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989b697ddd
Switch the default for qemu_log logging output from "/tmp/qemu.log" to stderr. This is an incompatible change in some sense, but logging is mostly used for debugging purposes so it shouldn't affect production use. The previous behaviour can be obtained by adding "-D /tmp/qemu.log" to the command line. This change requires us to: * update all the documentation/help text (we take the opportunity to smooth out minor inconsistencies between the phrasing in linux-user/bsd-user/system help messages) * make linux-user and bsd-user defer to qemu-log for the default logging destination rather than overriding it themselves * ensure that all logfile closing is done via qemu_log_close() and that that function doesn't close stderr as well as the obvious change to the behaviour of do_qemu_set_log() when no logfile name has been specified. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-id: 1361901160-28729-1-git-send-email-peter.maydell@linaro.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
175 lines
4.8 KiB
C
175 lines
4.8 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 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-common.h"
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#include "qemu/log.h"
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static char *logfilename;
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FILE *qemu_logfile;
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int qemu_loglevel;
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static int log_append = 0;
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void qemu_log(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (qemu_logfile) {
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vfprintf(qemu_logfile, fmt, ap);
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}
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va_end(ap);
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}
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void qemu_log_mask(int mask, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if ((qemu_loglevel & mask) && qemu_logfile) {
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vfprintf(qemu_logfile, fmt, ap);
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}
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va_end(ap);
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}
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/* enable or disable low levels log */
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void do_qemu_set_log(int log_flags, bool use_own_buffers)
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{
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qemu_loglevel = log_flags;
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if (qemu_loglevel && !qemu_logfile) {
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if (logfilename) {
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qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
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if (!qemu_logfile) {
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perror(logfilename);
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_exit(1);
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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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qemu_logfile = 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 (use_own_buffers) {
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static char logfile_buf[4096];
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setvbuf(qemu_logfile, 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(qemu_logfile, NULL, _IONBF, 0);
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#else
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setvbuf(qemu_logfile, NULL, _IOLBF, 0);
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#endif
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log_append = 1;
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}
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}
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if (!qemu_loglevel && qemu_logfile) {
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qemu_log_close();
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}
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}
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void qemu_set_log_filename(const char *filename)
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{
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g_free(logfilename);
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logfilename = g_strdup(filename);
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qemu_log_close();
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qemu_set_log(qemu_loglevel);
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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 (x86 only: before eflags optimization) and\n"
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"after liveness analysis" },
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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 state before block translation" },
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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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"x86 only: show CPU state before CPU resets" },
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{ CPU_LOG_IOPORT, "ioport",
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"show all i/o ports accesses" },
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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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{ 0, NULL, NULL },
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};
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static int cmp1(const char *s1, int n, const char *s2)
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{
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if (strlen(s2) != n) {
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return 0;
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}
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return memcmp(s1, s2, n) == 0;
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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;
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const char *p, *p1;
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p = str;
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mask = 0;
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for (;;) {
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p1 = strchr(p, ',');
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if (!p1) {
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p1 = p + strlen(p);
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}
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if (cmp1(p,p1-p,"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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} else {
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for (item = qemu_log_items; item->mask != 0; item++) {
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if (cmp1(p, p1 - p, item->name)) {
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goto found;
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}
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}
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return 0;
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}
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found:
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mask |= item->mask;
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if (*p1 != ',') {
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break;
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}
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p = p1 + 1;
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}
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return mask;
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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, "%-10s %s\n", item->name, item->help);
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}
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}
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