1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Ptrace test for VMX/VSX registers
4  *
5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
6  */
7 #include "ptrace.h"
8 #include "ptrace-vsx.h"
9 
10 /* Tracer and Tracee Shared Data */
11 int shm_id;
12 int *cptr, *pptr;
13 
14 unsigned long fp_load[VEC_MAX];
15 unsigned long fp_load_new[VEC_MAX];
16 unsigned long fp_store[VEC_MAX];
17 
vsx(void)18 void vsx(void)
19 {
20 	int ret;
21 
22 	cptr = (int *)shmat(shm_id, NULL, 0);
23 	loadvsx(fp_load, 0);
24 	cptr[1] = 1;
25 
26 	while (!cptr[0])
27 		asm volatile("" : : : "memory");
28 	shmdt((void *) cptr);
29 
30 	storevsx(fp_store, 0);
31 	ret = compare_vsx_vmx(fp_store, fp_load_new);
32 	if (ret)
33 		exit(1);
34 	exit(0);
35 }
36 
trace_vsx(pid_t child)37 int trace_vsx(pid_t child)
38 {
39 	unsigned long vsx[VSX_MAX];
40 	unsigned long vmx[VMX_MAX + 2][2];
41 
42 	FAIL_IF(start_trace(child));
43 	FAIL_IF(show_vsx(child, vsx));
44 	FAIL_IF(validate_vsx(vsx, fp_load));
45 	FAIL_IF(show_vmx(child, vmx));
46 	FAIL_IF(validate_vmx(vmx, fp_load));
47 
48 	memset(vsx, 0, sizeof(vsx));
49 	memset(vmx, 0, sizeof(vmx));
50 	load_vsx_vmx(fp_load_new, vsx, vmx);
51 
52 	FAIL_IF(write_vsx(child, vsx));
53 	FAIL_IF(write_vmx(child, vmx));
54 	FAIL_IF(stop_trace(child));
55 
56 	return TEST_PASS;
57 }
58 
ptrace_vsx(void)59 int ptrace_vsx(void)
60 {
61 	pid_t pid;
62 	int ret, status, i;
63 
64 	SKIP_IF_MSG(!have_hwcap(PPC_FEATURE_HAS_VSX), "Don't have VSX");
65 
66 	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
67 
68 	for (i = 0; i < VEC_MAX; i++)
69 		fp_load[i] = i + rand();
70 
71 	for (i = 0; i < VEC_MAX; i++)
72 		fp_load_new[i] = i + 2 * rand();
73 
74 	pid = fork();
75 	if (pid < 0) {
76 		perror("fork() failed");
77 		return TEST_FAIL;
78 	}
79 
80 	if (pid == 0)
81 		vsx();
82 
83 	if (pid) {
84 		pptr = (int *)shmat(shm_id, NULL, 0);
85 		while (!pptr[1])
86 			asm volatile("" : : : "memory");
87 
88 		ret = trace_vsx(pid);
89 		if (ret) {
90 			kill(pid, SIGTERM);
91 			shmdt((void *)pptr);
92 			shmctl(shm_id, IPC_RMID, NULL);
93 			return TEST_FAIL;
94 		}
95 
96 		pptr[0] = 1;
97 		shmdt((void *)pptr);
98 
99 		ret = wait(&status);
100 		shmctl(shm_id, IPC_RMID, NULL);
101 		if (ret != pid) {
102 			printf("Child's exit status not captured\n");
103 			return TEST_FAIL;
104 		}
105 
106 		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
107 			TEST_PASS;
108 	}
109 	return TEST_PASS;
110 }
111 
main(int argc,char * argv[])112 int main(int argc, char *argv[])
113 {
114 	return test_harness(ptrace_vsx, "ptrace_vsx");
115 }
116