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selftests: Test RISC-V Vector's first-use handler

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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>
This commit is contained in:
Andy Chiu 2023-06-27 01:55:55 +00:00 committed by Palmer Dabbelt
parent 75b59f2a90
commit 5c93c4c72f
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
3 changed files with 74 additions and 1 deletions
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1
tools/testing/selftests/riscv/vector/.gitignore vendored
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@ -1,2 +1,3 @@
vstate_exec_nolibc
vstate_prctl
v_initval_nolibc

6
tools/testing/selftests/riscv/vector/Makefile
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@ -2,7 +2,7 @@
# Copyright (C) 2021 ARM Limited
# Originally tools/testing/arm64/abi/Makefile
TEST_GEN_PROGS := vstate_prctl
TEST_GEN_PROGS := vstate_prctl v_initval_nolibc
TEST_GEN_PROGS_EXTENDED := vstate_exec_nolibc
include ../../lib.mk
@ -13,3 +13,7 @@ $(OUTPUT)/vstate_prctl: vstate_prctl.c ../hwprobe/sys_hwprobe.S
$(OUTPUT)/vstate_exec_nolibc: vstate_exec_nolibc.c
$(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \
-Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc
$(OUTPUT)/v_initval_nolibc: v_initval_nolibc.c
$(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \
-Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc

68
tools/testing/selftests/riscv/vector/v_initval_nolibc.c Normal file
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@ -0,0 +1,68 @@
// SPDX-License-Identifier: GPL-2.0-only
#include "../../kselftest.h"
#define MAX_VSIZE (8192 * 32)
void dump(char *ptr, int size)
{
int i = 0;
for (i = 0; i < size; i++) {
if (i != 0) {
if (i % 16 == 0)
printf("\n");
else if (i % 8 == 0)
printf(" ");
}
printf("%02x ", ptr[i]);
}
printf("\n");
}
int main(void)
{
int i;
unsigned long vl;
char *datap, *tmp;
datap = malloc(MAX_VSIZE);
if (!datap) {
ksft_test_result_fail("fail to allocate memory for size = %lu\n", MAX_VSIZE);
exit(-1);
}
tmp = datap;
asm volatile (
".option push\n\t"
".option arch, +v\n\t"
"vsetvli %0, x0, e8, m8, ta, ma\n\t"
"vse8.v v0, (%2)\n\t"
"add %1, %2, %0\n\t"
"vse8.v v8, (%1)\n\t"
"add %1, %1, %0\n\t"
"vse8.v v16, (%1)\n\t"
"add %1, %1, %0\n\t"
"vse8.v v24, (%1)\n\t"
".option pop\n\t"
: "=&r" (vl), "=r" (tmp) : "r" (datap) : "memory");
ksft_print_msg("vl = %lu\n", vl);
if (datap[0] != 0x00 && datap[0] != 0xff) {
ksft_test_result_fail("v-regesters are not properly initialized\n");
dump(datap, vl * 4);
exit(-1);
}
for (i = 1; i < vl * 4; i++) {
if (datap[i] != datap[0]) {
ksft_test_result_fail("detect stale values on v-regesters\n");
dump(datap, vl * 4);
exit(-2);
}
}
free(datap);
ksft_exit_pass();
return 0;
}