#define TP_UINT_FIELD(bits) \
static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
- return *(u##bits *)(sample->raw_data + field->offset); \
+ u##bits value; \
+ memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
+ return value; \
}
TP_UINT_FIELD(8);
#define TP_UINT_FIELD__SWAPPED(bits) \
static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
- u##bits value = *(u##bits *)(sample->raw_data + field->offset); \
+ u##bits value; \
+ memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
return bswap_##bits(value);\
}
struct syscall {
struct event_format *tp_format;
+ int nr_args;
+ struct format_field *args;
const char *name;
bool filtered;
bool is_exit;
bool show_comm;
bool show_tool_stats;
bool trace_syscalls;
+ bool force;
int trace_pgfaults;
};
struct format_field *field;
int idx = 0;
- sc->arg_scnprintf = calloc(sc->tp_format->format.nr_fields - 1, sizeof(void *));
+ sc->arg_scnprintf = calloc(sc->nr_args, sizeof(void *));
if (sc->arg_scnprintf == NULL)
return -1;
if (sc->fmt)
sc->arg_parm = sc->fmt->arg_parm;
- for (field = sc->tp_format->format.fields->next; field; field = field->next) {
+ for (field = sc->args; field; field = field->next) {
if (sc->fmt && sc->fmt->arg_scnprintf[idx])
sc->arg_scnprintf[idx] = sc->fmt->arg_scnprintf[idx];
else if (field->flags & FIELD_IS_POINTER)
if (sc->tp_format == NULL)
return -1;
+ sc->args = sc->tp_format->format.fields;
+ sc->nr_args = sc->tp_format->format.nr_fields;
+ /* drop nr field - not relevant here; does not exist on older kernels */
+ if (sc->args && strcmp(sc->args->name, "nr") == 0) {
+ sc->args = sc->args->next;
+ --sc->nr_args;
+ }
+
sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
return syscall__set_arg_fmts(sc);
}
+/*
+ * args is to be interpreted as a series of longs but we need to handle
+ * 8-byte unaligned accesses. args points to raw_data within the event
+ * and raw_data is guaranteed to be 8-byte unaligned because it is
+ * preceded by raw_size which is a u32. So we need to copy args to a temp
+ * variable to read it. Most notably this avoids extended load instructions
+ * on unaligned addresses
+ */
+
static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
- unsigned long *args, struct trace *trace,
+ unsigned char *args, struct trace *trace,
struct thread *thread)
{
size_t printed = 0;
+ unsigned char *p;
+ unsigned long val;
- if (sc->tp_format != NULL) {
+ if (sc->args != NULL) {
struct format_field *field;
u8 bit = 1;
struct syscall_arg arg = {
.thread = thread,
};
- for (field = sc->tp_format->format.fields->next; field;
+ for (field = sc->args; field;
field = field->next, ++arg.idx, bit <<= 1) {
if (arg.mask & bit)
continue;
+
+ /* special care for unaligned accesses */
+ p = args + sizeof(unsigned long) * arg.idx;
+ memcpy(&val, p, sizeof(val));
+
/*
* Suppress this argument if its value is zero and
* and we don't have a string associated in an
* strarray for it.
*/
- if (args[arg.idx] == 0 &&
+ if (val == 0 &&
!(sc->arg_scnprintf &&
sc->arg_scnprintf[arg.idx] == SCA_STRARRAY &&
sc->arg_parm[arg.idx]))
printed += scnprintf(bf + printed, size - printed,
"%s%s: ", printed ? ", " : "", field->name);
if (sc->arg_scnprintf && sc->arg_scnprintf[arg.idx]) {
- arg.val = args[arg.idx];
+ arg.val = val;
if (sc->arg_parm)
arg.parm = sc->arg_parm[arg.idx];
printed += sc->arg_scnprintf[arg.idx](bf + printed,
size - printed, &arg);
} else {
printed += scnprintf(bf + printed, size - printed,
- "%ld", args[arg.idx]);
+ "%ld", val);
}
}
} else {
int i = 0;
while (i < 6) {
+ /* special care for unaligned accesses */
+ p = args + sizeof(unsigned long) * i;
+ memcpy(&val, p, sizeof(val));
printed += scnprintf(bf + printed, size - printed,
"%sarg%d: %ld",
- printed ? ", " : "", i, args[i]);
+ printed ? ", " : "", i, val);
++i;
}
}
return -1;
}
- printed += trace__printf_interrupted_entry(trace, sample);
+ if (!trace->summary_only)
+ trace__printf_interrupted_entry(trace, sample);
ttrace->entry_time = sample->time;
msg = ttrace->entry_str;
} else
ttrace->entry_pending = true;
- trace->current = thread;
+ if (trace->current != thread) {
+ thread__put(trace->current);
+ trace->current = thread__get(thread);
+ }
return 0;
}
if (err < 0)
goto out_error_mmap;
+ if (!target__none(&trace->opts.target))
+ perf_evlist__enable(evlist);
+
if (forks)
perf_evlist__start_workload(evlist);
- else
- perf_evlist__enable(evlist);
trace->multiple_threads = evlist->threads->map[0] == -1 ||
evlist->threads->nr > 1 ||
if (interrupted)
goto out_disable;
+
+ if (done && !draining) {
+ perf_evlist__disable(evlist);
+ draining = true;
+ }
}
}
}
out_disable:
+ thread__zput(trace->current);
+
perf_evlist__disable(evlist);
if (!err) {
struct perf_data_file file = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
+ .force = trace->force,
};
struct perf_session *session;
struct perf_evsel *evsel;
setup_pager();
- err = perf_session__process_events(session, &trace->tool);
+ err = perf_session__process_events(session);
if (err)
pr_err("Failed to process events, error %d", err);
int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
{
- const char * const trace_usage[] = {
+ const char *trace_usage[] = {
"perf trace [<options>] [<command>]",
"perf trace [<options>] -- <command> [<options>]",
"perf trace record [<options>] [<command>]",
OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
"Trace pagefaults", parse_pagefaults, "maj"),
OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
+ OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
OPT_END()
};
+ const char * const trace_subcommands[] = { "record", NULL };
int err;
char bf[BUFSIZ];
goto out;
}
- argc = parse_options(argc, argv, trace_options, trace_usage,
- PARSE_OPT_STOP_AT_NON_OPTION);
+ argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
+ trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
if (trace.trace_pgfaults) {
trace.opts.sample_address = true;
projects / firefly-linux-kernel-4.4.55.git / blobdiff