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// SPDX-License-Identifier: GPL-2.0-only
#include <sys/prctl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include "../hwprobe/hwprobe.h"
#include "../../kselftest.h"
#define NEXT_PROGRAM "./vstate_exec_nolibc"
static int launch_test(int test_inherit)
{
char *exec_argv[3], *exec_envp[1];
int rc, pid, status;
pid = fork();
if (pid < 0) {
ksft_test_result_fail("fork failed %d", pid);
return -1;
}
if (!pid) {
exec_argv[0] = NEXT_PROGRAM;
exec_argv[1] = test_inherit != 0 ? "x" : NULL;
exec_argv[2] = NULL;
exec_envp[0] = NULL;
/* launch the program again to check inherit */
rc = execve(NEXT_PROGRAM, exec_argv, exec_envp);
if (rc) {
perror("execve");
ksft_test_result_fail("child execve failed %d\n", rc);
exit(-1);
}
}
rc = waitpid(-1, &status, 0);
if (rc < 0) {
ksft_test_result_fail("waitpid failed\n");
return -3;
}
if ((WIFEXITED(status) && WEXITSTATUS(status) == -1) ||
WIFSIGNALED(status)) {
ksft_test_result_fail("child exited abnormally\n");
return -4;
}
return WEXITSTATUS(status);
}
int test_and_compare_child(long provided, long expected, int inherit)
{
int rc;
rc = prctl(PR_RISCV_V_SET_CONTROL, provided);
if (rc != 0) {
ksft_test_result_fail("prctl with provided arg %lx failed with code %d\n",
provided, rc);
return -1;
}
rc = launch_test(inherit);
if (rc != expected) {
ksft_test_result_fail("Test failed, check %d != %d\n", rc,
expected);
return -2;
}
return 0;
}
#define PR_RISCV_V_VSTATE_CTRL_CUR_SHIFT 0
#define PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT 2
int main(void)
{
struct riscv_hwprobe pair;
long flag, expected;
long rc;
pair.key = RISCV_HWPROBE_KEY_IMA_EXT_0;
rc = riscv_hwprobe(&pair, 1, 0, NULL, 0);
if (rc < 0) {
ksft_test_result_fail("hwprobe() failed with %d\n", rc);
return -1;
}
if (pair.key != RISCV_HWPROBE_KEY_IMA_EXT_0) {
ksft_test_result_fail("hwprobe cannot probe RISCV_HWPROBE_KEY_IMA_EXT_0\n");
return -2;
}
if (!(pair.value & RISCV_HWPROBE_IMA_V)) {
rc = prctl(PR_RISCV_V_GET_CONTROL);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\n");
return -3;
}
rc = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\n");
return -4;
}
ksft_test_result_skip("Vector not supported\n");
return 0;
}
flag = PR_RISCV_V_VSTATE_CTRL_ON;
rc = prctl(PR_RISCV_V_SET_CONTROL, flag);
if (rc != 0) {
ksft_test_result_fail("Enabling V for current should always success\n");
return -5;
}
flag = PR_RISCV_V_VSTATE_CTRL_OFF;
rc = prctl(PR_RISCV_V_SET_CONTROL, flag);
if (rc != -1 || errno != EPERM) {
ksft_test_result_fail("Disabling current's V alive must fail with EPERM(%d)\n",
errno);
return -5;
}
/* Turn on next's vector explicitly and test */
flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0))
return -6;
/* Turn off next's vector explicitly and test */
flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 0))
return -7;
/* Turn on next's vector explicitly and test inherit */
flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
expected = flag | PR_RISCV_V_VSTATE_CTRL_ON;
if (test_and_compare_child(flag, expected, 0))
return -8;
if (test_and_compare_child(flag, expected, 1))
return -9;
/* Turn off next's vector explicitly and test inherit */
flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF;
if (test_and_compare_child(flag, expected, 0))
return -10;
if (test_and_compare_child(flag, expected, 1))
return -11;
/* arguments should fail with EINVAL */
rc = prctl(PR_RISCV_V_SET_CONTROL, 0xff0);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("Undefined control argument should return EINVAL\n");
return -12;
}
rc = prctl(PR_RISCV_V_SET_CONTROL, 0x3);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("Undefined control argument should return EINVAL\n");
return -12;
}
rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("Undefined control argument should return EINVAL\n");
return -12;
}
rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc);
if (rc != -1 || errno != EINVAL) {
ksft_test_result_fail("Undefined control argument should return EINVAL\n");
return -12;
}
ksft_test_result_pass("tests for riscv_v_vstate_ctrl pass\n");
ksft_exit_pass();
return 0;
}
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