1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Ptrace test for GPR/FPR registers in TM Suspend context
4  *
5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
6  */
7 #include "ptrace.h"
8 #include "ptrace-gpr.h"
9 #include "tm.h"
10 
11 /* Tracer and Tracee Shared Data */
12 int shm_id;
13 int *cptr, *pptr;
14 
15 double a = FPR_1;
16 double b = FPR_2;
17 double c = FPR_3;
18 double d = FPR_4;
19 
20 __attribute__((used)) void wait_parent(void)
21 {
22 	cptr[2] = 1;
23 	while (!cptr[1])
24 		asm volatile("" : : : "memory");
25 }
26 
27 void tm_spd_gpr(void)
28 {
29 	unsigned long gpr_buf[18];
30 	unsigned long result, texasr;
31 	double fpr_buf[32];
32 
33 	cptr = (int *)shmat(shm_id, NULL, 0);
34 
35 trans:
36 	cptr[2] = 0;
37 	asm __volatile__(
38 		ASM_LOAD_GPR_IMMED(gpr_1)
39 		ASM_LOAD_FPR(flt_1)
40 
41 		"1: ;"
42 		"tbegin.;"
43 		"beq 2f;"
44 
45 		ASM_LOAD_GPR_IMMED(gpr_2)
46 		"tsuspend.;"
47 		ASM_LOAD_GPR_IMMED(gpr_4)
48 		ASM_LOAD_FPR(flt_4)
49 
50 		"bl wait_parent;"
51 		"tresume.;"
52 		"tend.;"
53 		"li 0, 0;"
54 		"ori %[res], 0, 0;"
55 		"b 3f;"
56 
57 		/* Transaction abort handler */
58 		"2: ;"
59 		"li 0, 1;"
60 		"ori %[res], 0, 0;"
61 		"mfspr %[texasr], %[sprn_texasr];"
62 
63 		"3: ;"
64 		: [res] "=r" (result), [texasr] "=r" (texasr)
65 		: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
66 		[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
67 		[flt_4] "b" (&d)
68 		: "memory", "r0", "r5", "r6", "r7",
69 		"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
70 		"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
71 		"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
72 		);
73 
74 	if (result) {
75 		if (!cptr[0])
76 			goto trans;
77 
78 		shmdt((void *)cptr);
79 		store_gpr(gpr_buf);
80 		store_fpr(fpr_buf);
81 
82 		if (validate_gpr(gpr_buf, GPR_3))
83 			exit(1);
84 
85 		if (validate_fpr_double(fpr_buf, c))
86 			exit(1);
87 		exit(0);
88 	}
89 	shmdt((void *)cptr);
90 	exit(1);
91 }
92 
93 int trace_tm_spd_gpr(pid_t child)
94 {
95 	unsigned long gpr[18];
96 	__u64 fpr[32];
97 
98 	FAIL_IF(start_trace(child));
99 	FAIL_IF(show_gpr(child, gpr));
100 	FAIL_IF(validate_gpr(gpr, GPR_4));
101 	FAIL_IF(show_fpr(child, fpr));
102 	FAIL_IF(validate_fpr(fpr, FPR_4_REP));
103 	FAIL_IF(show_ckpt_fpr(child, fpr));
104 	FAIL_IF(validate_fpr(fpr, FPR_1_REP));
105 	FAIL_IF(show_ckpt_gpr(child, gpr));
106 	FAIL_IF(validate_gpr(gpr, GPR_1));
107 	FAIL_IF(write_ckpt_gpr(child, GPR_3));
108 	FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
109 
110 	pptr[0] = 1;
111 	pptr[1] = 1;
112 	FAIL_IF(stop_trace(child));
113 	return TEST_PASS;
114 }
115 
116 int ptrace_tm_spd_gpr(void)
117 {
118 	pid_t pid;
119 	int ret, status;
120 
121 	SKIP_IF(!have_htm());
122 	SKIP_IF(htm_is_synthetic());
123 	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
124 	pid = fork();
125 	if (pid < 0) {
126 		perror("fork() failed");
127 		return TEST_FAIL;
128 	}
129 
130 	if (pid == 0)
131 		tm_spd_gpr();
132 
133 	if (pid) {
134 		pptr = (int *)shmat(shm_id, NULL, 0);
135 		pptr[0] = 0;
136 		pptr[1] = 0;
137 
138 		while (!pptr[2])
139 			asm volatile("" : : : "memory");
140 		ret = trace_tm_spd_gpr(pid);
141 		if (ret) {
142 			kill(pid, SIGTERM);
143 			shmdt((void *)pptr);
144 			shmctl(shm_id, IPC_RMID, NULL);
145 			return TEST_FAIL;
146 		}
147 
148 		shmdt((void *)pptr);
149 
150 		ret = wait(&status);
151 		shmctl(shm_id, IPC_RMID, NULL);
152 		if (ret != pid) {
153 			printf("Child's exit status not captured\n");
154 			return TEST_FAIL;
155 		}
156 
157 		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
158 			TEST_PASS;
159 	}
160 	return TEST_PASS;
161 }
162 
163 int main(int argc, char *argv[])
164 {
165 	return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
166 }
167