 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4338 while (wstep
!= NULL
)
4340 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4343 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4344 wstep
->tp_number
, paddress (wstep
->tp_address
),
4345 target_pid_to_str (tinfo
->entry
.id
));
4348 *wstep_link
= wstep
->next
;
4349 release_while_stepping_state (wstep
);
4350 wstep
= *wstep_link
;
4354 /* We've just finished one step. */
4355 ++wstep
->current_step
;
4358 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4359 stop_pc
, tpoint
, wstep
->current_step
);
4361 if (wstep
->current_step
>= tpoint
->step_count
)
4363 /* The requested numbers of steps have occurred. */
4364 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4365 target_pid_to_str (tinfo
->entry
.id
),
4366 wstep
->tp_number
, paddress (wstep
->tp_address
));
4368 /* Unlink the wstep. */
4369 *wstep_link
= wstep
->next
;
4370 release_while_stepping_state (wstep
);
4371 wstep
= *wstep_link
;
4373 /* Only check the hit count now, which ensure that we do all
4374 our stepping before stopping the run. */
4375 if (tpoint
->pass_count
> 0
4376 && tpoint
->hit_count
>= tpoint
->pass_count
4377 && stopping_tracepoint
== NULL
)
4378 stopping_tracepoint
= tpoint
;
4382 /* Keep single-stepping until the requested numbers of steps
4384 wstep_link
= &wstep
->next
;
4385 wstep
= *wstep_link
;
4388 if (stopping_tracepoint
4389 || trace_buffer_is_full
4390 || expr_eval_result
!= expr_eval_no_error
)
4400 /* Handle any internal tracing control breakpoint hits. That means,
4401 pull traceframes from the IPA to our buffer, and syncing both
4402 tracing agents when the IPA's tracing stops for some reason. */
4405 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4407 /* Pull in fast tracepoint trace frames from the inferior in-process
4408 agent's buffer into our buffer. */
4410 if (!agent_loaded_p ())
4413 upload_fast_traceframes ();
4415 /* Check if the in-process agent had decided we should stop
4417 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4419 int ipa_trace_buffer_is_full
;
4420 CORE_ADDR ipa_stopping_tracepoint
;
4421 int ipa_expr_eval_result
;
4422 CORE_ADDR ipa_error_tracepoint
;
4424 trace_debug ("lib stopped at stop_tracing");
4426 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4427 &ipa_trace_buffer_is_full
);
4429 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4430 &ipa_stopping_tracepoint
);
4431 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4433 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4434 &ipa_error_tracepoint
);
4435 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4437 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4438 &ipa_expr_eval_result
);
4439 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4441 trace_debug ("lib: trace_buffer_is_full: %d, "
4442 "stopping_tracepoint: %s, "
4443 "ipa_expr_eval_result: %d, "
4444 "error_tracepoint: %s, ",
4445 ipa_trace_buffer_is_full
,
4446 paddress (ipa_stopping_tracepoint
),
4447 ipa_expr_eval_result
,
4448 paddress (ipa_error_tracepoint
));
4452 if (ipa_trace_buffer_is_full
)
4453 trace_debug ("lib stopped due to full buffer.");
4454 if (ipa_stopping_tracepoint
)
4455 trace_debug ("lib stopped due to tpoint");
4456 if (ipa_stopping_tracepoint
)
4457 trace_debug ("lib stopped due to error");
4460 if (ipa_stopping_tracepoint
!= 0)
4463 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4465 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4467 expr_eval_result
= ipa_expr_eval_result
;
4469 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4474 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4476 trace_debug ("lib stopped at flush_trace_buffer");
4483 /* Return true if TINFO just hit a tracepoint. Collect data if
4487 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4489 struct tracepoint
*tpoint
;
4491 struct trap_tracepoint_ctx ctx
;
4493 /* Not tracing, don't handle. */
4497 ctx
.base
.type
= trap_tracepoint
;
4498 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4500 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4502 /* Note that we collect fast tracepoints here as well. We'll
4503 step over the fast tracepoint jump later, which avoids the
4504 double collect. However, we don't collect for static
4505 tracepoints here, because UST markers are compiled in program,
4506 and probes will be executed in program. So static tracepoints
4507 are collected there. */
4508 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4509 && tpoint
->type
!= static_tracepoint
)
4511 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4512 target_pid_to_str (tinfo
->entry
.id
),
4513 tpoint
->number
, paddress (tpoint
->address
));
4515 /* Test the condition if present, and collect if true. */
4517 || (condition_true_at_tracepoint
4518 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4519 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4522 if (stopping_tracepoint
4523 || trace_buffer_is_full
4524 || expr_eval_result
!= expr_eval_no_error
)
4528 /* If the tracepoint had a 'while-stepping' action, then set
4529 the thread to collect this tracepoint on the following
4531 else if (tpoint
->step_count
> 0)
4533 add_while_stepping_state (tinfo
,
4534 tpoint
->number
, tpoint
->address
);
4546 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4547 struct ust_marker_data
;
4548 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4549 struct traceframe
*tframe
);
4552 /* Create a trace frame for the hit of the given tracepoint in the
4556 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4557 struct tracepoint
*tpoint
)
4559 struct traceframe
*tframe
;
4562 /* Only count it as a hit when we actually collect data. */
4563 tpoint
->hit_count
++;
4565 /* If we've exceeded a defined pass count, record the event for
4566 later, and finish the collection for this hit. This test is only
4567 for nonstepping tracepoints, stepping tracepoints test at the end
4568 of their while-stepping loop. */
4569 if (tpoint
->pass_count
> 0
4570 && tpoint
->hit_count
>= tpoint
->pass_count
4571 && tpoint
->step_count
== 0
4572 && stopping_tracepoint
== NULL
)
4573 stopping_tracepoint
= tpoint
;
4575 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4576 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4578 tframe
= add_traceframe (tpoint
);
4582 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4584 #ifndef IN_PROCESS_AGENT
4585 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4586 tpoint
->number
, paddress (tpoint
->address
),
4587 tpoint
->actions_str
[acti
]);
4590 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4591 tpoint
->actions
[acti
]);
4594 finish_traceframe (tframe
);
4597 if (tframe
== NULL
&& tracing
)
4598 trace_buffer_is_full
= 1;
4601 #ifndef IN_PROCESS_AGENT
4604 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4606 struct tracepoint
*tpoint
, int current_step
)
4608 struct traceframe
*tframe
;
4611 trace_debug ("Making new step traceframe for "
4612 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4613 tpoint
->number
, paddress (tpoint
->address
),
4614 current_step
, tpoint
->step_count
,
4617 tframe
= add_traceframe (tpoint
);
4621 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4623 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4624 tpoint
->number
, paddress (tpoint
->address
),
4625 tpoint
->step_actions_str
[acti
]);
4627 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4628 tpoint
->step_actions
[acti
]);
4631 finish_traceframe (tframe
);
4634 if (tframe
== NULL
&& tracing
)
4635 trace_buffer_is_full
= 1;
4640 static struct regcache
*
4641 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4643 struct regcache
*regcache
= NULL
;
4645 #ifdef IN_PROCESS_AGENT
4646 if (ctx
->type
== fast_tracepoint
)
4648 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4649 if (!fctx
->regcache_initted
)
4651 fctx
->regcache_initted
= 1;
4652 init_register_cache (&fctx
->regcache
, fctx
->regspace
);
4653 supply_regblock (&fctx
->regcache
, NULL
);
4654 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4656 regcache
= &fctx
->regcache
;
4659 if (ctx
->type
== static_tracepoint
)
4661 struct static_tracepoint_ctx
*sctx
4662 = (struct static_tracepoint_ctx
*) ctx
;
4664 if (!sctx
->regcache_initted
)
4666 sctx
->regcache_initted
= 1;
4667 init_register_cache (&sctx
->regcache
, sctx
->regspace
);
4668 supply_regblock (&sctx
->regcache
, NULL
);
4669 /* Pass down the tracepoint address, because REGS doesn't
4670 include the PC, but we know what it must have been. */
4671 supply_static_tracepoint_registers (&sctx
->regcache
,
4672 (const unsigned char *)
4674 sctx
->tpoint
->address
);
4676 regcache
= &sctx
->regcache
;
4680 if (ctx
->type
== trap_tracepoint
)
4682 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4683 regcache
= tctx
->regcache
;
4687 gdb_assert (regcache
!= NULL
);
4693 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4695 struct tracepoint
*tpoint
,
4696 struct traceframe
*tframe
,
4697 struct tracepoint_action
*taction
)
4699 enum eval_result_type err
;
4701 switch (taction
->type
)
4705 struct collect_memory_action
*maction
;
4706 struct eval_agent_expr_context ax_ctx
;
4708 maction
= (struct collect_memory_action
*) taction
;
4709 ax_ctx
.regcache
= NULL
;
4710 ax_ctx
.tframe
= tframe
;
4711 ax_ctx
.tpoint
= tpoint
;
4713 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4714 pulongest (maction
->len
),
4715 paddress (maction
->addr
), maction
->basereg
);
4716 /* (should use basereg) */
4717 agent_mem_read (&ax_ctx
, NULL
, (CORE_ADDR
) maction
->addr
,
4723 unsigned char *regspace
;
4724 struct regcache tregcache
;
4725 struct regcache
*context_regcache
;
4728 trace_debug ("Want to collect registers");
4730 /* Collect all registers for now. */
4731 regspace
= add_traceframe_block (tframe
, tpoint
,
4732 1 + register_cache_size ());
4733 if (regspace
== NULL
)
4735 trace_debug ("Trace buffer block allocation failed, skipping");
4738 /* Identify a register block. */
4741 context_regcache
= get_context_regcache (ctx
);
4743 /* Wrap the regblock in a register cache (in the stack, we
4744 don't want to malloc here). */
4745 init_register_cache (&tregcache
, regspace
+ 1);
4747 /* Copy the register data to the regblock. */
4748 regcache_cpy (&tregcache
, context_regcache
);
4750 #ifndef IN_PROCESS_AGENT
4751 /* On some platforms, trap-based tracepoints will have the PC
4752 pointing to the next instruction after the trap, but we
4753 don't want the user or GDB trying to guess whether the
4754 saved PC needs adjusting; so always record the adjusted
4755 stop_pc. Note that we can't use tpoint->address instead,
4756 since it will be wrong for while-stepping actions. This
4757 adjustment is a nop for fast tracepoints collected from the
4758 in-process lib (but not if GDBserver is collecting one
4759 preemptively), since the PC had already been adjusted to
4760 contain the tracepoint's address by the jump pad. */
4761 trace_debug ("Storing stop pc (0x%s) in regblock",
4762 paddress (stop_pc
));
4764 /* This changes the regblock, not the thread's
4766 regcache_write_pc (&tregcache
, stop_pc
);
4772 struct eval_expr_action
*eaction
;
4773 struct eval_agent_expr_context ax_ctx
;
4775 eaction
= (struct eval_expr_action
*) taction
;
4776 ax_ctx
.regcache
= get_context_regcache (ctx
);
4777 ax_ctx
.tframe
= tframe
;
4778 ax_ctx
.tpoint
= tpoint
;
4780 trace_debug ("Want to evaluate expression");
4782 err
= gdb_eval_agent_expr (&ax_ctx
, eaction
->expr
, NULL
);
4784 if (err
!= expr_eval_no_error
)
4786 record_tracepoint_error (tpoint
, "action expression", err
);
4793 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4794 trace_debug ("Want to collect static trace data");
4795 collect_ust_data_at_tracepoint (ctx
, tframe
);
4797 trace_debug ("warning: collecting static trace data, "
4798 "but static tracepoints are not supported");
4803 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4809 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4810 struct tracepoint
*tpoint
)
4813 enum eval_result_type err
;
4815 /* Presently, gdbserver doesn't run compiled conditions, only the
4816 IPA does. If the program stops at a fast tracepoint's address
4817 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4818 gdbserver preemptively collect the fast tracepoint. Later, on
4819 resume, gdbserver steps over the fast tracepoint like it steps
4820 over breakpoints, so that the IPA doesn't see that fast
4821 tracepoint. This avoids double collects of fast tracepoints in
4822 that stopping scenario. Having gdbserver itself handle the fast
4823 tracepoint gives the user a consistent view of when fast or trap
4824 tracepoints are collected, compared to an alternative where only
4825 trap tracepoints are collected on stop, and fast tracepoints on
4826 resume. When a fast tracepoint is being processed by gdbserver,
4827 it is always the non-compiled condition expression that is
4829 #ifdef IN_PROCESS_AGENT
4830 if (tpoint
->compiled_cond
)
4831 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (ctx
, &value
);
4835 struct eval_agent_expr_context ax_ctx
;
4837 ax_ctx
.regcache
= get_context_regcache (ctx
);
4838 ax_ctx
.tframe
= NULL
;
4839 ax_ctx
.tpoint
= tpoint
;
4841 err
= gdb_eval_agent_expr (&ax_ctx
, tpoint
->cond
, &value
);
4843 if (err
!= expr_eval_no_error
)
4845 record_tracepoint_error (tpoint
, "condition", err
);
4846 /* The error case must return false. */
4850 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4851 tpoint
->number
, paddress (tpoint
->address
),
4853 return (value
? 1 : 0);
4856 /* Do memory copies for bytecodes. */
4857 /* Do the recording of memory blocks for actions and bytecodes. */
4860 agent_mem_read (struct eval_agent_expr_context
*ctx
,
4861 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4863 unsigned char *mspace
;
4864 ULONGEST remaining
= len
;
4865 unsigned short blocklen
;
4867 /* If a 'to' buffer is specified, use it. */
4870 read_inferior_memory (from
, to
, len
);
4874 /* Otherwise, create a new memory block in the trace buffer. */
4875 while (remaining
> 0)
4879 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4880 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4881 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
4884 /* Identify block as a memory block. */
4887 /* Record address and size. */
4888 memcpy (mspace
, &from
, sizeof (from
));
4889 mspace
+= sizeof (from
);
4890 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4891 mspace
+= sizeof (blocklen
);
4892 /* Record the memory block proper. */
4893 read_inferior_memory (from
, mspace
, blocklen
);
4894 trace_debug ("%d bytes recorded", blocklen
);
4895 remaining
-= blocklen
;
4902 agent_mem_read_string (struct eval_agent_expr_context
*ctx
,
4903 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4905 unsigned char *buf
, *mspace
;
4906 ULONGEST remaining
= len
;
4907 unsigned short blocklen
, i
;
4909 /* To save a bit of space, block lengths are 16-bit, so break large
4910 requests into multiple blocks. Bordering on overkill for strings,
4911 but it could happen that someone specifies a large max length. */
4912 while (remaining
> 0)
4916 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4917 /* We want working space to accumulate nonzero bytes, since
4918 traceframes must have a predecided size (otherwise it gets
4919 harder to wrap correctly for the circular case, etc). */
4920 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
4921 for (i
= 0; i
< blocklen
; ++i
)
4923 /* Read the string one byte at a time, in case the string is
4924 at the end of a valid memory area - we don't want a
4925 correctly-terminated string to engender segvio
4927 read_inferior_memory (from
+ i
, buf
+ i
, 1);
4932 /* Make sure outer loop stops now too. */
4933 remaining
= blocklen
;
4937 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4938 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
4944 /* Identify block as a memory block. */
4947 /* Record address and size. */
4948 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
4949 mspace
+= sizeof (from
);
4950 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
4951 mspace
+= sizeof (blocklen
);
4952 /* Copy the string contents. */
4953 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
4954 remaining
-= blocklen
;
4961 /* Record the value of a trace state variable. */
4964 agent_tsv_read (struct eval_agent_expr_context
*ctx
, int n
)
4966 unsigned char *vspace
;
4969 vspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
,
4970 1 + sizeof (n
) + sizeof (LONGEST
));
4973 /* Identify block as a variable. */
4975 /* Record variable's number and value. */
4976 memcpy (vspace
+ 1, &n
, sizeof (n
));
4977 val
= get_trace_state_variable_value (n
);
4978 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
4979 trace_debug ("Variable %d recorded", n
);
4983 #ifndef IN_PROCESS_AGENT
4985 /* Callback for traceframe_walk_blocks, used to find a given block
4986 type in a traceframe. */
4989 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
4991 char *wantedp
= data
;
4993 if (*wantedp
== blocktype
)
4999 /* Walk over all traceframe blocks of the traceframe buffer starting
5000 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5001 block found, passing in DATA unmodified. If CALLBACK returns true,
5002 this returns a pointer to where the block is found. Returns NULL
5003 if no callback call returned true, indicating that all blocks have
5006 static unsigned char *
5007 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
5009 int (*callback
) (char blocktype
,
5010 unsigned char *dataptr
,
5014 unsigned char *dataptr
;
5018 trace_debug ("traceframe %d has no data", tfnum
);
5022 /* Iterate through a traceframe's blocks, looking for a block of the
5024 for (dataptr
= database
;
5025 dataptr
< database
+ datasize
;
5029 unsigned short mlen
;
5031 if (dataptr
== trace_buffer_wrap
)
5033 /* Adjust to reflect wrapping part of the frame around to
5035 datasize
= dataptr
- database
;
5036 dataptr
= database
= trace_buffer_lo
;
5039 blocktype
= *dataptr
++;
5041 if ((*callback
) (blocktype
, dataptr
, data
))
5047 /* Skip over the registers block. */
5048 dataptr
+= register_cache_size ();
5051 /* Skip over the memory block. */
5052 dataptr
+= sizeof (CORE_ADDR
);
5053 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5054 dataptr
+= (sizeof (mlen
) + mlen
);
5057 /* Skip over the TSV block. */
5058 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5061 /* Skip over the static trace data block. */
5062 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5063 dataptr
+= (sizeof (mlen
) + mlen
);
5066 trace_debug ("traceframe %d has unknown block type 0x%x",
5075 /* Look for the block of type TYPE_WANTED in the trameframe starting
5076 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5079 static unsigned char *
5080 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5081 int tfnum
, char type_wanted
)
5083 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5084 match_blocktype
, &type_wanted
);
5087 static unsigned char *
5088 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5090 unsigned char *regblock
;
5092 regblock
= traceframe_find_block_type (tframe
->data
,
5096 if (regblock
== NULL
)
5097 trace_debug ("traceframe %d has no register data", tfnum
);
5102 /* Get registers from a traceframe. */
5105 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5107 unsigned char *dataptr
;
5108 struct tracepoint
*tpoint
;
5109 struct traceframe
*tframe
;
5111 tframe
= find_traceframe (tfnum
);
5115 trace_debug ("traceframe %d not found", tfnum
);
5119 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5120 if (dataptr
== NULL
)
5122 /* Mark registers unavailable. */
5123 supply_regblock (regcache
, NULL
);
5125 /* We can generally guess at a PC, although this will be
5126 misleading for while-stepping frames and multi-location
5128 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5130 regcache_write_pc (regcache
, tpoint
->address
);
5133 supply_regblock (regcache
, dataptr
);
5139 traceframe_get_pc (struct traceframe
*tframe
)
5141 struct regcache regcache
;
5142 unsigned char *dataptr
;
5144 dataptr
= traceframe_find_regblock (tframe
, -1);
5145 if (dataptr
== NULL
)
5148 init_register_cache (®cache
, dataptr
);
5149 return regcache_read_pc (®cache
);
5152 /* Read a requested block of memory from a trace frame. */
5155 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5156 unsigned char *buf
, ULONGEST length
,
5159 struct traceframe
*tframe
;
5160 unsigned char *database
, *dataptr
;
5161 unsigned int datasize
;
5163 unsigned short mlen
;
5165 trace_debug ("traceframe_read_mem");
5167 tframe
= find_traceframe (tfnum
);
5171 trace_debug ("traceframe %d not found", tfnum
);
5175 datasize
= tframe
->data_size
;
5176 database
= dataptr
= &tframe
->data
[0];
5178 /* Iterate through a traceframe's blocks, looking for memory. */
5179 while ((dataptr
= traceframe_find_block_type (dataptr
,
5181 - (dataptr
- database
),
5182 tfnum
, 'M')) != NULL
)
5184 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5185 dataptr
+= sizeof (maddr
);
5186 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5187 dataptr
+= sizeof (mlen
);
5188 trace_debug ("traceframe %d has %d bytes at %s",
5189 tfnum
, mlen
, paddress (maddr
));
5191 /* If the block includes the first part of the desired range,
5192 return as much it has; GDB will re-request the remainder,
5193 which might be in a different block of this trace frame. */
5194 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5196 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5200 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5205 /* Skip over this block. */
5209 trace_debug ("traceframe %d has no memory data for the desired region",
5217 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5220 struct traceframe
*tframe
;
5221 unsigned char *database
, *dataptr
;
5222 unsigned int datasize
;
5225 trace_debug ("traceframe_read_tsv");
5227 tfnum
= current_traceframe
;
5231 trace_debug ("no current traceframe");
5235 tframe
= find_traceframe (tfnum
);
5239 trace_debug ("traceframe %d not found", tfnum
);
5243 datasize
= tframe
->data_size
;
5244 database
= dataptr
= &tframe
->data
[0];
5246 /* Iterate through a traceframe's blocks, looking for the tsv. */
5247 while ((dataptr
= traceframe_find_block_type (dataptr
,
5249 - (dataptr
- database
),
5250 tfnum
, 'V')) != NULL
)
5252 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5253 dataptr
+= sizeof (vnum
);
5255 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5257 /* Check that this is the variable we want. */
5260 memcpy (val
, dataptr
, sizeof (*val
));
5264 /* Skip over this block. */
5265 dataptr
+= sizeof (LONGEST
);
5268 trace_debug ("traceframe %d has no data for variable %d",
5273 /* Read a requested block of static tracepoint data from a trace
5277 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5278 unsigned char *buf
, ULONGEST length
,
5281 struct traceframe
*tframe
;
5282 unsigned char *database
, *dataptr
;
5283 unsigned int datasize
;
5284 unsigned short mlen
;
5286 trace_debug ("traceframe_read_sdata");
5288 tframe
= find_traceframe (tfnum
);
5292 trace_debug ("traceframe %d not found", tfnum
);
5296 datasize
= tframe
->data_size
;
5297 database
= &tframe
->data
[0];
5299 /* Iterate through a traceframe's blocks, looking for static
5301 dataptr
= traceframe_find_block_type (database
, datasize
,
5303 if (dataptr
!= NULL
)
5305 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5306 dataptr
+= sizeof (mlen
);
5309 if (offset
+ length
> mlen
)
5310 length
= mlen
- offset
;
5312 memcpy (buf
, dataptr
, length
);
5320 trace_debug ("traceframe %d has no static trace data", tfnum
);
5326 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5327 object. DATA is pointer to a struct buffer holding the
5328 traceframe-info object being built. */
5331 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5333 struct buffer
*buffer
= data
;
5339 unsigned short mlen
;
5342 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5343 dataptr
+= sizeof (maddr
);
5344 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5345 dataptr
+= sizeof (mlen
);
5346 buffer_xml_printf (buffer
,
5347 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5348 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5358 warning ("Unhandled trace block type (%d) '%c ' "
5359 "while building trace frame info.",
5360 blocktype
, blocktype
);
5367 /* Build a traceframe-info object for traceframe number TFNUM into
5371 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5373 struct traceframe
*tframe
;
5375 trace_debug ("traceframe_read_info");
5377 tframe
= find_traceframe (tfnum
);
5381 trace_debug ("traceframe %d not found", tfnum
);
5385 buffer_grow_str (buffer
, "<traceframe-info>\n");
5386 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5387 tfnum
, build_traceframe_info_xml
, buffer
);
5388 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5392 /* Return the first fast tracepoint whose jump pad contains PC. */
5394 static struct tracepoint
*
5395 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5397 struct tracepoint
*tpoint
;
5399 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5400 if (tpoint
->type
== fast_tracepoint
)
5401 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5407 /* Return the first fast tracepoint whose trampoline contains PC. */
5409 static struct tracepoint
*
5410 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5412 struct tracepoint
*tpoint
;
5414 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5416 if (tpoint
->type
== fast_tracepoint
5417 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5424 /* Return GDBserver's tracepoint that matches the IP Agent's
5425 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5428 static struct tracepoint
*
5429 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5431 struct tracepoint
*tpoint
;
5433 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5434 if (tpoint
->type
== fast_tracepoint
)
5435 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5443 /* The type of the object that is used to synchronize fast tracepoint
5446 typedef struct collecting_t
5448 /* The fast tracepoint number currently collecting. */
5451 /* A number that GDBserver can use to identify the thread that is
5452 presently holding the collect lock. This need not (and usually
5453 is not) the thread id, as getting the current thread ID usually
5454 requires a system call, which we want to avoid like the plague.
5455 Usually this is thread's TCB, found in the TLS (pseudo-)
5456 register, which is readable with a single insn on several
5458 uintptr_t thread_area
;
5461 #ifndef IN_PROCESS_AGENT
5464 force_unlock_trace_buffer (void)
5466 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5469 /* Check if the thread identified by THREAD_AREA which is stopped at
5470 STOP_PC, is presently locking the fast tracepoint collection, and
5471 if so, gather some status of said collection. Returns 0 if the
5472 thread isn't collecting or in the jump pad at all. 1, if in the
5473 jump pad (or within gdb_collect) and hasn't executed the adjusted
5474 original insn yet (can set a breakpoint there and run to it). 2,
5475 if presently executing the adjusted original insn --- in which
5476 case, if we want to move the thread out of the jump pad, we need to
5477 single-step it until this function returns 0. */
5480 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5482 struct fast_tpoint_collect_status
*status
)
5484 CORE_ADDR ipa_collecting
;
5485 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5486 CORE_ADDR ipa_gdb_trampoline_buffer
;
5487 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5488 struct tracepoint
*tpoint
;
5489 int needs_breakpoint
;
5491 /* The thread THREAD_AREA is either:
5493 0. not collecting at all, not within the jump pad, or within
5494 gdb_collect or one of its callees.
5496 1. in the jump pad and haven't reached gdb_collect
5498 2. within gdb_collect (out of the jump pad) (collect is set)
5500 3. we're in the jump pad, after gdb_collect having returned,
5501 possibly executing the adjusted insns.
5503 For cases 1 and 3, `collecting' may or not be set. The jump pad
5504 doesn't have any complicated jump logic, so we can tell if the
5505 thread is executing the adjust original insn or not by just
5506 matching STOP_PC with known jump pad addresses. If we it isn't
5507 yet executing the original insn, set a breakpoint there, and let
5508 the thread run to it, so to quickly step over a possible (many
5509 insns) gdb_collect call. Otherwise, or when the breakpoint is
5510 hit, only a few (small number of) insns are left to be executed
5511 in the jump pad. Single-step the thread until it leaves the
5516 needs_breakpoint
= 0;
5517 trace_debug ("fast_tracepoint_collecting");
5519 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5520 &ipa_gdb_jump_pad_buffer
))
5521 fatal ("error extracting `gdb_jump_pad_buffer'");
5522 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5523 &ipa_gdb_jump_pad_buffer_end
))
5524 fatal ("error extracting `gdb_jump_pad_buffer_end'");
5526 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5527 &ipa_gdb_trampoline_buffer
))
5528 fatal ("error extracting `gdb_trampoline_buffer'");
5529 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5530 &ipa_gdb_trampoline_buffer_end
))
5531 fatal ("error extracting `gdb_trampoline_buffer_end'");
5533 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5534 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5536 /* We can tell which tracepoint(s) the thread is collecting by
5537 matching the jump pad address back to the tracepoint. */
5538 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5541 warning ("in jump pad, but no matching tpoint?");
5546 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5548 tpoint
->number
, paddress (tpoint
->address
),
5549 paddress (tpoint
->jump_pad
),
5550 paddress (tpoint
->jump_pad_end
),
5551 paddress (tpoint
->adjusted_insn_addr
),
5552 paddress (tpoint
->adjusted_insn_addr_end
));
5555 /* Definitely in the jump pad. May or may not need
5556 fast-exit-jump-pad breakpoint. */
5557 if (tpoint
->jump_pad
<= stop_pc
5558 && stop_pc
< tpoint
->adjusted_insn_addr
)
5559 needs_breakpoint
= 1;
5561 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5562 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5564 /* We can tell which tracepoint(s) the thread is collecting by
5565 matching the trampoline address back to the tracepoint. */
5566 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5569 warning ("in trampoline, but no matching tpoint?");
5574 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5575 tpoint
->number
, paddress (tpoint
->address
),
5576 paddress (tpoint
->trampoline
),
5577 paddress (tpoint
->trampoline_end
));
5580 /* Have not reached jump pad yet, but treat the trampoline as a
5581 part of the jump pad that is before the adjusted original
5583 needs_breakpoint
= 1;
5587 collecting_t ipa_collecting_obj
;
5589 /* If `collecting' is set/locked, then the THREAD_AREA thread
5590 may or not be the one holding the lock. We have to read the
5591 lock to find out. */
5593 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5596 trace_debug ("fast_tracepoint_collecting:"
5597 " failed reading 'collecting' in the inferior");
5601 if (!ipa_collecting
)
5603 trace_debug ("fast_tracepoint_collecting: not collecting"
5604 " (and nobody is).");
5608 /* Some thread is collecting. Check which. */
5609 if (read_inferior_memory (ipa_collecting
,
5610 (unsigned char *) &ipa_collecting_obj
,
5611 sizeof (ipa_collecting_obj
)) != 0)
5614 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5616 trace_debug ("fast_tracepoint_collecting: not collecting "
5617 "(another thread is)");
5622 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5625 warning ("fast_tracepoint_collecting: collecting, "
5626 "but tpoint %s not found?",
5627 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5631 /* The thread is within `gdb_collect', skip over the rest of
5632 fast tracepoint collection quickly using a breakpoint. */
5633 needs_breakpoint
= 1;
5636 /* The caller wants a bit of status detail. */
5639 status
->tpoint_num
= tpoint
->number
;
5640 status
->tpoint_addr
= tpoint
->address
;
5641 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5642 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5645 if (needs_breakpoint
)
5647 /* Hasn't executed the original instruction yet. Set breakpoint
5648 there, and wait till it's hit, then single-step until exiting
5652 fast_tracepoint_collecting, returning continue-until-break at %s",
5653 paddress (tpoint
->adjusted_insn_addr
));
5655 return 1; /* continue */
5659 /* Just single-step until exiting the jump pad. */
5661 trace_debug ("fast_tracepoint_collecting, returning "
5662 "need-single-step (%s-%s)",
5663 paddress (tpoint
->adjusted_insn_addr
),
5664 paddress (tpoint
->adjusted_insn_addr_end
));
5666 return 2; /* single-step */
5672 #ifdef IN_PROCESS_AGENT
5674 /* The global fast tracepoint collect lock. Points to a collecting_t
5675 object built on the stack by the jump pad, if presently locked;
5676 NULL if it isn't locked. Note that this lock *must* be set while
5677 executing any *function other than the jump pad. See
5678 fast_tracepoint_collecting. */
5679 static collecting_t
* ATTR_USED collecting
;
5681 /* This routine, called from the jump pad (in asm) is designed to be
5682 called from the jump pads of fast tracepoints, thus it is on the
5685 IP_AGENT_EXPORT
void ATTR_USED
5686 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5688 struct fast_tracepoint_ctx ctx
;
5690 /* Don't do anything until the trace run is completely set up. */
5694 ctx
.base
.type
= fast_tracepoint
;
5696 ctx
.regcache_initted
= 0;
5697 /* Wrap the regblock in a register cache (in the stack, we don't
5698 want to malloc here). */
5699 ctx
.regspace
= alloca (register_cache_size ());
5700 if (ctx
.regspace
== NULL
)
5702 trace_debug ("Trace buffer block allocation failed, skipping");
5706 for (ctx
.tpoint
= tpoint
;
5707 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5708 ctx
.tpoint
= ctx
.tpoint
->next
)
5710 if (!ctx
.tpoint
->enabled
)
5713 /* Multiple tracepoints of different types, such as fast tracepoint and
5714 static tracepoint, can be set at the same address. */
5715 if (ctx
.tpoint
->type
!= tpoint
->type
)
5718 /* Test the condition if present, and collect if true. */
5719 if (ctx
.tpoint
->cond
== NULL
5720 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5723 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5724 ctx
.tpoint
->address
, ctx
.tpoint
);
5726 /* Note that this will cause original insns to be written back
5727 to where we jumped from, but that's OK because we're jumping
5728 back to the next whole instruction. This will go badly if
5729 instruction restoration is not atomic though. */
5730 if (stopping_tracepoint
5731 || trace_buffer_is_full
5732 || expr_eval_result
!= expr_eval_no_error
)
5740 /* If there was a condition and it evaluated to false, the only
5741 way we would stop tracing is if there was an error during
5742 condition expression evaluation. */
5743 if (expr_eval_result
!= expr_eval_no_error
)
5754 #ifndef IN_PROCESS_AGENT
5757 get_raw_reg_func_addr (void)
5759 return ipa_sym_addrs
.addr_get_raw_reg
;
5763 get_get_tsv_func_addr (void)
5765 return ipa_sym_addrs
.addr_get_trace_state_variable_value
;
5769 get_set_tsv_func_addr (void)
5771 return ipa_sym_addrs
.addr_set_trace_state_variable_value
;
5775 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5776 CORE_ADDR
*jump_entry
)
5778 CORE_ADDR entry_point
= *jump_entry
;
5779 enum eval_result_type err
;
5781 trace_debug ("Starting condition compilation for tracepoint %d\n",
5784 /* Initialize the global pointer to the code being built. */
5785 current_insn_ptr
= *jump_entry
;
5789 err
= compile_bytecodes (tpoint
->cond
);
5791 if (err
== expr_eval_no_error
)
5795 /* Record the beginning of the compiled code. */
5796 tpoint
->compiled_cond
= entry_point
;
5798 trace_debug ("Condition compilation for tracepoint %d complete\n",
5803 /* Leave the unfinished code in situ, but don't point to it. */
5805 tpoint
->compiled_cond
= 0;
5807 trace_debug ("Condition compilation for tracepoint %d failed, "
5809 tpoint
->number
, err
);
5812 /* Update the code pointer passed in. Note that we do this even if
5813 the compile fails, so that we can look at the partial results
5814 instead of letting them be overwritten. */
5815 *jump_entry
= current_insn_ptr
;
5817 /* Leave a gap, to aid dump decipherment. */
5821 /* We'll need to adjust these when we consider bi-arch setups, and big
5825 write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
)
5827 return write_inferior_memory (where
,
5828 (unsigned char *) &ptr
, sizeof (void *));
5831 /* The base pointer of the IPA's heap. This is the only memory the
5832 IPA is allowed to use. The IPA should _not_ call the inferior's
5833 `malloc' during operation. That'd be slow, and, most importantly,
5834 it may not be safe. We may be collecting a tracepoint in a signal
5835 handler, for example. */
5836 static CORE_ADDR target_tp_heap
;
5838 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5842 target_malloc (ULONGEST size
)
5846 if (target_tp_heap
== 0)
5848 /* We have the pointer *address*, need what it points to. */
5849 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5851 fatal ("could get target heap head pointer");
5854 ptr
= target_tp_heap
;
5855 target_tp_heap
+= size
;
5857 /* Pad to 8-byte alignment. */
5858 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
5864 download_agent_expr (struct agent_expr
*expr
)
5866 CORE_ADDR expr_addr
;
5867 CORE_ADDR expr_bytes
;
5869 expr_addr
= target_malloc (sizeof (*expr
));
5870 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
5872 expr_bytes
= target_malloc (expr
->length
);
5873 write_inferior_data_ptr (expr_addr
+ offsetof (struct agent_expr
, bytes
),
5875 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
5880 /* Align V up to N bits. */
5881 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5883 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5886 download_tracepoint_1 (struct tracepoint
*tpoint
)
5888 struct tracepoint target_tracepoint
;
5889 CORE_ADDR tpptr
= 0;
5891 gdb_assert (tpoint
->type
== fast_tracepoint
5892 || tpoint
->type
== static_tracepoint
);
5894 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
5896 CORE_ADDR jentry
, jump_entry
;
5898 jentry
= jump_entry
= get_jump_space_head ();
5900 if (tpoint
->cond
!= NULL
)
5902 /* Pad to 8-byte alignment. (needed?) */
5903 /* Actually this should be left for the target to
5905 jentry
= UALIGN (jentry
, 8);
5907 compile_tracepoint_condition (tpoint
, &jentry
);
5910 /* Pad to 8-byte alignment. */
5911 jentry
= UALIGN (jentry
, 8);
5912 claim_jump_space (jentry
- jump_entry
);
5915 target_tracepoint
= *tpoint
;
5917 tpptr
= target_malloc (sizeof (*tpoint
));
5918 tpoint
->obj_addr_on_target
= tpptr
;
5920 /* Write the whole object. We'll fix up its pointers in a bit.
5921 Assume no next for now. This is fixed up above on the next
5922 iteration, if there's any. */
5923 target_tracepoint
.next
= NULL
;
5924 /* Need to clear this here too, since we're downloading the
5925 tracepoints before clearing our own copy. */
5926 target_tracepoint
.hit_count
= 0;
5928 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
5929 sizeof (target_tracepoint
));
5932 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5934 download_agent_expr (tpoint
->cond
));
5936 if (tpoint
->numactions
)
5939 CORE_ADDR actions_array
;
5941 /* The pointers array. */
5943 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
5944 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5948 /* Now for each pointer, download the action. */
5949 for (i
= 0; i
< tpoint
->numactions
; i
++)
5951 struct tracepoint_action
*action
= tpoint
->actions
[i
];
5952 CORE_ADDR ipa_action
= action
->ops
->download (action
);
5954 if (ipa_action
!= 0)
5955 write_inferior_data_ptr
5956 (actions_array
+ i
* sizeof (sizeof (*tpoint
->actions
)),
5962 #define IPA_PROTO_FAST_TRACE_FLAG 0
5963 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
5964 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
5965 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
5966 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
5968 /* Send a command to agent to download and install tracepoint TPOINT. */
5971 tracepoint_send_agent (struct tracepoint
*tpoint
)
5973 char buf
[IPA_CMD_BUF_SIZE
];
5978 strcpy (p
, "FastTrace:");
5981 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
5982 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
5983 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
5984 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
5985 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
5986 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
5987 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
5988 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
5989 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
5990 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
5991 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
5994 p
= agent_expr_send (p
, tpoint
->cond
);
5996 /* tracepoint_action */
5997 for (i
= 0; i
< tpoint
->numactions
; i
++)
5999 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6001 p
[0] = action
->type
;
6002 p
= action
->ops
->send (&p
[1], action
);
6005 get_jump_space_head ();
6006 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6007 agent can use jump pad from it. */
6008 if (tpoint
->type
== fast_tracepoint
)
6010 memcpy (p
, &gdb_jump_pad_head
, 8);
6014 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
6018 if (strncmp (buf
, "OK", 2) != 0)
6021 /* The value of tracepoint's target address is stored in BUF. */
6022 memcpy (&tpoint
->obj_addr_on_target
,
6023 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6025 if (tpoint
->type
== fast_tracepoint
)
6028 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6031 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6032 (unsigned int) tpoint
->obj_addr_on_target
,
6033 (unsigned int) gdb_jump_pad_head
);
6035 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6037 /* This has been done in agent. We should also set up record for it. */
6038 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6041 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6048 download_tracepoint (struct tracepoint
*tpoint
)
6050 struct tracepoint
*tp
, *tp_prev
;
6052 if (tpoint
->type
!= fast_tracepoint
6053 && tpoint
->type
!= static_tracepoint
)
6056 download_tracepoint_1 (tpoint
);
6058 /* Find the previous entry of TPOINT, which is fast tracepoint or
6059 static tracepoint. */
6061 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6063 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6069 CORE_ADDR tp_prev_target_next_addr
;
6071 /* Insert TPOINT after TP_PREV in IPA. */
6072 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6073 + offsetof (struct tracepoint
, next
),
6074 &tp_prev_target_next_addr
))
6075 fatal ("error reading `tp_prev->next'");
6077 /* tpoint->next = tp_prev->next */
6078 write_inferior_data_ptr (tpoint
->obj_addr_on_target
6079 + offsetof (struct tracepoint
, next
),
6080 tp_prev_target_next_addr
);
6081 /* tp_prev->next = tpoint */
6082 write_inferior_data_ptr (tp_prev
->obj_addr_on_target
6083 + offsetof (struct tracepoint
, next
),
6084 tpoint
->obj_addr_on_target
);
6087 /* First object in list, set the head pointer in the
6089 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
,
6090 tpoint
->obj_addr_on_target
);
6095 download_trace_state_variables (void)
6097 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6098 struct trace_state_variable
*tsv
;
6100 /* Start out empty. */
6101 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6103 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6105 struct trace_state_variable target_tsv
;
6107 /* TSV's with a getter have been initialized equally in both the
6108 inferior and GDBserver. Skip them. */
6109 if (tsv
->getter
!= NULL
)
6115 ptr
= target_malloc (sizeof (*tsv
));
6117 if (tsv
== trace_state_variables
)
6119 /* First object in list, set the head pointer in the
6122 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
,
6127 write_inferior_data_ptr (prev_ptr
6128 + offsetof (struct trace_state_variable
,
6133 /* Write the whole object. We'll fix up its pointers in a bit.
6134 Assume no next, fixup when needed. */
6135 target_tsv
.next
= NULL
;
6137 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6138 sizeof (target_tsv
));
6140 if (tsv
->name
!= NULL
)
6142 size_t size
= strlen (tsv
->name
) + 1;
6143 CORE_ADDR name_addr
= target_malloc (size
);
6144 write_inferior_memory (name_addr
,
6145 (unsigned char *) tsv
->name
, size
);
6146 write_inferior_data_ptr (ptr
6147 + offsetof (struct trace_state_variable
,
6152 if (tsv
->getter
!= NULL
)
6154 fatal ("what to do with these?");
6160 /* Fixup the next pointer in the last item in the list. */
6161 write_inferior_data_ptr (prev_ptr
6162 + offsetof (struct trace_state_variable
,
6167 /* Upload complete trace frames out of the IP Agent's trace buffer
6168 into GDBserver's trace buffer. This always uploads either all or
6169 no trace frames. This is the counter part of
6170 `trace_alloc_trace_buffer'. See its description of the atomic
6171 synching mechanism. */
6174 upload_fast_traceframes (void)
6176 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6177 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6179 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6180 unsigned int curr_tbctrl_idx
;
6181 unsigned int ipa_trace_buffer_ctrl_curr
;
6182 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6183 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6184 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6185 CORE_ADDR ipa_trace_buffer_lo
;
6186 CORE_ADDR ipa_trace_buffer_hi
;
6188 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6189 &ipa_traceframe_read_count_racy
))
6191 /* This will happen in most targets if the current thread is
6196 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6197 &ipa_traceframe_write_count_racy
))
6200 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6201 ipa_traceframe_write_count_racy
6202 - ipa_traceframe_read_count_racy
,
6203 ipa_traceframe_write_count_racy
,
6204 ipa_traceframe_read_count_racy
);
6206 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6209 about_to_request_buffer_space_bkpt
6210 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6213 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6214 &ipa_trace_buffer_ctrl_curr
))
6217 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6219 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6222 unsigned int prev
, counter
;
6224 /* Update the token, with new counters, and the GDBserver stamp
6225 bit. Alway reuse the current TBC index. */
6226 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6227 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6229 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6235 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6236 ipa_trace_buffer_ctrl_curr
))
6239 trace_debug ("Lib: Committed %08x -> %08x",
6240 ipa_trace_buffer_ctrl_curr_old
,
6241 ipa_trace_buffer_ctrl_curr
);
6243 /* Re-read these, now that we've installed the
6244 `about_to_request_buffer_space' breakpoint/lock. A thread could
6245 have finished a traceframe between the last read of these
6246 counters and setting the breakpoint above. If we start
6247 uploading, we never want to leave this function with
6248 traceframe_read_count != 0, otherwise, GDBserver could end up
6249 incrementing the counter tokens more than once (due to event loop
6250 nesting), which would break the IP agent's "effective" detection
6251 (see trace_alloc_trace_buffer). */
6252 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6253 &ipa_traceframe_read_count
))
6255 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6256 &ipa_traceframe_write_count
))
6261 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6262 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6263 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6265 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6266 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6267 trace_debug ("note that ipa_traceframe_count's parts changed");
6270 /* Get the address of the current TBC object (the IP agent has an
6271 array of 3 such objects). The index is stored in the TBC
6273 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6274 ipa_trace_buffer_ctrl_addr
6275 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6277 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6278 (unsigned char *) &ipa_trace_buffer_ctrl
,
6279 sizeof (struct ipa_trace_buffer_control
)))
6282 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6283 &ipa_trace_buffer_lo
))
6285 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6286 &ipa_trace_buffer_hi
))
6289 /* Offsets are easier to grok for debugging than raw addresses,
6290 especially for the small trace buffer sizes that are useful for
6292 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6293 "endfree=%d wrap=%d hi=%d",
6295 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6296 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6297 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6298 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6299 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6301 /* Note that the IPA's buffer is always circular. */
6303 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6305 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6306 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6308 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6309 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6310 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6311 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6314 tf
= IPA_FIRST_TRACEFRAME ();
6316 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6318 struct tracepoint
*tpoint
;
6319 struct traceframe
*tframe
;
6320 unsigned char *block
;
6321 struct traceframe ipa_tframe
;
6323 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6324 offsetof (struct traceframe
, data
)))
6325 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6327 if (ipa_tframe
.tpnum
== 0)
6328 fatal ("Uploading: No (more) fast traceframes, but "
6329 "ipa_traceframe_count == %u??\n",
6330 ipa_traceframe_write_count
- ipa_traceframe_read_count
);
6332 /* Note that this will be incorrect for multi-location
6334 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6336 tframe
= add_traceframe (tpoint
);
6339 trace_buffer_is_full
= 1;
6340 trace_debug ("Uploading: trace buffer is full");
6344 /* Copy the whole set of blocks in one go for now. FIXME:
6345 split this in smaller blocks. */
6346 block
= add_traceframe_block (tframe
, tpoint
,
6347 ipa_tframe
.data_size
);
6350 if (read_inferior_memory (tf
6351 + offsetof (struct traceframe
, data
),
6352 block
, ipa_tframe
.data_size
))
6353 error ("Uploading: Couldn't read traceframe data at %s\n",
6354 paddress (tf
+ offsetof (struct traceframe
, data
)));
6357 trace_debug ("Uploading: traceframe didn't fit");
6358 finish_traceframe (tframe
);
6361 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6363 /* If we freed the traceframe that wrapped around, go back
6364 to the non-wrap case. */
6365 if (tf
< ipa_trace_buffer_ctrl
.start
)
6367 trace_debug ("Lib: Discarding past the wraparound");
6368 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6370 ipa_trace_buffer_ctrl
.start
= tf
;
6371 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6372 ++ipa_traceframe_read_count
;
6374 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6375 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6377 trace_debug ("Lib: buffer is fully empty. "
6378 "Trace buffer [%d] start=%d free=%d endfree=%d",
6380 (int) (ipa_trace_buffer_ctrl
.start
6381 - ipa_trace_buffer_lo
),
6382 (int) (ipa_trace_buffer_ctrl
.free
6383 - ipa_trace_buffer_lo
),
6384 (int) (ipa_trace_buffer_ctrl
.end_free
6385 - ipa_trace_buffer_lo
));
6387 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6388 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6389 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6390 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6393 trace_debug ("Uploaded a traceframe\n"
6394 "Lib: Trace buffer [%d] start=%d free=%d "
6395 "endfree=%d wrap=%d hi=%d",
6397 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6398 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6399 (int) (ipa_trace_buffer_ctrl
.end_free
6400 - ipa_trace_buffer_lo
),
6401 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6402 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6405 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6406 (unsigned char *) &ipa_trace_buffer_ctrl
,
6407 sizeof (struct ipa_trace_buffer_control
)))
6410 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6411 ipa_traceframe_read_count
);
6413 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6416 cancel_breakpoints ();
6418 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6419 about_to_request_buffer_space_bkpt
= NULL
;
6423 if (trace_buffer_is_full
)
6428 #ifdef IN_PROCESS_AGENT
6430 IP_AGENT_EXPORT
int ust_loaded
;
6431 IP_AGENT_EXPORT
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6435 /* Static tracepoints. */
6437 /* UST puts a "struct tracepoint" in the global namespace, which
6438 conflicts with our tracepoint. Arguably, being a library, it
6439 shouldn't take ownership of such a generic name. We work around it
6441 #define tracepoint ust_tracepoint
6442 #include <ust/ust.h>
6445 extern int serialize_to_text (char *outbuf
, int bufsize
,
6446 const char *fmt
, va_list ap
);
6448 #define GDB_PROBE_NAME "gdb"
6450 /* We dynamically search for the UST symbols instead of linking them
6451 in. This lets the user decide if the application uses static
6452 tracepoints, instead of always pulling libust.so in. This vector
6453 holds pointers to all functions we care about. */
6457 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6458 const char *fmt
, va_list ap
);
6460 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6461 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6463 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6465 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6468 void (*marker_iter_start
) (struct marker_iter
*iter
);
6469 void (*marker_iter_next
) (struct marker_iter
*iter
);
6470 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6471 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6476 /* Cast through typeof to catch incompatible API changes. Since UST
6477 only builds with gcc, we can freely use gcc extensions here
6479 #define GET_UST_SYM(SYM) \
6482 if (ust_ops.SYM == NULL) \
6483 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6484 if (ust_ops.SYM == NULL) \
6488 #define USTF(SYM) ust_ops.SYM
6490 /* Get pointers to all libust.so functions we care about. */
6495 GET_UST_SYM (serialize_to_text
);
6497 GET_UST_SYM (ltt_probe_register
);
6498 GET_UST_SYM (ltt_probe_unregister
);
6499 GET_UST_SYM (ltt_marker_connect
);
6500 GET_UST_SYM (ltt_marker_disconnect
);
6502 GET_UST_SYM (marker_iter_start
);
6503 GET_UST_SYM (marker_iter_next
);
6504 GET_UST_SYM (marker_iter_stop
);
6505 GET_UST_SYM (marker_iter_reset
);
6511 /* Given an UST marker, return the matching gdb static tracepoint.
6512 The match is done by address. */
6514 static struct tracepoint
*
6515 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6517 struct tracepoint
*tpoint
;
6519 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6521 if (tpoint
->type
!= static_tracepoint
)
6524 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6531 /* The probe function we install on lttng/ust markers. Whenever a
6532 probed ust marker is hit, this function is called. This is similar
6533 to gdb_collect, only for static tracepoints, instead of fast
6537 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6538 struct registers
*regs
, void *call_private
,
6539 const char *fmt
, va_list *args
)
6541 struct tracepoint
*tpoint
;
6542 struct static_tracepoint_ctx ctx
;
6544 /* Don't do anything until the trace run is completely set up. */
6547 trace_debug ("gdb_probe: not tracing\n");
6551 ctx
.base
.type
= static_tracepoint
;
6552 ctx
.regcache_initted
= 0;
6557 /* Wrap the regblock in a register cache (in the stack, we don't
6558 want to malloc here). */
6559 ctx
.regspace
= alloca (register_cache_size ());
6560 if (ctx
.regspace
== NULL
)
6562 trace_debug ("Trace buffer block allocation failed, skipping");
6566 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6569 trace_debug ("gdb_probe: marker not known: "
6570 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6571 mdata
->location
, mdata
->channel
,
6572 mdata
->name
, mdata
->format
);
6576 if (!tpoint
->enabled
)
6578 trace_debug ("gdb_probe: tracepoint disabled");
6582 ctx
.tpoint
= tpoint
;
6584 trace_debug ("gdb_probe: collecting marker: "
6585 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6586 mdata
->location
, mdata
->channel
,
6587 mdata
->name
, mdata
->format
);
6589 /* Test the condition if present, and collect if true. */
6590 if (tpoint
->cond
== NULL
6591 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6594 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6595 tpoint
->address
, tpoint
);
6597 if (stopping_tracepoint
6598 || trace_buffer_is_full
6599 || expr_eval_result
!= expr_eval_no_error
)
6604 /* If there was a condition and it evaluated to false, the only
6605 way we would stop tracing is if there was an error during
6606 condition expression evaluation. */
6607 if (expr_eval_result
!= expr_eval_no_error
)
6612 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6613 static tracepoint string data. This is a string passed to the
6614 tracing library by the user, at the time of the tracepoint marker
6615 call. E.g., in the UST marker call:
6617 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6619 the collected data is "str FOOBAZ".
6623 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6624 struct traceframe
*tframe
)
6626 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6627 unsigned char *bufspace
;
6630 unsigned short blocklen
;
6634 trace_debug ("Wanted to collect static trace data, "
6635 "but there's no static trace data");
6639 va_copy (copy
, *umd
->args
);
6640 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6643 trace_debug ("Want to collect ust data");
6645 /* 'S' + size + string */
6646 bufspace
= add_traceframe_block (tframe
, umd
->tpoint
,
6647 1 + sizeof (blocklen
) + size
+ 1);
6648 if (bufspace
== NULL
)
6650 trace_debug ("Trace buffer block allocation failed, skipping");
6654 /* Identify a static trace data block. */
6657 blocklen
= size
+ 1;
6658 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6660 va_copy (copy
, *umd
->args
);
6661 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6662 size
+ 1, umd
->fmt
, copy
);
6665 trace_debug ("Storing static tracepoint data in regblock: %s",
6666 bufspace
+ 1 + sizeof (blocklen
));
6669 /* The probe to register with lttng/ust. */
6670 static struct ltt_available_probe gdb_ust_probe
=
6677 #endif /* HAVE_UST */
6678 #endif /* IN_PROCESS_AGENT */
6680 #ifndef IN_PROCESS_AGENT
6682 /* Ask the in-process agent to run a command. Since we don't want to
6683 have to handle the IPA hitting breakpoints while running the
6684 command, we pause all threads, remove all breakpoints, and then set
6685 the helper thread re-running. We communicate with the helper
6686 thread by means of direct memory xfering, and a socket for
6690 run_inferior_command (char *cmd
, int len
)
6693 int pid
= ptid_get_pid (current_ptid
);
6695 trace_debug ("run_inferior_command: running: %s", cmd
);
6698 uninsert_all_breakpoints ();
6700 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6702 reinsert_all_breakpoints ();
6708 #else /* !IN_PROCESS_AGENT */
6710 #include <sys/socket.h>
6713 #ifndef UNIX_PATH_MAX
6714 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6717 /* Where we put the socked used for synchronization. */
6718 #define SOCK_DIR P_tmpdir
6720 /* Thread ID of the helper thread. GDBserver reads this to know which
6721 is the help thread. This is an LWP id on Linux. */
6722 int helper_thread_id
;
6725 init_named_socket (const char *name
)
6728 struct sockaddr_un addr
;
6730 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6733 warning ("socket creation failed: %s", strerror (errno
));
6737 addr
.sun_family
= AF_UNIX
;
6739 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6740 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6742 result
= access (name
, F_OK
);
6746 result
= unlink (name
);
6749 warning ("unlink failed: %s", strerror (errno
));
6753 warning ("socket %s already exists; overwriting", name
);
6756 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6759 warning ("bind failed: %s", strerror (errno
));
6764 result
= listen (fd
, 1);
6767 warning ("listen: %s", strerror (errno
));
6775 static char agent_socket_name
[UNIX_PATH_MAX
];
6778 gdb_agent_socket_init (void)
6782 result
= xsnprintf (agent_socket_name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6783 SOCK_DIR
, getpid ());
6784 if (result
>= UNIX_PATH_MAX
)
6786 trace_debug ("string overflow allocating socket name");
6790 fd
= init_named_socket (agent_socket_name
);
6792 warning ("Error initializing named socket (%s) for communication with the "
6793 "ust helper thread. Check that directory exists and that it "
6794 "is writable.", agent_socket_name
);
6801 /* The next marker to be returned on a qTsSTM command. */
6802 static const struct marker
*next_st
;
6804 /* Returns the first known marker. */
6809 struct marker_iter iter
;
6811 USTF(marker_iter_reset
) (&iter
);
6812 USTF(marker_iter_start
) (&iter
);
6817 /* Returns the marker following M. */
6819 const struct marker
*
6820 next_marker (const struct marker
*m
)
6822 struct marker_iter iter
;
6824 USTF(marker_iter_reset
) (&iter
);
6825 USTF(marker_iter_start
) (&iter
);
6827 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6829 if (iter
.marker
== m
)
6831 USTF(marker_iter_next
) (&iter
);
6839 /* Return an hexstr version of the STR C string, fit for sending to
6843 cstr_to_hexstr (const char *str
)
6845 int len
= strlen (str
);
6846 char *hexstr
= xmalloc (len
* 2 + 1);
6847 convert_int_to_ascii ((gdb_byte
*) str
, hexstr
, len
);
6851 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6855 response_ust_marker (char *packet
, const struct marker
*st
)
6857 char *strid
, *format
, *tmp
;
6859 next_st
= next_marker (st
);
6861 tmp
= xmalloc (strlen (st
->channel
) + 1 +
6862 strlen (st
->name
) + 1);
6863 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
6865 strid
= cstr_to_hexstr (tmp
);
6868 format
= cstr_to_hexstr (st
->format
);
6870 sprintf (packet
, "m%s:%s:%s",
6871 paddress ((uintptr_t) st
->location
),
6879 /* Return the first static tracepoint, and initialize the state
6880 machine that will iterate through all the static tracepoints. */
6883 cmd_qtfstm (char *packet
)
6885 trace_debug ("Returning first trace state variable definition");
6887 if (first_marker ())
6888 response_ust_marker (packet
, first_marker ());
6890 strcpy (packet
, "l");
6893 /* Return additional trace state variable definitions. */
6896 cmd_qtsstm (char *packet
)
6898 trace_debug ("Returning static tracepoint");
6901 response_ust_marker (packet
, next_st
);
6903 strcpy (packet
, "l");
6906 /* Disconnect the GDB probe from a marker at a given address. */
6909 unprobe_marker_at (char *packet
)
6913 struct marker_iter iter
;
6915 p
+= sizeof ("unprobe_marker_at:") - 1;
6917 p
= unpack_varlen_hex (p
, &address
);
6919 USTF(marker_iter_reset
) (&iter
);
6920 USTF(marker_iter_start
) (&iter
);
6921 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6922 if ((uintptr_t ) iter
.marker
->location
== address
)
6926 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
6930 warning ("could not disable marker %s/%s",
6931 iter
.marker
->channel
, iter
.marker
->name
);
6936 /* Connect the GDB probe to a marker at a given address. */
6939 probe_marker_at (char *packet
)
6943 struct marker_iter iter
;
6946 p
+= sizeof ("probe_marker_at:") - 1;
6948 p
= unpack_varlen_hex (p
, &address
);
6950 USTF(marker_iter_reset
) (&iter
);
6952 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
6954 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
6955 if ((uintptr_t ) m
->location
== address
)
6959 trace_debug ("found marker for address. "
6960 "ltt_marker_connect (marker = %s/%s)",
6961 m
->channel
, m
->name
);
6963 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
6965 if (result
&& result
!= -EEXIST
)
6966 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
6967 m
->channel
, m
->name
, -result
);
6971 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
6972 m
->channel
, m
->name
);
6976 strcpy (packet
, "OK");
6980 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
6985 cmd_qtstmat (char *packet
)
6989 struct marker_iter iter
;
6992 p
+= sizeof ("qTSTMat:") - 1;
6994 p
= unpack_varlen_hex (p
, &address
);
6996 USTF(marker_iter_reset
) (&iter
);
6998 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7000 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7001 if ((uintptr_t ) m
->location
== address
)
7003 response_ust_marker (packet
, m
);
7007 strcpy (packet
, "l");
7017 USTF(ltt_probe_register
) (&gdb_ust_probe
);
7020 #endif /* HAVE_UST */
7022 #include <sys/syscall.h>
7026 gdb_agent_remove_socket (void)
7028 unlink (agent_socket_name
);
7031 /* Helper thread of agent. */
7034 gdb_agent_helper_thread (void *arg
)
7038 atexit (gdb_agent_remove_socket
);
7042 listen_fd
= gdb_agent_socket_init ();
7044 if (helper_thread_id
== 0)
7045 helper_thread_id
= syscall (SYS_gettid
);
7047 if (listen_fd
== -1)
7049 warning ("could not create sync socket\n");
7056 struct sockaddr_un sockaddr
;
7062 tmp
= sizeof (sockaddr
);
7066 fd
= accept (listen_fd
, &sockaddr
, &tmp
);
7068 /* It seems an ERESTARTSYS can escape out of accept. */
7069 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7073 warning ("Accept returned %d, error: %s\n",
7074 fd
, strerror (errno
));
7080 ret
= read (fd
, buf
, 1);
7081 } while (ret
== -1 && errno
== EINTR
);
7085 warning ("reading socket (fd=%d) failed with %s",
7086 fd
, strerror (errno
));
7093 if (strncmp ("close", cmd_buf
, 5) == 0)
7098 else if (strcmp ("qTfSTM", cmd_buf
) == 0)
7100 cmd_qtfstm (cmd_buf
);
7102 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7104 cmd_qtsstm (cmd_buf
);
7106 else if (strncmp ("unprobe_marker_at:",
7108 sizeof ("unprobe_marker_at:") - 1) == 0)
7110 unprobe_marker_at (cmd_buf
);
7112 else if (strncmp ("probe_marker_at:",
7114 sizeof ("probe_marker_at:") - 1) == 0)
7116 probe_marker_at (cmd_buf
);
7118 else if (strncmp ("qTSTMat:",
7120 sizeof ("qTSTMat:") - 1) == 0)
7122 cmd_qtstmat (cmd_buf
);
7124 #endif /* HAVE_UST */
7127 /* Fix compiler's warning: ignoring return value of 'write'. */
7128 ret
= write (fd
, buf
, 1);
7134 unlink (agent_socket_name
);
7136 /* Sleep endlessly to wait the whole inferior stops. This
7137 thread can not exit because GDB or GDBserver may still need
7138 'current_inferior' (representing this thread) to access
7139 inferior memory. Otherwise, this thread exits earlier than
7140 other threads, and 'current_inferior' is set to NULL. */
7151 #include <pthread.h>
7153 IP_AGENT_EXPORT
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7156 gdb_agent_init (void)
7163 /* We want the helper thread to be as transparent as possible, so
7164 have it inherit an all-signals-blocked mask. */
7166 sigfillset (&new_mask
);
7167 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7169 fatal ("pthread_sigmask (1) failed: %s", strerror (res
));
7171 res
= pthread_create (&thread
,
7173 gdb_agent_helper_thread
,
7176 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7178 fatal ("pthread_sigmask (2) failed: %s", strerror (res
));
7180 while (helper_thread_id
== 0)
7188 #include <sys/mman.h>
7191 IP_AGENT_EXPORT
char *gdb_tp_heap_buffer
;
7192 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer
;
7193 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer_end
;
7194 IP_AGENT_EXPORT
char *gdb_trampoline_buffer
;
7195 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_end
;
7196 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_error
;
7198 /* Record the result of getting buffer space for fast tracepoint
7199 trampolines. Any error message is copied, since caller may not be
7200 using persistent storage. */
7203 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7205 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7206 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7208 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7210 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7213 static void __attribute__ ((constructor
))
7214 initialize_tracepoint_ftlib (void)
7216 initialize_tracepoint ();
7221 #endif /* IN_PROCESS_AGENT */
7223 /* Return a timestamp, expressed as microseconds of the usual Unix
7224 time. (As the result is a 64-bit number, it will not overflow any
7228 get_timestamp (void)
7232 if (gettimeofday (&tv
, 0) != 0)
7235 return (LONGEST
) tv
.tv_sec
* 1000000 + tv
.tv_usec
;
7239 initialize_tracepoint (void)
7241 /* There currently no way to change the buffer size. */
7242 const int sizeOfBuffer
= 5 * 1024 * 1024;
7243 unsigned char *buf
= xmalloc (sizeOfBuffer
);
7244 init_trace_buffer (buf
, sizeOfBuffer
);
7246 /* Wire trace state variable 1 to be the timestamp. This will be
7247 uploaded to GDB upon connection and become one of its trace state
7248 variables. (In case you're wondering, if GDB already has a trace
7249 variable numbered 1, it will be renumbered.) */
7250 create_trace_state_variable (1, 0);
7251 set_trace_state_variable_name (1, "trace_timestamp");
7252 set_trace_state_variable_getter (1, get_timestamp
);
7254 #ifdef IN_PROCESS_AGENT
7259 pagesize
= sysconf (_SC_PAGE_SIZE
);
7263 gdb_tp_heap_buffer
= xmalloc (5 * 1024 * 1024);
7265 #define SCRATCH_BUFFER_NPAGES 20
7267 /* Allocate scratch buffer aligned on a page boundary, at a low
7268 address (close to the main executable's code). */
7269 for (addr
= pagesize
; addr
!= 0; addr
+= pagesize
)
7271 gdb_jump_pad_buffer
= mmap ((void *) addr
, pagesize
* SCRATCH_BUFFER_NPAGES
,
7272 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
7273 MAP_PRIVATE
| MAP_ANONYMOUS
| MAP_FIXED
,
7275 if (gdb_jump_pad_buffer
!= MAP_FAILED
)
7281 initialize_tracepoint: mmap'ing jump pad buffer failed with %s",
7284 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ pagesize
* SCRATCH_BUFFER_NPAGES
;
7287 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7289 /* It's not a fatal error for something to go wrong with trampoline
7290 buffer setup, but it can be mysterious, so create a channel to
7291 report back on what went wrong, using a fixed size since we may
7292 not be able to allocate space later when the problem occurs. */
7293 gdb_trampoline_buffer_error
= xmalloc (IPA_BUFSIZ
);
7295 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7297 initialize_low_tracepoint ();