1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2015, Michael Neuling, IBM Corp.
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
test_vmxcopy()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 SKIP_IF(htm_is_synthetic());
50 SKIP_IF(!is_ppc64le());
51
52 fd = mkstemp(tmpfile);
53 assert(fd >= 0);
54
55 memset(buf, 0, pgsize);
56 for (i = 0; i < size; i += pgsize)
57 assert(write(fd, buf, pgsize) == pgsize);
58
59 unlink(tmpfile);
60
61 a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
62 assert(a != MAP_FAILED);
63
64 asm __volatile__(
65 "lxvd2x 40,0,%[vecinptr];" /* set 40 to initial value*/
66 "tbegin.;"
67 "beq 3f;"
68 "tsuspend.;"
69 "xxlxor 40,40,40;" /* set 40 to 0 */
70 "std 5, 0(%[map]);" /* cause kernel vmx copy page */
71 "tabort. 0;"
72 "tresume.;"
73 "tend.;"
74 "li %[res], 0;"
75 "b 5f;"
76
77 /* Abort handler */
78 "3:;"
79 "li %[res], 1;"
80
81 "5:;"
82 "stxvd2x 40,0,%[vecoutptr];"
83 : [res]"=&r"(aborted)
84 : [vecinptr]"r"(&vecin),
85 [vecoutptr]"r"(&vecout),
86 [map]"r"(a)
87 : "memory", "r0", "r3", "r4", "r5", "r6", "r7");
88
89 if (aborted && (vecin != vecout)){
90 printf("FAILED: vector state leaked on abort %f != %f\n",
91 (double)vecin, (double)vecout);
92 return 1;
93 }
94
95 munmap(a, size);
96
97 close(fd);
98
99 return 0;
100 }
101
main(void)102 int main(void)
103 {
104 return test_harness(test_vmxcopy, "tm_vmxcopy");
105 }
106