qemu-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-common.h"
  21 #include "qemu/log.h"
  22
  23 #ifdef WIN32
  24 #define DEFAULT_LOGFILENAME "qemu.log"
  25 #else
  26 #define DEFAULT_LOGFILENAME "/tmp/qemu.log"
  27 #endif
  28
  29 static char *logfilename;
  30 FILE *qemu_logfile;
  31 int qemu_loglevel;
  32 static int log_append = 0;
  33
  34 void qemu_log(const char *fmt, ...)
  35 {
  36     va_list ap;
  37
  38     va_start(ap, fmt);
  39     if (qemu_logfile) {
  40         vfprintf(qemu_logfile, fmt, ap);
  41     }
  42     va_end(ap);
  43 }
  44
  45 void qemu_log_mask(int mask, const char *fmt, ...)
  46 {
  47     va_list ap;
  48
  49     va_start(ap, fmt);
  50     if ((qemu_loglevel & mask) && qemu_logfile) {
  51         vfprintf(qemu_logfile, fmt, ap);
  52     }
  53     va_end(ap);
  54 }
  55
  56 /* enable or disable low levels log */
  57 void do_qemu_set_log(int log_flags, bool use_own_buffers)
  58 {
  59     const char *fname = logfilename ?: DEFAULT_LOGFILENAME;
  60
  61     qemu_loglevel = log_flags;
  62     if (qemu_loglevel && !qemu_logfile) {
  63         qemu_logfile = fopen(fname, log_append ? "a" : "w");
  64         if (!qemu_logfile) {
  65             perror(fname);
  66             _exit(1);
  67         }
  68         /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
  69         if (use_own_buffers) {
  70             static char logfile_buf[4096];
  71
  72             setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
  73         } else {
  74 #if defined(_WIN32)
  75             /* Win32 doesn't support line-buffering, so use unbuffered output. */
  76             setvbuf(qemu_logfile, NULL, _IONBF, 0);
  77 #else
  78             setvbuf(qemu_logfile, NULL, _IOLBF, 0);
  79 #endif
  80             log_append = 1;
  81         }
  82     }
  83     if (!qemu_loglevel && qemu_logfile) {
  84         fclose(qemu_logfile);
  85         qemu_logfile = NULL;
  86     }
  87 }
  88
  89 void qemu_set_log_filename(const char *filename)
  90 {
  91     g_free(logfilename);
  92     logfilename = g_strdup(filename);
  93     if (qemu_logfile) {
  94         fclose(qemu_logfile);
  95         qemu_logfile = NULL;
  96     }
  97     qemu_set_log(qemu_loglevel);
  98 }
  99
 100 const QEMULogItem qemu_log_items[] = {
 101     { CPU_LOG_TB_OUT_ASM, "out_asm",
 102       "show generated host assembly code for each compiled TB" },
 103     { CPU_LOG_TB_IN_ASM, "in_asm",
 104       "show target assembly code for each compiled TB" },
 105     { CPU_LOG_TB_OP, "op",
 106       "show micro ops for each compiled TB" },
 107     { CPU_LOG_TB_OP_OPT, "op_opt",
 108       "show micro ops (x86 only: before eflags optimization) and\n"
 109       "after liveness analysis" },
 110     { CPU_LOG_INT, "int",
 111       "show interrupts/exceptions in short format" },
 112     { CPU_LOG_EXEC, "exec",
 113       "show trace before each executed TB (lots of logs)" },
 114     { CPU_LOG_TB_CPU, "cpu",
 115       "show CPU state before block translation" },
 116     { CPU_LOG_PCALL, "pcall",
 117       "x86 only: show protected mode far calls/returns/exceptions" },
 118     { CPU_LOG_RESET, "cpu_reset",
 119       "x86 only: show CPU state before CPU resets" },
 120     { CPU_LOG_IOPORT, "ioport",
 121       "show all i/o ports accesses" },
 122     { LOG_UNIMP, "unimp",
 123       "log unimplemented functionality" },
 124     { LOG_GUEST_ERROR, "guest_errors",
 125       "log when the guest OS does something invalid (eg accessing a\n"
 126       "non-existent register)" },
 127     { 0, NULL, NULL },
 128 };
 129
 130 static int cmp1(const char *s1, int n, const char *s2)
 131 {
 132     if (strlen(s2) != n) {
 133         return 0;
 134     }
 135     return memcmp(s1, s2, n) == 0;
 136 }
 137
 138 /* takes a comma separated list of log masks. Return 0 if error. */
 139 int qemu_str_to_log_mask(const char *str)
 140 {
 141     const QEMULogItem *item;
 142     int mask;
 143     const char *p, *p1;
 144
 145     p = str;
 146     mask = 0;
 147     for (;;) {
 148         p1 = strchr(p, ',');
 149         if (!p1) {
 150             p1 = p + strlen(p);
 151         }
 152         if (cmp1(p,p1-p,"all")) {
 153             for (item = qemu_log_items; item->mask != 0; item++) {
 154                 mask |= item->mask;
 155             }
 156         } else {
 157             for (item = qemu_log_items; item->mask != 0; item++) {
 158                 if (cmp1(p, p1 - p, item->name)) {
 159                     goto found;
 160                 }
 161             }
 162             return 0;
 163         }
 164     found:
 165         mask |= item->mask;
 166         if (*p1 != ',') {
 167             break;
 168         }
 169         p = p1 + 1;
 170     }
 171     return mask;
 172 }
 173
 174 void qemu_print_log_usage(FILE *f)
 175 {
 176     const QEMULogItem *item;
 177     fprintf(f, "Log items (comma separated):\n");
 178     for (item = qemu_log_items; item->mask != 0; item++) {
 179         fprintf(f, "%-10s %s\n", item->name, item->help);
 180     }
 181 }