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/*
* Copyright 2015, Michael Neuling, IBM Corp.
* Licensed under GPLv2.
*
* 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());
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");
}
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