handle_event.c revision e655ccffc4ba7bba317b01700f8fc50461d8c4dd
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
4 * Copyright (C) 2010 Arnaud Patard, Mandriva SA
5 * Copyright (C) 1998,2001,2002,2003,2004,2007,2008,2009 Juan Cespedes
6 * Copyright (C) 2008 Luis Machado, IBM Corporation
7 * Copyright (C) 2006 Ian Wienand
8 * Copyright (C) 2006 Paul Gilliam, IBM Corporation
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 * 02110-1301 USA
24 */
25
26#include "config.h"
27
28#define _GNU_SOURCE
29#include <assert.h>
30#include <errno.h>
31#include <signal.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <sys/time.h>
36
37#include "backend.h"
38#include "breakpoint.h"
39#include "common.h"
40#include "fetch.h"
41#include "library.h"
42#include "proc.h"
43#include "value_dict.h"
44
45static void handle_signal(Event *event);
46static void handle_exit(Event *event);
47static void handle_exit_signal(Event *event);
48static void handle_syscall(Event *event);
49static void handle_arch_syscall(Event *event);
50static void handle_sysret(Event *event);
51static void handle_arch_sysret(Event *event);
52static void handle_clone(Event *event);
53static void handle_exec(Event *event);
54static void handle_breakpoint(Event *event);
55static void handle_new(Event *event);
56
57static void callstack_push_syscall(Process *proc, int sysnum);
58static void callstack_push_symfunc(Process *proc,
59				   struct library_symbol *sym);
60/* XXX Stack maintenance should be moved to a dedicated module, or to
61 * proc.c, and push/pop should be visible outside this module.  For
62 * now, because we need this in proc.c, this is non-static.  */
63void callstack_pop(struct Process *proc);
64
65static char * shortsignal(Process *proc, int signum);
66static char * sysname(Process *proc, int sysnum);
67static char * arch_sysname(Process *proc, int sysnum);
68
69static Event *
70call_handler(Process * proc, Event * event)
71{
72	assert(proc != NULL);
73
74	struct event_handler *handler = proc->event_handler;
75	if (handler == NULL)
76		return event;
77
78	return (*handler->on_event) (handler, event);
79}
80
81void
82handle_event(Event *event)
83{
84	if (exiting == 1) {
85		debug(1, "ltrace about to exit");
86		os_ltrace_exiting();
87		exiting = 2;
88	}
89	debug(DEBUG_FUNCTION, "handle_event(pid=%d, type=%d)",
90	      event->proc ? event->proc->pid : -1, event->type);
91
92	/* If the thread group or an individual task define an
93	   overriding event handler, give them a chance to kick in.
94	   We will end up calling both handlers, if the first one
95	   doesn't sink the event.  */
96	if (event->proc != NULL) {
97		event = call_handler(event->proc, event);
98		if (event == NULL)
99			/* It was handled.  */
100			return;
101
102		/* Note: the previous handler has a chance to alter
103		 * the event.  */
104		if (event->proc != NULL
105		    && event->proc->leader != NULL
106		    && event->proc != event->proc->leader) {
107			event = call_handler(event->proc->leader, event);
108			if (event == NULL)
109				return;
110		}
111	}
112
113	switch (event->type) {
114	case EVENT_NONE:
115		debug(1, "event: none");
116		return;
117	case EVENT_SIGNAL:
118		debug(1, "[%d] event: signal (%s [%d])",
119		      event->proc->pid,
120		      shortsignal(event->proc, event->e_un.signum),
121		      event->e_un.signum);
122		handle_signal(event);
123		return;
124	case EVENT_EXIT:
125		debug(1, "[%d] event: exit (%d)",
126		      event->proc->pid,
127		      event->e_un.ret_val);
128		handle_exit(event);
129		return;
130	case EVENT_EXIT_SIGNAL:
131		debug(1, "[%d] event: exit signal (%s [%d])",
132		      event->proc->pid,
133		      shortsignal(event->proc, event->e_un.signum),
134		      event->e_un.signum);
135		handle_exit_signal(event);
136		return;
137	case EVENT_SYSCALL:
138		debug(1, "[%d] event: syscall (%s [%d])",
139		      event->proc->pid,
140		      sysname(event->proc, event->e_un.sysnum),
141		      event->e_un.sysnum);
142		handle_syscall(event);
143		return;
144	case EVENT_SYSRET:
145		debug(1, "[%d] event: sysret (%s [%d])",
146		      event->proc->pid,
147		      sysname(event->proc, event->e_un.sysnum),
148		      event->e_un.sysnum);
149		handle_sysret(event);
150		return;
151	case EVENT_ARCH_SYSCALL:
152		debug(1, "[%d] event: arch_syscall (%s [%d])",
153		      event->proc->pid,
154		      arch_sysname(event->proc, event->e_un.sysnum),
155		      event->e_un.sysnum);
156		handle_arch_syscall(event);
157		return;
158	case EVENT_ARCH_SYSRET:
159		debug(1, "[%d] event: arch_sysret (%s [%d])",
160		      event->proc->pid,
161		      arch_sysname(event->proc, event->e_un.sysnum),
162		      event->e_un.sysnum);
163		handle_arch_sysret(event);
164		return;
165	case EVENT_CLONE:
166	case EVENT_VFORK:
167		debug(1, "[%d] event: clone (%u)",
168		      event->proc->pid, event->e_un.newpid);
169		handle_clone(event);
170		return;
171	case EVENT_EXEC:
172		debug(1, "[%d] event: exec()",
173		      event->proc->pid);
174		handle_exec(event);
175		return;
176	case EVENT_BREAKPOINT:
177		debug(1, "[%d] event: breakpoint %p",
178		      event->proc->pid, event->e_un.brk_addr);
179		handle_breakpoint(event);
180		return;
181	case EVENT_NEW:
182		debug(1, "[%d] event: new process",
183		      event->e_un.newpid);
184		handle_new(event);
185		return;
186	default:
187		fprintf(stderr, "Error! unknown event?\n");
188		exit(1);
189	}
190}
191
192typedef struct Pending_New Pending_New;
193struct Pending_New {
194	pid_t pid;
195	Pending_New * next;
196};
197static Pending_New * pending_news = NULL;
198
199static int
200pending_new(pid_t pid) {
201	Pending_New * p;
202
203	debug(DEBUG_FUNCTION, "pending_new(%d)", pid);
204
205	p = pending_news;
206	while (p) {
207		if (p->pid == pid) {
208			return 1;
209		}
210		p = p->next;
211	}
212	return 0;
213}
214
215static void
216pending_new_insert(pid_t pid) {
217	Pending_New * p;
218
219	debug(DEBUG_FUNCTION, "pending_new_insert(%d)", pid);
220
221	p = malloc(sizeof(Pending_New));
222	if (!p) {
223		perror("malloc()");
224		exit(1);
225	}
226	p->pid = pid;
227	p->next = pending_news;
228	pending_news = p;
229}
230
231static void
232pending_new_remove(pid_t pid) {
233	Pending_New *p, *pred;
234
235	debug(DEBUG_FUNCTION, "pending_new_remove(%d)", pid);
236
237	p = pending_news;
238	pred = NULL;
239	if (p->pid == pid) {
240		pending_news = p->next;
241		free(p);
242	} else {
243		while (p) {
244			if (p->pid == pid) {
245				pred->next = p->next;
246				free(p);
247			}
248			pred = p;
249			p = p->next;
250		}
251	}
252}
253
254static void
255handle_clone(Event *event)
256{
257	debug(DEBUG_FUNCTION, "handle_clone(pid=%d)", event->proc->pid);
258
259	struct Process *proc = malloc(sizeof(*proc));
260	if (proc == NULL) {
261	fail:
262		free(proc);
263		fprintf(stderr,
264			"Error during init of tracing process %d\n"
265			"This process won't be traced.\n",
266			event->proc->pid);
267		return;
268	}
269
270	if (process_clone(proc, event->proc, event->e_un.newpid) < 0)
271		goto fail;
272	proc->parent = event->proc;
273
274	/* We save register values to the arch pointer, and these need
275	   to be per-thread.  */
276	proc->arch_ptr = NULL;
277
278	if (pending_new(proc->pid)) {
279		pending_new_remove(proc->pid);
280		/* XXX this used to be destroy_event_handler call, but
281		 * I don't think we want to call that on a shared
282		 * state.  */
283		proc->event_handler = NULL;
284		if (event->proc->state == STATE_ATTACHED && options.follow)
285			proc->state = STATE_ATTACHED;
286		else
287			proc->state = STATE_IGNORED;
288		continue_process(proc->pid);
289	} else {
290		proc->state = STATE_BEING_CREATED;
291	}
292
293	if (event->type == EVENT_VFORK)
294		continue_after_vfork(proc);
295	else
296		continue_process(event->proc->pid);
297}
298
299static void
300handle_new(Event * event) {
301	Process * proc;
302
303	debug(DEBUG_FUNCTION, "handle_new(pid=%d)", event->e_un.newpid);
304
305	proc = pid2proc(event->e_un.newpid);
306	if (!proc) {
307		pending_new_insert(event->e_un.newpid);
308	} else {
309		assert(proc->state == STATE_BEING_CREATED);
310		if (options.follow) {
311			proc->state = STATE_ATTACHED;
312		} else {
313			proc->state = STATE_IGNORED;
314		}
315		continue_process(proc->pid);
316	}
317}
318
319static char *
320shortsignal(Process *proc, int signum) {
321	static char *signalent0[] = {
322#include "signalent.h"
323	};
324	static char *signalent1[] = {
325#include "signalent1.h"
326	};
327	static char **signalents[] = { signalent0, signalent1 };
328	int nsignals[] = { sizeof signalent0 / sizeof signalent0[0],
329		sizeof signalent1 / sizeof signalent1[0]
330	};
331
332	debug(DEBUG_FUNCTION, "shortsignal(pid=%d, signum=%d)", proc->pid, signum);
333
334	if (proc->personality > sizeof signalents / sizeof signalents[0])
335		abort();
336	if (signum < 0 || signum >= nsignals[proc->personality]) {
337		return "UNKNOWN_SIGNAL";
338	} else {
339		return signalents[proc->personality][signum];
340	}
341}
342
343static char *
344sysname(Process *proc, int sysnum) {
345	static char result[128];
346	static char *syscalent0[] = {
347#include "syscallent.h"
348	};
349	static char *syscalent1[] = {
350#include "syscallent1.h"
351	};
352	static char **syscalents[] = { syscalent0, syscalent1 };
353	int nsyscals[] = { sizeof syscalent0 / sizeof syscalent0[0],
354		sizeof syscalent1 / sizeof syscalent1[0]
355	};
356
357	debug(DEBUG_FUNCTION, "sysname(pid=%d, sysnum=%d)", proc->pid, sysnum);
358
359	if (proc->personality > sizeof syscalents / sizeof syscalents[0])
360		abort();
361	if (sysnum < 0 || sysnum >= nsyscals[proc->personality]) {
362		sprintf(result, "SYS_%d", sysnum);
363		return result;
364	} else {
365		sprintf(result, "SYS_%s",
366			syscalents[proc->personality][sysnum]);
367		return result;
368	}
369}
370
371static char *
372arch_sysname(Process *proc, int sysnum) {
373	static char result[128];
374	static char *arch_syscalent[] = {
375#include "arch_syscallent.h"
376	};
377	int nsyscals = sizeof arch_syscalent / sizeof arch_syscalent[0];
378
379	debug(DEBUG_FUNCTION, "arch_sysname(pid=%d, sysnum=%d)", proc->pid, sysnum);
380
381	if (sysnum < 0 || sysnum >= nsyscals) {
382		sprintf(result, "ARCH_%d", sysnum);
383		return result;
384	} else {
385		sprintf(result, "ARCH_%s",
386				arch_syscalent[sysnum]);
387		return result;
388	}
389}
390
391static void
392handle_signal(Event *event) {
393	debug(DEBUG_FUNCTION, "handle_signal(pid=%d, signum=%d)", event->proc->pid, event->e_un.signum);
394	if (event->proc->state != STATE_IGNORED && !options.no_signals) {
395		output_line(event->proc, "--- %s (%s) ---",
396				shortsignal(event->proc, event->e_un.signum),
397				strsignal(event->e_un.signum));
398	}
399	continue_after_signal(event->proc->pid, event->e_un.signum);
400}
401
402static void
403handle_exit(Event *event) {
404	debug(DEBUG_FUNCTION, "handle_exit(pid=%d, status=%d)", event->proc->pid, event->e_un.ret_val);
405	if (event->proc->state != STATE_IGNORED) {
406		output_line(event->proc, "+++ exited (status %d) +++",
407				event->e_un.ret_val);
408	}
409	remove_process(event->proc);
410}
411
412static void
413handle_exit_signal(Event *event) {
414	debug(DEBUG_FUNCTION, "handle_exit_signal(pid=%d, signum=%d)", event->proc->pid, event->e_un.signum);
415	if (event->proc->state != STATE_IGNORED) {
416		output_line(event->proc, "+++ killed by %s +++",
417				shortsignal(event->proc, event->e_un.signum));
418	}
419	remove_process(event->proc);
420}
421
422static void
423output_syscall(struct Process *proc, const char *name, enum tof tof,
424	       void (*output)(enum tof, struct Process *,
425			      struct library_symbol *))
426{
427	struct library_symbol syscall;
428	if (library_symbol_init(&syscall, 0, name, 0, LS_TOPLT_NONE) >= 0) {
429		(*output)(tof, proc, &syscall);
430		library_symbol_destroy(&syscall);
431	}
432}
433
434static void
435output_syscall_left(struct Process *proc, const char *name)
436{
437	output_syscall(proc, name, LT_TOF_SYSCALL, &output_left);
438}
439
440static void
441output_syscall_right(struct Process *proc, const char *name)
442{
443	output_syscall(proc, name, LT_TOF_SYSCALLR, &output_right);
444}
445
446static void
447handle_syscall(Event *event) {
448	debug(DEBUG_FUNCTION, "handle_syscall(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
449	if (event->proc->state != STATE_IGNORED) {
450		callstack_push_syscall(event->proc, event->e_un.sysnum);
451		if (options.syscalls)
452			output_syscall_left(event->proc,
453					    sysname(event->proc,
454						    event->e_un.sysnum));
455	}
456	continue_after_syscall(event->proc, event->e_un.sysnum, 0);
457}
458
459static void
460handle_exec(Event * event) {
461	Process * proc = event->proc;
462
463	/* Save the PID so that we can use it after unsuccessful
464	 * process_exec.  */
465	pid_t pid = proc->pid;
466
467	debug(DEBUG_FUNCTION, "handle_exec(pid=%d)", proc->pid);
468	if (proc->state == STATE_IGNORED) {
469	untrace:
470		untrace_pid(pid);
471		remove_process(proc);
472		return;
473	}
474	output_line(proc, "--- Called exec() ---");
475
476	if (process_exec(proc) < 0) {
477		fprintf(stderr,
478			"couldn't reinitialize process %d after exec\n", pid);
479		goto untrace;
480	}
481
482	continue_process(proc->pid);
483
484	/* After the exec, we expect to hit the first executable
485	 * instruction.
486	 *
487	 * XXX TODO It would be nice to have this removed, but then we
488	 * need to do that also for initial call to wait_for_proc in
489	 * execute_program.  In that case we could generate a
490	 * EVENT_FIRST event or something, or maybe this could somehow
491	 * be rolled into EVENT_NEW.  */
492	wait_for_proc(proc->pid);
493	continue_process(proc->pid);
494}
495
496static void
497handle_arch_syscall(Event *event) {
498	debug(DEBUG_FUNCTION, "handle_arch_syscall(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
499	if (event->proc->state != STATE_IGNORED) {
500		callstack_push_syscall(event->proc, 0xf0000 + event->e_un.sysnum);
501		if (options.syscalls) {
502			output_syscall_left(event->proc,
503					    arch_sysname(event->proc,
504							 event->e_un.sysnum));
505		}
506	}
507	continue_process(event->proc->pid);
508}
509
510struct timeval current_time_spent;
511
512static void
513calc_time_spent(Process *proc) {
514	struct timeval tv;
515	struct timezone tz;
516	struct timeval diff;
517	struct callstack_element *elem;
518
519	debug(DEBUG_FUNCTION, "calc_time_spent(pid=%d)", proc->pid);
520	elem = &proc->callstack[proc->callstack_depth - 1];
521
522	gettimeofday(&tv, &tz);
523
524	diff.tv_sec = tv.tv_sec - elem->time_spent.tv_sec;
525	if (tv.tv_usec >= elem->time_spent.tv_usec) {
526		diff.tv_usec = tv.tv_usec - elem->time_spent.tv_usec;
527	} else {
528		diff.tv_sec--;
529		diff.tv_usec = 1000000 + tv.tv_usec - elem->time_spent.tv_usec;
530	}
531	current_time_spent = diff;
532}
533
534static void
535handle_sysret(Event *event) {
536	debug(DEBUG_FUNCTION, "handle_sysret(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
537	if (event->proc->state != STATE_IGNORED) {
538		if (opt_T || options.summary) {
539			calc_time_spent(event->proc);
540		}
541		if (options.syscalls)
542			output_syscall_right(event->proc,
543					     sysname(event->proc,
544						     event->e_un.sysnum));
545
546		assert(event->proc->callstack_depth > 0);
547		unsigned d = event->proc->callstack_depth - 1;
548		assert(event->proc->callstack[d].is_syscall);
549		callstack_pop(event->proc);
550	}
551	continue_after_syscall(event->proc, event->e_un.sysnum, 1);
552}
553
554static void
555handle_arch_sysret(Event *event) {
556	debug(DEBUG_FUNCTION, "handle_arch_sysret(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
557	if (event->proc->state != STATE_IGNORED) {
558		if (opt_T || options.summary) {
559			calc_time_spent(event->proc);
560		}
561		if (options.syscalls)
562			output_syscall_right(event->proc,
563					     arch_sysname(event->proc,
564							  event->e_un.sysnum));
565		callstack_pop(event->proc);
566	}
567	continue_process(event->proc->pid);
568}
569
570static void
571output_right_tos(struct Process *proc)
572{
573	size_t d = proc->callstack_depth;
574	struct callstack_element *elem = &proc->callstack[d - 1];
575	if (proc->state != STATE_IGNORED)
576		output_right(LT_TOF_FUNCTIONR, proc, elem->c_un.libfunc);
577}
578
579#ifndef ARCH_HAVE_SYMBOL_RET
580void arch_symbol_ret(struct Process *proc, struct library_symbol *libsym)
581{
582}
583#endif
584
585static void
586handle_breakpoint(Event *event)
587{
588	int i, j;
589	struct breakpoint *sbp;
590	Process *leader = event->proc->leader;
591	void *brk_addr = event->e_un.brk_addr;
592
593	/* The leader has terminated.  */
594	if (leader == NULL) {
595		continue_process(event->proc->pid);
596		return;
597	}
598
599	debug(DEBUG_FUNCTION, "handle_breakpoint(pid=%d, addr=%p)",
600	      event->proc->pid, brk_addr);
601	debug(2, "event: breakpoint (%p)", brk_addr);
602
603	for (i = event->proc->callstack_depth - 1; i >= 0; i--) {
604		if (brk_addr == event->proc->callstack[i].return_addr) {
605			for (j = event->proc->callstack_depth - 1; j > i; j--) {
606				callstack_pop(event->proc);
607			}
608			if (event->proc->state != STATE_IGNORED) {
609				if (opt_T || options.summary) {
610					calc_time_spent(event->proc);
611				}
612			}
613			event->proc->return_addr = brk_addr;
614
615			struct library_symbol *libsym =
616			    event->proc->callstack[i].c_un.libfunc;
617
618			arch_symbol_ret(event->proc, libsym);
619			output_right_tos(event->proc);
620			callstack_pop(event->proc);
621
622			/* Pop also any other entries that seem like
623			 * they are linked to the current one: they
624			 * have the same return address, but were made
625			 * for different symbols.  This should only
626			 * happen for entry point tracing, i.e. for -x
627			 * everywhere, or -x and -e on MIPS.  */
628			while (event->proc->callstack_depth > 0) {
629				struct callstack_element *prev;
630				size_t d = event->proc->callstack_depth;
631				prev = &event->proc->callstack[d - 1];
632
633				if (prev->c_un.libfunc == libsym
634				    || prev->return_addr != brk_addr)
635					break;
636
637				arch_symbol_ret(event->proc,
638						prev->c_un.libfunc);
639				output_right_tos(event->proc);
640				callstack_pop(event->proc);
641			}
642
643			/* Maybe the previous callstack_pop's got rid
644			 * of the breakpoint, but if we are in a
645			 * recursive call, it's still enabled.  In
646			 * that case we need to skip it properly.  */
647			if ((sbp = address2bpstruct(leader, brk_addr)) != NULL) {
648				continue_after_breakpoint(event->proc, sbp);
649			} else {
650				set_instruction_pointer(event->proc, brk_addr);
651				continue_process(event->proc->pid);
652			}
653			return;
654		}
655	}
656
657	if ((sbp = address2bpstruct(leader, brk_addr)) != NULL)
658		breakpoint_on_hit(sbp, event->proc);
659	else if (event->proc->state != STATE_IGNORED)
660		output_line(event->proc,
661			    "unexpected breakpoint at %p", brk_addr);
662
663	/* breakpoint_on_hit may delete its own breakpoint, so we have
664	 * to look it up again.  */
665	if ((sbp = address2bpstruct(leader, brk_addr)) != NULL) {
666		if (event->proc->state != STATE_IGNORED
667		    && sbp->libsym != NULL) {
668			event->proc->stack_pointer = get_stack_pointer(event->proc);
669			event->proc->return_addr =
670				get_return_addr(event->proc, event->proc->stack_pointer);
671			callstack_push_symfunc(event->proc, sbp->libsym);
672			output_left(LT_TOF_FUNCTION, event->proc, sbp->libsym);
673		}
674
675		breakpoint_on_continue(sbp, event->proc);
676		return;
677	} else {
678		set_instruction_pointer(event->proc, brk_addr);
679	}
680
681	continue_process(event->proc->pid);
682}
683
684static void
685callstack_push_syscall(Process *proc, int sysnum) {
686	struct callstack_element *elem;
687
688	debug(DEBUG_FUNCTION, "callstack_push_syscall(pid=%d, sysnum=%d)", proc->pid, sysnum);
689	/* FIXME: not good -- should use dynamic allocation. 19990703 mortene. */
690	if (proc->callstack_depth == MAX_CALLDEPTH - 1) {
691		fprintf(stderr, "%s: Error: call nesting too deep!\n", __func__);
692		abort();
693		return;
694	}
695
696	elem = &proc->callstack[proc->callstack_depth];
697	*elem = (struct callstack_element){};
698	elem->is_syscall = 1;
699	elem->c_un.syscall = sysnum;
700	elem->return_addr = NULL;
701
702	proc->callstack_depth++;
703	if (opt_T || options.summary) {
704		struct timezone tz;
705		gettimeofday(&elem->time_spent, &tz);
706	}
707}
708
709static void
710callstack_push_symfunc(Process *proc, struct library_symbol *sym) {
711	struct callstack_element *elem;
712
713	debug(DEBUG_FUNCTION, "callstack_push_symfunc(pid=%d, symbol=%s)", proc->pid, sym->name);
714	/* FIXME: not good -- should use dynamic allocation. 19990703 mortene. */
715	if (proc->callstack_depth == MAX_CALLDEPTH - 1) {
716		fprintf(stderr, "%s: Error: call nesting too deep!\n", __func__);
717		abort();
718		return;
719	}
720
721	elem = &proc->callstack[proc->callstack_depth++];
722	*elem = (struct callstack_element){};
723	elem->is_syscall = 0;
724	elem->c_un.libfunc = sym;
725
726	elem->return_addr = proc->return_addr;
727	if (elem->return_addr)
728		insert_breakpoint(proc, elem->return_addr, NULL);
729
730	if (opt_T || options.summary) {
731		struct timezone tz;
732		gettimeofday(&elem->time_spent, &tz);
733	}
734}
735
736void
737callstack_pop(struct Process *proc)
738{
739	struct callstack_element *elem;
740	assert(proc->callstack_depth > 0);
741
742	debug(DEBUG_FUNCTION, "callstack_pop(pid=%d)", proc->pid);
743	elem = &proc->callstack[proc->callstack_depth - 1];
744	if (!elem->is_syscall && elem->return_addr)
745		delete_breakpoint(proc, elem->return_addr);
746
747	if (elem->fetch_context != NULL)
748		fetch_arg_done(elem->fetch_context);
749
750	if (elem->arguments != NULL) {
751		val_dict_destroy(elem->arguments);
752		free(elem->arguments);
753	}
754
755	proc->callstack_depth--;
756}
757