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handle_event.c
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handle_event.c
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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
* Copyright (C) 2010 Arnaud Patard, Mandriva SA
* Copyright (C) 1998,2001,2002,2003,2004,2007,2008,2009 Juan Cespedes
* Copyright (C) 2008 Luis Machado, IBM Corporation
* Copyright (C) 2006 Ian Wienand
* Copyright (C) 2006 Paul Gilliam, IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include "backend.h"
#include "breakpoint.h"
#include "common.h"
#include "fetch.h"
#include "library.h"
#include "proc.h"
#include "prototype.h"
#include "summary.h"
#include "value_dict.h"
static void handle_signal(Event *event);
static void handle_exit(Event *event);
static void handle_exit_signal(Event *event);
static void handle_syscall(Event *event);
static void handle_arch_syscall(Event *event);
static void handle_sysret(Event *event);
static void handle_arch_sysret(Event *event);
static void handle_clone(Event *event);
static void handle_exec(Event *event);
static void handle_breakpoint(Event *event);
static void handle_new(Event *event);
static void callstack_push_syscall(struct process *proc, int sysnum);
static void callstack_push_symfunc(struct process *proc, struct breakpoint *bp);
/* XXX Stack maintenance should be moved to a dedicated module, or to
* proc.c, and push/pop should be visible outside this module. For
* now, because we need this in proc.c, this is non-static. */
void callstack_pop(struct process *proc);
static char *shortsignal(struct process *proc, int signum);
static char *sysname(struct process *proc, int sysnum);
static char *arch_sysname(struct process *proc, int sysnum);
static Event *
call_handler(struct process *proc, Event *event)
{
assert(proc != NULL);
struct event_handler *handler = proc->event_handler;
if (handler == NULL)
return event;
return (*handler->on_event) (handler, event);
}
void
handle_event(Event *event)
{
if (exiting == 1) {
debug(1, "ltrace about to exit");
os_ltrace_exiting();
exiting = 2;
}
debug(DEBUG_FUNCTION, "handle_event(pid=%d, type=%d)",
event->proc ? event->proc->pid : -1, event->type);
/* If the thread group or an individual task define an
overriding event handler, give them a chance to kick in.
We will end up calling both handlers, if the first one
doesn't sink the event. */
if (event->proc != NULL) {
event = call_handler(event->proc, event);
if (event == NULL)
/* It was handled. */
return;
/* Note: the previous handler has a chance to alter
* the event. */
if (event->proc != NULL
&& event->proc->leader != NULL
&& event->proc != event->proc->leader) {
event = call_handler(event->proc->leader, event);
if (event == NULL)
return;
}
}
switch (event->type) {
case EVENT_NONE:
debug(1, "event: none");
return;
case EVENT_SIGNAL:
assert(event->proc != NULL);
debug(1, "[%d] event: signal (%s [%d])",
event->proc->pid,
shortsignal(event->proc, event->e_un.signum),
event->e_un.signum);
handle_signal(event);
return;
case EVENT_EXIT:
assert(event->proc != NULL);
debug(1, "[%d] event: exit (%d)",
event->proc->pid,
event->e_un.ret_val);
handle_exit(event);
return;
case EVENT_EXIT_SIGNAL:
assert(event->proc != NULL);
debug(1, "[%d] event: exit signal (%s [%d])",
event->proc->pid,
shortsignal(event->proc, event->e_un.signum),
event->e_un.signum);
handle_exit_signal(event);
return;
case EVENT_SYSCALL:
assert(event->proc != NULL);
debug(1, "[%d] event: syscall (%s [%d])",
event->proc->pid,
sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_syscall(event);
return;
case EVENT_SYSRET:
assert(event->proc != NULL);
debug(1, "[%d] event: sysret (%s [%d])",
event->proc->pid,
sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_sysret(event);
return;
case EVENT_ARCH_SYSCALL:
assert(event->proc != NULL);
debug(1, "[%d] event: arch_syscall (%s [%d])",
event->proc->pid,
arch_sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_arch_syscall(event);
return;
case EVENT_ARCH_SYSRET:
assert(event->proc != NULL);
debug(1, "[%d] event: arch_sysret (%s [%d])",
event->proc->pid,
arch_sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_arch_sysret(event);
return;
case EVENT_CLONE:
case EVENT_VFORK:
assert(event->proc != NULL);
debug(1, "[%d] event: clone (%u)",
event->proc->pid, event->e_un.newpid);
handle_clone(event);
return;
case EVENT_EXEC:
assert(event->proc != NULL);
debug(1, "[%d] event: exec()",
event->proc->pid);
handle_exec(event);
return;
case EVENT_BREAKPOINT:
assert(event->proc != NULL);
debug(1, "[%d] event: breakpoint %p",
event->proc->pid, event->e_un.brk_addr);
handle_breakpoint(event);
return;
case EVENT_NEW:
debug(1, "[%d] event: new process",
event->e_un.newpid);
handle_new(event);
return;
default:
fprintf(stderr, "Error! unknown event?\n");
exit(1);
}
}
typedef struct Pending_New Pending_New;
struct Pending_New {
pid_t pid;
Pending_New * next;
};
static Pending_New * pending_news = NULL;
static int
pending_new(pid_t pid) {
Pending_New * p;
debug(DEBUG_FUNCTION, "pending_new(%d)", pid);
p = pending_news;
while (p) {
if (p->pid == pid) {
return 1;
}
p = p->next;
}
return 0;
}
static void
pending_new_insert(pid_t pid) {
Pending_New * p;
debug(DEBUG_FUNCTION, "pending_new_insert(%d)", pid);
p = malloc(sizeof(Pending_New));
if (!p) {
perror("malloc()");
exit(1);
}
p->pid = pid;
p->next = pending_news;
pending_news = p;
}
static void
pending_new_remove(pid_t pid)
{
debug(DEBUG_FUNCTION, "pending_new_remove(%d)", pid);
Pending_New **pp;
for (pp = &pending_news; *pp != NULL; pp = &(*pp)->next)
if ((*pp)->pid == pid) {
Pending_New *p = *pp;
*pp = p->next;
free(p);
return;
}
}
static void
handle_clone(Event *event)
{
debug(DEBUG_FUNCTION, "handle_clone(pid=%d)", event->proc->pid);
struct process *proc = malloc(sizeof(*proc));
pid_t newpid = event->e_un.newpid;
if (proc == NULL
|| process_clone(proc, event->proc, newpid) < 0) {
free(proc);
proc = NULL;
fprintf(stderr,
"Couldn't initialize tracing of process %d.\n",
newpid);
} else {
proc->parent = event->proc;
/* We save register values to the arch pointer, and
* these need to be per-thread. XXX arch_ptr should
* be retired in favor of fetch interface anyway. */
proc->arch_ptr = NULL;
}
if (pending_new(newpid)) {
pending_new_remove(newpid);
if (proc != NULL) {
proc->event_handler = NULL;
if (event->proc->state == STATE_ATTACHED
&& options.follow)
proc->state = STATE_ATTACHED;
else
proc->state = STATE_IGNORED;
}
continue_process(newpid);
} else if (proc != NULL) {
proc->state = STATE_BEING_CREATED;
}
if (event->type != EVENT_VFORK)
continue_process(event->proc->pid);
else if (proc != NULL)
continue_after_vfork(proc);
else
continue_process(newpid);
}
static void
handle_new(Event *event)
{
debug(DEBUG_FUNCTION, "handle_new(pid=%d)", event->e_un.newpid);
struct process *proc = pid2proc(event->e_un.newpid);
if (!proc) {
pending_new_insert(event->e_un.newpid);
} else {
assert(proc->state == STATE_BEING_CREATED);
if (options.follow) {
proc->state = STATE_ATTACHED;
} else {
proc->state = STATE_IGNORED;
}
continue_process(proc->pid);
}
}
static char *
shortsignal(struct process *proc, int signum)
{
static char *signalent0[] = {
#include "signalent.h"
};
static char *signalent1[] = {
#include "signalent1.h"
};
static char **signalents[] = { signalent0, signalent1 };
int nsignals[] = { sizeof signalent0 / sizeof signalent0[0],
sizeof signalent1 / sizeof signalent1[0]
};
debug(DEBUG_FUNCTION, "shortsignal(pid=%d, signum=%d)", proc->pid, signum);
assert(proc->personality < sizeof signalents / sizeof signalents[0]);
if (signum < 0 || signum >= nsignals[proc->personality]) {
return "UNKNOWN_SIGNAL";
} else {
return signalents[proc->personality][signum];
}
}
static char *
sysname(struct process *proc, int sysnum)
{
static char result[128];
static char *syscallent0[] = {
#include "syscallent.h"
};
static char *syscallent1[] = {
#include "syscallent1.h"
};
static char **syscallents[] = { syscallent0, syscallent1 };
int nsyscalls[] = {
sizeof syscallent0 / sizeof syscallent0[0],
sizeof syscallent1 / sizeof syscallent1[0],
};
debug(DEBUG_FUNCTION, "sysname(pid=%d, sysnum=%d)", proc->pid, sysnum);
assert(proc->personality < sizeof syscallents / sizeof syscallents[0]);
if (sysnum < 0 || sysnum >= nsyscalls[proc->personality]) {
sprintf(result, "SYS_%d", sysnum);
return result;
} else {
return syscallents[proc->personality][sysnum];
}
}
static char *
arch_sysname(struct process *proc, int sysnum)
{
static char result[128];
static char *arch_syscallent[] = {
#include "arch_syscallent.h"
};
int nsyscalls = sizeof arch_syscallent / sizeof arch_syscallent[0];
debug(DEBUG_FUNCTION, "arch_sysname(pid=%d, sysnum=%d)", proc->pid, sysnum);
if (sysnum < 0 || sysnum >= nsyscalls) {
sprintf(result, "ARCH_%d", sysnum);
return result;
} else {
sprintf(result, "ARCH_%s", arch_syscallent[sysnum]);
return result;
}
}
#ifndef HAVE_STRSIGNAL
# define strsignal(SIGNUM) "???"
#endif
static void
handle_signal(Event *event) {
debug(DEBUG_FUNCTION, "handle_signal(pid=%d, signum=%d)", event->proc->pid, event->e_un.signum);
if (event->proc->state != STATE_IGNORED && !options.no_signals) {
output_line(event->proc, "--- %s (%s) ---",
shortsignal(event->proc, event->e_un.signum),
strsignal(event->e_un.signum));
}
continue_after_signal(event->proc->pid, event->e_un.signum);
}
static int
init_syscall_symbol(struct library_symbol *libsym, const char *name)
{
static struct library syscall_lib;
if (syscall_lib.protolib == NULL) {
struct protolib *protolib
= protolib_cache_load(&g_protocache, "syscalls", 0, 1);
if (protolib == NULL) {
fprintf(stderr, "Couldn't load system call prototypes:"
" %s.\n", strerror(errno));
/* Instead, get a fake one just so we can
* carry on, limping. */
protolib = malloc(sizeof *protolib);
if (protolib == NULL) {
fprintf(stderr, "Couldn't even allocate a fake "
"prototype library: %s.\n",
strerror(errno));
abort();
}
protolib_init(protolib);
}
assert(protolib != NULL);
if (library_init(&syscall_lib, LT_LIBTYPE_SYSCALL) < 0) {
fprintf(stderr, "Couldn't initialize system call "
"library: %s.\n", strerror(errno));
abort();
}
library_set_soname(&syscall_lib, "SYS", 0);
syscall_lib.protolib = protolib;
}
if (library_symbol_init(libsym, 0, name, 0, LS_TOPLT_NONE) < 0)
return -1;
libsym->lib = &syscall_lib;
return 0;
}
/* Account the unfinished functions on the call stack. */
static void
account_current_callstack(struct process *proc)
{
if (! options.summary)
return;
struct timedelta spent[proc->callstack_depth];
size_t i;
for (i = 0; i < proc->callstack_depth; ++i) {
struct callstack_element *elem = &proc->callstack[i];
spent[i] = calc_time_spent(elem->enter_time);
}
for (i = 0; i < proc->callstack_depth; ++i) {
struct callstack_element *elem = &proc->callstack[i];
struct library_symbol syscall, *libsym = NULL;
if (elem->is_syscall) {
const char *name = sysname(proc, elem->c_un.syscall);
if (init_syscall_symbol(&syscall, name) >= 0)
libsym = &syscall;
} else {
libsym = elem->c_un.libfunc;
}
if (libsym != NULL) {
summary_account_call(libsym, spent[i]);
if (elem->is_syscall)
library_symbol_destroy(&syscall);
}
}
}
static void
handle_exit(Event *event) {
debug(DEBUG_FUNCTION, "handle_exit(pid=%d, status=%d)", event->proc->pid, event->e_un.ret_val);
if (event->proc->state != STATE_IGNORED) {
output_line(event->proc, "+++ exited (status %d) +++",
event->e_un.ret_val);
}
account_current_callstack(event->proc);
remove_process(event->proc);
}
static void
handle_exit_signal(Event *event) {
debug(DEBUG_FUNCTION, "handle_exit_signal(pid=%d, signum=%d)", event->proc->pid, event->e_un.signum);
if (event->proc->state != STATE_IGNORED) {
output_line(event->proc, "+++ killed by %s +++",
shortsignal(event->proc, event->e_un.signum));
}
account_current_callstack(event->proc);
remove_process(event->proc);
}
static void
output_syscall(struct process *proc, const char *name, enum tof tof,
bool left, struct timedelta *spent)
{
if (left)
assert(spent == NULL);
struct library_symbol syscall;
if (init_syscall_symbol(&syscall, name) >= 0) {
if (left) {
if (! options.summary)
output_left(tof, proc, &syscall);
} else if (options.summary) {
summary_account_call(&syscall, *spent);
} else {
output_right(tof, proc, &syscall, spent);
}
library_symbol_destroy(&syscall);
}
}
static void
output_syscall_left(struct process *proc, const char *name)
{
output_syscall(proc, name, LT_TOF_SYSCALL, true, NULL);
}
static void
output_syscall_right(struct process *proc, const char *name,
struct timedelta *spent)
{
output_syscall(proc, name, LT_TOF_SYSCALLR, false, spent);
}
static void
handle_syscall(Event *event)
{
debug(DEBUG_FUNCTION, "handle_syscall(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
if (event->proc->state != STATE_IGNORED) {
callstack_push_syscall(event->proc, event->e_un.sysnum);
if (options.syscalls)
output_syscall_left(event->proc,
sysname(event->proc,
event->e_un.sysnum));
}
continue_after_syscall(event->proc, event->e_un.sysnum, 0);
}
static void
handle_exec(Event *event)
{
struct process *proc = event->proc;
/* Save the PID so that we can use it after unsuccessful
* process_exec. */
pid_t pid = proc->pid;
debug(DEBUG_FUNCTION, "handle_exec(pid=%d)", proc->pid);
if (proc->state == STATE_IGNORED) {
untrace:
untrace_pid(pid);
remove_process(proc);
return;
}
output_line(proc, "--- Called exec() ---");
account_current_callstack(proc);
if (process_exec(proc) < 0) {
fprintf(stderr,
"couldn't reinitialize process %d after exec\n", pid);
goto untrace;
}
continue_after_exec(proc);
}
static void
handle_arch_syscall(Event *event) {
debug(DEBUG_FUNCTION, "handle_arch_syscall(pid=%d, sysnum=%d)", event->proc->pid, event->e_un.sysnum);
if (event->proc->state != STATE_IGNORED) {
callstack_push_syscall(event->proc, 0xf0000 + event->e_un.sysnum);
if (options.syscalls) {
output_syscall_left(event->proc,
arch_sysname(event->proc,
event->e_un.sysnum));
}
}
continue_process(event->proc->pid);
}
static void
handle_x_sysret(Event *event, char *(*name_cb)(struct process *, int))
{
debug(DEBUG_FUNCTION, "handle_x_sysret(pid=%d, sysnum=%d)",
event->proc->pid, event->e_un.sysnum);
if (event->proc->state != STATE_IGNORED) {
unsigned d = event->proc->callstack_depth;
assert(d > 0);
struct callstack_element *elem = &event->proc->callstack[d - 1];
assert(elem->is_syscall);
struct timedelta spent = calc_time_spent(elem->enter_time);
if (options.syscalls)
output_syscall_right(event->proc,
name_cb(event->proc,
event->e_un.sysnum),
&spent);
callstack_pop(event->proc);
}
continue_after_syscall(event->proc, event->e_un.sysnum, 1);
}
static void
handle_sysret(Event *event)
{
handle_x_sysret(event, &sysname);
}
static void
handle_arch_sysret(Event *event)
{
handle_x_sysret(event, &arch_sysname);
}
static void
output_right_tos(struct process *proc)
{
size_t d = proc->callstack_depth;
assert(d > 0);
struct callstack_element *elem = &proc->callstack[d - 1];
assert(! elem->is_syscall);
if (proc->state != STATE_IGNORED) {
struct timedelta spent = calc_time_spent(elem->enter_time);
if (options.summary)
summary_account_call(elem->c_un.libfunc, spent);
else
output_right(LT_TOF_FUNCTIONR, proc, elem->c_un.libfunc,
&spent);
}
}
#ifndef ARCH_HAVE_SYMBOL_RET
void arch_symbol_ret(struct process *proc, struct library_symbol *libsym)
{
}
#endif
static void
handle_breakpoint(Event *event)
{
int i, j;
struct breakpoint *sbp;
struct process *leader = event->proc->leader;
void *brk_addr = event->e_un.brk_addr;
/* The leader has terminated. */
if (leader == NULL) {
continue_process(event->proc->pid);
return;
}
debug(DEBUG_FUNCTION, "handle_breakpoint(pid=%d, addr=%p)",
event->proc->pid, brk_addr);
debug(2, "event: breakpoint (%p)", brk_addr);
for (i = event->proc->callstack_depth - 1; i >= 0; i--) {
if (brk_addr == event->proc->callstack[i].return_addr) {
for (j = event->proc->callstack_depth - 1; j > i; j--)
callstack_pop(event->proc);
struct library_symbol *libsym =
event->proc->callstack[i].c_un.libfunc;
arch_symbol_ret(event->proc, libsym);
output_right_tos(event->proc);
callstack_pop(event->proc);
/* Pop also any other entries that seem like
* they are linked to the current one: they
* have the same return address, but were made
* for different symbols. This should only
* happen for entry point tracing, i.e. for -x
* everywhere, or -x and -e on MIPS. */
while (event->proc->callstack_depth > 0) {
struct callstack_element *prev;
size_t d = event->proc->callstack_depth;
prev = &event->proc->callstack[d - 1];
if (prev->c_un.libfunc == libsym
|| prev->return_addr != brk_addr)
break;
arch_symbol_ret(event->proc,
prev->c_un.libfunc);
output_right_tos(event->proc);
callstack_pop(event->proc);
}
/* Maybe the previous callstack_pop's got rid
* of the breakpoint, but if we are in a
* recursive call, it's still enabled. In
* that case we need to skip it properly. */
if ((sbp = address2bpstruct(leader, brk_addr)) != NULL) {
continue_after_breakpoint(event->proc, sbp);
} else {
set_instruction_pointer(event->proc, brk_addr);
continue_process(event->proc->pid);
}
return;
}
}
if ((sbp = address2bpstruct(leader, brk_addr)) != NULL)
breakpoint_on_hit(sbp, event->proc);
else if (event->proc->state != STATE_IGNORED)
output_line(event->proc,
"unexpected breakpoint at %p", brk_addr);
/* breakpoint_on_hit may delete its own breakpoint, so we have
* to look it up again. */
if ((sbp = address2bpstruct(leader, brk_addr)) != NULL) {
if (event->proc->state != STATE_IGNORED
&& sbp->libsym != NULL) {
event->proc->stack_pointer = get_stack_pointer(event->proc);
callstack_push_symfunc(event->proc, sbp);
if (! options.summary)
output_left(LT_TOF_FUNCTION, event->proc,
sbp->libsym);
}
breakpoint_on_continue(sbp, event->proc);
return;
} else {
set_instruction_pointer(event->proc, brk_addr);
}
continue_process(event->proc->pid);
}
static void
callstack_push_syscall(struct process *proc, int sysnum)
{
struct callstack_element *elem;
debug(DEBUG_FUNCTION, "callstack_push_syscall(pid=%d, sysnum=%d)", proc->pid, sysnum);
/* FIXME: not good -- should use dynamic allocation. 19990703 mortene. */
if (proc->callstack_depth == MAX_CALLDEPTH - 1) {
fprintf(stderr, "%s: Error: call nesting too deep!\n", __func__);
abort();
return;
}
elem = &proc->callstack[proc->callstack_depth];
*elem = (struct callstack_element){};
elem->is_syscall = 1;
elem->c_un.syscall = sysnum;
elem->return_addr = NULL;
proc->callstack_depth++;
if (opt_T || options.summary) {
struct timezone tz;
gettimeofday(&elem->enter_time, &tz);
}
}
static void
callstack_push_symfunc(struct process *proc, struct breakpoint *bp)
{
struct callstack_element *elem;
debug(DEBUG_FUNCTION, "callstack_push_symfunc(pid=%d, symbol=%s)",
proc->pid, bp->libsym->name);
/* FIXME: not good -- should use dynamic allocation. 19990703 mortene. */
if (proc->callstack_depth == MAX_CALLDEPTH - 1) {
fprintf(stderr, "%s: Error: call nesting too deep!\n", __func__);
abort();
return;
}
elem = &proc->callstack[proc->callstack_depth++];
*elem = (struct callstack_element){};
elem->is_syscall = 0;
elem->c_un.libfunc = bp->libsym;
struct breakpoint *rbp = NULL;
if (breakpoint_get_return_bp(&rbp, bp, proc) == 0
&& rbp != NULL) {
struct breakpoint *ext_rbp = insert_breakpoint(proc, rbp);
if (ext_rbp != rbp) {
breakpoint_destroy(rbp);
free(rbp);
rbp = ext_rbp;
}
}
elem->return_addr = rbp != NULL ? rbp->addr : 0;
if (opt_T || options.summary) {
struct timezone tz;
gettimeofday(&elem->enter_time, &tz);
}
}
void
callstack_pop(struct process *proc)
{
struct callstack_element *elem;
assert(proc->callstack_depth > 0);
debug(DEBUG_FUNCTION, "callstack_pop(pid=%d)", proc->pid);
elem = &proc->callstack[proc->callstack_depth - 1];
if (!elem->is_syscall && elem->return_addr) {
struct breakpoint *bp
= address2bpstruct(proc->leader, elem->return_addr);
if (bp != NULL) {
breakpoint_on_hit(bp, proc);
delete_breakpoint(proc, bp);
}
}
if (elem->fetch_context != NULL)
fetch_arg_done(elem->fetch_context);
if (elem->arguments != NULL) {
val_dict_destroy(elem->arguments);
free(elem->arguments);
}
proc->callstack_depth--;
}