log: move qemu-log.c into util/ directory

log will become common facility with tracepoints support in next step.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1452174932-28657-9-git-send-email-den@openvz.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 180 insertions, 0 deletions

diff --git a/util/Makefile.objs b/util/Makefile.objs
index 8620a80b45..a8a777ec40 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -31,3 +31,4 @@ util-obj-y += coroutine-$(CONFIG_COROUTINE_BACKEND).o
 util-obj-y += buffer.o
 util-obj-y += timed-average.o
 util-obj-y += base64.o
+util-obj-y += log.o
diff --git a/util/log.c b/util/log.c
new file mode 100644
index 0000000000..901b93087d
--- /dev/null
+++ b/util/log.c
@@ -0,0 +1,179 @@
+/*
+ * Logging support
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu-common.h"
+#include "qemu/log.h"
+
+static char *logfilename;
+FILE *qemu_logfile;
+int qemu_loglevel;
+static int log_append = 0;
+
+void qemu_log(const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    if (qemu_logfile) {
+        vfprintf(qemu_logfile, fmt, ap);
+    }
+    va_end(ap);
+}
+
+void qemu_log_mask(int mask, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    if ((qemu_loglevel & mask) && qemu_logfile) {
+        vfprintf(qemu_logfile, fmt, ap);
+    }
+    va_end(ap);
+}
+
+/* enable or disable low levels log */
+void do_qemu_set_log(int log_flags, bool use_own_buffers)
+{
+    qemu_loglevel = log_flags;
+    if (qemu_loglevel && !qemu_logfile) {
+        if (logfilename) {
+            qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
+            if (!qemu_logfile) {
+                perror(logfilename);
+                _exit(1);
+            }
+        } else {
+            /* Default to stderr if no log file specified */
+            qemu_logfile = stderr;
+        }
+        /* must avoid mmap() usage of glibc by setting a buffer "by hand" */
+        if (use_own_buffers) {
+            static char logfile_buf[4096];
+
+            setvbuf(qemu_logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
+        } else {
+#if defined(_WIN32)
+            /* Win32 doesn't support line-buffering, so use unbuffered output. */
+            setvbuf(qemu_logfile, NULL, _IONBF, 0);
+#else
+            setvbuf(qemu_logfile, NULL, _IOLBF, 0);
+#endif
+            log_append = 1;
+        }
+    }
+    if (!qemu_loglevel && qemu_logfile) {
+        qemu_log_close();
+    }
+}
+
+void qemu_set_log_filename(const char *filename)
+{
+    g_free(logfilename);
+    logfilename = g_strdup(filename);
+    qemu_log_close();
+    qemu_set_log(qemu_loglevel);
+}
+
+const QEMULogItem qemu_log_items[] = {
+    { CPU_LOG_TB_OUT_ASM, "out_asm",
+      "show generated host assembly code for each compiled TB" },
+    { CPU_LOG_TB_IN_ASM, "in_asm",
+      "show target assembly code for each compiled TB" },
+    { CPU_LOG_TB_OP, "op",
+      "show micro ops for each compiled TB" },
+    { CPU_LOG_TB_OP_OPT, "op_opt",
+      "show micro ops (x86 only: before eflags optimization) and\n"
+      "after liveness analysis" },
+    { CPU_LOG_INT, "int",
+      "show interrupts/exceptions in short format" },
+    { CPU_LOG_EXEC, "exec",
+      "show trace before each executed TB (lots of logs)" },
+    { CPU_LOG_TB_CPU, "cpu",
+      "show CPU state before block translation" },
+    { CPU_LOG_MMU, "mmu",
+      "log MMU-related activities" },
+    { CPU_LOG_PCALL, "pcall",
+      "x86 only: show protected mode far calls/returns/exceptions" },
+    { CPU_LOG_RESET, "cpu_reset",
+      "show CPU state before CPU resets" },
+    { LOG_UNIMP, "unimp",
+      "log unimplemented functionality" },
+    { LOG_GUEST_ERROR, "guest_errors",
+      "log when the guest OS does something invalid (eg accessing a\n"
+      "non-existent register)" },
+    { CPU_LOG_PAGE, "page",
+      "dump pages at beginning of user mode emulation" },
+    { CPU_LOG_TB_NOCHAIN, "nochain",
+      "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
+      "complete traces" },
+    { 0, NULL, NULL },
+};
+
+static int cmp1(const char *s1, int n, const char *s2)
+{
+    if (strlen(s2) != n) {
+        return 0;
+    }
+    return memcmp(s1, s2, n) == 0;
+}
+
+/* takes a comma separated list of log masks. Return 0 if error. */
+int qemu_str_to_log_mask(const char *str)
+{
+    const QEMULogItem *item;
+    int mask;
+    const char *p, *p1;
+
+    p = str;
+    mask = 0;
+    for (;;) {
+        p1 = strchr(p, ',');
+        if (!p1) {
+            p1 = p + strlen(p);
+        }
+        if (cmp1(p,p1-p,"all")) {
+            for (item = qemu_log_items; item->mask != 0; item++) {
+                mask |= item->mask;
+            }
+        } else {
+            for (item = qemu_log_items; item->mask != 0; item++) {
+                if (cmp1(p, p1 - p, item->name)) {
+                    goto found;
+                }
+            }
+            return 0;
+        }
+    found:
+        mask |= item->mask;
+        if (*p1 != ',') {
+            break;
+        }
+        p = p1 + 1;
+    }
+    return mask;
+}
+
+void qemu_print_log_usage(FILE *f)
+{
+    const QEMULogItem *item;
+    fprintf(f, "Log items (comma separated):\n");
+    for (item = qemu_log_items; item->mask != 0; item++) {
+        fprintf(f, "%-10s %s\n", item->name, item->help);
+    }
+}