LXR qemu/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
  23static char *logfilename;
  24FILE *qemu_logfile;
  25int qemu_loglevel;
  26static int log_append = 0;
  27
  28void 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
  39void 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 */
  51void 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
  85void 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
  93const 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    { 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
 125static 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. */
 134int qemu_str_to_log_mask(const char *str)
 135{
 136    const QEMULogItem *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 = qemu_log_items; item->mask != 0; item++) {
 149                mask |= item->mask;
 150            }
 151        } else {
 152            for (item = qemu_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}
 168
 169void qemu_print_log_usage(FILE *f)
 170{
 171    const QEMULogItem *item;
 172    fprintf(f, "Log items (comma separated):\n");
 173    for (item = qemu_log_items; item->mask != 0; item++) {
 174        fprintf(f, "%-10s %s\n", item->name, item->help);
 175    }
 176}
 177