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