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