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Implement log framework

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This patch gives users control over logging messages printed from the C
code using the LOG macros defined in debug.h Users now have the ability
to reduce the log_level at run time using the tf_log_set_max_level()
function. The default prefix string can be defined by platform by
overriding the `plat_log_get_prefix()` platform API which is also
introduced in this patch.

The new log framework results in saving of some RO data. For example,
when BL1 is built for FVP with LOG_LEVEL=LOG_LEVEL_VERBOSE, resulted
in saving 384 bytes of RO data and increase of 8 bytes of RW data. The
framework also adds about 108 bytes of code to the release build of FVP.

Fixes ARM-software/tf-issues#462

Change-Id: I476013d9c3deedfdd4c8b0b0f125665ba6250554
Co-authored-by: Eleanor Bonnici <Eleanor.bonnici@arm.com>
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
This commit is contained in:
Soby Mathew 2017-09-04 11:49:29 +01:00
parent 2d7e82823d
commit 7f56e9a31c
6 changed files with 122 additions and 6 deletions
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24
include/common/debug.h
View file

@ -27,47 +27,59 @@
#include <stdarg.h>
#include <stdio.h>
/*
* Define Log Markers corresponding to each log level which will
* be embedded in the format string and is expected by tf_log() to determine
* the log level.
*/
#define LOG_MARKER_ERROR "\xa" /* 10 */
#define LOG_MARKER_NOTICE "\x14" /* 20 */
#define LOG_MARKER_WARNING "\x1e" /* 30 */
#define LOG_MARKER_INFO "\x28" /* 40 */
#define LOG_MARKER_VERBOSE "\x32" /* 50 */
#if LOG_LEVEL >= LOG_LEVEL_NOTICE
# define NOTICE(...) tf_printf("NOTICE: " __VA_ARGS__)
# define NOTICE(...) tf_log(LOG_MARKER_NOTICE __VA_ARGS__)
#else
# define NOTICE(...)
#endif
#if LOG_LEVEL >= LOG_LEVEL_ERROR
# define ERROR(...) tf_printf("ERROR: " __VA_ARGS__)
# define ERROR(...) tf_log(LOG_MARKER_ERROR __VA_ARGS__)
#else
# define ERROR(...)
#endif
#if LOG_LEVEL >= LOG_LEVEL_WARNING
# define WARN(...) tf_printf("WARNING: " __VA_ARGS__)
# define WARN(...) tf_log(LOG_MARKER_WARNING __VA_ARGS__)
#else
# define WARN(...)
#endif
#if LOG_LEVEL >= LOG_LEVEL_INFO
# define INFO(...) tf_printf("INFO: " __VA_ARGS__)
# define INFO(...) tf_log(LOG_MARKER_INFO __VA_ARGS__)
#else
# define INFO(...)
#endif
#if LOG_LEVEL >= LOG_LEVEL_VERBOSE
# define VERBOSE(...) tf_printf("VERBOSE: " __VA_ARGS__)
# define VERBOSE(...) tf_log(LOG_MARKER_VERBOSE __VA_ARGS__)
#else
# define VERBOSE(...)
#endif
void __dead2 do_panic(void);
#define panic() do_panic()
/* Function called when stack protection check code detects a corrupted stack */
void __dead2 __stack_chk_fail(void);
void tf_log(const char *fmt, ...) __printflike(1, 2);
void tf_printf(const char *fmt, ...) __printflike(1, 2);
int tf_snprintf(char *s, size_t n, const char *fmt, ...) __printflike(3, 4);
void tf_vprintf(const char *fmt, va_list args);
void tf_string_print(const char *str);
void tf_log_set_max_level(unsigned int log_level);
#endif /* __ASSEMBLY__ */
#endif /* __DEBUG_H__ */