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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * POWER Data Stream Control Register (DSCR) fork exec test | |
4 | * | |
5 | * This testcase modifies the DSCR using mtspr, forks & execs and | |
6 | * verifies that the child is using the changed DSCR using mfspr. | |
7 | * | |
8 | * When using the privilege state SPR, the instructions such as | |
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9 | * mfspr or mtspr are privileged and the kernel emulates them |
10 | * for us. Instructions using problem state SPR can be executed | |
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11 | * directly without any emulation if the HW supports them. Else |
12 | * they also get emulated by the kernel. | |
13 | * | |
14 | * Copyright 2012, Anton Blanchard, IBM Corporation. | |
15 | * Copyright 2015, Anshuman Khandual, IBM Corporation. | |
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16 | */ |
17 | #include "dscr.h" | |
18 | ||
09a61e89 | 19 | static char *prog; |
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20 | |
21 | static void do_exec(unsigned long parent_dscr) | |
22 | { | |
23 | unsigned long cur_dscr, cur_dscr_usr; | |
24 | ||
25 | cur_dscr = get_dscr(); | |
26 | cur_dscr_usr = get_dscr_usr(); | |
27 | ||
28 | if (cur_dscr != parent_dscr) { | |
29 | fprintf(stderr, "Parent DSCR %ld was not inherited " | |
30 | "over exec (kernel value)\n", parent_dscr); | |
31 | exit(1); | |
32 | } | |
33 | ||
34 | if (cur_dscr_usr != parent_dscr) { | |
35 | fprintf(stderr, "Parent DSCR %ld was not inherited " | |
36 | "over exec (user value)\n", parent_dscr); | |
37 | exit(1); | |
38 | } | |
39 | exit(0); | |
40 | } | |
41 | ||
42 | int dscr_inherit_exec(void) | |
43 | { | |
44 | unsigned long i, dscr = 0; | |
45 | pid_t pid; | |
46 | ||
47 | for (i = 0; i < COUNT; i++) { | |
48 | dscr++; | |
49 | if (dscr > DSCR_MAX) | |
50 | dscr = 0; | |
51 | ||
52 | if (dscr == get_default_dscr()) | |
53 | continue; | |
54 | ||
55 | if (i % 2 == 0) | |
56 | set_dscr_usr(dscr); | |
57 | else | |
58 | set_dscr(dscr); | |
59 | ||
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60 | pid = fork(); |
61 | if (pid == -1) { | |
62 | perror("fork() failed"); | |
63 | exit(1); | |
64 | } else if (pid) { | |
65 | int status; | |
66 | ||
67 | if (waitpid(pid, &status, 0) == -1) { | |
68 | perror("waitpid() failed"); | |
69 | exit(1); | |
70 | } | |
71 | ||
72 | if (!WIFEXITED(status)) { | |
73 | fprintf(stderr, "Child didn't exit cleanly\n"); | |
74 | exit(1); | |
75 | } | |
76 | ||
77 | if (WEXITSTATUS(status) != 0) { | |
78 | fprintf(stderr, "Child didn't exit cleanly\n"); | |
79 | return 1; | |
80 | } | |
81 | } else { | |
82 | char dscr_str[16]; | |
83 | ||
84 | sprintf(dscr_str, "%ld", dscr); | |
85 | execlp(prog, prog, "exec", dscr_str, NULL); | |
86 | exit(1); | |
87 | } | |
88 | } | |
89 | return 0; | |
90 | } | |
91 | ||
92 | int main(int argc, char *argv[]) | |
93 | { | |
94 | if (argc == 3 && !strcmp(argv[1], "exec")) { | |
95 | unsigned long parent_dscr; | |
96 | ||
97 | parent_dscr = atoi(argv[2]); | |
98 | do_exec(parent_dscr); | |
99 | } else if (argc != 1) { | |
100 | fprintf(stderr, "Usage: %s\n", argv[0]); | |
101 | exit(1); | |
102 | } | |
103 | ||
09a61e89 | 104 | prog = argv[0]; |
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105 | return test_harness(dscr_inherit_exec, "dscr_inherit_exec_test"); |
106 | } |