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Message-ID: <20251001111451.299163-3-yongxuan.wang@sifive.com>
Date: Wed, 1 Oct 2025 19:14:27 +0800
From: Yong-Xuan Wang <yongxuan.wang@...ive.com>
To: linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org
Cc: greentime.hu@...ive.com,
vincent.chen@...ive.com,
andybnac@...il.com,
Yong-Xuan Wang <yongxuan.wang@...ive.com>,
Shuah Khan <shuah@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandre Ghiti <alex@...ti.fr>,
Charlie Jenkins <charlie@...osinc.com>,
linux-kselftest@...r.kernel.org
Subject: [PATCH v 2/2] selftests: riscv: Add test for the Vector ptrace interface
Add a test case that does some basic verification of the Vector ptrace
interface. This forks a child process then using ptrace to inspect and
manipulate the v31 register of the child.
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
---
tools/testing/selftests/riscv/vector/Makefile | 5 +-
.../selftests/riscv/vector/vstate_ptrace.c | 132 ++++++++++++++++++
2 files changed, 136 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/riscv/vector/vstate_ptrace.c
diff --git a/tools/testing/selftests/riscv/vector/Makefile b/tools/testing/selftests/riscv/vector/Makefile
index 6f7497f4e7b3..45f25e9dd264 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 := v_initval vstate_prctl
+TEST_GEN_PROGS := v_initval vstate_prctl vsate_ptrace
TEST_GEN_PROGS_EXTENDED := vstate_exec_nolibc v_exec_initval_nolibc
include ../../lib.mk
@@ -26,3 +26,6 @@ $(OUTPUT)/v_initval: v_initval.c $(OUTPUT)/sys_hwprobe.o $(OUTPUT)/v_helpers.o
$(OUTPUT)/v_exec_initval_nolibc: v_exec_initval_nolibc.c
$(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \
-Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc
+
+$(OUTPUT)/vstate_ptrace: vstate_ptrace.c $(OUTPUT)/sys_hwprobe.o $(OUTPUT)/v_helpers.o
+ $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^
diff --git a/tools/testing/selftests/riscv/vector/vstate_ptrace.c b/tools/testing/selftests/riscv/vector/vstate_ptrace.c
new file mode 100644
index 000000000000..8a7bcf318e59
--- /dev/null
+++ b/tools/testing/selftests/riscv/vector/vstate_ptrace.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <stdio.h>
+#include <stdlib.h>
+#include <asm/ptrace.h>
+#include <linux/elf.h>
+#include <sys/ptrace.h>
+#include <sys/uio.h>
+#include <sys/wait.h>
+#include "../../kselftest.h"
+#include "v_helpers.h"
+
+int parent_set_val, child_set_val;
+
+static long do_ptrace(enum __ptrace_request op, pid_t pid, long type, size_t size, void *data)
+{
+ struct iovec v_iovec = {
+ .iov_len = size,
+ .iov_base = data
+ };
+
+ return ptrace(op, pid, type, &v_iovec);
+}
+
+static int do_child(void)
+{
+ int out;
+
+ if (ptrace(PTRACE_TRACEME, -1, NULL, NULL)) {
+ ksft_perror("PTRACE_TRACEME failed\n");
+ return EXIT_FAILURE;
+ }
+
+ asm volatile (".option push\n\t"
+ ".option arch, +v\n\t"
+ "vsetivli x0, 1, e32, m1, ta, ma\n\t"
+ "vmv.s.x v31, %[in]\n\t"
+ "ebreak\n\t"
+ "vmv.x.s %[out], v31\n\t"
+ ".option pop\n\t"
+ : [out] "=r" (out)
+ : [in] "r" (child_set_val));
+
+ if (out != parent_set_val)
+ return EXIT_FAILURE;
+
+ return EXIT_SUCCESS;
+}
+
+static void do_parent(pid_t child)
+{
+ int status;
+ void *data = NULL;
+
+ /* Attach to the child */
+ while (waitpid(child, &status, 0)) {
+ if (WIFEXITED(status)) {
+ ksft_test_result(WEXITSTATUS(status) == 0, "SETREGSET vector\n");
+ goto out;
+ } else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP)) {
+ size_t size, t;
+ void *data, *v31;
+ struct __riscv_v_regset_state *v_regset_hdr;
+ struct user_regs_struct *gpreg;
+
+ size = sizeof(*v_regset_hdr);
+ data = malloc(size);
+ if (!data)
+ goto out;
+ v_regset_hdr = (struct __riscv_v_regset_state *)data;
+
+ if (do_ptrace(PTRACE_GETREGSET, child, NT_RISCV_VECTOR, size, data))
+ goto out;
+
+ ksft_print_msg("vlenb %ld\n", v_regset_hdr->vlenb);
+ data = realloc(data, size + v_regset_hdr->vlenb * 32);
+ if (!data)
+ goto out;
+ v31 = (void *)(data + size + v_regset_hdr->vlenb * 31);
+ size += v_regset_hdr->vlenb * 32;
+
+ if (do_ptrace(PTRACE_GETREGSET, child, NT_RISCV_VECTOR, size, data))
+ goto out;
+
+ ksft_test_result(*(int *)v31 == child_set_val, "GETREGSET vector\n");
+
+ *(int *)v31 = parent_set_val;
+ if (do_ptrace(PTRACE_SETREGSET, child, NT_RISCV_VECTOR, size, data))
+ goto out;
+
+ /* move the pc forward */
+ size = sizeof(*gpreg);
+ data = realloc(data, size);
+ gpreg = (struct user_regs_struct *)data;
+
+ if (do_ptrace(PTRACE_GETREGSET, child, NT_PRSTATUS, size, data))
+ goto out;
+
+ gpreg->pc += 2;
+ if (do_ptrace(PTRACE_SETREGSET, child, NT_PRSTATUS, size, data))
+ goto out;
+ }
+
+ ptrace(PTRACE_CONT, child, NULL, NULL);
+ }
+
+out:
+ free(data);
+}
+
+int main(void)
+{
+ pid_t child;
+
+ ksft_set_plan(2);
+ if (!is_vector_supported() && !is_xtheadvector_supported())
+ ksft_exit_skip("Vector not supported\n");
+
+ srandom(getpid());
+ parent_set_val = rand();
+ child_set_val = rand();
+
+ child = fork();
+ if (child < 0)
+ ksft_exit_fail_msg("Fork failed %d\n", child);
+
+ if (!child)
+ return do_child();
+
+ do_parent(child);
+
+ ksft_finished();
+}
--
2.43.0
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