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
) (unsigned char *,
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
= XNEW (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
=
1942 XNEW (struct collect_memory_action
);
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
=
1970 XNEW (struct collect_registers_action
);
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
=
1986 XNEW (struct collect_static_trace_data_action
);
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
= XNEW (struct eval_expr_action
);
2004 xaction
->base
.type
= *act
;
2005 xaction
->base
.ops
= &x_tracepoint_action_ops
;
2006 action
= &xaction
->base
;
2008 trace_debug ("Want to evaluate expression");
2009 xaction
->expr
= gdb_parse_agent_expr (&act
);
2013 trace_debug ("unknown trace action '%c', ignoring...", *act
);
2022 if (seen_step_action_flag
)
2024 tpoint
->num_step_actions
++;
2026 tpoint
->step_actions
2027 = xrealloc (tpoint
->step_actions
,
2028 (sizeof (*tpoint
->step_actions
)
2029 * tpoint
->num_step_actions
));
2030 tpoint
->step_actions_str
2031 = xrealloc (tpoint
->step_actions_str
,
2032 (sizeof (*tpoint
->step_actions_str
)
2033 * tpoint
->num_step_actions
));
2034 tpoint
->step_actions
[tpoint
->num_step_actions
- 1] = action
;
2035 tpoint
->step_actions_str
[tpoint
->num_step_actions
- 1]
2036 = savestring (act_start
, act
- act_start
);
2040 tpoint
->numactions
++;
2042 = xrealloc (tpoint
->actions
,
2043 sizeof (*tpoint
->actions
) * tpoint
->numactions
);
2045 = xrealloc (tpoint
->actions_str
,
2046 sizeof (*tpoint
->actions_str
) * tpoint
->numactions
);
2047 tpoint
->actions
[tpoint
->numactions
- 1] = action
;
2048 tpoint
->actions_str
[tpoint
->numactions
- 1]
2049 = savestring (act_start
, act
- act_start
);
2056 /* Find or create a trace state variable with the given number. */
2058 static struct trace_state_variable
*
2059 get_trace_state_variable (int num
)
2061 struct trace_state_variable
*tsv
;
2063 #ifdef IN_PROCESS_AGENT
2064 /* Search for an existing variable. */
2065 for (tsv
= alloced_trace_state_variables
; tsv
; tsv
= tsv
->next
)
2066 if (tsv
->number
== num
)
2070 /* Search for an existing variable. */
2071 for (tsv
= trace_state_variables
; tsv
; tsv
= tsv
->next
)
2072 if (tsv
->number
== num
)
2078 /* Find or create a trace state variable with the given number. */
2080 static struct trace_state_variable
*
2081 create_trace_state_variable (int num
, int gdb
)
2083 struct trace_state_variable
*tsv
;
2085 tsv
= get_trace_state_variable (num
);
2089 /* Create a new variable. */
2090 tsv
= XNEW (struct trace_state_variable
);
2092 tsv
->initial_value
= 0;
2096 #ifdef IN_PROCESS_AGENT
2099 tsv
->next
= alloced_trace_state_variables
;
2100 alloced_trace_state_variables
= tsv
;
2105 tsv
->next
= trace_state_variables
;
2106 trace_state_variables
= tsv
;
2111 IP_AGENT_EXPORT_FUNC LONGEST
2112 get_trace_state_variable_value (int num
)
2114 struct trace_state_variable
*tsv
;
2116 tsv
= get_trace_state_variable (num
);
2120 trace_debug ("No trace state variable %d, skipping value get", num
);
2124 /* Call a getter function if we have one. While it's tempting to
2125 set up something to only call the getter once per tracepoint hit,
2126 it could run afoul of thread races. Better to let the getter
2127 handle it directly, if necessary to worry about it. */
2129 tsv
->value
= (tsv
->getter
) ();
2131 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2132 num
, plongest (tsv
->value
));
2137 IP_AGENT_EXPORT_FUNC
void
2138 set_trace_state_variable_value (int num
, LONGEST val
)
2140 struct trace_state_variable
*tsv
;
2142 tsv
= get_trace_state_variable (num
);
2146 trace_debug ("No trace state variable %d, skipping value set", num
);
2154 agent_get_trace_state_variable_value (int num
)
2156 return get_trace_state_variable_value (num
);
2160 agent_set_trace_state_variable_value (int num
, LONGEST val
)
2162 set_trace_state_variable_value (num
, val
);
2166 set_trace_state_variable_name (int num
, const char *name
)
2168 struct trace_state_variable
*tsv
;
2170 tsv
= get_trace_state_variable (num
);
2174 trace_debug ("No trace state variable %d, skipping name set", num
);
2178 tsv
->name
= (char *) name
;
2182 set_trace_state_variable_getter (int num
, LONGEST (*getter
) (void))
2184 struct trace_state_variable
*tsv
;
2186 tsv
= get_trace_state_variable (num
);
2190 trace_debug ("No trace state variable %d, skipping getter set", num
);
2194 tsv
->getter
= getter
;
2197 /* Add a raw traceframe for the given tracepoint. */
2199 static struct traceframe
*
2200 add_traceframe (struct tracepoint
*tpoint
)
2202 struct traceframe
*tframe
;
2204 tframe
= trace_buffer_alloc (sizeof (struct traceframe
));
2209 tframe
->tpnum
= tpoint
->number
;
2210 tframe
->data_size
= 0;
2215 /* Add a block to the traceframe currently being worked on. */
2217 static unsigned char *
2218 add_traceframe_block (struct traceframe
*tframe
,
2219 struct tracepoint
*tpoint
, int amt
)
2221 unsigned char *block
;
2226 block
= trace_buffer_alloc (amt
);
2231 gdb_assert (tframe
->tpnum
== tpoint
->number
);
2233 tframe
->data_size
+= amt
;
2234 tpoint
->traceframe_usage
+= amt
;
2239 /* Flag that the current traceframe is finished. */
2242 finish_traceframe (struct traceframe
*tframe
)
2244 ++traceframe_write_count
;
2245 ++traceframes_created
;
2248 #ifndef IN_PROCESS_AGENT
2250 /* Given a traceframe number NUM, find the NUMth traceframe in the
2253 static struct traceframe
*
2254 find_traceframe (int num
)
2256 struct traceframe
*tframe
;
2259 for (tframe
= FIRST_TRACEFRAME ();
2261 tframe
= NEXT_TRACEFRAME (tframe
))
2272 get_traceframe_address (struct traceframe
*tframe
)
2275 struct tracepoint
*tpoint
;
2277 addr
= traceframe_get_pc (tframe
);
2282 /* Fallback strategy, will be incorrect for while-stepping frames
2283 and multi-location tracepoints. */
2284 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
2285 return tpoint
->address
;
2288 /* Search for the next traceframe whose address is inside or outside
2291 static struct traceframe
*
2292 find_next_traceframe_in_range (CORE_ADDR lo
, CORE_ADDR hi
, int inside_p
,
2295 struct traceframe
*tframe
;
2298 *tfnump
= current_traceframe
+ 1;
2299 tframe
= find_traceframe (*tfnump
);
2300 /* The search is not supposed to wrap around. */
2307 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2309 tfaddr
= get_traceframe_address (tframe
);
2311 ? (lo
<= tfaddr
&& tfaddr
<= hi
)
2312 : (lo
> tfaddr
|| tfaddr
> hi
))
2321 /* Search for the next traceframe recorded by the given tracepoint.
2322 Note that for multi-location tracepoints, this will find whatever
2323 location appears first. */
2325 static struct traceframe
*
2326 find_next_traceframe_by_tracepoint (int num
, int *tfnump
)
2328 struct traceframe
*tframe
;
2330 *tfnump
= current_traceframe
+ 1;
2331 tframe
= find_traceframe (*tfnump
);
2332 /* The search is not supposed to wrap around. */
2339 for (; tframe
->tpnum
!= 0; tframe
= NEXT_TRACEFRAME (tframe
))
2341 if (tframe
->tpnum
== num
)
2352 #ifndef IN_PROCESS_AGENT
2354 /* Clear all past trace state. */
2357 cmd_qtinit (char *packet
)
2359 struct trace_state_variable
*tsv
, *prev
, *next
;
2361 /* Can't do this command without a pid attached. */
2362 if (current_thread
== NULL
)
2368 /* Make sure we don't try to read from a trace frame. */
2369 current_traceframe
= -1;
2373 trace_debug ("Initializing the trace");
2375 clear_installed_tracepoints ();
2376 clear_readonly_regions ();
2379 last_tracepoint
= NULL
;
2381 /* Clear out any leftover trace state variables. Ones with target
2382 defined getters should be kept however. */
2384 tsv
= trace_state_variables
;
2387 trace_debug ("Looking at var %d", tsv
->number
);
2388 if (tsv
->getter
== NULL
)
2394 trace_state_variables
= next
;
2395 trace_debug ("Deleting var %d", tsv
->number
);
2406 clear_trace_buffer ();
2407 clear_inferior_trace_buffer ();
2412 /* Unprobe the UST marker at ADDRESS. */
2415 unprobe_marker_at (CORE_ADDR address
)
2417 char cmd
[IPA_CMD_BUF_SIZE
];
2419 sprintf (cmd
, "unprobe_marker_at:%s", paddress (address
));
2420 run_inferior_command (cmd
, strlen (cmd
) + 1);
2423 /* Restore the program to its pre-tracing state. This routine may be called
2424 in error situations, so it needs to be careful about only restoring
2425 from known-valid bits. */
2428 clear_installed_tracepoints (void)
2430 struct tracepoint
*tpoint
;
2431 struct tracepoint
*prev_stpoint
;
2435 prev_stpoint
= NULL
;
2437 /* Restore any bytes overwritten by tracepoints. */
2438 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
2440 /* Catch the case where we might try to remove a tracepoint that
2441 was never actually installed. */
2442 if (tpoint
->handle
== NULL
)
2444 trace_debug ("Tracepoint %d at 0x%s was "
2445 "never installed, nothing to clear",
2446 tpoint
->number
, paddress (tpoint
->address
));
2450 switch (tpoint
->type
)
2452 case trap_tracepoint
:
2453 delete_breakpoint (tpoint
->handle
);
2455 case fast_tracepoint
:
2456 delete_fast_tracepoint_jump (tpoint
->handle
);
2458 case static_tracepoint
:
2459 if (prev_stpoint
!= NULL
2460 && prev_stpoint
->address
== tpoint
->address
)
2461 /* Nothing to do. We already unprobed a tracepoint set at
2462 this marker address (and there can only be one probe
2467 unprobe_marker_at (tpoint
->address
);
2468 prev_stpoint
= tpoint
;
2473 tpoint
->handle
= NULL
;
2479 /* Parse a packet that defines a tracepoint. */
2482 cmd_qtdp (char *own_buf
)
2485 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2486 int trail_hyphen
= 0;
2490 struct tracepoint
*tpoint
;
2492 char *packet
= own_buf
;
2494 packet
+= strlen ("QTDP:");
2496 /* A hyphen at the beginning marks a packet specifying actions for a
2497 tracepoint already supplied. */
2504 packet
= unpack_varlen_hex (packet
, &num
);
2505 ++packet
; /* skip a colon */
2506 packet
= unpack_varlen_hex (packet
, &addr
);
2507 ++packet
; /* skip a colon */
2509 /* See if we already have this tracepoint. */
2510 tpoint
= find_tracepoint (num
, addr
);
2514 /* Duplicate tracepoints are never allowed. */
2517 trace_debug ("Tracepoint error: tracepoint %d"
2518 " at 0x%s already exists",
2519 (int) num
, paddress (addr
));
2520 write_enn (own_buf
);
2524 tpoint
= add_tracepoint (num
, addr
);
2526 tpoint
->enabled
= (*packet
== 'E');
2527 ++packet
; /* skip 'E' */
2528 ++packet
; /* skip a colon */
2529 packet
= unpack_varlen_hex (packet
, &count
);
2530 tpoint
->step_count
= count
;
2531 ++packet
; /* skip a colon */
2532 packet
= unpack_varlen_hex (packet
, &count
);
2533 tpoint
->pass_count
= count
;
2534 /* See if we have any of the additional optional fields. */
2535 while (*packet
== ':')
2540 tpoint
->type
= fast_tracepoint
;
2542 packet
= unpack_varlen_hex (packet
, &count
);
2543 tpoint
->orig_size
= count
;
2545 else if (*packet
== 'S')
2547 tpoint
->type
= static_tracepoint
;
2550 else if (*packet
== 'X')
2552 actparm
= (char *) packet
;
2553 tpoint
->cond
= gdb_parse_agent_expr (&actparm
);
2556 else if (*packet
== '-')
2558 else if (*packet
== '\0')
2561 trace_debug ("Unknown optional tracepoint field");
2566 trace_debug ("Also has actions\n");
2569 trace_debug ("Defined %stracepoint %d at 0x%s, "
2570 "enabled %d step %" PRIu64
" pass %" PRIu64
,
2571 tpoint
->type
== fast_tracepoint
? "fast "
2572 : tpoint
->type
== static_tracepoint
? "static " : "",
2573 tpoint
->number
, paddress (tpoint
->address
), tpoint
->enabled
,
2574 tpoint
->step_count
, tpoint
->pass_count
);
2577 add_tracepoint_action (tpoint
, packet
);
2580 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2581 (int) num
, paddress (addr
));
2582 write_enn (own_buf
);
2586 /* Install tracepoint during tracing only once for each tracepoint location.
2587 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2588 determine the last QTDP packet for one tracepoint location by checking
2589 trailing hyphen in QTDP packet. */
2590 if (tracing
&& !trail_hyphen
)
2592 struct tracepoint
*tp
= NULL
;
2594 /* Pause all threads temporarily while we patch tracepoints. */
2597 /* download_tracepoint will update global `tracepoints'
2598 list, so it is unsafe to leave threads in jump pad. */
2599 stabilize_threads ();
2601 /* Freeze threads. */
2605 if (tpoint
->type
!= trap_tracepoint
)
2607 /* Find another fast or static tracepoint at the same address. */
2608 for (tp
= tracepoints
; tp
; tp
= tp
->next
)
2610 if (tp
->address
== tpoint
->address
&& tp
->type
== tpoint
->type
2611 && tp
->number
!= tpoint
->number
)
2615 /* TPOINT is installed at the same address as TP. */
2618 if (tpoint
->type
== fast_tracepoint
)
2619 clone_fast_tracepoint (tpoint
, tp
);
2620 else if (tpoint
->type
== static_tracepoint
)
2621 tpoint
->handle
= (void *) -1;
2625 if (use_agent
&& tpoint
->type
== fast_tracepoint
2626 && agent_capability_check (AGENT_CAPA_FAST_TRACE
))
2628 /* Download and install fast tracepoint by agent. */
2629 if (tracepoint_send_agent (tpoint
) == 0)
2633 write_enn (own_buf
);
2634 remove_tracepoint (tpoint
);
2639 download_tracepoint (tpoint
);
2641 if (tpoint
->type
== trap_tracepoint
|| tp
== NULL
)
2643 install_tracepoint (tpoint
, own_buf
);
2644 if (strcmp (own_buf
, "OK") != 0)
2645 remove_tracepoint (tpoint
);
2659 cmd_qtdpsrc (char *own_buf
)
2661 ULONGEST num
, addr
, start
, slen
;
2662 struct tracepoint
*tpoint
;
2663 char *packet
= own_buf
;
2664 char *saved
, *srctype
, *src
;
2666 struct source_string
*last
, *newlast
;
2668 packet
+= strlen ("QTDPsrc:");
2670 packet
= unpack_varlen_hex (packet
, &num
);
2671 ++packet
; /* skip a colon */
2672 packet
= unpack_varlen_hex (packet
, &addr
);
2673 ++packet
; /* skip a colon */
2675 /* See if we already have this tracepoint. */
2676 tpoint
= find_tracepoint (num
, addr
);
2680 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2681 (int) num
, paddress (addr
));
2682 write_enn (own_buf
);
2687 packet
= strchr (packet
, ':');
2688 srctype
= xmalloc (packet
- saved
+ 1);
2689 memcpy (srctype
, saved
, packet
- saved
);
2690 srctype
[packet
- saved
] = '\0';
2692 packet
= unpack_varlen_hex (packet
, &start
);
2693 ++packet
; /* skip a colon */
2694 packet
= unpack_varlen_hex (packet
, &slen
);
2695 ++packet
; /* skip a colon */
2696 src
= xmalloc (slen
+ 1);
2697 nbytes
= hex2bin (packet
, (gdb_byte
*) src
, strlen (packet
) / 2);
2700 newlast
= XNEW (struct source_string
);
2701 newlast
->type
= srctype
;
2703 newlast
->next
= NULL
;
2704 /* Always add a source string to the end of the list;
2705 this keeps sequences of actions/commands in the right
2707 if (tpoint
->source_strings
)
2709 for (last
= tpoint
->source_strings
; last
->next
; last
= last
->next
)
2711 last
->next
= newlast
;
2714 tpoint
->source_strings
= newlast
;
2720 cmd_qtdv (char *own_buf
)
2722 ULONGEST num
, val
, builtin
;
2725 struct trace_state_variable
*tsv
;
2726 char *packet
= own_buf
;
2728 packet
+= strlen ("QTDV:");
2730 packet
= unpack_varlen_hex (packet
, &num
);
2731 ++packet
; /* skip a colon */
2732 packet
= unpack_varlen_hex (packet
, &val
);
2733 ++packet
; /* skip a colon */
2734 packet
= unpack_varlen_hex (packet
, &builtin
);
2735 ++packet
; /* skip a colon */
2737 nbytes
= strlen (packet
) / 2;
2738 varname
= xmalloc (nbytes
+ 1);
2739 nbytes
= hex2bin (packet
, (gdb_byte
*) varname
, nbytes
);
2740 varname
[nbytes
] = '\0';
2742 tsv
= create_trace_state_variable (num
, 1);
2743 tsv
->initial_value
= (LONGEST
) val
;
2744 tsv
->name
= varname
;
2746 set_trace_state_variable_value (num
, (LONGEST
) val
);
2752 cmd_qtenable_disable (char *own_buf
, int enable
)
2754 char *packet
= own_buf
;
2756 struct tracepoint
*tp
;
2758 packet
+= strlen (enable
? "QTEnable:" : "QTDisable:");
2759 packet
= unpack_varlen_hex (packet
, &num
);
2760 ++packet
; /* skip a colon */
2761 packet
= unpack_varlen_hex (packet
, &addr
);
2763 tp
= find_tracepoint (num
, addr
);
2767 if ((enable
&& tp
->enabled
) || (!enable
&& !tp
->enabled
))
2769 trace_debug ("Tracepoint %d at 0x%s is already %s",
2770 (int) num
, paddress (addr
),
2771 enable
? "enabled" : "disabled");
2776 trace_debug ("%s tracepoint %d at 0x%s",
2777 enable
? "Enabling" : "Disabling",
2778 (int) num
, paddress (addr
));
2780 tp
->enabled
= enable
;
2782 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
2785 int offset
= offsetof (struct tracepoint
, enabled
);
2786 CORE_ADDR obj_addr
= tp
->obj_addr_on_target
+ offset
;
2788 ret
= prepare_to_access_memory ();
2791 trace_debug ("Failed to temporarily stop inferior threads");
2792 write_enn (own_buf
);
2796 ret
= write_inferior_integer (obj_addr
, enable
);
2797 done_accessing_memory ();
2801 trace_debug ("Cannot write enabled flag into "
2802 "inferior process memory");
2803 write_enn (own_buf
);
2812 trace_debug ("Tracepoint %d at 0x%s not found",
2813 (int) num
, paddress (addr
));
2814 write_enn (own_buf
);
2819 cmd_qtv (char *own_buf
)
2824 char *packet
= own_buf
;
2826 packet
+= strlen ("qTV:");
2827 unpack_varlen_hex (packet
, &num
);
2829 if (current_traceframe
>= 0)
2831 err
= traceframe_read_tsv ((int) num
, &val
);
2834 strcpy (own_buf
, "U");
2838 /* Only make tsv's be undefined before the first trace run. After a
2839 trace run is over, the user might want to see the last value of
2840 the tsv, and it might not be available in a traceframe. */
2841 else if (!tracing
&& strcmp (tracing_stop_reason
, "tnotrun") == 0)
2843 strcpy (own_buf
, "U");
2847 val
= get_trace_state_variable_value (num
);
2849 sprintf (own_buf
, "V%s", phex_nz (val
, 0));
2852 /* Clear out the list of readonly regions. */
2855 clear_readonly_regions (void)
2857 struct readonly_region
*roreg
;
2859 while (readonly_regions
)
2861 roreg
= readonly_regions
;
2862 readonly_regions
= readonly_regions
->next
;
2867 /* Parse the collection of address ranges whose contents GDB believes
2868 to be unchanging and so can be read directly from target memory
2869 even while looking at a traceframe. */
2872 cmd_qtro (char *own_buf
)
2874 ULONGEST start
, end
;
2875 struct readonly_region
*roreg
;
2876 char *packet
= own_buf
;
2878 trace_debug ("Want to mark readonly regions");
2880 clear_readonly_regions ();
2882 packet
+= strlen ("QTro");
2884 while (*packet
== ':')
2886 ++packet
; /* skip a colon */
2887 packet
= unpack_varlen_hex (packet
, &start
);
2888 ++packet
; /* skip a comma */
2889 packet
= unpack_varlen_hex (packet
, &end
);
2891 roreg
= XNEW (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 static CORE_ADDR gdb_jump_pad_head
;
2921 /* Return the address of the next free jump space. */
2924 get_jump_space_head (void)
2926 if (gdb_jump_pad_head
== 0)
2928 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
2929 &gdb_jump_pad_head
))
2931 internal_error (__FILE__
, __LINE__
,
2932 "error extracting jump_pad_buffer");
2936 return gdb_jump_pad_head
;
2939 /* Reserve USED bytes from the jump space. */
2942 claim_jump_space (ULONGEST used
)
2944 trace_debug ("claim_jump_space reserves %s bytes at %s",
2945 pulongest (used
), paddress (gdb_jump_pad_head
));
2946 gdb_jump_pad_head
+= used
;
2949 static CORE_ADDR trampoline_buffer_head
= 0;
2950 static CORE_ADDR trampoline_buffer_tail
;
2952 /* Reserve USED bytes from the trampoline buffer and return the
2953 address of the start of the reserved space in TRAMPOLINE. Returns
2954 non-zero if the space is successfully claimed. */
2957 claim_trampoline_space (ULONGEST used
, CORE_ADDR
*trampoline
)
2959 if (!trampoline_buffer_head
)
2961 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
2962 &trampoline_buffer_tail
))
2964 internal_error (__FILE__
, __LINE__
,
2965 "error extracting trampoline_buffer");
2968 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
2969 &trampoline_buffer_head
))
2971 internal_error (__FILE__
, __LINE__
,
2972 "error extracting trampoline_buffer_end");
2976 /* Start claiming space from the top of the trampoline space. If
2977 the space is located at the bottom of the virtual address space,
2978 this reduces the possibility that corruption will occur if a null
2979 pointer is used to write to memory. */
2980 if (trampoline_buffer_head
- trampoline_buffer_tail
< used
)
2982 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2987 trampoline_buffer_head
-= used
;
2989 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2990 pulongest (used
), paddress (trampoline_buffer_head
));
2992 *trampoline
= trampoline_buffer_head
;
2996 /* Returns non-zero if there is space allocated for use in trampolines
2997 for fast tracepoints. */
3000 have_fast_tracepoint_trampoline_buffer (char *buf
)
3002 CORE_ADDR trampoline_end
, errbuf
;
3004 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
3007 internal_error (__FILE__
, __LINE__
,
3008 "error extracting trampoline_buffer_end");
3014 strcpy (buf
, "was claiming");
3015 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_error
,
3018 internal_error (__FILE__
, __LINE__
,
3019 "error extracting errbuf");
3022 read_inferior_memory (errbuf
, (unsigned char *) buf
, 100);
3025 return trampoline_end
!= 0;
3028 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3029 the command fails, or 0 otherwise. If the command ran
3030 successfully, but probing the marker failed, ERROUT will be filled
3031 with the error to reply to GDB, and -1 is also returned. This
3032 allows directly passing IPA errors to GDB. */
3035 probe_marker_at (CORE_ADDR address
, char *errout
)
3037 char cmd
[IPA_CMD_BUF_SIZE
];
3040 sprintf (cmd
, "probe_marker_at:%s", paddress (address
));
3041 err
= run_inferior_command (cmd
, strlen (cmd
) + 1);
3047 strcpy (errout
, cmd
);
3056 clone_fast_tracepoint (struct tracepoint
*to
, const struct tracepoint
*from
)
3058 to
->jump_pad
= from
->jump_pad
;
3059 to
->jump_pad_end
= from
->jump_pad_end
;
3060 to
->trampoline
= from
->trampoline
;
3061 to
->trampoline_end
= from
->trampoline_end
;
3062 to
->adjusted_insn_addr
= from
->adjusted_insn_addr
;
3063 to
->adjusted_insn_addr_end
= from
->adjusted_insn_addr_end
;
3064 to
->handle
= from
->handle
;
3066 gdb_assert (from
->handle
);
3067 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump
*) from
->handle
);
3070 #define MAX_JUMP_SIZE 20
3072 /* Install fast tracepoint. Return 0 if successful, otherwise return
3076 install_fast_tracepoint (struct tracepoint
*tpoint
, char *errbuf
)
3078 CORE_ADDR jentry
, jump_entry
;
3079 CORE_ADDR trampoline
;
3080 ULONGEST trampoline_size
;
3082 /* The jump to the jump pad of the last fast tracepoint
3084 unsigned char fjump
[MAX_JUMP_SIZE
];
3085 ULONGEST fjump_size
;
3087 if (tpoint
->orig_size
< target_get_min_fast_tracepoint_insn_len ())
3089 trace_debug ("Requested a fast tracepoint on an instruction "
3090 "that is of less than the minimum length.");
3094 jentry
= jump_entry
= get_jump_space_head ();
3097 trampoline_size
= 0;
3099 /* Install the jump pad. */
3100 err
= install_fast_tracepoint_jump_pad (tpoint
->obj_addr_on_target
,
3102 ipa_sym_addrs
.addr_gdb_collect
,
3103 ipa_sym_addrs
.addr_collecting
,
3106 &trampoline
, &trampoline_size
,
3108 &tpoint
->adjusted_insn_addr
,
3109 &tpoint
->adjusted_insn_addr_end
,
3116 tpoint
->handle
= set_fast_tracepoint_jump (tpoint
->address
, fjump
,
3119 if (tpoint
->handle
!= NULL
)
3121 tpoint
->jump_pad
= jump_entry
;
3122 tpoint
->jump_pad_end
= jentry
;
3123 tpoint
->trampoline
= trampoline
;
3124 tpoint
->trampoline_end
= trampoline
+ trampoline_size
;
3126 /* Pad to 8-byte alignment. */
3127 jentry
= ((jentry
+ 7) & ~0x7);
3128 claim_jump_space (jentry
- jump_entry
);
3135 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3138 install_tracepoint (struct tracepoint
*tpoint
, char *own_buf
)
3140 tpoint
->handle
= NULL
;
3143 if (tpoint
->type
== trap_tracepoint
)
3145 /* Tracepoints are installed as memory breakpoints. Just go
3146 ahead and install the trap. The breakpoints module
3147 handles duplicated breakpoints, and the memory read
3148 routine handles un-patching traps from memory reads. */
3149 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3150 tracepoint_handler
);
3152 else if (tpoint
->type
== fast_tracepoint
|| tpoint
->type
== static_tracepoint
)
3154 if (!agent_loaded_p ())
3156 trace_debug ("Requested a %s tracepoint, but fast "
3157 "tracepoints aren't supported.",
3158 tpoint
->type
== static_tracepoint
? "static" : "fast");
3159 write_e_ipa_not_loaded (own_buf
);
3162 if (tpoint
->type
== static_tracepoint
3163 && !in_process_agent_supports_ust ())
3165 trace_debug ("Requested a static tracepoint, but static "
3166 "tracepoints are not supported.");
3167 write_e_ust_not_loaded (own_buf
);
3171 if (tpoint
->type
== fast_tracepoint
)
3172 install_fast_tracepoint (tpoint
, own_buf
);
3175 if (probe_marker_at (tpoint
->address
, own_buf
) == 0)
3176 tpoint
->handle
= (void *) -1;
3181 internal_error (__FILE__
, __LINE__
, "Unknown tracepoint type");
3183 if (tpoint
->handle
== NULL
)
3185 if (*own_buf
== '\0')
3186 write_enn (own_buf
);
3192 static void download_tracepoint_1 (struct tracepoint
*tpoint
);
3195 cmd_qtstart (char *packet
)
3197 struct tracepoint
*tpoint
, *prev_ftpoint
, *prev_stpoint
;
3198 CORE_ADDR tpptr
= 0, prev_tpptr
= 0;
3200 trace_debug ("Starting the trace");
3202 /* Pause all threads temporarily while we patch tracepoints. */
3205 /* Get threads out of jump pads. Safe to do here, since this is a
3206 top level command. And, required to do here, since we're
3207 deleting/rewriting jump pads. */
3209 stabilize_threads ();
3211 /* Freeze threads. */
3214 /* Sync the fast tracepoints list in the inferior ftlib. */
3215 if (agent_loaded_p ())
3216 download_trace_state_variables ();
3218 /* No previous fast tpoint yet. */
3219 prev_ftpoint
= NULL
;
3221 /* No previous static tpoint yet. */
3222 prev_stpoint
= NULL
;
3226 /* Start out empty. */
3227 if (agent_loaded_p ())
3228 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, 0);
3230 /* Download and install tracepoints. */
3231 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
3233 /* Ensure all the hit counts start at zero. */
3234 tpoint
->hit_count
= 0;
3235 tpoint
->traceframe_usage
= 0;
3237 if (tpoint
->type
== trap_tracepoint
)
3239 /* Tracepoints are installed as memory breakpoints. Just go
3240 ahead and install the trap. The breakpoints module
3241 handles duplicated breakpoints, and the memory read
3242 routine handles un-patching traps from memory reads. */
3243 tpoint
->handle
= set_breakpoint_at (tpoint
->address
,
3244 tracepoint_handler
);
3246 else if (tpoint
->type
== fast_tracepoint
3247 || tpoint
->type
== static_tracepoint
)
3249 if (maybe_write_ipa_not_loaded (packet
))
3251 trace_debug ("Requested a %s tracepoint, but fast "
3252 "tracepoints aren't supported.",
3253 tpoint
->type
== static_tracepoint
3254 ? "static" : "fast");
3258 if (tpoint
->type
== fast_tracepoint
)
3261 = use_agent
&& agent_capability_check (AGENT_CAPA_FAST_TRACE
);
3263 if (prev_ftpoint
!= NULL
3264 && prev_ftpoint
->address
== tpoint
->address
)
3267 tracepoint_send_agent (tpoint
);
3269 download_tracepoint_1 (tpoint
);
3271 clone_fast_tracepoint (tpoint
, prev_ftpoint
);
3275 /* Tracepoint is installed successfully? */
3278 /* Download and install fast tracepoint by agent. */
3280 installed
= !tracepoint_send_agent (tpoint
);
3283 download_tracepoint_1 (tpoint
);
3284 installed
= !install_fast_tracepoint (tpoint
, packet
);
3288 prev_ftpoint
= tpoint
;
3293 if (!in_process_agent_supports_ust ())
3295 trace_debug ("Requested a static tracepoint, but static "
3296 "tracepoints are not supported.");
3300 download_tracepoint_1 (tpoint
);
3301 /* Can only probe a given marker once. */
3302 if (prev_stpoint
!= NULL
3303 && prev_stpoint
->address
== tpoint
->address
)
3304 tpoint
->handle
= (void *) -1;
3307 if (probe_marker_at (tpoint
->address
, packet
) == 0)
3309 tpoint
->handle
= (void *) -1;
3311 /* So that we can handle multiple static tracepoints
3312 at the same address easily. */
3313 prev_stpoint
= tpoint
;
3319 tpptr
= tpoint
->obj_addr_on_target
;
3321 if (tpoint
== tracepoints
)
3322 /* First object in list, set the head pointer in the
3324 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
, tpptr
);
3326 write_inferior_data_ptr (prev_tpptr
+ offsetof (struct tracepoint
,
3331 /* Any failure in the inner loop is sufficient cause to give
3333 if (tpoint
->handle
== NULL
)
3337 /* Any error in tracepoint insertion is unacceptable; better to
3338 address the problem now, than end up with a useless or misleading
3342 clear_installed_tracepoints ();
3343 if (*packet
== '\0')
3349 stopping_tracepoint
= NULL
;
3350 trace_buffer_is_full
= 0;
3351 expr_eval_result
= expr_eval_no_error
;
3352 error_tracepoint
= NULL
;
3353 tracing_start_time
= get_timestamp ();
3355 /* Tracing is now active, hits will now start being logged. */
3358 if (agent_loaded_p ())
3360 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 1))
3362 internal_error (__FILE__
, __LINE__
,
3363 "Error setting tracing variable in lib");
3366 if (write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
3369 internal_error (__FILE__
, __LINE__
,
3370 "Error clearing stopping_tracepoint variable"
3374 if (write_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
, 0))
3376 internal_error (__FILE__
, __LINE__
,
3377 "Error clearing trace_buffer_is_full variable"
3381 stop_tracing_bkpt
= set_breakpoint_at (ipa_sym_addrs
.addr_stop_tracing
,
3382 stop_tracing_handler
);
3383 if (stop_tracing_bkpt
== NULL
)
3384 error ("Error setting stop_tracing breakpoint");
3386 flush_trace_buffer_bkpt
3387 = set_breakpoint_at (ipa_sym_addrs
.addr_flush_trace_buffer
,
3388 flush_trace_buffer_handler
);
3389 if (flush_trace_buffer_bkpt
== NULL
)
3390 error ("Error setting flush_trace_buffer breakpoint");
3398 /* End a tracing run, filling in a stop reason to report back to GDB,
3399 and removing the tracepoints from the code. */
3406 trace_debug ("Tracing is already off, ignoring");
3410 trace_debug ("Stopping the trace");
3412 /* Pause all threads before removing fast jumps from memory,
3413 breakpoints, and touching IPA state variables (inferior memory).
3414 Some thread may hit the internal tracing breakpoints, or be
3415 collecting this moment, but that's ok, we don't release the
3416 tpoint object's memory or the jump pads here (we only do that
3417 when we're sure we can move all threads out of the jump pads).
3418 We can't now, since we may be getting here due to the inferior
3419 agent calling us. */
3422 /* Stop logging. Tracepoints can still be hit, but they will not be
3425 if (agent_loaded_p ())
3427 if (write_inferior_integer (ipa_sym_addrs
.addr_tracing
, 0))
3429 internal_error (__FILE__
, __LINE__
,
3430 "Error clearing tracing variable in lib");
3434 tracing_stop_time
= get_timestamp ();
3435 tracing_stop_reason
= "t???";
3436 tracing_stop_tpnum
= 0;
3437 if (stopping_tracepoint
)
3439 trace_debug ("Stopping the trace because "
3440 "tracepoint %d was hit %" PRIu64
" times",
3441 stopping_tracepoint
->number
,
3442 stopping_tracepoint
->pass_count
);
3443 tracing_stop_reason
= "tpasscount";
3444 tracing_stop_tpnum
= stopping_tracepoint
->number
;
3446 else if (trace_buffer_is_full
)
3448 trace_debug ("Stopping the trace because the trace buffer is full");
3449 tracing_stop_reason
= "tfull";
3451 else if (expr_eval_result
!= expr_eval_no_error
)
3453 trace_debug ("Stopping the trace because of an expression eval error");
3454 tracing_stop_reason
= eval_result_names
[expr_eval_result
];
3455 tracing_stop_tpnum
= error_tracepoint
->number
;
3457 #ifndef IN_PROCESS_AGENT
3458 else if (!gdb_connected ())
3460 trace_debug ("Stopping the trace because GDB disconnected");
3461 tracing_stop_reason
= "tdisconnected";
3466 trace_debug ("Stopping the trace because of a tstop command");
3467 tracing_stop_reason
= "tstop";
3470 stopping_tracepoint
= NULL
;
3471 error_tracepoint
= NULL
;
3473 /* Clear out the tracepoints. */
3474 clear_installed_tracepoints ();
3476 if (agent_loaded_p ())
3478 /* Pull in fast tracepoint trace frames from the inferior lib
3479 buffer into our buffer, even if our buffer is already full,
3480 because we want to present the full number of created frames
3481 in addition to what fit in the trace buffer. */
3482 upload_fast_traceframes ();
3485 if (stop_tracing_bkpt
!= NULL
)
3487 delete_breakpoint (stop_tracing_bkpt
);
3488 stop_tracing_bkpt
= NULL
;
3491 if (flush_trace_buffer_bkpt
!= NULL
)
3493 delete_breakpoint (flush_trace_buffer_bkpt
);
3494 flush_trace_buffer_bkpt
= NULL
;
3501 stop_tracing_handler (CORE_ADDR addr
)
3503 trace_debug ("lib hit stop_tracing");
3505 /* Don't actually handle it here. When we stop tracing we remove
3506 breakpoints from the inferior, and that is not allowed in a
3507 breakpoint handler (as the caller is walking the breakpoint
3513 flush_trace_buffer_handler (CORE_ADDR addr
)
3515 trace_debug ("lib hit flush_trace_buffer");
3520 cmd_qtstop (char *packet
)
3527 cmd_qtdisconnected (char *own_buf
)
3530 char *packet
= own_buf
;
3532 packet
+= strlen ("QTDisconnected:");
3534 unpack_varlen_hex (packet
, &setting
);
3538 disconnected_tracing
= setting
;
3542 cmd_qtframe (char *own_buf
)
3544 ULONGEST frame
, pc
, lo
, hi
, num
;
3546 struct traceframe
*tframe
;
3547 char *packet
= own_buf
;
3549 packet
+= strlen ("QTFrame:");
3551 if (startswith (packet
, "pc:"))
3553 packet
+= strlen ("pc:");
3554 unpack_varlen_hex (packet
, &pc
);
3555 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc
));
3556 tframe
= find_next_traceframe_in_range (pc
, pc
, 1, &tfnum
);
3558 else if (startswith (packet
, "range:"))
3560 packet
+= strlen ("range:");
3561 packet
= unpack_varlen_hex (packet
, &lo
);
3563 unpack_varlen_hex (packet
, &hi
);
3564 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3565 paddress (lo
), paddress (hi
));
3566 tframe
= find_next_traceframe_in_range (lo
, hi
, 1, &tfnum
);
3568 else if (startswith (packet
, "outside:"))
3570 packet
+= strlen ("outside:");
3571 packet
= unpack_varlen_hex (packet
, &lo
);
3573 unpack_varlen_hex (packet
, &hi
);
3574 trace_debug ("Want to find next traceframe "
3575 "outside the range 0x%s to 0x%s",
3576 paddress (lo
), paddress (hi
));
3577 tframe
= find_next_traceframe_in_range (lo
, hi
, 0, &tfnum
);
3579 else if (startswith (packet
, "tdp:"))
3581 packet
+= strlen ("tdp:");
3582 unpack_varlen_hex (packet
, &num
);
3584 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum
);
3585 tframe
= find_next_traceframe_by_tracepoint (tpnum
, &tfnum
);
3589 unpack_varlen_hex (packet
, &frame
);
3590 tfnum
= (int) frame
;
3593 trace_debug ("Want to stop looking at traceframes");
3594 current_traceframe
= -1;
3598 trace_debug ("Want to look at traceframe %d", tfnum
);
3599 tframe
= find_traceframe (tfnum
);
3604 current_traceframe
= tfnum
;
3605 sprintf (own_buf
, "F%xT%x", tfnum
, tframe
->tpnum
);
3608 sprintf (own_buf
, "F-1");
3612 cmd_qtstatus (char *packet
)
3614 char *stop_reason_rsp
= NULL
;
3615 char *buf1
, *buf2
, *buf3
;
3619 /* Translate the plain text of the notes back into hex for
3622 str
= (tracing_user_name
? tracing_user_name
: "");
3623 slen
= strlen (str
);
3624 buf1
= (char *) alloca (slen
* 2 + 1);
3625 bin2hex ((gdb_byte
*) str
, buf1
, slen
);
3627 str
= (tracing_notes
? tracing_notes
: "");
3628 slen
= strlen (str
);
3629 buf2
= (char *) alloca (slen
* 2 + 1);
3630 bin2hex ((gdb_byte
*) str
, buf2
, slen
);
3632 str
= (tracing_stop_note
? tracing_stop_note
: "");
3633 slen
= strlen (str
);
3634 buf3
= (char *) alloca (slen
* 2 + 1);
3635 bin2hex ((gdb_byte
*) str
, buf3
, slen
);
3637 trace_debug ("Returning trace status as %d, stop reason %s",
3638 tracing
, tracing_stop_reason
);
3640 if (agent_loaded_p ())
3644 upload_fast_traceframes ();
3649 stop_reason_rsp
= (char *) tracing_stop_reason
;
3651 /* The user visible error string in terror needs to be hex encoded.
3652 We leave it as plain string in `tracing_stop_reason' to ease
3654 if (startswith (stop_reason_rsp
, "terror:"))
3656 const char *result_name
;
3660 result_name
= stop_reason_rsp
+ strlen ("terror:");
3661 hexstr_len
= strlen (result_name
) * 2;
3662 p
= stop_reason_rsp
= alloca (strlen ("terror:") + hexstr_len
+ 1);
3663 strcpy (p
, "terror:");
3665 bin2hex ((gdb_byte
*) result_name
, p
, strlen (result_name
));
3668 /* If this was a forced stop, include any stop note that was supplied. */
3669 if (strcmp (stop_reason_rsp
, "tstop") == 0)
3671 stop_reason_rsp
= alloca (strlen ("tstop:") + strlen (buf3
) + 1);
3672 strcpy (stop_reason_rsp
, "tstop:");
3673 strcat (stop_reason_rsp
, buf3
);
3679 "tframes:%x;tcreated:%x;"
3680 "tfree:%x;tsize:%s;"
3683 "starttime:%s;stoptime:%s;"
3684 "username:%s;notes:%s:",
3686 stop_reason_rsp
, tracing_stop_tpnum
,
3687 traceframe_count
, traceframes_created
,
3688 free_space (), phex_nz (trace_buffer_hi
- trace_buffer_lo
, 0),
3689 circular_trace_buffer
,
3690 disconnected_tracing
,
3691 phex_nz (tracing_start_time
, sizeof (tracing_start_time
)),
3692 phex_nz (tracing_stop_time
, sizeof (tracing_stop_time
)),
3697 cmd_qtp (char *own_buf
)
3700 struct tracepoint
*tpoint
;
3701 char *packet
= own_buf
;
3703 packet
+= strlen ("qTP:");
3705 packet
= unpack_varlen_hex (packet
, &num
);
3706 ++packet
; /* skip a colon */
3707 packet
= unpack_varlen_hex (packet
, &addr
);
3709 /* See if we already have this tracepoint. */
3710 tpoint
= find_tracepoint (num
, addr
);
3714 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3715 (int) num
, paddress (addr
));
3716 write_enn (own_buf
);
3720 sprintf (own_buf
, "V%" PRIu64
":%" PRIu64
"", tpoint
->hit_count
,
3721 tpoint
->traceframe_usage
);
3724 /* State variables to help return all the tracepoint bits. */
3725 static struct tracepoint
*cur_tpoint
;
3726 static unsigned int cur_action
;
3727 static unsigned int cur_step_action
;
3728 static struct source_string
*cur_source_string
;
3729 static struct trace_state_variable
*cur_tsv
;
3731 /* Compose a response that is an imitation of the syntax by which the
3732 tracepoint was originally downloaded. */
3735 response_tracepoint (char *packet
, struct tracepoint
*tpoint
)
3739 sprintf (packet
, "T%x:%s:%c:%" PRIx64
":%" PRIx64
, tpoint
->number
,
3740 paddress (tpoint
->address
),
3741 (tpoint
->enabled
? 'E' : 'D'), tpoint
->step_count
,
3742 tpoint
->pass_count
);
3743 if (tpoint
->type
== fast_tracepoint
)
3744 sprintf (packet
+ strlen (packet
), ":F%x", tpoint
->orig_size
);
3745 else if (tpoint
->type
== static_tracepoint
)
3746 sprintf (packet
+ strlen (packet
), ":S");
3750 buf
= gdb_unparse_agent_expr (tpoint
->cond
);
3751 sprintf (packet
+ strlen (packet
), ":X%x,%s",
3752 tpoint
->cond
->length
, buf
);
3757 /* Compose a response that is an imitation of the syntax by which the
3758 tracepoint action was originally downloaded (with the difference
3759 that due to the way we store the actions, this will output a packet
3760 per action, while GDB could have combined more than one action
3764 response_action (char *packet
, struct tracepoint
*tpoint
,
3765 char *taction
, int step
)
3767 sprintf (packet
, "%c%x:%s:%s",
3768 (step
? 'S' : 'A'), tpoint
->number
, paddress (tpoint
->address
),
3772 /* Compose a response that is an imitation of the syntax by which the
3773 tracepoint source piece was originally downloaded. */
3776 response_source (char *packet
,
3777 struct tracepoint
*tpoint
, struct source_string
*src
)
3782 len
= strlen (src
->str
);
3783 buf
= alloca (len
* 2 + 1);
3784 bin2hex ((gdb_byte
*) src
->str
, buf
, len
);
3786 sprintf (packet
, "Z%x:%s:%s:%x:%x:%s",
3787 tpoint
->number
, paddress (tpoint
->address
),
3788 src
->type
, 0, len
, buf
);
3791 /* Return the first piece of tracepoint definition, and initialize the
3792 state machine that will iterate through all the tracepoint
3796 cmd_qtfp (char *packet
)
3798 trace_debug ("Returning first tracepoint definition piece");
3800 cur_tpoint
= tracepoints
;
3801 cur_action
= cur_step_action
= 0;
3802 cur_source_string
= NULL
;
3805 response_tracepoint (packet
, cur_tpoint
);
3807 strcpy (packet
, "l");
3810 /* Return additional pieces of tracepoint definition. Each action and
3811 stepping action must go into its own packet, because of packet size
3812 limits, and so we use state variables to deliver one piece at a
3816 cmd_qtsp (char *packet
)
3818 trace_debug ("Returning subsequent tracepoint definition piece");
3822 /* This case would normally never occur, but be prepared for
3824 strcpy (packet
, "l");
3826 else if (cur_action
< cur_tpoint
->numactions
)
3828 response_action (packet
, cur_tpoint
,
3829 cur_tpoint
->actions_str
[cur_action
], 0);
3832 else if (cur_step_action
< cur_tpoint
->num_step_actions
)
3834 response_action (packet
, cur_tpoint
,
3835 cur_tpoint
->step_actions_str
[cur_step_action
], 1);
3838 else if ((cur_source_string
3839 ? cur_source_string
->next
3840 : cur_tpoint
->source_strings
))
3842 if (cur_source_string
)
3843 cur_source_string
= cur_source_string
->next
;
3845 cur_source_string
= cur_tpoint
->source_strings
;
3846 response_source (packet
, cur_tpoint
, cur_source_string
);
3850 cur_tpoint
= cur_tpoint
->next
;
3851 cur_action
= cur_step_action
= 0;
3852 cur_source_string
= NULL
;
3854 response_tracepoint (packet
, cur_tpoint
);
3856 strcpy (packet
, "l");
3860 /* Compose a response that is an imitation of the syntax by which the
3861 trace state variable was originally downloaded. */
3864 response_tsv (char *packet
, struct trace_state_variable
*tsv
)
3866 char *buf
= (char *) "";
3871 namelen
= strlen (tsv
->name
);
3872 buf
= alloca (namelen
* 2 + 1);
3873 bin2hex ((gdb_byte
*) tsv
->name
, buf
, namelen
);
3876 sprintf (packet
, "%x:%s:%x:%s", tsv
->number
, phex_nz (tsv
->initial_value
, 0),
3877 tsv
->getter
? 1 : 0, buf
);
3880 /* Return the first trace state variable definition, and initialize
3881 the state machine that will iterate through all the tsv bits. */
3884 cmd_qtfv (char *packet
)
3886 trace_debug ("Returning first trace state variable definition");
3888 cur_tsv
= trace_state_variables
;
3891 response_tsv (packet
, cur_tsv
);
3893 strcpy (packet
, "l");
3896 /* Return additional trace state variable definitions. */
3899 cmd_qtsv (char *packet
)
3901 trace_debug ("Returning additional trace state variable definition");
3905 cur_tsv
= cur_tsv
->next
;
3907 response_tsv (packet
, cur_tsv
);
3909 strcpy (packet
, "l");
3912 strcpy (packet
, "l");
3915 /* Return the first static tracepoint marker, and initialize the state
3916 machine that will iterate through all the static tracepoints
3920 cmd_qtfstm (char *packet
)
3922 if (!maybe_write_ipa_ust_not_loaded (packet
))
3923 run_inferior_command (packet
, strlen (packet
) + 1);
3926 /* Return additional static tracepoints markers. */
3929 cmd_qtsstm (char *packet
)
3931 if (!maybe_write_ipa_ust_not_loaded (packet
))
3932 run_inferior_command (packet
, strlen (packet
) + 1);
3935 /* Return the definition of the static tracepoint at a given address.
3936 Result packet is the same as qTsST's. */
3939 cmd_qtstmat (char *packet
)
3941 if (!maybe_write_ipa_ust_not_loaded (packet
))
3942 run_inferior_command (packet
, strlen (packet
) + 1);
3945 /* Helper for gdb_agent_about_to_close.
3946 Return non-zero if thread ENTRY is in the same process in DATA. */
3949 same_process_p (struct inferior_list_entry
*entry
, void *data
)
3953 return ptid_get_pid (entry
->id
) == *pid
;
3956 /* Sent the agent a command to close it. */
3959 gdb_agent_about_to_close (int pid
)
3961 char buf
[IPA_CMD_BUF_SIZE
];
3963 if (!maybe_write_ipa_not_loaded (buf
))
3965 struct thread_info
*saved_thread
;
3967 saved_thread
= current_thread
;
3969 /* Find any thread which belongs to process PID. */
3970 current_thread
= (struct thread_info
*)
3971 find_inferior (&all_threads
, same_process_p
, &pid
);
3973 strcpy (buf
, "close");
3975 run_inferior_command (buf
, strlen (buf
) + 1);
3977 current_thread
= saved_thread
;
3981 /* Return the minimum instruction size needed for fast tracepoints as a
3982 hexadecimal number. */
3985 cmd_qtminftpilen (char *packet
)
3987 if (current_thread
== NULL
)
3989 /* Indicate that the minimum length is currently unknown. */
3990 strcpy (packet
, "0");
3994 sprintf (packet
, "%x", target_get_min_fast_tracepoint_insn_len ());
3997 /* Respond to qTBuffer packet with a block of raw data from the trace
3998 buffer. GDB may ask for a lot, but we are allowed to reply with
3999 only as much as will fit within packet limits or whatever. */
4002 cmd_qtbuffer (char *own_buf
)
4004 ULONGEST offset
, num
, tot
;
4006 char *packet
= own_buf
;
4008 packet
+= strlen ("qTBuffer:");
4010 packet
= unpack_varlen_hex (packet
, &offset
);
4011 ++packet
; /* skip a comma */
4012 unpack_varlen_hex (packet
, &num
);
4014 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
4015 (int) num
, phex_nz (offset
, 0));
4017 tot
= (trace_buffer_hi
- trace_buffer_lo
) - free_space ();
4019 /* If we're right at the end, reply specially that we're done. */
4022 strcpy (own_buf
, "l");
4026 /* Object to any other out-of-bounds request. */
4029 write_enn (own_buf
);
4033 /* Compute the pointer corresponding to the given offset, accounting
4035 tbp
= trace_buffer_start
+ offset
;
4036 if (tbp
>= trace_buffer_wrap
)
4037 tbp
-= (trace_buffer_wrap
- trace_buffer_lo
);
4039 /* Trim to the remaining bytes if we're close to the end. */
4040 if (num
> tot
- offset
)
4043 /* Trim to available packet size. */
4044 if (num
>= (PBUFSIZ
- 16) / 2 )
4045 num
= (PBUFSIZ
- 16) / 2;
4047 bin2hex (tbp
, own_buf
, num
);
4051 cmd_bigqtbuffer_circular (char *own_buf
)
4054 char *packet
= own_buf
;
4056 packet
+= strlen ("QTBuffer:circular:");
4058 unpack_varlen_hex (packet
, &val
);
4059 circular_trace_buffer
= val
;
4060 trace_debug ("Trace buffer is now %s",
4061 circular_trace_buffer
? "circular" : "linear");
4066 cmd_bigqtbuffer_size (char *own_buf
)
4070 char *packet
= own_buf
;
4072 /* Can't change the size during a tracing run. */
4075 write_enn (own_buf
);
4079 packet
+= strlen ("QTBuffer:size:");
4081 /* -1 is sent as literal "-1". */
4082 if (strcmp (packet
, "-1") == 0)
4083 sval
= DEFAULT_TRACE_BUFFER_SIZE
;
4086 unpack_varlen_hex (packet
, &val
);
4087 sval
= (LONGEST
) val
;
4090 init_trace_buffer (sval
);
4091 trace_debug ("Trace buffer is now %s bytes",
4092 plongest (trace_buffer_size
));
4097 cmd_qtnotes (char *own_buf
)
4100 char *saved
, *user
, *notes
, *stopnote
;
4101 char *packet
= own_buf
;
4103 packet
+= strlen ("QTNotes:");
4107 if (startswith (packet
, "user:"))
4109 packet
+= strlen ("user:");
4111 packet
= strchr (packet
, ';');
4112 nbytes
= (packet
- saved
) / 2;
4113 user
= xmalloc (nbytes
+ 1);
4114 nbytes
= hex2bin (saved
, (gdb_byte
*) user
, nbytes
);
4115 user
[nbytes
] = '\0';
4116 ++packet
; /* skip the semicolon */
4117 trace_debug ("User is '%s'", user
);
4118 xfree (tracing_user_name
);
4119 tracing_user_name
= user
;
4121 else if (startswith (packet
, "notes:"))
4123 packet
+= strlen ("notes:");
4125 packet
= strchr (packet
, ';');
4126 nbytes
= (packet
- saved
) / 2;
4127 notes
= xmalloc (nbytes
+ 1);
4128 nbytes
= hex2bin (saved
, (gdb_byte
*) notes
, nbytes
);
4129 notes
[nbytes
] = '\0';
4130 ++packet
; /* skip the semicolon */
4131 trace_debug ("Notes is '%s'", notes
);
4132 xfree (tracing_notes
);
4133 tracing_notes
= notes
;
4135 else if (startswith (packet
, "tstop:"))
4137 packet
+= strlen ("tstop:");
4139 packet
= strchr (packet
, ';');
4140 nbytes
= (packet
- saved
) / 2;
4141 stopnote
= xmalloc (nbytes
+ 1);
4142 nbytes
= hex2bin (saved
, (gdb_byte
*) stopnote
, nbytes
);
4143 stopnote
[nbytes
] = '\0';
4144 ++packet
; /* skip the semicolon */
4145 trace_debug ("tstop note is '%s'", stopnote
);
4146 xfree (tracing_stop_note
);
4147 tracing_stop_note
= stopnote
;
4157 handle_tracepoint_general_set (char *packet
)
4159 if (strcmp ("QTinit", packet
) == 0)
4161 cmd_qtinit (packet
);
4164 else if (startswith (packet
, "QTDP:"))
4169 else if (startswith (packet
, "QTDPsrc:"))
4171 cmd_qtdpsrc (packet
);
4174 else if (startswith (packet
, "QTEnable:"))
4176 cmd_qtenable_disable (packet
, 1);
4179 else if (startswith (packet
, "QTDisable:"))
4181 cmd_qtenable_disable (packet
, 0);
4184 else if (startswith (packet
, "QTDV:"))
4189 else if (startswith (packet
, "QTro:"))
4194 else if (strcmp ("QTStart", packet
) == 0)
4196 cmd_qtstart (packet
);
4199 else if (strcmp ("QTStop", packet
) == 0)
4201 cmd_qtstop (packet
);
4204 else if (startswith (packet
, "QTDisconnected:"))
4206 cmd_qtdisconnected (packet
);
4209 else if (startswith (packet
, "QTFrame:"))
4211 cmd_qtframe (packet
);
4214 else if (startswith (packet
, "QTBuffer:circular:"))
4216 cmd_bigqtbuffer_circular (packet
);
4219 else if (startswith (packet
, "QTBuffer:size:"))
4221 cmd_bigqtbuffer_size (packet
);
4224 else if (startswith (packet
, "QTNotes:"))
4226 cmd_qtnotes (packet
);
4234 handle_tracepoint_query (char *packet
)
4236 if (strcmp ("qTStatus", packet
) == 0)
4238 cmd_qtstatus (packet
);
4241 else if (startswith (packet
, "qTP:"))
4246 else if (strcmp ("qTfP", packet
) == 0)
4251 else if (strcmp ("qTsP", packet
) == 0)
4256 else if (strcmp ("qTfV", packet
) == 0)
4261 else if (strcmp ("qTsV", packet
) == 0)
4266 else if (startswith (packet
, "qTV:"))
4271 else if (startswith (packet
, "qTBuffer:"))
4273 cmd_qtbuffer (packet
);
4276 else if (strcmp ("qTfSTM", packet
) == 0)
4278 cmd_qtfstm (packet
);
4281 else if (strcmp ("qTsSTM", packet
) == 0)
4283 cmd_qtsstm (packet
);
4286 else if (startswith (packet
, "qTSTMat:"))
4288 cmd_qtstmat (packet
);
4291 else if (strcmp ("qTMinFTPILen", packet
) == 0)
4293 cmd_qtminftpilen (packet
);
4301 #ifndef IN_PROCESS_AGENT
4303 /* Call this when thread TINFO has hit the tracepoint defined by
4304 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4305 action. This adds a while-stepping collecting state item to the
4306 threads' collecting state list, so that we can keep track of
4307 multiple simultaneous while-stepping actions being collected by the
4308 same thread. This can happen in cases like:
4310 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4312 ff0003 INSN3 <-- TP2, collect $regs
4313 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4316 Notice that when instruction INSN5 is reached, the while-stepping
4317 actions of both TP1 and TP3 are still being collected, and that TP2
4318 had been collected meanwhile. The whole range of ff0001-ff0005
4319 should be single-stepped, due to at least TP1's while-stepping
4320 action covering the whole range. */
4323 add_while_stepping_state (struct thread_info
*tinfo
,
4324 int tp_number
, CORE_ADDR tp_address
)
4326 struct wstep_state
*wstep
= XNEW (struct wstep_state
);
4328 wstep
->next
= tinfo
->while_stepping
;
4330 wstep
->tp_number
= tp_number
;
4331 wstep
->tp_address
= tp_address
;
4332 wstep
->current_step
= 0;
4334 tinfo
->while_stepping
= wstep
;
4337 /* Release the while-stepping collecting state WSTEP. */
4340 release_while_stepping_state (struct wstep_state
*wstep
)
4345 /* Release all while-stepping collecting states currently associated
4346 with thread TINFO. */
4349 release_while_stepping_state_list (struct thread_info
*tinfo
)
4351 struct wstep_state
*head
;
4353 while (tinfo
->while_stepping
)
4355 head
= tinfo
->while_stepping
;
4356 tinfo
->while_stepping
= head
->next
;
4357 release_while_stepping_state (head
);
4361 /* If TINFO was handling a 'while-stepping' action, the step has
4362 finished, so collect any step data needed, and check if any more
4363 steps are required. Return true if the thread was indeed
4364 collecting tracepoint data, false otherwise. */
4367 tracepoint_finished_step (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4369 struct tracepoint
*tpoint
;
4370 struct wstep_state
*wstep
;
4371 struct wstep_state
**wstep_link
;
4372 struct trap_tracepoint_ctx ctx
;
4374 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4376 if (agent_loaded_p ())
4377 upload_fast_traceframes ();
4379 /* Check if we were indeed collecting data for one of more
4380 tracepoints with a 'while-stepping' count. */
4381 if (tinfo
->while_stepping
== NULL
)
4386 /* We're not even tracing anymore. Stop this thread from
4388 release_while_stepping_state_list (tinfo
);
4390 /* The thread had stopped due to a single-step request indeed
4391 explained by a tracepoint. */
4395 wstep
= tinfo
->while_stepping
;
4396 wstep_link
= &tinfo
->while_stepping
;
4398 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4399 target_pid_to_str (tinfo
->entry
.id
),
4400 wstep
->tp_number
, paddress (wstep
->tp_address
));
4402 ctx
.base
.type
= trap_tracepoint
;
4403 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4405 while (wstep
!= NULL
)
4407 tpoint
= find_tracepoint (wstep
->tp_number
, wstep
->tp_address
);
4410 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4411 wstep
->tp_number
, paddress (wstep
->tp_address
),
4412 target_pid_to_str (tinfo
->entry
.id
));
4415 *wstep_link
= wstep
->next
;
4416 release_while_stepping_state (wstep
);
4417 wstep
= *wstep_link
;
4421 /* We've just finished one step. */
4422 ++wstep
->current_step
;
4425 collect_data_at_step ((struct tracepoint_hit_ctx
*) &ctx
,
4426 stop_pc
, tpoint
, wstep
->current_step
);
4428 if (wstep
->current_step
>= tpoint
->step_count
)
4430 /* The requested numbers of steps have occurred. */
4431 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4432 target_pid_to_str (tinfo
->entry
.id
),
4433 wstep
->tp_number
, paddress (wstep
->tp_address
));
4435 /* Unlink the wstep. */
4436 *wstep_link
= wstep
->next
;
4437 release_while_stepping_state (wstep
);
4438 wstep
= *wstep_link
;
4440 /* Only check the hit count now, which ensure that we do all
4441 our stepping before stopping the run. */
4442 if (tpoint
->pass_count
> 0
4443 && tpoint
->hit_count
>= tpoint
->pass_count
4444 && stopping_tracepoint
== NULL
)
4445 stopping_tracepoint
= tpoint
;
4449 /* Keep single-stepping until the requested numbers of steps
4451 wstep_link
= &wstep
->next
;
4452 wstep
= *wstep_link
;
4455 if (stopping_tracepoint
4456 || trace_buffer_is_full
4457 || expr_eval_result
!= expr_eval_no_error
)
4467 /* Handle any internal tracing control breakpoint hits. That means,
4468 pull traceframes from the IPA to our buffer, and syncing both
4469 tracing agents when the IPA's tracing stops for some reason. */
4472 handle_tracepoint_bkpts (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4474 /* Pull in fast tracepoint trace frames from the inferior in-process
4475 agent's buffer into our buffer. */
4477 if (!agent_loaded_p ())
4480 upload_fast_traceframes ();
4482 /* Check if the in-process agent had decided we should stop
4484 if (stop_pc
== ipa_sym_addrs
.addr_stop_tracing
)
4486 int ipa_trace_buffer_is_full
;
4487 CORE_ADDR ipa_stopping_tracepoint
;
4488 int ipa_expr_eval_result
;
4489 CORE_ADDR ipa_error_tracepoint
;
4491 trace_debug ("lib stopped at stop_tracing");
4493 read_inferior_integer (ipa_sym_addrs
.addr_trace_buffer_is_full
,
4494 &ipa_trace_buffer_is_full
);
4496 read_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
,
4497 &ipa_stopping_tracepoint
);
4498 write_inferior_data_pointer (ipa_sym_addrs
.addr_stopping_tracepoint
, 0);
4500 read_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
,
4501 &ipa_error_tracepoint
);
4502 write_inferior_data_pointer (ipa_sym_addrs
.addr_error_tracepoint
, 0);
4504 read_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
,
4505 &ipa_expr_eval_result
);
4506 write_inferior_integer (ipa_sym_addrs
.addr_expr_eval_result
, 0);
4508 trace_debug ("lib: trace_buffer_is_full: %d, "
4509 "stopping_tracepoint: %s, "
4510 "ipa_expr_eval_result: %d, "
4511 "error_tracepoint: %s, ",
4512 ipa_trace_buffer_is_full
,
4513 paddress (ipa_stopping_tracepoint
),
4514 ipa_expr_eval_result
,
4515 paddress (ipa_error_tracepoint
));
4519 if (ipa_trace_buffer_is_full
)
4520 trace_debug ("lib stopped due to full buffer.");
4521 if (ipa_stopping_tracepoint
)
4522 trace_debug ("lib stopped due to tpoint");
4523 if (ipa_stopping_tracepoint
)
4524 trace_debug ("lib stopped due to error");
4527 if (ipa_stopping_tracepoint
!= 0)
4530 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint
);
4532 else if (ipa_expr_eval_result
!= expr_eval_no_error
)
4534 expr_eval_result
= ipa_expr_eval_result
;
4536 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint
);
4541 else if (stop_pc
== ipa_sym_addrs
.addr_flush_trace_buffer
)
4543 trace_debug ("lib stopped at flush_trace_buffer");
4550 /* Return true if TINFO just hit a tracepoint. Collect data if
4554 tracepoint_was_hit (struct thread_info
*tinfo
, CORE_ADDR stop_pc
)
4556 struct tracepoint
*tpoint
;
4558 struct trap_tracepoint_ctx ctx
;
4560 /* Not tracing, don't handle. */
4564 ctx
.base
.type
= trap_tracepoint
;
4565 ctx
.regcache
= get_thread_regcache (tinfo
, 1);
4567 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
4569 /* Note that we collect fast tracepoints here as well. We'll
4570 step over the fast tracepoint jump later, which avoids the
4571 double collect. However, we don't collect for static
4572 tracepoints here, because UST markers are compiled in program,
4573 and probes will be executed in program. So static tracepoints
4574 are collected there. */
4575 if (tpoint
->enabled
&& stop_pc
== tpoint
->address
4576 && tpoint
->type
!= static_tracepoint
)
4578 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4579 target_pid_to_str (tinfo
->entry
.id
),
4580 tpoint
->number
, paddress (tpoint
->address
));
4582 /* Test the condition if present, and collect if true. */
4584 || (condition_true_at_tracepoint
4585 ((struct tracepoint_hit_ctx
*) &ctx
, tpoint
)))
4586 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
4589 if (stopping_tracepoint
4590 || trace_buffer_is_full
4591 || expr_eval_result
!= expr_eval_no_error
)
4595 /* If the tracepoint had a 'while-stepping' action, then set
4596 the thread to collect this tracepoint on the following
4598 else if (tpoint
->step_count
> 0)
4600 add_while_stepping_state (tinfo
,
4601 tpoint
->number
, tpoint
->address
);
4613 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4614 struct ust_marker_data
;
4615 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4616 struct traceframe
*tframe
);
4619 /* Create a trace frame for the hit of the given tracepoint in the
4623 collect_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
, CORE_ADDR stop_pc
,
4624 struct tracepoint
*tpoint
)
4626 struct traceframe
*tframe
;
4629 /* Only count it as a hit when we actually collect data. */
4630 tpoint
->hit_count
++;
4632 /* If we've exceeded a defined pass count, record the event for
4633 later, and finish the collection for this hit. This test is only
4634 for nonstepping tracepoints, stepping tracepoints test at the end
4635 of their while-stepping loop. */
4636 if (tpoint
->pass_count
> 0
4637 && tpoint
->hit_count
>= tpoint
->pass_count
4638 && tpoint
->step_count
== 0
4639 && stopping_tracepoint
== NULL
)
4640 stopping_tracepoint
= tpoint
;
4642 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64
,
4643 tpoint
->number
, paddress (tpoint
->address
), tpoint
->hit_count
);
4645 tframe
= add_traceframe (tpoint
);
4649 for (acti
= 0; acti
< tpoint
->numactions
; ++acti
)
4651 #ifndef IN_PROCESS_AGENT
4652 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4653 tpoint
->number
, paddress (tpoint
->address
),
4654 tpoint
->actions_str
[acti
]);
4657 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4658 tpoint
->actions
[acti
]);
4661 finish_traceframe (tframe
);
4664 if (tframe
== NULL
&& tracing
)
4665 trace_buffer_is_full
= 1;
4668 #ifndef IN_PROCESS_AGENT
4671 collect_data_at_step (struct tracepoint_hit_ctx
*ctx
,
4673 struct tracepoint
*tpoint
, int current_step
)
4675 struct traceframe
*tframe
;
4678 trace_debug ("Making new step traceframe for "
4679 "tracepoint %d at 0x%s, step %d of %" PRIu64
", hit %" PRIu64
,
4680 tpoint
->number
, paddress (tpoint
->address
),
4681 current_step
, tpoint
->step_count
,
4684 tframe
= add_traceframe (tpoint
);
4688 for (acti
= 0; acti
< tpoint
->num_step_actions
; ++acti
)
4690 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4691 tpoint
->number
, paddress (tpoint
->address
),
4692 tpoint
->step_actions_str
[acti
]);
4694 do_action_at_tracepoint (ctx
, stop_pc
, tpoint
, tframe
,
4695 tpoint
->step_actions
[acti
]);
4698 finish_traceframe (tframe
);
4701 if (tframe
== NULL
&& tracing
)
4702 trace_buffer_is_full
= 1;
4707 #ifdef IN_PROCESS_AGENT
4708 /* The target description used by the IPA. Given that the IPA library
4709 is built for a specific architecture that is loaded into the
4710 inferior, there only needs to be one such description per
4712 const struct target_desc
*ipa_tdesc
;
4715 static struct regcache
*
4716 get_context_regcache (struct tracepoint_hit_ctx
*ctx
)
4718 struct regcache
*regcache
= NULL
;
4720 #ifdef IN_PROCESS_AGENT
4721 if (ctx
->type
== fast_tracepoint
)
4723 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4724 if (!fctx
->regcache_initted
)
4726 fctx
->regcache_initted
= 1;
4727 init_register_cache (&fctx
->regcache
, ipa_tdesc
, fctx
->regspace
);
4728 supply_regblock (&fctx
->regcache
, NULL
);
4729 supply_fast_tracepoint_registers (&fctx
->regcache
, fctx
->regs
);
4731 regcache
= &fctx
->regcache
;
4734 if (ctx
->type
== static_tracepoint
)
4736 struct static_tracepoint_ctx
*sctx
4737 = (struct static_tracepoint_ctx
*) ctx
;
4739 if (!sctx
->regcache_initted
)
4741 sctx
->regcache_initted
= 1;
4742 init_register_cache (&sctx
->regcache
, ipa_tdesc
, sctx
->regspace
);
4743 supply_regblock (&sctx
->regcache
, NULL
);
4744 /* Pass down the tracepoint address, because REGS doesn't
4745 include the PC, but we know what it must have been. */
4746 supply_static_tracepoint_registers (&sctx
->regcache
,
4747 (const unsigned char *)
4749 sctx
->tpoint
->address
);
4751 regcache
= &sctx
->regcache
;
4755 if (ctx
->type
== trap_tracepoint
)
4757 struct trap_tracepoint_ctx
*tctx
= (struct trap_tracepoint_ctx
*) ctx
;
4758 regcache
= tctx
->regcache
;
4762 gdb_assert (regcache
!= NULL
);
4768 do_action_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4770 struct tracepoint
*tpoint
,
4771 struct traceframe
*tframe
,
4772 struct tracepoint_action
*taction
)
4774 enum eval_result_type err
;
4776 switch (taction
->type
)
4780 struct collect_memory_action
*maction
;
4781 struct eval_agent_expr_context ax_ctx
;
4783 maction
= (struct collect_memory_action
*) taction
;
4784 ax_ctx
.regcache
= NULL
;
4785 ax_ctx
.tframe
= tframe
;
4786 ax_ctx
.tpoint
= tpoint
;
4788 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4789 pulongest (maction
->len
),
4790 paddress (maction
->addr
), maction
->basereg
);
4791 /* (should use basereg) */
4792 agent_mem_read (&ax_ctx
, NULL
, (CORE_ADDR
) maction
->addr
,
4798 unsigned char *regspace
;
4799 struct regcache tregcache
;
4800 struct regcache
*context_regcache
;
4803 trace_debug ("Want to collect registers");
4805 context_regcache
= get_context_regcache (ctx
);
4806 regcache_size
= register_cache_size (context_regcache
->tdesc
);
4808 /* Collect all registers for now. */
4809 regspace
= add_traceframe_block (tframe
, tpoint
, 1 + regcache_size
);
4810 if (regspace
== NULL
)
4812 trace_debug ("Trace buffer block allocation failed, skipping");
4815 /* Identify a register block. */
4818 /* Wrap the regblock in a register cache (in the stack, we
4819 don't want to malloc here). */
4820 init_register_cache (&tregcache
, context_regcache
->tdesc
,
4823 /* Copy the register data to the regblock. */
4824 regcache_cpy (&tregcache
, context_regcache
);
4826 #ifndef IN_PROCESS_AGENT
4827 /* On some platforms, trap-based tracepoints will have the PC
4828 pointing to the next instruction after the trap, but we
4829 don't want the user or GDB trying to guess whether the
4830 saved PC needs adjusting; so always record the adjusted
4831 stop_pc. Note that we can't use tpoint->address instead,
4832 since it will be wrong for while-stepping actions. This
4833 adjustment is a nop for fast tracepoints collected from the
4834 in-process lib (but not if GDBserver is collecting one
4835 preemptively), since the PC had already been adjusted to
4836 contain the tracepoint's address by the jump pad. */
4837 trace_debug ("Storing stop pc (0x%s) in regblock",
4838 paddress (stop_pc
));
4840 /* This changes the regblock, not the thread's
4842 regcache_write_pc (&tregcache
, stop_pc
);
4848 struct eval_expr_action
*eaction
;
4849 struct eval_agent_expr_context ax_ctx
;
4851 eaction
= (struct eval_expr_action
*) taction
;
4852 ax_ctx
.regcache
= get_context_regcache (ctx
);
4853 ax_ctx
.tframe
= tframe
;
4854 ax_ctx
.tpoint
= tpoint
;
4856 trace_debug ("Want to evaluate expression");
4858 err
= gdb_eval_agent_expr (&ax_ctx
, eaction
->expr
, NULL
);
4860 if (err
!= expr_eval_no_error
)
4862 record_tracepoint_error (tpoint
, "action expression", err
);
4869 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4870 trace_debug ("Want to collect static trace data");
4871 collect_ust_data_at_tracepoint (ctx
, tframe
);
4873 trace_debug ("warning: collecting static trace data, "
4874 "but static tracepoints are not supported");
4879 trace_debug ("unknown trace action '%c', ignoring", taction
->type
);
4885 condition_true_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
4886 struct tracepoint
*tpoint
)
4889 enum eval_result_type err
;
4891 /* Presently, gdbserver doesn't run compiled conditions, only the
4892 IPA does. If the program stops at a fast tracepoint's address
4893 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4894 gdbserver preemptively collect the fast tracepoint. Later, on
4895 resume, gdbserver steps over the fast tracepoint like it steps
4896 over breakpoints, so that the IPA doesn't see that fast
4897 tracepoint. This avoids double collects of fast tracepoints in
4898 that stopping scenario. Having gdbserver itself handle the fast
4899 tracepoint gives the user a consistent view of when fast or trap
4900 tracepoints are collected, compared to an alternative where only
4901 trap tracepoints are collected on stop, and fast tracepoints on
4902 resume. When a fast tracepoint is being processed by gdbserver,
4903 it is always the non-compiled condition expression that is
4905 #ifdef IN_PROCESS_AGENT
4906 if (tpoint
->compiled_cond
)
4908 struct fast_tracepoint_ctx
*fctx
= (struct fast_tracepoint_ctx
*) ctx
;
4909 err
= ((condfn
) (uintptr_t) (tpoint
->compiled_cond
)) (fctx
->regs
, &value
);
4914 struct eval_agent_expr_context ax_ctx
;
4916 ax_ctx
.regcache
= get_context_regcache (ctx
);
4917 ax_ctx
.tframe
= NULL
;
4918 ax_ctx
.tpoint
= tpoint
;
4920 err
= gdb_eval_agent_expr (&ax_ctx
, tpoint
->cond
, &value
);
4922 if (err
!= expr_eval_no_error
)
4924 record_tracepoint_error (tpoint
, "condition", err
);
4925 /* The error case must return false. */
4929 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4930 tpoint
->number
, paddress (tpoint
->address
),
4932 return (value
? 1 : 0);
4935 /* Do memory copies for bytecodes. */
4936 /* Do the recording of memory blocks for actions and bytecodes. */
4939 agent_mem_read (struct eval_agent_expr_context
*ctx
,
4940 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4942 unsigned char *mspace
;
4943 ULONGEST remaining
= len
;
4944 unsigned short blocklen
;
4946 /* If a 'to' buffer is specified, use it. */
4949 read_inferior_memory (from
, to
, len
);
4953 /* Otherwise, create a new memory block in the trace buffer. */
4954 while (remaining
> 0)
4958 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4959 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
4960 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
4963 /* Identify block as a memory block. */
4966 /* Record address and size. */
4967 memcpy (mspace
, &from
, sizeof (from
));
4968 mspace
+= sizeof (from
);
4969 memcpy (mspace
, &blocklen
, sizeof (blocklen
));
4970 mspace
+= sizeof (blocklen
);
4971 /* Record the memory block proper. */
4972 read_inferior_memory (from
, mspace
, blocklen
);
4973 trace_debug ("%d bytes recorded", blocklen
);
4974 remaining
-= blocklen
;
4981 agent_mem_read_string (struct eval_agent_expr_context
*ctx
,
4982 unsigned char *to
, CORE_ADDR from
, ULONGEST len
)
4984 unsigned char *buf
, *mspace
;
4985 ULONGEST remaining
= len
;
4986 unsigned short blocklen
, i
;
4988 /* To save a bit of space, block lengths are 16-bit, so break large
4989 requests into multiple blocks. Bordering on overkill for strings,
4990 but it could happen that someone specifies a large max length. */
4991 while (remaining
> 0)
4995 blocklen
= (remaining
> 65535 ? 65535 : remaining
);
4996 /* We want working space to accumulate nonzero bytes, since
4997 traceframes must have a predecided size (otherwise it gets
4998 harder to wrap correctly for the circular case, etc). */
4999 buf
= (unsigned char *) xmalloc (blocklen
+ 1);
5000 for (i
= 0; i
< blocklen
; ++i
)
5002 /* Read the string one byte at a time, in case the string is
5003 at the end of a valid memory area - we don't want a
5004 correctly-terminated string to engender segvio
5006 read_inferior_memory (from
+ i
, buf
+ i
, 1);
5011 /* Make sure outer loop stops now too. */
5012 remaining
= blocklen
;
5016 sp
= 1 + sizeof (from
) + sizeof (blocklen
) + blocklen
;
5017 mspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
, sp
);
5023 /* Identify block as a memory block. */
5026 /* Record address and size. */
5027 memcpy ((void *) mspace
, (void *) &from
, sizeof (from
));
5028 mspace
+= sizeof (from
);
5029 memcpy ((void *) mspace
, (void *) &blocklen
, sizeof (blocklen
));
5030 mspace
+= sizeof (blocklen
);
5031 /* Copy the string contents. */
5032 memcpy ((void *) mspace
, (void *) buf
, blocklen
);
5033 remaining
-= blocklen
;
5040 /* Record the value of a trace state variable. */
5043 agent_tsv_read (struct eval_agent_expr_context
*ctx
, int n
)
5045 unsigned char *vspace
;
5048 vspace
= add_traceframe_block (ctx
->tframe
, ctx
->tpoint
,
5049 1 + sizeof (n
) + sizeof (LONGEST
));
5052 /* Identify block as a variable. */
5054 /* Record variable's number and value. */
5055 memcpy (vspace
+ 1, &n
, sizeof (n
));
5056 val
= get_trace_state_variable_value (n
);
5057 memcpy (vspace
+ 1 + sizeof (n
), &val
, sizeof (val
));
5058 trace_debug ("Variable %d recorded", n
);
5062 #ifndef IN_PROCESS_AGENT
5064 /* Callback for traceframe_walk_blocks, used to find a given block
5065 type in a traceframe. */
5068 match_blocktype (char blocktype
, unsigned char *dataptr
, void *data
)
5070 char *wantedp
= data
;
5072 if (*wantedp
== blocktype
)
5078 /* Walk over all traceframe blocks of the traceframe buffer starting
5079 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5080 block found, passing in DATA unmodified. If CALLBACK returns true,
5081 this returns a pointer to where the block is found. Returns NULL
5082 if no callback call returned true, indicating that all blocks have
5085 static unsigned char *
5086 traceframe_walk_blocks (unsigned char *database
, unsigned int datasize
,
5088 int (*callback
) (char blocktype
,
5089 unsigned char *dataptr
,
5093 unsigned char *dataptr
;
5097 trace_debug ("traceframe %d has no data", tfnum
);
5101 /* Iterate through a traceframe's blocks, looking for a block of the
5103 for (dataptr
= database
;
5104 dataptr
< database
+ datasize
;
5108 unsigned short mlen
;
5110 if (dataptr
== trace_buffer_wrap
)
5112 /* Adjust to reflect wrapping part of the frame around to
5114 datasize
= dataptr
- database
;
5115 dataptr
= database
= trace_buffer_lo
;
5118 blocktype
= *dataptr
++;
5120 if ((*callback
) (blocktype
, dataptr
, data
))
5126 /* Skip over the registers block. */
5127 dataptr
+= current_target_desc ()->registers_size
;
5130 /* Skip over the memory block. */
5131 dataptr
+= sizeof (CORE_ADDR
);
5132 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5133 dataptr
+= (sizeof (mlen
) + mlen
);
5136 /* Skip over the TSV block. */
5137 dataptr
+= (sizeof (int) + sizeof (LONGEST
));
5140 /* Skip over the static trace data block. */
5141 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5142 dataptr
+= (sizeof (mlen
) + mlen
);
5145 trace_debug ("traceframe %d has unknown block type 0x%x",
5154 /* Look for the block of type TYPE_WANTED in the trameframe starting
5155 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5158 static unsigned char *
5159 traceframe_find_block_type (unsigned char *database
, unsigned int datasize
,
5160 int tfnum
, char type_wanted
)
5162 return traceframe_walk_blocks (database
, datasize
, tfnum
,
5163 match_blocktype
, &type_wanted
);
5166 static unsigned char *
5167 traceframe_find_regblock (struct traceframe
*tframe
, int tfnum
)
5169 unsigned char *regblock
;
5171 regblock
= traceframe_find_block_type (tframe
->data
,
5175 if (regblock
== NULL
)
5176 trace_debug ("traceframe %d has no register data", tfnum
);
5181 /* Get registers from a traceframe. */
5184 fetch_traceframe_registers (int tfnum
, struct regcache
*regcache
, int regnum
)
5186 unsigned char *dataptr
;
5187 struct tracepoint
*tpoint
;
5188 struct traceframe
*tframe
;
5190 tframe
= find_traceframe (tfnum
);
5194 trace_debug ("traceframe %d not found", tfnum
);
5198 dataptr
= traceframe_find_regblock (tframe
, tfnum
);
5199 if (dataptr
== NULL
)
5201 /* Mark registers unavailable. */
5202 supply_regblock (regcache
, NULL
);
5204 /* We can generally guess at a PC, although this will be
5205 misleading for while-stepping frames and multi-location
5207 tpoint
= find_next_tracepoint_by_number (NULL
, tframe
->tpnum
);
5209 regcache_write_pc (regcache
, tpoint
->address
);
5212 supply_regblock (regcache
, dataptr
);
5218 traceframe_get_pc (struct traceframe
*tframe
)
5220 struct regcache regcache
;
5221 unsigned char *dataptr
;
5222 const struct target_desc
*tdesc
= current_target_desc ();
5224 dataptr
= traceframe_find_regblock (tframe
, -1);
5225 if (dataptr
== NULL
)
5228 init_register_cache (®cache
, tdesc
, dataptr
);
5229 return regcache_read_pc (®cache
);
5232 /* Read a requested block of memory from a trace frame. */
5235 traceframe_read_mem (int tfnum
, CORE_ADDR addr
,
5236 unsigned char *buf
, ULONGEST length
,
5239 struct traceframe
*tframe
;
5240 unsigned char *database
, *dataptr
;
5241 unsigned int datasize
;
5243 unsigned short mlen
;
5245 trace_debug ("traceframe_read_mem");
5247 tframe
= find_traceframe (tfnum
);
5251 trace_debug ("traceframe %d not found", tfnum
);
5255 datasize
= tframe
->data_size
;
5256 database
= dataptr
= &tframe
->data
[0];
5258 /* Iterate through a traceframe's blocks, looking for memory. */
5259 while ((dataptr
= traceframe_find_block_type (dataptr
,
5261 - (dataptr
- database
),
5262 tfnum
, 'M')) != NULL
)
5264 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5265 dataptr
+= sizeof (maddr
);
5266 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5267 dataptr
+= sizeof (mlen
);
5268 trace_debug ("traceframe %d has %d bytes at %s",
5269 tfnum
, mlen
, paddress (maddr
));
5271 /* If the block includes the first part of the desired range,
5272 return as much it has; GDB will re-request the remainder,
5273 which might be in a different block of this trace frame. */
5274 if (maddr
<= addr
&& addr
< (maddr
+ mlen
))
5276 ULONGEST amt
= (maddr
+ mlen
) - addr
;
5280 memcpy (buf
, dataptr
+ (addr
- maddr
), amt
);
5285 /* Skip over this block. */
5289 trace_debug ("traceframe %d has no memory data for the desired region",
5297 traceframe_read_tsv (int tsvnum
, LONGEST
*val
)
5300 struct traceframe
*tframe
;
5301 unsigned char *database
, *dataptr
;
5302 unsigned int datasize
;
5306 trace_debug ("traceframe_read_tsv");
5308 tfnum
= current_traceframe
;
5312 trace_debug ("no current traceframe");
5316 tframe
= find_traceframe (tfnum
);
5320 trace_debug ("traceframe %d not found", tfnum
);
5324 datasize
= tframe
->data_size
;
5325 database
= dataptr
= &tframe
->data
[0];
5327 /* Iterate through a traceframe's blocks, looking for the last
5329 while ((dataptr
= traceframe_find_block_type (dataptr
,
5331 - (dataptr
- database
),
5332 tfnum
, 'V')) != NULL
)
5334 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5335 dataptr
+= sizeof (vnum
);
5337 trace_debug ("traceframe %d has variable %d", tfnum
, vnum
);
5339 /* Check that this is the variable we want. */
5342 memcpy (val
, dataptr
, sizeof (*val
));
5346 /* Skip over this block. */
5347 dataptr
+= sizeof (LONGEST
);
5351 trace_debug ("traceframe %d has no data for variable %d",
5356 /* Read a requested block of static tracepoint data from a trace
5360 traceframe_read_sdata (int tfnum
, ULONGEST offset
,
5361 unsigned char *buf
, ULONGEST length
,
5364 struct traceframe
*tframe
;
5365 unsigned char *database
, *dataptr
;
5366 unsigned int datasize
;
5367 unsigned short mlen
;
5369 trace_debug ("traceframe_read_sdata");
5371 tframe
= find_traceframe (tfnum
);
5375 trace_debug ("traceframe %d not found", tfnum
);
5379 datasize
= tframe
->data_size
;
5380 database
= &tframe
->data
[0];
5382 /* Iterate through a traceframe's blocks, looking for static
5384 dataptr
= traceframe_find_block_type (database
, datasize
,
5386 if (dataptr
!= NULL
)
5388 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5389 dataptr
+= sizeof (mlen
);
5392 if (offset
+ length
> mlen
)
5393 length
= mlen
- offset
;
5395 memcpy (buf
, dataptr
, length
);
5403 trace_debug ("traceframe %d has no static trace data", tfnum
);
5409 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5410 object. DATA is pointer to a struct buffer holding the
5411 traceframe-info object being built. */
5414 build_traceframe_info_xml (char blocktype
, unsigned char *dataptr
, void *data
)
5416 struct buffer
*buffer
= data
;
5422 unsigned short mlen
;
5425 memcpy (&maddr
, dataptr
, sizeof (maddr
));
5426 dataptr
+= sizeof (maddr
);
5427 memcpy (&mlen
, dataptr
, sizeof (mlen
));
5428 dataptr
+= sizeof (mlen
);
5429 buffer_xml_printf (buffer
,
5430 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5431 paddress (maddr
), phex_nz (mlen
, sizeof (mlen
)));
5438 memcpy (&vnum
, dataptr
, sizeof (vnum
));
5439 buffer_xml_printf (buffer
, "<tvar id=\"%d\"/>\n", vnum
);
5448 warning ("Unhandled trace block type (%d) '%c ' "
5449 "while building trace frame info.",
5450 blocktype
, blocktype
);
5457 /* Build a traceframe-info object for traceframe number TFNUM into
5461 traceframe_read_info (int tfnum
, struct buffer
*buffer
)
5463 struct traceframe
*tframe
;
5465 trace_debug ("traceframe_read_info");
5467 tframe
= find_traceframe (tfnum
);
5471 trace_debug ("traceframe %d not found", tfnum
);
5475 buffer_grow_str (buffer
, "<traceframe-info>\n");
5476 traceframe_walk_blocks (tframe
->data
, tframe
->data_size
,
5477 tfnum
, build_traceframe_info_xml
, buffer
);
5478 buffer_grow_str0 (buffer
, "</traceframe-info>\n");
5482 /* Return the first fast tracepoint whose jump pad contains PC. */
5484 static struct tracepoint
*
5485 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc
)
5487 struct tracepoint
*tpoint
;
5489 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5490 if (tpoint
->type
== fast_tracepoint
)
5491 if (tpoint
->jump_pad
<= pc
&& pc
< tpoint
->jump_pad_end
)
5497 /* Return the first fast tracepoint whose trampoline contains PC. */
5499 static struct tracepoint
*
5500 fast_tracepoint_from_trampoline_address (CORE_ADDR pc
)
5502 struct tracepoint
*tpoint
;
5504 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5506 if (tpoint
->type
== fast_tracepoint
5507 && tpoint
->trampoline
<= pc
&& pc
< tpoint
->trampoline_end
)
5514 /* Return GDBserver's tracepoint that matches the IP Agent's
5515 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5518 static struct tracepoint
*
5519 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj
)
5521 struct tracepoint
*tpoint
;
5523 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
5524 if (tpoint
->type
== fast_tracepoint
)
5525 if (tpoint
->obj_addr_on_target
== ipa_tpoint_obj
)
5533 /* The type of the object that is used to synchronize fast tracepoint
5536 typedef struct collecting_t
5538 /* The fast tracepoint number currently collecting. */
5541 /* A number that GDBserver can use to identify the thread that is
5542 presently holding the collect lock. This need not (and usually
5543 is not) the thread id, as getting the current thread ID usually
5544 requires a system call, which we want to avoid like the plague.
5545 Usually this is thread's TCB, found in the TLS (pseudo-)
5546 register, which is readable with a single insn on several
5548 uintptr_t thread_area
;
5551 #ifndef IN_PROCESS_AGENT
5554 force_unlock_trace_buffer (void)
5556 write_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
, 0);
5559 /* Check if the thread identified by THREAD_AREA which is stopped at
5560 STOP_PC, is presently locking the fast tracepoint collection, and
5561 if so, gather some status of said collection. Returns 0 if the
5562 thread isn't collecting or in the jump pad at all. 1, if in the
5563 jump pad (or within gdb_collect) and hasn't executed the adjusted
5564 original insn yet (can set a breakpoint there and run to it). 2,
5565 if presently executing the adjusted original insn --- in which
5566 case, if we want to move the thread out of the jump pad, we need to
5567 single-step it until this function returns 0. */
5570 fast_tracepoint_collecting (CORE_ADDR thread_area
,
5572 struct fast_tpoint_collect_status
*status
)
5574 CORE_ADDR ipa_collecting
;
5575 CORE_ADDR ipa_gdb_jump_pad_buffer
, ipa_gdb_jump_pad_buffer_end
;
5576 CORE_ADDR ipa_gdb_trampoline_buffer
;
5577 CORE_ADDR ipa_gdb_trampoline_buffer_end
;
5578 struct tracepoint
*tpoint
;
5579 int needs_breakpoint
;
5581 /* The thread THREAD_AREA is either:
5583 0. not collecting at all, not within the jump pad, or within
5584 gdb_collect or one of its callees.
5586 1. in the jump pad and haven't reached gdb_collect
5588 2. within gdb_collect (out of the jump pad) (collect is set)
5590 3. we're in the jump pad, after gdb_collect having returned,
5591 possibly executing the adjusted insns.
5593 For cases 1 and 3, `collecting' may or not be set. The jump pad
5594 doesn't have any complicated jump logic, so we can tell if the
5595 thread is executing the adjust original insn or not by just
5596 matching STOP_PC with known jump pad addresses. If we it isn't
5597 yet executing the original insn, set a breakpoint there, and let
5598 the thread run to it, so to quickly step over a possible (many
5599 insns) gdb_collect call. Otherwise, or when the breakpoint is
5600 hit, only a few (small number of) insns are left to be executed
5601 in the jump pad. Single-step the thread until it leaves the
5606 needs_breakpoint
= 0;
5607 trace_debug ("fast_tracepoint_collecting");
5609 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer
,
5610 &ipa_gdb_jump_pad_buffer
))
5612 internal_error (__FILE__
, __LINE__
,
5613 "error extracting `gdb_jump_pad_buffer'");
5615 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_jump_pad_buffer_end
,
5616 &ipa_gdb_jump_pad_buffer_end
))
5618 internal_error (__FILE__
, __LINE__
,
5619 "error extracting `gdb_jump_pad_buffer_end'");
5622 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer
,
5623 &ipa_gdb_trampoline_buffer
))
5625 internal_error (__FILE__
, __LINE__
,
5626 "error extracting `gdb_trampoline_buffer'");
5628 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_trampoline_buffer_end
,
5629 &ipa_gdb_trampoline_buffer_end
))
5631 internal_error (__FILE__
, __LINE__
,
5632 "error extracting `gdb_trampoline_buffer_end'");
5635 if (ipa_gdb_jump_pad_buffer
<= stop_pc
5636 && stop_pc
< ipa_gdb_jump_pad_buffer_end
)
5638 /* We can tell which tracepoint(s) the thread is collecting by
5639 matching the jump pad address back to the tracepoint. */
5640 tpoint
= fast_tracepoint_from_jump_pad_address (stop_pc
);
5643 warning ("in jump pad, but no matching tpoint?");
5648 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5650 tpoint
->number
, paddress (tpoint
->address
),
5651 paddress (tpoint
->jump_pad
),
5652 paddress (tpoint
->jump_pad_end
),
5653 paddress (tpoint
->adjusted_insn_addr
),
5654 paddress (tpoint
->adjusted_insn_addr_end
));
5657 /* Definitely in the jump pad. May or may not need
5658 fast-exit-jump-pad breakpoint. */
5659 if (tpoint
->jump_pad
<= stop_pc
5660 && stop_pc
< tpoint
->adjusted_insn_addr
)
5661 needs_breakpoint
= 1;
5663 else if (ipa_gdb_trampoline_buffer
<= stop_pc
5664 && stop_pc
< ipa_gdb_trampoline_buffer_end
)
5666 /* We can tell which tracepoint(s) the thread is collecting by
5667 matching the trampoline address back to the tracepoint. */
5668 tpoint
= fast_tracepoint_from_trampoline_address (stop_pc
);
5671 warning ("in trampoline, but no matching tpoint?");
5676 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5677 tpoint
->number
, paddress (tpoint
->address
),
5678 paddress (tpoint
->trampoline
),
5679 paddress (tpoint
->trampoline_end
));
5682 /* Have not reached jump pad yet, but treat the trampoline as a
5683 part of the jump pad that is before the adjusted original
5685 needs_breakpoint
= 1;
5689 collecting_t ipa_collecting_obj
;
5691 /* If `collecting' is set/locked, then the THREAD_AREA thread
5692 may or not be the one holding the lock. We have to read the
5693 lock to find out. */
5695 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_collecting
,
5698 trace_debug ("fast_tracepoint_collecting:"
5699 " failed reading 'collecting' in the inferior");
5703 if (!ipa_collecting
)
5705 trace_debug ("fast_tracepoint_collecting: not collecting"
5706 " (and nobody is).");
5710 /* Some thread is collecting. Check which. */
5711 if (read_inferior_memory (ipa_collecting
,
5712 (unsigned char *) &ipa_collecting_obj
,
5713 sizeof (ipa_collecting_obj
)) != 0)
5716 if (ipa_collecting_obj
.thread_area
!= thread_area
)
5718 trace_debug ("fast_tracepoint_collecting: not collecting "
5719 "(another thread is)");
5724 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj
.tpoint
);
5727 warning ("fast_tracepoint_collecting: collecting, "
5728 "but tpoint %s not found?",
5729 paddress ((CORE_ADDR
) ipa_collecting_obj
.tpoint
));
5733 /* The thread is within `gdb_collect', skip over the rest of
5734 fast tracepoint collection quickly using a breakpoint. */
5735 needs_breakpoint
= 1;
5738 /* The caller wants a bit of status detail. */
5741 status
->tpoint_num
= tpoint
->number
;
5742 status
->tpoint_addr
= tpoint
->address
;
5743 status
->adjusted_insn_addr
= tpoint
->adjusted_insn_addr
;
5744 status
->adjusted_insn_addr_end
= tpoint
->adjusted_insn_addr_end
;
5747 if (needs_breakpoint
)
5749 /* Hasn't executed the original instruction yet. Set breakpoint
5750 there, and wait till it's hit, then single-step until exiting
5754 fast_tracepoint_collecting, returning continue-until-break at %s",
5755 paddress (tpoint
->adjusted_insn_addr
));
5757 return 1; /* continue */
5761 /* Just single-step until exiting the jump pad. */
5763 trace_debug ("fast_tracepoint_collecting, returning "
5764 "need-single-step (%s-%s)",
5765 paddress (tpoint
->adjusted_insn_addr
),
5766 paddress (tpoint
->adjusted_insn_addr_end
));
5768 return 2; /* single-step */
5774 #ifdef IN_PROCESS_AGENT
5776 /* The global fast tracepoint collect lock. Points to a collecting_t
5777 object built on the stack by the jump pad, if presently locked;
5778 NULL if it isn't locked. Note that this lock *must* be set while
5779 executing any *function other than the jump pad. See
5780 fast_tracepoint_collecting. */
5782 IP_AGENT_EXPORT_VAR collecting_t
*collecting
;
5785 /* This routine, called from the jump pad (in asm) is designed to be
5786 called from the jump pads of fast tracepoints, thus it is on the
5789 IP_AGENT_EXPORT_FUNC
void
5790 gdb_collect (struct tracepoint
*tpoint
, unsigned char *regs
)
5792 struct fast_tracepoint_ctx ctx
;
5794 /* Don't do anything until the trace run is completely set up. */
5798 ctx
.base
.type
= fast_tracepoint
;
5800 ctx
.regcache_initted
= 0;
5801 /* Wrap the regblock in a register cache (in the stack, we don't
5802 want to malloc here). */
5803 ctx
.regspace
= alloca (ipa_tdesc
->registers_size
);
5804 if (ctx
.regspace
== NULL
)
5806 trace_debug ("Trace buffer block allocation failed, skipping");
5810 for (ctx
.tpoint
= tpoint
;
5811 ctx
.tpoint
!= NULL
&& ctx
.tpoint
->address
== tpoint
->address
;
5812 ctx
.tpoint
= ctx
.tpoint
->next
)
5814 if (!ctx
.tpoint
->enabled
)
5817 /* Multiple tracepoints of different types, such as fast tracepoint and
5818 static tracepoint, can be set at the same address. */
5819 if (ctx
.tpoint
->type
!= tpoint
->type
)
5822 /* Test the condition if present, and collect if true. */
5823 if (ctx
.tpoint
->cond
== NULL
5824 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5827 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
5828 ctx
.tpoint
->address
, ctx
.tpoint
);
5830 /* Note that this will cause original insns to be written back
5831 to where we jumped from, but that's OK because we're jumping
5832 back to the next whole instruction. This will go badly if
5833 instruction restoration is not atomic though. */
5834 if (stopping_tracepoint
5835 || trace_buffer_is_full
5836 || expr_eval_result
!= expr_eval_no_error
)
5844 /* If there was a condition and it evaluated to false, the only
5845 way we would stop tracing is if there was an error during
5846 condition expression evaluation. */
5847 if (expr_eval_result
!= expr_eval_no_error
)
5858 #ifndef IN_PROCESS_AGENT
5861 get_raw_reg_func_addr (void)
5863 return ipa_sym_addrs
.addr_get_raw_reg
;
5867 get_get_tsv_func_addr (void)
5869 return ipa_sym_addrs
.addr_get_trace_state_variable_value
;
5873 get_set_tsv_func_addr (void)
5875 return ipa_sym_addrs
.addr_set_trace_state_variable_value
;
5879 compile_tracepoint_condition (struct tracepoint
*tpoint
,
5880 CORE_ADDR
*jump_entry
)
5882 CORE_ADDR entry_point
= *jump_entry
;
5883 enum eval_result_type err
;
5885 trace_debug ("Starting condition compilation for tracepoint %d\n",
5888 /* Initialize the global pointer to the code being built. */
5889 current_insn_ptr
= *jump_entry
;
5893 err
= compile_bytecodes (tpoint
->cond
);
5895 if (err
== expr_eval_no_error
)
5899 /* Record the beginning of the compiled code. */
5900 tpoint
->compiled_cond
= entry_point
;
5902 trace_debug ("Condition compilation for tracepoint %d complete\n",
5907 /* Leave the unfinished code in situ, but don't point to it. */
5909 tpoint
->compiled_cond
= 0;
5911 trace_debug ("Condition compilation for tracepoint %d failed, "
5913 tpoint
->number
, err
);
5916 /* Update the code pointer passed in. Note that we do this even if
5917 the compile fails, so that we can look at the partial results
5918 instead of letting them be overwritten. */
5919 *jump_entry
= current_insn_ptr
;
5921 /* Leave a gap, to aid dump decipherment. */
5925 /* We'll need to adjust these when we consider bi-arch setups, and big
5929 write_inferior_data_ptr (CORE_ADDR where
, CORE_ADDR ptr
)
5931 return write_inferior_memory (where
,
5932 (unsigned char *) &ptr
, sizeof (void *));
5935 /* The base pointer of the IPA's heap. This is the only memory the
5936 IPA is allowed to use. The IPA should _not_ call the inferior's
5937 `malloc' during operation. That'd be slow, and, most importantly,
5938 it may not be safe. We may be collecting a tracepoint in a signal
5939 handler, for example. */
5940 static CORE_ADDR target_tp_heap
;
5942 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5946 target_malloc (ULONGEST size
)
5950 if (target_tp_heap
== 0)
5952 /* We have the pointer *address*, need what it points to. */
5953 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_gdb_tp_heap_buffer
,
5956 internal_error (__FILE__
, __LINE__
,
5957 "couldn't get target heap head pointer");
5961 ptr
= target_tp_heap
;
5962 target_tp_heap
+= size
;
5964 /* Pad to 8-byte alignment. */
5965 target_tp_heap
= ((target_tp_heap
+ 7) & ~0x7);
5971 download_agent_expr (struct agent_expr
*expr
)
5973 CORE_ADDR expr_addr
;
5974 CORE_ADDR expr_bytes
;
5976 expr_addr
= target_malloc (sizeof (*expr
));
5977 write_inferior_memory (expr_addr
, (unsigned char *) expr
, sizeof (*expr
));
5979 expr_bytes
= target_malloc (expr
->length
);
5980 write_inferior_data_ptr (expr_addr
+ offsetof (struct agent_expr
, bytes
),
5982 write_inferior_memory (expr_bytes
, expr
->bytes
, expr
->length
);
5987 /* Align V up to N bits. */
5988 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5990 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5993 download_tracepoint_1 (struct tracepoint
*tpoint
)
5995 struct tracepoint target_tracepoint
;
5996 CORE_ADDR tpptr
= 0;
5998 gdb_assert (tpoint
->type
== fast_tracepoint
5999 || tpoint
->type
== static_tracepoint
);
6001 if (tpoint
->cond
!= NULL
&& target_emit_ops () != NULL
)
6003 CORE_ADDR jentry
, jump_entry
;
6005 jentry
= jump_entry
= get_jump_space_head ();
6007 if (tpoint
->cond
!= NULL
)
6009 /* Pad to 8-byte alignment. (needed?) */
6010 /* Actually this should be left for the target to
6012 jentry
= UALIGN (jentry
, 8);
6014 compile_tracepoint_condition (tpoint
, &jentry
);
6017 /* Pad to 8-byte alignment. */
6018 jentry
= UALIGN (jentry
, 8);
6019 claim_jump_space (jentry
- jump_entry
);
6022 target_tracepoint
= *tpoint
;
6024 tpptr
= target_malloc (sizeof (*tpoint
));
6025 tpoint
->obj_addr_on_target
= tpptr
;
6027 /* Write the whole object. We'll fix up its pointers in a bit.
6028 Assume no next for now. This is fixed up above on the next
6029 iteration, if there's any. */
6030 target_tracepoint
.next
= NULL
;
6031 /* Need to clear this here too, since we're downloading the
6032 tracepoints before clearing our own copy. */
6033 target_tracepoint
.hit_count
= 0;
6035 write_inferior_memory (tpptr
, (unsigned char *) &target_tracepoint
,
6036 sizeof (target_tracepoint
));
6039 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
6041 download_agent_expr (tpoint
->cond
));
6043 if (tpoint
->numactions
)
6046 CORE_ADDR actions_array
;
6048 /* The pointers array. */
6050 = target_malloc (sizeof (*tpoint
->actions
) * tpoint
->numactions
);
6051 write_inferior_data_ptr (tpptr
+ offsetof (struct tracepoint
,
6055 /* Now for each pointer, download the action. */
6056 for (i
= 0; i
< tpoint
->numactions
; i
++)
6058 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6059 CORE_ADDR ipa_action
= action
->ops
->download (action
);
6061 if (ipa_action
!= 0)
6062 write_inferior_data_ptr
6063 (actions_array
+ i
* sizeof (*tpoint
->actions
),
6069 #define IPA_PROTO_FAST_TRACE_FLAG 0
6070 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
6071 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
6072 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
6073 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
6075 /* Send a command to agent to download and install tracepoint TPOINT. */
6078 tracepoint_send_agent (struct tracepoint
*tpoint
)
6080 char buf
[IPA_CMD_BUF_SIZE
];
6085 strcpy (p
, "FastTrace:");
6088 COPY_FIELD_TO_BUF (p
, tpoint
, number
);
6089 COPY_FIELD_TO_BUF (p
, tpoint
, address
);
6090 COPY_FIELD_TO_BUF (p
, tpoint
, type
);
6091 COPY_FIELD_TO_BUF (p
, tpoint
, enabled
);
6092 COPY_FIELD_TO_BUF (p
, tpoint
, step_count
);
6093 COPY_FIELD_TO_BUF (p
, tpoint
, pass_count
);
6094 COPY_FIELD_TO_BUF (p
, tpoint
, numactions
);
6095 COPY_FIELD_TO_BUF (p
, tpoint
, hit_count
);
6096 COPY_FIELD_TO_BUF (p
, tpoint
, traceframe_usage
);
6097 COPY_FIELD_TO_BUF (p
, tpoint
, compiled_cond
);
6098 COPY_FIELD_TO_BUF (p
, tpoint
, orig_size
);
6101 p
= agent_expr_send (p
, tpoint
->cond
);
6103 /* tracepoint_action */
6104 for (i
= 0; i
< tpoint
->numactions
; i
++)
6106 struct tracepoint_action
*action
= tpoint
->actions
[i
];
6108 p
[0] = action
->type
;
6109 p
= action
->ops
->send (&p
[1], action
);
6112 get_jump_space_head ();
6113 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6114 agent can use jump pad from it. */
6115 if (tpoint
->type
== fast_tracepoint
)
6117 memcpy (p
, &gdb_jump_pad_head
, 8);
6121 ret
= run_inferior_command (buf
, (int) (ptrdiff_t) (p
- buf
));
6125 if (!startswith (buf
, "OK"))
6128 /* The value of tracepoint's target address is stored in BUF. */
6129 memcpy (&tpoint
->obj_addr_on_target
,
6130 &buf
[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET
], 8);
6132 if (tpoint
->type
== fast_tracepoint
)
6135 = (unsigned char *) &buf
[IPA_PROTO_FAST_TRACE_FJUMP_INSN
];
6138 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6139 (unsigned int) tpoint
->obj_addr_on_target
,
6140 (unsigned int) gdb_jump_pad_head
);
6142 memcpy (&gdb_jump_pad_head
, &buf
[IPA_PROTO_FAST_TRACE_JUMP_PAD
], 8);
6144 /* This has been done in agent. We should also set up record for it. */
6145 memcpy (&fjump_size
, &buf
[IPA_PROTO_FAST_TRACE_FJUMP_SIZE
], 4);
6148 = set_fast_tracepoint_jump (tpoint
->address
, insn
, fjump_size
);
6155 download_tracepoint (struct tracepoint
*tpoint
)
6157 struct tracepoint
*tp
, *tp_prev
;
6159 if (tpoint
->type
!= fast_tracepoint
6160 && tpoint
->type
!= static_tracepoint
)
6163 download_tracepoint_1 (tpoint
);
6165 /* Find the previous entry of TPOINT, which is fast tracepoint or
6166 static tracepoint. */
6168 for (tp
= tracepoints
; tp
!= tpoint
; tp
= tp
->next
)
6170 if (tp
->type
== fast_tracepoint
|| tp
->type
== static_tracepoint
)
6176 CORE_ADDR tp_prev_target_next_addr
;
6178 /* Insert TPOINT after TP_PREV in IPA. */
6179 if (read_inferior_data_pointer (tp_prev
->obj_addr_on_target
6180 + offsetof (struct tracepoint
, next
),
6181 &tp_prev_target_next_addr
))
6183 internal_error (__FILE__
, __LINE__
,
6184 "error reading `tp_prev->next'");
6187 /* tpoint->next = tp_prev->next */
6188 write_inferior_data_ptr (tpoint
->obj_addr_on_target
6189 + offsetof (struct tracepoint
, next
),
6190 tp_prev_target_next_addr
);
6191 /* tp_prev->next = tpoint */
6192 write_inferior_data_ptr (tp_prev
->obj_addr_on_target
6193 + offsetof (struct tracepoint
, next
),
6194 tpoint
->obj_addr_on_target
);
6197 /* First object in list, set the head pointer in the
6199 write_inferior_data_ptr (ipa_sym_addrs
.addr_tracepoints
,
6200 tpoint
->obj_addr_on_target
);
6205 download_trace_state_variables (void)
6207 CORE_ADDR ptr
= 0, prev_ptr
= 0;
6208 struct trace_state_variable
*tsv
;
6210 /* Start out empty. */
6211 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
, 0);
6213 for (tsv
= trace_state_variables
; tsv
!= NULL
; tsv
= tsv
->next
)
6215 struct trace_state_variable target_tsv
;
6217 /* TSV's with a getter have been initialized equally in both the
6218 inferior and GDBserver. Skip them. */
6219 if (tsv
->getter
!= NULL
)
6225 ptr
= target_malloc (sizeof (*tsv
));
6227 if (tsv
== trace_state_variables
)
6229 /* First object in list, set the head pointer in the
6232 write_inferior_data_ptr (ipa_sym_addrs
.addr_trace_state_variables
,
6237 write_inferior_data_ptr (prev_ptr
6238 + offsetof (struct trace_state_variable
,
6243 /* Write the whole object. We'll fix up its pointers in a bit.
6244 Assume no next, fixup when needed. */
6245 target_tsv
.next
= NULL
;
6247 write_inferior_memory (ptr
, (unsigned char *) &target_tsv
,
6248 sizeof (target_tsv
));
6250 if (tsv
->name
!= NULL
)
6252 size_t size
= strlen (tsv
->name
) + 1;
6253 CORE_ADDR name_addr
= target_malloc (size
);
6254 write_inferior_memory (name_addr
,
6255 (unsigned char *) tsv
->name
, size
);
6256 write_inferior_data_ptr (ptr
6257 + offsetof (struct trace_state_variable
,
6262 gdb_assert (tsv
->getter
== NULL
);
6267 /* Fixup the next pointer in the last item in the list. */
6268 write_inferior_data_ptr (prev_ptr
6269 + offsetof (struct trace_state_variable
,
6274 /* Upload complete trace frames out of the IP Agent's trace buffer
6275 into GDBserver's trace buffer. This always uploads either all or
6276 no trace frames. This is the counter part of
6277 `trace_alloc_trace_buffer'. See its description of the atomic
6278 synching mechanism. */
6281 upload_fast_traceframes (void)
6283 unsigned int ipa_traceframe_read_count
, ipa_traceframe_write_count
;
6284 unsigned int ipa_traceframe_read_count_racy
, ipa_traceframe_write_count_racy
;
6286 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl
;
6287 unsigned int curr_tbctrl_idx
;
6288 unsigned int ipa_trace_buffer_ctrl_curr
;
6289 unsigned int ipa_trace_buffer_ctrl_curr_old
;
6290 CORE_ADDR ipa_trace_buffer_ctrl_addr
;
6291 struct breakpoint
*about_to_request_buffer_space_bkpt
;
6292 CORE_ADDR ipa_trace_buffer_lo
;
6293 CORE_ADDR ipa_trace_buffer_hi
;
6295 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6296 &ipa_traceframe_read_count_racy
))
6298 /* This will happen in most targets if the current thread is
6303 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6304 &ipa_traceframe_write_count_racy
))
6307 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6308 ipa_traceframe_write_count_racy
6309 - ipa_traceframe_read_count_racy
,
6310 ipa_traceframe_write_count_racy
,
6311 ipa_traceframe_read_count_racy
);
6313 if (ipa_traceframe_write_count_racy
== ipa_traceframe_read_count_racy
)
6316 about_to_request_buffer_space_bkpt
6317 = set_breakpoint_at (ipa_sym_addrs
.addr_about_to_request_buffer_space
,
6320 if (read_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6321 &ipa_trace_buffer_ctrl_curr
))
6324 ipa_trace_buffer_ctrl_curr_old
= ipa_trace_buffer_ctrl_curr
;
6326 curr_tbctrl_idx
= ipa_trace_buffer_ctrl_curr
& ~GDBSERVER_FLUSH_COUNT_MASK
;
6329 unsigned int prev
, counter
;
6331 /* Update the token, with new counters, and the GDBserver stamp
6332 bit. Alway reuse the current TBC index. */
6333 prev
= ipa_trace_buffer_ctrl_curr
& GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6334 counter
= (prev
+ 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR
;
6336 ipa_trace_buffer_ctrl_curr
= (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6342 if (write_inferior_uinteger (ipa_sym_addrs
.addr_trace_buffer_ctrl_curr
,
6343 ipa_trace_buffer_ctrl_curr
))
6346 trace_debug ("Lib: Committed %08x -> %08x",
6347 ipa_trace_buffer_ctrl_curr_old
,
6348 ipa_trace_buffer_ctrl_curr
);
6350 /* Re-read these, now that we've installed the
6351 `about_to_request_buffer_space' breakpoint/lock. A thread could
6352 have finished a traceframe between the last read of these
6353 counters and setting the breakpoint above. If we start
6354 uploading, we never want to leave this function with
6355 traceframe_read_count != 0, otherwise, GDBserver could end up
6356 incrementing the counter tokens more than once (due to event loop
6357 nesting), which would break the IP agent's "effective" detection
6358 (see trace_alloc_trace_buffer). */
6359 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_read_count
,
6360 &ipa_traceframe_read_count
))
6362 if (read_inferior_uinteger (ipa_sym_addrs
.addr_traceframe_write_count
,
6363 &ipa_traceframe_write_count
))
6368 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6369 ipa_traceframe_write_count
- ipa_traceframe_read_count
,
6370 ipa_traceframe_write_count
, ipa_traceframe_read_count
);
6372 if (ipa_traceframe_write_count
!= ipa_traceframe_write_count_racy
6373 || ipa_traceframe_read_count
!= ipa_traceframe_read_count_racy
)
6374 trace_debug ("note that ipa_traceframe_count's parts changed");
6377 /* Get the address of the current TBC object (the IP agent has an
6378 array of 3 such objects). The index is stored in the TBC
6380 ipa_trace_buffer_ctrl_addr
= ipa_sym_addrs
.addr_trace_buffer_ctrl
;
6381 ipa_trace_buffer_ctrl_addr
6382 += sizeof (struct ipa_trace_buffer_control
) * curr_tbctrl_idx
;
6384 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6385 (unsigned char *) &ipa_trace_buffer_ctrl
,
6386 sizeof (struct ipa_trace_buffer_control
)))
6389 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_lo
,
6390 &ipa_trace_buffer_lo
))
6392 if (read_inferior_data_pointer (ipa_sym_addrs
.addr_trace_buffer_hi
,
6393 &ipa_trace_buffer_hi
))
6396 /* Offsets are easier to grok for debugging than raw addresses,
6397 especially for the small trace buffer sizes that are useful for
6399 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6400 "endfree=%d wrap=%d hi=%d",
6402 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6403 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6404 (int) (ipa_trace_buffer_ctrl
.end_free
- ipa_trace_buffer_lo
),
6405 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6406 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6408 /* Note that the IPA's buffer is always circular. */
6410 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6412 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6413 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6415 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6416 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6417 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6418 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6421 tf
= IPA_FIRST_TRACEFRAME ();
6423 while (ipa_traceframe_write_count
- ipa_traceframe_read_count
)
6425 struct tracepoint
*tpoint
;
6426 struct traceframe
*tframe
;
6427 unsigned char *block
;
6428 struct traceframe ipa_tframe
;
6430 if (read_inferior_memory (tf
, (unsigned char *) &ipa_tframe
,
6431 offsetof (struct traceframe
, data
)))
6432 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf
));
6434 if (ipa_tframe
.tpnum
== 0)
6436 internal_error (__FILE__
, __LINE__
,
6437 "Uploading: No (more) fast traceframes, but"
6438 " ipa_traceframe_count == %u??\n",
6439 ipa_traceframe_write_count
6440 - ipa_traceframe_read_count
);
6443 /* Note that this will be incorrect for multi-location
6445 tpoint
= find_next_tracepoint_by_number (NULL
, ipa_tframe
.tpnum
);
6447 tframe
= add_traceframe (tpoint
);
6450 trace_buffer_is_full
= 1;
6451 trace_debug ("Uploading: trace buffer is full");
6455 /* Copy the whole set of blocks in one go for now. FIXME:
6456 split this in smaller blocks. */
6457 block
= add_traceframe_block (tframe
, tpoint
,
6458 ipa_tframe
.data_size
);
6461 if (read_inferior_memory (tf
6462 + offsetof (struct traceframe
, data
),
6463 block
, ipa_tframe
.data_size
))
6464 error ("Uploading: Couldn't read traceframe data at %s\n",
6465 paddress (tf
+ offsetof (struct traceframe
, data
)));
6468 trace_debug ("Uploading: traceframe didn't fit");
6469 finish_traceframe (tframe
);
6472 tf
= IPA_NEXT_TRACEFRAME (tf
, &ipa_tframe
);
6474 /* If we freed the traceframe that wrapped around, go back
6475 to the non-wrap case. */
6476 if (tf
< ipa_trace_buffer_ctrl
.start
)
6478 trace_debug ("Lib: Discarding past the wraparound");
6479 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6481 ipa_trace_buffer_ctrl
.start
= tf
;
6482 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_ctrl
.start
;
6483 ++ipa_traceframe_read_count
;
6485 if (ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.free
6486 && ipa_trace_buffer_ctrl
.start
== ipa_trace_buffer_ctrl
.end_free
)
6488 trace_debug ("Lib: buffer is fully empty. "
6489 "Trace buffer [%d] start=%d free=%d endfree=%d",
6491 (int) (ipa_trace_buffer_ctrl
.start
6492 - ipa_trace_buffer_lo
),
6493 (int) (ipa_trace_buffer_ctrl
.free
6494 - ipa_trace_buffer_lo
),
6495 (int) (ipa_trace_buffer_ctrl
.end_free
6496 - ipa_trace_buffer_lo
));
6498 ipa_trace_buffer_ctrl
.start
= ipa_trace_buffer_lo
;
6499 ipa_trace_buffer_ctrl
.free
= ipa_trace_buffer_lo
;
6500 ipa_trace_buffer_ctrl
.end_free
= ipa_trace_buffer_hi
;
6501 ipa_trace_buffer_ctrl
.wrap
= ipa_trace_buffer_hi
;
6504 trace_debug ("Uploaded a traceframe\n"
6505 "Lib: Trace buffer [%d] start=%d free=%d "
6506 "endfree=%d wrap=%d hi=%d",
6508 (int) (ipa_trace_buffer_ctrl
.start
- ipa_trace_buffer_lo
),
6509 (int) (ipa_trace_buffer_ctrl
.free
- ipa_trace_buffer_lo
),
6510 (int) (ipa_trace_buffer_ctrl
.end_free
6511 - ipa_trace_buffer_lo
),
6512 (int) (ipa_trace_buffer_ctrl
.wrap
- ipa_trace_buffer_lo
),
6513 (int) (ipa_trace_buffer_hi
- ipa_trace_buffer_lo
));
6516 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr
,
6517 (unsigned char *) &ipa_trace_buffer_ctrl
,
6518 sizeof (struct ipa_trace_buffer_control
)))
6521 write_inferior_integer (ipa_sym_addrs
.addr_traceframe_read_count
,
6522 ipa_traceframe_read_count
);
6524 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx
);
6528 delete_breakpoint (about_to_request_buffer_space_bkpt
);
6529 about_to_request_buffer_space_bkpt
= NULL
;
6533 if (trace_buffer_is_full
)
6538 #ifdef IN_PROCESS_AGENT
6540 IP_AGENT_EXPORT_VAR
int ust_loaded
;
6541 IP_AGENT_EXPORT_VAR
char cmd_buf
[IPA_CMD_BUF_SIZE
];
6545 /* Static tracepoints. */
6547 /* UST puts a "struct tracepoint" in the global namespace, which
6548 conflicts with our tracepoint. Arguably, being a library, it
6549 shouldn't take ownership of such a generic name. We work around it
6551 #define tracepoint ust_tracepoint
6552 #include <ust/ust.h>
6555 extern int serialize_to_text (char *outbuf
, int bufsize
,
6556 const char *fmt
, va_list ap
);
6558 #define GDB_PROBE_NAME "gdb"
6560 /* We dynamically search for the UST symbols instead of linking them
6561 in. This lets the user decide if the application uses static
6562 tracepoints, instead of always pulling libust.so in. This vector
6563 holds pointers to all functions we care about. */
6567 int (*serialize_to_text
) (char *outbuf
, int bufsize
,
6568 const char *fmt
, va_list ap
);
6570 int (*ltt_probe_register
) (struct ltt_available_probe
*pdata
);
6571 int (*ltt_probe_unregister
) (struct ltt_available_probe
*pdata
);
6573 int (*ltt_marker_connect
) (const char *channel
, const char *mname
,
6575 int (*ltt_marker_disconnect
) (const char *channel
, const char *mname
,
6578 void (*marker_iter_start
) (struct marker_iter
*iter
);
6579 void (*marker_iter_next
) (struct marker_iter
*iter
);
6580 void (*marker_iter_stop
) (struct marker_iter
*iter
);
6581 void (*marker_iter_reset
) (struct marker_iter
*iter
);
6586 /* Cast through typeof to catch incompatible API changes. Since UST
6587 only builds with gcc, we can freely use gcc extensions here
6589 #define GET_UST_SYM(SYM) \
6592 if (ust_ops.SYM == NULL) \
6593 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6594 if (ust_ops.SYM == NULL) \
6598 #define USTF(SYM) ust_ops.SYM
6600 /* Get pointers to all libust.so functions we care about. */
6605 GET_UST_SYM (serialize_to_text
);
6607 GET_UST_SYM (ltt_probe_register
);
6608 GET_UST_SYM (ltt_probe_unregister
);
6609 GET_UST_SYM (ltt_marker_connect
);
6610 GET_UST_SYM (ltt_marker_disconnect
);
6612 GET_UST_SYM (marker_iter_start
);
6613 GET_UST_SYM (marker_iter_next
);
6614 GET_UST_SYM (marker_iter_stop
);
6615 GET_UST_SYM (marker_iter_reset
);
6621 /* Given an UST marker, return the matching gdb static tracepoint.
6622 The match is done by address. */
6624 static struct tracepoint
*
6625 ust_marker_to_static_tracepoint (const struct marker
*mdata
)
6627 struct tracepoint
*tpoint
;
6629 for (tpoint
= tracepoints
; tpoint
; tpoint
= tpoint
->next
)
6631 if (tpoint
->type
!= static_tracepoint
)
6634 if (tpoint
->address
== (uintptr_t) mdata
->location
)
6641 /* The probe function we install on lttng/ust markers. Whenever a
6642 probed ust marker is hit, this function is called. This is similar
6643 to gdb_collect, only for static tracepoints, instead of fast
6647 gdb_probe (const struct marker
*mdata
, void *probe_private
,
6648 struct registers
*regs
, void *call_private
,
6649 const char *fmt
, va_list *args
)
6651 struct tracepoint
*tpoint
;
6652 struct static_tracepoint_ctx ctx
;
6654 /* Don't do anything until the trace run is completely set up. */
6657 trace_debug ("gdb_probe: not tracing\n");
6661 ctx
.base
.type
= static_tracepoint
;
6662 ctx
.regcache_initted
= 0;
6667 /* Wrap the regblock in a register cache (in the stack, we don't
6668 want to malloc here). */
6669 ctx
.regspace
= alloca (ipa_tdesc
->registers_size
);
6670 if (ctx
.regspace
== NULL
)
6672 trace_debug ("Trace buffer block allocation failed, skipping");
6676 tpoint
= ust_marker_to_static_tracepoint (mdata
);
6679 trace_debug ("gdb_probe: marker not known: "
6680 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6681 mdata
->location
, mdata
->channel
,
6682 mdata
->name
, mdata
->format
);
6686 if (!tpoint
->enabled
)
6688 trace_debug ("gdb_probe: tracepoint disabled");
6692 ctx
.tpoint
= tpoint
;
6694 trace_debug ("gdb_probe: collecting marker: "
6695 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6696 mdata
->location
, mdata
->channel
,
6697 mdata
->name
, mdata
->format
);
6699 /* Test the condition if present, and collect if true. */
6700 if (tpoint
->cond
== NULL
6701 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6704 collect_data_at_tracepoint ((struct tracepoint_hit_ctx
*) &ctx
,
6705 tpoint
->address
, tpoint
);
6707 if (stopping_tracepoint
6708 || trace_buffer_is_full
6709 || expr_eval_result
!= expr_eval_no_error
)
6714 /* If there was a condition and it evaluated to false, the only
6715 way we would stop tracing is if there was an error during
6716 condition expression evaluation. */
6717 if (expr_eval_result
!= expr_eval_no_error
)
6722 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6723 static tracepoint string data. This is a string passed to the
6724 tracing library by the user, at the time of the tracepoint marker
6725 call. E.g., in the UST marker call:
6727 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6729 the collected data is "str FOOBAZ".
6733 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx
*ctx
,
6734 struct traceframe
*tframe
)
6736 struct static_tracepoint_ctx
*umd
= (struct static_tracepoint_ctx
*) ctx
;
6737 unsigned char *bufspace
;
6740 unsigned short blocklen
;
6744 trace_debug ("Wanted to collect static trace data, "
6745 "but there's no static trace data");
6749 va_copy (copy
, *umd
->args
);
6750 size
= USTF(serialize_to_text
) (NULL
, 0, umd
->fmt
, copy
);
6753 trace_debug ("Want to collect ust data");
6755 /* 'S' + size + string */
6756 bufspace
= add_traceframe_block (tframe
, umd
->tpoint
,
6757 1 + sizeof (blocklen
) + size
+ 1);
6758 if (bufspace
== NULL
)
6760 trace_debug ("Trace buffer block allocation failed, skipping");
6764 /* Identify a static trace data block. */
6767 blocklen
= size
+ 1;
6768 memcpy (bufspace
+ 1, &blocklen
, sizeof (blocklen
));
6770 va_copy (copy
, *umd
->args
);
6771 USTF(serialize_to_text
) ((char *) bufspace
+ 1 + sizeof (blocklen
),
6772 size
+ 1, umd
->fmt
, copy
);
6775 trace_debug ("Storing static tracepoint data in regblock: %s",
6776 bufspace
+ 1 + sizeof (blocklen
));
6779 /* The probe to register with lttng/ust. */
6780 static struct ltt_available_probe gdb_ust_probe
=
6787 #endif /* HAVE_UST */
6788 #endif /* IN_PROCESS_AGENT */
6790 #ifndef IN_PROCESS_AGENT
6792 /* Ask the in-process agent to run a command. Since we don't want to
6793 have to handle the IPA hitting breakpoints while running the
6794 command, we pause all threads, remove all breakpoints, and then set
6795 the helper thread re-running. We communicate with the helper
6796 thread by means of direct memory xfering, and a socket for
6800 run_inferior_command (char *cmd
, int len
)
6803 int pid
= ptid_get_pid (current_ptid
);
6805 trace_debug ("run_inferior_command: running: %s", cmd
);
6808 uninsert_all_breakpoints ();
6810 err
= agent_run_command (pid
, (const char *) cmd
, len
);
6812 reinsert_all_breakpoints ();
6818 #else /* !IN_PROCESS_AGENT */
6820 #include <sys/socket.h>
6823 #ifndef UNIX_PATH_MAX
6824 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6827 /* Where we put the socked used for synchronization. */
6828 #define SOCK_DIR P_tmpdir
6830 /* Thread ID of the helper thread. GDBserver reads this to know which
6831 is the help thread. This is an LWP id on Linux. */
6833 IP_AGENT_EXPORT_VAR
int helper_thread_id
;
6837 init_named_socket (const char *name
)
6840 struct sockaddr_un addr
;
6842 result
= fd
= socket (PF_UNIX
, SOCK_STREAM
, 0);
6845 warning ("socket creation failed: %s", strerror (errno
));
6849 addr
.sun_family
= AF_UNIX
;
6851 strncpy (addr
.sun_path
, name
, UNIX_PATH_MAX
);
6852 addr
.sun_path
[UNIX_PATH_MAX
- 1] = '\0';
6854 result
= access (name
, F_OK
);
6858 result
= unlink (name
);
6861 warning ("unlink failed: %s", strerror (errno
));
6865 warning ("socket %s already exists; overwriting", name
);
6868 result
= bind (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
6871 warning ("bind failed: %s", strerror (errno
));
6876 result
= listen (fd
, 1);
6879 warning ("listen: %s", strerror (errno
));
6887 static char agent_socket_name
[UNIX_PATH_MAX
];
6890 gdb_agent_socket_init (void)
6894 result
= xsnprintf (agent_socket_name
, UNIX_PATH_MAX
, "%s/gdb_ust%d",
6895 SOCK_DIR
, getpid ());
6896 if (result
>= UNIX_PATH_MAX
)
6898 trace_debug ("string overflow allocating socket name");
6902 fd
= init_named_socket (agent_socket_name
);
6904 warning ("Error initializing named socket (%s) for communication with the "
6905 "ust helper thread. Check that directory exists and that it "
6906 "is writable.", agent_socket_name
);
6913 /* The next marker to be returned on a qTsSTM command. */
6914 static const struct marker
*next_st
;
6916 /* Returns the first known marker. */
6921 struct marker_iter iter
;
6923 USTF(marker_iter_reset
) (&iter
);
6924 USTF(marker_iter_start
) (&iter
);
6929 /* Returns the marker following M. */
6931 const struct marker
*
6932 next_marker (const struct marker
*m
)
6934 struct marker_iter iter
;
6936 USTF(marker_iter_reset
) (&iter
);
6937 USTF(marker_iter_start
) (&iter
);
6939 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
6941 if (iter
.marker
== m
)
6943 USTF(marker_iter_next
) (&iter
);
6951 /* Return an hexstr version of the STR C string, fit for sending to
6955 cstr_to_hexstr (const char *str
)
6957 int len
= strlen (str
);
6958 char *hexstr
= xmalloc (len
* 2 + 1);
6959 bin2hex ((gdb_byte
*) str
, hexstr
, len
);
6963 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6967 response_ust_marker (char *packet
, const struct marker
*st
)
6969 char *strid
, *format
, *tmp
;
6971 next_st
= next_marker (st
);
6973 tmp
= xmalloc (strlen (st
->channel
) + 1 +
6974 strlen (st
->name
) + 1);
6975 sprintf (tmp
, "%s/%s", st
->channel
, st
->name
);
6977 strid
= cstr_to_hexstr (tmp
);
6980 format
= cstr_to_hexstr (st
->format
);
6982 sprintf (packet
, "m%s:%s:%s",
6983 paddress ((uintptr_t) st
->location
),
6991 /* Return the first static tracepoint, and initialize the state
6992 machine that will iterate through all the static tracepoints. */
6995 cmd_qtfstm (char *packet
)
6997 trace_debug ("Returning first trace state variable definition");
6999 if (first_marker ())
7000 response_ust_marker (packet
, first_marker ());
7002 strcpy (packet
, "l");
7005 /* Return additional trace state variable definitions. */
7008 cmd_qtsstm (char *packet
)
7010 trace_debug ("Returning static tracepoint");
7013 response_ust_marker (packet
, next_st
);
7015 strcpy (packet
, "l");
7018 /* Disconnect the GDB probe from a marker at a given address. */
7021 unprobe_marker_at (char *packet
)
7025 struct marker_iter iter
;
7027 p
+= sizeof ("unprobe_marker_at:") - 1;
7029 p
= unpack_varlen_hex (p
, &address
);
7031 USTF(marker_iter_reset
) (&iter
);
7032 USTF(marker_iter_start
) (&iter
);
7033 for (; iter
.marker
!= NULL
; USTF(marker_iter_next
) (&iter
))
7034 if ((uintptr_t ) iter
.marker
->location
== address
)
7038 result
= USTF(ltt_marker_disconnect
) (iter
.marker
->channel
,
7042 warning ("could not disable marker %s/%s",
7043 iter
.marker
->channel
, iter
.marker
->name
);
7048 /* Connect the GDB probe to a marker at a given address. */
7051 probe_marker_at (char *packet
)
7055 struct marker_iter iter
;
7058 p
+= sizeof ("probe_marker_at:") - 1;
7060 p
= unpack_varlen_hex (p
, &address
);
7062 USTF(marker_iter_reset
) (&iter
);
7064 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7066 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7067 if ((uintptr_t ) m
->location
== address
)
7071 trace_debug ("found marker for address. "
7072 "ltt_marker_connect (marker = %s/%s)",
7073 m
->channel
, m
->name
);
7075 result
= USTF(ltt_marker_connect
) (m
->channel
, m
->name
,
7077 if (result
&& result
!= -EEXIST
)
7078 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
7079 m
->channel
, m
->name
, -result
);
7083 sprintf (packet
, "E.could not connect marker: channel=%s, name=%s",
7084 m
->channel
, m
->name
);
7088 strcpy (packet
, "OK");
7092 sprintf (packet
, "E.no marker found at 0x%s", paddress (address
));
7097 cmd_qtstmat (char *packet
)
7101 struct marker_iter iter
;
7104 p
+= sizeof ("qTSTMat:") - 1;
7106 p
= unpack_varlen_hex (p
, &address
);
7108 USTF(marker_iter_reset
) (&iter
);
7110 for (USTF(marker_iter_start
) (&iter
), m
= iter
.marker
;
7112 USTF(marker_iter_next
) (&iter
), m
= iter
.marker
)
7113 if ((uintptr_t ) m
->location
== address
)
7115 response_ust_marker (packet
, m
);
7119 strcpy (packet
, "l");
7129 USTF(ltt_probe_register
) (&gdb_ust_probe
);
7132 #endif /* HAVE_UST */
7134 #include <sys/syscall.h>
7137 gdb_agent_remove_socket (void)
7139 unlink (agent_socket_name
);
7142 /* Helper thread of agent. */
7145 gdb_agent_helper_thread (void *arg
)
7149 atexit (gdb_agent_remove_socket
);
7153 listen_fd
= gdb_agent_socket_init ();
7155 if (helper_thread_id
== 0)
7156 helper_thread_id
= syscall (SYS_gettid
);
7158 if (listen_fd
== -1)
7160 warning ("could not create sync socket\n");
7167 struct sockaddr_un sockaddr
;
7173 tmp
= sizeof (sockaddr
);
7177 fd
= accept (listen_fd
, (struct sockaddr
*) &sockaddr
, &tmp
);
7179 /* It seems an ERESTARTSYS can escape out of accept. */
7180 while (fd
== -512 || (fd
== -1 && errno
== EINTR
));
7184 warning ("Accept returned %d, error: %s\n",
7185 fd
, strerror (errno
));
7191 ret
= read (fd
, buf
, 1);
7192 } while (ret
== -1 && errno
== EINTR
);
7196 warning ("reading socket (fd=%d) failed with %s",
7197 fd
, strerror (errno
));
7204 if (startswith (cmd_buf
, "close"))
7209 else if (strcmp ("qTfSTM", cmd_buf
) == 0)
7211 cmd_qtfstm (cmd_buf
);
7213 else if (strcmp ("qTsSTM", cmd_buf
) == 0)
7215 cmd_qtsstm (cmd_buf
);
7217 else if (startswith (cmd_buf
, "unprobe_marker_at:"))
7219 unprobe_marker_at (cmd_buf
);
7221 else if (startswith (cmd_buf
, "probe_marker_at:"))
7223 probe_marker_at (cmd_buf
);
7225 else if (startswith (cmd_buf
, "qTSTMat:"))
7227 cmd_qtstmat (cmd_buf
);
7229 #endif /* HAVE_UST */
7232 /* Fix compiler's warning: ignoring return value of 'write'. */
7233 ret
= write (fd
, buf
, 1);
7239 unlink (agent_socket_name
);
7241 /* Sleep endlessly to wait the whole inferior stops. This
7242 thread can not exit because GDB or GDBserver may still need
7243 'current_thread' (representing this thread) to access
7244 inferior memory. Otherwise, this thread exits earlier than
7245 other threads, and 'current_thread' is set to NULL. */
7256 #include <pthread.h>
7259 IP_AGENT_EXPORT_VAR
int gdb_agent_capability
= AGENT_CAPA_STATIC_TRACE
;
7263 gdb_agent_init (void)
7270 /* We want the helper thread to be as transparent as possible, so
7271 have it inherit an all-signals-blocked mask. */
7273 sigfillset (&new_mask
);
7274 res
= pthread_sigmask (SIG_SETMASK
, &new_mask
, &orig_mask
);
7276 perror_with_name ("pthread_sigmask (1)");
7278 res
= pthread_create (&thread
,
7280 gdb_agent_helper_thread
,
7283 res
= pthread_sigmask (SIG_SETMASK
, &orig_mask
, NULL
);
7285 perror_with_name ("pthread_sigmask (2)");
7287 while (helper_thread_id
== 0)
7295 #include <sys/mman.h>
7298 IP_AGENT_EXPORT_VAR
char *gdb_tp_heap_buffer
;
7299 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer
;
7300 IP_AGENT_EXPORT_VAR
char *gdb_jump_pad_buffer_end
;
7301 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer
;
7302 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_end
;
7303 IP_AGENT_EXPORT_VAR
char *gdb_trampoline_buffer_error
;
7305 /* Record the result of getting buffer space for fast tracepoint
7306 trampolines. Any error message is copied, since caller may not be
7307 using persistent storage. */
7310 set_trampoline_buffer_space (CORE_ADDR begin
, CORE_ADDR end
, char *errmsg
)
7312 gdb_trampoline_buffer
= (char *) (uintptr_t) begin
;
7313 gdb_trampoline_buffer_end
= (char *) (uintptr_t) end
;
7315 strncpy (gdb_trampoline_buffer_error
, errmsg
, 99);
7317 strcpy (gdb_trampoline_buffer_error
, "no buffer passed");
7320 static void __attribute__ ((constructor
))
7321 initialize_tracepoint_ftlib (void)
7323 initialize_tracepoint ();
7328 #endif /* IN_PROCESS_AGENT */
7330 /* Return a timestamp, expressed as microseconds of the usual Unix
7331 time. (As the result is a 64-bit number, it will not overflow any
7335 get_timestamp (void)
7339 if (gettimeofday (&tv
, 0) != 0)
7342 return (LONGEST
) tv
.tv_sec
* 1000000 + tv
.tv_usec
;
7346 initialize_tracepoint (void)
7348 /* Start with the default size. */
7349 init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE
);
7351 /* Wire trace state variable 1 to be the timestamp. This will be
7352 uploaded to GDB upon connection and become one of its trace state
7353 variables. (In case you're wondering, if GDB already has a trace
7354 variable numbered 1, it will be renumbered.) */
7355 create_trace_state_variable (1, 0);
7356 set_trace_state_variable_name (1, "trace_timestamp");
7357 set_trace_state_variable_getter (1, get_timestamp
);
7359 #ifdef IN_PROCESS_AGENT
7364 pagesize
= sysconf (_SC_PAGE_SIZE
);
7366 perror_with_name ("sysconf");
7368 gdb_tp_heap_buffer
= xmalloc (5 * 1024 * 1024);
7370 #define SCRATCH_BUFFER_NPAGES 20
7372 /* Allocate scratch buffer aligned on a page boundary, at a low
7373 address (close to the main executable's code). */
7374 for (addr
= pagesize
; addr
!= 0; addr
+= pagesize
)
7376 gdb_jump_pad_buffer
= mmap ((void *) addr
, pagesize
* SCRATCH_BUFFER_NPAGES
,
7377 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
7378 MAP_PRIVATE
| MAP_ANONYMOUS
| MAP_FIXED
,
7380 if (gdb_jump_pad_buffer
!= MAP_FAILED
)
7385 perror_with_name ("mmap");
7387 gdb_jump_pad_buffer_end
= gdb_jump_pad_buffer
+ pagesize
* SCRATCH_BUFFER_NPAGES
;
7390 gdb_trampoline_buffer
= gdb_trampoline_buffer_end
= 0;
7392 /* It's not a fatal error for something to go wrong with trampoline
7393 buffer setup, but it can be mysterious, so create a channel to
7394 report back on what went wrong, using a fixed size since we may
7395 not be able to allocate space later when the problem occurs. */
7396 gdb_trampoline_buffer_error
= xmalloc (IPA_BUFSIZ
);
7398 strcpy (gdb_trampoline_buffer_error
, "No errors reported");
7400 initialize_low_tracepoint ();