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
35int 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
102int main(void)
103{
104	return test_harness(test_vmxcopy, "tm_vmxcopy");
105}
106