1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "tracepoint.h"
21 #include "gdbthread.h"
28 #include "gdb_sys_time.h"
33 #define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */
35 /* This file is built for both GDBserver, and the in-process
36 agent (IPA), a shared library that includes a tracing agent that is
37 loaded by the inferior to support fast tracepoints. Fast
38 tracepoints (or more accurately, jump based tracepoints) are
39 implemented by patching the tracepoint location with a jump into a
40 small trampoline function whose job is to save the register state,
41 call the in-process tracing agent, and then execute the original
42 instruction that was under the tracepoint jump (possibly adjusted,
43 if PC-relative, or some such).
45 The current synchronization design is pull based. That means,
46 GDBserver does most of the work, by peeking/poking at the inferior
47 agent's memory directly for downloading tracepoint and associated
48 objects, and for uploading trace frames. Whenever the IPA needs
49 something from GDBserver (trace buffer is full, tracing stopped for
50 some reason, etc.) the IPA calls a corresponding hook function
51 where GDBserver has placed a breakpoint.
53 Each of the agents has its own trace buffer. When browsing the
54 trace frames built from slow and fast tracepoints from GDB (tfind
55 mode), there's no guarantee the user is seeing the trace frames in
56 strict chronological creation order, although, GDBserver tries to
57 keep the order relatively reasonable, by syncing the trace buffers
62 #ifdef IN_PROCESS_AGENT
64 static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
67 trace_vdebug (const char *fmt
, ...)
73 vsprintf (buf
, fmt
, ap
);
74 fprintf (stderr
, PROG
"/tracepoint: %s\n", buf
);
78 #define trace_debug_1(level, fmt, args...) \
80 if (level <= debug_threads) \
81 trace_vdebug ((fmt), ##args); \
86 #define trace_debug_1(level, fmt, args...) \
88 if (level <= debug_threads) \
90 debug_printf ((fmt), ##args); \
91 debug_printf ("\n"); \
97 #define trace_debug(FMT, args...) \
98 trace_debug_1 (1, FMT, ##args)
100 /* Prefix exported symbols, for good citizenship. All the symbols
101 that need exporting are defined in this module. Note that all
102 these symbols must be tagged with IP_AGENT_EXPORT_*. */
103 #ifdef IN_PROCESS_AGENT
104 # define gdb_tp_heap_buffer IPA_SYM_EXPORTED_NAME (gdb_tp_heap_buffer)
105 # define gdb_jump_pad_buffer IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer)
106 # define gdb_jump_pad_buffer_end IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer_end)
107 # define gdb_trampoline_buffer IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer)
108 # define gdb_trampoline_buffer_end IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_end)
109 # define gdb_trampoline_buffer_error IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_error)
110 # define collecting IPA_SYM_EXPORTED_NAME (collecting)
111 # define gdb_collect IPA_SYM_EXPORTED_NAME (gdb_collect)
112 # define stop_tracing IPA_SYM_EXPORTED_NAME (stop_tracing)
113 # define flush_trace_buffer IPA_SYM_EXPORTED_NAME (flush_trace_buffer)
114 # define about_to_request_buffer_space IPA_SYM_EXPORTED_NAME (about_to_request_buffer_space)
115 # define trace_buffer_is_full IPA_SYM_EXPORTED_NAME (trace_buffer_is_full)
116 # define stopping_tracepoint IPA_SYM_EXPORTED_NAME (stopping_tracepoint)
117 # define expr_eval_result IPA_SYM_EXPORTED_NAME (expr_eval_result)
118 # define error_tracepoint IPA_SYM_EXPORTED_NAME (error_tracepoint)
119 # define tracepoints IPA_SYM_EXPORTED_NAME (tracepoints)
120 # define tracing IPA_SYM_EXPORTED_NAME (tracing)
121 # define trace_buffer_ctrl IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl)
122 # define trace_buffer_ctrl_curr IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl_curr)
123 # define trace_buffer_lo IPA_SYM_EXPORTED_NAME (trace_buffer_lo)
124 # define trace_buffer_hi IPA_SYM_EXPORTED_NAME (trace_buffer_hi)
125 # define traceframe_read_count IPA_SYM_EXPORTED_NAME (traceframe_read_count)
126 # define traceframe_write_count IPA_SYM_EXPORTED_NAME (traceframe_write_count)
127 # define traceframes_created IPA_SYM_EXPORTED_NAME (traceframes_created)
128 # define trace_state_variables IPA_SYM_EXPORTED_NAME (trace_state_variables)
129 # define get_raw_reg IPA_SYM_EXPORTED_NAME (get_raw_reg)
130 # define get_trace_state_variable_value \
131 IPA_SYM_EXPORTED_NAME (get_trace_state_variable_value)
132 # define set_trace_state_variable_value \
133 IPA_SYM_EXPORTED_NAME (set_trace_state_variable_value)
134 # define ust_loaded IPA_SYM_EXPORTED_NAME (ust_loaded)
135 # define helper_thread_id IPA_SYM_EXPORTED_NAME (helper_thread_id)
136 # define cmd_buf IPA_SYM_EXPORTED_NAME (cmd_buf)
139 #ifndef IN_PROCESS_AGENT
141 /* Addresses of in-process agent's symbols GDBserver cares about. */
143 struct ipa_sym_addresses
145 CORE_ADDR addr_gdb_tp_heap_buffer
;
146 CORE_ADDR addr_gdb_jump_pad_buffer
;
147 CORE_ADDR addr_gdb_jump_pad_buffer_end
;
148 CORE_ADDR addr_gdb_trampoline_buffer
;
149 CORE_ADDR addr_gdb_trampoline_buffer_end
;
150 CORE_ADDR addr_gdb_trampoline_buffer_error
;
151 CORE_ADDR addr_collecting
;
152 CORE_ADDR addr_gdb_collect
;
153 CORE_ADDR addr_stop_tracing
;
154 CORE_ADDR addr_flush_trace_buffer
;
155 CORE_ADDR addr_about_to_request_buffer_space
;
156 CORE_ADDR addr_trace_buffer_is_full
;
157 CORE_ADDR addr_stopping_tracepoint
;
158 CORE_ADDR addr_expr_eval_result
;
159 CORE_ADDR addr_error_tracepoint
;
160 CORE_ADDR addr_tracepoints
;
161 CORE_ADDR addr_tracing
;
162 CORE_ADDR addr_trace_buffer_ctrl
;
163 CORE_ADDR addr_trace_buffer_ctrl_curr
;
164 CORE_ADDR addr_trace_buffer_lo
;
165 CORE_ADDR addr_trace_buffer_hi
;
166 CORE_ADDR addr_traceframe_read_count
;
167 CORE_ADDR addr_traceframe_write_count
;
168 CORE_ADDR addr_traceframes_created
;
169 CORE_ADDR addr_trace_state_variables
;
170 CORE_ADDR addr_get_raw_reg
;
171 CORE_ADDR addr_get_trace_state_variable_value
;
172 CORE_ADDR addr_set_trace_state_variable_value
;
173 CORE_ADDR addr_ust_loaded
;
181 IPA_SYM(gdb_tp_heap_buffer
),
182 IPA_SYM(gdb_jump_pad_buffer
),
183 IPA_SYM(gdb_jump_pad_buffer_end
),
184 IPA_SYM(gdb_trampoline_buffer
),
185 IPA_SYM(gdb_trampoline_buffer_end
),
186 IPA_SYM(gdb_trampoline_buffer_error
),
188 IPA_SYM(gdb_collect
),
189 IPA_SYM(stop_tracing
),
190 IPA_SYM(flush_trace_buffer
),
191 IPA_SYM(about_to_request_buffer_space
),
192 IPA_SYM(trace_buffer_is_full
),
193 IPA_SYM(stopping_tracepoint
),
194 IPA_SYM(expr_eval_result
),
195 IPA_SYM(error_tracepoint
),
196 IPA_SYM(tracepoints
),
198 IPA_SYM(trace_buffer_ctrl
),
199 IPA_SYM(trace_buffer_ctrl_curr
),
200 IPA_SYM(trace_buffer_lo
),
201 IPA_SYM(trace_buffer_hi
),
202 IPA_SYM(traceframe_read_count
),
203 IPA_SYM(traceframe_write_count
),
204 IPA_SYM(traceframes_created
),
205 IPA_SYM(trace_state_variables
),
206 IPA_SYM(get_raw_reg
),
207 IPA_SYM(get_trace_state_variable_value
),
208 IPA_SYM(set_trace_state_variable_value
),
212 static struct ipa_sym_addresses ipa_sym_addrs
;
214 static int read_inferior_integer (CORE_ADDR symaddr
, int *val
);
216 /* Returns true if both the in-process agent library and the static
217 tracepoints libraries are loaded in the inferior, and agent has
218 capability on static tracepoints. */
221 in_process_agent_supports_ust (void)
225 if (!agent_loaded_p ())
227 warning ("In-process agent not loaded");
231 if (agent_capability_check (AGENT_CAPA_STATIC_TRACE
))
233 /* Agent understands static tracepoint, then check whether UST is in
234 fact loaded in the inferior. */
235 if (read_inferior_integer (ipa_sym_addrs
.addr_ust_loaded
, &loaded
))
237 warning ("Error reading ust_loaded in lib");
248 write_e_ipa_not_loaded (char *buffer
)
251 "E.In-process agent library not loaded in process. "
252 "Fast and static tracepoints unavailable.");
255 /* Write an error to BUFFER indicating that UST isn't loaded in the
259 write_e_ust_not_loaded (char *buffer
)
263 "E.UST library not loaded in process. "
264 "Static tracepoints unavailable.");
266 sprintf (buffer
, "E.GDBserver was built without static tracepoints support");
270 /* If the in-process agent library isn't loaded in the inferior, write
271 an error to BUFFER, and return 1. Otherwise, return 0. */
274 maybe_write_ipa_not_loaded (char *buffer
)
276 if (!agent_loaded_p ())
278 write_e_ipa_not_loaded (buffer
);
284 /* If the in-process agent library and the ust (static tracepoints)
285 library aren't loaded in the inferior, write an error to BUFFER,
286 and return 1. Otherwise, return 0. */
289 maybe_write_ipa_ust_not_loaded (char *buffer
)
291 if (!agent_loaded_p ())
293 write_e_ipa_not_loaded (buffer
);
296 else if (!in_process_agent_supports_ust ())
298 write_e_ust_not_loaded (buffer
);
304 /* Cache all future symbols that the tracepoints module might request.
305 We can not request symbols at arbitrary states in the remote
306 protocol, only when the client tells us that new symbols are
307 available. So when we load the in-process library, make sure to
308 check the entire list. */
311 tracepoint_look_up_symbols (void)
315 if (agent_loaded_p ())
318 for (i
= 0; i
< sizeof (symbol_list
) / sizeof (symbol_list
[0]); i
++)
321 (CORE_ADDR
*) ((char *) &ipa_sym_addrs
+ symbol_list
[i
].offset
);
323 if (look_up_one_symbol (symbol_list
[i
].name
, addrp
, 1) == 0)
326 debug_printf ("symbol `%s' not found\n", symbol_list
[i
].name
);
331 agent_look_up_symbols (NULL
);
336 /* GDBserver places a breakpoint on the IPA's version (which is a nop)
337 of the "stop_tracing" function. When this breakpoint is hit,
338 tracing stopped in the IPA for some reason. E.g., due to
339 tracepoint reaching the pass count, hitting conditional expression
340 evaluation error, etc.
342 The IPA's trace buffer is never in circular tracing mode: instead,
343 GDBserver's is, and whenever the in-process buffer fills, it calls
344 "flush_trace_buffer", which triggers an internal breakpoint.
345 GDBserver reacts to this breakpoint by pulling the meanwhile
346 collected data. Old frames discarding is always handled on the
349 #ifdef IN_PROCESS_AGENT
351 read_inferior_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
353 memcpy (myaddr
, (void *) (uintptr_t) memaddr
, len
);
357 /* Call this in the functions where GDBserver places a breakpoint, so
358 that the compiler doesn't try to be clever and skip calling the
359 function at all. This is necessary, even if we tell the compiler
360 to not inline said functions. */
362 #if defined(__GNUC__)
363 # define UNKNOWN_SIDE_EFFECTS() asm ("")
365 # define UNKNOWN_SIDE_EFFECTS() do {} while (0)
368 IP_AGENT_EXPORT_FUNC
void
371 /* GDBserver places breakpoint here. */
372 UNKNOWN_SIDE_EFFECTS();
375 IP_AGENT_EXPORT_FUNC
void
376 flush_trace_buffer (void)
378 /* GDBserver places breakpoint here. */
379 UNKNOWN_SIDE_EFFECTS();
384 #ifndef IN_PROCESS_AGENT
386 tracepoint_handler (CORE_ADDR address
)
388 trace_debug ("tracepoint_handler: tracepoint at 0x%s hit",
393 /* Breakpoint at "stop_tracing" in the inferior lib. */
394 struct breakpoint
*stop_tracing_bkpt
;
395 static int stop_tracing_handler (CORE_ADDR
);
397 /* Breakpoint at "flush_trace_buffer" in the inferior lib. */
398 struct breakpoint
*flush_trace_buffer_bkpt
;
399 static int flush_trace_buffer_handler (CORE_ADDR
);
401 static void download_trace_state_variables (void);
402 static void upload_fast_traceframes (void);
404 static int run_inferior_command (char *cmd
, int len
);
407 read_inferior_integer (CORE_ADDR symaddr
, int *val
)
409 return read_inferior_memory (symaddr
, (unsigned char *) val
,
414 static int tracepoint_send_agent (struct tracepoint
*tpoint
);
417 read_inferior_uinteger (CORE_ADDR symaddr
, unsigned int *val
)
419 return read_inferior_memory (symaddr
, (unsigned char *) val
,
424 read_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR
*val
)
426 void *pval
= (void *) (uintptr_t) val
;
429 ret
= read_inferior_memory (symaddr
, (unsigned char *) &pval
, sizeof (pval
));
430 *val
= (uintptr_t) pval
;
435 write_inferior_data_pointer (CORE_ADDR symaddr
, CORE_ADDR val
)
437 void *pval
= (void *) (uintptr_t) val
;
438 return write_inferior_memory (symaddr
,
439 (unsigned char *) &pval
, sizeof (pval
));
443 write_inferior_integer (CORE_ADDR symaddr
, int val
)
445 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
449 write_inferior_uinteger (CORE_ADDR symaddr
, unsigned int val
)
451 return write_inferior_memory (symaddr
, (unsigned char *) &val
, sizeof (val
));
454 static CORE_ADDR
target_malloc (ULONGEST size
);
455 static int write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
);
457 #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \
459 memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \
460 BUF += sizeof ((OBJ)->FIELD); \
465 /* Operations on various types of tracepoint actions. */
467 struct tracepoint_action
;
469 struct tracepoint_action_ops
471 /* Download tracepoint action ACTION to IPA. Return the address of action
473 CORE_ADDR (*download
) (const struct tracepoint_action
*action
);
475 /* Send ACTION to agent via command buffer started from BUFFER. Return
476 updated head of command buffer. */
477 char* (*send
) (char *buffer
, const struct tracepoint_action
*action
);
480 /* Base action. Concrete actions inherit this. */
482 struct tracepoint_action
484 #ifndef IN_PROCESS_AGENT
485 const struct tracepoint_action_ops
*ops
;
490 /* An 'M' (collect memory) action. */
491 struct collect_memory_action
493 struct tracepoint_action base
;
500 /* An 'R' (collect registers) action. */
502 struct collect_registers_action
504 struct tracepoint_action base
;
507 /* An 'X' (evaluate expression) action. */
509 struct eval_expr_action
511 struct tracepoint_action base
;
513 struct agent_expr
*expr
;
516 /* An 'L' (collect static trace data) action. */
517 struct collect_static_trace_data_action
519 struct tracepoint_action base
;
522 #ifndef IN_PROCESS_AGENT
524 m_tracepoint_action_download (const struct tracepoint_action
*action
)
526 int size_in_ipa
= (sizeof (struct collect_memory_action
)
527 - offsetof (struct tracepoint_action
, type
));
528 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
530 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
536 m_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
538 struct collect_memory_action
*maction
539 = (struct collect_memory_action
*) action
;
541 COPY_FIELD_TO_BUF (buffer
, maction
, addr
);
542 COPY_FIELD_TO_BUF (buffer
, maction
, len
);
543 COPY_FIELD_TO_BUF (buffer
, maction
, basereg
);
548 static const struct tracepoint_action_ops m_tracepoint_action_ops
=
550 m_tracepoint_action_download
,
551 m_tracepoint_action_send
,
555 r_tracepoint_action_download (const struct tracepoint_action
*action
)
557 int size_in_ipa
= (sizeof (struct collect_registers_action
)
558 - offsetof (struct tracepoint_action
, type
));
559 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
561 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
568 r_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
573 static const struct tracepoint_action_ops r_tracepoint_action_ops
=
575 r_tracepoint_action_download
,
576 r_tracepoint_action_send
,
579 static CORE_ADDR
download_agent_expr (struct agent_expr
*expr
);
582 x_tracepoint_action_download (const struct tracepoint_action
*action
)
584 int size_in_ipa
= (sizeof (struct eval_expr_action
)
585 - offsetof (struct tracepoint_action
, type
));
586 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
589 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
591 expr
= download_agent_expr (((struct eval_expr_action
*)action
)->expr
);
592 write_inferior_data_ptr (ipa_action
+ offsetof (struct eval_expr_action
, expr
)
593 - offsetof (struct tracepoint_action
, type
),
599 /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL,
600 copy 0 to P. Return updated header of buffer. */
603 agent_expr_send (char *p
, const struct agent_expr
*aexpr
)
605 /* Copy the length of condition first, and then copy its
614 memcpy (p
, &aexpr
->length
, 4);
617 memcpy (p
, aexpr
->bytes
, aexpr
->length
);
624 x_tracepoint_action_send ( char *buffer
, const struct tracepoint_action
*action
)
626 struct eval_expr_action
*eaction
= (struct eval_expr_action
*) action
;
628 return agent_expr_send (buffer
, eaction
->expr
);
631 static const struct tracepoint_action_ops x_tracepoint_action_ops
=
633 x_tracepoint_action_download
,
634 x_tracepoint_action_send
,
638 l_tracepoint_action_download (const struct tracepoint_action
*action
)
640 int size_in_ipa
= (sizeof (struct collect_static_trace_data_action
)
641 - offsetof (struct tracepoint_action
, type
));
642 CORE_ADDR ipa_action
= target_malloc (size_in_ipa
);
644 write_inferior_memory (ipa_action
, (unsigned char *) &action
->type
,
651 l_tracepoint_action_send (char *buffer
, const struct tracepoint_action
*action
)
656 static const struct tracepoint_action_ops l_tracepoint_action_ops
=
658 l_tracepoint_action_download
,
659 l_tracepoint_action_send
,
663 /* This structure describes a piece of the source-level definition of
664 the tracepoint. The contents are not interpreted by the target,
665 but preserved verbatim for uploading upon reconnection. */
669 /* The type of string, such as "cond" for a conditional. */
672 /* The source-level string itself. For the sake of target
673 debugging, we store it in plaintext, even though it is always
674 transmitted in hex. */
677 /* Link to the next one in the list. We link them in the order
678 received, in case some make up an ordered list of commands or
680 struct source_string
*next
;
685 /* Trap based tracepoint. */
688 /* A fast tracepoint implemented with a jump instead of a trap. */
691 /* A static tracepoint, implemented by a program call into a tracing
696 struct tracepoint_hit_ctx
;
698 typedef enum eval_result_type (*condfn
) (struct tracepoint_hit_ctx
*,
701 /* The definition of a tracepoint. */
703 /* Tracepoints may have multiple locations, each at a different
704 address. This can occur with optimizations, template
705 instantiation, etc. Since the locations may be in different
706 scopes, the conditions and actions may be different for each
707 location. Our target version of tracepoints is more like GDB's
708 notion of "breakpoint locations", but we have almost nothing that
709 is not per-location, so we bother having two kinds of objects. The
710 key consequence is that numbers are not unique, and that it takes
711 both number and address to identify a tracepoint uniquely. */
715 /* The number of the tracepoint, as specified by GDB. Several
716 tracepoint objects here may share a number. */
719 /* Address at which the tracepoint is supposed to trigger. Several
720 tracepoints may share an address. */
723 /* Tracepoint type. */
724 enum tracepoint_type type
;
726 /* True if the tracepoint is currently enabled. */
729 /* The number of single steps that will be performed after each
733 /* The number of times the tracepoint may be hit before it will
734 terminate the entire tracing run. */
737 /* Pointer to the agent expression that is the tracepoint's
738 conditional, or NULL if the tracepoint is unconditional. */
739 struct agent_expr
*cond
;
741 /* The list of actions to take when the tracepoint triggers. */
743 struct tracepoint_action
**actions
;
745 /* Count of the times we've hit this tracepoint during the run.
746 Note that while-stepping steps are not counted as "hits". */
749 /* Cached sum of the sizes of traceframes created by this point. */
750 uint64_t traceframe_usage
;
752 CORE_ADDR compiled_cond
;
754 /* Link to the next tracepoint in the list. */
755 struct tracepoint
*next
;
757 #ifndef IN_PROCESS_AGENT
758 /* The list of actions to take when the tracepoint triggers, in
759 string/packet form. */
762 /* The collection of strings that describe the tracepoint as it was
763 entered into GDB. These are not used by the target, but are
764 reported back to GDB upon reconnection. */
765 struct source_string
*source_strings
;
767 /* The number of bytes displaced by fast tracepoints. It may subsume
768 multiple instructions, for multi-byte fast tracepoints. This
769 field is only valid for fast tracepoints. */
772 /* Only for fast tracepoints. */
773 CORE_ADDR obj_addr_on_target
;
775 /* Address range where the original instruction under a fast
776 tracepoint was relocated to. (_end is actually one byte past
778 CORE_ADDR adjusted_insn_addr
;
779 CORE_ADDR adjusted_insn_addr_end
;
781 /* The address range of the piece of the jump pad buffer that was
782 assigned to this fast tracepoint. (_end is actually one byte
785 CORE_ADDR jump_pad_end
;
787 /* The address range of the piece of the trampoline buffer that was
788 assigned to this fast tracepoint. (_end is actually one byte
790 CORE_ADDR trampoline
;
791 CORE_ADDR trampoline_end
;
793 /* The list of actions to take while in a stepping loop. These
794 fields are only valid for patch-based tracepoints. */
795 int num_step_actions
;
796 struct tracepoint_action
**step_actions
;
797 /* Same, but in string/packet form. */
798 char **step_actions_str
;
800 /* Handle returned by the breakpoint or tracepoint module when we
801 inserted the trap or jump, or hooked into a static tracepoint.
802 NULL if we haven't inserted it yet. */
808 #ifndef IN_PROCESS_AGENT
810 /* Given `while-stepping', a thread may be collecting data for more
811 than one tracepoint simultaneously. On the other hand, the same
812 tracepoint with a while-stepping action may be hit by more than one
813 thread simultaneously (but not quite, each thread could be handling
814 a different step). Each thread holds a list of these objects,
815 representing the current step of each while-stepping action being
820 struct wstep_state
*next
;
822 /* The tracepoint number. */
824 /* The tracepoint's address. */
825 CORE_ADDR tp_address
;
827 /* The number of the current step in this 'while-stepping'
836 /* The linked list of all tracepoints. Marked explicitly as used as
837 the in-process library doesn't use it for the fast tracepoints
839 IP_AGENT_EXPORT_VAR
struct tracepoint
*tracepoints
;
841 /* The first tracepoint to exceed its pass count. */
843 IP_AGENT_EXPORT_VAR
struct tracepoint
*stopping_tracepoint
;
845 /* True if the trace buffer is full or otherwise no longer usable. */
847 IP_AGENT_EXPORT_VAR
int trace_buffer_is_full
;
849 /* The first error that occurred during expression evaluation. */
851 /* Stored as an int to avoid the IPA ABI being dependent on whatever
852 the compiler decides to use for the enum's underlying type. Holds
853 enum eval_result_type values. */
854 IP_AGENT_EXPORT_VAR
int expr_eval_result
= expr_eval_no_error
;
858 #ifndef IN_PROCESS_AGENT
860 /* Pointer to the last tracepoint in the list, new tracepoints are
861 linked in at the end. */
863 static struct tracepoint
*last_tracepoint
;
865 static const char *eval_result_names
[] =
867 "terror:in the attic", /* this should never be reported */
868 "terror:empty expression",
869 "terror:empty stack",
870 "terror:stack overflow",
871 "terror:stack underflow",
872 "terror:unhandled opcode",
873 "terror:unrecognized opcode",
874 "terror:divide by zero"
879 /* The tracepoint in which the error occurred. */
882 IP_AGENT_EXPORT_VAR
struct tracepoint
*error_tracepoint
;
885 struct trace_state_variable
887 /* This is the name of the variable as used in GDB. The target
888 doesn't use the name, but needs to have it for saving and
889 reconnection purposes. */
892 /* This number identifies the variable uniquely. Numbers may be
893 assigned either by the target (in the case of builtin variables),
894 or by GDB, and are presumed unique during the course of a trace
898 /* The variable's initial value, a 64-bit signed integer always. */
899 LONGEST initial_value
;
901 /* The variable's value, a 64-bit signed integer always. */
904 /* Pointer to a getter function, used to supply computed values. */
905 LONGEST (*getter
) (void);
907 /* Link to the next variable. */
908 struct trace_state_variable
*next
;
911 /* Linked list of all trace state variables. */
913 #ifdef IN_PROCESS_AGENT
914 struct trace_state_variable
*alloced_trace_state_variables
;
917 IP_AGENT_EXPORT_VAR
struct trace_state_variable
*trace_state_variables
;
919 /* The results of tracing go into a fixed-size space known as the
920 "trace buffer". Because usage follows a limited number of
921 patterns, we manage it ourselves rather than with malloc. Basic
922 rules are that we create only one trace frame at a time, each is
923 variable in size, they are never moved once created, and we only
924 discard if we are doing a circular buffer, and then only the oldest
925 ones. Each trace frame includes its own size, so we don't need to
926 link them together, and the trace frame number is relative to the
927 first one, so we don't need to record numbers. A trace frame also
928 records the number of the tracepoint that created it. The data
929 itself is a series of blocks, each introduced by a single character
930 and with a defined format. Each type of block has enough
931 type/length info to allow scanners to jump quickly from one block
932 to the next without reading each byte in the block. */
934 /* Trace buffer management would be simple - advance a free pointer
935 from beginning to end, then stop - were it not for the circular
936 buffer option, which is a useful way to prevent a trace run from
937 stopping prematurely because the buffer filled up. In the circular
938 case, the location of the first trace frame (trace_buffer_start)
939 moves as old trace frames are discarded. Also, since we grow trace
940 frames incrementally as actions are performed, we wrap around to
941 the beginning of the trace buffer. This is per-block, so each
942 block within a trace frame remains contiguous. Things get messy
943 when the wrapped-around trace frame is the one being discarded; the
944 free space ends up in two parts at opposite ends of the buffer. */
947 # if defined(__GNUC__)
948 # define ATTR_PACKED __attribute__ ((packed))
950 # define ATTR_PACKED /* nothing */
954 /* The data collected at a tracepoint hit. This object should be as
955 small as possible, since there may be a great many of them. We do
956 not need to keep a frame number, because they are all sequential
957 and there are no deletions; so the Nth frame in the buffer is
958 always frame number N. */
962 /* Number of the tracepoint that collected this traceframe. A value
963 of 0 indicates the current end of the trace buffer. We make this
964 a 16-bit field because it's never going to happen that GDB's
965 numbering of tracepoints reaches 32,000. */
968 /* The size of the data in this trace frame. We limit this to 32
969 bits, even on a 64-bit target, because it's just implausible that
970 one is validly going to collect 4 gigabytes of data at a single
972 unsigned int data_size
: 32;
974 /* The base of the trace data, which is contiguous from this point. */
975 unsigned char data
[0];
979 /* The size of the EOB marker, in bytes. A traceframe with zeroed
980 fields (and no data) marks the end of trace data. */
981 #define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data)
983 /* The traceframe to be used as the source of data to send back to
984 GDB. A value of -1 means to get data from the live program. */
986 int current_traceframe
= -1;
988 /* This flag is true if the trace buffer is circular, meaning that
989 when it fills, the oldest trace frames are discarded in order to
992 #ifndef IN_PROCESS_AGENT
993 static int circular_trace_buffer
;
996 /* Size of the trace buffer. */
998 static LONGEST trace_buffer_size
;
1002 /* Pointer to the block of memory that traceframes all go into. */
1004 IP_AGENT_EXPORT_VAR
unsigned char *trace_buffer_lo
;
1006 /* Pointer to the end of the trace buffer, more precisely to the byte
1007 after the end of the buffer. */
1009 IP_AGENT_EXPORT_VAR
unsigned char *trace_buffer_hi
;
1013 /* Control structure holding the read/write/etc. pointers into the
1014 trace buffer. We need more than one of these to implement a
1015 transaction-like mechanism to garantees that both GDBserver and the
1016 in-process agent can try to change the trace buffer
1019 struct trace_buffer_control
1021 /* Pointer to the first trace frame in the buffer. In the
1022 non-circular case, this is equal to trace_buffer_lo, otherwise it
1023 moves around in the buffer. */
1024 unsigned char *start
;
1026 /* Pointer to the free part of the trace buffer. Note that we clear
1027 several bytes at and after this pointer, so that traceframe
1028 scans/searches terminate properly. */
1029 unsigned char *free
;
1031 /* Pointer to the byte after the end of the free part. Note that
1032 this may be smaller than trace_buffer_free in the circular case,
1033 and means that the free part is in two pieces. Initially it is
1034 equal to trace_buffer_hi, then is generally equivalent to
1035 trace_buffer_start. */
1036 unsigned char *end_free
;
1038 /* Pointer to the wraparound. If not equal to trace_buffer_hi, then
1039 this is the point at which the trace data breaks, and resumes at
1041 unsigned char *wrap
;
1044 /* Same as above, to be used by GDBserver when updating the in-process
1046 struct ipa_trace_buffer_control
1055 /* We have possibly both GDBserver and an inferior thread accessing
1056 the same IPA trace buffer memory. The IPA is the producer (tries
1057 to put new frames in the buffer), while GDBserver occasionally
1058 consumes them, that is, flushes the IPA's buffer into its own
1059 buffer. Both sides need to update the trace buffer control
1060 pointers (current head, tail, etc.). We can't use a global lock to
1061 synchronize the accesses, as otherwise we could deadlock GDBserver
1062 (if the thread holding the lock stops for a signal, say). So
1063 instead of that, we use a transaction scheme where GDBserver writes
1064 always prevail over the IPAs writes, and, we have the IPA detect
1065 the commit failure/overwrite, and retry the whole attempt. This is
1066 mainly implemented by having a global token object that represents
1067 who wrote last to the buffer control structure. We need to freeze
1068 any inferior writing to the buffer while GDBserver touches memory,
1069 so that the inferior can correctly detect that GDBserver had been
1070 there, otherwise, it could mistakingly think its commit was
1071 successful; that's implemented by simply having GDBserver set a
1072 breakpoint the inferior hits if it is the critical region.
1074 There are three cycling trace buffer control structure copies
1075 (buffer head, tail, etc.), with the token object including an index
1076 indicating which is current live copy. The IPA tentatively builds
1077 an updated copy in a non-current control structure, while GDBserver
1078 always clobbers the current version directly. The IPA then tries
1079 to atomically "commit" its version; if GDBserver clobbered the
1080 structure meanwhile, that will fail, and the IPA restarts the
1083 Listing the step in further detail, we have:
1085 In-process agent (producer):
1087 - passes by `about_to_request_buffer_space' breakpoint/lock
1089 - reads current token, extracts current trace buffer control index,
1090 and starts tentatively updating the rightmost one (0->1, 1->2,
1091 2->0). Note that only one inferior thread is executing this code
1092 at any given time, due to an outer lock in the jump pads.
1094 - updates counters, and tries to commit the token.
1096 - passes by second `about_to_request_buffer_space' breakpoint/lock,
1097 leaving the sync region.
1099 - checks if the update was effective.
1101 - if trace buffer was found full, hits flush_trace_buffer
1102 breakpoint, and restarts later afterwards.
1104 GDBserver (consumer):
1106 - sets `about_to_request_buffer_space' breakpoint/lock.
1108 - updates the token unconditionally, using the current buffer
1109 control index, since it knows that the IP agent always writes to
1110 the rightmost, and due to the breakpoint, at most one IP thread
1111 can try to update the trace buffer concurrently to GDBserver, so
1112 there will be no danger of trace buffer control index wrap making
1113 the IPA write to the same index as GDBserver.
1115 - flushes the IP agent's trace buffer completely, and updates the
1116 current trace buffer control structure. GDBserver *always* wins.
1118 - removes the `about_to_request_buffer_space' breakpoint.
1120 The token is stored in the `trace_buffer_ctrl_curr' variable.
1121 Internally, it's bits are defined as:
1123 |-------------+-----+-------------+--------+-------------+--------------|
1124 | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 |
1125 |-------------+-----+-------------+--------+-------------+--------------|
1126 | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) |
1127 |-------------+-----+-------------+--------+-------------+--------------|
1129 GSB - GDBserver Stamp Bit
1130 PC - Previous Counter
1131 CC - Current Counter
1132 TBCI - Trace Buffer Control Index
1135 An IPA update of `trace_buffer_ctrl_curr' does:
1137 - read CC from the current token, save as PC.
1139 - atomically tries to write PC+1,CC
1141 A GDBserver update of `trace_buffer_ctrl_curr' does:
1143 - reads PC and CC from the current token.
1148 /* These are the bits of `trace_buffer_ctrl_curr' that are reserved
1149 for the counters described below. The cleared bits are used to
1150 hold the index of the items of the `trace_buffer_ctrl' array that
1152 #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0
1154 /* `trace_buffer_ctrl_curr' contains two counters. The `previous'
1155 counter, and the `current' counter. */
1157 #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000
1158 #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00
1160 /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it
1161 always stamps this bit as set. */
1162 #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000
1164 #ifdef IN_PROCESS_AGENT
1165 IP_AGENT_EXPORT_VAR
struct trace_buffer_control trace_buffer_ctrl
[3];
1166 IP_AGENT_EXPORT_VAR
unsigned int trace_buffer_ctrl_curr
;
1168 # define TRACE_BUFFER_CTRL_CURR \
1169 (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK)
1173 /* The GDBserver side agent only needs one instance of this object, as
1174 it doesn't need to sync with itself. Define it as array anyway so
1175 that the rest of the code base doesn't need to care for the
1177 struct trace_buffer_control trace_buffer_ctrl
[1];
1178 # define TRACE_BUFFER_CTRL_CURR 0
1181 /* These are convenience macros used to access the current trace
1182 buffer control in effect. */
1183 #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start)
1184 #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free)
1185 #define trace_buffer_end_free \
1186 (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free)
1187 #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap)
1190 /* Macro that returns a pointer to the first traceframe in the buffer. */
1192 #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start)
1194 /* Macro that returns a pointer to the next traceframe in the buffer.
1195 If the computed location is beyond the wraparound point, subtract
1196 the offset of the wraparound. */
1198 #define NEXT_TRACEFRAME_1(TF) \
1199 (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size)
1201 #define NEXT_TRACEFRAME(TF) \
1202 ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \
1203 - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \
1204 ? (trace_buffer_wrap - trace_buffer_lo) \
1207 /* The difference between these counters represents the total number
1208 of complete traceframes present in the trace buffer. The IP agent
1209 writes to the write count, GDBserver writes to read count. */
1211 IP_AGENT_EXPORT_VAR
unsigned int traceframe_write_count
;
1212 IP_AGENT_EXPORT_VAR
unsigned int traceframe_read_count
;
1214 /* Convenience macro. */
1216 #define traceframe_count \
1217 ((unsigned int) (traceframe_write_count - traceframe_read_count))
1219 /* The count of all traceframes created in the current run, including
1220 ones that were discarded to make room. */
1222 IP_AGENT_EXPORT_VAR
int traceframes_created
;
1224 #ifndef IN_PROCESS_AGENT
1226 /* Read-only regions are address ranges whose contents don't change,
1227 and so can be read from target memory even while looking at a trace
1228 frame. Without these, disassembly for instance will likely fail,
1229 because the program code is not usually collected into a trace
1230 frame. This data structure does not need to be very complicated or
1231 particularly efficient, it's only going to be used occasionally,
1232 and only by some commands. */
1234 struct readonly_region
1236 /* The bounds of the region. */
1237 CORE_ADDR start
, end
;
1239 /* Link to the next one. */
1240 struct readonly_region
*next
;
1243 /* Linked list of readonly regions. This list stays in effect from
1244 one tstart to the next. */
1246 static struct readonly_region
*readonly_regions
;
1250 /* The global that controls tracing overall. */
1252 IP_AGENT_EXPORT_VAR
int tracing
;
1254 #ifndef IN_PROCESS_AGENT
1256 /* Controls whether tracing should continue after GDB disconnects. */
1258 int disconnected_tracing
;
1260 /* The reason for the last tracing run to have stopped. We initialize
1261 to a distinct string so that GDB can distinguish between "stopped
1262 after running" and "stopped because never run" cases. */
1264 static const char *tracing_stop_reason
= "tnotrun";
1266 static int tracing_stop_tpnum
;
1268 /* 64-bit timestamps for the trace run's start and finish, expressed
1269 in microseconds from the Unix epoch. */
1271 LONGEST tracing_start_time
;
1272 LONGEST tracing_stop_time
;
1274 /* The (optional) user-supplied name of the user that started the run.
1275 This is an arbitrary string, and may be NULL. */
1277 char *tracing_user_name
;
1279 /* Optional user-supplied text describing the run. This is
1280 an arbitrary string, and may be NULL. */
1282 char *tracing_notes
;
1284 /* Optional user-supplied text explaining a tstop command. This is an
1285 arbitrary string, and may be NULL. */
1287 char *tracing_stop_note
;
1291 /* Functions local to this file. */
1293 /* Base "class" for tracepoint type specific data to be passed down to
1294 collect_data_at_tracepoint. */
1295 struct tracepoint_hit_ctx
1297 enum tracepoint_type type
;
1300 #ifdef IN_PROCESS_AGENT
1302 /* Fast/jump tracepoint specific data to be passed down to
1303 collect_data_at_tracepoint. */
1304 struct fast_tracepoint_ctx
1306 struct tracepoint_hit_ctx base
;
1308 struct regcache regcache
;
1309 int regcache_initted
;
1310 unsigned char *regspace
;
1312 unsigned char *regs
;
1313 struct tracepoint
*tpoint
;
1316 /* Static tracepoint specific data to be passed down to
1317 collect_data_at_tracepoint. */
1318 struct static_tracepoint_ctx
1320 struct tracepoint_hit_ctx base
;
1322 /* The regcache corresponding to the registers state at the time of
1323 the tracepoint hit. Initialized lazily, from REGS. */
1324 struct regcache regcache
;
1325 int regcache_initted
;
1327 /* The buffer space REGCACHE above uses. We use a separate buffer
1328 instead of letting the regcache malloc for both signal safety and
1329 performance reasons; this is allocated on the stack instead. */
1330 unsigned char *regspace
;
1332 /* The register buffer as passed on by lttng/ust. */
1333 struct registers
*regs
;
1335 /* The "printf" formatter and the args the user passed to the marker
1336 call. We use this to be able to collect "static trace data"
1341 /* The GDB tracepoint matching the probed marker that was "hit". */
1342 struct tracepoint
*tpoint
;
1347 /* Static tracepoint specific data to be passed down to
1348 collect_data_at_tracepoint. */
1349 struct trap_tracepoint_ctx
1351 struct tracepoint_hit_ctx base
;
1353 struct regcache
*regcache
;
1358 #ifndef IN_PROCESS_AGENT
1359 static CORE_ADDR
traceframe_get_pc (struct traceframe
*tframe
);
1360 static int traceframe_read_tsv (int num
, LONGEST
*val
);
1363 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1364 struct tracepoint
*tpoint
);
1366 #ifndef IN_PROCESS_AGENT
1367 static void clear_readonly_regions (void);
1368 static void clear_installed_tracepoints (void);
1371 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1373 struct tracepoint
*tpoint
);
1374 #ifndef IN_PROCESS_AGENT
1375 static void collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
1377 struct tracepoint
*tpoint
, int current_step
);
1378 static void compile_tracepoint_condition (struct tracepoint
*tpoint
,
1379 CORE_ADDR
*jump_entry
);
1381 static void do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
1383 struct tracepoint
*tpoint
,
1384 struct traceframe
*tframe
,
1385 struct tracepoint_action
*taction
);
1387 #ifndef IN_PROCESS_AGENT
1388 static struct tracepoint
*fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR
);
1390 static void install_tracepoint (struct tracepoint
*, char *own_buf
);
1391 static void download_tracepoint (struct tracepoint
*);
1392 static int install_fast_tracepoint (struct tracepoint
*, char *errbuf
);
1393 static void clone_fast_tracepoint (struct tracepoint
*to
,
1394 const struct tracepoint
*from
);
1397 static LONGEST
get_timestamp (void);
1399 #if defined(__GNUC__)
1400 # define memory_barrier() asm volatile ("" : : : "memory")
1402 # define memory_barrier() do {} while (0)
1405 /* We only build the IPA if this builtin is supported, and there are
1406 no uses of this in GDBserver itself, so we're safe in defining this
1408 #define cmpxchg(mem, oldval, newval) \
1409 __sync_val_compare_and_swap (mem, oldval, newval)
1411 /* Record that an error occurred during expression evaluation. */
1414 record_tracepoint_error (struct tracepoint
*tpoint
, const char *which
,
1415 enum eval_result_type rtype
)
1417 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1418 tpoint
->number
, paddress (tpoint
->address
), which
, rtype
);
1420 #ifdef IN_PROCESS_AGENT
1421 /* Only record the first error we get. */
1422 if (cmpxchg (&expr_eval_result
,
1424 rtype
) != expr_eval_no_error
)
1427 if (expr_eval_result
!= expr_eval_no_error
)
1431 error_tracepoint
= tpoint
;
1434 /* Trace buffer management. */
1437 clear_trace_buffer (void)
1439 trace_buffer_start
= trace_buffer_lo
;
1440 trace_buffer_free
= trace_buffer_lo
;
1441 trace_buffer_end_free
= trace_buffer_hi
;
1442 trace_buffer_wrap
= trace_buffer_hi
;
1443 /* A traceframe with zeroed fields marks the end of trace data. */
1444 ((struct traceframe
*) trace_buffer_free
)->tpnum
= 0;
1445 ((struct traceframe
*) trace_buffer_free
)->data_size
= 0;
1446 traceframe_read_count
= traceframe_write_count
= 0;
1447 traceframes_created
= 0;
1450 #ifndef IN_PROCESS_AGENT
1453 clear_inferior_trace_buffer (void)
1455 CORE_ADDR ipa_trace_buffer_lo
;
1456 CORE_ADDR ipa_trace_buffer_hi
;
1457 struct traceframe ipa_traceframe
= { 0 };
1458 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
1460 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
1461 &ipa_trace_buffer_lo
);
1462 read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
1463 &ipa_trace_buffer_hi
);
1465 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
1466 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
1467 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
1468 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
1470 /* A traceframe with zeroed fields marks the end of trace data. */
1471 write_inferior_memory (ipa_sym_addrs
.addr_trace_buffer_ctrl
,
1472 (unsigned char *) &ipa_trace_buffer_ctrl
,
1473 sizeof (ipa_trace_buffer_ctrl
));
1475 write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
, 0);
1477 /* A traceframe with zeroed fields marks the end of trace data. */
1478 write_inferior_memory (ipa_trace_buffer_lo
,
1479 (unsigned char *) &ipa_traceframe
,
1480 sizeof (ipa_traceframe
));
1482 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
, 0);
1483 write_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
, 0);
1484 write_inferior_integer (ipa_sym_addrs
.addr_traceframes_created
, 0);
1490 init_trace_buffer (LONGEST bufsize
)
1494 trace_buffer_size
= bufsize
;
1496 /* Make sure to internally allocate at least space for the EOB
1498 alloc_size
= (bufsize
< TRACEFRAME_EOB_MARKER_SIZE
1499 ? TRACEFRAME_EOB_MARKER_SIZE
: bufsize
);
1500 trace_buffer_lo
= xrealloc (trace_buffer_lo
, alloc_size
);
1502 trace_buffer_hi
= trace_buffer_lo
+ trace_buffer_size
;
1504 clear_trace_buffer ();
1507 #ifdef IN_PROCESS_AGENT
1509 IP_AGENT_EXPORT_FUNC
void
1510 about_to_request_buffer_space (void)
1512 /* GDBserver places breakpoint here while it goes about to flush
1513 data at random times. */
1514 UNKNOWN_SIDE_EFFECTS();
1519 /* Carve out a piece of the trace buffer, returning NULL in case of
1523 trace_buffer_alloc (size_t amt
)
1525 unsigned char *rslt
;
1526 struct trace_buffer_control
*tbctrl
;
1528 #ifdef IN_PROCESS_AGENT
1529 unsigned int prev
, prev_filtered
;
1530 unsigned int commit_count
;
1531 unsigned int commit
;
1532 unsigned int readout
;
1534 struct traceframe
*oldest
;
1535 unsigned char *new_start
;
1538 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1539 (long) amt
, (long) sizeof (struct traceframe
));
1541 /* Account for the EOB marker. */
1542 amt
+= TRACEFRAME_EOB_MARKER_SIZE
;
1544 #ifdef IN_PROCESS_AGENT
1548 /* Read the current token and extract the index to try to write to,
1549 storing it in CURR. */
1550 prev
= trace_buffer_ctrl_curr
;
1551 prev_filtered
= prev
& ~GDBSERVER_FLUSH_COUNT_MASK
;
1552 curr
= prev_filtered
+ 1;
1556 about_to_request_buffer_space ();
1558 /* Start out with a copy of the current state. GDBserver may be
1559 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1560 be able to commit anyway if that happens. */
1561 trace_buffer_ctrl
[curr
]
1562 = trace_buffer_ctrl
[prev_filtered
];
1563 trace_debug ("trying curr=%u", curr
);
1565 /* The GDBserver's agent doesn't need all that syncing, and always
1566 updates TCB 0 (there's only one, mind you). */
1569 tbctrl
= &trace_buffer_ctrl
[curr
];
1571 /* Offsets are easier to grok for debugging than raw addresses,
1572 especially for the small trace buffer sizes that are useful for
1574 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1576 (int) (tbctrl
->start
- trace_buffer_lo
),
1577 (int) (tbctrl
->free
- trace_buffer_lo
),
1578 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1579 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1580 (int) (trace_buffer_hi
- trace_buffer_lo
));
1582 /* The algorithm here is to keep trying to get a contiguous block of
1583 the requested size, possibly discarding older traceframes to free
1584 up space. Since free space might come in one or two pieces,
1585 depending on whether discarded traceframes wrapped around at the
1586 high end of the buffer, we test both pieces after each
1590 /* First, if we have two free parts, try the upper one first. */
1591 if (tbctrl
->end_free
< tbctrl
->free
)
1593 if (tbctrl
->free
+ amt
<= trace_buffer_hi
)
1594 /* We have enough in the upper part. */
1598 /* Our high part of free space wasn't enough. Give up
1599 on it for now, set wraparound. We will recover the
1600 space later, if/when the wrapped-around traceframe is
1602 trace_debug ("Upper part too small, setting wraparound");
1603 tbctrl
->wrap
= tbctrl
->free
;
1604 tbctrl
->free
= trace_buffer_lo
;
1608 /* The normal case. */
1609 if (tbctrl
->free
+ amt
<= tbctrl
->end_free
)
1612 #ifdef IN_PROCESS_AGENT
1613 /* The IP Agent's buffer is always circular. It isn't used
1614 currently, but `circular_trace_buffer' could represent
1615 GDBserver's mode. If we didn't find space, ask GDBserver to
1618 flush_trace_buffer ();
1622 trace_debug ("gdbserver flushed buffer, retrying");
1626 /* GDBserver cancelled the tracing. Bail out as well. */
1629 /* If we're here, then neither part is big enough, and
1630 non-circular trace buffers are now full. */
1631 if (!circular_trace_buffer
)
1633 trace_debug ("Not enough space in the trace buffer");
1637 trace_debug ("Need more space in the trace buffer");
1639 /* If we have a circular buffer, we can try discarding the
1640 oldest traceframe and see if that helps. */
1641 oldest
= FIRST_TRACEFRAME ();
1642 if (oldest
->tpnum
== 0)
1644 /* Not good; we have no traceframes to free. Perhaps we're
1645 asking for a block that is larger than the buffer? In
1646 any case, give up. */
1647 trace_debug ("No traceframes to discard");
1651 /* We don't run this code in the in-process agent currently.
1652 E.g., we could leave the in-process agent in autonomous
1653 circular mode if we only have fast tracepoints. If we do
1654 that, then this bit becomes racy with GDBserver, which also
1655 writes to this counter. */
1656 --traceframe_write_count
;
1658 new_start
= (unsigned char *) NEXT_TRACEFRAME (oldest
);
1659 /* If we freed the traceframe that wrapped around, go back
1660 to the non-wrap case. */
1661 if (new_start
< tbctrl
->start
)
1663 trace_debug ("Discarding past the wraparound");
1664 tbctrl
->wrap
= trace_buffer_hi
;
1666 tbctrl
->start
= new_start
;
1667 tbctrl
->end_free
= tbctrl
->start
;
1669 trace_debug ("Discarded a traceframe\n"
1670 "Trace buffer [%d], start=%d free=%d "
1671 "endfree=%d wrap=%d hi=%d",
1673 (int) (tbctrl
->start
- trace_buffer_lo
),
1674 (int) (tbctrl
->free
- trace_buffer_lo
),
1675 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1676 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1677 (int) (trace_buffer_hi
- trace_buffer_lo
));
1679 /* Now go back around the loop. The discard might have resulted
1680 in either one or two pieces of free space, so we want to try
1681 both before freeing any more traceframes. */
1685 /* If we get here, we know we can provide the asked-for space. */
1687 rslt
= tbctrl
->free
;
1689 /* Adjust the request back down, now that we know we have space for
1690 the marker, but don't commit to AMT yet, we may still need to
1691 restart the operation if GDBserver touches the trace buffer
1692 (obviously only important in the in-process agent's version). */
1693 tbctrl
->free
+= (amt
- sizeof (struct traceframe
));
1695 /* Or not. If GDBserver changed the trace buffer behind our back,
1696 we get to restart a new allocation attempt. */
1698 #ifdef IN_PROCESS_AGENT
1699 /* Build the tentative token. */
1700 commit_count
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) + 0x100)
1701 & GDBSERVER_FLUSH_COUNT_MASK_CURR
);
1702 commit
= (((prev
& GDBSERVER_FLUSH_COUNT_MASK_CURR
) << 12)
1706 /* Try to commit it. */
1707 readout
= cmpxchg (&trace_buffer_ctrl_curr
, prev
, commit
);
1708 if (readout
!= prev
)
1710 trace_debug ("GDBserver has touched the trace buffer, restarting."
1711 " (prev=%08x, commit=%08x, readout=%08x)",
1712 prev
, commit
, readout
);
1716 /* Hold your horses here. Even if that change was committed,
1717 GDBserver could come in, and clobber it. We need to hold to be
1718 able to tell if GDBserver clobbers before or after we committed
1719 the change. Whenever GDBserver goes about touching the IPA
1720 buffer, it sets a breakpoint in this routine, so we have a sync
1722 about_to_request_buffer_space ();
1724 /* Check if the change has been effective, even if GDBserver stopped
1725 us at the breakpoint. */
1728 unsigned int refetch
;
1732 refetch
= trace_buffer_ctrl_curr
;
1734 if (refetch
== commit
1735 || ((refetch
& GDBSERVER_FLUSH_COUNT_MASK_PREV
) >> 12) == commit_count
)
1738 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1739 "readout=%08x, refetch=%08x)",
1740 prev
, commit
, readout
, refetch
);
1744 trace_debug ("GDBserver has touched the trace buffer, not effective."
1745 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1746 prev
, commit
, readout
, refetch
);
1752 /* We have a new piece of the trace buffer. Hurray! */
1754 /* Add an EOB marker just past this allocation. */
1755 ((struct traceframe
*) tbctrl
->free
)->tpnum
= 0;
1756 ((struct traceframe
*) tbctrl
->free
)->data_size
= 0;
1758 /* Adjust the request back down, now that we know we have space for
1760 amt
-= sizeof (struct traceframe
);
1764 trace_debug ("Allocated %d bytes", (int) amt
);
1765 trace_debug ("Trace buffer [%d] start=%d free=%d "
1766 "endfree=%d wrap=%d hi=%d",
1768 (int) (tbctrl
->start
- trace_buffer_lo
),
1769 (int) (tbctrl
->free
- trace_buffer_lo
),
1770 (int) (tbctrl
->end_free
- trace_buffer_lo
),
1771 (int) (tbctrl
->wrap
- trace_buffer_lo
),
1772 (int) (trace_buffer_hi
- trace_buffer_lo
));
1778 #ifndef IN_PROCESS_AGENT
1780 /* Return the total free space. This is not necessarily the largest
1781 block we can allocate, because of the two-part case. */
1786 if (trace_buffer_free
<= trace_buffer_end_free
)
1787 return trace_buffer_end_free
- trace_buffer_free
;
1789 return ((trace_buffer_end_free
- trace_buffer_lo
)
1790 + (trace_buffer_hi
- trace_buffer_free
));
1793 /* An 'S' in continuation packets indicates remainder are for
1796 static int seen_step_action_flag
;
1798 /* Create a tracepoint (location) with given number and address. Add this
1799 new tracepoint to list and sort this list. */
1801 static struct tracepoint
*
1802 add_tracepoint (int num
, CORE_ADDR addr
)
1804 struct tracepoint
*tpoint
, **tp_next
;
1806 tpoint
= xmalloc (sizeof (struct tracepoint
));
1807 tpoint
->number
= num
;
1808 tpoint
->address
= addr
;
1809 tpoint
->numactions
= 0;
1810 tpoint
->actions
= NULL
;
1811 tpoint
->actions_str
= NULL
;
1812 tpoint
->cond
= NULL
;
1813 tpoint
->num_step_actions
= 0;
1814 tpoint
->step_actions
= NULL
;
1815 tpoint
->step_actions_str
= NULL
;
1816 /* Start all off as regular (slow) tracepoints. */
1817 tpoint
->type
= trap_tracepoint
;
1818 tpoint
->orig_size
= -1;
1819 tpoint
->source_strings
= NULL
;
1820 tpoint
->compiled_cond
= 0;
1821 tpoint
->handle
= NULL
;
1822 tpoint
->next
= NULL
;
1824 /* Find a place to insert this tracepoint into list in order to keep
1825 the tracepoint list still in the ascending order. There may be
1826 multiple tracepoints at the same address as TPOINT's, and this
1827 guarantees TPOINT is inserted after all the tracepoints which are
1828 set at the same address. For example, fast tracepoints A, B, C are
1829 set at the same address, and D is to be insert at the same place as
1832 -->| A |--> | B |-->| C |->...
1834 One jump pad was created for tracepoint A, B, and C, and the target
1835 address of A is referenced/used in jump pad. So jump pad will let
1836 inferior jump to A. If D is inserted in front of A, like this,
1838 -->| D |-->| A |--> | B |-->| C |->...
1840 without updating jump pad, D is not reachable during collect, which
1841 is wrong. As we can see, the order of B, C and D doesn't matter, but
1842 A should always be the `first' one. */
1843 for (tp_next
= &tracepoints
;
1844 (*tp_next
) != NULL
&& (*tp_next
)->address
<= tpoint
->address
;
1845 tp_next
= &(*tp_next
)->next
)
1847 tpoint
->next
= *tp_next
;
1849 last_tracepoint
= tpoint
;
1851 seen_step_action_flag
= 0;
1856 #ifndef IN_PROCESS_AGENT
1858 /* Return the tracepoint with the given number and address, or NULL. */
1860 static struct tracepoint
*
1861 find_tracepoint (int id
, CORE_ADDR addr
)
1863 struct tracepoint
*tpoint
;
1865 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
1866 if (tpoint
->number
== id
&& tpoint
->address
== addr
)
1872 /* Remove TPOINT from global list. */
1875 remove_tracepoint (struct tracepoint
*tpoint
)
1877 struct tracepoint
*tp
, *tp_prev
;
1879 for (tp
= tracepoints
, tp_prev
= NULL
; tp
&& tp
!= tpoint
;
1880 tp_prev
= tp
, tp
= tp
->next
)
1886 tp_prev
->next
= tp
->next
;
1888 tracepoints
= tp
->next
;
1894 /* There may be several tracepoints with the same number (because they
1895 are "locations", in GDB parlance); return the next one after the
1896 given tracepoint, or search from the beginning of the list if the
1897 first argument is NULL. */
1899 static struct tracepoint
*
1900 find_next_tracepoint_by_number (struct tracepoint
*prev_tp
, int num
)
1902 struct tracepoint
*tpoint
;
1905 tpoint
= prev_tp
->next
;
1907 tpoint
= tracepoints
;
1908 for (; tpoint
; tpoint
= tpoint
->next
)
1909 if (tpoint
->number
== num
)
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 = savestring (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 = savestring (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_FUNC 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_FUNC
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
,
2220 struct tracepoint
*tpoint
, int amt
)
2222 unsigned char *block
;
2227 block
= trace_buffer_alloc (amt
);
2232 gdb_assert (tframe
->tpnum
== tpoint
->number
);
2234 tframe
->data_size
+= amt
;
2235 tpoint
->traceframe_usage
+= amt
;
2240 /* Flag that the current traceframe is finished. */
2243 finish_traceframe (struct traceframe
*tframe
)
2245 ++traceframe_write_count
;
2246 ++traceframes_created
;
2249 #ifndef IN_PROCESS_AGENT
2251 /* Given a traceframe number NUM, find the NUMth traceframe in the
2254 static struct traceframe
*
2255 find_traceframe (int num
)
2257 struct traceframe
*tframe
;
2260 for (tframe
= FIRST_TRACEFRAME ();
2262 tframe
= NEXT_TRACEFRAME (tframe
))
2273 get_traceframe_address (struct traceframe
*tframe
)
2276 struct tracepoint
*tpoint
;
2278 addr
= traceframe_get_pc (tframe
);
2283 /* Fallback strategy, will be incorrect for while-stepping frames
2284 and multi-location tracepoints. */
2285 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2286 return tpoint
->address
;
2289 /* Search for the next traceframe whose address is inside or outside
2292 static struct traceframe
*
2293 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2296 struct traceframe
*tframe
;
2299 *tfnump
= current_traceframe
+ 1;
2300 tframe
= find_traceframe (*tfnump
);
2301 /* The search is not supposed to wrap around. */
2308 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2310 tfaddr
= get_traceframe_address (tframe
);
2312 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2313 : (lo
> tfaddr
|| tfaddr
> hi
))
2322 /* Search for the next traceframe recorded by the given tracepoint.
2323 Note that for multi-location tracepoints, this will find whatever
2324 location appears first. */
2326 static struct traceframe
*
2327 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2329 struct traceframe
*tframe
;
2331 *tfnump
= current_traceframe
+ 1;
2332 tframe
= find_traceframe (*tfnump
);
2333 /* The search is not supposed to wrap around. */
2340 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2342 if (tframe
->tpnum
== num
)
2353 #ifndef IN_PROCESS_AGENT
2355 /* Clear all past trace state. */
2358 cmd_qtinit (char *packet
)
2360 struct trace_state_variable
*tsv
, *prev
, *next
;
2362 /* Can't do this command without a pid attached. */
2363 if (current_thread
== NULL
)
2369 /* Make sure we don't try to read from a trace frame. */
2370 current_traceframe
= -1;
2374 trace_debug ("Initializing the trace");
2376 clear_installed_tracepoints ();
2377 clear_readonly_regions ();
2380 last_tracepoint
= NULL
;
2382 /* Clear out any leftover trace state variables. Ones with target
2383 defined getters should be kept however. */
2385 tsv
= trace_state_variables
;
2388 trace_debug ("Looking at var %d", tsv
->number
);
2389 if (tsv
->getter
== NULL
)
2395 trace_state_variables
= next
;
2396 trace_debug ("Deleting var %d", tsv
->number
);
2407 clear_trace_buffer ();
2408 clear_inferior_trace_buffer ();
2413 /* Unprobe the UST marker at ADDRESS. */
2416 unprobe_marker_at (CORE_ADDR address
)
2418 char cmd
[IPA_CMD_BUF_SIZE
];
2420 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2421 run_inferior_command (cmd
, strlen (cmd
) + 1);
2424 /* Restore the program to its pre-tracing state. This routine may be called
2425 in error situations, so it needs to be careful about only restoring
2426 from known-valid bits. */
2429 clear_installed_tracepoints (void)
2431 struct tracepoint
*tpoint
;
2432 struct tracepoint
*prev_stpoint
;
2436 prev_stpoint
= NULL
;
2438 /* Restore any bytes overwritten by tracepoints. */
2439 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2441 /* Catch the case where we might try to remove a tracepoint that
2442 was never actually installed. */
2443 if (tpoint
->handle
== NULL
)
2445 trace_debug ("Tracepoint %d at 0x%s was "
2446 "never installed, nothing to clear",
2447 tpoint
->number
, paddress (tpoint
->address
));
2451 switch (tpoint
->type
)
2453 case trap_tracepoint
:
2454 delete_breakpoint (tpoint
->handle
);
2456 case fast_tracepoint
:
2457 delete_fast_tracepoint_jump (tpoint
->handle
);
2459 case static_tracepoint
:
2460 if (prev_stpoint
!= NULL
2461 && prev_stpoint
->address
== tpoint
->address
)
2462 /* Nothing to do. We already unprobed a tracepoint set at
2463 this marker address (and there can only be one probe
2468 unprobe_marker_at (tpoint
->address
);
2469 prev_stpoint
= tpoint
;
2474 tpoint
->handle
= NULL
;
2480 /* Parse a packet that defines a tracepoint. */
2483 cmd_qtdp (char *own_buf
)
2486 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2487 int trail_hyphen
= 0;
2491 struct tracepoint
*tpoint
;
2493 char *packet
= own_buf
;
2495 packet
+= strlen ("QTDP:");
2497 /* A hyphen at the beginning marks a packet specifying actions for a
2498 tracepoint already supplied. */
2505 packet
= unpack_varlen_hex (packet
, &num
);
2506 ++packet
; /* skip a colon */
2507 packet
= unpack_varlen_hex (packet
, &addr
);
2508 ++packet
; /* skip a colon */
2510 /* See if we already have this tracepoint. */
2511 tpoint
= find_tracepoint (num
, addr
);
2515 /* Duplicate tracepoints are never allowed. */
2518 trace_debug ("Tracepoint error: tracepoint %d"
2519 " at 0x%s already exists",
2520 (int) num
, paddress (addr
));
2521 write_enn (own_buf
);
2525 tpoint
= add_tracepoint (num
, addr
);
2527 tpoint
->enabled
= (*packet
== 'E');
2528 ++packet
; /* skip 'E' */
2529 ++packet
; /* skip a colon */
2530 packet
= unpack_varlen_hex (packet
, &count
);
2531 tpoint
->step_count
= count
;
2532 ++packet
; /* skip a colon */
2533 packet
= unpack_varlen_hex (packet
, &count
);
2534 tpoint
->pass_count
= count
;
2535 /* See if we have any of the additional optional fields. */
2536 while (*packet
== ':')
2541 tpoint
->type
= fast_tracepoint
;
2543 packet
= unpack_varlen_hex (packet
, &count
);
2544 tpoint
->orig_size
= count
;
2546 else if (*packet
== 'S')
2548 tpoint
->type
= static_tracepoint
;
2551 else if (*packet
== 'X')
2553 actparm
= (char *) packet
;
2554 tpoint
->cond
= gdb_parse_agent_expr (&actparm
);
2557 else if (*packet
== '-')
2559 else if (*packet
== '\0')
2562 trace_debug ("Unknown optional tracepoint field");
2567 trace_debug ("Also has actions\n");
2570 trace_debug ("Defined %stracepoint %d at 0x%s, "
2571 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2572 tpoint
->type
== fast_tracepoint
? "fast "
2573 : tpoint
->type
== static_tracepoint
? "static " : "",
2574 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2575 tpoint
->step_count
, tpoint
->pass_count
);
2578 add_tracepoint_action (tpoint
, packet
);
2581 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2582 (int) num
, paddress (addr
));
2583 write_enn (own_buf
);
2587 /* Install tracepoint during tracing only once for each tracepoint location.
2588 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2589 determine the last QTDP packet for one tracepoint location by checking
2590 trailing hyphen in QTDP packet. */
2591 if (tracing
&& !trail_hyphen
)
2593 struct tracepoint
*tp
= NULL
;
2595 /* Pause all threads temporarily while we patch tracepoints. */
2598 /* download_tracepoint will update global `tracepoints'
2599 list, so it is unsafe to leave threads in jump pad. */
2600 stabilize_threads ();
2602 /* Freeze threads. */
2606 if (tpoint
->type
!= trap_tracepoint
)
2608 /* Find another fast or static tracepoint at the same address. */
2609 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2611 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2612 && tp
->number
!= tpoint
->number
)
2616 /* TPOINT is installed at the same address as TP. */
2619 if (tpoint
->type
== fast_tracepoint
)
2620 clone_fast_tracepoint (tpoint
, tp
);
2621 else if (tpoint
->type
== static_tracepoint
)
2622 tpoint
->handle
= (void *) -1;
2626 if (use_agent
&& tpoint
->type
== fast_tracepoint
2627 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2629 /* Download and install fast tracepoint by agent. */
2630 if (tracepoint_send_agent (tpoint
) == 0)
2634 write_enn (own_buf
);
2635 remove_tracepoint (tpoint
);
2640 download_tracepoint (tpoint
);
2642 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2644 install_tracepoint (tpoint
, own_buf
);
2645 if (strcmp (own_buf
, "OK") != 0)
2646 remove_tracepoint (tpoint
);
2660 cmd_qtdpsrc (char *own_buf
)
2662 ULONGEST num
, addr
, start
, slen
;
2663 struct tracepoint
*tpoint
;
2664 char *packet
= own_buf
;
2665 char *saved
, *srctype
, *src
;
2667 struct source_string
*last
, *newlast
;
2669 packet
+= strlen ("QTDPsrc:");
2671 packet
= unpack_varlen_hex (packet
, &num
);
2672 ++packet
; /* skip a colon */
2673 packet
= unpack_varlen_hex (packet
, &addr
);
2674 ++packet
; /* skip a colon */
2676 /* See if we already have this tracepoint. */
2677 tpoint
= find_tracepoint (num
, addr
);
2681 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2682 (int) num
, paddress (addr
));
2683 write_enn (own_buf
);
2688 packet
= strchr (packet
, ':');
2689 srctype
= xmalloc (packet
- saved
+ 1);
2690 memcpy (srctype
, saved
, packet
- saved
);
2691 srctype
[packet
- saved
] = '\0';
2693 packet
= unpack_varlen_hex (packet
, &start
);
2694 ++packet
; /* skip a colon */
2695 packet
= unpack_varlen_hex (packet
, &slen
);
2696 ++packet
; /* skip a colon */
2697 src
= xmalloc (slen
+ 1);
2698 nbytes
= hex2bin (packet
, (gdb_byte
*) src
, strlen (packet
) / 2);
2701 newlast
= xmalloc (sizeof (struct source_string
));
2702 newlast
->type
= srctype
;
2704 newlast
->next
= NULL
;
2705 /* Always add a source string to the end of the list;
2706 this keeps sequences of actions/commands in the right
2708 if (tpoint
->source_strings
)
2710 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2712 last
->next
= newlast
;
2715 tpoint
->source_strings
= newlast
;
2721 cmd_qtdv (char *own_buf
)
2723 ULONGEST num
, val
, builtin
;
2726 struct trace_state_variable
*tsv
;
2727 char *packet
= own_buf
;
2729 packet
+= strlen ("QTDV:");
2731 packet
= unpack_varlen_hex (packet
, &num
);
2732 ++packet
; /* skip a colon */
2733 packet
= unpack_varlen_hex (packet
, &val
);
2734 ++packet
; /* skip a colon */
2735 packet
= unpack_varlen_hex (packet
, &builtin
);
2736 ++packet
; /* skip a colon */
2738 nbytes
= strlen (packet
) / 2;
2739 varname
= xmalloc (nbytes
+ 1);
2740 nbytes
= hex2bin (packet
, (gdb_byte
*) varname
, nbytes
);
2741 varname
[nbytes
] = '\0';
2743 tsv
= create_trace_state_variable (num
, 1);
2744 tsv
->initial_value
= (LONGEST
) val
;
2745 tsv
->name
= varname
;
2747 set_trace_state_variable_value (num
, (LONGEST
) val
);
2753 cmd_qtenable_disable (char *own_buf
, int enable
)
2755 char *packet
= own_buf
;
2757 struct tracepoint
*tp
;
2759 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2760 packet
= unpack_varlen_hex (packet
, &num
);
2761 ++packet
; /* skip a colon */
2762 packet
= unpack_varlen_hex (packet
, &addr
);
2764 tp
= find_tracepoint (num
, addr
);
2768 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2770 trace_debug ("Tracepoint %d at 0x%s is already %s",
2771 (int) num
, paddress (addr
),
2772 enable
? "enabled" : "disabled");
2777 trace_debug ("%s tracepoint %d at 0x%s",
2778 enable
? "Enabling" : "Disabling",
2779 (int) num
, paddress (addr
));
2781 tp
->enabled
= enable
;
2783 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2786 int offset
= offsetof (struct tracepoint
, enabled
);
2787 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2789 ret
= prepare_to_access_memory ();
2792 trace_debug ("Failed to temporarily stop inferior threads");
2793 write_enn (own_buf
);
2797 ret
= write_inferior_integer (obj_addr
, enable
);
2798 done_accessing_memory ();
2802 trace_debug ("Cannot write enabled flag into "
2803 "inferior process memory");
2804 write_enn (own_buf
);
2813 trace_debug ("Tracepoint %d at 0x%s not found",
2814 (int) num
, paddress (addr
));
2815 write_enn (own_buf
);
2820 cmd_qtv (char *own_buf
)
2825 char *packet
= own_buf
;
2827 packet
+= strlen ("qTV:");
2828 unpack_varlen_hex (packet
, &num
);
2830 if (current_traceframe
>= 0)
2832 err
= traceframe_read_tsv ((int) num
, &val
);
2835 strcpy (own_buf
, "U");
2839 /* Only make tsv's be undefined before the first trace run. After a
2840 trace run is over, the user might want to see the last value of
2841 the tsv, and it might not be available in a traceframe. */
2842 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2844 strcpy (own_buf
, "U");
2848 val
= get_trace_state_variable_value (num
);
2850 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2853 /* Clear out the list of readonly regions. */
2856 clear_readonly_regions (void)
2858 struct readonly_region
*roreg
;
2860 while (readonly_regions
)
2862 roreg
= readonly_regions
;
2863 readonly_regions
= readonly_regions
->next
;
2868 /* Parse the collection of address ranges whose contents GDB believes
2869 to be unchanging and so can be read directly from target memory
2870 even while looking at a traceframe. */
2873 cmd_qtro (char *own_buf
)
2875 ULONGEST start
, end
;
2876 struct readonly_region
*roreg
;
2877 char *packet
= own_buf
;
2879 trace_debug ("Want to mark readonly regions");
2881 clear_readonly_regions ();
2883 packet
+= strlen ("QTro");
2885 while (*packet
== ':')
2887 ++packet
; /* skip a colon */
2888 packet
= unpack_varlen_hex (packet
, &start
);
2889 ++packet
; /* skip a comma */
2890 packet
= unpack_varlen_hex (packet
, &end
);
2891 roreg
= xmalloc (sizeof (struct readonly_region
));
2892 roreg
->start
= start
;
2894 roreg
->next
= readonly_regions
;
2895 readonly_regions
= roreg
;
2896 trace_debug ("Added readonly region from 0x%s to 0x%s",
2897 paddress (roreg
->start
), paddress (roreg
->end
));
2903 /* Test to see if the given range is in our list of readonly ranges.
2904 We only test for being entirely within a range, GDB is not going to
2905 send a single memory packet that spans multiple regions. */
2908 in_readonly_region (CORE_ADDR addr
, ULONGEST length
)
2910 struct readonly_region
*roreg
;
2912 for (roreg
= readonly_regions
; roreg
; roreg
= roreg
->next
)
2913 if (roreg
->start
<= addr
&& (addr
+ length
- 1) <= roreg
->end
)
2919 /* The maximum size of a jump pad entry. */
2920 static const int max_jump_pad_size
= 0x100;
2922 static CORE_ADDR gdb_jump_pad_head
;
2924 /* Return the address of the next free jump space. */
2927 get_jump_space_head (void)
2929 if (gdb_jump_pad_head
== 0)
2931 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2932 &gdb_jump_pad_head
))
2934 internal_error (__FILE__
, __LINE__
,
2935 "error extracting jump_pad_buffer");
2939 return gdb_jump_pad_head
;
2942 /* Reserve USED bytes from the jump space. */
2945 claim_jump_space (ULONGEST used
)
2947 trace_debug ("claim_jump_space reserves %s bytes at %s",
2948 pulongest (used
), paddress (gdb_jump_pad_head
));
2949 gdb_jump_pad_head
+= used
;
2952 static CORE_ADDR trampoline_buffer_head
= 0;
2953 static CORE_ADDR trampoline_buffer_tail
;
2955 /* Reserve USED bytes from the trampoline buffer and return the
2956 address of the start of the reserved space in TRAMPOLINE. Returns
2957 non-zero if the space is successfully claimed. */
2960 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2962 if (!trampoline_buffer_head
)
2964 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2965 &trampoline_buffer_tail
))
2967 internal_error (__FILE__
, __LINE__
,
2968 "error extracting trampoline_buffer");
2971 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2972 &trampoline_buffer_head
))
2974 internal_error (__FILE__
, __LINE__
,
2975 "error extracting trampoline_buffer_end");
2979 /* Start claiming space from the top of the trampoline space. If
2980 the space is located at the bottom of the virtual address space,
2981 this reduces the possibility that corruption will occur if a null
2982 pointer is used to write to memory. */
2983 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2985 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2990 trampoline_buffer_head
-= used
;
2992 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2993 pulongest (used
), paddress (trampoline_buffer_head
));
2995 *trampoline
= trampoline_buffer_head
;
2999 /* Returns non-zero if there is space allocated for use in trampolines
3000 for fast tracepoints. */
3003 have_fast_tracepoint_trampoline_buffer (char *buf
)
3005 CORE_ADDR trampoline_end
, errbuf
;
3007 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
3010 internal_error (__FILE__
, __LINE__
,
3011 "error extracting trampoline_buffer_end");
3017 strcpy (buf
, "was claiming");
3018 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3021 internal_error (__FILE__
, __LINE__
,
3022 "error extracting errbuf");
3025 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3028 return trampoline_end
!= 0;
3031 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3032 the command fails, or 0 otherwise. If the command ran
3033 successfully, but probing the marker failed, ERROUT will be filled
3034 with the error to reply to GDB, and -1 is also returned. This
3035 allows directly passing IPA errors to GDB. */
3038 probe_marker_at (CORE_ADDR address
, char *errout
)
3040 char cmd
[IPA_CMD_BUF_SIZE
];
3043 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3044 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3050 strcpy (errout
, cmd
);
3059 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3061 to
->jump_pad
= from
->jump_pad
;
3062 to
->jump_pad_end
= from
->jump_pad_end
;
3063 to
->trampoline
= from
->trampoline
;
3064 to
->trampoline_end
= from
->trampoline_end
;
3065 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3066 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3067 to
->handle
= from
->handle
;
3069 gdb_assert (from
->handle
);
3070 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3073 #define MAX_JUMP_SIZE 20
3075 /* Install fast tracepoint. Return 0 if successful, otherwise return
3079 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3081 CORE_ADDR jentry
, jump_entry
;
3082 CORE_ADDR trampoline
;
3083 ULONGEST trampoline_size
;
3085 /* The jump to the jump pad of the last fast tracepoint
3087 unsigned char fjump
[MAX_JUMP_SIZE
];
3088 ULONGEST fjump_size
;
3090 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3092 trace_debug ("Requested a fast tracepoint on an instruction "
3093 "that is of less than the minimum length.");
3097 jentry
= jump_entry
= get_jump_space_head ();
3100 trampoline_size
= 0;
3102 /* Install the jump pad. */
3103 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3105 ipa_sym_addrs
.addr_gdb_collect
,
3106 ipa_sym_addrs
.addr_collecting
,
3109 &trampoline
, &trampoline_size
,
3111 &tpoint
->adjusted_insn_addr
,
3112 &tpoint
->adjusted_insn_addr_end
,
3119 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3122 if (tpoint
->handle
!= NULL
)
3124 tpoint
->jump_pad
= jump_entry
;
3125 tpoint
->jump_pad_end
= jentry
;
3126 tpoint
->trampoline
= trampoline
;
3127 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3129 /* Pad to 8-byte alignment. */
3130 jentry
= ((jentry
+ 7) & ~0x7);
3131 claim_jump_space (jentry
- jump_entry
);
3138 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3141 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3143 tpoint
->handle
= NULL
;
3146 if (tpoint
->type
== trap_tracepoint
)
3148 /* Tracepoints are installed as memory breakpoints. Just go
3149 ahead and install the trap. The breakpoints module
3150 handles duplicated breakpoints, and the memory read
3151 routine handles un-patching traps from memory reads. */
3152 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3153 tracepoint_handler
);
3155 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3157 if (!agent_loaded_p ())
3159 trace_debug ("Requested a %s tracepoint, but fast "
3160 "tracepoints aren't supported.",
3161 tpoint
->type
== static_tracepoint
? "static" : "fast");
3162 write_e_ipa_not_loaded (own_buf
);
3165 if (tpoint
->type
== static_tracepoint
3166 && !in_process_agent_supports_ust ())
3168 trace_debug ("Requested a static tracepoint, but static "
3169 "tracepoints are not supported.");
3170 write_e_ust_not_loaded (own_buf
);
3174 if (tpoint
->type
== fast_tracepoint
)
3175 install_fast_tracepoint (tpoint
, own_buf
);
3178 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3179 tpoint
->handle
= (void *) -1;
3184 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3186 if (tpoint
->handle
== NULL
)
3188 if (*own_buf
== '\0')
3189 write_enn (own_buf
);
3195 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3198 cmd_qtstart (char *packet
)
3200 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3201 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3203 trace_debug ("Starting the trace");
3205 /* Pause all threads temporarily while we patch tracepoints. */
3208 /* Get threads out of jump pads. Safe to do here, since this is a
3209 top level command. And, required to do here, since we're
3210 deleting/rewriting jump pads. */
3212 stabilize_threads ();
3214 /* Freeze threads. */
3217 /* Sync the fast tracepoints list in the inferior ftlib. */
3218 if (agent_loaded_p ())
3219 download_trace_state_variables ();
3221 /* No previous fast tpoint yet. */
3222 prev_ftpoint
= NULL
;
3224 /* No previous static tpoint yet. */
3225 prev_stpoint
= NULL
;
3229 /* Start out empty. */
3230 if (agent_loaded_p ())
3231 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, 0);
3233 /* Download and install tracepoints. */
3234 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3236 /* Ensure all the hit counts start at zero. */
3237 tpoint
->hit_count
= 0;
3238 tpoint
->traceframe_usage
= 0;
3240 if (tpoint
->type
== trap_tracepoint
)
3242 /* Tracepoints are installed as memory breakpoints. Just go
3243 ahead and install the trap. The breakpoints module
3244 handles duplicated breakpoints, and the memory read
3245 routine handles un-patching traps from memory reads. */
3246 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3247 tracepoint_handler
);
3249 else if (tpoint
->type
== fast_tracepoint
3250 || tpoint
->type
== static_tracepoint
)
3252 if (maybe_write_ipa_not_loaded (packet
))
3254 trace_debug ("Requested a %s tracepoint, but fast "
3255 "tracepoints aren't supported.",
3256 tpoint
->type
== static_tracepoint
3257 ? "static" : "fast");
3261 if (tpoint
->type
== fast_tracepoint
)
3264 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3266 if (prev_ftpoint
!= NULL
3267 && prev_ftpoint
->address
== tpoint
->address
)
3270 tracepoint_send_agent (tpoint
);
3272 download_tracepoint_1 (tpoint
);
3274 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3278 /* Tracepoint is installed successfully? */
3281 /* Download and install fast tracepoint by agent. */
3283 installed
= !tracepoint_send_agent (tpoint
);
3286 download_tracepoint_1 (tpoint
);
3287 installed
= !install_fast_tracepoint (tpoint
, packet
);
3291 prev_ftpoint
= tpoint
;
3296 if (!in_process_agent_supports_ust ())
3298 trace_debug ("Requested a static tracepoint, but static "
3299 "tracepoints are not supported.");
3303 download_tracepoint_1 (tpoint
);
3304 /* Can only probe a given marker once. */
3305 if (prev_stpoint
!= NULL
3306 && prev_stpoint
->address
== tpoint
->address
)
3307 tpoint
->handle
= (void *) -1;
3310 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3312 tpoint
->handle
= (void *) -1;
3314 /* So that we can handle multiple static tracepoints
3315 at the same address easily. */
3316 prev_stpoint
= tpoint
;
3322 tpptr
= tpoint
->obj_addr_on_target
;
3324 if (tpoint
== tracepoints
)
3325 /* First object in list, set the head pointer in the
3327 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3329 write_inferior_data_ptr (prev_tpptr
+ offsetof (struct tracepoint
,
3334 /* Any failure in the inner loop is sufficient cause to give
3336 if (tpoint
->handle
== NULL
)
3340 /* Any error in tracepoint insertion is unacceptable; better to
3341 address the problem now, than end up with a useless or misleading
3345 clear_installed_tracepoints ();
3346 if (*packet
== '\0')
3352 stopping_tracepoint
= NULL
;
3353 trace_buffer_is_full
= 0;
3354 expr_eval_result
= expr_eval_no_error
;
3355 error_tracepoint
= NULL
;
3356 tracing_start_time
= get_timestamp ();
3358 /* Tracing is now active, hits will now start being logged. */
3361 if (agent_loaded_p ())
3363 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3365 internal_error (__FILE__
, __LINE__
,
3366 "Error setting tracing variable in lib");
3369 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3372 internal_error (__FILE__
, __LINE__
,
3373 "Error clearing stopping_tracepoint variable"
3377 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3379 internal_error (__FILE__
, __LINE__
,
3380 "Error clearing trace_buffer_is_full variable"
3384 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3385 stop_tracing_handler
);
3386 if (stop_tracing_bkpt
== NULL
)
3387 error ("Error setting stop_tracing breakpoint");
3389 flush_trace_buffer_bkpt
3390 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3391 flush_trace_buffer_handler
);
3392 if (flush_trace_buffer_bkpt
== NULL
)
3393 error ("Error setting flush_trace_buffer breakpoint");
3401 /* End a tracing run, filling in a stop reason to report back to GDB,
3402 and removing the tracepoints from the code. */
3409 trace_debug ("Tracing is already off, ignoring");
3413 trace_debug ("Stopping the trace");
3415 /* Pause all threads before removing fast jumps from memory,
3416 breakpoints, and touching IPA state variables (inferior memory).
3417 Some thread may hit the internal tracing breakpoints, or be
3418 collecting this moment, but that's ok, we don't release the
3419 tpoint object's memory or the jump pads here (we only do that
3420 when we're sure we can move all threads out of the jump pads).
3421 We can't now, since we may be getting here due to the inferior
3422 agent calling us. */
3425 /* Stop logging. Tracepoints can still be hit, but they will not be
3428 if (agent_loaded_p ())
3430 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3432 internal_error (__FILE__
, __LINE__
,
3433 "Error clearing tracing variable in lib");
3437 tracing_stop_time
= get_timestamp ();
3438 tracing_stop_reason
= "t???";
3439 tracing_stop_tpnum
= 0;
3440 if (stopping_tracepoint
)
3442 trace_debug ("Stopping the trace because "
3443 "tracepoint %d was hit %" PRIu64
" times",
3444 stopping_tracepoint
->number
,
3445 stopping_tracepoint
->pass_count
);
3446 tracing_stop_reason
= "tpasscount";
3447 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3449 else if (trace_buffer_is_full
)
3451 trace_debug ("Stopping the trace because the trace buffer is full");
3452 tracing_stop_reason
= "tfull";
3454 else if (expr_eval_result
!= expr_eval_no_error
)
3456 trace_debug ("Stopping the trace because of an expression eval error");
3457 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3458 tracing_stop_tpnum
= error_tracepoint
->number
;
3460 #ifndef IN_PROCESS_AGENT
3461 else if (!gdb_connected ())
3463 trace_debug ("Stopping the trace because GDB disconnected");
3464 tracing_stop_reason
= "tdisconnected";
3469 trace_debug ("Stopping the trace because of a tstop command");
3470 tracing_stop_reason
= "tstop";
3473 stopping_tracepoint
= NULL
;
3474 error_tracepoint
= NULL
;
3476 /* Clear out the tracepoints. */
3477 clear_installed_tracepoints ();
3479 if (agent_loaded_p ())
3481 /* Pull in fast tracepoint trace frames from the inferior lib
3482 buffer into our buffer, even if our buffer is already full,
3483 because we want to present the full number of created frames
3484 in addition to what fit in the trace buffer. */
3485 upload_fast_traceframes ();
3488 if (stop_tracing_bkpt
!= NULL
)
3490 delete_breakpoint (stop_tracing_bkpt
);
3491 stop_tracing_bkpt
= NULL
;
3494 if (flush_trace_buffer_bkpt
!= NULL
)
3496 delete_breakpoint (flush_trace_buffer_bkpt
);
3497 flush_trace_buffer_bkpt
= NULL
;
3504 stop_tracing_handler (CORE_ADDR addr
)
3506 trace_debug ("lib hit stop_tracing");
3508 /* Don't actually handle it here. When we stop tracing we remove
3509 breakpoints from the inferior, and that is not allowed in a
3510 breakpoint handler (as the caller is walking the breakpoint
3516 flush_trace_buffer_handler (CORE_ADDR addr
)
3518 trace_debug ("lib hit flush_trace_buffer");
3523 cmd_qtstop (char *packet
)
3530 cmd_qtdisconnected (char *own_buf
)
3533 char *packet
= own_buf
;
3535 packet
+= strlen ("QTDisconnected:");
3537 unpack_varlen_hex (packet
, &setting
);
3541 disconnected_tracing
= setting
;
3545 cmd_qtframe (char *own_buf
)
3547 ULONGEST frame
, pc
, lo
, hi
, num
;
3549 struct traceframe
*tframe
;
3550 char *packet
= own_buf
;
3552 packet
+= strlen ("QTFrame:");
3554 if (startswith (packet
, "pc:"))
3556 packet
+= strlen ("pc:");
3557 unpack_varlen_hex (packet
, &pc
);
3558 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3559 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3561 else if (startswith (packet
, "range:"))
3563 packet
+= strlen ("range:");
3564 packet
= unpack_varlen_hex (packet
, &lo
);
3566 unpack_varlen_hex (packet
, &hi
);
3567 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3568 paddress (lo
), paddress (hi
));
3569 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3571 else if (startswith (packet
, "outside:"))
3573 packet
+= strlen ("outside:");
3574 packet
= unpack_varlen_hex (packet
, &lo
);
3576 unpack_varlen_hex (packet
, &hi
);
3577 trace_debug ("Want to find next traceframe "
3578 "outside the range 0x%s to 0x%s",
3579 paddress (lo
), paddress (hi
));
3580 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3582 else if (startswith (packet
, "tdp:"))
3584 packet
+= strlen ("tdp:");
3585 unpack_varlen_hex (packet
, &num
);
3587 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3588 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3592 unpack_varlen_hex (packet
, &frame
);
3593 tfnum
= (int) frame
;
3596 trace_debug ("Want to stop looking at traceframes");
3597 current_traceframe
= -1;
3601 trace_debug ("Want to look at traceframe %d", tfnum
);
3602 tframe
= find_traceframe (tfnum
);
3607 current_traceframe
= tfnum
;
3608 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3611 sprintf (own_buf
, "F-1");
3615 cmd_qtstatus (char *packet
)
3617 char *stop_reason_rsp
= NULL
;
3618 char *buf1
, *buf2
, *buf3
;
3622 /* Translate the plain text of the notes back into hex for
3625 str
= (tracing_user_name
? tracing_user_name
: "");
3626 slen
= strlen (str
);
3627 buf1
= (char *) alloca (slen
* 2 + 1);
3628 bin2hex ((gdb_byte
*) str
, buf1
, slen
);
3630 str
= (tracing_notes
? tracing_notes
: "");
3631 slen
= strlen (str
);
3632 buf2
= (char *) alloca (slen
* 2 + 1);
3633 bin2hex ((gdb_byte
*) str
, buf2
, slen
);
3635 str
= (tracing_stop_note
? tracing_stop_note
: "");
3636 slen
= strlen (str
);
3637 buf3
= (char *) alloca (slen
* 2 + 1);
3638 bin2hex ((gdb_byte
*) str
, buf3
, slen
);
3640 trace_debug ("Returning trace status as %d, stop reason %s",
3641 tracing
, tracing_stop_reason
);
3643 if (agent_loaded_p ())
3647 upload_fast_traceframes ();
3652 stop_reason_rsp
= (char *) tracing_stop_reason
;
3654 /* The user visible error string in terror needs to be hex encoded.
3655 We leave it as plain string in `tracing_stop_reason' to ease
3657 if (startswith (stop_reason_rsp
, "terror:"))
3659 const char *result_name
;
3663 result_name
= stop_reason_rsp
+ strlen ("terror:");
3664 hexstr_len
= strlen (result_name
) * 2;
3665 p
= stop_reason_rsp
= alloca (strlen ("terror:") + hexstr_len
+ 1);
3666 strcpy (p
, "terror:");
3668 bin2hex ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3671 /* If this was a forced stop, include any stop note that was supplied. */
3672 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3674 stop_reason_rsp
= alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3675 strcpy (stop_reason_rsp
, "tstop:");
3676 strcat (stop_reason_rsp
, buf3
);
3682 "tframes:%x;tcreated:%x;"
3683 "tfree:%x;tsize:%s;"
3686 "starttime:%s;stoptime:%s;"
3687 "username:%s;notes:%s:",
3689 stop_reason_rsp
, tracing_stop_tpnum
,
3690 traceframe_count
, traceframes_created
,
3691 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3692 circular_trace_buffer
,
3693 disconnected_tracing
,
3694 phex_nz (tracing_start_time
, sizeof (tracing_start_time
)),
3695 phex_nz (tracing_stop_time
, sizeof (tracing_stop_time
)),
3700 cmd_qtp (char *own_buf
)
3703 struct tracepoint
*tpoint
;
3704 char *packet
= own_buf
;
3706 packet
+= strlen ("qTP:");
3708 packet
= unpack_varlen_hex (packet
, &num
);
3709 ++packet
; /* skip a colon */
3710 packet
= unpack_varlen_hex (packet
, &addr
);
3712 /* See if we already have this tracepoint. */
3713 tpoint
= find_tracepoint (num
, addr
);
3717 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3718 (int) num
, paddress (addr
));
3719 write_enn (own_buf
);
3723 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3724 tpoint
->traceframe_usage
);
3727 /* State variables to help return all the tracepoint bits. */
3728 static struct tracepoint
*cur_tpoint
;
3729 static unsigned int cur_action
;
3730 static unsigned int cur_step_action
;
3731 static struct source_string
*cur_source_string
;
3732 static struct trace_state_variable
*cur_tsv
;
3734 /* Compose a response that is an imitation of the syntax by which the
3735 tracepoint was originally downloaded. */
3738 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3742 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3743 paddress (tpoint
->address
),
3744 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3745 tpoint
->pass_count
);
3746 if (tpoint
->type
== fast_tracepoint
)
3747 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3748 else if (tpoint
->type
== static_tracepoint
)
3749 sprintf (packet
+ strlen (packet
), ":S");
3753 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3754 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3755 tpoint
->cond
->length
, buf
);
3760 /* Compose a response that is an imitation of the syntax by which the
3761 tracepoint action was originally downloaded (with the difference
3762 that due to the way we store the actions, this will output a packet
3763 per action, while GDB could have combined more than one action
3767 response_action (char *packet
, struct tracepoint
*tpoint
,
3768 char *taction
, int step
)
3770 sprintf (packet
, "%c%x:%s:%s",
3771 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3775 /* Compose a response that is an imitation of the syntax by which the
3776 tracepoint source piece was originally downloaded. */
3779 response_source (char *packet
,
3780 struct tracepoint
*tpoint
, struct source_string
*src
)
3785 len
= strlen (src
->str
);
3786 buf
= alloca (len
* 2 + 1);
3787 bin2hex ((gdb_byte
*) src
->str
, buf
, len
);
3789 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3790 tpoint
->number
, paddress (tpoint
->address
),
3791 src
->type
, 0, len
, buf
);
3794 /* Return the first piece of tracepoint definition, and initialize the
3795 state machine that will iterate through all the tracepoint
3799 cmd_qtfp (char *packet
)
3801 trace_debug ("Returning first tracepoint definition piece");
3803 cur_tpoint
= tracepoints
;
3804 cur_action
= cur_step_action
= 0;
3805 cur_source_string
= NULL
;
3808 response_tracepoint (packet
, cur_tpoint
);
3810 strcpy (packet
, "l");
3813 /* Return additional pieces of tracepoint definition. Each action and
3814 stepping action must go into its own packet, because of packet size
3815 limits, and so we use state variables to deliver one piece at a
3819 cmd_qtsp (char *packet
)
3821 trace_debug ("Returning subsequent tracepoint definition piece");
3825 /* This case would normally never occur, but be prepared for
3827 strcpy (packet
, "l");
3829 else if (cur_action
< cur_tpoint
->numactions
)
3831 response_action (packet
, cur_tpoint
,
3832 cur_tpoint
->actions_str
[cur_action
], 0);
3835 else if (cur_step_action
< cur_tpoint
->num_step_actions
)
3837 response_action (packet
, cur_tpoint
,
3838 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3841 else if ((cur_source_string
3842 ? cur_source_string
->next
3843 : cur_tpoint
->source_strings
))
3845 if (cur_source_string
)
3846 cur_source_string
= cur_source_string
->next
;
3848 cur_source_string
= cur_tpoint
->source_strings
;
3849 response_source (packet
, cur_tpoint
, cur_source_string
);
3853 cur_tpoint
= cur_tpoint
->next
;
3854 cur_action
= cur_step_action
= 0;
3855 cur_source_string
= NULL
;
3857 response_tracepoint (packet
, cur_tpoint
);
3859 strcpy (packet
, "l");
3863 /* Compose a response that is an imitation of the syntax by which the
3864 trace state variable was originally downloaded. */
3867 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3869 char *buf
= (char *) "";
3874 namelen
= strlen (tsv
->name
);
3875 buf
= alloca (namelen
* 2 + 1);
3876 bin2hex ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3879 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3880 tsv
->getter
? 1 : 0, buf
);
3883 /* Return the first trace state variable definition, and initialize
3884 the state machine that will iterate through all the tsv bits. */
3887 cmd_qtfv (char *packet
)
3889 trace_debug ("Returning first trace state variable definition");
3891 cur_tsv
= trace_state_variables
;
3894 response_tsv (packet
, cur_tsv
);
3896 strcpy (packet
, "l");
3899 /* Return additional trace state variable definitions. */
3902 cmd_qtsv (char *packet
)
3904 trace_debug ("Returning additional trace state variable definition");
3908 cur_tsv
= cur_tsv
->next
;
3910 response_tsv (packet
, cur_tsv
);
3912 strcpy (packet
, "l");
3915 strcpy (packet
, "l");
3918 /* Return the first static tracepoint marker, and initialize the state
3919 machine that will iterate through all the static tracepoints
3923 cmd_qtfstm (char *packet
)
3925 if (!maybe_write_ipa_ust_not_loaded (packet
))
3926 run_inferior_command (packet
, strlen (packet
) + 1);
3929 /* Return additional static tracepoints markers. */
3932 cmd_qtsstm (char *packet
)
3934 if (!maybe_write_ipa_ust_not_loaded (packet
))
3935 run_inferior_command (packet
, strlen (packet
) + 1);
3938 /* Return the definition of the static tracepoint at a given address.
3939 Result packet is the same as qTsST's. */
3942 cmd_qtstmat (char *packet
)
3944 if (!maybe_write_ipa_ust_not_loaded (packet
))
3945 run_inferior_command (packet
, strlen (packet
) + 1);
3948 /* Helper for gdb_agent_about_to_close.
3949 Return non-zero if thread ENTRY is in the same process in DATA. */
3952 same_process_p (struct inferior_list_entry
*entry
, void *data
)
3956 return ptid_get_pid (entry
->id
) == *pid
;
3959 /* Sent the agent a command to close it. */
3962 gdb_agent_about_to_close (int pid
)
3964 char buf
[IPA_CMD_BUF_SIZE
];
3966 if (!maybe_write_ipa_not_loaded (buf
))
3968 struct thread_info
*saved_thread
;
3970 saved_thread
= current_thread
;
3972 /* Find any thread which belongs to process PID. */
3973 current_thread
= (struct thread_info
*)
3974 find_inferior (&all_threads
, same_process_p
, &pid
);
3976 strcpy (buf
, "close");
3978 run_inferior_command (buf
, strlen (buf
) + 1);
3980 current_thread
= saved_thread
;
3984 /* Return the minimum instruction size needed for fast tracepoints as a
3985 hexadecimal number. */
3988 cmd_qtminftpilen (char *packet
)
3990 if (current_thread
== NULL
)
3992 /* Indicate that the minimum length is currently unknown. */
3993 strcpy (packet
, "0");
3997 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
4000 /* Respond to qTBuffer packet with a block of raw data from the trace
4001 buffer. GDB may ask for a lot, but we are allowed to reply with
4002 only as much as will fit within packet limits or whatever. */
4005 cmd_qtbuffer (char *own_buf
)
4007 ULONGEST offset
, num
, tot
;
4009 char *packet
= own_buf
;
4011 packet
+= strlen ("qTBuffer:");
4013 packet
= unpack_varlen_hex (packet
, &offset
);
4014 ++packet
; /* skip a comma */
4015 unpack_varlen_hex (packet
, &num
);
4017 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
4018 (int) num
, phex_nz (offset
, 0));
4020 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
4022 /* If we're right at the end, reply specially that we're done. */
4025 strcpy (own_buf
, "l");
4029 /* Object to any other out-of-bounds request. */
4032 write_enn (own_buf
);
4036 /* Compute the pointer corresponding to the given offset, accounting
4038 tbp
= trace_buffer_start
+ offset
;
4039 if (tbp
>= trace_buffer_wrap
)
4040 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
4042 /* Trim to the remaining bytes if we're close to the end. */
4043 if (num
> tot
- offset
)
4046 /* Trim to available packet size. */
4047 if (num
>= (PBUFSIZ
- 16) / 2 )
4048 num
= (PBUFSIZ
- 16) / 2;
4050 bin2hex (tbp
, own_buf
, num
);
4054 cmd_bigqtbuffer_circular (char *own_buf
)
4057 char *packet
= own_buf
;
4059 packet
+= strlen ("QTBuffer:circular:");
4061 unpack_varlen_hex (packet
, &val
);
4062 circular_trace_buffer
= val
;
4063 trace_debug ("Trace buffer is now %s",
4064 circular_trace_buffer
? "circular" : "linear");
4069 cmd_bigqtbuffer_size (char *own_buf
)
4073 char *packet
= own_buf
;
4075 /* Can't change the size during a tracing run. */
4078 write_enn (own_buf
);
4082 packet
+= strlen ("QTBuffer:size:");
4084 /* -1 is sent as literal "-1". */
4085 if (strcmp (packet
, "-1") == 0)
4086 sval
= DEFAULT_TRACE_BUFFER_SIZE
;
4089 unpack_varlen_hex (packet
, &val
);
4090 sval
= (LONGEST
) val
;
4093 init_trace_buffer (sval
);
4094 trace_debug ("Trace buffer is now %s bytes",
4095 plongest (trace_buffer_size
));
4100 cmd_qtnotes (char *own_buf
)
4103 char *saved
, *user
, *notes
, *stopnote
;
4104 char *packet
= own_buf
;
4106 packet
+= strlen ("QTNotes:");
4110 if (startswith (packet
, "user:"))
4112 packet
+= strlen ("user:");
4114 packet
= strchr (packet
, ';');
4115 nbytes
= (packet
- saved
) / 2;
4116 user
= xmalloc (nbytes
+ 1);
4117 nbytes
= hex2bin (saved
, (gdb_byte
*) user
, nbytes
);
4118 user
[nbytes
] = '\0';
4119 ++packet
; /* skip the semicolon */
4120 trace_debug ("User is '%s'", user
);
4121 xfree (tracing_user_name
);
4122 tracing_user_name
= user
;
4124 else if (startswith (packet
, "notes:"))
4126 packet
+= strlen ("notes:");
4128 packet
= strchr (packet
, ';');
4129 nbytes
= (packet
- saved
) / 2;
4130 notes
= xmalloc (nbytes
+ 1);
4131 nbytes
= hex2bin (saved
, (gdb_byte
*) notes
, nbytes
);
4132 notes
[nbytes
] = '\0';
4133 ++packet
; /* skip the semicolon */
4134 trace_debug ("Notes is '%s'", notes
);
4135 xfree (tracing_notes
);
4136 tracing_notes
= notes
;
4138 else if (startswith (packet
, "tstop:"))
4140 packet
+= strlen ("tstop:");
4142 packet
= strchr (packet
, ';');
4143 nbytes
= (packet
- saved
) / 2;
4144 stopnote
= xmalloc (nbytes
+ 1);
4145 nbytes
= hex2bin (saved
, (gdb_byte
*) stopnote
, nbytes
);
4146 stopnote
[nbytes
] = '\0';
4147 ++packet
; /* skip the semicolon */
4148 trace_debug ("tstop note is '%s'", stopnote
);
4149 xfree (tracing_stop_note
);
4150 tracing_stop_note
= stopnote
;
4160 handle_tracepoint_general_set (char *packet
)
4162 if (strcmp ("QTinit", packet
) == 0)
4164 cmd_qtinit (packet
);
4167 else if (startswith (packet
, "QTDP:"))
4172 else if (startswith (packet
, "QTDPsrc:"))
4174 cmd_qtdpsrc (packet
);
4177 else if (startswith (packet
, "QTEnable:"))
4179 cmd_qtenable_disable (packet
, 1);
4182 else if (startswith (packet
, "QTDisable:"))
4184 cmd_qtenable_disable (packet
, 0);
4187 else if (startswith (packet
, "QTDV:"))
4192 else if (startswith (packet
, "QTro:"))
4197 else if (strcmp ("QTStart", packet
) == 0)
4199 cmd_qtstart (packet
);
4202 else if (strcmp ("QTStop", packet
) == 0)
4204 cmd_qtstop (packet
);
4207 else if (startswith (packet
, "QTDisconnected:"))
4209 cmd_qtdisconnected (packet
);
4212 else if (startswith (packet
, "QTFrame:"))
4214 cmd_qtframe (packet
);
4217 else if (startswith (packet
, "QTBuffer:circular:"))
4219 cmd_bigqtbuffer_circular (packet
);
4222 else if (startswith (packet
, "QTBuffer:size:"))
4224 cmd_bigqtbuffer_size (packet
);
4227 else if (startswith (packet
, "QTNotes:"))
4229 cmd_qtnotes (packet
);
4237 handle_tracepoint_query (char *packet
)
4239 if (strcmp ("qTStatus", packet
) == 0)
4241 cmd_qtstatus (packet
);
4244 else if (startswith (packet
, "qTP:"))
4249 else if (strcmp ("qTfP", packet
) == 0)
4254 else if (strcmp ("qTsP", packet
) == 0)
4259 else if (strcmp ("qTfV", packet
) == 0)
4264 else if (strcmp ("qTsV", packet
) == 0)
4269 else if (startswith (packet
, "qTV:"))
4274 else if (startswith (packet
, "qTBuffer:"))
4276 cmd_qtbuffer (packet
);
4279 else if (strcmp ("qTfSTM", packet
) == 0)
4281 cmd_qtfstm (packet
);
4284 else if (strcmp ("qTsSTM", packet
) == 0)
4286 cmd_qtsstm (packet
);
4289 else if (startswith (packet
, "qTSTMat:"))
4291 cmd_qtstmat (packet
);
4294 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4296 cmd_qtminftpilen (packet
);
4304 #ifndef IN_PROCESS_AGENT
4306 /* Call this when thread TINFO has hit the tracepoint defined by
4307 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4308 action. This adds a while-stepping collecting state item to the
4309 threads' collecting state list, so that we can keep track of
4310 multiple simultaneous while-stepping actions being collected by the
4311 same thread. This can happen in cases like:
4313 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4315 ff0003 INSN3 <-- TP2, collect $regs
4316 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4319 Notice that when instruction INSN5 is reached, the while-stepping
4320 actions of both TP1 and TP3 are still being collected, and that TP2
4321 had been collected meanwhile. The whole range of ff0001-ff0005
4322 should be single-stepped, due to at least TP1's while-stepping
4323 action covering the whole range. */
4326 add_while_stepping_state (struct thread_info
*tinfo
,
4327 int tp_number
, CORE_ADDR tp_address
)
4329 struct wstep_state
*wstep
;
4331 wstep
= xmalloc (sizeof (*wstep
));
4332 wstep
->next
= tinfo
->while_stepping
;
4334 wstep
->tp_number
= tp_number
;
4335 wstep
->tp_address
= tp_address
;
4336 wstep
->current_step
= 0;
4338 tinfo
->while_stepping
= wstep
;
4341 /* Release the while-stepping collecting state WSTEP. */
4344 release_while_stepping_state (struct wstep_state
*wstep
)
4349 /* Release all while-stepping collecting states currently associated
4350 with thread TINFO. */
4353 release_while_stepping_state_list (struct thread_info
*tinfo
)
4355 struct wstep_state
*head
;
4357 while (tinfo
->while_stepping
)
4359 head
= tinfo
->while_stepping
;
4360 tinfo
->while_stepping
= head
->next
;
4361 release_while_stepping_state (head
);
4365 /* If TINFO was handling a 'while-stepping' action, the step has
4366 finished, so collect any step data needed, and check if any more
4367 steps are required. Return true if the thread was indeed
4368 collecting tracepoint data, false otherwise. */
4371 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4373 struct tracepoint
*tpoint
;
4374 struct wstep_state
*wstep
;
4375 struct wstep_state
**wstep_link
;
4376 struct trap_tracepoint_ctx ctx
;
4378 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4380 if (agent_loaded_p ())
4381 upload_fast_traceframes ();
4383 /* Check if we were indeed collecting data for one of more
4384 tracepoints with a 'while-stepping' count. */
4385 if (tinfo
->while_stepping
== NULL
)
4390 /* We're not even tracing anymore. Stop this thread from
4392 release_while_stepping_state_list (tinfo
);
4394 /* The thread had stopped due to a single-step request indeed
4395 explained by a tracepoint. */
4399 wstep
= tinfo
->while_stepping
;
4400 wstep_link
= &tinfo
->while_stepping
;
4402 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4403 target_pid_to_str (tinfo
->entry
.id
),
4404 wstep
->tp_number
, paddress (wstep
->tp_address
));
4406 ctx
.base
.type
= trap_tracepoint
;
4407 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4409 while (wstep
!= NULL
)
4411 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4414 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4415 wstep
->tp_number
, paddress (wstep
->tp_address
),
4416 target_pid_to_str (tinfo
->entry
.id
));
4419 *wstep_link
= wstep
->next
;
4420 release_while_stepping_state (wstep
);
4421 wstep
= *wstep_link
;
4425 /* We've just finished one step. */
4426 ++wstep
->current_step
;
4429 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4430 stop_pc
, tpoint
, wstep
->current_step
);
4432 if (wstep
->current_step
>= tpoint
->step_count
)
4434 /* The requested numbers of steps have occurred. */
4435 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4436 target_pid_to_str (tinfo
->entry
.id
),
4437 wstep
->tp_number
, paddress (wstep
->tp_address
));
4439 /* Unlink the wstep. */
4440 *wstep_link
= wstep
->next
;
4441 release_while_stepping_state (wstep
);
4442 wstep
= *wstep_link
;
4444 /* Only check the hit count now, which ensure that we do all
4445 our stepping before stopping the run. */
4446 if (tpoint
->pass_count
> 0
4447 && tpoint
->hit_count
>= tpoint
->pass_count
4448 && stopping_tracepoint
== NULL
)
4449 stopping_tracepoint
= tpoint
;
4453 /* Keep single-stepping until the requested numbers of steps
4455 wstep_link
= &wstep
->next
;
4456 wstep
= *wstep_link
;
4459 if (stopping_tracepoint
4460 || trace_buffer_is_full
4461 || expr_eval_result
!= expr_eval_no_error
)
4471 /* Handle any internal tracing control breakpoint hits. That means,
4472 pull traceframes from the IPA to our buffer, and syncing both
4473 tracing agents when the IPA's tracing stops for some reason. */
4476 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4478 /* Pull in fast tracepoint trace frames from the inferior in-process
4479 agent's buffer into our buffer. */
4481 if (!agent_loaded_p ())
4484 upload_fast_traceframes ();
4486 /* Check if the in-process agent had decided we should stop
4488 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4490 int ipa_trace_buffer_is_full
;
4491 CORE_ADDR ipa_stopping_tracepoint
;
4492 int ipa_expr_eval_result
;
4493 CORE_ADDR ipa_error_tracepoint
;
4495 trace_debug ("lib stopped at stop_tracing");
4497 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4498 &ipa_trace_buffer_is_full
);
4500 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4501 &ipa_stopping_tracepoint
);
4502 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4504 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4505 &ipa_error_tracepoint
);
4506 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4508 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4509 &ipa_expr_eval_result
);
4510 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4512 trace_debug ("lib: trace_buffer_is_full: %d, "
4513 "stopping_tracepoint: %s, "
4514 "ipa_expr_eval_result: %d, "
4515 "error_tracepoint: %s, ",
4516 ipa_trace_buffer_is_full
,
4517 paddress (ipa_stopping_tracepoint
),
4518 ipa_expr_eval_result
,
4519 paddress (ipa_error_tracepoint
));
4523 if (ipa_trace_buffer_is_full
)
4524 trace_debug ("lib stopped due to full buffer.");
4525 if (ipa_stopping_tracepoint
)
4526 trace_debug ("lib stopped due to tpoint");
4527 if (ipa_stopping_tracepoint
)
4528 trace_debug ("lib stopped due to error");
4531 if (ipa_stopping_tracepoint
!= 0)
4534 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4536 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4538 expr_eval_result
= ipa_expr_eval_result
;
4540 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4545 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4547 trace_debug ("lib stopped at flush_trace_buffer");
4554 /* Return true if TINFO just hit a tracepoint. Collect data if
4558 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4560 struct tracepoint
*tpoint
;
4562 struct trap_tracepoint_ctx ctx
;
4564 /* Not tracing, don't handle. */
4568 ctx
.base
.type
= trap_tracepoint
;
4569 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4571 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4573 /* Note that we collect fast tracepoints here as well. We'll
4574 step over the fast tracepoint jump later, which avoids the
4575 double collect. However, we don't collect for static
4576 tracepoints here, because UST markers are compiled in program,
4577 and probes will be executed in program. So static tracepoints
4578 are collected there. */
4579 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4580 && tpoint
->type
!= static_tracepoint
)
4582 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4583 target_pid_to_str (tinfo
->entry
.id
),
4584 tpoint
->number
, paddress (tpoint
->address
));
4586 /* Test the condition if present, and collect if true. */
4588 || (condition_true_at_tracepoint
4589 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4590 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4593 if (stopping_tracepoint
4594 || trace_buffer_is_full
4595 || expr_eval_result
!= expr_eval_no_error
)
4599 /* If the tracepoint had a 'while-stepping' action, then set
4600 the thread to collect this tracepoint on the following
4602 else if (tpoint
->step_count
> 0)
4604 add_while_stepping_state (tinfo
,
4605 tpoint
->number
, tpoint
->address
);
4617 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4618 struct ust_marker_data
;
4619 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4620 struct traceframe
*tframe
);
4623 /* Create a trace frame for the hit of the given tracepoint in the
4627 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4628 struct tracepoint
*tpoint
)
4630 struct traceframe
*tframe
;
4633 /* Only count it as a hit when we actually collect data. */
4634 tpoint
->hit_count
++;
4636 /* If we've exceeded a defined pass count, record the event for
4637 later, and finish the collection for this hit. This test is only
4638 for nonstepping tracepoints, stepping tracepoints test at the end
4639 of their while-stepping loop. */
4640 if (tpoint
->pass_count
> 0
4641 && tpoint
->hit_count
>= tpoint
->pass_count
4642 && tpoint
->step_count
== 0
4643 && stopping_tracepoint
== NULL
)
4644 stopping_tracepoint
= tpoint
;
4646 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4647 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4649 tframe
= add_traceframe (tpoint
);
4653 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4655 #ifndef IN_PROCESS_AGENT
4656 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4657 tpoint
->number
, paddress (tpoint
->address
),
4658 tpoint
->actions_str
[acti
]);
4661 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4662 tpoint
->actions
[acti
]);
4665 finish_traceframe (tframe
);
4668 if (tframe
== NULL
&& tracing
)
4669 trace_buffer_is_full
= 1;
4672 #ifndef IN_PROCESS_AGENT
4675 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4677 struct tracepoint
*tpoint
, int current_step
)
4679 struct traceframe
*tframe
;
4682 trace_debug ("Making new step traceframe for "
4683 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4684 tpoint
->number
, paddress (tpoint
->address
),
4685 current_step
, tpoint
->step_count
,
4688 tframe
= add_traceframe (tpoint
);
4692 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4694 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4695 tpoint
->number
, paddress (tpoint
->address
),
4696 tpoint
->step_actions_str
[acti
]);
4698 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4699 tpoint
->step_actions
[acti
]);
4702 finish_traceframe (tframe
);
4705 if (tframe
== NULL
&& tracing
)
4706 trace_buffer_is_full
= 1;
4711 #ifdef IN_PROCESS_AGENT
4712 /* The target description used by the IPA. Given that the IPA library
4713 is built for a specific architecture that is loaded into the
4714 inferior, there only needs to be one such description per
4716 const struct target_desc
*ipa_tdesc
;
4719 static struct regcache
*
4720 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4722 struct regcache
*regcache
= NULL
;
4724 #ifdef IN_PROCESS_AGENT
4725 if (ctx
->type
== fast_tracepoint
)
4727 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4728 if (!fctx
->regcache_initted
)
4730 fctx
->regcache_initted
= 1;
4731 init_register_cache (&fctx
->regcache
, ipa_tdesc
, fctx
->regspace
);
4732 supply_regblock (&fctx
->regcache
, NULL
);
4733 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4735 regcache
= &fctx
->regcache
;
4738 if (ctx
->type
== static_tracepoint
)
4740 struct static_tracepoint_ctx
*sctx
4741 = (struct static_tracepoint_ctx
*) ctx
;
4743 if (!sctx
->regcache_initted
)
4745 sctx
->regcache_initted
= 1;
4746 init_register_cache (&sctx
->regcache
, ipa_tdesc
, sctx
->regspace
);
4747 supply_regblock (&sctx
->regcache
, NULL
);
4748 /* Pass down the tracepoint address, because REGS doesn't
4749 include the PC, but we know what it must have been. */
4750 supply_static_tracepoint_registers (&sctx
->regcache
,
4751 (const unsigned char *)
4753 sctx
->tpoint
->address
);
4755 regcache
= &sctx
->regcache
;
4759 if (ctx
->type
== trap_tracepoint
)
4761 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4762 regcache
= tctx
->regcache
;
4766 gdb_assert (regcache
!= NULL
);
4772 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4774 struct tracepoint
*tpoint
,
4775 struct traceframe
*tframe
,
4776 struct tracepoint_action
*taction
)
4778 enum eval_result_type err
;
4780 switch (taction
->type
)
4784 struct collect_memory_action
*maction
;
4785 struct eval_agent_expr_context ax_ctx
;
4787 maction
= (struct collect_memory_action
*) taction
;
4788 ax_ctx
.regcache
= NULL
;
4789 ax_ctx
.tframe
= tframe
;
4790 ax_ctx
.tpoint
= tpoint
;
4792 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4793 pulongest (maction
->len
),
4794 paddress (maction
->addr
), maction
->basereg
);
4795 /* (should use basereg) */
4796 agent_mem_read (&ax_ctx
, NULL
, (CORE_ADDR
) maction
->addr
,
4802 unsigned char *regspace
;
4803 struct regcache tregcache
;
4804 struct regcache
*context_regcache
;
4807 trace_debug ("Want to collect registers");
4809 context_regcache
= get_context_regcache (ctx
);
4810 regcache_size
= register_cache_size (context_regcache
->tdesc
);
4812 /* Collect all registers for now. */
4813 regspace
= add_traceframe_block (tframe
, tpoint
, 1 + regcache_size
);
4814 if (regspace
== NULL
)
4816 trace_debug ("Trace buffer block allocation failed, skipping");
4819 /* Identify a register block. */
4822 /* Wrap the regblock in a register cache (in the stack, we
4823 don't want to malloc here). */
4824 init_register_cache (&tregcache
, context_regcache
->tdesc
,
4827 /* Copy the register data to the regblock. */
4828 regcache_cpy (&tregcache
, context_regcache
);
4830 #ifndef IN_PROCESS_AGENT
4831 /* On some platforms, trap-based tracepoints will have the PC
4832 pointing to the next instruction after the trap, but we
4833 don't want the user or GDB trying to guess whether the
4834 saved PC needs adjusting; so always record the adjusted
4835 stop_pc. Note that we can't use tpoint->address instead,
4836 since it will be wrong for while-stepping actions. This
4837 adjustment is a nop for fast tracepoints collected from the
4838 in-process lib (but not if GDBserver is collecting one
4839 preemptively), since the PC had already been adjusted to
4840 contain the tracepoint's address by the jump pad. */
4841 trace_debug ("Storing stop pc (0x%s) in regblock",
4842 paddress (stop_pc
));
4844 /* This changes the regblock, not the thread's
4846 regcache_write_pc (&tregcache
, stop_pc
);
4852 struct eval_expr_action
*eaction
;
4853 struct eval_agent_expr_context ax_ctx
;
4855 eaction
= (struct eval_expr_action
*) taction
;
4856 ax_ctx
.regcache
= get_context_regcache (ctx
);
4857 ax_ctx
.tframe
= tframe
;
4858 ax_ctx
.tpoint
= tpoint
;
4860 trace_debug ("Want to evaluate expression");
4862 err
= gdb_eval_agent_expr (&ax_ctx
, eaction
->expr
, NULL
);
4864 if (err
!= expr_eval_no_error
)
4866 record_tracepoint_error (tpoint
, "action expression", err
);
4873 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4874 trace_debug ("Want to collect static trace data");
4875 collect_ust_data_at_tracepoint (ctx
, tframe
);
4877 trace_debug ("warning: collecting static trace data, "
4878 "but static tracepoints are not supported");
4883 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4889 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4890 struct tracepoint
*tpoint
)
4893 enum eval_result_type err
;
4895 /* Presently, gdbserver doesn't run compiled conditions, only the
4896 IPA does. If the program stops at a fast tracepoint's address
4897 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4898 gdbserver preemptively collect the fast tracepoint. Later, on
4899 resume, gdbserver steps over the fast tracepoint like it steps
4900 over breakpoints, so that the IPA doesn't see that fast
4901 tracepoint. This avoids double collects of fast tracepoints in
4902 that stopping scenario. Having gdbserver itself handle the fast
4903 tracepoint gives the user a consistent view of when fast or trap
4904 tracepoints are collected, compared to an alternative where only
4905 trap tracepoints are collected on stop, and fast tracepoints on
4906 resume. When a fast tracepoint is being processed by gdbserver,
4907 it is always the non-compiled condition expression that is
4909 #ifdef IN_PROCESS_AGENT
4910 if (tpoint
->compiled_cond
)
4911 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (ctx
, &value
);
4915 struct eval_agent_expr_context ax_ctx
;
4917 ax_ctx
.regcache
= get_context_regcache (ctx
);
4918 ax_ctx
.tframe
= NULL
;
4919 ax_ctx
.tpoint
= tpoint
;
4921 err
= gdb_eval_agent_expr (&ax_ctx
, tpoint
->cond
, &value
);
4923 if (err
!= expr_eval_no_error
)
4925 record_tracepoint_error (tpoint
, "condition", err
);
4926 /* The error case must return false. */
4930 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4931 tpoint
->number
, paddress (tpoint
->address
),
4933 return (value
? 1 : 0);
4936 /* Do memory copies for bytecodes. */
4937 /* Do the recording of memory blocks for actions and bytecodes. */
4940 agent_mem_read (struct eval_agent_expr_context
*ctx
,
4941 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4943 unsigned char *mspace
;
4944 ULONGEST remaining
= len
;
4945 unsigned short blocklen
;
4947 /* If a 'to' buffer is specified, use it. */
4950 read_inferior_memory (from
, to
, len
);
4954 /* Otherwise, create a new memory block in the trace buffer. */
4955 while (remaining
> 0)
4959 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4960 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4961 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
4964 /* Identify block as a memory block. */
4967 /* Record address and size. */
4968 memcpy (mspace
, &from
, sizeof (from
));
4969 mspace
+= sizeof (from
);
4970 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4971 mspace
+= sizeof (blocklen
);
4972 /* Record the memory block proper. */
4973 read_inferior_memory (from
, mspace
, blocklen
);
4974 trace_debug ("%d bytes recorded", blocklen
);
4975 remaining
-= blocklen
;
4982 agent_mem_read_string (struct eval_agent_expr_context
*ctx
,
4983 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4985 unsigned char *buf
, *mspace
;
4986 ULONGEST remaining
= len
;
4987 unsigned short blocklen
, i
;
4989 /* To save a bit of space, block lengths are 16-bit, so break large
4990 requests into multiple blocks. Bordering on overkill for strings,
4991 but it could happen that someone specifies a large max length. */
4992 while (remaining
> 0)
4996 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4997 /* We want working space to accumulate nonzero bytes, since
4998 traceframes must have a predecided size (otherwise it gets
4999 harder to wrap correctly for the circular case, etc). */
5000 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
5001 for (i
= 0; i
< blocklen
; ++i
)
5003 /* Read the string one byte at a time, in case the string is
5004 at the end of a valid memory area - we don't want a
5005 correctly-terminated string to engender segvio
5007 read_inferior_memory (from
+ i
, buf
+ i
, 1);
5012 /* Make sure outer loop stops now too. */
5013 remaining
= blocklen
;
5017 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
5018 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
5024 /* Identify block as a memory block. */
5027 /* Record address and size. */
5028 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
5029 mspace
+= sizeof (from
);
5030 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
5031 mspace
+= sizeof (blocklen
);
5032 /* Copy the string contents. */
5033 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
5034 remaining
-= blocklen
;
5041 /* Record the value of a trace state variable. */
5044 agent_tsv_read (struct eval_agent_expr_context
*ctx
, int n
)
5046 unsigned char *vspace
;
5049 vspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
,
5050 1 + sizeof (n
) + sizeof (LONGEST
));
5053 /* Identify block as a variable. */
5055 /* Record variable's number and value. */
5056 memcpy (vspace
+ 1, &n
, sizeof (n
));
5057 val
= get_trace_state_variable_value (n
);
5058 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
5059 trace_debug ("Variable %d recorded", n
);
5063 #ifndef IN_PROCESS_AGENT
5065 /* Callback for traceframe_walk_blocks, used to find a given block
5066 type in a traceframe. */
5069 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
5071 char *wantedp
= data
;
5073 if (*wantedp
== blocktype
)
5079 /* Walk over all traceframe blocks of the traceframe buffer starting
5080 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5081 block found, passing in DATA unmodified. If CALLBACK returns true,
5082 this returns a pointer to where the block is found. Returns NULL
5083 if no callback call returned true, indicating that all blocks have
5086 static unsigned char *
5087 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
5089 int (*callback
) (char blocktype
,
5090 unsigned char *dataptr
,
5094 unsigned char *dataptr
;
5098 trace_debug ("traceframe %d has no data", tfnum
);
5102 /* Iterate through a traceframe's blocks, looking for a block of the
5104 for (dataptr
= database
;
5105 dataptr
< database
+ datasize
;
5109 unsigned short mlen
;
5111 if (dataptr
== trace_buffer_wrap
)
5113 /* Adjust to reflect wrapping part of the frame around to
5115 datasize
= dataptr
- database
;
5116 dataptr
= database
= trace_buffer_lo
;
5119 blocktype
= *dataptr
++;
5121 if ((*callback
) (blocktype
, dataptr
, data
))
5127 /* Skip over the registers block. */
5128 dataptr
+= current_target_desc ()->registers_size
;
5131 /* Skip over the memory block. */
5132 dataptr
+= sizeof (CORE_ADDR
);
5133 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5134 dataptr
+= (sizeof (mlen
) + mlen
);
5137 /* Skip over the TSV block. */
5138 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5141 /* Skip over the static trace data block. */
5142 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5143 dataptr
+= (sizeof (mlen
) + mlen
);
5146 trace_debug ("traceframe %d has unknown block type 0x%x",
5155 /* Look for the block of type TYPE_WANTED in the trameframe starting
5156 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5159 static unsigned char *
5160 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5161 int tfnum
, char type_wanted
)
5163 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5164 match_blocktype
, &type_wanted
);
5167 static unsigned char *
5168 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5170 unsigned char *regblock
;
5172 regblock
= traceframe_find_block_type (tframe
->data
,
5176 if (regblock
== NULL
)
5177 trace_debug ("traceframe %d has no register data", tfnum
);
5182 /* Get registers from a traceframe. */
5185 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5187 unsigned char *dataptr
;
5188 struct tracepoint
*tpoint
;
5189 struct traceframe
*tframe
;
5191 tframe
= find_traceframe (tfnum
);
5195 trace_debug ("traceframe %d not found", tfnum
);
5199 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5200 if (dataptr
== NULL
)
5202 /* Mark registers unavailable. */
5203 supply_regblock (regcache
, NULL
);
5205 /* We can generally guess at a PC, although this will be
5206 misleading for while-stepping frames and multi-location
5208 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5210 regcache_write_pc (regcache
, tpoint
->address
);
5213 supply_regblock (regcache
, dataptr
);
5219 traceframe_get_pc (struct traceframe
*tframe
)
5221 struct regcache regcache
;
5222 unsigned char *dataptr
;
5223 const struct target_desc
*tdesc
= current_target_desc ();
5225 dataptr
= traceframe_find_regblock (tframe
, -1);
5226 if (dataptr
== NULL
)
5229 init_register_cache (®cache
, tdesc
, dataptr
);
5230 return regcache_read_pc (®cache
);
5233 /* Read a requested block of memory from a trace frame. */
5236 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5237 unsigned char *buf
, ULONGEST length
,
5240 struct traceframe
*tframe
;
5241 unsigned char *database
, *dataptr
;
5242 unsigned int datasize
;
5244 unsigned short mlen
;
5246 trace_debug ("traceframe_read_mem");
5248 tframe
= find_traceframe (tfnum
);
5252 trace_debug ("traceframe %d not found", tfnum
);
5256 datasize
= tframe
->data_size
;
5257 database
= dataptr
= &tframe
->data
[0];
5259 /* Iterate through a traceframe's blocks, looking for memory. */
5260 while ((dataptr
= traceframe_find_block_type (dataptr
,
5262 - (dataptr
- database
),
5263 tfnum
, 'M')) != NULL
)
5265 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5266 dataptr
+= sizeof (maddr
);
5267 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5268 dataptr
+= sizeof (mlen
);
5269 trace_debug ("traceframe %d has %d bytes at %s",
5270 tfnum
, mlen
, paddress (maddr
));
5272 /* If the block includes the first part of the desired range,
5273 return as much it has; GDB will re-request the remainder,
5274 which might be in a different block of this trace frame. */
5275 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5277 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5281 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5286 /* Skip over this block. */
5290 trace_debug ("traceframe %d has no memory data for the desired region",
5298 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5301 struct traceframe
*tframe
;
5302 unsigned char *database
, *dataptr
;
5303 unsigned int datasize
;
5307 trace_debug ("traceframe_read_tsv");
5309 tfnum
= current_traceframe
;
5313 trace_debug ("no current traceframe");
5317 tframe
= find_traceframe (tfnum
);
5321 trace_debug ("traceframe %d not found", tfnum
);
5325 datasize
= tframe
->data_size
;
5326 database
= dataptr
= &tframe
->data
[0];
5328 /* Iterate through a traceframe's blocks, looking for the last
5330 while ((dataptr
= traceframe_find_block_type (dataptr
,
5332 - (dataptr
- database
),
5333 tfnum
, 'V')) != NULL
)
5335 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5336 dataptr
+= sizeof (vnum
);
5338 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5340 /* Check that this is the variable we want. */
5343 memcpy (val
, dataptr
, sizeof (*val
));
5347 /* Skip over this block. */
5348 dataptr
+= sizeof (LONGEST
);
5352 trace_debug ("traceframe %d has no data for variable %d",
5357 /* Read a requested block of static tracepoint data from a trace
5361 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5362 unsigned char *buf
, ULONGEST length
,
5365 struct traceframe
*tframe
;
5366 unsigned char *database
, *dataptr
;
5367 unsigned int datasize
;
5368 unsigned short mlen
;
5370 trace_debug ("traceframe_read_sdata");
5372 tframe
= find_traceframe (tfnum
);
5376 trace_debug ("traceframe %d not found", tfnum
);
5380 datasize
= tframe
->data_size
;
5381 database
= &tframe
->data
[0];
5383 /* Iterate through a traceframe's blocks, looking for static
5385 dataptr
= traceframe_find_block_type (database
, datasize
,
5387 if (dataptr
!= NULL
)
5389 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5390 dataptr
+= sizeof (mlen
);
5393 if (offset
+ length
> mlen
)
5394 length
= mlen
- offset
;
5396 memcpy (buf
, dataptr
, length
);
5404 trace_debug ("traceframe %d has no static trace data", tfnum
);
5410 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5411 object. DATA is pointer to a struct buffer holding the
5412 traceframe-info object being built. */
5415 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5417 struct buffer
*buffer
= data
;
5423 unsigned short mlen
;
5426 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5427 dataptr
+= sizeof (maddr
);
5428 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5429 dataptr
+= sizeof (mlen
);
5430 buffer_xml_printf (buffer
,
5431 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5432 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5439 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5440 buffer_xml_printf (buffer
, "<tvar id=\"%d\"/>\n", vnum
);
5449 warning ("Unhandled trace block type (%d) '%c ' "
5450 "while building trace frame info.",
5451 blocktype
, blocktype
);
5458 /* Build a traceframe-info object for traceframe number TFNUM into
5462 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5464 struct traceframe
*tframe
;
5466 trace_debug ("traceframe_read_info");
5468 tframe
= find_traceframe (tfnum
);
5472 trace_debug ("traceframe %d not found", tfnum
);
5476 buffer_grow_str (buffer
, "<traceframe-info>\n");
5477 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5478 tfnum
, build_traceframe_info_xml
, buffer
);
5479 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5483 /* Return the first fast tracepoint whose jump pad contains PC. */
5485 static struct tracepoint
*
5486 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5488 struct tracepoint
*tpoint
;
5490 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5491 if (tpoint
->type
== fast_tracepoint
)
5492 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5498 /* Return the first fast tracepoint whose trampoline contains PC. */
5500 static struct tracepoint
*
5501 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5503 struct tracepoint
*tpoint
;
5505 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5507 if (tpoint
->type
== fast_tracepoint
5508 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5515 /* Return GDBserver's tracepoint that matches the IP Agent's
5516 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5519 static struct tracepoint
*
5520 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5522 struct tracepoint
*tpoint
;
5524 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5525 if (tpoint
->type
== fast_tracepoint
)
5526 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5534 /* The type of the object that is used to synchronize fast tracepoint
5537 typedef struct collecting_t
5539 /* The fast tracepoint number currently collecting. */
5542 /* A number that GDBserver can use to identify the thread that is
5543 presently holding the collect lock. This need not (and usually
5544 is not) the thread id, as getting the current thread ID usually
5545 requires a system call, which we want to avoid like the plague.
5546 Usually this is thread's TCB, found in the TLS (pseudo-)
5547 register, which is readable with a single insn on several
5549 uintptr_t thread_area
;
5552 #ifndef IN_PROCESS_AGENT
5555 force_unlock_trace_buffer (void)
5557 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5560 /* Check if the thread identified by THREAD_AREA which is stopped at
5561 STOP_PC, is presently locking the fast tracepoint collection, and
5562 if so, gather some status of said collection. Returns 0 if the
5563 thread isn't collecting or in the jump pad at all. 1, if in the
5564 jump pad (or within gdb_collect) and hasn't executed the adjusted
5565 original insn yet (can set a breakpoint there and run to it). 2,
5566 if presently executing the adjusted original insn --- in which
5567 case, if we want to move the thread out of the jump pad, we need to
5568 single-step it until this function returns 0. */
5571 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5573 struct fast_tpoint_collect_status
*status
)
5575 CORE_ADDR ipa_collecting
;
5576 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5577 CORE_ADDR ipa_gdb_trampoline_buffer
;
5578 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5579 struct tracepoint
*tpoint
;
5580 int needs_breakpoint
;
5582 /* The thread THREAD_AREA is either:
5584 0. not collecting at all, not within the jump pad, or within
5585 gdb_collect or one of its callees.
5587 1. in the jump pad and haven't reached gdb_collect
5589 2. within gdb_collect (out of the jump pad) (collect is set)
5591 3. we're in the jump pad, after gdb_collect having returned,
5592 possibly executing the adjusted insns.
5594 For cases 1 and 3, `collecting' may or not be set. The jump pad
5595 doesn't have any complicated jump logic, so we can tell if the
5596 thread is executing the adjust original insn or not by just
5597 matching STOP_PC with known jump pad addresses. If we it isn't
5598 yet executing the original insn, set a breakpoint there, and let
5599 the thread run to it, so to quickly step over a possible (many
5600 insns) gdb_collect call. Otherwise, or when the breakpoint is
5601 hit, only a few (small number of) insns are left to be executed
5602 in the jump pad. Single-step the thread until it leaves the
5607 needs_breakpoint
= 0;
5608 trace_debug ("fast_tracepoint_collecting");
5610 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5611 &ipa_gdb_jump_pad_buffer
))
5613 internal_error (__FILE__
, __LINE__
,
5614 "error extracting `gdb_jump_pad_buffer'");
5616 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5617 &ipa_gdb_jump_pad_buffer_end
))
5619 internal_error (__FILE__
, __LINE__
,
5620 "error extracting `gdb_jump_pad_buffer_end'");
5623 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5624 &ipa_gdb_trampoline_buffer
))
5626 internal_error (__FILE__
, __LINE__
,
5627 "error extracting `gdb_trampoline_buffer'");
5629 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5630 &ipa_gdb_trampoline_buffer_end
))
5632 internal_error (__FILE__
, __LINE__
,
5633 "error extracting `gdb_trampoline_buffer_end'");
5636 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5637 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5639 /* We can tell which tracepoint(s) the thread is collecting by
5640 matching the jump pad address back to the tracepoint. */
5641 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5644 warning ("in jump pad, but no matching tpoint?");
5649 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5651 tpoint
->number
, paddress (tpoint
->address
),
5652 paddress (tpoint
->jump_pad
),
5653 paddress (tpoint
->jump_pad_end
),
5654 paddress (tpoint
->adjusted_insn_addr
),
5655 paddress (tpoint
->adjusted_insn_addr_end
));
5658 /* Definitely in the jump pad. May or may not need
5659 fast-exit-jump-pad breakpoint. */
5660 if (tpoint
->jump_pad
<= stop_pc
5661 && stop_pc
< tpoint
->adjusted_insn_addr
)
5662 needs_breakpoint
= 1;
5664 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5665 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5667 /* We can tell which tracepoint(s) the thread is collecting by
5668 matching the trampoline address back to the tracepoint. */
5669 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5672 warning ("in trampoline, but no matching tpoint?");
5677 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5678 tpoint
->number
, paddress (tpoint
->address
),
5679 paddress (tpoint
->trampoline
),
5680 paddress (tpoint
->trampoline_end
));
5683 /* Have not reached jump pad yet, but treat the trampoline as a
5684 part of the jump pad that is before the adjusted original
5686 needs_breakpoint
= 1;
5690 collecting_t ipa_collecting_obj
;
5692 /* If `collecting' is set/locked, then the THREAD_AREA thread
5693 may or not be the one holding the lock. We have to read the
5694 lock to find out. */
5696 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5699 trace_debug ("fast_tracepoint_collecting:"
5700 " failed reading 'collecting' in the inferior");
5704 if (!ipa_collecting
)
5706 trace_debug ("fast_tracepoint_collecting: not collecting"
5707 " (and nobody is).");
5711 /* Some thread is collecting. Check which. */
5712 if (read_inferior_memory (ipa_collecting
,
5713 (unsigned char *) &ipa_collecting_obj
,
5714 sizeof (ipa_collecting_obj
)) != 0)
5717 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5719 trace_debug ("fast_tracepoint_collecting: not collecting "
5720 "(another thread is)");
5725 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5728 warning ("fast_tracepoint_collecting: collecting, "
5729 "but tpoint %s not found?",
5730 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5734 /* The thread is within `gdb_collect', skip over the rest of
5735 fast tracepoint collection quickly using a breakpoint. */
5736 needs_breakpoint
= 1;
5739 /* The caller wants a bit of status detail. */
5742 status
->tpoint_num
= tpoint
->number
;
5743 status
->tpoint_addr
= tpoint
->address
;
5744 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5745 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5748 if (needs_breakpoint
)
5750 /* Hasn't executed the original instruction yet. Set breakpoint
5751 there, and wait till it's hit, then single-step until exiting
5755 fast_tracepoint_collecting, returning continue-until-break at %s",
5756 paddress (tpoint
->adjusted_insn_addr
));
5758 return 1; /* continue */
5762 /* Just single-step until exiting the jump pad. */
5764 trace_debug ("fast_tracepoint_collecting, returning "
5765 "need-single-step (%s-%s)",
5766 paddress (tpoint
->adjusted_insn_addr
),
5767 paddress (tpoint
->adjusted_insn_addr_end
));
5769 return 2; /* single-step */
5775 #ifdef IN_PROCESS_AGENT
5777 /* The global fast tracepoint collect lock. Points to a collecting_t
5778 object built on the stack by the jump pad, if presently locked;
5779 NULL if it isn't locked. Note that this lock *must* be set while
5780 executing any *function other than the jump pad. See
5781 fast_tracepoint_collecting. */
5783 IP_AGENT_EXPORT_VAR collecting_t
*collecting
;
5786 /* This routine, called from the jump pad (in asm) is designed to be
5787 called from the jump pads of fast tracepoints, thus it is on the
5790 IP_AGENT_EXPORT_FUNC
void
5791 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5793 struct fast_tracepoint_ctx ctx
;
5795 /* Don't do anything until the trace run is completely set up. */
5799 ctx
.base
.type
= fast_tracepoint
;
5801 ctx
.regcache_initted
= 0;
5802 /* Wrap the regblock in a register cache (in the stack, we don't
5803 want to malloc here). */
5804 ctx
.regspace
= alloca (ipa_tdesc
->registers_size
);
5805 if (ctx
.regspace
== NULL
)
5807 trace_debug ("Trace buffer block allocation failed, skipping");
5811 for (ctx
.tpoint
= tpoint
;
5812 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5813 ctx
.tpoint
= ctx
.tpoint
->next
)
5815 if (!ctx
.tpoint
->enabled
)
5818 /* Multiple tracepoints of different types, such as fast tracepoint and
5819 static tracepoint, can be set at the same address. */
5820 if (ctx
.tpoint
->type
!= tpoint
->type
)
5823 /* Test the condition if present, and collect if true. */
5824 if (ctx
.tpoint
->cond
== NULL
5825 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5828 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5829 ctx
.tpoint
->address
, ctx
.tpoint
);
5831 /* Note that this will cause original insns to be written back
5832 to where we jumped from, but that's OK because we're jumping
5833 back to the next whole instruction. This will go badly if
5834 instruction restoration is not atomic though. */
5835 if (stopping_tracepoint
5836 || trace_buffer_is_full
5837 || expr_eval_result
!= expr_eval_no_error
)
5845 /* If there was a condition and it evaluated to false, the only
5846 way we would stop tracing is if there was an error during
5847 condition expression evaluation. */
5848 if (expr_eval_result
!= expr_eval_no_error
)
5859 #ifndef IN_PROCESS_AGENT
5862 get_raw_reg_func_addr (void)
5864 return ipa_sym_addrs
.addr_get_raw_reg
;
5868 get_get_tsv_func_addr (void)
5870 return ipa_sym_addrs
.addr_get_trace_state_variable_value
;
5874 get_set_tsv_func_addr (void)
5876 return ipa_sym_addrs
.addr_set_trace_state_variable_value
;
5880 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5881 CORE_ADDR
*jump_entry
)
5883 CORE_ADDR entry_point
= *jump_entry
;
5884 enum eval_result_type err
;
5886 trace_debug ("Starting condition compilation for tracepoint %d\n",
5889 /* Initialize the global pointer to the code being built. */
5890 current_insn_ptr
= *jump_entry
;
5894 err
= compile_bytecodes (tpoint
->cond
);
5896 if (err
== expr_eval_no_error
)
5900 /* Record the beginning of the compiled code. */
5901 tpoint
->compiled_cond
= entry_point
;
5903 trace_debug ("Condition compilation for tracepoint %d complete\n",
5908 /* Leave the unfinished code in situ, but don't point to it. */
5910 tpoint
->compiled_cond
= 0;
5912 trace_debug ("Condition compilation for tracepoint %d failed, "
5914 tpoint
->number
, err
);
5917 /* Update the code pointer passed in. Note that we do this even if
5918 the compile fails, so that we can look at the partial results
5919 instead of letting them be overwritten. */
5920 *jump_entry
= current_insn_ptr
;
5922 /* Leave a gap, to aid dump decipherment. */
5926 /* We'll need to adjust these when we consider bi-arch setups, and big
5930 write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
)
5932 return write_inferior_memory (where
,
5933 (unsigned char *) &ptr
, sizeof (void *));
5936 /* The base pointer of the IPA's heap. This is the only memory the
5937 IPA is allowed to use. The IPA should _not_ call the inferior's
5938 `malloc' during operation. That'd be slow, and, most importantly,
5939 it may not be safe. We may be collecting a tracepoint in a signal
5940 handler, for example. */
5941 static CORE_ADDR target_tp_heap
;
5943 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5947 target_malloc (ULONGEST size
)
5951 if (target_tp_heap
== 0)
5953 /* We have the pointer *address*, need what it points to. */
5954 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5957 internal_error (__FILE__
, __LINE__
,
5958 "couldn't get target heap head pointer");
5962 ptr
= target_tp_heap
;
5963 target_tp_heap
+= size
;
5965 /* Pad to 8-byte alignment. */
5966 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
5972 download_agent_expr (struct agent_expr
*expr
)
5974 CORE_ADDR expr_addr
;
5975 CORE_ADDR expr_bytes
;
5977 expr_addr
= target_malloc (sizeof (*expr
));
5978 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
5980 expr_bytes
= target_malloc (expr
->length
);
5981 write_inferior_data_ptr (expr_addr
+ offsetof (struct agent_expr
, bytes
),
5983 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
5988 /* Align V up to N bits. */
5989 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5991 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5994 download_tracepoint_1 (struct tracepoint
*tpoint
)
5996 struct tracepoint target_tracepoint
;
5997 CORE_ADDR tpptr
= 0;
5999 gdb_assert (tpoint
->type
== fast_tracepoint
6000 || tpoint
->type
== static_tracepoint
);
6002 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
6004 CORE_ADDR jentry
, jump_entry
;
6006 jentry
= jump_entry
= get_jump_space_head ();
6008 if (tpoint
->cond
!= NULL
)
6010 /* Pad to 8-byte alignment. (needed?) */
6011 /* Actually this should be left for the target to
6013 jentry
= UALIGN (jentry
, 8);
6015 compile_tracepoint_condition (tpoint
, &jentry
);
6018 /* Pad to 8-byte alignment. */
6019 jentry
= UALIGN (jentry
, 8);
6020 claim_jump_space (jentry
- jump_entry
);
6023 target_tracepoint
= *tpoint
;
6025 tpptr
= target_malloc (sizeof (*tpoint
));
6026 tpoint
->obj_addr_on_target
= tpptr
;
6028 /* Write the whole object. We'll fix up its pointers in a bit.
6029 Assume no next for now. This is fixed up above on the next
6030 iteration, if there's any. */
6031 target_tracepoint
.next
= NULL
;
6032 /* Need to clear this here too, since we're downloading the
6033 tracepoints before clearing our own copy. */
6034 target_tracepoint
.hit_count
= 0;
6036 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
6037 sizeof (target_tracepoint
));
6040 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
6042 download_agent_expr (tpoint
->cond
));
6044 if (tpoint
->numactions
)
6047 CORE_ADDR actions_array
;
6049 /* The pointers array. */
6051 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
6052 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
6056 /* Now for each pointer, download the action. */
6057 for (i
= 0; i
< tpoint
->numactions
; i
++)
6059 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6060 CORE_ADDR ipa_action
= action
->ops
->download (action
);
6062 if (ipa_action
!= 0)
6063 write_inferior_data_ptr
6064 (actions_array
+ i
* sizeof (*tpoint
->actions
),
6070 #define IPA_PROTO_FAST_TRACE_FLAG 0
6071 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
6072 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
6073 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
6074 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
6076 /* Send a command to agent to download and install tracepoint TPOINT. */
6079 tracepoint_send_agent (struct tracepoint
*tpoint
)
6081 char buf
[IPA_CMD_BUF_SIZE
];
6086 strcpy (p
, "FastTrace:");
6089 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
6090 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
6091 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
6092 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
6093 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
6094 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
6095 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
6096 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
6097 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
6098 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
6099 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
6102 p
= agent_expr_send (p
, tpoint
->cond
);
6104 /* tracepoint_action */
6105 for (i
= 0; i
< tpoint
->numactions
; i
++)
6107 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6109 p
[0] = action
->type
;
6110 p
= action
->ops
->send (&p
[1], action
);
6113 get_jump_space_head ();
6114 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6115 agent can use jump pad from it. */
6116 if (tpoint
->type
== fast_tracepoint
)
6118 memcpy (p
, &gdb_jump_pad_head
, 8);
6122 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
6126 if (!startswith (buf
, "OK"))
6129 /* The value of tracepoint's target address is stored in BUF. */
6130 memcpy (&tpoint
->obj_addr_on_target
,
6131 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6133 if (tpoint
->type
== fast_tracepoint
)
6136 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6139 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6140 (unsigned int) tpoint
->obj_addr_on_target
,
6141 (unsigned int) gdb_jump_pad_head
);
6143 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6145 /* This has been done in agent. We should also set up record for it. */
6146 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6149 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6156 download_tracepoint (struct tracepoint
*tpoint
)
6158 struct tracepoint
*tp
, *tp_prev
;
6160 if (tpoint
->type
!= fast_tracepoint
6161 && tpoint
->type
!= static_tracepoint
)
6164 download_tracepoint_1 (tpoint
);
6166 /* Find the previous entry of TPOINT, which is fast tracepoint or
6167 static tracepoint. */
6169 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6171 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6177 CORE_ADDR tp_prev_target_next_addr
;
6179 /* Insert TPOINT after TP_PREV in IPA. */
6180 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6181 + offsetof (struct tracepoint
, next
),
6182 &tp_prev_target_next_addr
))
6184 internal_error (__FILE__
, __LINE__
,
6185 "error reading `tp_prev->next'");
6188 /* tpoint->next = tp_prev->next */
6189 write_inferior_data_ptr (tpoint
->obj_addr_on_target
6190 + offsetof (struct tracepoint
, next
),
6191 tp_prev_target_next_addr
);
6192 /* tp_prev->next = tpoint */
6193 write_inferior_data_ptr (tp_prev
->obj_addr_on_target
6194 + offsetof (struct tracepoint
, next
),
6195 tpoint
->obj_addr_on_target
);
6198 /* First object in list, set the head pointer in the
6200 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
,
6201 tpoint
->obj_addr_on_target
);
6206 download_trace_state_variables (void)
6208 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6209 struct trace_state_variable
*tsv
;
6211 /* Start out empty. */
6212 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6214 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6216 struct trace_state_variable target_tsv
;
6218 /* TSV's with a getter have been initialized equally in both the
6219 inferior and GDBserver. Skip them. */
6220 if (tsv
->getter
!= NULL
)
6226 ptr
= target_malloc (sizeof (*tsv
));
6228 if (tsv
== trace_state_variables
)
6230 /* First object in list, set the head pointer in the
6233 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
,
6238 write_inferior_data_ptr (prev_ptr
6239 + offsetof (struct trace_state_variable
,
6244 /* Write the whole object. We'll fix up its pointers in a bit.
6245 Assume no next, fixup when needed. */
6246 target_tsv
.next
= NULL
;
6248 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6249 sizeof (target_tsv
));
6251 if (tsv
->name
!= NULL
)
6253 size_t size
= strlen (tsv
->name
) + 1;
6254 CORE_ADDR name_addr
= target_malloc (size
);
6255 write_inferior_memory (name_addr
,
6256 (unsigned char *) tsv
->name
, size
);
6257 write_inferior_data_ptr (ptr
6258 + offsetof (struct trace_state_variable
,
6263 gdb_assert (tsv
->getter
== NULL
);
6268 /* Fixup the next pointer in the last item in the list. */
6269 write_inferior_data_ptr (prev_ptr
6270 + offsetof (struct trace_state_variable
,
6275 /* Upload complete trace frames out of the IP Agent's trace buffer
6276 into GDBserver's trace buffer. This always uploads either all or
6277 no trace frames. This is the counter part of
6278 `trace_alloc_trace_buffer'. See its description of the atomic
6279 synching mechanism. */
6282 upload_fast_traceframes (void)
6284 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6285 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6287 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6288 unsigned int curr_tbctrl_idx
;
6289 unsigned int ipa_trace_buffer_ctrl_curr
;
6290 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6291 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6292 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6293 CORE_ADDR ipa_trace_buffer_lo
;
6294 CORE_ADDR ipa_trace_buffer_hi
;
6296 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6297 &ipa_traceframe_read_count_racy
))
6299 /* This will happen in most targets if the current thread is
6304 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6305 &ipa_traceframe_write_count_racy
))
6308 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6309 ipa_traceframe_write_count_racy
6310 - ipa_traceframe_read_count_racy
,
6311 ipa_traceframe_write_count_racy
,
6312 ipa_traceframe_read_count_racy
);
6314 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6317 about_to_request_buffer_space_bkpt
6318 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6321 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6322 &ipa_trace_buffer_ctrl_curr
))
6325 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6327 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6330 unsigned int prev
, counter
;
6332 /* Update the token, with new counters, and the GDBserver stamp
6333 bit. Alway reuse the current TBC index. */
6334 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6335 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6337 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6343 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6344 ipa_trace_buffer_ctrl_curr
))
6347 trace_debug ("Lib: Committed %08x -> %08x",
6348 ipa_trace_buffer_ctrl_curr_old
,
6349 ipa_trace_buffer_ctrl_curr
);
6351 /* Re-read these, now that we've installed the
6352 `about_to_request_buffer_space' breakpoint/lock. A thread could
6353 have finished a traceframe between the last read of these
6354 counters and setting the breakpoint above. If we start
6355 uploading, we never want to leave this function with
6356 traceframe_read_count != 0, otherwise, GDBserver could end up
6357 incrementing the counter tokens more than once (due to event loop
6358 nesting), which would break the IP agent's "effective" detection
6359 (see trace_alloc_trace_buffer). */
6360 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6361 &ipa_traceframe_read_count
))
6363 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6364 &ipa_traceframe_write_count
))
6369 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6370 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6371 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6373 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6374 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6375 trace_debug ("note that ipa_traceframe_count's parts changed");
6378 /* Get the address of the current TBC object (the IP agent has an
6379 array of 3 such objects). The index is stored in the TBC
6381 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6382 ipa_trace_buffer_ctrl_addr
6383 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6385 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6386 (unsigned char *) &ipa_trace_buffer_ctrl
,
6387 sizeof (struct ipa_trace_buffer_control
)))
6390 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6391 &ipa_trace_buffer_lo
))
6393 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6394 &ipa_trace_buffer_hi
))
6397 /* Offsets are easier to grok for debugging than raw addresses,
6398 especially for the small trace buffer sizes that are useful for
6400 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6401 "endfree=%d wrap=%d hi=%d",
6403 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6404 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6405 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6406 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6407 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6409 /* Note that the IPA's buffer is always circular. */
6411 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6413 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6414 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6416 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6417 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6418 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6419 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6422 tf
= IPA_FIRST_TRACEFRAME ();
6424 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6426 struct tracepoint
*tpoint
;
6427 struct traceframe
*tframe
;
6428 unsigned char *block
;
6429 struct traceframe ipa_tframe
;
6431 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6432 offsetof (struct traceframe
, data
)))
6433 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6435 if (ipa_tframe
.tpnum
== 0)
6437 internal_error (__FILE__
, __LINE__
,
6438 "Uploading: No (more) fast traceframes, but"
6439 " ipa_traceframe_count == %u??\n",
6440 ipa_traceframe_write_count
6441 - ipa_traceframe_read_count
);
6444 /* Note that this will be incorrect for multi-location
6446 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6448 tframe
= add_traceframe (tpoint
);
6451 trace_buffer_is_full
= 1;
6452 trace_debug ("Uploading: trace buffer is full");
6456 /* Copy the whole set of blocks in one go for now. FIXME:
6457 split this in smaller blocks. */
6458 block
= add_traceframe_block (tframe
, tpoint
,
6459 ipa_tframe
.data_size
);
6462 if (read_inferior_memory (tf
6463 + offsetof (struct traceframe
, data
),
6464 block
, ipa_tframe
.data_size
))
6465 error ("Uploading: Couldn't read traceframe data at %s\n",
6466 paddress (tf
+ offsetof (struct traceframe
, data
)));
6469 trace_debug ("Uploading: traceframe didn't fit");
6470 finish_traceframe (tframe
);
6473 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6475 /* If we freed the traceframe that wrapped around, go back
6476 to the non-wrap case. */
6477 if (tf
< ipa_trace_buffer_ctrl
.start
)
6479 trace_debug ("Lib: Discarding past the wraparound");
6480 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6482 ipa_trace_buffer_ctrl
.start
= tf
;
6483 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6484 ++ipa_traceframe_read_count
;
6486 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6487 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6489 trace_debug ("Lib: buffer is fully empty. "
6490 "Trace buffer [%d] start=%d free=%d endfree=%d",
6492 (int) (ipa_trace_buffer_ctrl
.start
6493 - ipa_trace_buffer_lo
),
6494 (int) (ipa_trace_buffer_ctrl
.free
6495 - ipa_trace_buffer_lo
),
6496 (int) (ipa_trace_buffer_ctrl
.end_free
6497 - ipa_trace_buffer_lo
));
6499 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6500 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6501 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6502 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6505 trace_debug ("Uploaded a traceframe\n"
6506 "Lib: Trace buffer [%d] start=%d free=%d "
6507 "endfree=%d wrap=%d hi=%d",
6509 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6510 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6511 (int) (ipa_trace_buffer_ctrl
.end_free
6512 - ipa_trace_buffer_lo
),
6513 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6514 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6517 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6518 (unsigned char *) &ipa_trace_buffer_ctrl
,
6519 sizeof (struct ipa_trace_buffer_control
)))
6522 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6523 ipa_traceframe_read_count
);
6525 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6529 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6530 about_to_request_buffer_space_bkpt
= NULL
;
6534 if (trace_buffer_is_full
)
6539 #ifdef IN_PROCESS_AGENT
6541 IP_AGENT_EXPORT_VAR
int ust_loaded
;
6542 IP_AGENT_EXPORT_VAR
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6546 /* Static tracepoints. */
6548 /* UST puts a "struct tracepoint" in the global namespace, which
6549 conflicts with our tracepoint. Arguably, being a library, it
6550 shouldn't take ownership of such a generic name. We work around it
6552 #define tracepoint ust_tracepoint
6553 #include <ust/ust.h>
6556 extern int serialize_to_text (char *outbuf
, int bufsize
,
6557 const char *fmt
, va_list ap
);
6559 #define GDB_PROBE_NAME "gdb"
6561 /* We dynamically search for the UST symbols instead of linking them
6562 in. This lets the user decide if the application uses static
6563 tracepoints, instead of always pulling libust.so in. This vector
6564 holds pointers to all functions we care about. */
6568 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6569 const char *fmt
, va_list ap
);
6571 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6572 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6574 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6576 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6579 void (*marker_iter_start
) (struct marker_iter
*iter
);
6580 void (*marker_iter_next
) (struct marker_iter
*iter
);
6581 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6582 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6587 /* Cast through typeof to catch incompatible API changes. Since UST
6588 only builds with gcc, we can freely use gcc extensions here
6590 #define GET_UST_SYM(SYM) \
6593 if (ust_ops.SYM == NULL) \
6594 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6595 if (ust_ops.SYM == NULL) \
6599 #define USTF(SYM) ust_ops.SYM
6601 /* Get pointers to all libust.so functions we care about. */
6606 GET_UST_SYM (serialize_to_text
);
6608 GET_UST_SYM (ltt_probe_register
);
6609 GET_UST_SYM (ltt_probe_unregister
);
6610 GET_UST_SYM (ltt_marker_connect
);
6611 GET_UST_SYM (ltt_marker_disconnect
);
6613 GET_UST_SYM (marker_iter_start
);
6614 GET_UST_SYM (marker_iter_next
);
6615 GET_UST_SYM (marker_iter_stop
);
6616 GET_UST_SYM (marker_iter_reset
);
6622 /* Given an UST marker, return the matching gdb static tracepoint.
6623 The match is done by address. */
6625 static struct tracepoint
*
6626 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6628 struct tracepoint
*tpoint
;
6630 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6632 if (tpoint
->type
!= static_tracepoint
)
6635 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6642 /* The probe function we install on lttng/ust markers. Whenever a
6643 probed ust marker is hit, this function is called. This is similar
6644 to gdb_collect, only for static tracepoints, instead of fast
6648 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6649 struct registers
*regs
, void *call_private
,
6650 const char *fmt
, va_list *args
)
6652 struct tracepoint
*tpoint
;
6653 struct static_tracepoint_ctx ctx
;
6655 /* Don't do anything until the trace run is completely set up. */
6658 trace_debug ("gdb_probe: not tracing\n");
6662 ctx
.base
.type
= static_tracepoint
;
6663 ctx
.regcache_initted
= 0;
6668 /* Wrap the regblock in a register cache (in the stack, we don't
6669 want to malloc here). */
6670 ctx
.regspace
= alloca (ipa_tdesc
->registers_size
);
6671 if (ctx
.regspace
== NULL
)
6673 trace_debug ("Trace buffer block allocation failed, skipping");
6677 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6680 trace_debug ("gdb_probe: marker not known: "
6681 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6682 mdata
->location
, mdata
->channel
,
6683 mdata
->name
, mdata
->format
);
6687 if (!tpoint
->enabled
)
6689 trace_debug ("gdb_probe: tracepoint disabled");
6693 ctx
.tpoint
= tpoint
;
6695 trace_debug ("gdb_probe: collecting marker: "
6696 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6697 mdata
->location
, mdata
->channel
,
6698 mdata
->name
, mdata
->format
);
6700 /* Test the condition if present, and collect if true. */
6701 if (tpoint
->cond
== NULL
6702 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6705 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6706 tpoint
->address
, tpoint
);
6708 if (stopping_tracepoint
6709 || trace_buffer_is_full
6710 || expr_eval_result
!= expr_eval_no_error
)
6715 /* If there was a condition and it evaluated to false, the only
6716 way we would stop tracing is if there was an error during
6717 condition expression evaluation. */
6718 if (expr_eval_result
!= expr_eval_no_error
)
6723 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6724 static tracepoint string data. This is a string passed to the
6725 tracing library by the user, at the time of the tracepoint marker
6726 call. E.g., in the UST marker call:
6728 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6730 the collected data is "str FOOBAZ".
6734 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6735 struct traceframe
*tframe
)
6737 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6738 unsigned char *bufspace
;
6741 unsigned short blocklen
;
6745 trace_debug ("Wanted to collect static trace data, "
6746 "but there's no static trace data");
6750 va_copy (copy
, *umd
->args
);
6751 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6754 trace_debug ("Want to collect ust data");
6756 /* 'S' + size + string */
6757 bufspace
= add_traceframe_block (tframe
, umd
->tpoint
,
6758 1 + sizeof (blocklen
) + size
+ 1);
6759 if (bufspace
== NULL
)
6761 trace_debug ("Trace buffer block allocation failed, skipping");
6765 /* Identify a static trace data block. */
6768 blocklen
= size
+ 1;
6769 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6771 va_copy (copy
, *umd
->args
);
6772 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6773 size
+ 1, umd
->fmt
, copy
);
6776 trace_debug ("Storing static tracepoint data in regblock: %s",
6777 bufspace
+ 1 + sizeof (blocklen
));
6780 /* The probe to register with lttng/ust. */
6781 static struct ltt_available_probe gdb_ust_probe
=
6788 #endif /* HAVE_UST */
6789 #endif /* IN_PROCESS_AGENT */
6791 #ifndef IN_PROCESS_AGENT
6793 /* Ask the in-process agent to run a command. Since we don't want to
6794 have to handle the IPA hitting breakpoints while running the
6795 command, we pause all threads, remove all breakpoints, and then set
6796 the helper thread re-running. We communicate with the helper
6797 thread by means of direct memory xfering, and a socket for
6801 run_inferior_command (char *cmd
, int len
)
6804 int pid
= ptid_get_pid (current_ptid
);
6806 trace_debug ("run_inferior_command: running: %s", cmd
);
6809 uninsert_all_breakpoints ();
6811 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6813 reinsert_all_breakpoints ();
6819 #else /* !IN_PROCESS_AGENT */
6821 #include <sys/socket.h>
6824 #ifndef UNIX_PATH_MAX
6825 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6828 /* Where we put the socked used for synchronization. */
6829 #define SOCK_DIR P_tmpdir
6831 /* Thread ID of the helper thread. GDBserver reads this to know which
6832 is the help thread. This is an LWP id on Linux. */
6834 IP_AGENT_EXPORT_VAR
int helper_thread_id
;
6838 init_named_socket (const char *name
)
6841 struct sockaddr_un addr
;
6843 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6846 warning ("socket creation failed: %s", strerror (errno
));
6850 addr
.sun_family
= AF_UNIX
;
6852 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6853 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6855 result
= access (name
, F_OK
);
6859 result
= unlink (name
);
6862 warning ("unlink failed: %s", strerror (errno
));
6866 warning ("socket %s already exists; overwriting", name
);
6869 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6872 warning ("bind failed: %s", strerror (errno
));
6877 result
= listen (fd
, 1);
6880 warning ("listen: %s", strerror (errno
));
6888 static char agent_socket_name
[UNIX_PATH_MAX
];
6891 gdb_agent_socket_init (void)
6895 result
= xsnprintf (agent_socket_name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6896 SOCK_DIR
, getpid ());
6897 if (result
>= UNIX_PATH_MAX
)
6899 trace_debug ("string overflow allocating socket name");
6903 fd
= init_named_socket (agent_socket_name
);
6905 warning ("Error initializing named socket (%s) for communication with the "
6906 "ust helper thread. Check that directory exists and that it "
6907 "is writable.", agent_socket_name
);
6914 /* The next marker to be returned on a qTsSTM command. */
6915 static const struct marker
*next_st
;
6917 /* Returns the first known marker. */
6922 struct marker_iter iter
;
6924 USTF(marker_iter_reset
) (&iter
);
6925 USTF(marker_iter_start
) (&iter
);
6930 /* Returns the marker following M. */
6932 const struct marker
*
6933 next_marker (const struct marker
*m
)
6935 struct marker_iter iter
;
6937 USTF(marker_iter_reset
) (&iter
);
6938 USTF(marker_iter_start
) (&iter
);
6940 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6942 if (iter
.marker
== m
)
6944 USTF(marker_iter_next
) (&iter
);
6952 /* Return an hexstr version of the STR C string, fit for sending to
6956 cstr_to_hexstr (const char *str
)
6958 int len
= strlen (str
);
6959 char *hexstr
= xmalloc (len
* 2 + 1);
6960 bin2hex ((gdb_byte
*) str
, hexstr
, len
);
6964 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6968 response_ust_marker (char *packet
, const struct marker
*st
)
6970 char *strid
, *format
, *tmp
;
6972 next_st
= next_marker (st
);
6974 tmp
= xmalloc (strlen (st
->channel
) + 1 +
6975 strlen (st
->name
) + 1);
6976 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
6978 strid
= cstr_to_hexstr (tmp
);
6981 format
= cstr_to_hexstr (st
->format
);
6983 sprintf (packet
, "m%s:%s:%s",
6984 paddress ((uintptr_t) st
->location
),
6992 /* Return the first static tracepoint, and initialize the state
6993 machine that will iterate through all the static tracepoints. */
6996 cmd_qtfstm (char *packet
)
6998 trace_debug ("Returning first trace state variable definition");
7000 if (first_marker ())
7001 response_ust_marker (packet
, first_marker ());
7003 strcpy (packet
, "l");
7006 /* Return additional trace state variable definitions. */
7009 cmd_qtsstm (char *packet
)
7011 trace_debug ("Returning static tracepoint");
7014 response_ust_marker (packet
, next_st
);
7016 strcpy (packet
, "l");
7019 /* Disconnect the GDB probe from a marker at a given address. */
7022 unprobe_marker_at (char *packet
)
7026 struct marker_iter iter
;
7028 p
+= sizeof ("unprobe_marker_at:") - 1;
7030 p
= unpack_varlen_hex (p
, &address
);
7032 USTF(marker_iter_reset
) (&iter
);
7033 USTF(marker_iter_start
) (&iter
);
7034 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
7035 if ((uintptr_t ) iter
.marker
->location
== address
)
7039 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
7043 warning ("could not disable marker %s/%s",
7044 iter
.marker
->channel
, iter
.marker
->name
);
7049 /* Connect the GDB probe to a marker at a given address. */
7052 probe_marker_at (char *packet
)
7056 struct marker_iter iter
;
7059 p
+= sizeof ("probe_marker_at:") - 1;
7061 p
= unpack_varlen_hex (p
, &address
);
7063 USTF(marker_iter_reset
) (&iter
);
7065 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7067 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7068 if ((uintptr_t ) m
->location
== address
)
7072 trace_debug ("found marker for address. "
7073 "ltt_marker_connect (marker = %s/%s)",
7074 m
->channel
, m
->name
);
7076 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
7078 if (result
&& result
!= -EEXIST
)
7079 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
7080 m
->channel
, m
->name
, -result
);
7084 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
7085 m
->channel
, m
->name
);
7089 strcpy (packet
, "OK");
7093 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
7098 cmd_qtstmat (char *packet
)
7102 struct marker_iter iter
;
7105 p
+= sizeof ("qTSTMat:") - 1;
7107 p
= unpack_varlen_hex (p
, &address
);
7109 USTF(marker_iter_reset
) (&iter
);
7111 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7113 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7114 if ((uintptr_t ) m
->location
== address
)
7116 response_ust_marker (packet
, m
);
7120 strcpy (packet
, "l");
7130 USTF(ltt_probe_register
) (&gdb_ust_probe
);
7133 #endif /* HAVE_UST */
7135 #include <sys/syscall.h>
7138 gdb_agent_remove_socket (void)
7140 unlink (agent_socket_name
);
7143 /* Helper thread of agent. */
7146 gdb_agent_helper_thread (void *arg
)
7150 atexit (gdb_agent_remove_socket
);
7154 listen_fd
= gdb_agent_socket_init ();
7156 if (helper_thread_id
== 0)
7157 helper_thread_id
= syscall (SYS_gettid
);
7159 if (listen_fd
== -1)
7161 warning ("could not create sync socket\n");
7168 struct sockaddr_un sockaddr
;
7174 tmp
= sizeof (sockaddr
);
7178 fd
= accept (listen_fd
, (struct sockaddr
*) &sockaddr
, &tmp
);
7180 /* It seems an ERESTARTSYS can escape out of accept. */
7181 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7185 warning ("Accept returned %d, error: %s\n",
7186 fd
, strerror (errno
));
7192 ret
= read (fd
, buf
, 1);
7193 } while (ret
== -1 && errno
== EINTR
);
7197 warning ("reading socket (fd=%d) failed with %s",
7198 fd
, strerror (errno
));
7205 if (startswith (cmd_buf
, "close"))
7210 else if (strcmp ("qTfSTM", cmd_buf
) == 0)
7212 cmd_qtfstm (cmd_buf
);
7214 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7216 cmd_qtsstm (cmd_buf
);
7218 else if (startswith (cmd_buf
, "unprobe_marker_at:"))
7220 unprobe_marker_at (cmd_buf
);
7222 else if (startswith (cmd_buf
, "probe_marker_at:"))
7224 probe_marker_at (cmd_buf
);
7226 else if (startswith (cmd_buf
, "qTSTMat:"))
7228 cmd_qtstmat (cmd_buf
);
7230 #endif /* HAVE_UST */
7233 /* Fix compiler's warning: ignoring return value of 'write'. */
7234 ret
= write (fd
, buf
, 1);
7240 unlink (agent_socket_name
);
7242 /* Sleep endlessly to wait the whole inferior stops. This
7243 thread can not exit because GDB or GDBserver may still need
7244 'current_thread' (representing this thread) to access
7245 inferior memory. Otherwise, this thread exits earlier than
7246 other threads, and 'current_thread' is set to NULL. */
7257 #include <pthread.h>
7260 IP_AGENT_EXPORT_VAR
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7264 gdb_agent_init (void)
7271 /* We want the helper thread to be as transparent as possible, so
7272 have it inherit an all-signals-blocked mask. */
7274 sigfillset (&new_mask
);
7275 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7277 perror_with_name ("pthread_sigmask (1)");
7279 res
= pthread_create (&thread
,
7281 gdb_agent_helper_thread
,
7284 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7286 perror_with_name ("pthread_sigmask (2)");
7288 while (helper_thread_id
== 0)
7296 #include <sys/mman.h>
7299 IP_AGENT_EXPORT_VAR
char *gdb_tp_heap_buffer
;
7300 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer
;
7301 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer_end
;
7302 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer
;
7303 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_end
;
7304 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_error
;
7306 /* Record the result of getting buffer space for fast tracepoint
7307 trampolines. Any error message is copied, since caller may not be
7308 using persistent storage. */
7311 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7313 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7314 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7316 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7318 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7321 static void __attribute__ ((constructor
))
7322 initialize_tracepoint_ftlib (void)
7324 initialize_tracepoint ();
7329 #endif /* IN_PROCESS_AGENT */
7331 /* Return a timestamp, expressed as microseconds of the usual Unix
7332 time. (As the result is a 64-bit number, it will not overflow any
7336 get_timestamp (void)
7340 if (gettimeofday (&tv
, 0) != 0)
7343 return (LONGEST
) tv
.tv_sec
* 1000000 + tv
.tv_usec
;
7347 initialize_tracepoint (void)
7349 /* Start with the default size. */
7350 init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE
);
7352 /* Wire trace state variable 1 to be the timestamp. This will be
7353 uploaded to GDB upon connection and become one of its trace state
7354 variables. (In case you're wondering, if GDB already has a trace
7355 variable numbered 1, it will be renumbered.) */
7356 create_trace_state_variable (1, 0);
7357 set_trace_state_variable_name (1, "trace_timestamp");
7358 set_trace_state_variable_getter (1, get_timestamp
);
7360 #ifdef IN_PROCESS_AGENT
7365 pagesize
= sysconf (_SC_PAGE_SIZE
);
7367 perror_with_name ("sysconf");
7369 gdb_tp_heap_buffer
= xmalloc (5 * 1024 * 1024);
7371 #define SCRATCH_BUFFER_NPAGES 20
7373 /* Allocate scratch buffer aligned on a page boundary, at a low
7374 address (close to the main executable's code). */
7375 for (addr
= pagesize
; addr
!= 0; addr
+= pagesize
)
7377 gdb_jump_pad_buffer
= mmap ((void *) addr
, pagesize
* SCRATCH_BUFFER_NPAGES
,
7378 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
7379 MAP_PRIVATE
| MAP_ANONYMOUS
| MAP_FIXED
,
7381 if (gdb_jump_pad_buffer
!= MAP_FAILED
)
7386 perror_with_name ("mmap");
7388 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ pagesize
* SCRATCH_BUFFER_NPAGES
;
7391 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7393 /* It's not a fatal error for something to go wrong with trampoline
7394 buffer setup, but it can be mysterious, so create a channel to
7395 report back on what went wrong, using a fixed size since we may
7396 not be able to allocate space later when the problem occurs. */
7397 gdb_trampoline_buffer_error
= xmalloc (IPA_BUFSIZ
);
7399 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7401 initialize_low_tracepoint ();