1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/wait.h>
4
5 #define THIS_PROGRAM "./vstate_exec_nolibc"
6
7 int main(int argc, char **argv)
8 {
9 int rc, pid, status, test_inherit = 0;
10 long ctrl, ctrl_c;
11 char *exec_argv[2], *exec_envp[2];
12
13 if (argc > 1)
14 test_inherit = 1;
15
16 ctrl = my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL);
17 if (ctrl < 0) {
18 puts("PR_RISCV_V_GET_CONTROL is not supported\n");
19 return ctrl;
20 }
21
22 if (test_inherit) {
23 pid = fork();
24 if (pid == -1) {
25 puts("fork failed\n");
26 exit(-1);
27 }
28
29 /* child */
30 if (!pid) {
31 exec_argv[0] = THIS_PROGRAM;
32 exec_argv[1] = NULL;
33 exec_envp[0] = NULL;
34 exec_envp[1] = NULL;
35 /* launch the program again to check inherit */
36 rc = execve(THIS_PROGRAM, exec_argv, exec_envp);
37 if (rc) {
38 puts("child execve failed\n");
39 exit(-1);
40 }
41 }
42
43 } else {
44 pid = fork();
45 if (pid == -1) {
46 puts("fork failed\n");
47 exit(-1);
48 }
49
50 if (!pid) {
51 rc = my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL);
52 if (rc != ctrl) {
53 puts("child's vstate_ctrl not equal to parent's\n");
54 exit(-1);
55 }
56 asm volatile (".option push\n\t"
57 ".option arch, +v\n\t"
58 "vsetvli x0, x0, e32, m8, ta, ma\n\t"
59 ".option pop\n\t"
60 );
61 exit(ctrl);
62 }
63 }
64
65 rc = waitpid(-1, &status, 0);
66
67 if (WIFEXITED(status) && WEXITSTATUS(status) == -1) {
68 puts("child exited abnormally\n");
69 exit(-1);
70 }
71
72 if (WIFSIGNALED(status)) {
73 if (WTERMSIG(status) != SIGILL) {
74 puts("child was terminated by unexpected signal\n");
75 exit(-1);
76 }
77
78 if ((ctrl & PR_RISCV_V_VSTATE_CTRL_CUR_MASK) != PR_RISCV_V_VSTATE_CTRL_OFF) {
79 puts("child signaled by illegal V access but vstate_ctrl is not off\n");
80 exit(-1);
81 }
82
83 /* child terminated, and its vstate_ctrl is off */
84 exit(ctrl);
85 }
86
87 ctrl_c = WEXITSTATUS(status);
88 if (test_inherit) {
89 if (ctrl & PR_RISCV_V_VSTATE_CTRL_INHERIT) {
90 if (!(ctrl_c & PR_RISCV_V_VSTATE_CTRL_INHERIT)) {
91 puts("parent has inherit bit, but child has not\n");
92 exit(-1);
93 }
94 }
95 rc = (ctrl & PR_RISCV_V_VSTATE_CTRL_NEXT_MASK) >> 2;
96 if (rc != PR_RISCV_V_VSTATE_CTRL_DEFAULT) {
97 if (rc != (ctrl_c & PR_RISCV_V_VSTATE_CTRL_CUR_MASK)) {
98 puts("parent's next setting does not equal to child's\n");
99 exit(-1);
100 }
101
102 if (!(ctrl & PR_RISCV_V_VSTATE_CTRL_INHERIT)) {
103 if ((ctrl_c & PR_RISCV_V_VSTATE_CTRL_NEXT_MASK) !=
104 PR_RISCV_V_VSTATE_CTRL_DEFAULT) {
105 puts("must clear child's next vstate_ctrl if !inherit\n");
106 exit(-1);
107 }
108 }
109 }
110 }
111 return ctrl;
112 }
113
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