// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2015 , Michael Neuling , IBM Corp .
*
* Original : Michael Neuling 4 / 12 / 2013
* Edited : Rashmica Gupta 4 / 12 / 2015
*
* See if the altivec state is leaked out of an aborted transaction due to
* kernel vmx copy loops .
*
* When the transaction aborts , VSR values should rollback to the values
* they held before the transaction commenced . Using VSRs while transaction
* is suspended should not affect the checkpointed values .
*
* ( 1 ) write A to a VSR
* ( 2 ) start transaction
* ( 3 ) suspend transaction
* ( 4 ) change the VSR to B
* ( 5 ) trigger kernel vmx copy loop
* ( 6 ) abort transaction
* ( 7 ) check that the VSR value is A
*/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
#include <assert.h>
#include "tm.h"
#include "utils.h"
int test_vmxcopy()
{
long double vecin = 1 .3 ;
long double vecout;
unsigned long pgsize = getpagesize();
int i;
int fd;
int size = pgsize*16 ;
char tmpfile[] = "/tmp/page_faultXXXXXX" ;
char buf[pgsize];
char *a;
uint64_t aborted = 0 ;
SKIP_IF(!have_htm());
SKIP_IF(htm_is_synthetic());
SKIP_IF(!is_ppc64le());
fd = mkstemp(tmpfile);
assert(fd >= 0 );
memset(buf, 0 , pgsize);
for (i = 0 ; i < size; i += pgsize)
assert(write(fd, buf, pgsize) == pgsize);
unlink(tmpfile);
a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0 );
assert(a != MAP_FAILED);
asm __volatile__(
"lxvd2x 40,0,%[vecinptr];" /* set 40 to initial value*/
"tbegin.;"
"beq 3f;"
"tsuspend.;"
"xxlxor 40,40,40;" /* set 40 to 0 */
"std 5, 0(%[map]);" /* cause kernel vmx copy page */
"tabort. 0;"
"tresume.;"
"tend.;"
"li %[res], 0;"
"b 5f;"
/* Abort handler */
"3:;"
"li %[res], 1;"
"5:;"
"stxvd2x 40,0,%[vecoutptr];"
: [res]"=&r" (aborted)
: [vecinptr]"r" (&vecin),
[vecoutptr]"r" (&vecout),
[map]"r" (a)
: "memory" , "r0" , "r3" , "r4" , "r5" , "r6" , "r7" );
if (aborted && (vecin != vecout)){
printf("FAILED: vector state leaked on abort %f != %f\n" ,
(double )vecin, (double )vecout);
return 1 ;
}
munmap(a, size);
close(fd);
return 0 ;
}
int main(void )
{
return test_harness(test_vmxcopy, "tm_vmxcopy" );
}
Messung V0.5 in Prozent C=94 H=80 G=87
¤ Dauer der Verarbeitung: 0.3 Sekunden
¤
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