115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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#include <string.h>
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#include "trace/beauty/beauty.h"
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#include "util/evsel_fprintf.h"
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#include <linux/perf_event.h>
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#ifndef PERF_FLAG_FD_NO_GROUP
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# define PERF_FLAG_FD_NO_GROUP (1UL << 0)
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#endif
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#ifndef PERF_FLAG_FD_OUTPUT
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# define PERF_FLAG_FD_OUTPUT (1UL << 1)
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#endif
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#ifndef PERF_FLAG_PID_CGROUP
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# define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */
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#endif
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#ifndef PERF_FLAG_FD_CLOEXEC
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# define PERF_FLAG_FD_CLOEXEC (1UL << 3) /* O_CLOEXEC */
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#endif
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size_t syscall_arg__scnprintf_perf_flags(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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bool show_prefix = arg->show_string_prefix;
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const char *prefix = "PERF_";
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int printed = 0, flags = arg->val;
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if (flags == 0)
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return 0;
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#define P_FLAG(n) \
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if (flags & PERF_FLAG_##n) { \
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printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
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flags &= ~PERF_FLAG_##n; \
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}
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P_FLAG(FD_NO_GROUP);
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P_FLAG(FD_OUTPUT);
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P_FLAG(PID_CGROUP);
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P_FLAG(FD_CLOEXEC);
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#undef P_FLAG
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if (flags)
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printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
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return printed;
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}
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struct attr_fprintf_args {
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size_t size, printed;
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char *bf;
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bool first;
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};
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static int attr__fprintf(FILE *fp __maybe_unused, const char *name, const char *val, void *priv)
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{
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struct attr_fprintf_args *args = priv;
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size_t printed = scnprintf(args->bf + args->printed , args->size - args->printed, "%s%s: %s", args->first ? "" : ", ", name, val);
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args->first = false;
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args->printed += printed;
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return printed;
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}
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static size_t perf_event_attr___scnprintf(struct perf_event_attr *attr, char *bf, size_t size, bool show_zeros __maybe_unused)
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{
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struct attr_fprintf_args args = {
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.printed = scnprintf(bf, size, "{ "),
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.size = size,
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.first = true,
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.bf = bf,
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};
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perf_event_attr__fprintf(stdout, attr, attr__fprintf, &args);
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return args.printed + scnprintf(bf + args.printed, size - args.printed, " }");
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}
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static size_t syscall_arg__scnprintf_augmented_perf_event_attr(struct syscall_arg *arg, char *bf, size_t size)
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{
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struct perf_event_attr *attr = (void *)arg->augmented.args->value;
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struct perf_event_attr local_attr;
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/*
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* augmented_raw_syscalls.bpf.c (shipped with perf) copies
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* PERF_ATTR_SIZE_VER0 bytes when the tracee passes size=0,
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* but leaves the size field as 0. The payload size is
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* guaranteed by perf's own BPF program, not externally
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* controllable. Copy to a local so we can fix up size
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* without writing to the potentially read-only augmented
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* args buffer.
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*/
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if (!attr->size) {
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memcpy(&local_attr, attr, PERF_ATTR_SIZE_VER0);
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memset((void *)&local_attr + PERF_ATTR_SIZE_VER0, 0,
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sizeof(local_attr) - PERF_ATTR_SIZE_VER0);
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local_attr.size = PERF_ATTR_SIZE_VER0;
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attr = &local_attr;
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}
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return perf_event_attr___scnprintf(attr, bf, size,
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trace__show_zeros(arg->trace));
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}
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size_t syscall_arg__scnprintf_perf_event_attr(char *bf, size_t size, struct syscall_arg *arg)
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{
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if (arg->augmented.args)
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return syscall_arg__scnprintf_augmented_perf_event_attr(arg, bf, size);
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return scnprintf(bf, size, "%#lx", arg->val);
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}
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