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 "qemu/range.h"
  24 #include "qemu/error-report.h"
  25 #include "qemu/cutils.h"
  26 #include "trace/control.h"
  27
  28 static char *logfilename;
  29 FILE *qemu_logfile;
  30 int qemu_loglevel;
  31 static int log_append = 0;
  32 static GArray *debug_regions;
  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 /* enable or disable low levels log */
  46 void do_qemu_set_log(int log_flags, bool use_own_buffers)
  47 {
  48     qemu_loglevel = log_flags;
  49 #ifdef CONFIG_TRACE_LOG
  50     qemu_loglevel |= LOG_TRACE;
  51 #endif
  52     if (!qemu_logfile &&
  53         (is_daemonized() ? logfilename != NULL : qemu_loglevel)) {
  54         if (logfilename) {
  55             qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
  56             if (!qemu_logfile) {
  57                 perror(logfilename);
  58                 _exit(1);
  59             }
  60             /* In case we are a daemon redirect stderr to logfile */
  61             if (is_daemonized()) {
  62                 dup2(fileno(qemu_logfile), STDERR_FILENO);
  63                 fclose(qemu_logfile);
  64                 /* This will skip closing logfile in qemu_log_close() */
  65                 qemu_logfile = stderr;
  66             }
  67         } else {
  68             /* Default to stderr if no log file specified */
  69             assert(!is_daemonized());
  70             qemu_logfile = stderr;
  71         }
  72         /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
  73         if (use_own_buffers) {
  74             static char logfile_buf[4096];
  75
  76             setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
  77         } else {
  78 #if defined(_WIN32)
  79             /* Win32 doesn't support line-buffering, so use unbuffered output. */
  80             setvbuf(qemu_logfile, NULL, _IONBF, 0);
  81 #else
  82             setvbuf(qemu_logfile, NULL, _IOLBF, 0);
  83 #endif
  84             log_append = 1;
  85         }
  86     }
  87     if (qemu_logfile &&
  88         (is_daemonized() ? logfilename == NULL : !qemu_loglevel)) {
  89         qemu_log_close();
  90     }
  91 }
  92
  93 void qemu_set_log_filename(const char *filename)
  94 {
  95     g_free(logfilename);
  96     logfilename = g_strdup(filename);
  97     qemu_log_close();
  98     qemu_set_log(qemu_loglevel);
  99 }
 100
 101 /* Returns true if addr is in our debug filter or no filter defined
 102  */
 103 bool qemu_log_in_addr_range(uint64_t addr)
 104 {
 105     if (debug_regions) {
 106         int i = 0;
 107         for (i = 0; i < debug_regions->len; i++) {
 108             struct Range *range = &g_array_index(debug_regions, Range, i);
 109             if (addr >= range->begin && addr <= range->end) {
 110                 return true;
 111             }
 112         }
 113         return false;
 114     } else {
 115         return true;
 116     }
 117 }
 118
 119
 120 void qemu_set_dfilter_ranges(const char *filter_spec)
 121 {
 122     gchar **ranges = g_strsplit(filter_spec, ",", 0);
 123     if (ranges) {
 124         gchar **next = ranges;
 125         gchar *r = *next++;
 126         debug_regions = g_array_sized_new(FALSE, FALSE,
 127                                           sizeof(Range), g_strv_length(ranges));
 128         while (r) {
 129             char *range_op = strstr(r, "-");
 130             char *r2 = range_op ? range_op + 1 : NULL;
 131             if (!range_op) {
 132                 range_op = strstr(r, "+");
 133                 r2 = range_op ? range_op + 1 : NULL;
 134             }
 135             if (!range_op) {
 136                 range_op = strstr(r, "..");
 137                 r2 = range_op ? range_op + 2 : NULL;
 138             }
 139             if (range_op) {
 140                 const char *e = NULL;
 141                 uint64_t r1val, r2val;
 142
 143                 if ((qemu_strtoull(r, &e, 0, &r1val) == 0) &&
 144                     (qemu_strtoull(r2, NULL, 0, &r2val) == 0) &&
 145                     r2val > 0) {
 146                     struct Range range;
 147
 148                     g_assert(e == range_op);
 149
 150                     switch (*range_op) {
 151                     case '+':
 152                     {
 153                         range.begin = r1val;
 154                         range.end = r1val + (r2val - 1);
 155                         break;
 156                     }
 157                     case '-':
 158                     {
 159                         range.end = r1val;
 160                         range.begin = r1val - (r2val - 1);
 161                         break;
 162                     }
 163                     case '.':
 164                         range.begin = r1val;
 165                         range.end = r2val;
 166                         break;
 167                     default:
 168                         g_assert_not_reached();
 169                     }
 170                     g_array_append_val(debug_regions, range);
 171
 172                 } else {
 173                     g_error("Failed to parse range in: %s", r);
 174                 }
 175             } else {
 176                 g_error("Bad range specifier in: %s", r);
 177             }
 178             r = *next++;
 179         }
 180         g_strfreev(ranges);
 181     }
 182 }
 183
 184 const QEMULogItem qemu_log_items[] = {
 185     { CPU_LOG_TB_OUT_ASM, "out_asm",
 186       "show generated host assembly code for each compiled TB" },
 187     { CPU_LOG_TB_IN_ASM, "in_asm",
 188       "show target assembly code for each compiled TB" },
 189     { CPU_LOG_TB_OP, "op",
 190       "show micro ops for each compiled TB" },
 191     { CPU_LOG_TB_OP_OPT, "op_opt",
 192       "show micro ops (x86 only: before eflags optimization) and\n"
 193       "after liveness analysis" },
 194     { CPU_LOG_INT, "int",
 195       "show interrupts/exceptions in short format" },
 196     { CPU_LOG_EXEC, "exec",
 197       "show trace before each executed TB (lots of logs)" },
 198     { CPU_LOG_TB_CPU, "cpu",
 199       "show CPU registers before entering a TB (lots of logs)" },
 200     { CPU_LOG_MMU, "mmu",
 201       "log MMU-related activities" },
 202     { CPU_LOG_PCALL, "pcall",
 203       "x86 only: show protected mode far calls/returns/exceptions" },
 204     { CPU_LOG_RESET, "cpu_reset",
 205       "show CPU state before CPU resets" },
 206     { LOG_UNIMP, "unimp",
 207       "log unimplemented functionality" },
 208     { LOG_GUEST_ERROR, "guest_errors",
 209       "log when the guest OS does something invalid (eg accessing a\n"
 210       "non-existent register)" },
 211     { CPU_LOG_PAGE, "page",
 212       "dump pages at beginning of user mode emulation" },
 213     { CPU_LOG_TB_NOCHAIN, "nochain",
 214       "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
 215       "complete traces" },
 216     { 0, NULL, NULL },
 217 };
 218
 219 static int cmp1(const char *s1, int n, const char *s2)
 220 {
 221     if (strlen(s2) != n) {
 222         return 0;
 223     }
 224     return memcmp(s1, s2, n) == 0;
 225 }
 226
 227 /* takes a comma separated list of log masks. Return 0 if error. */
 228 int qemu_str_to_log_mask(const char *str)
 229 {
 230     const QEMULogItem *item;
 231     int mask;
 232     const char *p, *p1;
 233
 234     p = str;
 235     mask = 0;
 236     for (;;) {
 237         p1 = strchr(p, ',');
 238         if (!p1) {
 239             p1 = p + strlen(p);
 240         }
 241         if (cmp1(p,p1-p,"all")) {
 242             for (item = qemu_log_items; item->mask != 0; item++) {
 243                 mask |= item->mask;
 244             }
 245 #ifdef CONFIG_TRACE_LOG
 246         } else if (strncmp(p, "trace:", 6) == 0 && p + 6 != p1) {
 247             trace_enable_events(p + 6);
 248             mask |= LOG_TRACE;
 249 #endif
 250         } else {
 251             for (item = qemu_log_items; item->mask != 0; item++) {
 252                 if (cmp1(p, p1 - p, item->name)) {
 253                     goto found;
 254                 }
 255             }
 256             return 0;
 257         found:
 258             mask |= item->mask;
 259         }
 260         if (*p1 != ',') {
 261             break;
 262         }
 263         p = p1 + 1;
 264     }
 265     return mask;
 266 }
 267
 268 void qemu_print_log_usage(FILE *f)
 269 {
 270     const QEMULogItem *item;
 271     fprintf(f, "Log items (comma separated):\n");
 272     for (item = qemu_log_items; item->mask != 0; item++) {
 273         fprintf(f, "%-15s %s\n", item->name, item->help);
 274     }
 275 #ifdef CONFIG_TRACE_LOG
 276     fprintf(f, "trace:PATTERN   enable trace events\n");
 277     fprintf(f, "\nUse \"-d trace:help\" to get a list of trace events.\n\n");
 278 #endif
 279 }