util/log.c

   1 /*
   2  * Logging support
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu-common.h"
  22 #include "qemu/log.h"
  23 #include "trace/control.h"
  24
  25 static char *logfilename;
  26 FILE *qemu_logfile;
  27 int qemu_loglevel;
  28 static int log_append = 0;
  29
  30 void qemu_log(const char *fmt, ...)
  31 {
  32     va_list ap;
  33
  34     va_start(ap, fmt);
  35     if (qemu_logfile) {
  36         vfprintf(qemu_logfile, fmt, ap);
  37     }
  38     va_end(ap);
  39 }
  40
  41 void qemu_log_mask(int mask, const char *fmt, ...)
  42 {
  43     va_list ap;
  44
  45     va_start(ap, fmt);
  46     if ((qemu_loglevel & mask) && qemu_logfile) {
  47         vfprintf(qemu_logfile, fmt, ap);
  48     }
  49     va_end(ap);
  50 }
  51
  52 /* enable or disable low levels log */
  53 void do_qemu_set_log(int log_flags, bool use_own_buffers)
  54 {
  55     qemu_loglevel = log_flags;
  56 #ifdef CONFIG_TRACE_LOG
  57     qemu_loglevel |= LOG_TRACE;
  58 #endif
  59     if (qemu_loglevel && !qemu_logfile) {
  60         if (logfilename) {
  61             qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
  62             if (!qemu_logfile) {
  63                 perror(logfilename);
  64                 _exit(1);
  65             }
  66         } else {
  67             /* Default to stderr if no log file specified */
  68             qemu_logfile = stderr;
  69         }
  70         /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
  71         if (use_own_buffers) {
  72             static char logfile_buf[4096];
  73
  74             setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
  75         } else {
  76 #if defined(_WIN32)
  77             /* Win32 doesn't support line-buffering, so use unbuffered output. */
  78             setvbuf(qemu_logfile, NULL, _IONBF, 0);
  79 #else
  80             setvbuf(qemu_logfile, NULL, _IOLBF, 0);
  81 #endif
  82             log_append = 1;
  83         }
  84     }
  85     if (!qemu_loglevel && qemu_logfile) {
  86         qemu_log_close();
  87     }
  88 }
  89
  90 void qemu_set_log_filename(const char *filename)
  91 {
  92     g_free(logfilename);
  93     logfilename = g_strdup(filename);
  94     qemu_log_close();
  95     qemu_set_log(qemu_loglevel);
  96 }
  97
  98 const QEMULogItem qemu_log_items[] = {
  99     { CPU_LOG_TB_OUT_ASM, "out_asm",
 100       "show generated host assembly code for each compiled TB" },
 101     { CPU_LOG_TB_IN_ASM, "in_asm",
 102       "show target assembly code for each compiled TB" },
 103     { CPU_LOG_TB_OP, "op",
 104       "show micro ops for each compiled TB" },
 105     { CPU_LOG_TB_OP_OPT, "op_opt",
 106       "show micro ops (x86 only: before eflags optimization) and\n"
 107       "after liveness analysis" },
 108     { CPU_LOG_INT, "int",
 109       "show interrupts/exceptions in short format" },
 110     { CPU_LOG_EXEC, "exec",
 111       "show trace before each executed TB (lots of logs)" },
 112     { CPU_LOG_TB_CPU, "cpu",
 113       "show CPU state before block translation" },
 114     { CPU_LOG_MMU, "mmu",
 115       "log MMU-related activities" },
 116     { CPU_LOG_PCALL, "pcall",
 117       "x86 only: show protected mode far calls/returns/exceptions" },
 118     { CPU_LOG_RESET, "cpu_reset",
 119       "show CPU state before CPU resets" },
 120     { LOG_UNIMP, "unimp",
 121       "log unimplemented functionality" },
 122     { LOG_GUEST_ERROR, "guest_errors",
 123       "log when the guest OS does something invalid (eg accessing a\n"
 124       "non-existent register)" },
 125     { CPU_LOG_PAGE, "page",
 126       "dump pages at beginning of user mode emulation" },
 127     { CPU_LOG_TB_NOCHAIN, "nochain",
 128       "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
 129       "complete traces" },
 130     { 0, NULL, NULL },
 131 };
 132
 133 static int cmp1(const char *s1, int n, const char *s2)
 134 {
 135     if (strlen(s2) != n) {
 136         return 0;
 137     }
 138     return memcmp(s1, s2, n) == 0;
 139 }
 140
 141 /* takes a comma separated list of log masks. Return 0 if error. */
 142 int qemu_str_to_log_mask(const char *str)
 143 {
 144     const QEMULogItem *item;
 145     int mask;
 146     const char *p, *p1;
 147
 148     p = str;
 149     mask = 0;
 150     for (;;) {
 151         p1 = strchr(p, ',');
 152         if (!p1) {
 153             p1 = p + strlen(p);
 154         }
 155         if (cmp1(p,p1-p,"all")) {
 156             for (item = qemu_log_items; item->mask != 0; item++) {
 157                 mask |= item->mask;
 158             }
 159 #ifdef CONFIG_TRACE_LOG
 160         } else if (strncmp(p, "trace:", 6) == 0 && p + 6 != p1) {
 161             trace_enable_events(p + 6);
 162             mask |= LOG_TRACE;
 163 #endif
 164         } else {
 165             for (item = qemu_log_items; item->mask != 0; item++) {
 166                 if (cmp1(p, p1 - p, item->name)) {
 167                     goto found;
 168                 }
 169             }
 170             return 0;
 171         found:
 172             mask |= item->mask;
 173         }
 174         if (*p1 != ',') {
 175             break;
 176         }
 177         p = p1 + 1;
 178     }
 179     return mask;
 180 }
 181
 182 void qemu_print_log_usage(FILE *f)
 183 {
 184     const QEMULogItem *item;
 185     fprintf(f, "Log items (comma separated):\n");
 186     for (item = qemu_log_items; item->mask != 0; item++) {
 187         fprintf(f, "%-15s %s\n", item->name, item->help);
 188     }
 189 #ifdef CONFIG_TRACE_LOG
 190     fprintf(f, "trace:PATTERN   enable trace events\n");
 191     fprintf(f, "\nUse \"-d trace:help\" to get a list of trace events.\n\n");
 192 #endif
 193 }