b250c90898
GCC raises the following warning: warning: 'status' may be used uninitialized The warning comes from the fact, that the signature of waitpid() is unknown and therefore the initialization of GCC cannot be guessed. Let's add the relevant header to address this warning. Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20231123185821.2272504-4-christoph.muellner@vrull.eu Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
#include <linux/wait.h>
|
|
|
|
#define THIS_PROGRAM "./vstate_exec_nolibc"
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int rc, pid, status, test_inherit = 0;
|
|
long ctrl, ctrl_c;
|
|
char *exec_argv[2], *exec_envp[2];
|
|
|
|
if (argc > 1)
|
|
test_inherit = 1;
|
|
|
|
ctrl = my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL);
|
|
if (ctrl < 0) {
|
|
puts("PR_RISCV_V_GET_CONTROL is not supported\n");
|
|
return ctrl;
|
|
}
|
|
|
|
if (test_inherit) {
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
puts("fork failed\n");
|
|
exit(-1);
|
|
}
|
|
|
|
/* child */
|
|
if (!pid) {
|
|
exec_argv[0] = THIS_PROGRAM;
|
|
exec_argv[1] = NULL;
|
|
exec_envp[0] = NULL;
|
|
exec_envp[1] = NULL;
|
|
/* launch the program again to check inherit */
|
|
rc = execve(THIS_PROGRAM, exec_argv, exec_envp);
|
|
if (rc) {
|
|
puts("child execve failed\n");
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
} else {
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
puts("fork failed\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!pid) {
|
|
rc = my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL);
|
|
if (rc != ctrl) {
|
|
puts("child's vstate_ctrl not equal to parent's\n");
|
|
exit(-1);
|
|
}
|
|
asm volatile (".option push\n\t"
|
|
".option arch, +v\n\t"
|
|
"vsetvli x0, x0, e32, m8, ta, ma\n\t"
|
|
".option pop\n\t"
|
|
);
|
|
exit(ctrl);
|
|
}
|
|
}
|
|
|
|
rc = waitpid(-1, &status, 0);
|
|
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == -1) {
|
|
puts("child exited abnormally\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if (WIFSIGNALED(status)) {
|
|
if (WTERMSIG(status) != SIGILL) {
|
|
puts("child was terminated by unexpected signal\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if ((ctrl & PR_RISCV_V_VSTATE_CTRL_CUR_MASK) != PR_RISCV_V_VSTATE_CTRL_OFF) {
|
|
puts("child signaled by illegal V access but vstate_ctrl is not off\n");
|
|
exit(-1);
|
|
}
|
|
|
|
/* child terminated, and its vstate_ctrl is off */
|
|
exit(ctrl);
|
|
}
|
|
|
|
ctrl_c = WEXITSTATUS(status);
|
|
if (test_inherit) {
|
|
if (ctrl & PR_RISCV_V_VSTATE_CTRL_INHERIT) {
|
|
if (!(ctrl_c & PR_RISCV_V_VSTATE_CTRL_INHERIT)) {
|
|
puts("parent has inherit bit, but child has not\n");
|
|
exit(-1);
|
|
}
|
|
}
|
|
rc = (ctrl & PR_RISCV_V_VSTATE_CTRL_NEXT_MASK) >> 2;
|
|
if (rc != PR_RISCV_V_VSTATE_CTRL_DEFAULT) {
|
|
if (rc != (ctrl_c & PR_RISCV_V_VSTATE_CTRL_CUR_MASK)) {
|
|
puts("parent's next setting does not equal to child's\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!(ctrl & PR_RISCV_V_VSTATE_CTRL_INHERIT)) {
|
|
if ((ctrl_c & PR_RISCV_V_VSTATE_CTRL_NEXT_MASK) !=
|
|
PR_RISCV_V_VSTATE_CTRL_DEFAULT) {
|
|
puts("must clear child's next vstate_ctrl if !inherit\n");
|
|
exit(-1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ctrl;
|
|
}
|