1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Ptrace test for TAR, PPR, DSCR registers
4 *
5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
6 */
7 #include "ptrace.h"
8 #include "ptrace-tar.h"
9
10 /* Tracer and Tracee Shared Data */
11 int shm_id;
12 int *cptr;
13 int *pptr;
14
15 void tar(void)
16 {
17 unsigned long reg[3];
18 int ret;
19
20 cptr = (int *)shmat(shm_id, NULL, 0);
21 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
22 user_write, TAR_1, PPR_1, DSCR_1);
23
24 mtspr(SPRN_TAR, TAR_1);
25 mtspr(SPRN_PPR, PPR_1);
26 mtspr(SPRN_DSCR, DSCR_1);
27
28 cptr[2] = 1;
29
30 /* Wait on parent */
31 while (!cptr[0])
32 asm volatile("" : : : "memory");
33
34 reg[0] = mfspr(SPRN_TAR);
35 reg[1] = mfspr(SPRN_PPR);
36 reg[2] = mfspr(SPRN_DSCR);
37
38 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
39 user_read, reg[0], reg[1], reg[2]);
40
41 /* Unblock the parent now */
42 cptr[1] = 1;
43 shmdt((int *)cptr);
44
45 ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
46 if (ret)
47 exit(1);
48 exit(0);
49 }
50
51 int trace_tar(pid_t child)
52 {
53 unsigned long reg[3];
54
55 FAIL_IF(start_trace(child));
56 FAIL_IF(show_tar_registers(child, reg));
57 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
58 ptrace_read_running, reg[0], reg[1], reg[2]);
59
60 FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
61 FAIL_IF(stop_trace(child));
62 return TEST_PASS;
63 }
64
65 int trace_tar_write(pid_t child)
66 {
67 FAIL_IF(start_trace(child));
68 FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
69 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
70 ptrace_write_running, TAR_2, PPR_2, DSCR_2);
71
72 FAIL_IF(stop_trace(child));
73 return TEST_PASS;
74 }
75
76 int ptrace_tar(void)
77 {
78 pid_t pid;
79 int ret, status;
80
81 // TAR was added in v2.07
82 SKIP_IF_MSG(!have_hwcap2(PPC_FEATURE2_ARCH_2_07), "TAR requires ISA 2.07 compatible hardware");
83
84 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
85 pid = fork();
86 if (pid < 0) {
87 perror("fork() failed");
88 return TEST_FAIL;
89 }
90
91 if (pid == 0)
92 tar();
93
94 if (pid) {
95 pptr = (int *)shmat(shm_id, NULL, 0);
96 pptr[0] = 0;
97 pptr[1] = 0;
98
99 while (!pptr[2])
100 asm volatile("" : : : "memory");
101 ret = trace_tar(pid);
102 if (ret)
103 return ret;
104
105 ret = trace_tar_write(pid);
106 if (ret)
107 return ret;
108
109 /* Unblock the child now */
110 pptr[0] = 1;
111
112 /* Wait on child */
113 while (!pptr[1])
114 asm volatile("" : : : "memory");
115
116 shmdt((int *)pptr);
117
118 ret = wait(&status);
119 shmctl(shm_id, IPC_RMID, NULL);
120 if (ret != pid) {
121 printf("Child's exit status not captured\n");
122 return TEST_PASS;
123 }
124
125 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
126 TEST_PASS;
127 }
128 return TEST_PASS;
129 }
130
131 int main(int argc, char *argv[])
132 {
133 return test_harness(ptrace_tar, "ptrace_tar");
134 }
135
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