summaryrefslogtreecommitdiff
path: root/tools
diff options
context:
space:
mode:
authorAndy Chiu <andy.chiu@sifive.com>2023-06-27 01:55:55 +0000
committerPalmer Dabbelt <palmer@rivosinc.com>2023-07-01 07:38:22 -0700
commit5c93c4c72fbc69f0f1cdf43c9402b923314e67c8 (patch)
treedba54ed4062320b45b8c700593cc09325ee9aa32 /tools
parent75b59f2a90aa7ccac62e3dcb680dfb967b341431 (diff)
selftests: Test RISC-V Vector's first-use handler
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/riscv/vector/.gitignore1
-rw-r--r--tools/testing/selftests/riscv/vector/Makefile6
-rw-r--r--tools/testing/selftests/riscv/vector/v_initval_nolibc.c68
3 files changed, 74 insertions, 1 deletions
diff --git a/tools/testing/selftests/riscv/vector/.gitignore b/tools/testing/selftests/riscv/vector/.gitignore
index 4f2b4e8a3b08..9ae7964491d5 100644
--- a/tools/testing/selftests/riscv/vector/.gitignore
+++ b/tools/testing/selftests/riscv/vector/.gitignore
@@ -1,2 +1,3 @@
vstate_exec_nolibc
vstate_prctl
+v_initval_nolibc
diff --git a/tools/testing/selftests/riscv/vector/Makefile b/tools/testing/selftests/riscv/vector/Makefile
index cd6e80bf995d..bfff0ff4f3be 100644
--- a/tools/testing/selftests/riscv/vector/Makefile
+++ b/tools/testing/selftests/riscv/vector/Makefile
@@ -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
diff --git a/tools/testing/selftests/riscv/vector/v_initval_nolibc.c b/tools/testing/selftests/riscv/vector/v_initval_nolibc.c
new file mode 100644
index 000000000000..66764edb0d52
--- /dev/null
+++ b/tools/testing/selftests/riscv/vector/v_initval_nolibc.c
@@ -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;
+}