1 /* 2 * Copyright 2015, Michael Neuling, IBM Corp. 3 * Licensed under GPLv2. 4 * 5 * Original: Michael Neuling 4/12/2013 6 * Edited: Rashmica Gupta 4/12/2015 7 * 8 * See if the altivec state is leaked out of an aborted transaction due to 9 * kernel vmx copy loops. 10 * 11 * When the transaction aborts, VSR values should rollback to the values 12 * they held before the transaction commenced. Using VSRs while transaction 13 * is suspended should not affect the checkpointed values. 14 * 15 * (1) write A to a VSR 16 * (2) start transaction 17 * (3) suspend transaction 18 * (4) change the VSR to B 19 * (5) trigger kernel vmx copy loop 20 * (6) abort transaction 21 * (7) check that the VSR value is A 22 */ 23 24 #include <inttypes.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <unistd.h> 28 #include <sys/mman.h> 29 #include <string.h> 30 #include <assert.h> 31 32 #include "tm.h" 33 #include "utils.h" 34 35 int test_vmxcopy() 36 { 37 long double vecin = 1.3; 38 long double vecout; 39 unsigned long pgsize = getpagesize(); 40 int i; 41 int fd; 42 int size = pgsize*16; 43 char tmpfile[] = "/tmp/page_faultXXXXXX"; 44 char buf[pgsize]; 45 char *a; 46 uint64_t aborted = 0; 47 48 SKIP_IF(!have_htm()); 49 50 fd = mkstemp(tmpfile); 51 assert(fd >= 0); 52 53 memset(buf, 0, pgsize); 54 for (i = 0; i < size; i += pgsize) 55 assert(write(fd, buf, pgsize) == pgsize); 56 57 unlink(tmpfile); 58 59 a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 60 assert(a != MAP_FAILED); 61 62 asm __volatile__( 63 "lxvd2x 40,0,%[vecinptr];" /* set 40 to initial value*/ 64 "tbegin.;" 65 "beq 3f;" 66 "tsuspend.;" 67 "xxlxor 40,40,40;" /* set 40 to 0 */ 68 "std 5, 0(%[map]);" /* cause kernel vmx copy page */ 69 "tabort. 0;" 70 "tresume.;" 71 "tend.;" 72 "li %[res], 0;" 73 "b 5f;" 74 75 /* Abort handler */ 76 "3:;" 77 "li %[res], 1;" 78 79 "5:;" 80 "stxvd2x 40,0,%[vecoutptr];" 81 : [res]"=r"(aborted) 82 : [vecinptr]"r"(&vecin), 83 [vecoutptr]"r"(&vecout), 84 [map]"r"(a) 85 : "memory", "r0", "r3", "r4", "r5", "r6", "r7"); 86 87 if (aborted && (vecin != vecout)){ 88 printf("FAILED: vector state leaked on abort %f != %f\n", 89 (double)vecin, (double)vecout); 90 return 1; 91 } 92 93 munmap(a, size); 94 95 close(fd); 96 97 return 0; 98 } 99 100 int main(void) 101 { 102 return test_harness(test_vmxcopy, "tm_vmxcopy"); 103 } 104