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syscall listing: show syscall ID
[lttng-modules.git] / lttng-syscalls.c
diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 1840caf57d6de50270e3bbac3e9d414c1b372410..0a8074f805ea2efd8e826be92c5d9fee3eac3534 100644 (file)
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -27,6 +27,7 @@
 #include <linux/bitmap.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <linux/seq_file.h>
 #include <asm/ptrace.h>
 #include <asm/syscall.h>
 
@@ -72,13 +73,6 @@ struct mmap_arg_struct;
 #define NR_compat_syscalls NR_syscalls
 #endif
 
-/*
- * Take care of NOARGS not supported by mainline.
- */
-#define DECLARE_EVENT_CLASS_NOARGS(name, tstruct, assign, print)
-#define DEFINE_EVENT_NOARGS(template, name)
-#define TRACE_EVENT_NOARGS(name, struct, assign, print)
-
 /*
  * Create LTTng tracepoint probes.
  */
@@ -108,18 +102,18 @@ struct mmap_arg_struct;
 /* Hijack probe callback for system call enter */
 #undef TP_PROBE_CB
 #define TP_PROBE_CB(_template)         &syscall_entry_probe
-#define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk)        \
-       TRACE_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
-       LTTNG_TRACE_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\
-               PARAMS(_locvar), PARAMS(_code),\
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CODE(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
+               PARAMS(_locvar), PARAMS(_code),                                 \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk)        \
-       DECLARE_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign),\
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign), \
                PARAMS(_printk))
-#define SC_DEFINE_EVENT_NOARGS(_template, _name)                       \
-       DEFINE_EVENT_NOARGS(syscall_enter_##_template, syscall_enter_##_name)
+#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name)            \
+       LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_enter_##_template, syscall_enter_##_name)
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM syscall_enter_integers
 #define TRACE_INCLUDE_FILE syscalls_integers
@@ -131,30 +125,29 @@ struct mmap_arg_struct;
 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
 #undef TRACE_INCLUDE_FILE
 #undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACE_EVENT
-#undef SC_TRACE_EVENT
-#undef SC_DECLARE_EVENT_CLASS_NOARGS
-#undef SC_DEFINE_EVENT_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
+#undef SC_LTTNG_TRACEPOINT_EVENT
+#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
 #undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_integers_H
-#undef _TRACE_SYSCALLS_pointers_H
-
+#undef _TRACE_SYSCALLS_INTEGERS_H
+#undef _TRACE_SYSCALLS_POINTERS_H
 
 /* Hijack probe callback for compat system call enter */
 #define TP_PROBE_CB(_template)         &syscall_entry_probe
-#define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk)        \
-       TRACE_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
-               PARAMS(_struct), PARAMS(_assign),                       \
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
+               PARAMS(_struct), PARAMS(_assign),                               \
                PARAMS(_printk))
-#define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
-       LTTNG_TRACE_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\
-               PARAMS(_locvar), PARAMS(_code),\
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
+               PARAMS(_locvar), PARAMS(_code),                                 \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
-       DECLARE_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \
                PARAMS(_assign), PARAMS(_printk))
-#define SC_DEFINE_EVENT_NOARGS(_template, _name)                       \
-       DEFINE_EVENT_NOARGS(compat_syscall_enter_##_template,           \
+#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name)            \
+       LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_enter_##_template, \
                compat_syscall_enter_##_name)
 #define TRACE_SYSTEM compat_syscall_enter_integers
 #define TRACE_INCLUDE_FILE compat_syscalls_integers
@@ -166,13 +159,13 @@ struct mmap_arg_struct;
 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
 #undef TRACE_INCLUDE_FILE
 #undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACE_EVENT
-#undef SC_TRACE_EVENT
-#undef SC_DECLARE_EVENT_CLASS_NOARGS
-#undef SC_DEFINE_EVENT_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
+#undef SC_LTTNG_TRACEPOINT_EVENT
+#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
 #undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_integers_H
-#undef _TRACE_SYSCALLS_pointers_H
+#undef _TRACE_SYSCALLS_INTEGERS_H
+#undef _TRACE_SYSCALLS_POINTERS_H
 
 #undef SC_ENTER
 
@@ -189,18 +182,18 @@ struct mmap_arg_struct;
 
 /* Hijack probe callback for system call exit */
 #define TP_PROBE_CB(_template)         &syscall_exit_probe
-#define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk)        \
-       TRACE_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
-       LTTNG_TRACE_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\
-               PARAMS(_locvar), PARAMS(_code),\
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
+               PARAMS(_locvar), PARAMS(_code),                                 \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
-       DECLARE_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \
                PARAMS(_assign), PARAMS(_printk))
-#define SC_DEFINE_EVENT_NOARGS(_template, _name)                       \
-       DEFINE_EVENT_NOARGS(syscall_exit_##_template,                   \
+#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name)            \
+       LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template,        \
                syscall_exit_##_name)
 #define TRACE_SYSTEM syscall_exit_integers
 #define TRACE_INCLUDE_FILE syscalls_integers
@@ -212,29 +205,29 @@ struct mmap_arg_struct;
 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
 #undef TRACE_INCLUDE_FILE
 #undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACE_EVENT
-#undef SC_TRACE_EVENT
-#undef SC_DECLARE_EVENT_CLASS_NOARGS
-#undef SC_DEFINE_EVENT_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
+#undef SC_LTTNG_TRACEPOINT_EVENT
+#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
 #undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_integers_H
-#undef _TRACE_SYSCALLS_pointers_H
+#undef _TRACE_SYSCALLS_INTEGERS_H
+#undef _TRACE_SYSCALLS_POINTERS_H
 
 
 /* Hijack probe callback for compat system call exit */
 #define TP_PROBE_CB(_template)         &syscall_exit_probe
-#define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk)        \
-       TRACE_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
-       LTTNG_TRACE_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\
-               PARAMS(_locvar), PARAMS(_code),\
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
+               PARAMS(_locvar), PARAMS(_code),                                 \
                PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
-       DECLARE_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
+       LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \
                PARAMS(_assign), PARAMS(_printk))
-#define SC_DEFINE_EVENT_NOARGS(_template, _name)                       \
-       DEFINE_EVENT_NOARGS(compat_syscall_exit_##_template,            \
+#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name)            \
+       LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
                compat_syscall_exit_##_name)
 #define TRACE_SYSTEM compat_syscall_exit_integers
 #define TRACE_INCLUDE_FILE compat_syscalls_integers
@@ -246,13 +239,13 @@ struct mmap_arg_struct;
 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
 #undef TRACE_INCLUDE_FILE
 #undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACE_EVENT
-#undef SC_TRACE_EVENT
-#undef SC_DECLARE_EVENT_CLASS_NOARGS
-#undef SC_DEFINE_EVENT_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
+#undef SC_LTTNG_TRACEPOINT_EVENT
+#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
+#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
 #undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_integers_H
-#undef _TRACE_SYSCALLS_pointers_H
+#undef _TRACE_SYSCALLS_INTEGERS_H
+#undef _TRACE_SYSCALLS_POINTERS_H
 
 #undef SC_EXIT
 
@@ -1041,6 +1034,12 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
                filter = chan->sc_filter;
        }
 
+       if (!name) {
+               /* Disable all system calls */
+               bitmap_clear(filter->sc, 0, NR_syscalls);
+               bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
+               goto apply_filter;
+       }
        syscall_nr = get_syscall_nr(name);
        compat_syscall_nr = get_compat_syscall_nr(name);
        if (syscall_nr < 0 && compat_syscall_nr < 0) {
@@ -1061,6 +1060,7 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
                }
                bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1);
        }
+apply_filter:
        if (!chan->sc_filter)
                rcu_assign_pointer(chan->sc_filter, filter);
        chan->syscall_all = 0;
@@ -1071,3 +1071,87 @@ error:
                kfree(filter);
        return ret;
 }
+
+static
+const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
+{
+       const struct trace_syscall_entry *entry;
+       int iter = 0;
+
+       for (entry = sc_table;
+                       entry < sc_table + ARRAY_SIZE(sc_table);
+                        entry++) {
+               if (iter++ >= *pos)
+                       return entry;
+       }
+       for (entry = compat_sc_table;
+                       entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
+                        entry++) {
+               if (iter++ >= *pos)
+                       return entry;
+       }
+       /* End of list */
+       return NULL;
+}
+
+static
+void *syscall_list_start(struct seq_file *m, loff_t *pos)
+{
+       return (void *) syscall_list_get_entry(pos);
+}
+
+static
+void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+       (*ppos)++;
+       return (void *) syscall_list_get_entry(ppos);
+}
+
+static
+void syscall_list_stop(struct seq_file *m, void *p)
+{
+}
+
+static
+int syscall_list_show(struct seq_file *m, void *p)
+{
+       const struct trace_syscall_entry *table, *entry = p;
+       unsigned int bitness;
+
+       if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
+               bitness = BITS_PER_LONG;
+               table = sc_table;
+       } else {
+               bitness = 32;
+               table = compat_sc_table;
+               WARN_ON_ONCE(!(entry >= compat_sc_table
+                       && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table)));
+       }
+       seq_printf(m,   "syscall { id = %u; name = %s; bitness = %u; };\n",
+               entry - table,
+               entry->desc->name,
+               bitness);
+       return 0;
+}
+
+static
+const struct seq_operations lttng_syscall_list_seq_ops = {
+       .start = syscall_list_start,
+       .next = syscall_list_next,
+       .stop = syscall_list_stop,
+       .show = syscall_list_show,
+};
+
+static
+int lttng_syscall_list_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &lttng_syscall_list_seq_ops);
+}
+
+const struct file_operations lttng_syscall_list_fops = {
+       .owner = THIS_MODULE,
+       .open = lttng_syscall_list_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = seq_release,
+};
LTTng 2.0/0.x modules
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