1 /*
2 * Ptrace test for TAR, PPR, DSCR registers
3 *
4 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #include "ptrace.h"
12 #include "ptrace-tar.h"
13
14 /* Tracer and Tracee Shared Data */
15 int shm_id;
16 int *cptr;
17 int *pptr;
18
tar(void)19 void tar(void)
20 {
21 unsigned long reg[3];
22 int ret;
23
24 cptr = (int *)shmat(shm_id, NULL, 0);
25 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
26 user_write, TAR_1, PPR_1, DSCR_1);
27
28 mtspr(SPRN_TAR, TAR_1);
29 mtspr(SPRN_PPR, PPR_1);
30 mtspr(SPRN_DSCR, DSCR_1);
31
32 cptr[2] = 1;
33
34 /* Wait on parent */
35 while (!cptr[0])
36 asm volatile("" : : : "memory");
37
38 reg[0] = mfspr(SPRN_TAR);
39 reg[1] = mfspr(SPRN_PPR);
40 reg[2] = mfspr(SPRN_DSCR);
41
42 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
43 user_read, reg[0], reg[1], reg[2]);
44
45 /* Unblock the parent now */
46 cptr[1] = 1;
47 shmdt((int *)cptr);
48
49 ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
50 if (ret)
51 exit(1);
52 exit(0);
53 }
54
trace_tar(pid_t child)55 int trace_tar(pid_t child)
56 {
57 unsigned long reg[3];
58
59 FAIL_IF(start_trace(child));
60 FAIL_IF(show_tar_registers(child, reg));
61 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
62 ptrace_read_running, reg[0], reg[1], reg[2]);
63
64 FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
65 FAIL_IF(stop_trace(child));
66 return TEST_PASS;
67 }
68
trace_tar_write(pid_t child)69 int trace_tar_write(pid_t child)
70 {
71 FAIL_IF(start_trace(child));
72 FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
73 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
74 ptrace_write_running, TAR_2, PPR_2, DSCR_2);
75
76 FAIL_IF(stop_trace(child));
77 return TEST_PASS;
78 }
79
ptrace_tar(void)80 int ptrace_tar(void)
81 {
82 pid_t pid;
83 int ret, status;
84
85 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
86 pid = fork();
87 if (pid < 0) {
88 perror("fork() failed");
89 return TEST_FAIL;
90 }
91
92 if (pid == 0)
93 tar();
94
95 if (pid) {
96 pptr = (int *)shmat(shm_id, NULL, 0);
97 pptr[0] = 0;
98 pptr[1] = 0;
99
100 while (!pptr[2])
101 asm volatile("" : : : "memory");
102 ret = trace_tar(pid);
103 if (ret)
104 return ret;
105
106 ret = trace_tar_write(pid);
107 if (ret)
108 return ret;
109
110 /* Unblock the child now */
111 pptr[0] = 1;
112
113 /* Wait on child */
114 while (!pptr[1])
115 asm volatile("" : : : "memory");
116
117 shmdt((int *)pptr);
118
119 ret = wait(&status);
120 shmctl(shm_id, IPC_RMID, NULL);
121 if (ret != pid) {
122 printf("Child's exit status not captured\n");
123 return TEST_PASS;
124 }
125
126 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
127 TEST_PASS;
128 }
129 return TEST_PASS;
130 }
131
main(int argc,char * argv[])132 int main(int argc, char *argv[])
133 {
134 return test_harness(ptrace_tar, "ptrace_tar");
135 }
136