5c93c4c72f
This add a test to check if the kernel zero-initializes all V registers after the first-use trap handler returns. If V registers are not zero-initialized, then the test should fail one out of several runs: ``` root@sifive-fpga:~# ./v_initval_nolibc # vl = 256 not ok 1 detect stale values on v-regesters 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4c 41 4e 47 3d 43 0 50 41 54 48 3d 2f 75 73 72 2f 6c 6f 63 61 6c 2f 73 62 69 6e 3a 2f 75 73 72 2f 6c 6f 63 61 6c 2f 62 69 6e 3a 2f 75 73 72 ff ff 81 0 0 0 0 0 0 0 0 0 0 0 0 0 ``` Otherwise, the test passes without errors each run. Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20230627015556.12329-3-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "../../kselftest.h"
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#define MAX_VSIZE (8192 * 32)
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void dump(char *ptr, int size)
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{
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int i = 0;
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for (i = 0; i < size; i++) {
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if (i != 0) {
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if (i % 16 == 0)
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printf("\n");
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else if (i % 8 == 0)
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printf(" ");
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}
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printf("%02x ", ptr[i]);
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}
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printf("\n");
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}
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int main(void)
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{
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int i;
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unsigned long vl;
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char *datap, *tmp;
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datap = malloc(MAX_VSIZE);
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if (!datap) {
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ksft_test_result_fail("fail to allocate memory for size = %lu\n", MAX_VSIZE);
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exit(-1);
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}
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tmp = datap;
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asm volatile (
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".option push\n\t"
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".option arch, +v\n\t"
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"vsetvli %0, x0, e8, m8, ta, ma\n\t"
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"vse8.v v0, (%2)\n\t"
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"add %1, %2, %0\n\t"
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"vse8.v v8, (%1)\n\t"
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"add %1, %1, %0\n\t"
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"vse8.v v16, (%1)\n\t"
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"add %1, %1, %0\n\t"
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"vse8.v v24, (%1)\n\t"
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".option pop\n\t"
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: "=&r" (vl), "=r" (tmp) : "r" (datap) : "memory");
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ksft_print_msg("vl = %lu\n", vl);
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if (datap[0] != 0x00 && datap[0] != 0xff) {
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ksft_test_result_fail("v-regesters are not properly initialized\n");
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dump(datap, vl * 4);
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exit(-1);
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}
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for (i = 1; i < vl * 4; i++) {
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if (datap[i] != datap[0]) {
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ksft_test_result_fail("detect stale values on v-regesters\n");
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dump(datap, vl * 4);
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exit(-2);
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}
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}
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free(datap);
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ksft_exit_pass();
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return 0;
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}
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