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Disable the unsupported events from the bit vector length in EAX.

This commit is contained in:
msaitoh 2022-06-13 09:28:58 +00:00
parent d80c914270
commit 052df59bc6
1 changed files with 11 additions and 3 deletions
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14
usr.sbin/tprof/arch/tprof_x86.c
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@ -1,4 +1,4 @@
/* $NetBSD: tprof_x86.c,v 1.11 2022/06/13 07:40:58 msaitoh Exp $ */
/* $NetBSD: tprof_x86.c,v 1.12 2022/06/13 09:28:58 msaitoh Exp $ */
/*
* Copyright (c) 2018-2019 The NetBSD Foundation, Inc.
@ -99,7 +99,7 @@ static struct event_table intel_arch1 = {
static struct event_table *
init_intel_arch1(void)
{
unsigned int eax, ebx, ecx, edx;
unsigned int eax, ebx, ecx, edx, vectorlen;
struct event_table *table;
size_t i;
@ -109,9 +109,17 @@ init_intel_arch1(void)
edx = 0;
x86_cpuid(&eax, &ebx, &ecx, &edx);
vectorlen = __SHIFTOUT(eax, CPUID_PERF_BVECLEN);
table = &intel_arch1;
for (i = 0; i < table->nevents; i++) {
/* Disable the unsupported events. */
/*
* Disable the unsupported events from:
* a) the bit vector length in EAX.
* b) the disable bit in EBX.
*/
if (i >= vectorlen)
table->names[i].enabled = false;
if ((ebx & (i << 1)) != 0)
table->names[i].enabled = false;
}