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alistair23-linux/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
Josh Poimboeuf 00a263902a perf intel-pt: Use shared x86 insn decoder 
Now that there's a common version of the decoder for all tools, use it
instead of the local copy.

Also use perf's check-headers.sh script to diff the decoder files to
make sure they remain in sync with the kernel version.  Objtool has a
similar check.

Committer notes:

Had to keep this all pointing explicitely to x86 headers/files, i.e.
instead of asm/isnn.h we had to use ../include/asm/insn.h when the files
were in differemt dirs, or just replace "<asm/foo.h>" with "foo.h".

This way we continue to be able to process perf.data files with Intel PT
traces in distros other than x86.

Also fixed up the awk script paths to use $(srcdir)/tools/arch instead
or relative directories so that we keep detached tarballs (make help |
grep perf) working.

For now the include lines in these headers are being ignored so as not
to flag false reports of kernel/tools out of sync.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/8a37e615d2880f039505d693d1e068a009358a2b.1567118001.git.jpoimboe@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-08-31 22:27:52 -03:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* intel_pt_insn_decoder.c: Intel Processor Trace support
* Copyright (c) 2013-2014, Intel Corporation.
*/
#include <linux/kernel.h>
#include <stdio.h>
#include <string.h>
#include <endian.h>
#include <byteswap.h>
#include "../../../arch/x86/include/asm/insn.h"
#include "../../../arch/x86/lib/inat.c"
#include "../../../arch/x86/lib/insn.c"
#include "event.h"
#include "intel-pt-insn-decoder.h"
#include "dump-insn.h"
#if INTEL_PT_INSN_BUF_SZ < MAX_INSN_SIZE || INTEL_PT_INSN_BUF_SZ > MAX_INSN
#error Instruction buffer size too small
#endif
/* Based on branch_type() from arch/x86/events/intel/lbr.c */
static void intel_pt_insn_decoder(struct insn *insn,
struct intel_pt_insn *intel_pt_insn)
{
enum intel_pt_insn_op op = INTEL_PT_OP_OTHER;
enum intel_pt_insn_branch branch = INTEL_PT_BR_NO_BRANCH;
int ext;
intel_pt_insn->rel = 0;
if (insn_is_avx(insn)) {
intel_pt_insn->op = INTEL_PT_OP_OTHER;
intel_pt_insn->branch = INTEL_PT_BR_NO_BRANCH;
intel_pt_insn->length = insn->length;
return;
}
switch (insn->opcode.bytes[0]) {
case 0xf:
switch (insn->opcode.bytes[1]) {
case 0x05: /* syscall */
case 0x34: /* sysenter */
op = INTEL_PT_OP_SYSCALL;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0x07: /* sysret */
case 0x35: /* sysexit */
op = INTEL_PT_OP_SYSRET;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0x80 ... 0x8f: /* jcc */
op = INTEL_PT_OP_JCC;
branch = INTEL_PT_BR_CONDITIONAL;
break;
default:
break;
}
break;
case 0x70 ... 0x7f: /* jcc */
op = INTEL_PT_OP_JCC;
branch = INTEL_PT_BR_CONDITIONAL;
break;
case 0xc2: /* near ret */
case 0xc3: /* near ret */
case 0xca: /* far ret */
case 0xcb: /* far ret */
op = INTEL_PT_OP_RET;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0xcf: /* iret */
op = INTEL_PT_OP_IRET;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0xcc ... 0xce: /* int */
op = INTEL_PT_OP_INT;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0xe8: /* call near rel */
op = INTEL_PT_OP_CALL;
branch = INTEL_PT_BR_UNCONDITIONAL;
break;
case 0x9a: /* call far absolute */
op = INTEL_PT_OP_CALL;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0xe0 ... 0xe2: /* loop */
op = INTEL_PT_OP_LOOP;
branch = INTEL_PT_BR_CONDITIONAL;
break;
case 0xe3: /* jcc */
op = INTEL_PT_OP_JCC;
branch = INTEL_PT_BR_CONDITIONAL;
break;
case 0xe9: /* jmp */
case 0xeb: /* jmp */
op = INTEL_PT_OP_JMP;
branch = INTEL_PT_BR_UNCONDITIONAL;
break;
case 0xea: /* far jmp */
op = INTEL_PT_OP_JMP;
branch = INTEL_PT_BR_INDIRECT;
break;
case 0xff: /* call near absolute, call far absolute ind */
ext = (insn->modrm.bytes[0] >> 3) & 0x7;
switch (ext) {
case 2: /* near ind call */
case 3: /* far ind call */
op = INTEL_PT_OP_CALL;
branch = INTEL_PT_BR_INDIRECT;
break;
case 4:
case 5:
op = INTEL_PT_OP_JMP;
branch = INTEL_PT_BR_INDIRECT;
break;
default:
break;
}
break;
default:
break;
}
intel_pt_insn->op = op;
intel_pt_insn->branch = branch;
intel_pt_insn->length = insn->length;
if (branch == INTEL_PT_BR_CONDITIONAL ||
branch == INTEL_PT_BR_UNCONDITIONAL) {
#if __BYTE_ORDER == __BIG_ENDIAN
switch (insn->immediate.nbytes) {
case 1:
intel_pt_insn->rel = insn->immediate.value;
break;
case 2:
intel_pt_insn->rel =
bswap_16((short)insn->immediate.value);
break;
case 4:
intel_pt_insn->rel = bswap_32(insn->immediate.value);
break;
default:
intel_pt_insn->rel = 0;
break;
}
#else
intel_pt_insn->rel = insn->immediate.value;
#endif
}
}
int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64,
struct intel_pt_insn *intel_pt_insn)
{
struct insn insn;
insn_init(&insn, buf, len, x86_64);
insn_get_length(&insn);
if (!insn_complete(&insn) || insn.length > len)
return -1;
intel_pt_insn_decoder(&insn, intel_pt_insn);
if (insn.length < INTEL_PT_INSN_BUF_SZ)
memcpy(intel_pt_insn->buf, buf, insn.length);
else
memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_BUF_SZ);
return 0;
}
int arch_is_branch(const unsigned char *buf, size_t len, int x86_64)
{
struct intel_pt_insn in;
if (intel_pt_get_insn(buf, len, x86_64, &in) < 0)
return -1;
return in.branch != INTEL_PT_BR_NO_BRANCH;
}
const char *dump_insn(struct perf_insn *x, uint64_t ip __maybe_unused,
u8 *inbuf, int inlen, int *lenp)
{
struct insn insn;
int n, i;
int left;
insn_init(&insn, inbuf, inlen, x->is64bit);
insn_get_length(&insn);
if (!insn_complete(&insn) || insn.length > inlen)
return "<bad>";
if (lenp)
*lenp = insn.length;
left = sizeof(x->out);
n = snprintf(x->out, left, "insn: ");
left -= n;
for (i = 0; i < insn.length; i++) {
n += snprintf(x->out + n, left, "%02x ", inbuf[i]);
left -= n;
}
return x->out;
}
const char *branch_name[] = {
[INTEL_PT_OP_OTHER] = "Other",
[INTEL_PT_OP_CALL] = "Call",
[INTEL_PT_OP_RET] = "Ret",
[INTEL_PT_OP_JCC] = "Jcc",
[INTEL_PT_OP_JMP] = "Jmp",
[INTEL_PT_OP_LOOP] = "Loop",
[INTEL_PT_OP_IRET] = "IRet",
[INTEL_PT_OP_INT] = "Int",
[INTEL_PT_OP_SYSCALL] = "Syscall",
[INTEL_PT_OP_SYSRET] = "Sysret",
};
const char *intel_pt_insn_name(enum intel_pt_insn_op op)
{
return branch_name[op];
}
int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf,
size_t buf_len)
{
switch (intel_pt_insn->branch) {
case INTEL_PT_BR_CONDITIONAL:
case INTEL_PT_BR_UNCONDITIONAL:
return snprintf(buf, buf_len, "%s %s%d",
intel_pt_insn_name(intel_pt_insn->op),
intel_pt_insn->rel > 0 ? "+" : "",
intel_pt_insn->rel);
case INTEL_PT_BR_NO_BRANCH:
case INTEL_PT_BR_INDIRECT:
return snprintf(buf, buf_len, "%s",
intel_pt_insn_name(intel_pt_insn->op));
default:
break;
}
return 0;
}
int intel_pt_insn_type(enum intel_pt_insn_op op)
{
switch (op) {
case INTEL_PT_OP_OTHER:
return 0;
case INTEL_PT_OP_CALL:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL;
case INTEL_PT_OP_RET:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN;
case INTEL_PT_OP_JCC:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL;
case INTEL_PT_OP_JMP:
return PERF_IP_FLAG_BRANCH;
case INTEL_PT_OP_LOOP:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL;
case INTEL_PT_OP_IRET:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN |
PERF_IP_FLAG_INTERRUPT;
case INTEL_PT_OP_INT:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL |
PERF_IP_FLAG_INTERRUPT;
case INTEL_PT_OP_SYSCALL:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL |
PERF_IP_FLAG_SYSCALLRET;
case INTEL_PT_OP_SYSRET:
return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN |
PERF_IP_FLAG_SYSCALLRET;
default:
return 0;
}
}
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