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author | Andy Chiu <andy.chiu@sifive.com> | 2023-06-27 03:55:55 +0200 |
---|---|---|
committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-07-01 16:38:22 +0200 |
commit | 5c93c4c72fbc69f0f1cdf43c9402b923314e67c8 (patch) | |
tree | dba54ed4062320b45b8c700593cc09325ee9aa32 /tools | |
parent | riscv: vector: clear V-reg in the first-use trap (diff) | |
download | linux-5c93c4c72fbc69f0f1cdf43c9402b923314e67c8.tar.xz linux-5c93c4c72fbc69f0f1cdf43c9402b923314e67c8.zip |
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/.gitignore | 1 | ||||
-rw-r--r-- | tools/testing/selftests/riscv/vector/Makefile | 6 | ||||
-rw-r--r-- | tools/testing/selftests/riscv/vector/v_initval_nolibc.c | 68 |
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; +} |