531 lines
12 KiB
C
531 lines
12 KiB
C
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/*
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* intel_pt_pkt_decoder.c: Intel Processor Trace support
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* Copyright (c) 2013-2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <endian.h>
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#include <byteswap.h>
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#include <linux/compiler.h>
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#include "intel-pt-pkt-decoder.h"
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#define BIT(n) (1 << (n))
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#define BIT63 ((uint64_t)1 << 63)
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#define NR_FLAG BIT63
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define le16_to_cpu bswap_16
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#define le32_to_cpu bswap_32
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#define le64_to_cpu bswap_64
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#define memcpy_le64(d, s, n) do { \
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memcpy((d), (s), (n)); \
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*(d) = le64_to_cpu(*(d)); \
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} while (0)
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#else
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#define le16_to_cpu
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#define le32_to_cpu
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#define le64_to_cpu
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#define memcpy_le64 memcpy
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#endif
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static const char * const packet_name[] = {
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[INTEL_PT_BAD] = "Bad Packet!",
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[INTEL_PT_PAD] = "PAD",
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[INTEL_PT_TNT] = "TNT",
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[INTEL_PT_TIP_PGD] = "TIP.PGD",
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[INTEL_PT_TIP_PGE] = "TIP.PGE",
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[INTEL_PT_TSC] = "TSC",
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[INTEL_PT_TMA] = "TMA",
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[INTEL_PT_MODE_EXEC] = "MODE.Exec",
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[INTEL_PT_MODE_TSX] = "MODE.TSX",
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[INTEL_PT_MTC] = "MTC",
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[INTEL_PT_TIP] = "TIP",
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[INTEL_PT_FUP] = "FUP",
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[INTEL_PT_CYC] = "CYC",
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[INTEL_PT_VMCS] = "VMCS",
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[INTEL_PT_PSB] = "PSB",
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[INTEL_PT_PSBEND] = "PSBEND",
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[INTEL_PT_CBR] = "CBR",
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[INTEL_PT_TRACESTOP] = "TraceSTOP",
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[INTEL_PT_PIP] = "PIP",
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[INTEL_PT_OVF] = "OVF",
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[INTEL_PT_MNT] = "MNT",
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};
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const char *intel_pt_pkt_name(enum intel_pt_pkt_type type)
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{
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return packet_name[type];
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}
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static int intel_pt_get_long_tnt(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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uint64_t payload;
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int count;
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if (len < 8)
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return INTEL_PT_NEED_MORE_BYTES;
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payload = le64_to_cpu(*(uint64_t *)buf);
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for (count = 47; count; count--) {
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if (payload & BIT63)
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break;
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payload <<= 1;
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}
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packet->type = INTEL_PT_TNT;
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packet->count = count;
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packet->payload = payload << 1;
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return 8;
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}
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static int intel_pt_get_pip(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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uint64_t payload = 0;
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if (len < 8)
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return INTEL_PT_NEED_MORE_BYTES;
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packet->type = INTEL_PT_PIP;
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memcpy_le64(&payload, buf + 2, 6);
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packet->payload = payload >> 1;
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if (payload & 1)
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packet->payload |= NR_FLAG;
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return 8;
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}
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static int intel_pt_get_tracestop(struct intel_pt_pkt *packet)
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{
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packet->type = INTEL_PT_TRACESTOP;
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return 2;
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}
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static int intel_pt_get_cbr(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 4)
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return INTEL_PT_NEED_MORE_BYTES;
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packet->type = INTEL_PT_CBR;
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packet->payload = buf[2];
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return 4;
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}
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static int intel_pt_get_vmcs(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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unsigned int count = (52 - 5) >> 3;
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if (count < 1 || count > 7)
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return INTEL_PT_BAD_PACKET;
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if (len < count + 2)
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return INTEL_PT_NEED_MORE_BYTES;
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packet->type = INTEL_PT_VMCS;
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packet->count = count;
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memcpy_le64(&packet->payload, buf + 2, count);
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return count + 2;
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}
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static int intel_pt_get_ovf(struct intel_pt_pkt *packet)
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{
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packet->type = INTEL_PT_OVF;
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return 2;
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}
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static int intel_pt_get_psb(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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int i;
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if (len < 16)
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return INTEL_PT_NEED_MORE_BYTES;
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for (i = 2; i < 16; i += 2) {
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if (buf[i] != 2 || buf[i + 1] != 0x82)
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return INTEL_PT_BAD_PACKET;
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}
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packet->type = INTEL_PT_PSB;
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return 16;
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}
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static int intel_pt_get_psbend(struct intel_pt_pkt *packet)
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{
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packet->type = INTEL_PT_PSBEND;
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return 2;
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}
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static int intel_pt_get_tma(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 7)
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return INTEL_PT_NEED_MORE_BYTES;
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packet->type = INTEL_PT_TMA;
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packet->payload = buf[2] | (buf[3] << 8);
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packet->count = buf[5] | ((buf[6] & BIT(0)) << 8);
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return 7;
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}
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static int intel_pt_get_pad(struct intel_pt_pkt *packet)
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{
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packet->type = INTEL_PT_PAD;
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return 1;
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}
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static int intel_pt_get_mnt(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 11)
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return INTEL_PT_NEED_MORE_BYTES;
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packet->type = INTEL_PT_MNT;
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memcpy_le64(&packet->payload, buf + 3, 8);
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return 11
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;
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}
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static int intel_pt_get_3byte(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 3)
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return INTEL_PT_NEED_MORE_BYTES;
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switch (buf[2]) {
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case 0x88: /* MNT */
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return intel_pt_get_mnt(buf, len, packet);
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default:
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return INTEL_PT_BAD_PACKET;
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}
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}
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static int intel_pt_get_ext(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 2)
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return INTEL_PT_NEED_MORE_BYTES;
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switch (buf[1]) {
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case 0xa3: /* Long TNT */
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return intel_pt_get_long_tnt(buf, len, packet);
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case 0x43: /* PIP */
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return intel_pt_get_pip(buf, len, packet);
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case 0x83: /* TraceStop */
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return intel_pt_get_tracestop(packet);
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case 0x03: /* CBR */
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return intel_pt_get_cbr(buf, len, packet);
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case 0xc8: /* VMCS */
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return intel_pt_get_vmcs(buf, len, packet);
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case 0xf3: /* OVF */
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return intel_pt_get_ovf(packet);
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case 0x82: /* PSB */
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return intel_pt_get_psb(buf, len, packet);
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case 0x23: /* PSBEND */
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return intel_pt_get_psbend(packet);
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case 0x73: /* TMA */
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return intel_pt_get_tma(buf, len, packet);
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case 0xC3: /* 3-byte header */
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return intel_pt_get_3byte(buf, len, packet);
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default:
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return INTEL_PT_BAD_PACKET;
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}
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}
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static int intel_pt_get_short_tnt(unsigned int byte,
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struct intel_pt_pkt *packet)
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{
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int count;
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for (count = 6; count; count--) {
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if (byte & BIT(7))
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break;
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byte <<= 1;
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}
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packet->type = INTEL_PT_TNT;
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packet->count = count;
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packet->payload = (uint64_t)byte << 57;
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return 1;
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}
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static int intel_pt_get_cyc(unsigned int byte, const unsigned char *buf,
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size_t len, struct intel_pt_pkt *packet)
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{
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unsigned int offs = 1, shift;
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uint64_t payload = byte >> 3;
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byte >>= 2;
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len -= 1;
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for (shift = 5; byte & 1; shift += 7) {
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if (offs > 9)
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return INTEL_PT_BAD_PACKET;
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if (len < offs)
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return INTEL_PT_NEED_MORE_BYTES;
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byte = buf[offs++];
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payload |= ((uint64_t)byte >> 1) << shift;
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}
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packet->type = INTEL_PT_CYC;
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packet->payload = payload;
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return offs;
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}
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static int intel_pt_get_ip(enum intel_pt_pkt_type type, unsigned int byte,
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const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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int ip_len;
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packet->count = byte >> 5;
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switch (packet->count) {
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case 0:
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ip_len = 0;
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break;
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case 1:
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if (len < 3)
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return INTEL_PT_NEED_MORE_BYTES;
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ip_len = 2;
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packet->payload = le16_to_cpu(*(uint16_t *)(buf + 1));
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break;
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case 2:
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if (len < 5)
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return INTEL_PT_NEED_MORE_BYTES;
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ip_len = 4;
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packet->payload = le32_to_cpu(*(uint32_t *)(buf + 1));
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break;
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case 3:
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case 4:
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if (len < 7)
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return INTEL_PT_NEED_MORE_BYTES;
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ip_len = 6;
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memcpy_le64(&packet->payload, buf + 1, 6);
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break;
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case 6:
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if (len < 9)
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return INTEL_PT_NEED_MORE_BYTES;
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ip_len = 8;
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packet->payload = le64_to_cpu(*(uint64_t *)(buf + 1));
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break;
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default:
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return INTEL_PT_BAD_PACKET;
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}
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packet->type = type;
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return ip_len + 1;
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}
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static int intel_pt_get_mode(const unsigned char *buf, size_t len,
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struct intel_pt_pkt *packet)
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{
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if (len < 2)
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return INTEL_PT_NEED_MORE_BYTES;
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|
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switch (buf[1] >> 5) {
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case 0:
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packet->type = INTEL_PT_MODE_EXEC;
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switch (buf[1] & 3) {
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case 0:
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packet->payload = 16;
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break;
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||
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case 1:
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packet->payload = 64;
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break;
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case 2:
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packet->payload = 32;
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break;
|
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default:
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return INTEL_PT_BAD_PACKET;
|
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}
|
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|
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break;
|
||
|
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case 1:
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packet->type = INTEL_PT_MODE_TSX;
|
||
|
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if ((buf[1] & 3) == 3)
|
||
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return INTEL_PT_BAD_PACKET;
|
||
|
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packet->payload = buf[1] & 3;
|
||
|
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break;
|
||
|
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default:
|
||
|
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return INTEL_PT_BAD_PACKET;
|
||
|
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}
|
||
|
|
|
||
|
|
return 2;
|
||
|
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}
|
||
|
|
|
||
|
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static int intel_pt_get_tsc(const unsigned char *buf, size_t len,
|
||
|
|
struct intel_pt_pkt *packet)
|
||
|
|
{
|
||
|
|
if (len < 8)
|
||
|
|
return INTEL_PT_NEED_MORE_BYTES;
|
||
|
|
packet->type = INTEL_PT_TSC;
|
||
|
|
memcpy_le64(&packet->payload, buf + 1, 7);
|
||
|
|
return 8;
|
||
|
|
}
|
||
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|
||
|
|
static int intel_pt_get_mtc(const unsigned char *buf, size_t len,
|
||
|
|
struct intel_pt_pkt *packet)
|
||
|
|
{
|
||
|
|
if (len < 2)
|
||
|
|
return INTEL_PT_NEED_MORE_BYTES;
|
||
|
|
packet->type = INTEL_PT_MTC;
|
||
|
|
packet->payload = buf[1];
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int intel_pt_do_get_packet(const unsigned char *buf, size_t len,
|
||
|
|
struct intel_pt_pkt *packet)
|
||
|
|
{
|
||
|
|
unsigned int byte;
|
||
|
|
|
||
|
|
memset(packet, 0, sizeof(struct intel_pt_pkt));
|
||
|
|
|
||
|
|
if (!len)
|
||
|
|
return INTEL_PT_NEED_MORE_BYTES;
|
||
|
|
|
||
|
|
byte = buf[0];
|
||
|
|
if (!(byte & BIT(0))) {
|
||
|
|
if (byte == 0)
|
||
|
|
return intel_pt_get_pad(packet);
|
||
|
|
if (byte == 2)
|
||
|
|
return intel_pt_get_ext(buf, len, packet);
|
||
|
|
return intel_pt_get_short_tnt(byte, packet);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((byte & 2))
|
||
|
|
return intel_pt_get_cyc(byte, buf, len, packet);
|
||
|
|
|
||
|
|
switch (byte & 0x1f) {
|
||
|
|
case 0x0D:
|
||
|
|
return intel_pt_get_ip(INTEL_PT_TIP, byte, buf, len, packet);
|
||
|
|
case 0x11:
|
||
|
|
return intel_pt_get_ip(INTEL_PT_TIP_PGE, byte, buf, len,
|
||
|
|
packet);
|
||
|
|
case 0x01:
|
||
|
|
return intel_pt_get_ip(INTEL_PT_TIP_PGD, byte, buf, len,
|
||
|
|
packet);
|
||
|
|
case 0x1D:
|
||
|
|
return intel_pt_get_ip(INTEL_PT_FUP, byte, buf, len, packet);
|
||
|
|
case 0x19:
|
||
|
|
switch (byte) {
|
||
|
|
case 0x99:
|
||
|
|
return intel_pt_get_mode(buf, len, packet);
|
||
|
|
case 0x19:
|
||
|
|
return intel_pt_get_tsc(buf, len, packet);
|
||
|
|
case 0x59:
|
||
|
|
return intel_pt_get_mtc(buf, len, packet);
|
||
|
|
default:
|
||
|
|
return INTEL_PT_BAD_PACKET;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
return INTEL_PT_BAD_PACKET;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int intel_pt_get_packet(const unsigned char *buf, size_t len,
|
||
|
|
struct intel_pt_pkt *packet)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = intel_pt_do_get_packet(buf, len, packet);
|
||
|
|
if (ret > 0) {
|
||
|
|
while (ret < 8 && len > (size_t)ret && !buf[ret])
|
||
|
|
ret += 1;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf,
|
||
|
|
size_t buf_len)
|
||
|
|
{
|
||
|
|
int ret, i, nr;
|
||
|
|
unsigned long long payload = packet->payload;
|
||
|
|
const char *name = intel_pt_pkt_name(packet->type);
|
||
|
|
|
||
|
|
switch (packet->type) {
|
||
|
|
case INTEL_PT_BAD:
|
||
|
|
case INTEL_PT_PAD:
|
||
|
|
case INTEL_PT_PSB:
|
||
|
|
case INTEL_PT_PSBEND:
|
||
|
|
case INTEL_PT_TRACESTOP:
|
||
|
|
case INTEL_PT_OVF:
|
||
|
|
return snprintf(buf, buf_len, "%s", name);
|
||
|
|
case INTEL_PT_TNT: {
|
||
|
|
size_t blen = buf_len;
|
||
|
|
|
||
|
|
ret = snprintf(buf, blen, "%s ", name);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
buf += ret;
|
||
|
|
blen -= ret;
|
||
|
|
for (i = 0; i < packet->count; i++) {
|
||
|
|
if (payload & BIT63)
|
||
|
|
ret = snprintf(buf, blen, "T");
|
||
|
|
else
|
||
|
|
ret = snprintf(buf, blen, "N");
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
buf += ret;
|
||
|
|
blen -= ret;
|
||
|
|
payload <<= 1;
|
||
|
|
}
|
||
|
|
ret = snprintf(buf, blen, " (%d)", packet->count);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
blen -= ret;
|
||
|
|
return buf_len - blen;
|
||
|
|
}
|
||
|
|
case INTEL_PT_TIP_PGD:
|
||
|
|
case INTEL_PT_TIP_PGE:
|
||
|
|
case INTEL_PT_TIP:
|
||
|
|
case INTEL_PT_FUP:
|
||
|
|
if (!(packet->count))
|
||
|
|
return snprintf(buf, buf_len, "%s no ip", name);
|
||
|
|
__fallthrough;
|
||
|
|
case INTEL_PT_CYC:
|
||
|
|
case INTEL_PT_VMCS:
|
||
|
|
case INTEL_PT_MTC:
|
||
|
|
case INTEL_PT_MNT:
|
||
|
|
case INTEL_PT_CBR:
|
||
|
|
case INTEL_PT_TSC:
|
||
|
|
return snprintf(buf, buf_len, "%s 0x%llx", name, payload);
|
||
|
|
case INTEL_PT_TMA:
|
||
|
|
return snprintf(buf, buf_len, "%s CTC 0x%x FC 0x%x", name,
|
||
|
|
(unsigned)payload, packet->count);
|
||
|
|
case INTEL_PT_MODE_EXEC:
|
||
|
|
return snprintf(buf, buf_len, "%s %lld", name, payload);
|
||
|
|
case INTEL_PT_MODE_TSX:
|
||
|
|
return snprintf(buf, buf_len, "%s TXAbort:%u InTX:%u",
|
||
|
|
name, (unsigned)(payload >> 1) & 1,
|
||
|
|
(unsigned)payload & 1);
|
||
|
|
case INTEL_PT_PIP:
|
||
|
|
nr = packet->payload & NR_FLAG ? 1 : 0;
|
||
|
|
payload &= ~NR_FLAG;
|
||
|
|
ret = snprintf(buf, buf_len, "%s 0x%llx (NR=%d)",
|
||
|
|
name, payload, nr);
|
||
|
|
return ret;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return snprintf(buf, buf_len, "%s 0x%llx (%d)",
|
||
|
|
name, payload, packet->count);
|
||
|
|
}
|