// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2015, Michael Neuling, IBM Corp.
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* Original: Michael Neuling 19/7/2013
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* Edited: Rashmica Gupta 01/12/2015
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*
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* Do some transactions, see if the tar is corrupted.
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* If the transaction is aborted, the TAR should be rolled back to the
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* checkpointed value before the transaction began. The value written to
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* TAR in suspended mode should only remain in TAR if the transaction
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* completes.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "tm.h"
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#include "utils.h"
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int num_loops = 10000;
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int test_tar(void)
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{
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int i;
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SKIP_IF(!have_htm());
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SKIP_IF(!is_ppc64le());
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for (i = 0; i < num_loops; i++)
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{
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uint64_t result = 0;
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asm __volatile__(
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"li 7, 1;"
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"mtspr %[tar], 7;" /* tar = 1 */
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"tbegin.;"
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"beq 3f;"
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"li 4, 0x7000;" /* Loop lots, to use time */
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"2:;" /* Start loop */
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"li 7, 2;"
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"mtspr %[tar], 7;" /* tar = 2 */
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"tsuspend.;"
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"li 7, 3;"
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"mtspr %[tar], 7;" /* tar = 3 */
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"tresume.;"
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"subi 4, 4, 1;"
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"cmpdi 4, 0;"
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"bne 2b;"
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"tend.;"
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/* Transaction sucess! TAR should be 3 */
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"mfspr 7, %[tar];"
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"ori %[res], 7, 4;" // res = 3|4 = 7
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"b 4f;"
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/* Abort handler. TAR should be rolled back to 1 */
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"3:;"
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"mfspr 7, %[tar];"
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"ori %[res], 7, 8;" // res = 1|8 = 9
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"4:;"
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: [res]"=r"(result)
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: [tar]"i"(SPRN_TAR)
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: "memory", "r0", "r4", "r7");
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/* If result is anything else other than 7 or 9, the tar
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* value must have been corrupted. */
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if ((result != 7) && (result != 9))
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return 1;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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/* A low number of iterations (eg 100) can cause a false pass */
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if (argc > 1) {
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if (strcmp(argv[1], "-h") == 0) {
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printf("Syntax:\n\t%s [<num loops>]\n",
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argv[0]);
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return 1;
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} else {
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num_loops = atoi(argv[1]);
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}
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}
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printf("Starting, %d loops\n", num_loops);
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return test_harness(test_tar, "tm_tar");
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}
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