X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=probes%2Flttng-probe-syscalls.c;h=8ce73dfa25b0c2c86a5ff11602f7017997ac8d1c;hb=259b6cb38d19bbe9c039728459bc25acc0f6f8a0;hp=bb7217b46c8a01d148a1137e693c219d73495c54;hpb=e6a17f26e9b344e9d2349a81f9dcee09e96593d6;p=lttng-modules.git diff --git a/probes/lttng-probe-syscalls.c b/probes/lttng-probe-syscalls.c index bb7217b4..8ce73dfa 100644 --- a/probes/lttng-probe-syscalls.c +++ b/probes/lttng-probe-syscalls.c @@ -1,9 +1,9 @@ /* - * probes/lttng-probe-sched.c + * probes/lttng-probe-syscalls.c * * Copyright 2010 (c) - Mathieu Desnoyers * - * LTTng sched probes. + * LTTng syscalls probes. * * Dual LGPL v2.1/GPL v2 license. */ @@ -11,8 +11,6 @@ #include #include "../ltt-events.h" -#ifndef SYSCALL_DETAIL - /* * Create the tracepoint static inlines from the kernel to validate that our * trace event macros match the kernel we run on. @@ -28,279 +26,6 @@ #include "../instrumentation/events/lttng-module/syscalls.h" -#else /* SYSCALL_DETAIL */ - -#include -#include -#include - -static void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); -static int lttng_syscalls_register_probe(struct lttng_probe_desc *desc); -static void lttng_syscalls_unregister_probe(struct lttng_probe_desc *desc); - -static struct lttng_probe_desc *syscall_probe_desc; - -/* - * Create LTTng tracepoint probes. - */ -#define LTTNG_PACKAGE_BUILD -#define CREATE_TRACE_POINTS - -/* Hijack probe callback for system calls */ -#define TP_PROBE_CB(_template) &syscall_entry_probe -#define TP_REGISTER_OVERRIDE lttng_syscalls_register_probe -#define TP_UNREGISTER_OVERRIDE lttng_syscalls_unregister_probe - -#define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers - -#include "../instrumentation/syscalls/headers/syscalls.h" - -#undef TP_UNREGISTER_OVERRIDE -#undef TP_REGISTER_OVERRIDE -#undef TP_PROBE_CB -#undef LTTNG_PACKAGE_BUILD -#undef CREATE_TRACE_POINTS - -struct trace_syscall_entry { - void *func; - const struct lttng_event_desc *desc; /* Set dynamically */ - const struct lttng_event_field *fields; - unsigned int nrargs; -}; - -static int sc_table_desc_filled; - -#define CREATE_SYSCALL_TABLE - -#undef TRACE_SYSCALL_TABLE -#define TRACE_SYSCALL_TABLE(_name, _nr, _nrargs) \ - [ _nr ] = { \ - .func = __event_probe__##_name, \ - .nrargs = (_nrargs), \ - .fields = __event_fields___##_name, \ - }, - -static struct trace_syscall_entry sc_table[] = { -#include "../instrumentation/syscalls/headers/syscalls.h" -}; - -#undef CREATE_SYSCALL_TABLE - -static void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) -{ - struct trace_syscall_entry *entry; - struct ltt_channel *chan = __data; - struct ltt_event *event; - - if (unlikely(id >= ARRAY_SIZE(sc_table))) - return; - entry = &sc_table[id]; - if (unlikely(!entry->func)) - return; - event = chan->sc_table[id]; - WARN_ON_ONCE(!event); - - switch (entry->nrargs) { - case 0: - { - void (*fptr)(void *__data) = entry->func; - - fptr(event); - break; - } - case 1: - { - void (*fptr)(void *__data, unsigned long arg0) = entry->func; - unsigned long args[1]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0]); - break; - } - case 2: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1) = entry->func; - unsigned long args[2]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0], args[1]); - break; - } - case 3: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2) = entry->func; - unsigned long args[3]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0], args[1], args[2]); - break; - } - case 4: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2, - unsigned long arg3) = entry->func; - unsigned long args[4]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0], args[1], args[2], args[3]); - break; - } - case 5: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2, - unsigned long arg3, - unsigned long arg4) = entry->func; - unsigned long args[5]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0], args[1], args[2], args[3], args[4]); - break; - } - case 6: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2, - unsigned long arg3, - unsigned long arg4, - unsigned long arg5) = entry->func; - unsigned long args[6]; - - syscall_get_arguments(current, regs, 0, entry->nrargs, args); - fptr(event, args[0], args[1], args[2], - args[3], args[4], args[5]); - break; - } - default: - break; - } -} - -static const struct lttng_event_desc *find_syscall_desc(unsigned int id) -{ - unsigned int i; - - for (i = 0; i < syscall_probe_desc->nr_events; i++) { - if (syscall_probe_desc->event_desc[i].fields - == sc_table[id].fields) - return &syscall_probe_desc->event_desc[i]; - } - WARN_ON_ONCE(1); - return NULL; -} - -static void fill_sc_table_desc(void) -{ - unsigned int i; - - if (sc_table_desc_filled) - return; - /* - * This is O(n^2), but rare. Eventually get the TRACE_EVENT code - * to emit per-event symbols to skip this. - */ - for (i = 0; i < ARRAY_SIZE(sc_table); i++) { - const struct lttng_event_desc **desc = &sc_table[i].desc; - - if (!sc_table[i].func) - continue; - (*desc) = find_syscall_desc(i); - } - sc_table_desc_filled = 1; -} - - -int lttng_syscalls_register(struct ltt_channel *chan, void *filter) -{ - unsigned int i; - int ret; - - fill_sc_table_desc(); - - if (!chan->sc_table) { - /* create syscall table mapping syscall to events */ - chan->sc_table = kzalloc(sizeof(struct ltt_event *) - * ARRAY_SIZE(sc_table), GFP_KERNEL); - if (!chan->sc_table) - return -ENOMEM; - } - - /* Allocate events for each syscall, insert into table */ - for (i = 0; i < ARRAY_SIZE(sc_table); i++) { - struct lttng_kernel_event ev; - const struct lttng_event_desc *desc = sc_table[i].desc; - - /* - * Skip those already populated by previous failed - * register for this channel. - */ - if (chan->sc_table[i]) - continue; - memset(&ev, 0, sizeof(ev)); - strncpy(ev.name, desc->name, LTTNG_SYM_NAME_LEN); - ev.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; - ev.instrumentation = LTTNG_KERNEL_NOOP; - chan->sc_table[i] = ltt_event_create(chan, &ev, filter); - if (!chan->sc_table[i]) { - /* - * If something goes wrong in event registration - * after the first one, we have no choice but to - * leave the previous events in there, until - * deleted by session teardown. - */ - return -EINVAL; - } - } - ret = tracepoint_probe_register("syscall_entry", - (void *) syscall_entry_probe, chan); - return ret; -} - -/* - * Only called at session destruction. - */ -int lttng_syscalls_unregister(struct ltt_channel *chan) -{ - int ret; - - if (!chan->sc_table) - return 0; - ret = tracepoint_probe_unregister("syscall_entry", - (void *) syscall_entry_probe, chan); - if (ret) - return ret; - /* ltt_event destroy will be performed by ltt_session_destroy() */ - kfree(chan->sc_table); - return 0; -} - -static int lttng_syscalls_register_probe(struct lttng_probe_desc *desc) -{ - WARN_ON_ONCE(syscall_probe_desc); - syscall_probe_desc = desc; - return 0; -} - -static void lttng_syscalls_unregister_probe(struct lttng_probe_desc *desc) -{ - WARN_ON_ONCE(!syscall_probe_desc); - syscall_probe_desc = NULL; -} - -#endif /* SYSCALL_DETAIL */ - MODULE_LICENSE("GPL and additional rights"); MODULE_AUTHOR("Mathieu Desnoyers "); -MODULE_DESCRIPTION("LTTng sched probes"); +MODULE_DESCRIPTION("LTTng generic syscall probes");