+/*
+ * Copyright (c) 2013 Ben Noordhuis <info@bnoordhuis.nl>
+ * Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
+ * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
#include "defs.h"
-#ifdef HAVE_LINUX_PERF_EVENT_H
-# include <linux/perf_event.h>
-#endif
+#include "perf_event_struct.h"
+#include "xlat/clocknames.h"
+#include "xlat/hw_breakpoint_len.h"
+#include "xlat/hw_breakpoint_type.h"
+#include "xlat/perf_attr_size.h"
+#include "xlat/perf_branch_sample_type.h"
#include "xlat/perf_event_open_flags.h"
+#include "xlat/perf_event_read_format.h"
+#include "xlat/perf_event_sample_format.h"
+#include "xlat/perf_hw_cache_id.h"
+#include "xlat/perf_hw_cache_op_id.h"
+#include "xlat/perf_hw_cache_op_result_id.h"
+#include "xlat/perf_hw_id.h"
+#include "xlat/perf_sw_ids.h"
+#include "xlat/perf_type_id.h"
+
+struct pea_desc {
+ struct perf_event_attr *attr;
+ uint32_t size;
+};
+
+static void
+free_pea_desc(void *pea_desc_ptr)
+{
+ struct pea_desc *desc = pea_desc_ptr;
+
+ free(desc->attr);
+ free(desc);
+}
+
+static int
+fetch_perf_event_attr(struct tcb *tcp, unsigned long addr)
+{
+ struct pea_desc *desc;
+ struct perf_event_attr *attr;
+ uint32_t size;
+
+ if (umove(tcp, addr + offsetof(struct perf_event_attr, size), &size)) {
+ printaddr(addr);
+ return 1;
+ }
+
+ if (size > sizeof(*attr))
+ size = sizeof(*attr);
+
+ if (!size)
+ size = PERF_ATTR_SIZE_VER0;
+
+ /*
+ * Kernel (rightfully) deems invalid attribute structures with size less
+ * than first published format size, and we do the same.
+ */
+ if (size < PERF_ATTR_SIZE_VER0) {
+ printaddr(addr);
+ return 1;
+ }
+
+ if (abbrev(tcp))
+ size = offsetofend(struct perf_event_attr, config);
+
+ /* Size should be multiple of 8, but kernel doesn't check for it */
+ /* size &= ~7; */
+
+ attr = xcalloc(1, sizeof(*attr));
+
+ if (umoven_or_printaddr(tcp, addr, size, attr)) {
+ free(attr);
+
+ return 1;
+ }
+
+ desc = xmalloc(sizeof(*desc));
+
+ desc->attr = attr;
+ desc->size = size;
+
+ set_tcb_priv_data(tcp, desc, free_pea_desc);
+
+ return 0;
+}
+
+#define PRINT_XLAT(prefix, xlat, x, dflt) \
+ do { \
+ tprints(prefix); \
+ printxval_search(xlat, x, dflt); \
+ } while (0)
+
+static void
+print_perf_event_attr(struct tcb *tcp, unsigned long addr)
+{
+ static const char *precise_ip_desc[] = {
+ "arbitrary skid",
+ "constant skid",
+ "requested to have 0 skid",
+ "must have 0 skid",
+ };
+
+ struct pea_desc *desc;
+ struct perf_event_attr *attr;
+ uint32_t size;
+ uint32_t new_size;
+ int use_new_size = 0;
+
+ /*
+ * Amusingly, kernel accepts structures with only part of the field
+ * present, so we making check like this (instead of checking
+ * offsetofend against size) in order to print fields as kernel sees
+ * them. This also should work great on big endian architectures.
+ */
+ #define _PERF_CHECK_FIELD(_field) \
+ do { \
+ if (offsetof(struct perf_event_attr, _field) >= size) \
+ goto print_perf_event_attr_out; \
+ } while (0)
+
+ desc = get_tcb_priv_data(tcp);
+
+ attr = desc->attr;
+ size = desc->size;
+
+ /* The only error which expected to change size field currently */
+ if (tcp->u_error == E2BIG) {
+ if (umove(tcp, addr + offsetof(struct perf_event_attr, size),
+ &new_size))
+ use_new_size = -1;
+ else
+ use_new_size = 1;
+ }
+
+ PRINT_XLAT("{type=", perf_type_id, attr->type, "PERF_TYPE_???");
+ tprintf(", size=");
+ printxval(perf_attr_size, attr->size, "PERF_ATTR_SIZE_???");
+
+ if (use_new_size) {
+ tprints(" => ");
+
+ if (use_new_size > 0)
+ printxval(perf_attr_size, new_size,
+ "PERF_ATTR_SIZE_???");
+ else
+ tprints("???");
+ }
+
+ switch (attr->type) {
+ case PERF_TYPE_HARDWARE:
+ PRINT_XLAT(", config=", perf_hw_id, attr->config,
+ "PERF_COUNT_HW_???");
+ break;
+ case PERF_TYPE_SOFTWARE:
+ PRINT_XLAT(", config=", perf_sw_ids, attr->config,
+ "PERF_COUNT_SW_???");
+ break;
+ case PERF_TYPE_TRACEPOINT:
+ /*
+ * "The value to use in config can be obtained from under
+ * debugfs tracing/events/../../id if ftrace is enabled in the
+ * kernel."
+ */
+ tprintf(", config=%" PRIu64, attr->config);
+ break;
+ case PERF_TYPE_HW_CACHE:
+ /*
+ * (perf_hw_cache_id) | (perf_hw_cache_op_id << 8) |
+ * (perf_hw_cache_op_result_id << 16)
+ */
+ PRINT_XLAT(", config=", perf_hw_cache_id, attr->config & 0xFF,
+ "PERF_COUNT_HW_CACHE_???");
+ PRINT_XLAT("|", perf_hw_cache_op_id, (attr->config >> 8) & 0xFF,
+ "PERF_COUNT_HW_CACHE_OP_???");
+ /*
+ * Current code (see set_ext_hw_attr in arch/x86/events/core.c,
+ * tile_map_cache_event in arch/tile/kernel/perf_event.c,
+ * arc_pmu_cache_event in arch/arc/kernel/perf_event.c,
+ * hw_perf_cache_event in arch/blackfin/kernel/perf_event.c,
+ * _hw_perf_cache_event in arch/metag/kernel/perf/perf_event.c,
+ * mipspmu_map_cache_event in arch/mips/kernel/perf_event_mipsxx.c,
+ * hw_perf_cache_event in arch/powerpc/perf/core-book3s.c,
+ * hw_perf_cache_event in arch/powerpc/perf/core-fsl-emb.c,
+ * hw_perf_cache_event in arch/sh/kernel/perf_event.c,
+ * sparc_map_cache_event in arch/sparc/kernel/perf_event.c,
+ * xtensa_pmu_cache_event in arch/xtensa/kernel/perf_event.c,
+ * armpmu_map_cache_event in drivers/perf/arm_pmu.c) assumes
+ * that cache result is 8 bits in size.
+ */
+ PRINT_XLAT("<<8|", perf_hw_cache_op_result_id,
+ (attr->config >> 16) & 0xFF,
+ "PERF_COUNT_HW_CACHE_RESULT_???");
+ tprintf("<<16");
+ if (attr->config >> 24)
+ tprintf("|%#" PRIx64 "<<24 "
+ "/* PERF_COUNT_HW_CACHE_??? */",
+ attr->config >> 24);
+ break;
+ case PERF_TYPE_RAW:
+ /*
+ * "If type is PERF_TYPE_RAW, then a custom "raw" config
+ * value is needed. Most CPUs support events that are not
+ * covered by the "generalized" events. These are
+ * implementation defined; see your CPU manual (for example the
+ * Intel Volume 3B documentation or the AMD BIOS and Kernel
+ * Developer Guide). The libpfm4 library can be used to
+ * translate from the name in the architectural manuals
+ * to the raw hex value perf_event_open() expects in this
+ * field."
+ */
+ case PERF_TYPE_BREAKPOINT:
+ /*
+ * "If type is PERF_TYPE_BREAKPOINT, then leave config set
+ * to zero. Its parameters are set in other places."
+ */
+ default:
+ tprintf(", config=%#" PRIx64, attr->config);
+ break;
+ }
+
+ if (abbrev(tcp))
+ goto print_perf_event_attr_out;
+
+ if (attr->freq)
+ tprintf(", sample_freq=%" PRIu64, attr->sample_freq);
+ else
+ tprintf(", sample_period=%" PRIu64, attr->sample_period);
+
+ tprintf(", sample_type=");
+ printflags64(perf_event_sample_format, attr->sample_type,
+ "PERF_SAMPLE_???");
+
+ tprintf(", read_format=");
+ printflags64(perf_event_read_format, attr->read_format,
+ "PERF_FORMAT_???");
+
+ tprintf(", disabled=%u"
+ ", inherit=%u"
+ ", pinned=%u"
+ ", exclusive=%u"
+ ", exclusive_user=%u"
+ ", exclude_kernel=%u"
+ ", exclude_hv=%u"
+ ", exclude_idle=%u"
+ ", mmap=%u"
+ ", comm=%u"
+ ", freq=%u"
+ ", inherit_stat=%u"
+ ", enable_on_exec=%u"
+ ", task=%u"
+ ", watermark=%u"
+ ", precise_ip=%u /* %s */"
+ ", mmap_data=%u"
+ ", sample_id_all=%u"
+ ", exclude_host=%u"
+ ", exclude_guest=%u"
+ ", exclude_callchain_kernel=%u"
+ ", exclude_callchain_user=%u"
+ ", mmap2=%u"
+ ", comm_exec=%u"
+ ", use_clockid=%u"
+ ", context_switch=%u"
+ ", write_backward=%u",
+ attr->disabled,
+ attr->inherit,
+ attr->pinned,
+ attr->exclusive,
+ attr->exclude_user,
+ attr->exclude_kernel,
+ attr->exclude_hv,
+ attr->exclude_idle,
+ attr->mmap,
+ attr->comm,
+ attr->freq,
+ attr->inherit_stat,
+ attr->enable_on_exec,
+ attr->task,
+ attr->watermark,
+ attr->precise_ip, precise_ip_desc[attr->precise_ip],
+ attr->mmap_data,
+ attr->sample_id_all,
+ attr->exclude_host,
+ attr->exclude_guest,
+ attr->exclude_callchain_kernel,
+ attr->exclude_callchain_user,
+ attr->mmap2,
+ attr->comm_exec,
+ attr->use_clockid,
+ attr->context_switch,
+ attr->write_backward);
+
+ /*
+ * Print it only in case it is non-zero, since it may contain flags we
+ * are not aware about.
+ */
+ if (attr->__reserved_1)
+ tprintf(", __reserved_1=%#llx /* Bits 63..28 */",
+ (unsigned long long) attr->__reserved_1);
+
+ if (attr->watermark)
+ tprintf(", wakeup_watermark=%u", attr->wakeup_watermark);
+ else
+ tprintf(", wakeup_events=%u", attr->wakeup_events);
+
+ if (attr->type == PERF_TYPE_BREAKPOINT)
+ /* Any combination of R/W with X is deemed invalid */
+ PRINT_XLAT(", bp_type=", hw_breakpoint_type, attr->bp_type,
+ (attr->bp_type <=
+ (HW_BREAKPOINT_X | HW_BREAKPOINT_RW)) ?
+ "HW_BREAKPOINT_INVALID" :
+ "HW_BREAKPOINT_???");
+
+ if (attr->type == PERF_TYPE_BREAKPOINT)
+ tprintf(", bp_addr=%#" PRIx64, attr->bp_addr);
+ else
+ tprintf(", config1=%#" PRIx64, attr->config1);
+
+ /*
+ * Fields after bp_addr/config1 are optional and may not present; check
+ * against size is needed.
+ */
+
+ _PERF_CHECK_FIELD(bp_len);
+ if (attr->type == PERF_TYPE_BREAKPOINT)
+ tprintf(", bp_len=%" PRIu64, attr->bp_len);
+ else
+ tprintf(", config2=%#" PRIx64, attr->config2);
+
+ _PERF_CHECK_FIELD(branch_sample_type);
+ if (attr->sample_type & PERF_SAMPLE_BRANCH_STACK) {
+ tprintf(", branch_sample_type=");
+ printflags64(perf_branch_sample_type, attr->branch_sample_type,
+ "PERF_SAMPLE_BRANCH_???");
+ }
+
+ _PERF_CHECK_FIELD(sample_regs_user);
+ /*
+ * "This bit mask defines the set of user CPU registers to dump on
+ * samples. The layout of the register mask is architecture-specific and
+ * described in the kernel header
+ * arch/ARCH/include/uapi/asm/perf_regs.h."
+ */
+ tprintf(", sample_regs_user=%#" PRIx64, attr->sample_regs_user);
+
+ _PERF_CHECK_FIELD(sample_stack_user);
+ /*
+ * "size of the user stack to dump if PERF_SAMPLE_STACK_USER is
+ * specified."
+ */
+ if (attr->sample_type & PERF_SAMPLE_STACK_USER)
+ tprintf(", sample_stack_user=%#" PRIx32,
+ attr->sample_stack_user);
+
+ if (attr->use_clockid) {
+ _PERF_CHECK_FIELD(clockid);
+ tprintf(", clockid=");
+ printxval(clocknames, attr->clockid, "CLOCK_???");
+ }
+
+ _PERF_CHECK_FIELD(sample_regs_intr);
+ tprintf(", sample_regs_intr=%#" PRIx64, attr->sample_regs_intr);
+
+ _PERF_CHECK_FIELD(aux_watermark);
+ tprintf(", aux_watermark=%" PRIu32, attr->aux_watermark);
+
+ _PERF_CHECK_FIELD(sample_max_stack);
+ tprintf(", sample_max_stack=%" PRIu16, attr->sample_max_stack);
+
+ /* _PERF_CHECK_FIELD(__reserved_2);
+ tprintf(", __reserved2=%" PRIu16, attr->__reserved_2); */
+
+print_perf_event_attr_out:
+ if ((attr->size && (attr->size > size)) ||
+ (!attr->size && (size < PERF_ATTR_SIZE_VER0)))
+ tprintf(", ...");
+
+ tprintf("}");
+}
SYS_FUNC(perf_event_open)
{
- printaddr(tcp->u_arg[0]);
+ /*
+ * We try to copy out the whole structure on entering in order to check
+ * size value on exiting. We do not check the rest of the fields because
+ * they shouldn't be changed, but copy the whole structure instead
+ * of just size field because they could.
+ */
+ if (entering(tcp)) {
+ if (!fetch_perf_event_attr(tcp, tcp->u_arg[0]))
+ return 0;
+ } else {
+ print_perf_event_attr(tcp, tcp->u_arg[0]);
+ }
+
tprintf(", %d, %d, %d, ",
(int) tcp->u_arg[1],
(int) tcp->u_arg[2],
(int) tcp->u_arg[3]);
- printflags(perf_event_open_flags, tcp->u_arg[4], "PERF_FLAG_???");
+ printflags_long(perf_event_open_flags, tcp->u_arg[4], "PERF_FLAG_???");
- return RVAL_DECODED;
+ return RVAL_DECODED | RVAL_FD;
}
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