1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2012 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "gdbthread.h"
33 /* This file is built for both GDBserver, and the in-process
34 agent (IPA), a shared library that includes a tracing agent that is
35 loaded by the inferior to support fast tracepoints. Fast
36 tracepoints (or more accurately, jump based tracepoints) are
37 implemented by patching the tracepoint location with a jump into a
38 small trampoline function whose job is to save the register state,
39 call the in-process tracing agent, and then execute the original
40 instruction that was under the tracepoint jump (possibly adjusted,
41 if PC-relative, or some such).
43 The current synchronization design is pull based. That means,
44 GDBserver does most of the work, by peeking/poking at the inferior
45 agent's memory directly for downloading tracepoint and associated
46 objects, and for uploading trace frames. Whenever the IPA needs
47 something from GDBserver (trace buffer is full, tracing stopped for
48 some reason, etc.) the IPA calls a corresponding hook function
49 where GDBserver has placed a breakpoint.
51 Each of the agents has its own trace buffer. When browsing the
52 trace frames built from slow and fast tracepoints from GDB (tfind
53 mode), there's no guarantee the user is seeing the trace frames in
54 strict chronological creation order, although, GDBserver tries to
55 keep the order relatively reasonable, by syncing the trace buffers
60 static void trace_vdebug (const char *, ...) 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 static enum eval_result_type
1350 eval_tracepoint_agent_expr (struct tracepoint_hit_ctx
*ctx
,
1351 struct traceframe
*tframe
,
1352 struct agent_expr
*aexpr
,
1355 #ifndef IN_PROCESS_AGENT
1356 static CORE_ADDR
traceframe_get_pc (struct traceframe
*tframe
);
1357 static int traceframe_read_tsv (int num
, LONGEST
*val
);
1360 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1361 struct tracepoint
*tpoint
);
1363 #ifndef IN_PROCESS_AGENT
1364 static void clear_readonly_regions (void);
1365 static void clear_installed_tracepoints (void);
1368 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1370 struct tracepoint
*tpoint
);
1371 #ifndef IN_PROCESS_AGENT
1372 static void collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
1374 struct tracepoint
*tpoint
, int current_step
);
1375 static void compile_tracepoint_condition (struct tracepoint
*tpoint
,
1376 CORE_ADDR
*jump_entry
);
1378 static void do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1380 struct tracepoint
*tpoint
,
1381 struct traceframe
*tframe
,
1382 struct tracepoint_action
*taction
);
1384 #ifndef IN_PROCESS_AGENT
1385 static struct tracepoint
*fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR
);
1387 static void install_tracepoint (struct tracepoint
*, char *own_buf
);
1388 static void download_tracepoint (struct tracepoint
*);
1389 static int install_fast_tracepoint (struct tracepoint
*, char *errbuf
);
1390 static void clone_fast_tracepoint (struct tracepoint
*to
,
1391 const struct tracepoint
*from
);
1394 static LONGEST
get_timestamp (void);
1396 #if defined(__GNUC__)
1397 # define memory_barrier() asm volatile ("" : : : "memory")
1399 # define memory_barrier() do {} while (0)
1402 /* We only build the IPA if this builtin is supported, and there are
1403 no uses of this in GDBserver itself, so we're safe in defining this
1405 #define cmpxchg(mem, oldval, newval) \
1406 __sync_val_compare_and_swap (mem, oldval, newval)
1408 /* Record that an error occurred during expression evaluation. */
1411 record_tracepoint_error (struct tracepoint
*tpoint
, const char *which
,
1412 enum eval_result_type rtype
)
1414 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1415 tpoint
->number
, paddress (tpoint
->address
), which
, rtype
);
1417 #ifdef IN_PROCESS_AGENT
1418 /* Only record the first error we get. */
1419 if (cmpxchg (&expr_eval_result
,
1421 rtype
) != expr_eval_no_error
)
1424 if (expr_eval_result
!= expr_eval_no_error
)
1428 error_tracepoint
= tpoint
;
1431 /* Trace buffer management. */
1434 clear_trace_buffer (void)
1436 trace_buffer_start
= trace_buffer_lo
;
1437 trace_buffer_free
= trace_buffer_lo
;
1438 trace_buffer_end_free
= trace_buffer_hi
;
1439 trace_buffer_wrap
= trace_buffer_hi
;
1440 /* A traceframe with zeroed fields marks the end of trace data. */
1441 ((struct traceframe
*) trace_buffer_free
)->tpnum
= 0;
1442 ((struct traceframe
*) trace_buffer_free
)->data_size
= 0;
1443 traceframe_read_count
= traceframe_write_count
= 0;
1444 traceframes_created
= 0;
1447 #ifndef IN_PROCESS_AGENT
1450 clear_inferior_trace_buffer (void)
1452 CORE_ADDR ipa_trace_buffer_lo
;
1453 CORE_ADDR ipa_trace_buffer_hi
;
1454 struct traceframe ipa_traceframe
= { 0 };
1455 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
1457 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
1458 &ipa_trace_buffer_lo
);
1459 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
1460 &ipa_trace_buffer_hi
);
1462 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
1463 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
1464 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
1465 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
1467 /* A traceframe with zeroed fields marks the end of trace data. */
1468 write_inferior_memory (ipa_sym_addrs
.addr_trace_buffer_ctrl
,
1469 (unsigned char *) &ipa_trace_buffer_ctrl
,
1470 sizeof (ipa_trace_buffer_ctrl
));
1472 write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
, 0);
1474 /* A traceframe with zeroed fields marks the end of trace data. */
1475 write_inferior_memory (ipa_trace_buffer_lo
,
1476 (unsigned char *) &ipa_traceframe
,
1477 sizeof (ipa_traceframe
));
1479 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
, 0);
1480 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
, 0);
1481 write_inferior_integer (ipa_sym_addrs
.addr_traceframes_created
, 0);
1487 init_trace_buffer (unsigned char *buf
, int bufsize
)
1489 trace_buffer_lo
= buf
;
1490 trace_buffer_hi
= trace_buffer_lo
+ bufsize
;
1492 clear_trace_buffer ();
1495 #ifdef IN_PROCESS_AGENT
1497 IP_AGENT_EXPORT
void ATTR_USED ATTR_NOINLINE
1498 about_to_request_buffer_space (void)
1500 /* GDBserver places breakpoint here while it goes about to flush
1501 data at random times. */
1502 UNKNOWN_SIDE_EFFECTS();
1507 /* Carve out a piece of the trace buffer, returning NULL in case of
1511 trace_buffer_alloc (size_t amt
)
1513 unsigned char *rslt
;
1514 struct trace_buffer_control
*tbctrl
;
1516 #ifdef IN_PROCESS_AGENT
1517 unsigned int prev
, prev_filtered
;
1518 unsigned int commit_count
;
1519 unsigned int commit
;
1520 unsigned int readout
;
1522 struct traceframe
*oldest
;
1523 unsigned char *new_start
;
1526 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1527 (long) amt
, (long) sizeof (struct traceframe
));
1529 /* Account for the EOB marker. */
1530 amt
+= sizeof (struct traceframe
);
1532 #ifdef IN_PROCESS_AGENT
1536 /* Read the current token and extract the index to try to write to,
1537 storing it in CURR. */
1538 prev
= trace_buffer_ctrl_curr
;
1539 prev_filtered
= prev
& ~GDBSERVER_FLUSH_COUNT_MASK
;
1540 curr
= prev_filtered
+ 1;
1544 about_to_request_buffer_space ();
1546 /* Start out with a copy of the current state. GDBserver may be
1547 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1548 be able to commit anyway if that happens. */
1549 trace_buffer_ctrl
[curr
]
1550 = trace_buffer_ctrl
[prev_filtered
];
1551 trace_debug ("trying curr=%u", curr
);
1553 /* The GDBserver's agent doesn't need all that syncing, and always
1554 updates TCB 0 (there's only one, mind you). */
1557 tbctrl
= &trace_buffer_ctrl
[curr
];
1559 /* Offsets are easier to grok for debugging than raw addresses,
1560 especially for the small trace buffer sizes that are useful for
1562 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1564 (int) (tbctrl
->start
- trace_buffer_lo
),
1565 (int) (tbctrl
->free
- trace_buffer_lo
),
1566 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1567 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1568 (int) (trace_buffer_hi
- trace_buffer_lo
));
1570 /* The algorithm here is to keep trying to get a contiguous block of
1571 the requested size, possibly discarding older traceframes to free
1572 up space. Since free space might come in one or two pieces,
1573 depending on whether discarded traceframes wrapped around at the
1574 high end of the buffer, we test both pieces after each
1578 /* First, if we have two free parts, try the upper one first. */
1579 if (tbctrl
->end_free
< tbctrl
->free
)
1581 if (tbctrl
->free
+ amt
<= trace_buffer_hi
)
1582 /* We have enough in the upper part. */
1586 /* Our high part of free space wasn't enough. Give up
1587 on it for now, set wraparound. We will recover the
1588 space later, if/when the wrapped-around traceframe is
1590 trace_debug ("Upper part too small, setting wraparound");
1591 tbctrl
->wrap
= tbctrl
->free
;
1592 tbctrl
->free
= trace_buffer_lo
;
1596 /* The normal case. */
1597 if (tbctrl
->free
+ amt
<= tbctrl
->end_free
)
1600 #ifdef IN_PROCESS_AGENT
1601 /* The IP Agent's buffer is always circular. It isn't used
1602 currently, but `circular_trace_buffer' could represent
1603 GDBserver's mode. If we didn't find space, ask GDBserver to
1606 flush_trace_buffer ();
1610 trace_debug ("gdbserver flushed buffer, retrying");
1614 /* GDBserver cancelled the tracing. Bail out as well. */
1617 /* If we're here, then neither part is big enough, and
1618 non-circular trace buffers are now full. */
1619 if (!circular_trace_buffer
)
1621 trace_debug ("Not enough space in the trace buffer");
1625 trace_debug ("Need more space in the trace buffer");
1627 /* If we have a circular buffer, we can try discarding the
1628 oldest traceframe and see if that helps. */
1629 oldest
= FIRST_TRACEFRAME ();
1630 if (oldest
->tpnum
== 0)
1632 /* Not good; we have no traceframes to free. Perhaps we're
1633 asking for a block that is larger than the buffer? In
1634 any case, give up. */
1635 trace_debug ("No traceframes to discard");
1639 /* We don't run this code in the in-process agent currently.
1640 E.g., we could leave the in-process agent in autonomous
1641 circular mode if we only have fast tracepoints. If we do
1642 that, then this bit becomes racy with GDBserver, which also
1643 writes to this counter. */
1644 --traceframe_write_count
;
1646 new_start
= (unsigned char *) NEXT_TRACEFRAME (oldest
);
1647 /* If we freed the traceframe that wrapped around, go back
1648 to the non-wrap case. */
1649 if (new_start
< tbctrl
->start
)
1651 trace_debug ("Discarding past the wraparound");
1652 tbctrl
->wrap
= trace_buffer_hi
;
1654 tbctrl
->start
= new_start
;
1655 tbctrl
->end_free
= tbctrl
->start
;
1657 trace_debug ("Discarded a traceframe\n"
1658 "Trace buffer [%d], start=%d free=%d "
1659 "endfree=%d wrap=%d hi=%d",
1661 (int) (tbctrl
->start
- trace_buffer_lo
),
1662 (int) (tbctrl
->free
- trace_buffer_lo
),
1663 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1664 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1665 (int) (trace_buffer_hi
- trace_buffer_lo
));
1667 /* Now go back around the loop. The discard might have resulted
1668 in either one or two pieces of free space, so we want to try
1669 both before freeing any more traceframes. */
1673 /* If we get here, we know we can provide the asked-for space. */
1675 rslt
= tbctrl
->free
;
1677 /* Adjust the request back down, now that we know we have space for
1678 the marker, but don't commit to AMT yet, we may still need to
1679 restart the operation if GDBserver touches the trace buffer
1680 (obviously only important in the in-process agent's version). */
1681 tbctrl
->free
+= (amt
- sizeof (struct traceframe
));
1683 /* Or not. If GDBserver changed the trace buffer behind our back,
1684 we get to restart a new allocation attempt. */
1686 #ifdef IN_PROCESS_AGENT
1687 /* Build the tentative token. */
1688 commit_count
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) + 0x100)
1689 & GDBSERVER_FLUSH_COUNT_MASK_CURR
);
1690 commit
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) << 12)
1694 /* Try to commit it. */
1695 readout
= cmpxchg (&trace_buffer_ctrl_curr
, prev
, commit
);
1696 if (readout
!= prev
)
1698 trace_debug ("GDBserver has touched the trace buffer, restarting."
1699 " (prev=%08x, commit=%08x, readout=%08x)",
1700 prev
, commit
, readout
);
1704 /* Hold your horses here. Even if that change was committed,
1705 GDBserver could come in, and clobber it. We need to hold to be
1706 able to tell if GDBserver clobbers before or after we committed
1707 the change. Whenever GDBserver goes about touching the IPA
1708 buffer, it sets a breakpoint in this routine, so we have a sync
1710 about_to_request_buffer_space ();
1712 /* Check if the change has been effective, even if GDBserver stopped
1713 us at the breakpoint. */
1716 unsigned int refetch
;
1720 refetch
= trace_buffer_ctrl_curr
;
1722 if (refetch
== commit
1723 || ((refetch
& GDBSERVER_FLUSH_COUNT_MASK_PREV
) >> 12) == commit_count
)
1726 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1727 "readout=%08x, refetch=%08x)",
1728 prev
, commit
, readout
, refetch
);
1732 trace_debug ("GDBserver has touched the trace buffer, not effective."
1733 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1734 prev
, commit
, readout
, refetch
);
1740 /* We have a new piece of the trace buffer. Hurray! */
1742 /* Add an EOB marker just past this allocation. */
1743 ((struct traceframe
*) tbctrl
->free
)->tpnum
= 0;
1744 ((struct traceframe
*) tbctrl
->free
)->data_size
= 0;
1746 /* Adjust the request back down, now that we know we have space for
1748 amt
-= sizeof (struct traceframe
);
1752 trace_debug ("Allocated %d bytes", (int) amt
);
1753 trace_debug ("Trace buffer [%d] start=%d free=%d "
1754 "endfree=%d wrap=%d hi=%d",
1756 (int) (tbctrl
->start
- trace_buffer_lo
),
1757 (int) (tbctrl
->free
- trace_buffer_lo
),
1758 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1759 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1760 (int) (trace_buffer_hi
- trace_buffer_lo
));
1766 #ifndef IN_PROCESS_AGENT
1768 /* Return the total free space. This is not necessarily the largest
1769 block we can allocate, because of the two-part case. */
1774 if (trace_buffer_free
<= trace_buffer_end_free
)
1775 return trace_buffer_end_free
- trace_buffer_free
;
1777 return ((trace_buffer_end_free
- trace_buffer_lo
)
1778 + (trace_buffer_hi
- trace_buffer_free
));
1781 /* An 'S' in continuation packets indicates remainder are for
1784 static int seen_step_action_flag
;
1786 /* Create a tracepoint (location) with given number and address. Add this
1787 new tracepoint to list and sort this list. */
1789 static struct tracepoint
*
1790 add_tracepoint (int num
, CORE_ADDR addr
)
1792 struct tracepoint
*tpoint
, **tp_next
;
1794 tpoint
= xmalloc (sizeof (struct tracepoint
));
1795 tpoint
->number
= num
;
1796 tpoint
->address
= addr
;
1797 tpoint
->numactions
= 0;
1798 tpoint
->actions
= NULL
;
1799 tpoint
->actions_str
= NULL
;
1800 tpoint
->cond
= NULL
;
1801 tpoint
->num_step_actions
= 0;
1802 tpoint
->step_actions
= NULL
;
1803 tpoint
->step_actions_str
= NULL
;
1804 /* Start all off as regular (slow) tracepoints. */
1805 tpoint
->type
= trap_tracepoint
;
1806 tpoint
->orig_size
= -1;
1807 tpoint
->source_strings
= NULL
;
1808 tpoint
->compiled_cond
= 0;
1809 tpoint
->handle
= NULL
;
1810 tpoint
->next
= NULL
;
1812 /* Find a place to insert this tracepoint into list in order to keep
1813 the tracepoint list still in the ascending order. There may be
1814 multiple tracepoints at the same address as TPOINT's, and this
1815 guarantees TPOINT is inserted after all the tracepoints which are
1816 set at the same address. For example, fast tracepoints A, B, C are
1817 set at the same address, and D is to be insert at the same place as
1820 -->| A |--> | B |-->| C |->...
1822 One jump pad was created for tracepoint A, B, and C, and the target
1823 address of A is referenced/used in jump pad. So jump pad will let
1824 inferior jump to A. If D is inserted in front of A, like this,
1826 -->| D |-->| A |--> | B |-->| C |->...
1828 without updating jump pad, D is not reachable during collect, which
1829 is wrong. As we can see, the order of B, C and D doesn't matter, but
1830 A should always be the `first' one. */
1831 for (tp_next
= &tracepoints
;
1832 (*tp_next
) != NULL
&& (*tp_next
)->address
<= tpoint
->address
;
1833 tp_next
= &(*tp_next
)->next
)
1835 tpoint
->next
= *tp_next
;
1837 last_tracepoint
= tpoint
;
1839 seen_step_action_flag
= 0;
1844 #ifndef IN_PROCESS_AGENT
1846 /* Return the tracepoint with the given number and address, or NULL. */
1848 static struct tracepoint
*
1849 find_tracepoint (int id
, CORE_ADDR addr
)
1851 struct tracepoint
*tpoint
;
1853 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
1854 if (tpoint
->number
== id
&& tpoint
->address
== addr
)
1860 /* Remove TPOINT from global list. */
1863 remove_tracepoint (struct tracepoint
*tpoint
)
1865 struct tracepoint
*tp
, *tp_prev
;
1867 for (tp
= tracepoints
, tp_prev
= NULL
; tp
&& tp
!= tpoint
;
1868 tp_prev
= tp
, tp
= tp
->next
)
1874 tp_prev
->next
= tp
->next
;
1876 tracepoints
= tp
->next
;
1882 /* There may be several tracepoints with the same number (because they
1883 are "locations", in GDB parlance); return the next one after the
1884 given tracepoint, or search from the beginning of the list if the
1885 first argument is NULL. */
1887 static struct tracepoint
*
1888 find_next_tracepoint_by_number (struct tracepoint
*prev_tp
, int num
)
1890 struct tracepoint
*tpoint
;
1893 tpoint
= prev_tp
->next
;
1895 tpoint
= tracepoints
;
1896 for (; tpoint
; tpoint
= tpoint
->next
)
1897 if (tpoint
->number
== num
)
1906 save_string (const char *str
, size_t len
)
1910 s
= xmalloc (len
+ 1);
1911 memcpy (s
, str
, len
);
1917 /* Append another action to perform when the tracepoint triggers. */
1920 add_tracepoint_action (struct tracepoint
*tpoint
, char *packet
)
1926 seen_step_action_flag
= 1;
1934 char *act_start
= act
;
1935 struct tracepoint_action
*action
= NULL
;
1941 struct collect_memory_action
*maction
;
1945 maction
= xmalloc (sizeof *maction
);
1946 maction
->base
.type
= *act
;
1947 maction
->base
.ops
= &m_tracepoint_action_ops
;
1948 action
= &maction
->base
;
1951 is_neg
= (*act
== '-');
1954 act
= unpack_varlen_hex (act
, &basereg
);
1956 act
= unpack_varlen_hex (act
, &maction
->addr
);
1958 act
= unpack_varlen_hex (act
, &maction
->len
);
1959 maction
->basereg
= (is_neg
1962 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
1963 pulongest (maction
->len
),
1964 paddress (maction
->addr
), maction
->basereg
);
1969 struct collect_registers_action
*raction
;
1971 raction
= xmalloc (sizeof *raction
);
1972 raction
->base
.type
= *act
;
1973 raction
->base
.ops
= &r_tracepoint_action_ops
;
1974 action
= &raction
->base
;
1976 trace_debug ("Want to collect registers");
1978 /* skip past hex digits of mask for now */
1979 while (isxdigit(*act
))
1985 struct collect_static_trace_data_action
*raction
;
1987 raction
= xmalloc (sizeof *raction
);
1988 raction
->base
.type
= *act
;
1989 raction
->base
.ops
= &l_tracepoint_action_ops
;
1990 action
= &raction
->base
;
1992 trace_debug ("Want to collect static trace data");
1997 trace_debug ("Unexpected step action, ignoring");
2002 struct eval_expr_action
*xaction
;
2004 xaction
= xmalloc (sizeof (*xaction
));
2005 xaction
->base
.type
= *act
;
2006 xaction
->base
.ops
= &x_tracepoint_action_ops
;
2007 action
= &xaction
->base
;
2009 trace_debug ("Want to evaluate expression");
2010 xaction
->expr
= gdb_parse_agent_expr (&act
);
2014 trace_debug ("unknown trace action '%c', ignoring...", *act
);
2023 if (seen_step_action_flag
)
2025 tpoint
->num_step_actions
++;
2027 tpoint
->step_actions
2028 = xrealloc (tpoint
->step_actions
,
2029 (sizeof (*tpoint
->step_actions
)
2030 * tpoint
->num_step_actions
));
2031 tpoint
->step_actions_str
2032 = xrealloc (tpoint
->step_actions_str
,
2033 (sizeof (*tpoint
->step_actions_str
)
2034 * tpoint
->num_step_actions
));
2035 tpoint
->step_actions
[tpoint
->num_step_actions
- 1] = action
;
2036 tpoint
->step_actions_str
[tpoint
->num_step_actions
- 1]
2037 = save_string (act_start
, act
- act_start
);
2041 tpoint
->numactions
++;
2043 = xrealloc (tpoint
->actions
,
2044 sizeof (*tpoint
->actions
) * tpoint
->numactions
);
2046 = xrealloc (tpoint
->actions_str
,
2047 sizeof (*tpoint
->actions_str
) * tpoint
->numactions
);
2048 tpoint
->actions
[tpoint
->numactions
- 1] = action
;
2049 tpoint
->actions_str
[tpoint
->numactions
- 1]
2050 = save_string (act_start
, act
- act_start
);
2057 /* Find or create a trace state variable with the given number. */
2059 static struct trace_state_variable
*
2060 get_trace_state_variable (int num
)
2062 struct trace_state_variable
*tsv
;
2064 #ifdef IN_PROCESS_AGENT
2065 /* Search for an existing variable. */
2066 for (tsv
= alloced_trace_state_variables
; tsv
; tsv
= tsv
->next
)
2067 if (tsv
->number
== num
)
2071 /* Search for an existing variable. */
2072 for (tsv
= trace_state_variables
; tsv
; tsv
= tsv
->next
)
2073 if (tsv
->number
== num
)
2079 /* Find or create a trace state variable with the given number. */
2081 static struct trace_state_variable
*
2082 create_trace_state_variable (int num
, int gdb
)
2084 struct trace_state_variable
*tsv
;
2086 tsv
= get_trace_state_variable (num
);
2090 /* Create a new variable. */
2091 tsv
= xmalloc (sizeof (struct trace_state_variable
));
2093 tsv
->initial_value
= 0;
2097 #ifdef IN_PROCESS_AGENT
2100 tsv
->next
= alloced_trace_state_variables
;
2101 alloced_trace_state_variables
= tsv
;
2106 tsv
->next
= trace_state_variables
;
2107 trace_state_variables
= tsv
;
2112 IP_AGENT_EXPORT LONGEST
2113 get_trace_state_variable_value (int num
)
2115 struct trace_state_variable
*tsv
;
2117 tsv
= get_trace_state_variable (num
);
2121 trace_debug ("No trace state variable %d, skipping value get", num
);
2125 /* Call a getter function if we have one. While it's tempting to
2126 set up something to only call the getter once per tracepoint hit,
2127 it could run afoul of thread races. Better to let the getter
2128 handle it directly, if necessary to worry about it. */
2130 tsv
->value
= (tsv
->getter
) ();
2132 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2133 num
, plongest (tsv
->value
));
2138 IP_AGENT_EXPORT
void
2139 set_trace_state_variable_value (int num
, LONGEST val
)
2141 struct trace_state_variable
*tsv
;
2143 tsv
= get_trace_state_variable (num
);
2147 trace_debug ("No trace state variable %d, skipping value set", num
);
2155 agent_get_trace_state_variable_value (int num
)
2157 return get_trace_state_variable_value (num
);
2161 agent_set_trace_state_variable_value (int num
, LONGEST val
)
2163 set_trace_state_variable_value (num
, val
);
2167 set_trace_state_variable_name (int num
, const char *name
)
2169 struct trace_state_variable
*tsv
;
2171 tsv
= get_trace_state_variable (num
);
2175 trace_debug ("No trace state variable %d, skipping name set", num
);
2179 tsv
->name
= (char *) name
;
2183 set_trace_state_variable_getter (int num
, LONGEST (*getter
) (void))
2185 struct trace_state_variable
*tsv
;
2187 tsv
= get_trace_state_variable (num
);
2191 trace_debug ("No trace state variable %d, skipping getter set", num
);
2195 tsv
->getter
= getter
;
2198 /* Add a raw traceframe for the given tracepoint. */
2200 static struct traceframe
*
2201 add_traceframe (struct tracepoint
*tpoint
)
2203 struct traceframe
*tframe
;
2205 tframe
= trace_buffer_alloc (sizeof (struct traceframe
));
2210 tframe
->tpnum
= tpoint
->number
;
2211 tframe
->data_size
= 0;
2216 /* Add a block to the traceframe currently being worked on. */
2218 static unsigned char *
2219 add_traceframe_block (struct traceframe
*tframe
, int amt
)
2221 unsigned char *block
;
2226 block
= trace_buffer_alloc (amt
);
2231 tframe
->data_size
+= amt
;
2236 /* Flag that the current traceframe is finished. */
2239 finish_traceframe (struct traceframe
*tframe
)
2241 ++traceframe_write_count
;
2242 ++traceframes_created
;
2245 #ifndef IN_PROCESS_AGENT
2247 /* Given a traceframe number NUM, find the NUMth traceframe in the
2250 static struct traceframe
*
2251 find_traceframe (int num
)
2253 struct traceframe
*tframe
;
2256 for (tframe
= FIRST_TRACEFRAME ();
2258 tframe
= NEXT_TRACEFRAME (tframe
))
2269 get_traceframe_address (struct traceframe
*tframe
)
2272 struct tracepoint
*tpoint
;
2274 addr
= traceframe_get_pc (tframe
);
2279 /* Fallback strategy, will be incorrect for while-stepping frames
2280 and multi-location tracepoints. */
2281 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2282 return tpoint
->address
;
2285 /* Search for the next traceframe whose address is inside or outside
2288 static struct traceframe
*
2289 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2292 struct traceframe
*tframe
;
2295 *tfnump
= current_traceframe
+ 1;
2296 tframe
= find_traceframe (*tfnump
);
2297 /* The search is not supposed to wrap around. */
2304 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2306 tfaddr
= get_traceframe_address (tframe
);
2308 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2309 : (lo
> tfaddr
|| tfaddr
> hi
))
2318 /* Search for the next traceframe recorded by the given tracepoint.
2319 Note that for multi-location tracepoints, this will find whatever
2320 location appears first. */
2322 static struct traceframe
*
2323 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2325 struct traceframe
*tframe
;
2327 *tfnump
= current_traceframe
+ 1;
2328 tframe
= find_traceframe (*tfnump
);
2329 /* The search is not supposed to wrap around. */
2336 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2338 if (tframe
->tpnum
== num
)
2349 #ifndef IN_PROCESS_AGENT
2351 /* Clear all past trace state. */
2354 cmd_qtinit (char *packet
)
2356 struct trace_state_variable
*tsv
, *prev
, *next
;
2358 /* Make sure we don't try to read from a trace frame. */
2359 current_traceframe
= -1;
2361 trace_debug ("Initializing the trace");
2363 clear_installed_tracepoints ();
2364 clear_readonly_regions ();
2367 last_tracepoint
= NULL
;
2369 /* Clear out any leftover trace state variables. Ones with target
2370 defined getters should be kept however. */
2372 tsv
= trace_state_variables
;
2375 trace_debug ("Looking at var %d", tsv
->number
);
2376 if (tsv
->getter
== NULL
)
2382 trace_state_variables
= next
;
2383 trace_debug ("Deleting var %d", tsv
->number
);
2394 clear_trace_buffer ();
2395 clear_inferior_trace_buffer ();
2400 /* Unprobe the UST marker at ADDRESS. */
2403 unprobe_marker_at (CORE_ADDR address
)
2405 char cmd
[IPA_CMD_BUF_SIZE
];
2407 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2408 run_inferior_command (cmd
, strlen (cmd
) + 1);
2411 /* Restore the program to its pre-tracing state. This routine may be called
2412 in error situations, so it needs to be careful about only restoring
2413 from known-valid bits. */
2416 clear_installed_tracepoints (void)
2418 struct tracepoint
*tpoint
;
2419 struct tracepoint
*prev_stpoint
;
2422 cancel_breakpoints ();
2424 prev_stpoint
= NULL
;
2426 /* Restore any bytes overwritten by tracepoints. */
2427 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2429 /* Catch the case where we might try to remove a tracepoint that
2430 was never actually installed. */
2431 if (tpoint
->handle
== NULL
)
2433 trace_debug ("Tracepoint %d at 0x%s was "
2434 "never installed, nothing to clear",
2435 tpoint
->number
, paddress (tpoint
->address
));
2439 switch (tpoint
->type
)
2441 case trap_tracepoint
:
2442 delete_breakpoint (tpoint
->handle
);
2444 case fast_tracepoint
:
2445 delete_fast_tracepoint_jump (tpoint
->handle
);
2447 case static_tracepoint
:
2448 if (prev_stpoint
!= NULL
2449 && prev_stpoint
->address
== tpoint
->address
)
2450 /* Nothing to do. We already unprobed a tracepoint set at
2451 this marker address (and there can only be one probe
2456 unprobe_marker_at (tpoint
->address
);
2457 prev_stpoint
= tpoint
;
2462 tpoint
->handle
= NULL
;
2468 /* Parse a packet that defines a tracepoint. */
2471 cmd_qtdp (char *own_buf
)
2474 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2475 int trail_hyphen
= 0;
2479 struct tracepoint
*tpoint
;
2481 char *packet
= own_buf
;
2483 packet
+= strlen ("QTDP:");
2485 /* A hyphen at the beginning marks a packet specifying actions for a
2486 tracepoint already supplied. */
2493 packet
= unpack_varlen_hex (packet
, &num
);
2494 ++packet
; /* skip a colon */
2495 packet
= unpack_varlen_hex (packet
, &addr
);
2496 ++packet
; /* skip a colon */
2498 /* See if we already have this tracepoint. */
2499 tpoint
= find_tracepoint (num
, addr
);
2503 /* Duplicate tracepoints are never allowed. */
2506 trace_debug ("Tracepoint error: tracepoint %d"
2507 " at 0x%s already exists",
2508 (int) num
, paddress (addr
));
2509 write_enn (own_buf
);
2513 tpoint
= add_tracepoint (num
, addr
);
2515 tpoint
->enabled
= (*packet
== 'E');
2516 ++packet
; /* skip 'E' */
2517 ++packet
; /* skip a colon */
2518 packet
= unpack_varlen_hex (packet
, &count
);
2519 tpoint
->step_count
= count
;
2520 ++packet
; /* skip a colon */
2521 packet
= unpack_varlen_hex (packet
, &count
);
2522 tpoint
->pass_count
= count
;
2523 /* See if we have any of the additional optional fields. */
2524 while (*packet
== ':')
2529 tpoint
->type
= fast_tracepoint
;
2531 packet
= unpack_varlen_hex (packet
, &count
);
2532 tpoint
->orig_size
= count
;
2534 else if (*packet
== 'S')
2536 tpoint
->type
= static_tracepoint
;
2539 else if (*packet
== 'X')
2541 actparm
= (char *) packet
;
2542 tpoint
->cond
= gdb_parse_agent_expr (&actparm
);
2545 else if (*packet
== '-')
2547 else if (*packet
== '\0')
2550 trace_debug ("Unknown optional tracepoint field");
2555 trace_debug ("Also has actions\n");
2558 trace_debug ("Defined %stracepoint %d at 0x%s, "
2559 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2560 tpoint
->type
== fast_tracepoint
? "fast "
2561 : tpoint
->type
== static_tracepoint
? "static " : "",
2562 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2563 tpoint
->step_count
, tpoint
->pass_count
);
2566 add_tracepoint_action (tpoint
, packet
);
2569 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2570 (int) num
, paddress (addr
));
2571 write_enn (own_buf
);
2575 /* Install tracepoint during tracing only once for each tracepoint location.
2576 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2577 determine the last QTDP packet for one tracepoint location by checking
2578 trailing hyphen in QTDP packet. */
2579 if (tracing
&& !trail_hyphen
)
2581 struct tracepoint
*tp
= NULL
;
2583 /* Pause all threads temporarily while we patch tracepoints. */
2586 /* download_tracepoint will update global `tracepoints'
2587 list, so it is unsafe to leave threads in jump pad. */
2588 stabilize_threads ();
2590 /* Freeze threads. */
2594 if (tpoint
->type
!= trap_tracepoint
)
2596 /* Find another fast or static tracepoint at the same address. */
2597 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2599 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2600 && tp
->number
!= tpoint
->number
)
2604 /* TPOINT is installed at the same address as TP. */
2607 if (tpoint
->type
== fast_tracepoint
)
2608 clone_fast_tracepoint (tpoint
, tp
);
2609 else if (tpoint
->type
== static_tracepoint
)
2610 tpoint
->handle
= (void *) -1;
2614 if (use_agent
&& tpoint
->type
== fast_tracepoint
2615 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2617 /* Download and install fast tracepoint by agent. */
2618 if (tracepoint_send_agent (tpoint
) == 0)
2622 write_enn (own_buf
);
2623 remove_tracepoint (tpoint
);
2628 download_tracepoint (tpoint
);
2630 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2632 install_tracepoint (tpoint
, own_buf
);
2633 if (strcmp (own_buf
, "OK") != 0)
2634 remove_tracepoint (tpoint
);
2648 cmd_qtdpsrc (char *own_buf
)
2650 ULONGEST num
, addr
, start
, slen
;
2651 struct tracepoint
*tpoint
;
2652 char *packet
= own_buf
;
2653 char *saved
, *srctype
, *src
;
2655 struct source_string
*last
, *newlast
;
2657 packet
+= strlen ("QTDPsrc:");
2659 packet
= unpack_varlen_hex (packet
, &num
);
2660 ++packet
; /* skip a colon */
2661 packet
= unpack_varlen_hex (packet
, &addr
);
2662 ++packet
; /* skip a colon */
2664 /* See if we already have this tracepoint. */
2665 tpoint
= find_tracepoint (num
, addr
);
2669 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2670 (int) num
, paddress (addr
));
2671 write_enn (own_buf
);
2676 packet
= strchr (packet
, ':');
2677 srctype
= xmalloc (packet
- saved
+ 1);
2678 memcpy (srctype
, saved
, packet
- saved
);
2679 srctype
[packet
- saved
] = '\0';
2681 packet
= unpack_varlen_hex (packet
, &start
);
2682 ++packet
; /* skip a colon */
2683 packet
= unpack_varlen_hex (packet
, &slen
);
2684 ++packet
; /* skip a colon */
2685 src
= xmalloc (slen
+ 1);
2686 nbytes
= unhexify (src
, packet
, strlen (packet
) / 2);
2689 newlast
= xmalloc (sizeof (struct source_string
));
2690 newlast
->type
= srctype
;
2692 newlast
->next
= NULL
;
2693 /* Always add a source string to the end of the list;
2694 this keeps sequences of actions/commands in the right
2696 if (tpoint
->source_strings
)
2698 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2700 last
->next
= newlast
;
2703 tpoint
->source_strings
= newlast
;
2709 cmd_qtdv (char *own_buf
)
2711 ULONGEST num
, val
, builtin
;
2714 struct trace_state_variable
*tsv
;
2715 char *packet
= own_buf
;
2717 packet
+= strlen ("QTDV:");
2719 packet
= unpack_varlen_hex (packet
, &num
);
2720 ++packet
; /* skip a colon */
2721 packet
= unpack_varlen_hex (packet
, &val
);
2722 ++packet
; /* skip a colon */
2723 packet
= unpack_varlen_hex (packet
, &builtin
);
2724 ++packet
; /* skip a colon */
2726 nbytes
= strlen (packet
) / 2;
2727 varname
= xmalloc (nbytes
+ 1);
2728 nbytes
= unhexify (varname
, packet
, nbytes
);
2729 varname
[nbytes
] = '\0';
2731 tsv
= create_trace_state_variable (num
, 1);
2732 tsv
->initial_value
= (LONGEST
) val
;
2733 tsv
->name
= varname
;
2735 set_trace_state_variable_value (num
, (LONGEST
) val
);
2741 cmd_qtenable_disable (char *own_buf
, int enable
)
2743 char *packet
= own_buf
;
2745 struct tracepoint
*tp
;
2747 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2748 packet
= unpack_varlen_hex (packet
, &num
);
2749 ++packet
; /* skip a colon */
2750 packet
= unpack_varlen_hex (packet
, &addr
);
2752 tp
= find_tracepoint (num
, addr
);
2756 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2758 trace_debug ("Tracepoint %d at 0x%s is already %s",
2759 (int) num
, paddress (addr
),
2760 enable
? "enabled" : "disabled");
2765 trace_debug ("%s tracepoint %d at 0x%s",
2766 enable
? "Enabling" : "Disabling",
2767 (int) num
, paddress (addr
));
2769 tp
->enabled
= enable
;
2771 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2774 int offset
= offsetof (struct tracepoint
, enabled
);
2775 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2777 ret
= prepare_to_access_memory ();
2780 trace_debug ("Failed to temporarily stop inferior threads");
2781 write_enn (own_buf
);
2785 ret
= write_inferior_integer (obj_addr
, enable
);
2786 done_accessing_memory ();
2790 trace_debug ("Cannot write enabled flag into "
2791 "inferior process memory");
2792 write_enn (own_buf
);
2801 trace_debug ("Tracepoint %d at 0x%s not found",
2802 (int) num
, paddress (addr
));
2803 write_enn (own_buf
);
2808 cmd_qtv (char *own_buf
)
2813 char *packet
= own_buf
;
2815 packet
+= strlen ("qTV:");
2816 unpack_varlen_hex (packet
, &num
);
2818 if (current_traceframe
>= 0)
2820 err
= traceframe_read_tsv ((int) num
, &val
);
2823 strcpy (own_buf
, "U");
2827 /* Only make tsv's be undefined before the first trace run. After a
2828 trace run is over, the user might want to see the last value of
2829 the tsv, and it might not be available in a traceframe. */
2830 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2832 strcpy (own_buf
, "U");
2836 val
= get_trace_state_variable_value (num
);
2838 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2841 /* Clear out the list of readonly regions. */
2844 clear_readonly_regions (void)
2846 struct readonly_region
*roreg
;
2848 while (readonly_regions
)
2850 roreg
= readonly_regions
;
2851 readonly_regions
= readonly_regions
->next
;
2856 /* Parse the collection of address ranges whose contents GDB believes
2857 to be unchanging and so can be read directly from target memory
2858 even while looking at a traceframe. */
2861 cmd_qtro (char *own_buf
)
2863 ULONGEST start
, end
;
2864 struct readonly_region
*roreg
;
2865 char *packet
= own_buf
;
2867 trace_debug ("Want to mark readonly regions");
2869 clear_readonly_regions ();
2871 packet
+= strlen ("QTro");
2873 while (*packet
== ':')
2875 ++packet
; /* skip a colon */
2876 packet
= unpack_varlen_hex (packet
, &start
);
2877 ++packet
; /* skip a comma */
2878 packet
= unpack_varlen_hex (packet
, &end
);
2879 roreg
= xmalloc (sizeof (struct readonly_region
));
2880 roreg
->start
= start
;
2882 roreg
->next
= readonly_regions
;
2883 readonly_regions
= roreg
;
2884 trace_debug ("Added readonly region from 0x%s to 0x%s",
2885 paddress (roreg
->start
), paddress (roreg
->end
));
2891 /* Test to see if the given range is in our list of readonly ranges.
2892 We only test for being entirely within a range, GDB is not going to
2893 send a single memory packet that spans multiple regions. */
2896 in_readonly_region (CORE_ADDR addr
, ULONGEST length
)
2898 struct readonly_region
*roreg
;
2900 for (roreg
= readonly_regions
; roreg
; roreg
= roreg
->next
)
2901 if (roreg
->start
<= addr
&& (addr
+ length
- 1) <= roreg
->end
)
2907 /* The maximum size of a jump pad entry. */
2908 static const int max_jump_pad_size
= 0x100;
2910 static CORE_ADDR gdb_jump_pad_head
;
2912 /* Return the address of the next free jump space. */
2915 get_jump_space_head (void)
2917 if (gdb_jump_pad_head
== 0)
2919 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2920 &gdb_jump_pad_head
))
2921 fatal ("error extracting jump_pad_buffer");
2924 return gdb_jump_pad_head
;
2927 /* Reserve USED bytes from the jump space. */
2930 claim_jump_space (ULONGEST used
)
2932 trace_debug ("claim_jump_space reserves %s bytes at %s",
2933 pulongest (used
), paddress (gdb_jump_pad_head
));
2934 gdb_jump_pad_head
+= used
;
2937 static CORE_ADDR trampoline_buffer_head
= 0;
2938 static CORE_ADDR trampoline_buffer_tail
;
2940 /* Reserve USED bytes from the trampoline buffer and return the
2941 address of the start of the reserved space in TRAMPOLINE. Returns
2942 non-zero if the space is successfully claimed. */
2945 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2947 if (!trampoline_buffer_head
)
2949 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2950 &trampoline_buffer_tail
))
2952 fatal ("error extracting trampoline_buffer");
2956 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2957 &trampoline_buffer_head
))
2959 fatal ("error extracting trampoline_buffer_end");
2964 /* Start claiming space from the top of the trampoline space. If
2965 the space is located at the bottom of the virtual address space,
2966 this reduces the possibility that corruption will occur if a null
2967 pointer is used to write to memory. */
2968 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2970 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2975 trampoline_buffer_head
-= used
;
2977 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2978 pulongest (used
), paddress (trampoline_buffer_head
));
2980 *trampoline
= trampoline_buffer_head
;
2984 /* Returns non-zero if there is space allocated for use in trampolines
2985 for fast tracepoints. */
2988 have_fast_tracepoint_trampoline_buffer (char *buf
)
2990 CORE_ADDR trampoline_end
, errbuf
;
2992 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2995 fatal ("error extracting trampoline_buffer_end");
3002 strcpy (buf
, "was claiming");
3003 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3006 fatal ("error extracting errbuf");
3010 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3013 return trampoline_end
!= 0;
3016 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3017 the command fails, or 0 otherwise. If the command ran
3018 successfully, but probing the marker failed, ERROUT will be filled
3019 with the error to reply to GDB, and -1 is also returned. This
3020 allows directly passing IPA errors to GDB. */
3023 probe_marker_at (CORE_ADDR address
, char *errout
)
3025 char cmd
[IPA_CMD_BUF_SIZE
];
3028 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3029 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3035 strcpy (errout
, cmd
);
3044 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3046 to
->jump_pad
= from
->jump_pad
;
3047 to
->jump_pad_end
= from
->jump_pad_end
;
3048 to
->trampoline
= from
->trampoline
;
3049 to
->trampoline_end
= from
->trampoline_end
;
3050 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3051 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3052 to
->handle
= from
->handle
;
3054 gdb_assert (from
->handle
);
3055 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3058 #define MAX_JUMP_SIZE 20
3060 /* Install fast tracepoint. Return 0 if successful, otherwise return
3064 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3066 CORE_ADDR jentry
, jump_entry
;
3067 CORE_ADDR trampoline
;
3068 ULONGEST trampoline_size
;
3070 /* The jump to the jump pad of the last fast tracepoint
3072 unsigned char fjump
[MAX_JUMP_SIZE
];
3073 ULONGEST fjump_size
;
3075 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3077 trace_debug ("Requested a fast tracepoint on an instruction "
3078 "that is of less than the minimum length.");
3082 jentry
= jump_entry
= get_jump_space_head ();
3085 trampoline_size
= 0;
3087 /* Install the jump pad. */
3088 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3090 ipa_sym_addrs
.addr_gdb_collect
,
3091 ipa_sym_addrs
.addr_collecting
,
3094 &trampoline
, &trampoline_size
,
3096 &tpoint
->adjusted_insn_addr
,
3097 &tpoint
->adjusted_insn_addr_end
,
3104 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3107 if (tpoint
->handle
!= NULL
)
3109 tpoint
->jump_pad
= jump_entry
;
3110 tpoint
->jump_pad_end
= jentry
;
3111 tpoint
->trampoline
= trampoline
;
3112 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3114 /* Pad to 8-byte alignment. */
3115 jentry
= ((jentry
+ 7) & ~0x7);
3116 claim_jump_space (jentry
- jump_entry
);
3123 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3126 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3128 tpoint
->handle
= NULL
;
3131 if (tpoint
->type
== trap_tracepoint
)
3133 /* Tracepoints are installed as memory breakpoints. Just go
3134 ahead and install the trap. The breakpoints module
3135 handles duplicated breakpoints, and the memory read
3136 routine handles un-patching traps from memory reads. */
3137 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3138 tracepoint_handler
);
3140 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3142 if (!agent_loaded_p ())
3144 trace_debug ("Requested a %s tracepoint, but fast "
3145 "tracepoints aren't supported.",
3146 tpoint
->type
== static_tracepoint
? "static" : "fast");
3147 write_e_ipa_not_loaded (own_buf
);
3150 if (tpoint
->type
== static_tracepoint
3151 && !in_process_agent_supports_ust ())
3153 trace_debug ("Requested a static tracepoint, but static "
3154 "tracepoints are not supported.");
3155 write_e_ust_not_loaded (own_buf
);
3159 if (tpoint
->type
== fast_tracepoint
)
3160 install_fast_tracepoint (tpoint
, own_buf
);
3163 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3164 tpoint
->handle
= (void *) -1;
3169 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3171 if (tpoint
->handle
== NULL
)
3173 if (*own_buf
== '\0')
3174 write_enn (own_buf
);
3180 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3183 cmd_qtstart (char *packet
)
3185 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3186 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3188 trace_debug ("Starting the trace");
3190 /* Pause all threads temporarily while we patch tracepoints. */
3193 /* Get threads out of jump pads. Safe to do here, since this is a
3194 top level command. And, required to do here, since we're
3195 deleting/rewriting jump pads. */
3197 stabilize_threads ();
3199 /* Freeze threads. */
3202 /* Sync the fast tracepoints list in the inferior ftlib. */
3203 if (agent_loaded_p ())
3204 download_trace_state_variables ();
3206 /* No previous fast tpoint yet. */
3207 prev_ftpoint
= NULL
;
3209 /* No previous static tpoint yet. */
3210 prev_stpoint
= NULL
;
3214 /* Start out empty. */
3215 if (agent_loaded_p ())
3216 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, 0);
3218 /* Download and install tracepoints. */
3219 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3221 /* Ensure all the hit counts start at zero. */
3222 tpoint
->hit_count
= 0;
3223 tpoint
->traceframe_usage
= 0;
3225 if (tpoint
->type
== trap_tracepoint
)
3227 /* Tracepoints are installed as memory breakpoints. Just go
3228 ahead and install the trap. The breakpoints module
3229 handles duplicated breakpoints, and the memory read
3230 routine handles un-patching traps from memory reads. */
3231 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3232 tracepoint_handler
);
3234 else if (tpoint
->type
== fast_tracepoint
3235 || tpoint
->type
== static_tracepoint
)
3237 if (maybe_write_ipa_not_loaded (packet
))
3239 trace_debug ("Requested a %s tracepoint, but fast "
3240 "tracepoints aren't supported.",
3241 tpoint
->type
== static_tracepoint
3242 ? "static" : "fast");
3246 if (tpoint
->type
== fast_tracepoint
)
3249 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3251 if (prev_ftpoint
!= NULL
3252 && prev_ftpoint
->address
== tpoint
->address
)
3255 tracepoint_send_agent (tpoint
);
3257 download_tracepoint_1 (tpoint
);
3259 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3263 /* Tracepoint is installed successfully? */
3266 /* Download and install fast tracepoint by agent. */
3268 installed
= !tracepoint_send_agent (tpoint
);
3271 download_tracepoint_1 (tpoint
);
3272 installed
= !install_fast_tracepoint (tpoint
, packet
);
3276 prev_ftpoint
= tpoint
;
3281 if (!in_process_agent_supports_ust ())
3283 trace_debug ("Requested a static tracepoint, but static "
3284 "tracepoints are not supported.");
3288 download_tracepoint_1 (tpoint
);
3289 /* Can only probe a given marker once. */
3290 if (prev_stpoint
!= NULL
3291 && prev_stpoint
->address
== tpoint
->address
)
3292 tpoint
->handle
= (void *) -1;
3295 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3297 tpoint
->handle
= (void *) -1;
3299 /* So that we can handle multiple static tracepoints
3300 at the same address easily. */
3301 prev_stpoint
= tpoint
;
3307 tpptr
= tpoint
->obj_addr_on_target
;
3309 if (tpoint
== tracepoints
)
3310 /* First object in list, set the head pointer in the
3312 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3314 write_inferior_data_ptr (prev_tpptr
+ offsetof (struct tracepoint
,
3319 /* Any failure in the inner loop is sufficient cause to give
3321 if (tpoint
->handle
== NULL
)
3325 /* Any error in tracepoint insertion is unacceptable; better to
3326 address the problem now, than end up with a useless or misleading
3330 clear_installed_tracepoints ();
3331 if (*packet
== '\0')
3337 stopping_tracepoint
= NULL
;
3338 trace_buffer_is_full
= 0;
3339 expr_eval_result
= expr_eval_no_error
;
3340 error_tracepoint
= NULL
;
3341 tracing_start_time
= get_timestamp ();
3343 /* Tracing is now active, hits will now start being logged. */
3346 if (agent_loaded_p ())
3348 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3349 fatal ("Error setting tracing variable in lib");
3351 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3353 fatal ("Error clearing stopping_tracepoint variable in lib");
3355 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3356 fatal ("Error clearing trace_buffer_is_full variable in lib");
3358 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3359 stop_tracing_handler
);
3360 if (stop_tracing_bkpt
== NULL
)
3361 error ("Error setting stop_tracing breakpoint");
3363 flush_trace_buffer_bkpt
3364 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3365 flush_trace_buffer_handler
);
3366 if (flush_trace_buffer_bkpt
== NULL
)
3367 error ("Error setting flush_trace_buffer breakpoint");
3375 /* End a tracing run, filling in a stop reason to report back to GDB,
3376 and removing the tracepoints from the code. */
3383 trace_debug ("Tracing is already off, ignoring");
3387 trace_debug ("Stopping the trace");
3389 /* Pause all threads before removing fast jumps from memory,
3390 breakpoints, and touching IPA state variables (inferior memory).
3391 Some thread may hit the internal tracing breakpoints, or be
3392 collecting this moment, but that's ok, we don't release the
3393 tpoint object's memory or the jump pads here (we only do that
3394 when we're sure we can move all threads out of the jump pads).
3395 We can't now, since we may be getting here due to the inferior
3396 agent calling us. */
3398 /* Since we're removing breakpoints, cancel breakpoint hits,
3399 possibly related to the breakpoints we're about to delete. */
3400 cancel_breakpoints ();
3402 /* Stop logging. Tracepoints can still be hit, but they will not be
3405 if (agent_loaded_p ())
3407 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3408 fatal ("Error clearing tracing variable in lib");
3411 tracing_stop_time
= get_timestamp ();
3412 tracing_stop_reason
= "t???";
3413 tracing_stop_tpnum
= 0;
3414 if (stopping_tracepoint
)
3416 trace_debug ("Stopping the trace because "
3417 "tracepoint %d was hit %" PRIu64
" times",
3418 stopping_tracepoint
->number
,
3419 stopping_tracepoint
->pass_count
);
3420 tracing_stop_reason
= "tpasscount";
3421 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3423 else if (trace_buffer_is_full
)
3425 trace_debug ("Stopping the trace because the trace buffer is full");
3426 tracing_stop_reason
= "tfull";
3428 else if (expr_eval_result
!= expr_eval_no_error
)
3430 trace_debug ("Stopping the trace because of an expression eval error");
3431 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3432 tracing_stop_tpnum
= error_tracepoint
->number
;
3434 #ifndef IN_PROCESS_AGENT
3435 else if (!gdb_connected ())
3437 trace_debug ("Stopping the trace because GDB disconnected");
3438 tracing_stop_reason
= "tdisconnected";
3443 trace_debug ("Stopping the trace because of a tstop command");
3444 tracing_stop_reason
= "tstop";
3447 stopping_tracepoint
= NULL
;
3448 error_tracepoint
= NULL
;
3450 /* Clear out the tracepoints. */
3451 clear_installed_tracepoints ();
3453 if (agent_loaded_p ())
3455 /* Pull in fast tracepoint trace frames from the inferior lib
3456 buffer into our buffer, even if our buffer is already full,
3457 because we want to present the full number of created frames
3458 in addition to what fit in the trace buffer. */
3459 upload_fast_traceframes ();
3462 if (stop_tracing_bkpt
!= NULL
)
3464 delete_breakpoint (stop_tracing_bkpt
);
3465 stop_tracing_bkpt
= NULL
;
3468 if (flush_trace_buffer_bkpt
!= NULL
)
3470 delete_breakpoint (flush_trace_buffer_bkpt
);
3471 flush_trace_buffer_bkpt
= NULL
;
3478 stop_tracing_handler (CORE_ADDR addr
)
3480 trace_debug ("lib hit stop_tracing");
3482 /* Don't actually handle it here. When we stop tracing we remove
3483 breakpoints from the inferior, and that is not allowed in a
3484 breakpoint handler (as the caller is walking the breakpoint
3490 flush_trace_buffer_handler (CORE_ADDR addr
)
3492 trace_debug ("lib hit flush_trace_buffer");
3497 cmd_qtstop (char *packet
)
3504 cmd_qtdisconnected (char *own_buf
)
3507 char *packet
= own_buf
;
3509 packet
+= strlen ("QTDisconnected:");
3511 unpack_varlen_hex (packet
, &setting
);
3515 disconnected_tracing
= setting
;
3519 cmd_qtframe (char *own_buf
)
3521 ULONGEST frame
, pc
, lo
, hi
, num
;
3523 struct traceframe
*tframe
;
3524 char *packet
= own_buf
;
3526 packet
+= strlen ("QTFrame:");
3528 if (strncmp (packet
, "pc:", strlen ("pc:")) == 0)
3530 packet
+= strlen ("pc:");
3531 unpack_varlen_hex (packet
, &pc
);
3532 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3533 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3535 else if (strncmp (packet
, "range:", strlen ("range:")) == 0)
3537 packet
+= strlen ("range:");
3538 packet
= unpack_varlen_hex (packet
, &lo
);
3540 unpack_varlen_hex (packet
, &hi
);
3541 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3542 paddress (lo
), paddress (hi
));
3543 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3545 else if (strncmp (packet
, "outside:", strlen ("outside:")) == 0)
3547 packet
+= strlen ("outside:");
3548 packet
= unpack_varlen_hex (packet
, &lo
);
3550 unpack_varlen_hex (packet
, &hi
);
3551 trace_debug ("Want to find next traceframe "
3552 "outside the range 0x%s to 0x%s",
3553 paddress (lo
), paddress (hi
));
3554 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3556 else if (strncmp (packet
, "tdp:", strlen ("tdp:")) == 0)
3558 packet
+= strlen ("tdp:");
3559 unpack_varlen_hex (packet
, &num
);
3561 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3562 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3566 unpack_varlen_hex (packet
, &frame
);
3567 tfnum
= (int) frame
;
3570 trace_debug ("Want to stop looking at traceframes");
3571 current_traceframe
= -1;
3575 trace_debug ("Want to look at traceframe %d", tfnum
);
3576 tframe
= find_traceframe (tfnum
);
3581 current_traceframe
= tfnum
;
3582 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3585 sprintf (own_buf
, "F-1");
3589 cmd_qtstatus (char *packet
)
3591 char *stop_reason_rsp
= NULL
;
3592 char *buf1
, *buf2
, *buf3
, *str
;
3595 /* Translate the plain text of the notes back into hex for
3598 str
= (tracing_user_name
? tracing_user_name
: "");
3599 slen
= strlen (str
);
3600 buf1
= (char *) alloca (slen
* 2 + 1);
3601 hexify (buf1
, str
, slen
);
3603 str
= (tracing_notes
? tracing_notes
: "");
3604 slen
= strlen (str
);
3605 buf2
= (char *) alloca (slen
* 2 + 1);
3606 hexify (buf2
, str
, slen
);
3608 str
= (tracing_stop_note
? tracing_stop_note
: "");
3609 slen
= strlen (str
);
3610 buf3
= (char *) alloca (slen
* 2 + 1);
3611 hexify (buf3
, str
, slen
);
3613 trace_debug ("Returning trace status as %d, stop reason %s",
3614 tracing
, tracing_stop_reason
);
3616 if (agent_loaded_p ())
3620 upload_fast_traceframes ();
3625 stop_reason_rsp
= (char *) tracing_stop_reason
;
3627 /* The user visible error string in terror needs to be hex encoded.
3628 We leave it as plain string in `tracing_stop_reason' to ease
3630 if (strncmp (stop_reason_rsp
, "terror:", strlen ("terror:")) == 0)
3632 const char *result_name
;
3636 result_name
= stop_reason_rsp
+ strlen ("terror:");
3637 hexstr_len
= strlen (result_name
) * 2;
3638 p
= stop_reason_rsp
= alloca (strlen ("terror:") + hexstr_len
+ 1);
3639 strcpy (p
, "terror:");
3641 convert_int_to_ascii ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3644 /* If this was a forced stop, include any stop note that was supplied. */
3645 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3647 stop_reason_rsp
= alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3648 strcpy (stop_reason_rsp
, "tstop:");
3649 strcat (stop_reason_rsp
, buf3
);
3655 "tframes:%x;tcreated:%x;"
3656 "tfree:%x;tsize:%s;"
3659 "starttime:%s;stoptime:%s;"
3660 "username:%s:;notes:%s:",
3662 stop_reason_rsp
, tracing_stop_tpnum
,
3663 traceframe_count
, traceframes_created
,
3664 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3665 circular_trace_buffer
,
3666 disconnected_tracing
,
3667 plongest (tracing_start_time
), plongest (tracing_stop_time
),
3672 cmd_qtp (char *own_buf
)
3675 struct tracepoint
*tpoint
;
3676 char *packet
= own_buf
;
3678 packet
+= strlen ("qTP:");
3680 packet
= unpack_varlen_hex (packet
, &num
);
3681 ++packet
; /* skip a colon */
3682 packet
= unpack_varlen_hex (packet
, &addr
);
3684 /* See if we already have this tracepoint. */
3685 tpoint
= find_tracepoint (num
, addr
);
3689 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3690 (int) num
, paddress (addr
));
3691 write_enn (own_buf
);
3695 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3696 tpoint
->traceframe_usage
);
3699 /* State variables to help return all the tracepoint bits. */
3700 static struct tracepoint
*cur_tpoint
;
3701 static int cur_action
;
3702 static int cur_step_action
;
3703 static struct source_string
*cur_source_string
;
3704 static struct trace_state_variable
*cur_tsv
;
3706 /* Compose a response that is an imitation of the syntax by which the
3707 tracepoint was originally downloaded. */
3710 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3714 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3715 paddress (tpoint
->address
),
3716 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3717 tpoint
->pass_count
);
3718 if (tpoint
->type
== fast_tracepoint
)
3719 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3720 else if (tpoint
->type
== static_tracepoint
)
3721 sprintf (packet
+ strlen (packet
), ":S");
3725 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3726 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3727 tpoint
->cond
->length
, buf
);
3732 /* Compose a response that is an imitation of the syntax by which the
3733 tracepoint action was originally downloaded (with the difference
3734 that due to the way we store the actions, this will output a packet
3735 per action, while GDB could have combined more than one action
3739 response_action (char *packet
, struct tracepoint
*tpoint
,
3740 char *taction
, int step
)
3742 sprintf (packet
, "%c%x:%s:%s",
3743 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3747 /* Compose a response that is an imitation of the syntax by which the
3748 tracepoint source piece was originally downloaded. */
3751 response_source (char *packet
,
3752 struct tracepoint
*tpoint
, struct source_string
*src
)
3757 len
= strlen (src
->str
);
3758 buf
= alloca (len
* 2 + 1);
3759 convert_int_to_ascii ((gdb_byte
*) src
->str
, buf
, len
);
3761 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3762 tpoint
->number
, paddress (tpoint
->address
),
3763 src
->type
, 0, len
, buf
);
3766 /* Return the first piece of tracepoint definition, and initialize the
3767 state machine that will iterate through all the tracepoint
3771 cmd_qtfp (char *packet
)
3773 trace_debug ("Returning first tracepoint definition piece");
3775 cur_tpoint
= tracepoints
;
3776 cur_action
= cur_step_action
= -1;
3777 cur_source_string
= NULL
;
3780 response_tracepoint (packet
, cur_tpoint
);
3782 strcpy (packet
, "l");
3785 /* Return additional pieces of tracepoint definition. Each action and
3786 stepping action must go into its own packet, because of packet size
3787 limits, and so we use state variables to deliver one piece at a
3791 cmd_qtsp (char *packet
)
3793 trace_debug ("Returning subsequent tracepoint definition piece");
3797 /* This case would normally never occur, but be prepared for
3799 strcpy (packet
, "l");
3801 else if (cur_action
< cur_tpoint
->numactions
- 1)
3804 response_action (packet
, cur_tpoint
,
3805 cur_tpoint
->actions_str
[cur_action
], 0);
3807 else if (cur_step_action
< cur_tpoint
->num_step_actions
- 1)
3810 response_action (packet
, cur_tpoint
,
3811 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3813 else if ((cur_source_string
3814 ? cur_source_string
->next
3815 : cur_tpoint
->source_strings
))
3817 if (cur_source_string
)
3818 cur_source_string
= cur_source_string
->next
;
3820 cur_source_string
= cur_tpoint
->source_strings
;
3821 response_source (packet
, cur_tpoint
, cur_source_string
);
3825 cur_tpoint
= cur_tpoint
->next
;
3826 cur_action
= cur_step_action
= -1;
3827 cur_source_string
= NULL
;
3829 response_tracepoint (packet
, cur_tpoint
);
3831 strcpy (packet
, "l");
3835 /* Compose a response that is an imitation of the syntax by which the
3836 trace state variable was originally downloaded. */
3839 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3841 char *buf
= (char *) "";
3846 namelen
= strlen (tsv
->name
);
3847 buf
= alloca (namelen
* 2 + 1);
3848 convert_int_to_ascii ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3851 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3852 tsv
->getter
? 1 : 0, buf
);
3855 /* Return the first trace state variable definition, and initialize
3856 the state machine that will iterate through all the tsv bits. */
3859 cmd_qtfv (char *packet
)
3861 trace_debug ("Returning first trace state variable definition");
3863 cur_tsv
= trace_state_variables
;
3866 response_tsv (packet
, cur_tsv
);
3868 strcpy (packet
, "l");
3871 /* Return additional trace state variable definitions. */
3874 cmd_qtsv (char *packet
)
3876 trace_debug ("Returning additional trace state variable definition");
3880 cur_tsv
= cur_tsv
->next
;
3882 response_tsv (packet
, cur_tsv
);
3884 strcpy (packet
, "l");
3887 strcpy (packet
, "l");
3890 /* Return the first static tracepoint marker, and initialize the state
3891 machine that will iterate through all the static tracepoints
3895 cmd_qtfstm (char *packet
)
3897 if (!maybe_write_ipa_ust_not_loaded (packet
))
3898 run_inferior_command (packet
, strlen (packet
) + 1);
3901 /* Return additional static tracepoints markers. */
3904 cmd_qtsstm (char *packet
)
3906 if (!maybe_write_ipa_ust_not_loaded (packet
))
3907 run_inferior_command (packet
, strlen (packet
) + 1);
3910 /* Return the definition of the static tracepoint at a given address.
3911 Result packet is the same as qTsST's. */
3914 cmd_qtstmat (char *packet
)
3916 if (!maybe_write_ipa_ust_not_loaded (packet
))
3917 run_inferior_command (packet
, strlen (packet
) + 1);
3920 /* Sent the agent a command to close it. */
3923 gdb_agent_about_to_close (int pid
)
3925 char buf
[IPA_CMD_BUF_SIZE
];
3927 if (!maybe_write_ipa_not_loaded (buf
))
3929 struct thread_info
*save_inferior
;
3930 struct inferior_list_entry
*inf
= all_threads
.head
;
3932 save_inferior
= current_inferior
;
3934 /* Find a certain thread which belongs to process PID. */
3937 if (ptid_get_pid (inf
->id
) == pid
)
3942 current_inferior
= (struct thread_info
*) inf
;
3944 strcpy (buf
, "close");
3946 run_inferior_command (buf
, strlen (buf
) + 1);
3948 current_inferior
= save_inferior
;
3952 /* Return the minimum instruction size needed for fast tracepoints as a
3953 hexadecimal number. */
3956 cmd_qtminftpilen (char *packet
)
3958 if (current_inferior
== NULL
)
3960 /* Indicate that the minimum length is currently unknown. */
3961 strcpy (packet
, "0");
3965 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
3968 /* Respond to qTBuffer packet with a block of raw data from the trace
3969 buffer. GDB may ask for a lot, but we are allowed to reply with
3970 only as much as will fit within packet limits or whatever. */
3973 cmd_qtbuffer (char *own_buf
)
3975 ULONGEST offset
, num
, tot
;
3977 char *packet
= own_buf
;
3979 packet
+= strlen ("qTBuffer:");
3981 packet
= unpack_varlen_hex (packet
, &offset
);
3982 ++packet
; /* skip a comma */
3983 unpack_varlen_hex (packet
, &num
);
3985 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
3986 (int) num
, pulongest (offset
));
3988 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
3990 /* If we're right at the end, reply specially that we're done. */
3993 strcpy (own_buf
, "l");
3997 /* Object to any other out-of-bounds request. */
4000 write_enn (own_buf
);
4004 /* Compute the pointer corresponding to the given offset, accounting
4006 tbp
= trace_buffer_start
+ offset
;
4007 if (tbp
>= trace_buffer_wrap
)
4008 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
4010 /* Trim to the remaining bytes if we're close to the end. */
4011 if (num
> tot
- offset
)
4014 /* Trim to available packet size. */
4015 if (num
>= (PBUFSIZ
- 16) / 2 )
4016 num
= (PBUFSIZ
- 16) / 2;
4018 convert_int_to_ascii (tbp
, own_buf
, num
);
4019 own_buf
[num
] = '\0';
4023 cmd_bigqtbuffer_circular (char *own_buf
)
4026 char *packet
= own_buf
;
4028 packet
+= strlen ("QTBuffer:circular:");
4030 unpack_varlen_hex (packet
, &val
);
4031 circular_trace_buffer
= val
;
4032 trace_debug ("Trace buffer is now %s",
4033 circular_trace_buffer
? "circular" : "linear");
4038 cmd_qtnotes (char *own_buf
)
4041 char *saved
, *user
, *notes
, *stopnote
;
4042 char *packet
= own_buf
;
4044 packet
+= strlen ("QTNotes:");
4048 if (strncmp ("user:", packet
, strlen ("user:")) == 0)
4050 packet
+= strlen ("user:");
4052 packet
= strchr (packet
, ';');
4053 nbytes
= (packet
- saved
) / 2;
4054 user
= xmalloc (nbytes
+ 1);
4055 nbytes
= unhexify (user
, saved
, nbytes
);
4056 user
[nbytes
] = '\0';
4057 ++packet
; /* skip the semicolon */
4058 trace_debug ("User is '%s'", user
);
4059 tracing_user_name
= user
;
4061 else if (strncmp ("notes:", packet
, strlen ("notes:")) == 0)
4063 packet
+= strlen ("notes:");
4065 packet
= strchr (packet
, ';');
4066 nbytes
= (packet
- saved
) / 2;
4067 notes
= xmalloc (nbytes
+ 1);
4068 nbytes
= unhexify (notes
, saved
, nbytes
);
4069 notes
[nbytes
] = '\0';
4070 ++packet
; /* skip the semicolon */
4071 trace_debug ("Notes is '%s'", notes
);
4072 tracing_notes
= notes
;
4074 else if (strncmp ("tstop:", packet
, strlen ("tstop:")) == 0)
4076 packet
+= strlen ("tstop:");
4078 packet
= strchr (packet
, ';');
4079 nbytes
= (packet
- saved
) / 2;
4080 stopnote
= xmalloc (nbytes
+ 1);
4081 nbytes
= unhexify (stopnote
, saved
, nbytes
);
4082 stopnote
[nbytes
] = '\0';
4083 ++packet
; /* skip the semicolon */
4084 trace_debug ("tstop note is '%s'", stopnote
);
4085 tracing_stop_note
= stopnote
;
4095 handle_tracepoint_general_set (char *packet
)
4097 if (strcmp ("QTinit", packet
) == 0)
4099 cmd_qtinit (packet
);
4102 else if (strncmp ("QTDP:", packet
, strlen ("QTDP:")) == 0)
4107 else if (strncmp ("QTDPsrc:", packet
, strlen ("QTDPsrc:")) == 0)
4109 cmd_qtdpsrc (packet
);
4112 else if (strncmp ("QTEnable:", packet
, strlen ("QTEnable:")) == 0)
4114 cmd_qtenable_disable (packet
, 1);
4117 else if (strncmp ("QTDisable:", packet
, strlen ("QTDisable:")) == 0)
4119 cmd_qtenable_disable (packet
, 0);
4122 else if (strncmp ("QTDV:", packet
, strlen ("QTDV:")) == 0)
4127 else if (strncmp ("QTro:", packet
, strlen ("QTro:")) == 0)
4132 else if (strcmp ("QTStart", packet
) == 0)
4134 cmd_qtstart (packet
);
4137 else if (strcmp ("QTStop", packet
) == 0)
4139 cmd_qtstop (packet
);
4142 else if (strncmp ("QTDisconnected:", packet
,
4143 strlen ("QTDisconnected:")) == 0)
4145 cmd_qtdisconnected (packet
);
4148 else if (strncmp ("QTFrame:", packet
, strlen ("QTFrame:")) == 0)
4150 cmd_qtframe (packet
);
4153 else if (strncmp ("QTBuffer:circular:", packet
, strlen ("QTBuffer:circular:")) == 0)
4155 cmd_bigqtbuffer_circular (packet
);
4158 else if (strncmp ("QTNotes:", packet
, strlen ("QTNotes:")) == 0)
4160 cmd_qtnotes (packet
);
4168 handle_tracepoint_query (char *packet
)
4170 if (strcmp ("qTStatus", packet
) == 0)
4172 cmd_qtstatus (packet
);
4175 else if (strncmp ("qTP:", packet
, strlen ("qTP:")) == 0)
4180 else if (strcmp ("qTfP", packet
) == 0)
4185 else if (strcmp ("qTsP", packet
) == 0)
4190 else if (strcmp ("qTfV", packet
) == 0)
4195 else if (strcmp ("qTsV", packet
) == 0)
4200 else if (strncmp ("qTV:", packet
, strlen ("qTV:")) == 0)
4205 else if (strncmp ("qTBuffer:", packet
, strlen ("qTBuffer:")) == 0)
4207 cmd_qtbuffer (packet
);
4210 else if (strcmp ("qTfSTM", packet
) == 0)
4212 cmd_qtfstm (packet
);
4215 else if (strcmp ("qTsSTM", packet
) == 0)
4217 cmd_qtsstm (packet
);
4220 else if (strncmp ("qTSTMat:", packet
, strlen ("qTSTMat:")) == 0)
4222 cmd_qtstmat (packet
);
4225 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4227 cmd_qtminftpilen (packet
);
4235 #ifndef IN_PROCESS_AGENT
4237 /* Call this when thread TINFO has hit the tracepoint defined by
4238 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4239 action. This adds a while-stepping collecting state item to the
4240 threads' collecting state list, so that we can keep track of
4241 multiple simultaneous while-stepping actions being collected by the
4242 same thread. This can happen in cases like:
4244 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4246 ff0003 INSN3 <-- TP2, collect $regs
4247 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4250 Notice that when instruction INSN5 is reached, the while-stepping
4251 actions of both TP1 and TP3 are still being collected, and that TP2
4252 had been collected meanwhile. The whole range of ff0001-ff0005
4253 should be single-stepped, due to at least TP1's while-stepping
4254 action covering the whole range. */
4257 add_while_stepping_state (struct thread_info
*tinfo
,
4258 int tp_number
, CORE_ADDR tp_address
)
4260 struct wstep_state
*wstep
;
4262 wstep
= xmalloc (sizeof (*wstep
));
4263 wstep
->next
= tinfo
->while_stepping
;
4265 wstep
->tp_number
= tp_number
;
4266 wstep
->tp_address
= tp_address
;
4267 wstep
->current_step
= 0;
4269 tinfo
->while_stepping
= wstep
;
4272 /* Release the while-stepping collecting state WSTEP. */
4275 release_while_stepping_state (struct wstep_state
*wstep
)
4280 /* Release all while-stepping collecting states currently associated
4281 with thread TINFO. */
4284 release_while_stepping_state_list (struct thread_info
*tinfo
)
4286 struct wstep_state
*head
;
4288 while (tinfo
->while_stepping
)
4290 head
= tinfo
->while_stepping
;
4291 tinfo
->while_stepping
= head
->next
;
4292 release_while_stepping_state (head
);
4296 /* If TINFO was handling a 'while-stepping' action, the step has
4297 finished, so collect any step data needed, and check if any more
4298 steps are required. Return true if the thread was indeed
4299 collecting tracepoint data, false otherwise. */
4302 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4304 struct tracepoint
*tpoint
;
4305 struct wstep_state
*wstep
;
4306 struct wstep_state
**wstep_link
;
4307 struct trap_tracepoint_ctx ctx
;
4309 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4311 if (agent_loaded_p ())
4312 upload_fast_traceframes ();
4314 /* Check if we were indeed collecting data for one of more
4315 tracepoints with a 'while-stepping' count. */
4316 if (tinfo
->while_stepping
== NULL
)
4321 /* We're not even tracing anymore. Stop this thread from
4323 release_while_stepping_state_list (tinfo
);
4325 /* The thread had stopped due to a single-step request indeed
4326 explained by a tracepoint. */
4330 wstep
= tinfo
->while_stepping
;
4331 wstep_link
= &tinfo
->while_stepping
;
4333 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4334 target_pid_to_str (tinfo
->entry
.id
),
4335 wstep
->tp_number
, paddress (wstep
->tp_address
));
4337 ctx
.base
.type
= trap_tracepoint
;
4338 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4340 while (wstep
!= NULL
)
4342 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4345 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4346 wstep
->tp_number
, paddress (wstep
->tp_address
),
4347 target_pid_to_str (tinfo
->entry
.id
));
4350 *wstep_link
= wstep
->next
;
4351 release_while_stepping_state (wstep
);
4352 wstep
= *wstep_link
;
4356 /* We've just finished one step. */
4357 ++wstep
->current_step
;
4360 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4361 stop_pc
, tpoint
, wstep
->current_step
);
4363 if (wstep
->current_step
>= tpoint
->step_count
)
4365 /* The requested numbers of steps have occurred. */
4366 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4367 target_pid_to_str (tinfo
->entry
.id
),
4368 wstep
->tp_number
, paddress (wstep
->tp_address
));
4370 /* Unlink the wstep. */
4371 *wstep_link
= wstep
->next
;
4372 release_while_stepping_state (wstep
);
4373 wstep
= *wstep_link
;
4375 /* Only check the hit count now, which ensure that we do all
4376 our stepping before stopping the run. */
4377 if (tpoint
->pass_count
> 0
4378 && tpoint
->hit_count
>= tpoint
->pass_count
4379 && stopping_tracepoint
== NULL
)
4380 stopping_tracepoint
= tpoint
;
4384 /* Keep single-stepping until the requested numbers of steps
4386 wstep_link
= &wstep
->next
;
4387 wstep
= *wstep_link
;
4390 if (stopping_tracepoint
4391 || trace_buffer_is_full
4392 || expr_eval_result
!= expr_eval_no_error
)
4402 /* Handle any internal tracing control breakpoint hits. That means,
4403 pull traceframes from the IPA to our buffer, and syncing both
4404 tracing agents when the IPA's tracing stops for some reason. */
4407 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4409 /* Pull in fast tracepoint trace frames from the inferior in-process
4410 agent's buffer into our buffer. */
4412 if (!agent_loaded_p ())
4415 upload_fast_traceframes ();
4417 /* Check if the in-process agent had decided we should stop
4419 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4421 int ipa_trace_buffer_is_full
;
4422 CORE_ADDR ipa_stopping_tracepoint
;
4423 int ipa_expr_eval_result
;
4424 CORE_ADDR ipa_error_tracepoint
;
4426 trace_debug ("lib stopped at stop_tracing");
4428 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4429 &ipa_trace_buffer_is_full
);
4431 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4432 &ipa_stopping_tracepoint
);
4433 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4435 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4436 &ipa_error_tracepoint
);
4437 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4439 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4440 &ipa_expr_eval_result
);
4441 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4443 trace_debug ("lib: trace_buffer_is_full: %d, "
4444 "stopping_tracepoint: %s, "
4445 "ipa_expr_eval_result: %d, "
4446 "error_tracepoint: %s, ",
4447 ipa_trace_buffer_is_full
,
4448 paddress (ipa_stopping_tracepoint
),
4449 ipa_expr_eval_result
,
4450 paddress (ipa_error_tracepoint
));
4454 if (ipa_trace_buffer_is_full
)
4455 trace_debug ("lib stopped due to full buffer.");
4456 if (ipa_stopping_tracepoint
)
4457 trace_debug ("lib stopped due to tpoint");
4458 if (ipa_stopping_tracepoint
)
4459 trace_debug ("lib stopped due to error");
4462 if (ipa_stopping_tracepoint
!= 0)
4465 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4467 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4469 expr_eval_result
= ipa_expr_eval_result
;
4471 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4476 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4478 trace_debug ("lib stopped at flush_trace_buffer");
4485 /* Return true if TINFO just hit a tracepoint. Collect data if
4489 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4491 struct tracepoint
*tpoint
;
4493 struct trap_tracepoint_ctx ctx
;
4495 /* Not tracing, don't handle. */
4499 ctx
.base
.type
= trap_tracepoint
;
4500 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4502 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4504 /* Note that we collect fast tracepoints here as well. We'll
4505 step over the fast tracepoint jump later, which avoids the
4506 double collect. However, we don't collect for static
4507 tracepoints here, because UST markers are compiled in program,
4508 and probes will be executed in program. So static tracepoints
4509 are collected there. */
4510 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4511 && tpoint
->type
!= static_tracepoint
)
4513 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4514 target_pid_to_str (tinfo
->entry
.id
),
4515 tpoint
->number
, paddress (tpoint
->address
));
4517 /* Test the condition if present, and collect if true. */
4519 || (condition_true_at_tracepoint
4520 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4521 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4524 if (stopping_tracepoint
4525 || trace_buffer_is_full
4526 || expr_eval_result
!= expr_eval_no_error
)
4530 /* If the tracepoint had a 'while-stepping' action, then set
4531 the thread to collect this tracepoint on the following
4533 else if (tpoint
->step_count
> 0)
4535 add_while_stepping_state (tinfo
,
4536 tpoint
->number
, tpoint
->address
);
4548 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4549 struct ust_marker_data
;
4550 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4551 struct traceframe
*tframe
);
4554 /* Create a trace frame for the hit of the given tracepoint in the
4558 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4559 struct tracepoint
*tpoint
)
4561 struct traceframe
*tframe
;
4564 /* Only count it as a hit when we actually collect data. */
4565 tpoint
->hit_count
++;
4567 /* If we've exceeded a defined pass count, record the event for
4568 later, and finish the collection for this hit. This test is only
4569 for nonstepping tracepoints, stepping tracepoints test at the end
4570 of their while-stepping loop. */
4571 if (tpoint
->pass_count
> 0
4572 && tpoint
->hit_count
>= tpoint
->pass_count
4573 && tpoint
->step_count
== 0
4574 && stopping_tracepoint
== NULL
)
4575 stopping_tracepoint
= tpoint
;
4577 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4578 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4580 tframe
= add_traceframe (tpoint
);
4584 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4586 #ifndef IN_PROCESS_AGENT
4587 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4588 tpoint
->number
, paddress (tpoint
->address
),
4589 tpoint
->actions_str
[acti
]);
4592 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4593 tpoint
->actions
[acti
]);
4596 finish_traceframe (tframe
);
4599 if (tframe
== NULL
&& tracing
)
4600 trace_buffer_is_full
= 1;
4603 #ifndef IN_PROCESS_AGENT
4606 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4608 struct tracepoint
*tpoint
, int current_step
)
4610 struct traceframe
*tframe
;
4613 trace_debug ("Making new step traceframe for "
4614 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4615 tpoint
->number
, paddress (tpoint
->address
),
4616 current_step
, tpoint
->step_count
,
4619 tframe
= add_traceframe (tpoint
);
4623 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4625 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4626 tpoint
->number
, paddress (tpoint
->address
),
4627 tpoint
->step_actions_str
[acti
]);
4629 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4630 tpoint
->step_actions
[acti
]);
4633 finish_traceframe (tframe
);
4636 if (tframe
== NULL
&& tracing
)
4637 trace_buffer_is_full
= 1;
4642 static struct regcache
*
4643 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4645 struct regcache
*regcache
= NULL
;
4647 #ifdef IN_PROCESS_AGENT
4648 if (ctx
->type
== fast_tracepoint
)
4650 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4651 if (!fctx
->regcache_initted
)
4653 fctx
->regcache_initted
= 1;
4654 init_register_cache (&fctx
->regcache
, fctx
->regspace
);
4655 supply_regblock (&fctx
->regcache
, NULL
);
4656 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4658 regcache
= &fctx
->regcache
;
4661 if (ctx
->type
== static_tracepoint
)
4663 struct static_tracepoint_ctx
*sctx
4664 = (struct static_tracepoint_ctx
*) ctx
;
4666 if (!sctx
->regcache_initted
)
4668 sctx
->regcache_initted
= 1;
4669 init_register_cache (&sctx
->regcache
, sctx
->regspace
);
4670 supply_regblock (&sctx
->regcache
, NULL
);
4671 /* Pass down the tracepoint address, because REGS doesn't
4672 include the PC, but we know what it must have been. */
4673 supply_static_tracepoint_registers (&sctx
->regcache
,
4674 (const unsigned char *)
4676 sctx
->tpoint
->address
);
4678 regcache
= &sctx
->regcache
;
4682 if (ctx
->type
== trap_tracepoint
)
4684 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4685 regcache
= tctx
->regcache
;
4689 gdb_assert (regcache
!= NULL
);
4695 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4697 struct tracepoint
*tpoint
,
4698 struct traceframe
*tframe
,
4699 struct tracepoint_action
*taction
)
4701 enum eval_result_type err
;
4703 switch (taction
->type
)
4707 struct collect_memory_action
*maction
;
4709 maction
= (struct collect_memory_action
*) taction
;
4711 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4712 pulongest (maction
->len
),
4713 paddress (maction
->addr
), maction
->basereg
);
4714 /* (should use basereg) */
4715 agent_mem_read (tframe
, NULL
,
4716 (CORE_ADDR
) maction
->addr
, maction
->len
);
4721 unsigned char *regspace
;
4722 struct regcache tregcache
;
4723 struct regcache
*context_regcache
;
4726 trace_debug ("Want to collect registers");
4728 /* Collect all registers for now. */
4729 regspace
= add_traceframe_block (tframe
,
4730 1 + register_cache_size ());
4731 if (regspace
== NULL
)
4733 trace_debug ("Trace buffer block allocation failed, skipping");
4736 /* Identify a register block. */
4739 context_regcache
= get_context_regcache (ctx
);
4741 /* Wrap the regblock in a register cache (in the stack, we
4742 don't want to malloc here). */
4743 init_register_cache (&tregcache
, regspace
+ 1);
4745 /* Copy the register data to the regblock. */
4746 regcache_cpy (&tregcache
, context_regcache
);
4748 #ifndef IN_PROCESS_AGENT
4749 /* On some platforms, trap-based tracepoints will have the PC
4750 pointing to the next instruction after the trap, but we
4751 don't want the user or GDB trying to guess whether the
4752 saved PC needs adjusting; so always record the adjusted
4753 stop_pc. Note that we can't use tpoint->address instead,
4754 since it will be wrong for while-stepping actions. This
4755 adjustment is a nop for fast tracepoints collected from the
4756 in-process lib (but not if GDBserver is collecting one
4757 preemptively), since the PC had already been adjusted to
4758 contain the tracepoint's address by the jump pad. */
4759 trace_debug ("Storing stop pc (0x%s) in regblock",
4760 paddress (stop_pc
));
4762 /* This changes the regblock, not the thread's
4764 regcache_write_pc (&tregcache
, stop_pc
);
4770 struct eval_expr_action
*eaction
;
4772 eaction
= (struct eval_expr_action
*) taction
;
4774 trace_debug ("Want to evaluate expression");
4776 err
= eval_tracepoint_agent_expr (ctx
, tframe
, eaction
->expr
, NULL
);
4778 if (err
!= expr_eval_no_error
)
4780 record_tracepoint_error (tpoint
, "action expression", err
);
4787 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4788 trace_debug ("Want to collect static trace data");
4789 collect_ust_data_at_tracepoint (ctx
, tframe
);
4791 trace_debug ("warning: collecting static trace data, "
4792 "but static tracepoints are not supported");
4797 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4803 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4804 struct tracepoint
*tpoint
)
4807 enum eval_result_type err
;
4809 /* Presently, gdbserver doesn't run compiled conditions, only the
4810 IPA does. If the program stops at a fast tracepoint's address
4811 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4812 gdbserver preemptively collect the fast tracepoint. Later, on
4813 resume, gdbserver steps over the fast tracepoint like it steps
4814 over breakpoints, so that the IPA doesn't see that fast
4815 tracepoint. This avoids double collects of fast tracepoints in
4816 that stopping scenario. Having gdbserver itself handle the fast
4817 tracepoint gives the user a consistent view of when fast or trap
4818 tracepoints are collected, compared to an alternative where only
4819 trap tracepoints are collected on stop, and fast tracepoints on
4820 resume. When a fast tracepoint is being processed by gdbserver,
4821 it is always the non-compiled condition expression that is
4823 #ifdef IN_PROCESS_AGENT
4824 if (tpoint
->compiled_cond
)
4825 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (ctx
, &value
);
4828 err
= eval_tracepoint_agent_expr (ctx
, NULL
, tpoint
->cond
, &value
);
4830 if (err
!= expr_eval_no_error
)
4832 record_tracepoint_error (tpoint
, "condition", err
);
4833 /* The error case must return false. */
4837 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4838 tpoint
->number
, paddress (tpoint
->address
),
4840 return (value
? 1 : 0);
4843 /* Evaluates a tracepoint agent expression with context CTX,
4844 traceframe TFRAME, agent expression AEXPR and store the
4847 static enum eval_result_type
4848 eval_tracepoint_agent_expr (struct tracepoint_hit_ctx
*ctx
,
4849 struct traceframe
*tframe
,
4850 struct agent_expr
*aexpr
,
4853 struct regcache
*regcache
;
4854 regcache
= get_context_regcache (ctx
);
4856 return gdb_eval_agent_expr (regcache
, tframe
, aexpr
, rslt
);
4859 /* Do memory copies for bytecodes. */
4860 /* Do the recording of memory blocks for actions and bytecodes. */
4863 agent_mem_read (struct traceframe
*tframe
,
4864 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4866 unsigned char *mspace
;
4867 ULONGEST remaining
= len
;
4868 unsigned short blocklen
;
4870 /* If a 'to' buffer is specified, use it. */
4873 read_inferior_memory (from
, to
, len
);
4877 /* Otherwise, create a new memory block in the trace buffer. */
4878 while (remaining
> 0)
4882 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4883 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4884 mspace
= add_traceframe_block (tframe
, sp
);
4887 /* Identify block as a memory block. */
4890 /* Record address and size. */
4891 memcpy (mspace
, &from
, sizeof (from
));
4892 mspace
+= sizeof (from
);
4893 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4894 mspace
+= sizeof (blocklen
);
4895 /* Record the memory block proper. */
4896 read_inferior_memory (from
, mspace
, blocklen
);
4897 trace_debug ("%d bytes recorded", blocklen
);
4898 remaining
-= blocklen
;
4905 agent_mem_read_string (struct traceframe
*tframe
,
4906 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4908 unsigned char *buf
, *mspace
;
4909 ULONGEST remaining
= len
;
4910 unsigned short blocklen
, i
;
4912 /* To save a bit of space, block lengths are 16-bit, so break large
4913 requests into multiple blocks. Bordering on overkill for strings,
4914 but it could happen that someone specifies a large max length. */
4915 while (remaining
> 0)
4919 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4920 /* We want working space to accumulate nonzero bytes, since
4921 traceframes must have a predecided size (otherwise it gets
4922 harder to wrap correctly for the circular case, etc). */
4923 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
4924 for (i
= 0; i
< blocklen
; ++i
)
4926 /* Read the string one byte at a time, in case the string is
4927 at the end of a valid memory area - we don't want a
4928 correctly-terminated string to engender segvio
4930 read_inferior_memory (from
+ i
, buf
+ i
, 1);
4935 /* Make sure outer loop stops now too. */
4936 remaining
= blocklen
;
4940 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4941 mspace
= add_traceframe_block (tframe
, sp
);
4947 /* Identify block as a memory block. */
4950 /* Record address and size. */
4951 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
4952 mspace
+= sizeof (from
);
4953 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
4954 mspace
+= sizeof (blocklen
);
4955 /* Copy the string contents. */
4956 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
4957 remaining
-= blocklen
;
4964 /* Record the value of a trace state variable. */
4967 agent_tsv_read (struct traceframe
*tframe
, int n
)
4969 unsigned char *vspace
;
4972 vspace
= add_traceframe_block (tframe
,
4973 1 + sizeof (n
) + sizeof (LONGEST
));
4976 /* Identify block as a variable. */
4978 /* Record variable's number and value. */
4979 memcpy (vspace
+ 1, &n
, sizeof (n
));
4980 val
= get_trace_state_variable_value (n
);
4981 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
4982 trace_debug ("Variable %d recorded", n
);
4986 #ifndef IN_PROCESS_AGENT
4988 /* Callback for traceframe_walk_blocks, used to find a given block
4989 type in a traceframe. */
4992 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
4994 char *wantedp
= data
;
4996 if (*wantedp
== blocktype
)
5002 /* Walk over all traceframe blocks of the traceframe buffer starting
5003 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5004 block found, passing in DATA unmodified. If CALLBACK returns true,
5005 this returns a pointer to where the block is found. Returns NULL
5006 if no callback call returned true, indicating that all blocks have
5009 static unsigned char *
5010 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
5012 int (*callback
) (char blocktype
,
5013 unsigned char *dataptr
,
5017 unsigned char *dataptr
;
5021 trace_debug ("traceframe %d has no data", tfnum
);
5025 /* Iterate through a traceframe's blocks, looking for a block of the
5027 for (dataptr
= database
;
5028 dataptr
< database
+ datasize
;
5032 unsigned short mlen
;
5034 if (dataptr
== trace_buffer_wrap
)
5036 /* Adjust to reflect wrapping part of the frame around to
5038 datasize
= dataptr
- database
;
5039 dataptr
= database
= trace_buffer_lo
;
5042 blocktype
= *dataptr
++;
5044 if ((*callback
) (blocktype
, dataptr
, data
))
5050 /* Skip over the registers block. */
5051 dataptr
+= register_cache_size ();
5054 /* Skip over the memory block. */
5055 dataptr
+= sizeof (CORE_ADDR
);
5056 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5057 dataptr
+= (sizeof (mlen
) + mlen
);
5060 /* Skip over the TSV block. */
5061 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5064 /* Skip over the static trace data block. */
5065 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5066 dataptr
+= (sizeof (mlen
) + mlen
);
5069 trace_debug ("traceframe %d has unknown block type 0x%x",
5078 /* Look for the block of type TYPE_WANTED in the trameframe starting
5079 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5082 static unsigned char *
5083 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5084 int tfnum
, char type_wanted
)
5086 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5087 match_blocktype
, &type_wanted
);
5090 static unsigned char *
5091 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5093 unsigned char *regblock
;
5095 regblock
= traceframe_find_block_type (tframe
->data
,
5099 if (regblock
== NULL
)
5100 trace_debug ("traceframe %d has no register data", tfnum
);
5105 /* Get registers from a traceframe. */
5108 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5110 unsigned char *dataptr
;
5111 struct tracepoint
*tpoint
;
5112 struct traceframe
*tframe
;
5114 tframe
= find_traceframe (tfnum
);
5118 trace_debug ("traceframe %d not found", tfnum
);
5122 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5123 if (dataptr
== NULL
)
5125 /* Mark registers unavailable. */
5126 supply_regblock (regcache
, NULL
);
5128 /* We can generally guess at a PC, although this will be
5129 misleading for while-stepping frames and multi-location
5131 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5133 regcache_write_pc (regcache
, tpoint
->address
);
5136 supply_regblock (regcache
, dataptr
);
5142 traceframe_get_pc (struct traceframe
*tframe
)
5144 struct regcache regcache
;
5145 unsigned char *dataptr
;
5147 dataptr
= traceframe_find_regblock (tframe
, -1);
5148 if (dataptr
== NULL
)
5151 init_register_cache (®cache
, dataptr
);
5152 return regcache_read_pc (®cache
);
5155 /* Read a requested block of memory from a trace frame. */
5158 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5159 unsigned char *buf
, ULONGEST length
,
5162 struct traceframe
*tframe
;
5163 unsigned char *database
, *dataptr
;
5164 unsigned int datasize
;
5166 unsigned short mlen
;
5168 trace_debug ("traceframe_read_mem");
5170 tframe
= find_traceframe (tfnum
);
5174 trace_debug ("traceframe %d not found", tfnum
);
5178 datasize
= tframe
->data_size
;
5179 database
= dataptr
= &tframe
->data
[0];
5181 /* Iterate through a traceframe's blocks, looking for memory. */
5182 while ((dataptr
= traceframe_find_block_type (dataptr
,
5184 - (dataptr
- database
),
5185 tfnum
, 'M')) != NULL
)
5187 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5188 dataptr
+= sizeof (maddr
);
5189 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5190 dataptr
+= sizeof (mlen
);
5191 trace_debug ("traceframe %d has %d bytes at %s",
5192 tfnum
, mlen
, paddress (maddr
));
5194 /* If the block includes the first part of the desired range,
5195 return as much it has; GDB will re-request the remainder,
5196 which might be in a different block of this trace frame. */
5197 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5199 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5203 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5208 /* Skip over this block. */
5212 trace_debug ("traceframe %d has no memory data for the desired region",
5220 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5223 struct traceframe
*tframe
;
5224 unsigned char *database
, *dataptr
;
5225 unsigned int datasize
;
5228 trace_debug ("traceframe_read_tsv");
5230 tfnum
= current_traceframe
;
5234 trace_debug ("no current traceframe");
5238 tframe
= find_traceframe (tfnum
);
5242 trace_debug ("traceframe %d not found", tfnum
);
5246 datasize
= tframe
->data_size
;
5247 database
= dataptr
= &tframe
->data
[0];
5249 /* Iterate through a traceframe's blocks, looking for the tsv. */
5250 while ((dataptr
= traceframe_find_block_type (dataptr
,
5252 - (dataptr
- database
),
5253 tfnum
, 'V')) != NULL
)
5255 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5256 dataptr
+= sizeof (vnum
);
5258 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5260 /* Check that this is the variable we want. */
5263 memcpy (val
, dataptr
, sizeof (*val
));
5267 /* Skip over this block. */
5268 dataptr
+= sizeof (LONGEST
);
5271 trace_debug ("traceframe %d has no data for variable %d",
5276 /* Read a requested block of static tracepoint data from a trace
5280 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5281 unsigned char *buf
, ULONGEST length
,
5284 struct traceframe
*tframe
;
5285 unsigned char *database
, *dataptr
;
5286 unsigned int datasize
;
5287 unsigned short mlen
;
5289 trace_debug ("traceframe_read_sdata");
5291 tframe
= find_traceframe (tfnum
);
5295 trace_debug ("traceframe %d not found", tfnum
);
5299 datasize
= tframe
->data_size
;
5300 database
= &tframe
->data
[0];
5302 /* Iterate through a traceframe's blocks, looking for static
5304 dataptr
= traceframe_find_block_type (database
, datasize
,
5306 if (dataptr
!= NULL
)
5308 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5309 dataptr
+= sizeof (mlen
);
5312 if (offset
+ length
> mlen
)
5313 length
= mlen
- offset
;
5315 memcpy (buf
, dataptr
, length
);
5323 trace_debug ("traceframe %d has no static trace data", tfnum
);
5329 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5330 object. DATA is pointer to a struct buffer holding the
5331 traceframe-info object being built. */
5334 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5336 struct buffer
*buffer
= data
;
5342 unsigned short mlen
;
5345 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5346 dataptr
+= sizeof (maddr
);
5347 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5348 dataptr
+= sizeof (mlen
);
5349 buffer_xml_printf (buffer
,
5350 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5351 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5361 warning ("Unhandled trace block type (%d) '%c ' "
5362 "while building trace frame info.",
5363 blocktype
, blocktype
);
5370 /* Build a traceframe-info object for traceframe number TFNUM into
5374 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5376 struct traceframe
*tframe
;
5378 trace_debug ("traceframe_read_info");
5380 tframe
= find_traceframe (tfnum
);
5384 trace_debug ("traceframe %d not found", tfnum
);
5388 buffer_grow_str (buffer
, "<traceframe-info>\n");
5389 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5390 tfnum
, build_traceframe_info_xml
, buffer
);
5391 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5395 /* Return the first fast tracepoint whose jump pad contains PC. */
5397 static struct tracepoint
*
5398 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5400 struct tracepoint
*tpoint
;
5402 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5403 if (tpoint
->type
== fast_tracepoint
)
5404 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5410 /* Return the first fast tracepoint whose trampoline contains PC. */
5412 static struct tracepoint
*
5413 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5415 struct tracepoint
*tpoint
;
5417 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5419 if (tpoint
->type
== fast_tracepoint
5420 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5427 /* Return GDBserver's tracepoint that matches the IP Agent's
5428 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5431 static struct tracepoint
*
5432 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5434 struct tracepoint
*tpoint
;
5436 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5437 if (tpoint
->type
== fast_tracepoint
)
5438 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5446 /* The type of the object that is used to synchronize fast tracepoint
5449 typedef struct collecting_t
5451 /* The fast tracepoint number currently collecting. */
5454 /* A number that GDBserver can use to identify the thread that is
5455 presently holding the collect lock. This need not (and usually
5456 is not) the thread id, as getting the current thread ID usually
5457 requires a system call, which we want to avoid like the plague.
5458 Usually this is thread's TCB, found in the TLS (pseudo-)
5459 register, which is readable with a single insn on several
5461 uintptr_t thread_area
;
5464 #ifndef IN_PROCESS_AGENT
5467 force_unlock_trace_buffer (void)
5469 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5472 /* Check if the thread identified by THREAD_AREA which is stopped at
5473 STOP_PC, is presently locking the fast tracepoint collection, and
5474 if so, gather some status of said collection. Returns 0 if the
5475 thread isn't collecting or in the jump pad at all. 1, if in the
5476 jump pad (or within gdb_collect) and hasn't executed the adjusted
5477 original insn yet (can set a breakpoint there and run to it). 2,
5478 if presently executing the adjusted original insn --- in which
5479 case, if we want to move the thread out of the jump pad, we need to
5480 single-step it until this function returns 0. */
5483 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5485 struct fast_tpoint_collect_status
*status
)
5487 CORE_ADDR ipa_collecting
;
5488 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5489 CORE_ADDR ipa_gdb_trampoline_buffer
;
5490 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5491 struct tracepoint
*tpoint
;
5492 int needs_breakpoint
;
5494 /* The thread THREAD_AREA is either:
5496 0. not collecting at all, not within the jump pad, or within
5497 gdb_collect or one of its callees.
5499 1. in the jump pad and haven't reached gdb_collect
5501 2. within gdb_collect (out of the jump pad) (collect is set)
5503 3. we're in the jump pad, after gdb_collect having returned,
5504 possibly executing the adjusted insns.
5506 For cases 1 and 3, `collecting' may or not be set. The jump pad
5507 doesn't have any complicated jump logic, so we can tell if the
5508 thread is executing the adjust original insn or not by just
5509 matching STOP_PC with known jump pad addresses. If we it isn't
5510 yet executing the original insn, set a breakpoint there, and let
5511 the thread run to it, so to quickly step over a possible (many
5512 insns) gdb_collect call. Otherwise, or when the breakpoint is
5513 hit, only a few (small number of) insns are left to be executed
5514 in the jump pad. Single-step the thread until it leaves the
5519 needs_breakpoint
= 0;
5520 trace_debug ("fast_tracepoint_collecting");
5522 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5523 &ipa_gdb_jump_pad_buffer
))
5524 fatal ("error extracting `gdb_jump_pad_buffer'");
5525 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5526 &ipa_gdb_jump_pad_buffer_end
))
5527 fatal ("error extracting `gdb_jump_pad_buffer_end'");
5529 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5530 &ipa_gdb_trampoline_buffer
))
5531 fatal ("error extracting `gdb_trampoline_buffer'");
5532 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5533 &ipa_gdb_trampoline_buffer_end
))
5534 fatal ("error extracting `gdb_trampoline_buffer_end'");
5536 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5537 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5539 /* We can tell which tracepoint(s) the thread is collecting by
5540 matching the jump pad address back to the tracepoint. */
5541 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5544 warning ("in jump pad, but no matching tpoint?");
5549 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5551 tpoint
->number
, paddress (tpoint
->address
),
5552 paddress (tpoint
->jump_pad
),
5553 paddress (tpoint
->jump_pad_end
),
5554 paddress (tpoint
->adjusted_insn_addr
),
5555 paddress (tpoint
->adjusted_insn_addr_end
));
5558 /* Definitely in the jump pad. May or may not need
5559 fast-exit-jump-pad breakpoint. */
5560 if (tpoint
->jump_pad
<= stop_pc
5561 && stop_pc
< tpoint
->adjusted_insn_addr
)
5562 needs_breakpoint
= 1;
5564 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5565 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5567 /* We can tell which tracepoint(s) the thread is collecting by
5568 matching the trampoline address back to the tracepoint. */
5569 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5572 warning ("in trampoline, but no matching tpoint?");
5577 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5578 tpoint
->number
, paddress (tpoint
->address
),
5579 paddress (tpoint
->trampoline
),
5580 paddress (tpoint
->trampoline_end
));
5583 /* Have not reached jump pad yet, but treat the trampoline as a
5584 part of the jump pad that is before the adjusted original
5586 needs_breakpoint
= 1;
5590 collecting_t ipa_collecting_obj
;
5592 /* If `collecting' is set/locked, then the THREAD_AREA thread
5593 may or not be the one holding the lock. We have to read the
5594 lock to find out. */
5596 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5599 trace_debug ("fast_tracepoint_collecting:"
5600 " failed reading 'collecting' in the inferior");
5604 if (!ipa_collecting
)
5606 trace_debug ("fast_tracepoint_collecting: not collecting"
5607 " (and nobody is).");
5611 /* Some thread is collecting. Check which. */
5612 if (read_inferior_memory (ipa_collecting
,
5613 (unsigned char *) &ipa_collecting_obj
,
5614 sizeof (ipa_collecting_obj
)) != 0)
5617 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5619 trace_debug ("fast_tracepoint_collecting: not collecting "
5620 "(another thread is)");
5625 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5628 warning ("fast_tracepoint_collecting: collecting, "
5629 "but tpoint %s not found?",
5630 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5634 /* The thread is within `gdb_collect', skip over the rest of
5635 fast tracepoint collection quickly using a breakpoint. */
5636 needs_breakpoint
= 1;
5639 /* The caller wants a bit of status detail. */
5642 status
->tpoint_num
= tpoint
->number
;
5643 status
->tpoint_addr
= tpoint
->address
;
5644 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5645 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5648 if (needs_breakpoint
)
5650 /* Hasn't executed the original instruction yet. Set breakpoint
5651 there, and wait till it's hit, then single-step until exiting
5655 fast_tracepoint_collecting, returning continue-until-break at %s",
5656 paddress (tpoint
->adjusted_insn_addr
));
5658 return 1; /* continue */
5662 /* Just single-step until exiting the jump pad. */
5664 trace_debug ("fast_tracepoint_collecting, returning "
5665 "need-single-step (%s-%s)",
5666 paddress (tpoint
->adjusted_insn_addr
),
5667 paddress (tpoint
->adjusted_insn_addr_end
));
5669 return 2; /* single-step */
5675 #ifdef IN_PROCESS_AGENT
5677 /* The global fast tracepoint collect lock. Points to a collecting_t
5678 object built on the stack by the jump pad, if presently locked;
5679 NULL if it isn't locked. Note that this lock *must* be set while
5680 executing any *function other than the jump pad. See
5681 fast_tracepoint_collecting. */
5682 static collecting_t
* ATTR_USED collecting
;
5684 /* This routine, called from the jump pad (in asm) is designed to be
5685 called from the jump pads of fast tracepoints, thus it is on the
5688 IP_AGENT_EXPORT
void ATTR_USED
5689 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5691 struct fast_tracepoint_ctx ctx
;
5693 /* Don't do anything until the trace run is completely set up. */
5697 ctx
.base
.type
= fast_tracepoint
;
5699 ctx
.regcache_initted
= 0;
5700 /* Wrap the regblock in a register cache (in the stack, we don't
5701 want to malloc here). */
5702 ctx
.regspace
= alloca (register_cache_size ());
5703 if (ctx
.regspace
== NULL
)
5705 trace_debug ("Trace buffer block allocation failed, skipping");
5709 for (ctx
.tpoint
= tpoint
;
5710 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5711 ctx
.tpoint
= ctx
.tpoint
->next
)
5713 if (!ctx
.tpoint
->enabled
)
5716 /* Multiple tracepoints of different types, such as fast tracepoint and
5717 static tracepoint, can be set at the same address. */
5718 if (ctx
.tpoint
->type
!= tpoint
->type
)
5721 /* Test the condition if present, and collect if true. */
5722 if (ctx
.tpoint
->cond
== NULL
5723 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5726 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5727 ctx
.tpoint
->address
, ctx
.tpoint
);
5729 /* Note that this will cause original insns to be written back
5730 to where we jumped from, but that's OK because we're jumping
5731 back to the next whole instruction. This will go badly if
5732 instruction restoration is not atomic though. */
5733 if (stopping_tracepoint
5734 || trace_buffer_is_full
5735 || expr_eval_result
!= expr_eval_no_error
)
5743 /* If there was a condition and it evaluated to false, the only
5744 way we would stop tracing is if there was an error during
5745 condition expression evaluation. */
5746 if (expr_eval_result
!= expr_eval_no_error
)
5757 #ifndef IN_PROCESS_AGENT
5760 get_raw_reg_func_addr (void)
5762 return ipa_sym_addrs
.addr_get_raw_reg
;
5766 get_get_tsv_func_addr (void)
5768 return ipa_sym_addrs
.addr_get_trace_state_variable_value
;
5772 get_set_tsv_func_addr (void)
5774 return ipa_sym_addrs
.addr_set_trace_state_variable_value
;
5778 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5779 CORE_ADDR
*jump_entry
)
5781 CORE_ADDR entry_point
= *jump_entry
;
5782 enum eval_result_type err
;
5784 trace_debug ("Starting condition compilation for tracepoint %d\n",
5787 /* Initialize the global pointer to the code being built. */
5788 current_insn_ptr
= *jump_entry
;
5792 err
= compile_bytecodes (tpoint
->cond
);
5794 if (err
== expr_eval_no_error
)
5798 /* Record the beginning of the compiled code. */
5799 tpoint
->compiled_cond
= entry_point
;
5801 trace_debug ("Condition compilation for tracepoint %d complete\n",
5806 /* Leave the unfinished code in situ, but don't point to it. */
5808 tpoint
->compiled_cond
= 0;
5810 trace_debug ("Condition compilation for tracepoint %d failed, "
5812 tpoint
->number
, err
);
5815 /* Update the code pointer passed in. Note that we do this even if
5816 the compile fails, so that we can look at the partial results
5817 instead of letting them be overwritten. */
5818 *jump_entry
= current_insn_ptr
;
5820 /* Leave a gap, to aid dump decipherment. */
5824 /* We'll need to adjust these when we consider bi-arch setups, and big
5828 write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
)
5830 return write_inferior_memory (where
,
5831 (unsigned char *) &ptr
, sizeof (void *));
5834 /* The base pointer of the IPA's heap. This is the only memory the
5835 IPA is allowed to use. The IPA should _not_ call the inferior's
5836 `malloc' during operation. That'd be slow, and, most importantly,
5837 it may not be safe. We may be collecting a tracepoint in a signal
5838 handler, for example. */
5839 static CORE_ADDR target_tp_heap
;
5841 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5845 target_malloc (ULONGEST size
)
5849 if (target_tp_heap
== 0)
5851 /* We have the pointer *address*, need what it points to. */
5852 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5854 fatal ("could get target heap head pointer");
5857 ptr
= target_tp_heap
;
5858 target_tp_heap
+= size
;
5860 /* Pad to 8-byte alignment. */
5861 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
5867 download_agent_expr (struct agent_expr
*expr
)
5869 CORE_ADDR expr_addr
;
5870 CORE_ADDR expr_bytes
;
5872 expr_addr
= target_malloc (sizeof (*expr
));
5873 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
5875 expr_bytes
= target_malloc (expr
->length
);
5876 write_inferior_data_ptr (expr_addr
+ offsetof (struct agent_expr
, bytes
),
5878 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
5883 /* Align V up to N bits. */
5884 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5886 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5889 download_tracepoint_1 (struct tracepoint
*tpoint
)
5891 struct tracepoint target_tracepoint
;
5892 CORE_ADDR tpptr
= 0;
5894 gdb_assert (tpoint
->type
== fast_tracepoint
5895 || tpoint
->type
== static_tracepoint
);
5897 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
5899 CORE_ADDR jentry
, jump_entry
;
5901 jentry
= jump_entry
= get_jump_space_head ();
5903 if (tpoint
->cond
!= NULL
)
5905 /* Pad to 8-byte alignment. (needed?) */
5906 /* Actually this should be left for the target to
5908 jentry
= UALIGN (jentry
, 8);
5910 compile_tracepoint_condition (tpoint
, &jentry
);
5913 /* Pad to 8-byte alignment. */
5914 jentry
= UALIGN (jentry
, 8);
5915 claim_jump_space (jentry
- jump_entry
);
5918 target_tracepoint
= *tpoint
;
5920 tpptr
= target_malloc (sizeof (*tpoint
));
5921 tpoint
->obj_addr_on_target
= tpptr
;
5923 /* Write the whole object. We'll fix up its pointers in a bit.
5924 Assume no next for now. This is fixed up above on the next
5925 iteration, if there's any. */
5926 target_tracepoint
.next
= NULL
;
5927 /* Need to clear this here too, since we're downloading the
5928 tracepoints before clearing our own copy. */
5929 target_tracepoint
.hit_count
= 0;
5931 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
5932 sizeof (target_tracepoint
));
5935 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5937 download_agent_expr (tpoint
->cond
));
5939 if (tpoint
->numactions
)
5942 CORE_ADDR actions_array
;
5944 /* The pointers array. */
5946 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
5947 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
5951 /* Now for each pointer, download the action. */
5952 for (i
= 0; i
< tpoint
->numactions
; i
++)
5954 struct tracepoint_action
*action
= tpoint
->actions
[i
];
5955 CORE_ADDR ipa_action
= action
->ops
->download (action
);
5957 if (ipa_action
!= 0)
5958 write_inferior_data_ptr
5959 (actions_array
+ i
* sizeof (sizeof (*tpoint
->actions
)),
5965 #define IPA_PROTO_FAST_TRACE_FLAG 0
5966 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
5967 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
5968 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
5969 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
5971 /* Send a command to agent to download and install tracepoint TPOINT. */
5974 tracepoint_send_agent (struct tracepoint
*tpoint
)
5976 char buf
[IPA_CMD_BUF_SIZE
];
5981 strcpy (p
, "FastTrace:");
5984 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
5985 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
5986 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
5987 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
5988 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
5989 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
5990 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
5991 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
5992 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
5993 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
5994 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
5997 p
= agent_expr_send (p
, tpoint
->cond
);
5999 /* tracepoint_action */
6000 for (i
= 0; i
< tpoint
->numactions
; i
++)
6002 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6004 p
[0] = action
->type
;
6005 p
= action
->ops
->send (&p
[1], action
);
6008 get_jump_space_head ();
6009 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6010 agent can use jump pad from it. */
6011 if (tpoint
->type
== fast_tracepoint
)
6013 memcpy (p
, &gdb_jump_pad_head
, 8);
6017 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
6021 if (strncmp (buf
, "OK", 2) != 0)
6024 /* The value of tracepoint's target address is stored in BUF. */
6025 memcpy (&tpoint
->obj_addr_on_target
,
6026 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6028 if (tpoint
->type
== fast_tracepoint
)
6031 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6034 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6035 (unsigned int) tpoint
->obj_addr_on_target
,
6036 (unsigned int) gdb_jump_pad_head
);
6038 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6040 /* This has been done in agent. We should also set up record for it. */
6041 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6044 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6051 download_tracepoint (struct tracepoint
*tpoint
)
6053 struct tracepoint
*tp
, *tp_prev
;
6055 if (tpoint
->type
!= fast_tracepoint
6056 && tpoint
->type
!= static_tracepoint
)
6059 download_tracepoint_1 (tpoint
);
6061 /* Find the previous entry of TPOINT, which is fast tracepoint or
6062 static tracepoint. */
6064 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6066 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6072 CORE_ADDR tp_prev_target_next_addr
;
6074 /* Insert TPOINT after TP_PREV in IPA. */
6075 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6076 + offsetof (struct tracepoint
, next
),
6077 &tp_prev_target_next_addr
))
6078 fatal ("error reading `tp_prev->next'");
6080 /* tpoint->next = tp_prev->next */
6081 write_inferior_data_ptr (tpoint
->obj_addr_on_target
6082 + offsetof (struct tracepoint
, next
),
6083 tp_prev_target_next_addr
);
6084 /* tp_prev->next = tpoint */
6085 write_inferior_data_ptr (tp_prev
->obj_addr_on_target
6086 + offsetof (struct tracepoint
, next
),
6087 tpoint
->obj_addr_on_target
);
6090 /* First object in list, set the head pointer in the
6092 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
,
6093 tpoint
->obj_addr_on_target
);
6098 download_trace_state_variables (void)
6100 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6101 struct trace_state_variable
*tsv
;
6103 /* Start out empty. */
6104 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6106 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6108 struct trace_state_variable target_tsv
;
6110 /* TSV's with a getter have been initialized equally in both the
6111 inferior and GDBserver. Skip them. */
6112 if (tsv
->getter
!= NULL
)
6118 ptr
= target_malloc (sizeof (*tsv
));
6120 if (tsv
== trace_state_variables
)
6122 /* First object in list, set the head pointer in the
6125 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
,
6130 write_inferior_data_ptr (prev_ptr
6131 + offsetof (struct trace_state_variable
,
6136 /* Write the whole object. We'll fix up its pointers in a bit.
6137 Assume no next, fixup when needed. */
6138 target_tsv
.next
= NULL
;
6140 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6141 sizeof (target_tsv
));
6143 if (tsv
->name
!= NULL
)
6145 size_t size
= strlen (tsv
->name
) + 1;
6146 CORE_ADDR name_addr
= target_malloc (size
);
6147 write_inferior_memory (name_addr
,
6148 (unsigned char *) tsv
->name
, size
);
6149 write_inferior_data_ptr (ptr
6150 + offsetof (struct trace_state_variable
,
6155 if (tsv
->getter
!= NULL
)
6157 fatal ("what to do with these?");
6163 /* Fixup the next pointer in the last item in the list. */
6164 write_inferior_data_ptr (prev_ptr
6165 + offsetof (struct trace_state_variable
,
6170 /* Upload complete trace frames out of the IP Agent's trace buffer
6171 into GDBserver's trace buffer. This always uploads either all or
6172 no trace frames. This is the counter part of
6173 `trace_alloc_trace_buffer'. See its description of the atomic
6174 synching mechanism. */
6177 upload_fast_traceframes (void)
6179 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6180 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6182 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6183 unsigned int curr_tbctrl_idx
;
6184 unsigned int ipa_trace_buffer_ctrl_curr
;
6185 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6186 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6187 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6188 CORE_ADDR ipa_trace_buffer_lo
;
6189 CORE_ADDR ipa_trace_buffer_hi
;
6191 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6192 &ipa_traceframe_read_count_racy
))
6194 /* This will happen in most targets if the current thread is
6199 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6200 &ipa_traceframe_write_count_racy
))
6203 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6204 ipa_traceframe_write_count_racy
6205 - ipa_traceframe_read_count_racy
,
6206 ipa_traceframe_write_count_racy
,
6207 ipa_traceframe_read_count_racy
);
6209 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6212 about_to_request_buffer_space_bkpt
6213 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6216 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6217 &ipa_trace_buffer_ctrl_curr
))
6220 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6222 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6225 unsigned int prev
, counter
;
6227 /* Update the token, with new counters, and the GDBserver stamp
6228 bit. Alway reuse the current TBC index. */
6229 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6230 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6232 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6238 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6239 ipa_trace_buffer_ctrl_curr
))
6242 trace_debug ("Lib: Committed %08x -> %08x",
6243 ipa_trace_buffer_ctrl_curr_old
,
6244 ipa_trace_buffer_ctrl_curr
);
6246 /* Re-read these, now that we've installed the
6247 `about_to_request_buffer_space' breakpoint/lock. A thread could
6248 have finished a traceframe between the last read of these
6249 counters and setting the breakpoint above. If we start
6250 uploading, we never want to leave this function with
6251 traceframe_read_count != 0, otherwise, GDBserver could end up
6252 incrementing the counter tokens more than once (due to event loop
6253 nesting), which would break the IP agent's "effective" detection
6254 (see trace_alloc_trace_buffer). */
6255 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6256 &ipa_traceframe_read_count
))
6258 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6259 &ipa_traceframe_write_count
))
6264 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6265 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6266 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6268 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6269 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6270 trace_debug ("note that ipa_traceframe_count's parts changed");
6273 /* Get the address of the current TBC object (the IP agent has an
6274 array of 3 such objects). The index is stored in the TBC
6276 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6277 ipa_trace_buffer_ctrl_addr
6278 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6280 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6281 (unsigned char *) &ipa_trace_buffer_ctrl
,
6282 sizeof (struct ipa_trace_buffer_control
)))
6285 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6286 &ipa_trace_buffer_lo
))
6288 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6289 &ipa_trace_buffer_hi
))
6292 /* Offsets are easier to grok for debugging than raw addresses,
6293 especially for the small trace buffer sizes that are useful for
6295 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6296 "endfree=%d wrap=%d hi=%d",
6298 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6299 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6300 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6301 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6302 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6304 /* Note that the IPA's buffer is always circular. */
6306 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6308 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6309 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6311 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6312 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6313 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6314 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6317 tf
= IPA_FIRST_TRACEFRAME ();
6319 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6321 struct tracepoint
*tpoint
;
6322 struct traceframe
*tframe
;
6323 unsigned char *block
;
6324 struct traceframe ipa_tframe
;
6326 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6327 offsetof (struct traceframe
, data
)))
6328 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6330 if (ipa_tframe
.tpnum
== 0)
6331 fatal ("Uploading: No (more) fast traceframes, but "
6332 "ipa_traceframe_count == %u??\n",
6333 ipa_traceframe_write_count
- ipa_traceframe_read_count
);
6335 /* Note that this will be incorrect for multi-location
6337 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6339 tframe
= add_traceframe (tpoint
);
6342 trace_buffer_is_full
= 1;
6343 trace_debug ("Uploading: trace buffer is full");
6347 /* Copy the whole set of blocks in one go for now. FIXME:
6348 split this in smaller blocks. */
6349 block
= add_traceframe_block (tframe
, ipa_tframe
.data_size
);
6352 if (read_inferior_memory (tf
6353 + offsetof (struct traceframe
, data
),
6354 block
, ipa_tframe
.data_size
))
6355 error ("Uploading: Couldn't read traceframe data at %s\n",
6356 paddress (tf
+ offsetof (struct traceframe
, data
)));
6359 trace_debug ("Uploading: traceframe didn't fit");
6360 finish_traceframe (tframe
);
6363 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6365 /* If we freed the traceframe that wrapped around, go back
6366 to the non-wrap case. */
6367 if (tf
< ipa_trace_buffer_ctrl
.start
)
6369 trace_debug ("Lib: Discarding past the wraparound");
6370 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6372 ipa_trace_buffer_ctrl
.start
= tf
;
6373 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6374 ++ipa_traceframe_read_count
;
6376 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6377 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6379 trace_debug ("Lib: buffer is fully empty. "
6380 "Trace buffer [%d] start=%d free=%d endfree=%d",
6382 (int) (ipa_trace_buffer_ctrl
.start
6383 - ipa_trace_buffer_lo
),
6384 (int) (ipa_trace_buffer_ctrl
.free
6385 - ipa_trace_buffer_lo
),
6386 (int) (ipa_trace_buffer_ctrl
.end_free
6387 - ipa_trace_buffer_lo
));
6389 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6390 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6391 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6392 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6395 trace_debug ("Uploaded a traceframe\n"
6396 "Lib: Trace buffer [%d] start=%d free=%d "
6397 "endfree=%d wrap=%d hi=%d",
6399 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6400 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6401 (int) (ipa_trace_buffer_ctrl
.end_free
6402 - ipa_trace_buffer_lo
),
6403 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6404 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6407 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6408 (unsigned char *) &ipa_trace_buffer_ctrl
,
6409 sizeof (struct ipa_trace_buffer_control
)))
6412 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6413 ipa_traceframe_read_count
);
6415 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6418 cancel_breakpoints ();
6420 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6421 about_to_request_buffer_space_bkpt
= NULL
;
6425 if (trace_buffer_is_full
)
6430 #ifdef IN_PROCESS_AGENT
6432 IP_AGENT_EXPORT
int ust_loaded
;
6433 IP_AGENT_EXPORT
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6437 /* Static tracepoints. */
6439 /* UST puts a "struct tracepoint" in the global namespace, which
6440 conflicts with our tracepoint. Arguably, being a library, it
6441 shouldn't take ownership of such a generic name. We work around it
6443 #define tracepoint ust_tracepoint
6444 #include <ust/ust.h>
6447 extern int serialize_to_text (char *outbuf
, int bufsize
,
6448 const char *fmt
, va_list ap
);
6450 #define GDB_PROBE_NAME "gdb"
6452 /* We dynamically search for the UST symbols instead of linking them
6453 in. This lets the user decide if the application uses static
6454 tracepoints, instead of always pulling libust.so in. This vector
6455 holds pointers to all functions we care about. */
6459 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6460 const char *fmt
, va_list ap
);
6462 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6463 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6465 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6467 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6470 void (*marker_iter_start
) (struct marker_iter
*iter
);
6471 void (*marker_iter_next
) (struct marker_iter
*iter
);
6472 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6473 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6478 /* Cast through typeof to catch incompatible API changes. Since UST
6479 only builds with gcc, we can freely use gcc extensions here
6481 #define GET_UST_SYM(SYM) \
6484 if (ust_ops.SYM == NULL) \
6485 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6486 if (ust_ops.SYM == NULL) \
6490 #define USTF(SYM) ust_ops.SYM
6492 /* Get pointers to all libust.so functions we care about. */
6497 GET_UST_SYM (serialize_to_text
);
6499 GET_UST_SYM (ltt_probe_register
);
6500 GET_UST_SYM (ltt_probe_unregister
);
6501 GET_UST_SYM (ltt_marker_connect
);
6502 GET_UST_SYM (ltt_marker_disconnect
);
6504 GET_UST_SYM (marker_iter_start
);
6505 GET_UST_SYM (marker_iter_next
);
6506 GET_UST_SYM (marker_iter_stop
);
6507 GET_UST_SYM (marker_iter_reset
);
6513 /* Given an UST marker, return the matching gdb static tracepoint.
6514 The match is done by address. */
6516 static struct tracepoint
*
6517 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6519 struct tracepoint
*tpoint
;
6521 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6523 if (tpoint
->type
!= static_tracepoint
)
6526 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6533 /* The probe function we install on lttng/ust markers. Whenever a
6534 probed ust marker is hit, this function is called. This is similar
6535 to gdb_collect, only for static tracepoints, instead of fast
6539 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6540 struct registers
*regs
, void *call_private
,
6541 const char *fmt
, va_list *args
)
6543 struct tracepoint
*tpoint
;
6544 struct static_tracepoint_ctx ctx
;
6546 /* Don't do anything until the trace run is completely set up. */
6549 trace_debug ("gdb_probe: not tracing\n");
6553 ctx
.base
.type
= static_tracepoint
;
6554 ctx
.regcache_initted
= 0;
6559 /* Wrap the regblock in a register cache (in the stack, we don't
6560 want to malloc here). */
6561 ctx
.regspace
= alloca (register_cache_size ());
6562 if (ctx
.regspace
== NULL
)
6564 trace_debug ("Trace buffer block allocation failed, skipping");
6568 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6571 trace_debug ("gdb_probe: marker not known: "
6572 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6573 mdata
->location
, mdata
->channel
,
6574 mdata
->name
, mdata
->format
);
6578 if (!tpoint
->enabled
)
6580 trace_debug ("gdb_probe: tracepoint disabled");
6584 ctx
.tpoint
= tpoint
;
6586 trace_debug ("gdb_probe: collecting marker: "
6587 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6588 mdata
->location
, mdata
->channel
,
6589 mdata
->name
, mdata
->format
);
6591 /* Test the condition if present, and collect if true. */
6592 if (tpoint
->cond
== NULL
6593 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6596 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6597 tpoint
->address
, tpoint
);
6599 if (stopping_tracepoint
6600 || trace_buffer_is_full
6601 || expr_eval_result
!= expr_eval_no_error
)
6606 /* If there was a condition and it evaluated to false, the only
6607 way we would stop tracing is if there was an error during
6608 condition expression evaluation. */
6609 if (expr_eval_result
!= expr_eval_no_error
)
6614 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6615 static tracepoint string data. This is a string passed to the
6616 tracing library by the user, at the time of the tracepoint marker
6617 call. E.g., in the UST marker call:
6619 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6621 the collected data is "str FOOBAZ".
6625 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6626 struct traceframe
*tframe
)
6628 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6629 unsigned char *bufspace
;
6632 unsigned short blocklen
;
6636 trace_debug ("Wanted to collect static trace data, "
6637 "but there's no static trace data");
6641 va_copy (copy
, *umd
->args
);
6642 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6645 trace_debug ("Want to collect ust data");
6647 /* 'S' + size + string */
6648 bufspace
= add_traceframe_block (tframe
,
6649 1 + sizeof (blocklen
) + size
+ 1);
6650 if (bufspace
== NULL
)
6652 trace_debug ("Trace buffer block allocation failed, skipping");
6656 /* Identify a static trace data block. */
6659 blocklen
= size
+ 1;
6660 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6662 va_copy (copy
, *umd
->args
);
6663 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6664 size
+ 1, umd
->fmt
, copy
);
6667 trace_debug ("Storing static tracepoint data in regblock: %s",
6668 bufspace
+ 1 + sizeof (blocklen
));
6671 /* The probe to register with lttng/ust. */
6672 static struct ltt_available_probe gdb_ust_probe
=
6679 #endif /* HAVE_UST */
6680 #endif /* IN_PROCESS_AGENT */
6682 #ifndef IN_PROCESS_AGENT
6684 /* Ask the in-process agent to run a command. Since we don't want to
6685 have to handle the IPA hitting breakpoints while running the
6686 command, we pause all threads, remove all breakpoints, and then set
6687 the helper thread re-running. We communicate with the helper
6688 thread by means of direct memory xfering, and a socket for
6692 run_inferior_command (char *cmd
, int len
)
6695 int pid
= ptid_get_pid (current_inferior
->entry
.id
);
6697 trace_debug ("run_inferior_command: running: %s", cmd
);
6700 uninsert_all_breakpoints ();
6702 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6704 reinsert_all_breakpoints ();
6710 #else /* !IN_PROCESS_AGENT */
6712 #include <sys/socket.h>
6715 #ifndef UNIX_PATH_MAX
6716 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6719 /* Where we put the socked used for synchronization. */
6720 #define SOCK_DIR P_tmpdir
6722 /* Thread ID of the helper thread. GDBserver reads this to know which
6723 is the help thread. This is an LWP id on Linux. */
6724 int helper_thread_id
;
6727 init_named_socket (const char *name
)
6730 struct sockaddr_un addr
;
6732 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6735 warning ("socket creation failed: %s", strerror (errno
));
6739 addr
.sun_family
= AF_UNIX
;
6741 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6742 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6744 result
= access (name
, F_OK
);
6748 result
= unlink (name
);
6751 warning ("unlink failed: %s", strerror (errno
));
6755 warning ("socket %s already exists; overwriting", name
);
6758 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6761 warning ("bind failed: %s", strerror (errno
));
6766 result
= listen (fd
, 1);
6769 warning ("listen: %s", strerror (errno
));
6777 static char agent_socket_name
[UNIX_PATH_MAX
];
6780 gdb_agent_socket_init (void)
6784 result
= xsnprintf (agent_socket_name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6785 SOCK_DIR
, getpid ());
6786 if (result
>= UNIX_PATH_MAX
)
6788 trace_debug ("string overflow allocating socket name");
6792 fd
= init_named_socket (agent_socket_name
);
6794 warning ("Error initializing named socket (%s) for communication with the "
6795 "ust helper thread. Check that directory exists and that it "
6796 "is writable.", agent_socket_name
);
6803 /* The next marker to be returned on a qTsSTM command. */
6804 static const struct marker
*next_st
;
6806 /* Returns the first known marker. */
6811 struct marker_iter iter
;
6813 USTF(marker_iter_reset
) (&iter
);
6814 USTF(marker_iter_start
) (&iter
);
6819 /* Returns the marker following M. */
6821 const struct marker
*
6822 next_marker (const struct marker
*m
)
6824 struct marker_iter iter
;
6826 USTF(marker_iter_reset
) (&iter
);
6827 USTF(marker_iter_start
) (&iter
);
6829 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6831 if (iter
.marker
== m
)
6833 USTF(marker_iter_next
) (&iter
);
6841 /* Return an hexstr version of the STR C string, fit for sending to
6845 cstr_to_hexstr (const char *str
)
6847 int len
= strlen (str
);
6848 char *hexstr
= xmalloc (len
* 2 + 1);
6849 convert_int_to_ascii ((gdb_byte
*) str
, hexstr
, len
);
6853 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6857 response_ust_marker (char *packet
, const struct marker
*st
)
6859 char *strid
, *format
, *tmp
;
6861 next_st
= next_marker (st
);
6863 tmp
= xmalloc (strlen (st
->channel
) + 1 +
6864 strlen (st
->name
) + 1);
6865 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
6867 strid
= cstr_to_hexstr (tmp
);
6870 format
= cstr_to_hexstr (st
->format
);
6872 sprintf (packet
, "m%s:%s:%s",
6873 paddress ((uintptr_t) st
->location
),
6881 /* Return the first static tracepoint, and initialize the state
6882 machine that will iterate through all the static tracepoints. */
6885 cmd_qtfstm (char *packet
)
6887 trace_debug ("Returning first trace state variable definition");
6889 if (first_marker ())
6890 response_ust_marker (packet
, first_marker ());
6892 strcpy (packet
, "l");
6895 /* Return additional trace state variable definitions. */
6898 cmd_qtsstm (char *packet
)
6900 trace_debug ("Returning static tracepoint");
6903 response_ust_marker (packet
, next_st
);
6905 strcpy (packet
, "l");
6908 /* Disconnect the GDB probe from a marker at a given address. */
6911 unprobe_marker_at (char *packet
)
6915 struct marker_iter iter
;
6917 p
+= sizeof ("unprobe_marker_at:") - 1;
6919 p
= unpack_varlen_hex (p
, &address
);
6921 USTF(marker_iter_reset
) (&iter
);
6922 USTF(marker_iter_start
) (&iter
);
6923 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6924 if ((uintptr_t ) iter
.marker
->location
== address
)
6928 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
6932 warning ("could not disable marker %s/%s",
6933 iter
.marker
->channel
, iter
.marker
->name
);
6938 /* Connect the GDB probe to a marker at a given address. */
6941 probe_marker_at (char *packet
)
6945 struct marker_iter iter
;
6948 p
+= sizeof ("probe_marker_at:") - 1;
6950 p
= unpack_varlen_hex (p
, &address
);
6952 USTF(marker_iter_reset
) (&iter
);
6954 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
6956 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
6957 if ((uintptr_t ) m
->location
== address
)
6961 trace_debug ("found marker for address. "
6962 "ltt_marker_connect (marker = %s/%s)",
6963 m
->channel
, m
->name
);
6965 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
6967 if (result
&& result
!= -EEXIST
)
6968 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
6969 m
->channel
, m
->name
, -result
);
6973 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
6974 m
->channel
, m
->name
);
6978 strcpy (packet
, "OK");
6982 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
6987 cmd_qtstmat (char *packet
)
6991 struct marker_iter iter
;
6994 p
+= sizeof ("qTSTMat:") - 1;
6996 p
= unpack_varlen_hex (p
, &address
);
6998 USTF(marker_iter_reset
) (&iter
);
7000 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7002 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7003 if ((uintptr_t ) m
->location
== address
)
7005 response_ust_marker (packet
, m
);
7009 strcpy (packet
, "l");
7019 USTF(ltt_probe_register
) (&gdb_ust_probe
);
7022 #endif /* HAVE_UST */
7024 #include <sys/syscall.h>
7028 gdb_agent_remove_socket (void)
7030 unlink (agent_socket_name
);
7033 /* Helper thread of agent. */
7036 gdb_agent_helper_thread (void *arg
)
7040 atexit (gdb_agent_remove_socket
);
7044 listen_fd
= gdb_agent_socket_init ();
7046 if (helper_thread_id
== 0)
7047 helper_thread_id
= syscall (SYS_gettid
);
7049 if (listen_fd
== -1)
7051 warning ("could not create sync socket\n");
7058 struct sockaddr_un sockaddr
;
7064 tmp
= sizeof (sockaddr
);
7068 fd
= accept (listen_fd
, &sockaddr
, &tmp
);
7070 /* It seems an ERESTARTSYS can escape out of accept. */
7071 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7075 warning ("Accept returned %d, error: %s\n",
7076 fd
, strerror (errno
));
7082 ret
= read (fd
, buf
, 1);
7083 } while (ret
== -1 && errno
== EINTR
);
7087 warning ("reading socket (fd=%d) failed with %s",
7088 fd
, strerror (errno
));
7095 if (strncmp ("close", cmd_buf
, 5) == 0)
7100 else if (strcmp ("qTfSTM", cmd_buf
) == 0)
7102 cmd_qtfstm (cmd_buf
);
7104 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7106 cmd_qtsstm (cmd_buf
);
7108 else if (strncmp ("unprobe_marker_at:",
7110 sizeof ("unprobe_marker_at:") - 1) == 0)
7112 unprobe_marker_at (cmd_buf
);
7114 else if (strncmp ("probe_marker_at:",
7116 sizeof ("probe_marker_at:") - 1) == 0)
7118 probe_marker_at (cmd_buf
);
7120 else if (strncmp ("qTSTMat:",
7122 sizeof ("qTSTMat:") - 1) == 0)
7124 cmd_qtstmat (cmd_buf
);
7126 #endif /* HAVE_UST */
7129 /* Fix compiler's warning: ignoring return value of 'write'. */
7130 ret
= write (fd
, buf
, 1);
7136 unlink (agent_socket_name
);
7138 /* Sleep endlessly to wait the whole inferior stops. This
7139 thread can not exit because GDB or GDBserver may still need
7140 'current_inferior' (representing this thread) to access
7141 inferior memory. Otherwise, this thread exits earlier than
7142 other threads, and 'current_inferior' is set to NULL. */
7153 #include <pthread.h>
7155 IP_AGENT_EXPORT
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7158 gdb_agent_init (void)
7165 /* We want the helper thread to be as transparent as possible, so
7166 have it inherit an all-signals-blocked mask. */
7168 sigfillset (&new_mask
);
7169 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7171 fatal ("pthread_sigmask (1) failed: %s", strerror (res
));
7173 res
= pthread_create (&thread
,
7175 gdb_agent_helper_thread
,
7178 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7180 fatal ("pthread_sigmask (2) failed: %s", strerror (res
));
7182 while (helper_thread_id
== 0)
7190 #include <sys/mman.h>
7193 IP_AGENT_EXPORT
char *gdb_tp_heap_buffer
;
7194 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer
;
7195 IP_AGENT_EXPORT
char *gdb_jump_pad_buffer_end
;
7196 IP_AGENT_EXPORT
char *gdb_trampoline_buffer
;
7197 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_end
;
7198 IP_AGENT_EXPORT
char *gdb_trampoline_buffer_error
;
7200 /* Record the result of getting buffer space for fast tracepoint
7201 trampolines. Any error message is copied, since caller may not be
7202 using persistent storage. */
7205 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7207 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7208 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7210 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7212 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7215 static void __attribute__ ((constructor
))
7216 initialize_tracepoint_ftlib (void)
7218 initialize_tracepoint ();
7223 #endif /* IN_PROCESS_AGENT */
7225 /* Return a timestamp, expressed as microseconds of the usual Unix
7226 time. (As the result is a 64-bit number, it will not overflow any
7230 get_timestamp (void)
7234 if (gettimeofday (&tv
, 0) != 0)
7237 return (LONGEST
) tv
.tv_sec
* 1000000 + tv
.tv_usec
;
7241 initialize_tracepoint (void)
7243 /* There currently no way to change the buffer size. */
7244 const int sizeOfBuffer
= 5 * 1024 * 1024;
7245 unsigned char *buf
= xmalloc (sizeOfBuffer
);
7246 init_trace_buffer (buf
, sizeOfBuffer
);
7248 /* Wire trace state variable 1 to be the timestamp. This will be
7249 uploaded to GDB upon connection and become one of its trace state
7250 variables. (In case you're wondering, if GDB already has a trace
7251 variable numbered 1, it will be renumbered.) */
7252 create_trace_state_variable (1, 0);
7253 set_trace_state_variable_name (1, "trace_timestamp");
7254 set_trace_state_variable_getter (1, get_timestamp
);
7256 #ifdef IN_PROCESS_AGENT
7261 pagesize
= sysconf (_SC_PAGE_SIZE
);
7265 gdb_tp_heap_buffer
= xmalloc (5 * 1024 * 1024);
7267 #define SCRATCH_BUFFER_NPAGES 20
7269 /* Allocate scratch buffer aligned on a page boundary, at a low
7270 address (close to the main executable's code). */
7271 for (addr
= pagesize
; addr
!= 0; addr
+= pagesize
)
7273 gdb_jump_pad_buffer
= mmap ((void *) addr
, pagesize
* SCRATCH_BUFFER_NPAGES
,
7274 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
7275 MAP_PRIVATE
| MAP_ANONYMOUS
| MAP_FIXED
,
7277 if (gdb_jump_pad_buffer
!= MAP_FAILED
)
7283 initialize_tracepoint: mmap'ing jump pad buffer failed with %s",
7286 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ pagesize
* SCRATCH_BUFFER_NPAGES
;
7289 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7291 /* It's not a fatal error for something to go wrong with trampoline
7292 buffer setup, but it can be mysterious, so create a channel to
7293 report back on what went wrong, using a fixed size since we may
7294 not be able to allocate space later when the problem occurs. */
7295 gdb_trampoline_buffer_error
= xmalloc (IPA_BUFSIZ
);
7297 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7299 initialize_low_tracepoint ();