X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Fust%2Fmarker.h;h=7e935c1720d5e7a101982a1041b9b05c2170b470;hb=e77b8e8e6202b3a5ff87dc20553d2fad9ed5ff2e;hp=577b2fb4985cfcaaab23f75ff937085cf734cf56;hpb=9389f19df977153396835ea4ca766f72548ecc74;p=ust.git diff --git a/include/ust/marker.h b/include/ust/marker.h index 577b2fb..7e935c1 100644 --- a/include/ust/marker.h +++ b/include/ust/marker.h @@ -86,15 +86,20 @@ struct marker { #define CONFIG_MARKERS #ifdef CONFIG_MARKERS -#define _DEFINE_MARKER(channel, name, tp_name_str, tp_cb, format, unique) \ +#define _DEFINE_MARKER(channel, name, tp_name_str, tp_cb, format, unique, m) \ struct registers regs; \ - /* make asm label visible to C */ \ - extern struct marker make_mark_struct_name(channel, name, unique); \ \ /* This next asm has to be a basic inline asm (no input/output/clobber), \ - because it must not require %-sign escaping, as we most certainly \ - have some %-signs in the format string. */ \ + * because it must not require %-sign escaping, as we most certainly \ + * have some %-signs in the format string. \ + */ \ asm volatile ( \ + /* We only define these symbols if they have not yet been defined. Indeed, \ + * if two markers with the same channel/name are on the same line, they \ + * will try to create the same symbols, resulting in a conflict. This \ + * is not unusual as it can be the result of function inlining. \ + */ \ + ".ifndef __mstrtab_" XSTR(channel) "_" XSTR(name) "_channel_" XSTR(unique) "\n\t" \ ".section __markers_strings,\"aw\",@progbits\n\t" \ "__mstrtab_" XSTR(channel) "_" XSTR(name) "_channel_" XSTR(unique) ":\n\t" \ ".string \"" XSTR(channel) "\"\n\t" \ @@ -103,11 +108,12 @@ struct marker { "__mstrtab_" XSTR(channel) "_" XSTR(name) "_format_" XSTR(unique) ":\n\t" \ ".string " "\"" format "\"" "\n\t" \ ".previous\n\t" \ + ".endif\n\t" \ + ); \ + asm volatile ( \ ".section __markers,\"aw\",@progbits\n\t" \ ".align 8\n\t" \ - XSTR(make_mark_struct_name(channel, name, unique)) ":\n\t" \ - ".global " XSTR(make_mark_struct_name(channel, name, unique)) "\n\t" \ - ".local " XSTR(make_mark_struct_name(channel, name, unique)) "\n\t" \ + "2:\n\t" \ _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_channel_" XSTR(unique) ")\n\t" /* channel string */ \ _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_name_" XSTR(unique) ")\n\t" /* name string */ \ _ASM_PTR "(__mstrtab_" XSTR(channel) "_" XSTR(name) "_format_" XSTR(unique) ")\n\t" /* format string */ \ @@ -122,20 +128,20 @@ struct marker { _ASM_PTR "0\n\t" /* marker_probe_closure *multi */ \ _ASM_PTR "0\n\t" /* tp_name */ \ _ASM_PTR "0\n\t" /* tp_cb */ \ - "__mark_location_" XSTR(unique) ":\n\t" \ _ASM_PTR "(1f)\n\t" /* location */ \ ".previous\n\t" \ "1:\n\t" \ - ); \ + ARCH_COPY_ADDR("2b", "%[outptr]") "\n\t" \ + : [outptr] "=r" (m) ); \ \ save_registers(®s) -#define DEFINE_MARKER(channel, name, format, unique) \ - _DEFINE_MARKER(channel, name, NULL, NULL, format, unique) +#define DEFINE_MARKER(channel, name, format, unique, m) \ + _DEFINE_MARKER(channel, name, NULL, NULL, format, unique, m) -#define DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format, unique) \ - _DEFINE_MARKER(channel, name, #tp_name, tp_cb, format, unique) +#define DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format, unique, m) \ + _DEFINE_MARKER(channel, name, #tp_name, tp_cb, format, unique, m) /* * Make sure the alignment of the structure in the __markers section will @@ -147,31 +153,20 @@ struct marker { * If generic is false, immediate values are used. */ -#define make_mark_struct_name(channel, name, unique) \ - make_mark_struct_name2(channel, name, unique) - -#define make_mark_struct_name2(channel, name, unique) \ - __mark_struct_##channel##_##name##_##unique - #define __trace_mark(generic, channel, name, call_private, format, args...) \ __trace_mark_counter(generic, channel, name, __LINE__, call_private, format, ## args) #define __trace_mark_counter(generic, channel, name, unique, call_private, format, args...) \ do { \ - DEFINE_MARKER(channel, name, format, unique); \ + struct marker *m; \ + DEFINE_MARKER(channel, name, format, unique, m); \ __mark_check_format(format, ## args); \ if (!generic) { \ - if (unlikely(imv_read( \ - make_mark_struct_name(channel, name, unique).state))) \ - (make_mark_struct_name(channel, name, unique).call) \ - (&make_mark_struct_name(channel, name, unique), \ - call_private, ®s, ## args); \ + if (unlikely(imv_read(m->state))) \ + (m->call)(m, call_private, ®s, ## args); \ } else { \ - if (unlikely(_imv_read( \ - make_mark_struct_name(channel, name, unique).state))) \ - (make_mark_struct_name(channel, name, unique).call) \ - (&make_mark_struct_name(channel, name, unique), \ - call_private, ®s, ## args); \ + if (unlikely(_imv_read(m->state))) \ + (m->call)(m, call_private, ®s, ## args); \ } \ } while (0) @@ -180,11 +175,12 @@ struct marker { #define __trace_mark_tp_counter(channel, name, unique, call_private, tp_name, tp_cb, format, args...) \ do { \ + struct marker m; \ void __check_tp_type(void) \ { \ register_trace_##tp_name(tp_cb); \ } \ - DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format, unique);\ + DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format, unique, m);\ __mark_check_format(format, ## args); \ (*__mark_##channel##_##name.call)(&__mark_##channel##_##name, \ call_private, ®s, ## args); \ @@ -196,7 +192,7 @@ extern void marker_update_probe_range(struct marker *begin, #define GET_MARKER(channel, name) (__mark_##channel##_##name) #else /* !CONFIG_MARKERS */ -#define DEFINE_MARKER(channel, name, tp_name, tp_cb, format) +#define DEFINE_MARKER(channel, name, tp_name, tp_cb, format, m) #define __trace_mark(generic, channel, name, call_private, format, args...) \ __mark_check_format(format, ## args) #define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb, \ @@ -236,8 +232,7 @@ static inline void marker_update_probe_range(struct marker *begin, * * Places a marker using a standard memory read (_imv_read()) to be * enabled. Should be used for markers in code paths where instruction - * modification based enabling is not welcome. (__init and __exit functions, - * lockdep, some traps, printk). + * modification based enabling is not welcome. */ #define _trace_mark(channel, name, format, args...) \ __trace_mark(1, channel, name, NULL, format, ## args)