1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Ptrace test for GPR/FPR registers in TM 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 unsigned long *cptr, *pptr;
14
15 double a = FPR_1;
16 double b = FPR_2;
17 double c = FPR_3;
18
19 void tm_gpr(void)
20 {
21 unsigned long gpr_buf[18];
22 unsigned long result, texasr;
23 double fpr_buf[32];
24
25 printf("Starting the child\n");
26 cptr = (unsigned long *)shmat(shm_id, NULL, 0);
27
28 trans:
29 cptr[1] = 0;
30 asm __volatile__(
31 ASM_LOAD_GPR_IMMED(gpr_1)
32 ASM_LOAD_FPR(flt_1)
33 "1: ;"
34 "tbegin.;"
35 "beq 2f;"
36 ASM_LOAD_GPR_IMMED(gpr_2)
37 ASM_LOAD_FPR(flt_2)
38 "tsuspend.;"
39 "li 7, 1;"
40 "stw 7, 0(%[cptr1]);"
41 "tresume.;"
42 "b .;"
43
44 "tend.;"
45 "li 0, 0;"
46 "ori %[res], 0, 0;"
47 "b 3f;"
48
49 /* Transaction abort handler */
50 "2: ;"
51 "li 0, 1;"
52 "ori %[res], 0, 0;"
53 "mfspr %[texasr], %[sprn_texasr];"
54
55 "3: ;"
56 : [res] "=r" (result), [texasr] "=r" (texasr)
57 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
58 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
59 [flt_2] "b" (&b), [cptr1] "b" (&cptr[1])
60 : "memory", "r0", "r7", "r8", "r9", "r10",
61 "r11", "r12", "r13", "r14", "r15", "r16",
62 "r17", "r18", "r19", "r20", "r21", "r22",
63 "r23", "r24", "r25", "r26", "r27", "r28",
64 "r29", "r30", "r31"
65 );
66
67 if (result) {
68 if (!cptr[0])
69 goto trans;
70
71 shmdt((void *)cptr);
72 store_gpr(gpr_buf);
73 store_fpr(fpr_buf);
74
75 if (validate_gpr(gpr_buf, GPR_3))
76 exit(1);
77
78 if (validate_fpr_double(fpr_buf, c))
79 exit(1);
80
81 exit(0);
82 }
83 shmdt((void *)cptr);
84 exit(1);
85 }
86
87 int trace_tm_gpr(pid_t child)
88 {
89 unsigned long gpr[18];
90 __u64 fpr[32];
91
92 FAIL_IF(start_trace(child));
93 FAIL_IF(show_gpr(child, gpr));
94 FAIL_IF(validate_gpr(gpr, GPR_2));
95 FAIL_IF(show_fpr(child, fpr));
96 FAIL_IF(validate_fpr(fpr, FPR_2_REP));
97 FAIL_IF(show_ckpt_fpr(child, fpr));
98 FAIL_IF(validate_fpr(fpr, FPR_1_REP));
99 FAIL_IF(show_ckpt_gpr(child, gpr));
100 FAIL_IF(validate_gpr(gpr, GPR_1));
101 FAIL_IF(write_ckpt_gpr(child, GPR_3));
102 FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
103
104 pptr[0] = 1;
105 FAIL_IF(stop_trace(child));
106
107 return TEST_PASS;
108 }
109
110 int ptrace_tm_gpr(void)
111 {
112 pid_t pid;
113 int ret, status;
114
115 SKIP_IF_MSG(!have_htm(), "Don't have transactional memory");
116 SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic");
117 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
118 pid = fork();
119 if (pid < 0) {
120 perror("fork() failed");
121 return TEST_FAIL;
122 }
123 if (pid == 0)
124 tm_gpr();
125
126 if (pid) {
127 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
128
129 while (!pptr[1])
130 asm volatile("" : : : "memory");
131 ret = trace_tm_gpr(pid);
132 if (ret) {
133 kill(pid, SIGTERM);
134 return TEST_FAIL;
135 }
136
137 shmdt((void *)pptr);
138
139 ret = wait(&status);
140 shmctl(shm_id, IPC_RMID, NULL);
141 if (ret != pid) {
142 printf("Child's exit status not captured\n");
143 return TEST_FAIL;
144 }
145
146 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
147 TEST_PASS;
148 }
149 return TEST_PASS;
150 }
151
152 int main(int argc, char *argv[])
153 {
154 return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
155 }
156
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