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 *logfile;
  29 int loglevel;
  30 static int log_append = 0;
  31
  32 /* enable or disable low levels log */
  33 void cpu_set_log(int log_flags)
  34 {
  35     loglevel = log_flags;
  36     if (loglevel && !logfile) {
  37         logfile = fopen(logfilename, log_append ? "a" : "w");
  38         if (!logfile) {
  39             perror(logfilename);
  40             _exit(1);
  41         }
  42 #if !defined(CONFIG_SOFTMMU)
  43         /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
  44         {
  45             static char logfile_buf[4096];
  46             setvbuf(logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
  47         }
  48 #elif defined(_WIN32)
  49         /* Win32 doesn't support line-buffering, so use unbuffered output. */
  50         setvbuf(logfile, NULL, _IONBF, 0);
  51 #else
  52         setvbuf(logfile, NULL, _IOLBF, 0);
  53 #endif
  54         log_append = 1;
  55     }
  56     if (!loglevel && logfile) {
  57         fclose(logfile);
  58         logfile = NULL;
  59     }
  60 }
  61
  62 void cpu_set_log_filename(const char *filename)
  63 {
  64     logfilename = strdup(filename);
  65     if (logfile) {
  66         fclose(logfile);
  67         logfile = NULL;
  68     }
  69     cpu_set_log(loglevel);
  70 }
  71
  72 const CPULogItem cpu_log_items[] = {
  73     { CPU_LOG_TB_OUT_ASM, "out_asm",
  74       "show generated host assembly code for each compiled TB" },
  75     { CPU_LOG_TB_IN_ASM, "in_asm",
  76       "show target assembly code for each compiled TB" },
  77     { CPU_LOG_TB_OP, "op",
  78       "show micro ops for each compiled TB" },
  79     { CPU_LOG_TB_OP_OPT, "op_opt",
  80       "show micro ops "
  81 #ifdef TARGET_I386
  82       "before eflags optimization and "
  83 #endif
  84       "after liveness analysis" },
  85     { CPU_LOG_INT, "int",
  86       "show interrupts/exceptions in short format" },
  87     { CPU_LOG_EXEC, "exec",
  88       "show trace before each executed TB (lots of logs)" },
  89     { CPU_LOG_TB_CPU, "cpu",
  90       "show CPU state before block translation" },
  91 #ifdef TARGET_I386
  92     { CPU_LOG_PCALL, "pcall",
  93       "show protected mode far calls/returns/exceptions" },
  94     { CPU_LOG_RESET, "cpu_reset",
  95       "show CPU state before CPU resets" },
  96 #endif
  97 #ifdef DEBUG_IOPORT
  98     { CPU_LOG_IOPORT, "ioport",
  99       "show all i/o ports accesses" },
 100 #endif
 101     { 0, NULL, NULL },
 102 };
 103
 104 static int cmp1(const char *s1, int n, const char *s2)
 105 {
 106     if (strlen(s2) != n) {
 107         return 0;
 108     }
 109     return memcmp(s1, s2, n) == 0;
 110 }
 111
 112 /* takes a comma separated list of log masks. Return 0 if error. */
 113 int cpu_str_to_log_mask(const char *str)
 114 {
 115     const CPULogItem *item;
 116     int mask;
 117     const char *p, *p1;
 118
 119     p = str;
 120     mask = 0;
 121     for (;;) {
 122         p1 = strchr(p, ',');
 123         if (!p1) {
 124             p1 = p + strlen(p);
 125         }
 126         if (cmp1(p,p1-p,"all")) {
 127             for (item = cpu_log_items; item->mask != 0; item++) {
 128                 mask |= item->mask;
 129             }
 130         } else {
 131             for (item = cpu_log_items; item->mask != 0; item++) {
 132                 if (cmp1(p, p1 - p, item->name)) {
 133                     goto found;
 134                 }
 135             }
 136             return 0;
 137         }
 138     found:
 139         mask |= item->mask;
 140         if (*p1 != ',') {
 141             break;
 142         }
 143         p = p1 + 1;
 144     }
 145     return mask;
 146 }