390 lines
11 KiB
C
390 lines
11 KiB
C
/*
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* Logging support
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "qemu/range.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "trace/control.h"
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#include "qemu/thread.h"
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#include "qemu/lockable.h"
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static char *logfilename;
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static QemuMutex qemu_logfile_mutex;
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QemuLogFile *qemu_logfile;
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int qemu_loglevel;
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static int log_append = 0;
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static GArray *debug_regions;
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/* Return the number of characters emitted. */
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int qemu_log(const char *fmt, ...)
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{
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int ret = 0;
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QemuLogFile *logfile;
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rcu_read_lock();
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logfile = qatomic_rcu_read(&qemu_logfile);
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if (logfile) {
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va_list ap;
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va_start(ap, fmt);
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ret = vfprintf(logfile->fd, fmt, ap);
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va_end(ap);
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/* Don't pass back error results. */
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if (ret < 0) {
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ret = 0;
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}
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}
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rcu_read_unlock();
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return ret;
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}
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static void __attribute__((__constructor__)) qemu_logfile_init(void)
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{
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qemu_mutex_init(&qemu_logfile_mutex);
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}
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static void qemu_logfile_free(QemuLogFile *logfile)
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{
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g_assert(logfile);
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if (logfile->fd != stderr) {
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fclose(logfile->fd);
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}
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g_free(logfile);
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}
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static bool log_uses_own_buffers;
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/* enable or disable low levels log */
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void qemu_set_log(int log_flags)
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{
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bool need_to_open_file = false;
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QemuLogFile *logfile;
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qemu_loglevel = log_flags;
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#ifdef CONFIG_TRACE_LOG
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qemu_loglevel |= LOG_TRACE;
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#endif
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/*
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* In all cases we only log if qemu_loglevel is set.
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* Also:
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* If not daemonized we will always log either to stderr
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* or to a file (if there is a logfilename).
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* If we are daemonized,
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* we will only log if there is a logfilename.
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*/
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if (qemu_loglevel && (!is_daemonized() || logfilename)) {
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need_to_open_file = true;
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}
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QEMU_LOCK_GUARD(&qemu_logfile_mutex);
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if (qemu_logfile && !need_to_open_file) {
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logfile = qemu_logfile;
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qatomic_rcu_set(&qemu_logfile, NULL);
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call_rcu(logfile, qemu_logfile_free, rcu);
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} else if (!qemu_logfile && need_to_open_file) {
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logfile = g_new0(QemuLogFile, 1);
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if (logfilename) {
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logfile->fd = fopen(logfilename, log_append ? "a" : "w");
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if (!logfile->fd) {
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g_free(logfile);
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perror(logfilename);
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_exit(1);
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}
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/* In case we are a daemon redirect stderr to logfile */
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if (is_daemonized()) {
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dup2(fileno(logfile->fd), STDERR_FILENO);
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fclose(logfile->fd);
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/* This will skip closing logfile in qemu_log_close() */
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logfile->fd = stderr;
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}
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} else {
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/* Default to stderr if no log file specified */
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assert(!is_daemonized());
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logfile->fd = stderr;
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}
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/* must avoid mmap() usage of glibc by setting a buffer "by hand" */
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if (log_uses_own_buffers) {
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static char logfile_buf[4096];
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setvbuf(logfile->fd, logfile_buf, _IOLBF, sizeof(logfile_buf));
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} else {
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#if defined(_WIN32)
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/* Win32 doesn't support line-buffering, so use unbuffered output. */
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setvbuf(logfile->fd, NULL, _IONBF, 0);
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#else
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setvbuf(logfile->fd, NULL, _IOLBF, 0);
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#endif
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log_append = 1;
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}
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qatomic_rcu_set(&qemu_logfile, logfile);
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}
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}
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void qemu_log_needs_buffers(void)
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{
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log_uses_own_buffers = true;
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}
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/*
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* Allow the user to include %d in their logfile which will be
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* substituted with the current PID. This is useful for debugging many
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* nested linux-user tasks but will result in lots of logs.
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*
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* filename may be NULL. In that case, log output is sent to stderr
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*/
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void qemu_set_log_filename(const char *filename, Error **errp)
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{
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g_free(logfilename);
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logfilename = NULL;
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if (filename) {
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char *pidstr = strstr(filename, "%");
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if (pidstr) {
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/* We only accept one %d, no other format strings */
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if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) {
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error_setg(errp, "Bad logfile format: %s", filename);
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return;
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} else {
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logfilename = g_strdup_printf(filename, getpid());
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}
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} else {
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logfilename = g_strdup(filename);
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}
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}
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qemu_log_close();
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qemu_set_log(qemu_loglevel);
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}
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/* Returns true if addr is in our debug filter or no filter defined
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*/
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bool qemu_log_in_addr_range(uint64_t addr)
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{
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if (debug_regions) {
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int i = 0;
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for (i = 0; i < debug_regions->len; i++) {
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Range *range = &g_array_index(debug_regions, Range, i);
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if (range_contains(range, addr)) {
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return true;
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}
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}
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return false;
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} else {
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return true;
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}
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}
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void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
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{
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gchar **ranges = g_strsplit(filter_spec, ",", 0);
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int i;
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if (debug_regions) {
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g_array_unref(debug_regions);
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debug_regions = NULL;
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}
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debug_regions = g_array_sized_new(FALSE, FALSE,
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sizeof(Range), g_strv_length(ranges));
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for (i = 0; ranges[i]; i++) {
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const char *r = ranges[i];
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const char *range_op, *r2, *e;
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uint64_t r1val, r2val, lob, upb;
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struct Range range;
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range_op = strstr(r, "-");
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r2 = range_op ? range_op + 1 : NULL;
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if (!range_op) {
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range_op = strstr(r, "+");
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r2 = range_op ? range_op + 1 : NULL;
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}
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if (!range_op) {
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range_op = strstr(r, "..");
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r2 = range_op ? range_op + 2 : NULL;
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}
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if (!range_op) {
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error_setg(errp, "Bad range specifier");
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goto out;
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}
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if (qemu_strtou64(r, &e, 0, &r1val)
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|| e != range_op) {
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error_setg(errp, "Invalid number to the left of %.*s",
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(int)(r2 - range_op), range_op);
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goto out;
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}
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if (qemu_strtou64(r2, NULL, 0, &r2val)) {
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error_setg(errp, "Invalid number to the right of %.*s",
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(int)(r2 - range_op), range_op);
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goto out;
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}
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switch (*range_op) {
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case '+':
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lob = r1val;
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upb = r1val + r2val - 1;
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break;
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case '-':
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upb = r1val;
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lob = r1val - (r2val - 1);
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break;
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case '.':
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lob = r1val;
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upb = r2val;
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break;
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default:
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g_assert_not_reached();
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}
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if (lob > upb) {
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error_setg(errp, "Invalid range");
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goto out;
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}
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range_set_bounds(&range, lob, upb);
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g_array_append_val(debug_regions, range);
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}
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out:
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g_strfreev(ranges);
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}
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/* fflush() the log file */
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void qemu_log_flush(void)
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{
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QemuLogFile *logfile;
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rcu_read_lock();
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logfile = qatomic_rcu_read(&qemu_logfile);
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if (logfile) {
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fflush(logfile->fd);
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}
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rcu_read_unlock();
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}
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/* Close the log file */
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void qemu_log_close(void)
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{
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QemuLogFile *logfile;
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qemu_mutex_lock(&qemu_logfile_mutex);
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logfile = qemu_logfile;
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if (logfile) {
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qatomic_rcu_set(&qemu_logfile, NULL);
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call_rcu(logfile, qemu_logfile_free, rcu);
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}
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qemu_mutex_unlock(&qemu_logfile_mutex);
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}
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const QEMULogItem qemu_log_items[] = {
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{ CPU_LOG_TB_OUT_ASM, "out_asm",
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"show generated host assembly code for each compiled TB" },
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{ CPU_LOG_TB_IN_ASM, "in_asm",
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"show target assembly code for each compiled TB" },
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{ CPU_LOG_TB_OP, "op",
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"show micro ops for each compiled TB" },
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{ CPU_LOG_TB_OP_OPT, "op_opt",
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"show micro ops after optimization" },
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{ CPU_LOG_TB_OP_IND, "op_ind",
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"show micro ops before indirect lowering" },
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{ CPU_LOG_INT, "int",
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"show interrupts/exceptions in short format" },
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{ CPU_LOG_EXEC, "exec",
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"show trace before each executed TB (lots of logs)" },
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{ CPU_LOG_TB_CPU, "cpu",
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"show CPU registers before entering a TB (lots of logs)" },
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{ CPU_LOG_TB_FPU, "fpu",
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"include FPU registers in the 'cpu' logging" },
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{ CPU_LOG_MMU, "mmu",
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"log MMU-related activities" },
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{ CPU_LOG_PCALL, "pcall",
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"x86 only: show protected mode far calls/returns/exceptions" },
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{ CPU_LOG_RESET, "cpu_reset",
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"show CPU state before CPU resets" },
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{ LOG_UNIMP, "unimp",
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"log unimplemented functionality" },
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{ LOG_GUEST_ERROR, "guest_errors",
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"log when the guest OS does something invalid (eg accessing a\n"
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"non-existent register)" },
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{ CPU_LOG_PAGE, "page",
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"dump pages at beginning of user mode emulation" },
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{ CPU_LOG_TB_NOCHAIN, "nochain",
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"do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
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"complete traces" },
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#ifdef CONFIG_PLUGIN
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{ CPU_LOG_PLUGIN, "plugin", "output from TCG plugins\n"},
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#endif
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{ LOG_STRACE, "strace",
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"log every user-mode syscall, its input, and its result" },
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{ 0, NULL, NULL },
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};
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/* takes a comma separated list of log masks. Return 0 if error. */
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int qemu_str_to_log_mask(const char *str)
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{
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const QEMULogItem *item;
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int mask = 0;
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char **parts = g_strsplit(str, ",", 0);
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char **tmp;
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for (tmp = parts; tmp && *tmp; tmp++) {
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if (g_str_equal(*tmp, "all")) {
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for (item = qemu_log_items; item->mask != 0; item++) {
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mask |= item->mask;
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}
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#ifdef CONFIG_TRACE_LOG
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} else if (g_str_has_prefix(*tmp, "trace:") && (*tmp)[6] != '\0') {
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trace_enable_events((*tmp) + 6);
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mask |= LOG_TRACE;
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#endif
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} else {
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for (item = qemu_log_items; item->mask != 0; item++) {
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if (g_str_equal(*tmp, item->name)) {
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goto found;
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}
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}
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goto error;
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found:
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mask |= item->mask;
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}
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}
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g_strfreev(parts);
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return mask;
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error:
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g_strfreev(parts);
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return 0;
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}
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void qemu_print_log_usage(FILE *f)
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{
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const QEMULogItem *item;
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fprintf(f, "Log items (comma separated):\n");
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for (item = qemu_log_items; item->mask != 0; item++) {
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fprintf(f, "%-15s %s\n", item->name, item->help);
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}
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#ifdef CONFIG_TRACE_LOG
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fprintf(f, "trace:PATTERN enable trace events\n");
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fprintf(f, "\nUse \"-d trace:help\" to get a list of trace events.\n\n");
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#endif
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}
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