Detailed system call tracing (TRACE_EVENT() generation for integer support)

[lttng-modules.git] / instrumentation / syscalls / lttng-syscalls-extractor / lttng-syscalls-extractor.c

diff --git a/instrumentation/syscalls/lttng-syscalls-extractor/lttng-syscalls-extractor.c b/instrumentation/syscalls/lttng-syscalls-extractor/lttng-syscalls-extractor.c
new file mode 100644 (file)
index 0000000..2eb1cda
--- /dev/null
+++ b/instrumentation/syscalls/lttng-syscalls-extractor/lttng-syscalls-extractor.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
+ *
+ * Dump syscall metadata to console.
+ *
+ * GPLv2 license.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/kallsyms.h>
+#include <linux/dcache.h>
+#include <linux/ftrace_event.h>
+#include <trace/syscall.h>
+
+#ifndef CONFIG_FTRACE_SYSCALLS
+#error "You need to set CONFIG_FTRACE_SYSCALLS=y"
+#endif
+
+static struct syscall_metadata **__start_syscalls_metadata;
+static struct syscall_metadata **__stop_syscalls_metadata;
+
+static __init
+struct syscall_metadata *find_syscall_meta(unsigned long syscall)
+{
+       struct syscall_metadata **iter;
+
+       for (iter = __start_syscalls_metadata;
+                       iter < __stop_syscalls_metadata; iter++) {
+               if ((*iter)->syscall_nr == syscall)
+                       return (*iter);
+       }
+       return NULL;
+}
+
+int init_module(void)
+{
+       struct syscall_metadata *meta;
+       int i;
+
+       __start_syscalls_metadata = (void *) kallsyms_lookup_name("__start_syscalls_metadata");
+       __stop_syscalls_metadata = (void *) kallsyms_lookup_name("__stop_syscalls_metadata");
+
+       for (i = 0; i < NR_syscalls; i++) {
+               int j;
+
+               meta = find_syscall_meta(i);
+               if (!meta)
+                       continue;
+               printk("syscall %s nr %d nbargs %d ",
+                       meta->name, meta->syscall_nr, meta->nb_args);
+               printk("types: (");
+               for (j = 0; j < meta->nb_args; j++) {
+                       if (j > 0)
+                               printk(", ");
+                       printk("%s", meta->types[j]);
+               }
+               printk(") ");
+               printk("args: (");
+               for (j = 0; j < meta->nb_args; j++) {
+                       if (j > 0)
+                               printk(", ");
+                       printk("%s", meta->args[j]);
+               }
+               printk(")\n");
+       }
+       printk("SUCCESS\n");
+
+       return -1;
+}
+
+void cleanup_module(void)
+{
+}  
+
+MODULE_LICENSE("GPL");