This change switches linux-user strace logging to use the newer `qemu_log` logging subsystem rather than the older `gemu_log` (notice the "g") logger. `qemu_log` has several advantages, namely that it allows logging to a file, and provides a more unified interface for configuration of logging (via the QEMU_LOG environment variable or options). This change introduces a new log mask: `LOG_STRACE` which is used for logging of user-mode strace messages. Reviewed-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Josh Kunz <jkz@google.com> Message-Id: <20200204025416.111409-3-jkz@google.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
168 lines
4.4 KiB
C
168 lines
4.4 KiB
C
#ifndef QEMU_LOG_H
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#define QEMU_LOG_H
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/* A small part of this API is split into its own header */
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#include "qemu/log-for-trace.h"
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#include "qemu/rcu.h"
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typedef struct QemuLogFile {
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struct rcu_head rcu;
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FILE *fd;
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} QemuLogFile;
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/* Private global variable, don't use */
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extern QemuLogFile *qemu_logfile;
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/*
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* The new API:
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*
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*/
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/* Log settings checking macros: */
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/* Returns true if qemu_log() will really write somewhere
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*/
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static inline bool qemu_log_enabled(void)
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{
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return qemu_logfile != NULL;
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}
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/* Returns true if qemu_log() will write somewhere else than stderr
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*/
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static inline bool qemu_log_separate(void)
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{
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QemuLogFile *logfile;
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bool res = false;
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rcu_read_lock();
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logfile = atomic_rcu_read(&qemu_logfile);
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if (logfile && logfile->fd != stderr) {
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res = true;
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}
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rcu_read_unlock();
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return res;
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}
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#define CPU_LOG_TB_OUT_ASM (1 << 0)
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#define CPU_LOG_TB_IN_ASM (1 << 1)
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#define CPU_LOG_TB_OP (1 << 2)
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#define CPU_LOG_TB_OP_OPT (1 << 3)
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#define CPU_LOG_INT (1 << 4)
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#define CPU_LOG_EXEC (1 << 5)
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#define CPU_LOG_PCALL (1 << 6)
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#define CPU_LOG_TB_CPU (1 << 8)
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#define CPU_LOG_RESET (1 << 9)
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#define LOG_UNIMP (1 << 10)
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#define LOG_GUEST_ERROR (1 << 11)
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#define CPU_LOG_MMU (1 << 12)
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#define CPU_LOG_TB_NOCHAIN (1 << 13)
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#define CPU_LOG_PAGE (1 << 14)
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/* LOG_TRACE (1 << 15) is defined in log-for-trace.h */
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#define CPU_LOG_TB_OP_IND (1 << 16)
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#define CPU_LOG_TB_FPU (1 << 17)
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#define CPU_LOG_PLUGIN (1 << 18)
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/* LOG_STRACE is used for user-mode strace logging. */
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#define LOG_STRACE (1 << 19)
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/* Lock output for a series of related logs. Since this is not needed
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* for a single qemu_log / qemu_log_mask / qemu_log_mask_and_addr, we
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* assume that qemu_loglevel_mask has already been tested, and that
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* qemu_loglevel is never set when qemu_logfile is unset.
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*/
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static inline FILE *qemu_log_lock(void)
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{
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QemuLogFile *logfile;
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rcu_read_lock();
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logfile = atomic_rcu_read(&qemu_logfile);
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if (logfile) {
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qemu_flockfile(logfile->fd);
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return logfile->fd;
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} else {
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return NULL;
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}
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}
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static inline void qemu_log_unlock(FILE *fd)
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{
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if (fd) {
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qemu_funlockfile(fd);
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}
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rcu_read_unlock();
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}
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/* Logging functions: */
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/* vfprintf-like logging function
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*/
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static inline void GCC_FMT_ATTR(1, 0)
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qemu_log_vprintf(const char *fmt, va_list va)
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{
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QemuLogFile *logfile;
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rcu_read_lock();
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logfile = atomic_rcu_read(&qemu_logfile);
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if (logfile) {
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vfprintf(logfile->fd, fmt, va);
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}
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rcu_read_unlock();
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}
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/* log only if a bit is set on the current loglevel mask:
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* @mask: bit to check in the mask
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* @fmt: printf-style format string
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* @args: optional arguments for format string
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*/
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#define qemu_log_mask(MASK, FMT, ...) \
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do { \
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if (unlikely(qemu_loglevel_mask(MASK))) { \
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qemu_log(FMT, ## __VA_ARGS__); \
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} \
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} while (0)
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/* log only if a bit is set on the current loglevel mask
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* and we are in the address range we care about:
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* @mask: bit to check in the mask
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* @addr: address to check in dfilter
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* @fmt: printf-style format string
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* @args: optional arguments for format string
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*/
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#define qemu_log_mask_and_addr(MASK, ADDR, FMT, ...) \
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do { \
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if (unlikely(qemu_loglevel_mask(MASK)) && \
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qemu_log_in_addr_range(ADDR)) { \
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qemu_log(FMT, ## __VA_ARGS__); \
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} \
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} while (0)
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/* Maintenance: */
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/* define log items */
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typedef struct QEMULogItem {
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int mask;
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const char *name;
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const char *help;
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} QEMULogItem;
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extern const QEMULogItem qemu_log_items[];
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void qemu_set_log(int log_flags);
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void qemu_log_needs_buffers(void);
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void qemu_set_log_filename(const char *filename, Error **errp);
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void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
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bool qemu_log_in_addr_range(uint64_t addr);
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int qemu_str_to_log_mask(const char *str);
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/* Print a usage message listing all the valid logging categories
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* to the specified FILE*.
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*/
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void qemu_print_log_usage(FILE *f);
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/* fflush() the log file */
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void qemu_log_flush(void);
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/* Close the log file */
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void qemu_log_close(void);
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#endif
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