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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH 2/8] lib/ukdebug: Register a tracepoint
Create a 'special' section .uk_tracepoints_list, where we will be
storing static definitions of tracepoints. This section is need only
offline, so it will exist only in *.dbg image.
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
lib/ukdebug/Config.uk | 9 ++++
lib/ukdebug/Makefile.uk | 3 ++
lib/ukdebug/extra.ld | 23 +++++++++
lib/ukdebug/include/uk/trace.h | 88 ++++++++++++++++++++++++++++++++++
4 files changed, 123 insertions(+)
create mode 100644 lib/ukdebug/extra.ld
diff --git a/lib/ukdebug/Config.uk b/lib/ukdebug/Config.uk
index 746ac3de..ab238aa0 100644
--- a/lib/ukdebug/Config.uk
+++ b/lib/ukdebug/Config.uk
@@ -75,4 +75,13 @@ config LIBUKDEBUG_ENABLE_ASSERT
help
Build code with assertions.
+menuconfig LIBUKDEBUG_TRACEPOINTS
+ bool "enable tracepoints"
+ default n
+if LIBUKDEBUG_TRACEPOINTS
+config LIBUKDEBUG_ALL_TRACEPOINTS
+ bool "enable all tracepoints at once"
+ default n
+endif
+
endif
diff --git a/lib/ukdebug/Makefile.uk b/lib/ukdebug/Makefile.uk
index 4aaa5189..abc340dd 100644
--- a/lib/ukdebug/Makefile.uk
+++ b/lib/ukdebug/Makefile.uk
@@ -8,3 +8,6 @@ LIBUKDEBUG_CXXFLAGS-y += -D__IN_LIBUKDEBUG__
LIBUKDEBUG_SRCS-y += $(LIBUKDEBUG_BASE)/print.c
LIBUKDEBUG_SRCS-y += $(LIBUKDEBUG_BASE)/hexdump.c
+
+EXTRA_LD_SCRIPT-$(CONFIG_LIBVFSCORE) += $(LIBUKDEBUG_BASE)/extra.ld
+STRIP_SECTIONS_FLAGS-$(CONFIG_LIBUKDEBUG_TRACEPOINTS) += -R
.uk_tracepoints_list
diff --git a/lib/ukdebug/extra.ld b/lib/ukdebug/extra.ld
new file mode 100644
index 00000000..43154f9d
--- /dev/null
+++ b/lib/ukdebug/extra.ld
@@ -0,0 +1,23 @@
+SECTIONS
+{
+ .uk_tracepoints_list : {
+ uk_tracepoints_start = .;
+ KEEP (*(.uk_tracepoints_list));
+ uk_tracepoints_end = .;
+ }
+}
+
+/* We do not want these section to be in the final image, they are
+ * needed only offline. Solution is obvious - ask the build system to
+ * strip them together with debug symbols.
+ *
+ * However, we need to put them at them somewhere close to the end of
+ * the elf, otherwise strip operation will make a hole in the address
+ * space. More then that, they have to reside _after_ the '_end'
+ * symbol.
+ *
+ * The trick is to allocate the sections after the '.comment'
+ * section. The other way would have been allocating a dummy section
+ * '.cut_here', but linker drops it if there is nothing in it.
+ */
+INSERT AFTER .comment;
diff --git a/lib/ukdebug/include/uk/trace.h b/lib/ukdebug/include/uk/trace.h
index 3e17b30e..34f0ed61 100644
--- a/lib/ukdebug/include/uk/trace.h
+++ b/lib/ukdebug/include/uk/trace.h
@@ -34,6 +34,16 @@
#ifndef _UK_TRACE_H_
#define _UK_TRACE_H_
+#include <uk/essentials.h>
+#include <stdint.h>
+
+#define UK_TP_DEF_MAGIC 0x65645054 /* TPde */
+
+enum __uk_trace_arg_type {
+ __UK_TRACE_ARG_INT = 0,
+ __UK_TRACE_ARG_STRING = 1,
+};
+
/* TODO: consider to move UK_CONCAT into public headers */
#define __UK_CONCAT_X(a, b) a##b
#define UK_CONCAT(a, b) __UK_CONCAT_X(a, b)
@@ -41,6 +51,13 @@
#define __UK_NARGS_X(a, b, c, d, e, f, g, h, n, ...) n
#define UK_NARGS(...) __UK_NARGS_X(, ##__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
+#define __UK_TRACE_GET_TYPE(arg) ( \
+ __builtin_types_compatible_p(typeof(arg), const char *) * \
+ __UK_TRACE_ARG_STRING + \
+ __builtin_types_compatible_p(typeof(arg), char *) * \
+ __UK_TRACE_ARG_STRING + \
+ 0)
+
#define __UK_GET_ARG1(a1, ...) a1
#define __UK_GET_ARG2(a1, a2, ...) a2
#define __UK_GET_ARG3(a1, a2, a3, ...) a3
@@ -73,4 +90,75 @@
#define UK_FOREACH(n, f, ...) \
UK_CONCAT(UK_FOREACH, n)(f, __VA_ARGS__)
+
+#define UK_FOREACH_SIZEOF(a, b) sizeof(b)
+#define __UK_TRACE_ARG_SIZES(n, ...) \
+ { UK_FOREACH(n, UK_FOREACH_SIZEOF, __VA_ARGS__) }
+
+#define __UK_TRACE_GET_TYPE_FOREACH(n, arg) \
+ __UK_TRACE_GET_TYPE(arg)
+#define __UK_TRACE_ARG_TYPES(n, ...) \
+ { UK_FOREACH(n, __UK_TRACE_GET_TYPE_FOREACH, __VA_ARGS__) }
+
+#define __UK_TRACE_REG(NR, regname, trace_name, fmt, ...) \
+ UK_CTASSERT(sizeof(#trace_name) < 255); \
+ UK_CTASSERT(sizeof(fmt) < 255); \
+ __attribute((__section__(".uk_tracepoints_list"))) \
+ static struct { \
+ uint32_t magic; \
+ uint32_t size; \
+ uint64_t cookie; \
+ uint8_t args_nr; \
+ uint8_t name_len; \
+ uint8_t format_len; \
+ uint8_t sizes[NR]; \
+ uint8_t types[NR]; \
+ char name[sizeof(#trace_name)]; \
+ char format[sizeof(fmt)]; \
+ } regname __used = { \
+ UK_TP_DEF_MAGIC, \
+ sizeof(regname), \
+ (uint64_t) ®name, \
+ NR, \
+ sizeof(#trace_name), sizeof(fmt), \
+ __UK_TRACE_ARG_SIZES(NR, __VA_ARGS__), \
+ __UK_TRACE_ARG_TYPES(NR, __VA_ARGS__), \
+ #trace_name, fmt }
+
+/* Makes from "const char*" "const char* arg1".
+ */
+#define __UK_ARGS_MAP_FN(n, t) t UK_CONCAT(arg, n)
+#define __UK_TRACE_ARGS_MAP(n, ...) \
+ UK_FOREACH(n, __UK_ARGS_MAP_FN, __VA_ARGS__)
+
+#define __UK_ARGS_MAP_FN_UNUSED(n, t) t UK_CONCAT(arg, n) __unused
+#define __UK_TRACE_ARGS_MAP_UNUSED(n, ...) \
+ UK_FOREACH(n, __UK_ARGS_MAP_FN_UNUSED, __VA_ARGS__)
+
+
+#if (defined(CONFIG_LIBUKDEBUG_TRACEPOINTS) && \
+ (defined(UK_DEBUG_TRACE) || defined(CONFIG_LIBUKDEBUG_ALL_TRACEPOINTS)))
+#define ____UK_TRACEPOINT(n, regdata_name, trace_name, fmt, ...) \
+ __UK_TRACE_REG(n, regdata_name, trace_name, fmt, \
+ __VA_ARGS__); \
+ static inline void trace_name(__UK_TRACE_ARGS_MAP_UNUSED(n,
__VA_ARGS__)) \
+ { \
+ }
+#else
+#define ____UK_TRACEPOINT(n, regdata_name, trace_name, fmt, ...) \
+ static inline void trace_name( \
+ __UK_TRACE_ARGS_MAP_UNUSED(n, __VA_ARGS__)) \
+ { \
+ }
+#endif
+
+#define __UK_TRACEPOINT(n, regdata_name, trace_name, fmt, ...) \
+ ____UK_TRACEPOINT(n, regdata_name, trace_name, fmt, \
+ __VA_ARGS__)
+#define UK_TRACEPOINT(trace_name, fmt, ...) \
+ __UK_TRACEPOINT(UK_NARGS(__VA_ARGS__), \
+ __ ## trace_name ## _regdata, \
+ trace_name, fmt, __VA_ARGS__)
+
+
#endif /* _UK_TRACE_H_ */
--
2.19.2
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