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 static char *logfilename;
  24 FILE *qemu_logfile;
  25 int qemu_loglevel;
  26 static int log_append = 0;
  27
  28 void qemu_log(const char *fmt, ...)
  29 {
  30     va_list ap;
  31
  32     va_start(ap, fmt);
  33     if (qemu_logfile) {
  34         vfprintf(qemu_logfile, fmt, ap);
  35     }
  36     va_end(ap);
  37 }
  38
  39 void qemu_log_mask(int mask, const char *fmt, ...)
  40 {
  41     va_list ap;
  42
  43     va_start(ap, fmt);
  44     if ((qemu_loglevel & mask) && qemu_logfile) {
  45         vfprintf(qemu_logfile, fmt, ap);
  46     }
  47     va_end(ap);
  48 }
  49
  50 /* enable or disable low levels log */
  51 void do_qemu_set_log(int log_flags, bool use_own_buffers)
  52 {
  53     qemu_loglevel = log_flags;
  54     if (qemu_loglevel && !qemu_logfile) {
  55         if (logfilename) {
  56             qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
  57             if (!qemu_logfile) {
  58                 perror(logfilename);
  59                 _exit(1);
  60             }
  61         } else {
  62             /* Default to stderr if no log file specified */
  63             qemu_logfile = stderr;
  64         }
  65         /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
  66         if (use_own_buffers) {
  67             static char logfile_buf[4096];
  68
  69             setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
  70         } else {
  71 #if defined(_WIN32)
  72             /* Win32 doesn't support line-buffering, so use unbuffered output. */
  73             setvbuf(qemu_logfile, NULL, _IONBF, 0);
  74 #else
  75             setvbuf(qemu_logfile, NULL, _IOLBF, 0);
  76 #endif
  77             log_append = 1;
  78         }
  79     }
  80     if (!qemu_loglevel && qemu_logfile) {
  81         qemu_log_close();
  82     }
  83 }
  84
  85 void qemu_set_log_filename(const char *filename)
  86 {
  87     g_free(logfilename);
  88     logfilename = g_strdup(filename);
  89     qemu_log_close();
  90     qemu_set_log(qemu_loglevel);
  91 }
  92
  93 const QEMULogItem qemu_log_items[] = {
  94     { CPU_LOG_TB_OUT_ASM, "out_asm",
  95       "show generated host assembly code for each compiled TB" },
  96     { CPU_LOG_TB_IN_ASM, "in_asm",
  97       "show target assembly code for each compiled TB" },
  98     { CPU_LOG_TB_OP, "op",
  99       "show micro ops for each compiled TB" },
 100     { CPU_LOG_TB_OP_OPT, "op_opt",
 101       "show micro ops (x86 only: before eflags optimization) and\n"
 102       "after liveness analysis" },
 103     { CPU_LOG_INT, "int",
 104       "show interrupts/exceptions in short format" },
 105     { CPU_LOG_EXEC, "exec",
 106       "show trace before each executed TB (lots of logs)" },
 107     { CPU_LOG_TB_CPU, "cpu",
 108       "show CPU state before block translation" },
 109     { CPU_LOG_MMU, "mmu",
 110       "log MMU-related activities" },
 111     { CPU_LOG_PCALL, "pcall",
 112       "x86 only: show protected mode far calls/returns/exceptions" },
 113     { CPU_LOG_RESET, "cpu_reset",
 114       "show CPU state before CPU resets" },
 115     { LOG_UNIMP, "unimp",
 116       "log unimplemented functionality" },
 117     { LOG_GUEST_ERROR, "guest_errors",
 118       "log when the guest OS does something invalid (eg accessing a\n"
 119       "non-existent register)" },
 120     { CPU_LOG_PAGE, "page",
 121       "dump pages at beginning of user mode emulation" },
 122     { CPU_LOG_TB_NOCHAIN, "nochain",
 123       "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
 124       "complete traces" },
 125     { 0, NULL, NULL },
 126 };
 127
 128 static int cmp1(const char *s1, int n, const char *s2)
 129 {
 130     if (strlen(s2) != n) {
 131         return 0;
 132     }
 133     return memcmp(s1, s2, n) == 0;
 134 }
 135
 136 /* takes a comma separated list of log masks. Return 0 if error. */
 137 int qemu_str_to_log_mask(const char *str)
 138 {
 139     const QEMULogItem *item;
 140     int mask;
 141     const char *p, *p1;
 142
 143     p = str;
 144     mask = 0;
 145     for (;;) {
 146         p1 = strchr(p, ',');
 147         if (!p1) {
 148             p1 = p + strlen(p);
 149         }
 150         if (cmp1(p,p1-p,"all")) {
 151             for (item = qemu_log_items; item->mask != 0; item++) {
 152                 mask |= item->mask;
 153             }
 154         } else {
 155             for (item = qemu_log_items; item->mask != 0; item++) {
 156                 if (cmp1(p, p1 - p, item->name)) {
 157                     goto found;
 158                 }
 159             }
 160             return 0;
 161         }
 162     found:
 163         mask |= item->mask;
 164         if (*p1 != ',') {
 165             break;
 166         }
 167         p = p1 + 1;
 168     }
 169     return mask;
 170 }
 171
 172 void qemu_print_log_usage(FILE *f)
 173 {
 174     const QEMULogItem *item;
 175     fprintf(f, "Log items (comma separated):\n");
 176     for (item = qemu_log_items; item->mask != 0; item++) {
 177         fprintf(f, "%-10s %s\n", item->name, item->help);
 178     }
 179 }