1 files changed, 167 insertions, 0 deletions
diff --git a/include/qemu/log.h b/include/qemu/log.h
new file mode 100644
index 000000000..9b8066020
--- /dev/null
+++ b/include/qemu/log.h
@@ -0,0 +1,167 @@
+#ifndef QEMU_LOG_H
+#define QEMU_LOG_H
+
+/* A small part of this API is split into its own header */
+#include "qemu/log-for-trace.h"
+#include "qemu/rcu.h"
+
+typedef struct QemuLogFile {
+    struct rcu_head rcu;
+    FILE *fd;
+} QemuLogFile;
+
+/* Private global variable, don't use */
+extern QemuLogFile *qemu_logfile;
+
+
+/* 
+ * The new API:
+ *
+ */
+
+/* Log settings checking macros: */
+
+/* Returns true if qemu_log() will really write somewhere
+ */
+static inline bool qemu_log_enabled(void)
+{
+    return qemu_logfile != NULL;
+}
+
+/* Returns true if qemu_log() will write somewhere else than stderr
+ */
+static inline bool qemu_log_separate(void)
+{
+    QemuLogFile *logfile;
+    bool res = false;
+
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile && logfile->fd != stderr) {
+        res = true;
+    }
+    rcu_read_unlock();
+    return res;
+}
+
+#define CPU_LOG_TB_OUT_ASM (1 << 0)
+#define CPU_LOG_TB_IN_ASM  (1 << 1)
+#define CPU_LOG_TB_OP      (1 << 2)
+#define CPU_LOG_TB_OP_OPT  (1 << 3)
+#define CPU_LOG_INT        (1 << 4)
+#define CPU_LOG_EXEC       (1 << 5)
+#define CPU_LOG_PCALL      (1 << 6)
+#define CPU_LOG_TB_CPU     (1 << 8)
+#define CPU_LOG_RESET      (1 << 9)
+#define LOG_UNIMP          (1 << 10)
+#define LOG_GUEST_ERROR    (1 << 11)
+#define CPU_LOG_MMU        (1 << 12)
+#define CPU_LOG_TB_NOCHAIN (1 << 13)
+#define CPU_LOG_PAGE       (1 << 14)
+/* LOG_TRACE (1 << 15) is defined in log-for-trace.h */
+#define CPU_LOG_TB_OP_IND  (1 << 16)
+#define CPU_LOG_TB_FPU     (1 << 17)
+#define CPU_LOG_PLUGIN     (1 << 18)
+/* LOG_STRACE is used for user-mode strace logging. */
+#define LOG_STRACE         (1 << 19)
+
+/* Lock output for a series of related logs.  Since this is not needed
+ * for a single qemu_log / qemu_log_mask / qemu_log_mask_and_addr, we
+ * assume that qemu_loglevel_mask has already been tested, and that
+ * qemu_loglevel is never set when qemu_logfile is unset.
+ */
+
+static inline FILE *qemu_log_lock(void)
+{
+    QemuLogFile *logfile;
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile) {
+        qemu_flockfile(logfile->fd);
+        return logfile->fd;
+    } else {
+        return NULL;
+    }
+}
+
+static inline void qemu_log_unlock(FILE *fd)
+{
+    if (fd) {
+        qemu_funlockfile(fd);
+    }
+    rcu_read_unlock();
+}
+
+/* Logging functions: */
+
+/* vfprintf-like logging function
+ */
+static inline void GCC_FMT_ATTR(1, 0)
+qemu_log_vprintf(const char *fmt, va_list va)
+{
+    QemuLogFile *logfile;
+
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile) {
+        vfprintf(logfile->fd, fmt, va);
+    }
+    rcu_read_unlock();
+}
+
+/* log only if a bit is set on the current loglevel mask:
+ * @mask: bit to check in the mask
+ * @fmt: printf-style format string
+ * @args: optional arguments for format string
+ */
+#define qemu_log_mask(MASK, FMT, ...)                   \
+    do {                                                \
+        if (unlikely(qemu_loglevel_mask(MASK))) {       \
+            qemu_log(FMT, ## __VA_ARGS__);              \
+        }                                               \
+    } while (0)
+
+/* log only if a bit is set on the current loglevel mask
+ * and we are in the address range we care about:
+ * @mask: bit to check in the mask
+ * @addr: address to check in dfilter
+ * @fmt: printf-style format string
+ * @args: optional arguments for format string
+ */
+#define qemu_log_mask_and_addr(MASK, ADDR, FMT, ...)    \
+    do {                                                \
+        if (unlikely(qemu_loglevel_mask(MASK)) &&       \
+                     qemu_log_in_addr_range(ADDR)) {    \
+            qemu_log(FMT, ## __VA_ARGS__);              \
+        }                                               \
+    } while (0)
+
+/* Maintenance: */
+
+/* define log items */
+typedef struct QEMULogItem {
+    int mask;
+    const char *name;
+    const char *help;
+} QEMULogItem;
+
+extern const QEMULogItem qemu_log_items[];
+
+void qemu_set_log(int log_flags);
+void qemu_log_needs_buffers(void);
+void qemu_set_log_filename(const char *filename, Error **errp);
+void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
+bool qemu_log_in_addr_range(uint64_t addr);
+int qemu_str_to_log_mask(const char *str);
+
+/* Print a usage message listing all the valid logging categories
+ * to the specified FILE*.
+ */
+void qemu_print_log_usage(FILE *f);
+
+/* fflush() the log file */
+void qemu_log_flush(void);
+/* Close the log file */
+void qemu_log_close(void);
+
+#endif