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/*
* Copyright 2015, Michael Neuling, IBM Corp.
* Licensed under GPLv2.
* Original: Michael Neuling 19/7/2013
* Edited: Rashmica Gupta 01/12/2015
*
* Do some transactions, see if the tar is corrupted.
* If the transaction is aborted, the TAR should be rolled back to the
* checkpointed value before the transaction began. The value written to
* TAR in suspended mode should only remain in TAR if the transaction
* completes.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "tm.h"
#include "utils.h"
int num_loops = 10000;
int test_tar(void)
{
int i;
SKIP_IF(!have_htm());
for (i = 0; i < num_loops; i++)
{
uint64_t result = 0;
asm __volatile__(
"li 7, 1;"
"mtspr %[tar], 7;" /* tar = 1 */
"tbegin.;"
"beq 3f;"
"li 4, 0x7000;" /* Loop lots, to use time */
"2:;" /* Start loop */
"li 7, 2;"
"mtspr %[tar], 7;" /* tar = 2 */
"tsuspend.;"
"li 7, 3;"
"mtspr %[tar], 7;" /* tar = 3 */
"tresume.;"
"subi 4, 4, 1;"
"cmpdi 4, 0;"
"bne 2b;"
"tend.;"
/* Transaction sucess! TAR should be 3 */
"mfspr 7, %[tar];"
"ori %[res], 7, 4;" // res = 3|4 = 7
"b 4f;"
/* Abort handler. TAR should be rolled back to 1 */
"3:;"
"mfspr 7, %[tar];"
"ori %[res], 7, 8;" // res = 1|8 = 9
"4:;"
: [res]"=r"(result)
: [tar]"i"(SPRN_TAR)
: "memory", "r0", "r4", "r7");
/* If result is anything else other than 7 or 9, the tar
* value must have been corrupted. */
if ((result != 7) && (result != 9))
return 1;
}
return 0;
}
int main(int argc, char *argv[])
{
/* A low number of iterations (eg 100) can cause a false pass */
if (argc > 1) {
if (strcmp(argv[1], "-h") == 0) {
printf("Syntax:\n\t%s [<num loops>]\n",
argv[0]);
return 1;
} else {
num_loops = atoi(argv[1]);
}
}
printf("Starting, %d loops\n", num_loops);
return test_harness(test_tar, "tm_tar");
}
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