summaryrefslogtreecommitdiff
path: root/util/log.c
blob: a7ddc7ecd138f0796f70b36fbb49872510846e7e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
 * Logging support
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/log.h"
#include "trace/control.h"

static char *logfilename;
FILE *qemu_logfile;
int qemu_loglevel;
static int log_append = 0;

void qemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    if (qemu_logfile) {
        vfprintf(qemu_logfile, fmt, ap);
    }
    va_end(ap);
}

void qemu_log_mask(int mask, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    if ((qemu_loglevel & mask) && qemu_logfile) {
        vfprintf(qemu_logfile, fmt, ap);
    }
    va_end(ap);
}

/* enable or disable low levels log */
void do_qemu_set_log(int log_flags, bool use_own_buffers)
{
    qemu_loglevel = log_flags;
#ifdef CONFIG_TRACE_LOG
    qemu_loglevel |= LOG_TRACE;
#endif
    if ((qemu_loglevel || is_daemonized()) && !qemu_logfile) {
        if (logfilename) {
            qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
            if (!qemu_logfile) {
                perror(logfilename);
                _exit(1);
            }
            /* In case we are a daemon redirect stderr to logfile */
            if (is_daemonized()) {
                dup2(fileno(qemu_logfile), STDERR_FILENO);
                fclose(qemu_logfile);
                /* This will skip closing logfile in qemu_log_close() */
                qemu_logfile = stderr;
            }
        } else {
            /* Default to stderr if no log file specified */
            qemu_logfile = stderr;
        }
        /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
        if (use_own_buffers) {
            static char logfile_buf[4096];

            setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
        } else {
#if defined(_WIN32)
            /* Win32 doesn't support line-buffering, so use unbuffered output. */
            setvbuf(qemu_logfile, NULL, _IONBF, 0);
#else
            setvbuf(qemu_logfile, NULL, _IOLBF, 0);
#endif
            log_append = 1;
        }
    }
    if (!qemu_loglevel && !is_daemonized() && qemu_logfile) {
        qemu_log_close();
    }
}

void qemu_set_log_filename(const char *filename)
{
    g_free(logfilename);
    logfilename = g_strdup(filename);
    qemu_log_close();
    qemu_set_log(qemu_loglevel);
}

const QEMULogItem qemu_log_items[] = {
    { CPU_LOG_TB_OUT_ASM, "out_asm",
      "show generated host assembly code for each compiled TB" },
    { CPU_LOG_TB_IN_ASM, "in_asm",
      "show target assembly code for each compiled TB" },
    { CPU_LOG_TB_OP, "op",
      "show micro ops for each compiled TB" },
    { CPU_LOG_TB_OP_OPT, "op_opt",
      "show micro ops (x86 only: before eflags optimization) and\n"
      "after liveness analysis" },
    { CPU_LOG_INT, "int",
      "show interrupts/exceptions in short format" },
    { CPU_LOG_EXEC, "exec",
      "show trace before each executed TB (lots of logs)" },
    { CPU_LOG_TB_CPU, "cpu",
      "show CPU state before block translation" },
    { CPU_LOG_MMU, "mmu",
      "log MMU-related activities" },
    { CPU_LOG_PCALL, "pcall",
      "x86 only: show protected mode far calls/returns/exceptions" },
    { CPU_LOG_RESET, "cpu_reset",
      "show CPU state before CPU resets" },
    { LOG_UNIMP, "unimp",
      "log unimplemented functionality" },
    { LOG_GUEST_ERROR, "guest_errors",
      "log when the guest OS does something invalid (eg accessing a\n"
      "non-existent register)" },
    { CPU_LOG_PAGE, "page",
      "dump pages at beginning of user mode emulation" },
    { CPU_LOG_TB_NOCHAIN, "nochain",
      "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
      "complete traces" },
    { 0, NULL, NULL },
};

static int cmp1(const char *s1, int n, const char *s2)
{
    if (strlen(s2) != n) {
        return 0;
    }
    return memcmp(s1, s2, n) == 0;
}

/* takes a comma separated list of log masks. Return 0 if error. */
int qemu_str_to_log_mask(const char *str)
{
    const QEMULogItem *item;
    int mask;
    const char *p, *p1;

    p = str;
    mask = 0;
    for (;;) {
        p1 = strchr(p, ',');
        if (!p1) {
            p1 = p + strlen(p);
        }
        if (cmp1(p,p1-p,"all")) {
            for (item = qemu_log_items; item->mask != 0; item++) {
                mask |= item->mask;
            }
#ifdef CONFIG_TRACE_LOG
        } else if (strncmp(p, "trace:", 6) == 0 && p + 6 != p1) {
            trace_enable_events(p + 6);
            mask |= LOG_TRACE;
#endif
        } else {
            for (item = qemu_log_items; item->mask != 0; item++) {
                if (cmp1(p, p1 - p, item->name)) {
                    goto found;
                }
            }
            return 0;
        found:
            mask |= item->mask;
        }
        if (*p1 != ',') {
            break;
        }
        p = p1 + 1;
    }
    return mask;
}

void qemu_print_log_usage(FILE *f)
{
    const QEMULogItem *item;
    fprintf(f, "Log items (comma separated):\n");
    for (item = qemu_log_items; item->mask != 0; item++) {
        fprintf(f, "%-15s %s\n", item->name, item->help);
    }
#ifdef CONFIG_TRACE_LOG
    fprintf(f, "trace:PATTERN   enable trace events\n");
    fprintf(f, "\nUse \"-d trace:help\" to get a list of trace events.\n\n");
#endif
}