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6f844261 AK |
1 | /* |
2 | * POWER Data Stream Control Register (DSCR) fork exec test | |
3 | * | |
4 | * This testcase modifies the DSCR using mtspr, forks & execs and | |
5 | * verifies that the child is using the changed DSCR using mfspr. | |
6 | * | |
7 | * When using the privilege state SPR, the instructions such as | |
8 | * mfspr or mtspr are priviledged and the kernel emulates them | |
9 | * for us. Instructions using problem state SPR can be exuecuted | |
10 | * directly without any emulation if the HW supports them. Else | |
11 | * they also get emulated by the kernel. | |
12 | * | |
13 | * Copyright 2012, Anton Blanchard, IBM Corporation. | |
14 | * Copyright 2015, Anshuman Khandual, IBM Corporation. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify it | |
17 | * under the terms of the GNU General Public License version 2 as published | |
18 | * by the Free Software Foundation. | |
19 | */ | |
20 | #include "dscr.h" | |
21 | ||
22 | static char prog[LEN_MAX]; | |
23 | ||
24 | static void do_exec(unsigned long parent_dscr) | |
25 | { | |
26 | unsigned long cur_dscr, cur_dscr_usr; | |
27 | ||
28 | cur_dscr = get_dscr(); | |
29 | cur_dscr_usr = get_dscr_usr(); | |
30 | ||
31 | if (cur_dscr != parent_dscr) { | |
32 | fprintf(stderr, "Parent DSCR %ld was not inherited " | |
33 | "over exec (kernel value)\n", parent_dscr); | |
34 | exit(1); | |
35 | } | |
36 | ||
37 | if (cur_dscr_usr != parent_dscr) { | |
38 | fprintf(stderr, "Parent DSCR %ld was not inherited " | |
39 | "over exec (user value)\n", parent_dscr); | |
40 | exit(1); | |
41 | } | |
42 | exit(0); | |
43 | } | |
44 | ||
45 | int dscr_inherit_exec(void) | |
46 | { | |
47 | unsigned long i, dscr = 0; | |
48 | pid_t pid; | |
49 | ||
50 | for (i = 0; i < COUNT; i++) { | |
51 | dscr++; | |
52 | if (dscr > DSCR_MAX) | |
53 | dscr = 0; | |
54 | ||
55 | if (dscr == get_default_dscr()) | |
56 | continue; | |
57 | ||
58 | if (i % 2 == 0) | |
59 | set_dscr_usr(dscr); | |
60 | else | |
61 | set_dscr(dscr); | |
62 | ||
6f844261 AK |
63 | pid = fork(); |
64 | if (pid == -1) { | |
65 | perror("fork() failed"); | |
66 | exit(1); | |
67 | } else if (pid) { | |
68 | int status; | |
69 | ||
70 | if (waitpid(pid, &status, 0) == -1) { | |
71 | perror("waitpid() failed"); | |
72 | exit(1); | |
73 | } | |
74 | ||
75 | if (!WIFEXITED(status)) { | |
76 | fprintf(stderr, "Child didn't exit cleanly\n"); | |
77 | exit(1); | |
78 | } | |
79 | ||
80 | if (WEXITSTATUS(status) != 0) { | |
81 | fprintf(stderr, "Child didn't exit cleanly\n"); | |
82 | return 1; | |
83 | } | |
84 | } else { | |
85 | char dscr_str[16]; | |
86 | ||
87 | sprintf(dscr_str, "%ld", dscr); | |
88 | execlp(prog, prog, "exec", dscr_str, NULL); | |
89 | exit(1); | |
90 | } | |
91 | } | |
92 | return 0; | |
93 | } | |
94 | ||
95 | int main(int argc, char *argv[]) | |
96 | { | |
97 | if (argc == 3 && !strcmp(argv[1], "exec")) { | |
98 | unsigned long parent_dscr; | |
99 | ||
100 | parent_dscr = atoi(argv[2]); | |
101 | do_exec(parent_dscr); | |
102 | } else if (argc != 1) { | |
103 | fprintf(stderr, "Usage: %s\n", argv[0]); | |
104 | exit(1); | |
105 | } | |
106 | ||
107 | strncpy(prog, argv[0], strlen(argv[0])); | |
108 | return test_harness(dscr_inherit_exec, "dscr_inherit_exec_test"); | |
109 | } |