1 /* 2 * Copyright 2015, Michael Neuling, IBM Corp. 3 * Licensed under GPLv2. 4 * Original: Michael Neuling 19/7/2013 5 * Edited: Rashmica Gupta 01/12/2015 6 * 7 * Do some transactions, see if the tar is corrupted. 8 * If the transaction is aborted, the TAR should be rolled back to the 9 * checkpointed value before the transaction began. The value written to 10 * TAR in suspended mode should only remain in TAR if the transaction 11 * completes. 12 */ 13 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <unistd.h> 17 #include <string.h> 18 19 #include "tm.h" 20 #include "utils.h" 21 22 int num_loops = 10000; 23 24 int test_tar(void) 25 { 26 int i; 27 28 SKIP_IF(!have_htm()); 29 30 for (i = 0; i < num_loops; i++) 31 { 32 uint64_t result = 0; 33 asm __volatile__( 34 "li 7, 1;" 35 "mtspr %[tar], 7;" /* tar = 1 */ 36 "tbegin.;" 37 "beq 3f;" 38 "li 4, 0x7000;" /* Loop lots, to use time */ 39 "2:;" /* Start loop */ 40 "li 7, 2;" 41 "mtspr %[tar], 7;" /* tar = 2 */ 42 "tsuspend.;" 43 "li 7, 3;" 44 "mtspr %[tar], 7;" /* tar = 3 */ 45 "tresume.;" 46 "subi 4, 4, 1;" 47 "cmpdi 4, 0;" 48 "bne 2b;" 49 "tend.;" 50 51 /* Transaction sucess! TAR should be 3 */ 52 "mfspr 7, %[tar];" 53 "ori %[res], 7, 4;" // res = 3|4 = 7 54 "b 4f;" 55 56 /* Abort handler. TAR should be rolled back to 1 */ 57 "3:;" 58 "mfspr 7, %[tar];" 59 "ori %[res], 7, 8;" // res = 1|8 = 9 60 "4:;" 61 62 : [res]"=r"(result) 63 : [tar]"i"(SPRN_TAR) 64 : "memory", "r0", "r4", "r7"); 65 66 /* If result is anything else other than 7 or 9, the tar 67 * value must have been corrupted. */ 68 if ((result != 7) && (result != 9)) 69 return 1; 70 } 71 return 0; 72 } 73 74 int main(int argc, char *argv[]) 75 { 76 /* A low number of iterations (eg 100) can cause a false pass */ 77 if (argc > 1) { 78 if (strcmp(argv[1], "-h") == 0) { 79 printf("Syntax:\n\t%s [<num loops>]\n", 80 argv[0]); 81 return 1; 82 } else { 83 num_loops = atoi(argv[1]); 84 } 85 } 86 87 printf("Starting, %d loops\n", num_loops); 88 89 return test_harness(test_tar, "tm_tar"); 90 } 91