1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Ptrace test for VMX/VSX registers in the TM Suspend context
4  *
5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
6  */
7 #include "ptrace.h"
8 #include "tm.h"
9 #include "ptrace-vsx.h"
10 
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 unsigned long fp_load_ckpt[VEC_MAX];
18 unsigned long fp_load_ckpt_new[VEC_MAX];
19 
load_vsx(void)20 __attribute__((used)) void load_vsx(void)
21 {
22 	loadvsx(fp_load, 0);
23 }
24 
load_vsx_new(void)25 __attribute__((used)) void load_vsx_new(void)
26 {
27 	loadvsx(fp_load_new, 0);
28 }
29 
load_vsx_ckpt(void)30 __attribute__((used)) void load_vsx_ckpt(void)
31 {
32 	loadvsx(fp_load_ckpt, 0);
33 }
34 
wait_parent(void)35 __attribute__((used)) void wait_parent(void)
36 {
37 	cptr[2] = 1;
38 	while (!cptr[1])
39 		asm volatile("" : : : "memory");
40 }
41 
tm_spd_vsx(void)42 void tm_spd_vsx(void)
43 {
44 	unsigned long result, texasr;
45 	int ret;
46 
47 	cptr = (int *)shmat(shm_id, NULL, 0);
48 
49 trans:
50 	cptr[2] = 0;
51 	asm __volatile__(
52 		"bl load_vsx_ckpt;"
53 
54 		"1: ;"
55 		"tbegin.;"
56 		"beq 2f;"
57 
58 		"bl load_vsx_new;"
59 		"tsuspend.;"
60 		"bl load_vsx;"
61 		"bl wait_parent;"
62 		"tresume.;"
63 
64 		"tend.;"
65 		"li 0, 0;"
66 		"ori %[res], 0, 0;"
67 		"b 3f;"
68 
69 		"2: ;"
70 		"li 0, 1;"
71 		"ori %[res], 0, 0;"
72 		"mfspr %[texasr], %[sprn_texasr];"
73 
74 		"3: ;"
75 		: [res] "=r" (result), [texasr] "=r" (texasr)
76 		: [sprn_texasr] "i"  (SPRN_TEXASR)
77 		: "memory", "r0", "r3", "r4",
78 		  "r7", "r8", "r9", "r10", "r11", "lr"
79 		);
80 
81 	if (result) {
82 		if (!cptr[0])
83 			goto trans;
84 		shmdt((void *)cptr);
85 
86 		storevsx(fp_store, 0);
87 		ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
88 		if (ret)
89 			exit(1);
90 		exit(0);
91 	}
92 	shmdt((void *)cptr);
93 	exit(1);
94 }
95 
trace_tm_spd_vsx(pid_t child)96 int trace_tm_spd_vsx(pid_t child)
97 {
98 	unsigned long vsx[VSX_MAX];
99 	unsigned long vmx[VMX_MAX + 2][2];
100 
101 	FAIL_IF(start_trace(child));
102 	FAIL_IF(show_vsx(child, vsx));
103 	FAIL_IF(validate_vsx(vsx, fp_load));
104 	FAIL_IF(show_vmx(child, vmx));
105 	FAIL_IF(validate_vmx(vmx, fp_load));
106 	FAIL_IF(show_vsx_ckpt(child, vsx));
107 	FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
108 	FAIL_IF(show_vmx_ckpt(child, vmx));
109 	FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
110 
111 	memset(vsx, 0, sizeof(vsx));
112 	memset(vmx, 0, sizeof(vmx));
113 
114 	load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
115 
116 	FAIL_IF(write_vsx_ckpt(child, vsx));
117 	FAIL_IF(write_vmx_ckpt(child, vmx));
118 
119 	pptr[0] = 1;
120 	pptr[1] = 1;
121 	FAIL_IF(stop_trace(child));
122 
123 	return TEST_PASS;
124 }
125 
ptrace_tm_spd_vsx(void)126 int ptrace_tm_spd_vsx(void)
127 {
128 	pid_t pid;
129 	int ret, status, i;
130 
131 	SKIP_IF_MSG(!have_htm(), "Don't have transactional memory");
132 	SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic");
133 	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
134 
135 	for (i = 0; i < 128; i++) {
136 		fp_load[i] = 1 + rand();
137 		fp_load_new[i] = 1 + 2 * rand();
138 		fp_load_ckpt[i] = 1 + 3 * rand();
139 		fp_load_ckpt_new[i] = 1 + 4 * rand();
140 	}
141 
142 	pid = fork();
143 	if (pid < 0) {
144 		perror("fork() failed");
145 		return TEST_FAIL;
146 	}
147 
148 	if (pid == 0)
149 		tm_spd_vsx();
150 
151 	if (pid) {
152 		pptr = (int *)shmat(shm_id, NULL, 0);
153 		while (!pptr[2])
154 			asm volatile("" : : : "memory");
155 
156 		ret = trace_tm_spd_vsx(pid);
157 		if (ret) {
158 			kill(pid, SIGKILL);
159 			shmdt((void *)pptr);
160 			shmctl(shm_id, IPC_RMID, NULL);
161 			return TEST_FAIL;
162 		}
163 
164 		shmdt((void *)pptr);
165 		ret = wait(&status);
166 		shmctl(shm_id, IPC_RMID, NULL);
167 		if (ret != pid) {
168 			printf("Child's exit status not captured\n");
169 			return TEST_FAIL;
170 		}
171 
172 		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
173 			TEST_PASS;
174 	}
175 	return TEST_PASS;
176 }
177 
main(int argc,char * argv[])178 int main(int argc, char *argv[])
179 {
180 	return test_harness(ptrace_tm_spd_vsx, "ptrace_tm_spd_vsx");
181 }
182