1 files changed, 134 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
new file mode 100644
index 000000000..4436ca9d3
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Ptrace test for TAR, PPR, DSCR registers
+ *
+ * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
+ */
+#include "ptrace.h"
+#include "ptrace-tar.h"
+
+/* Tracer and Tracee Shared Data */
+int shm_id;
+int *cptr;
+int *pptr;
+
+void tar(void)
+{
+	unsigned long reg[3];
+	int ret;
+
+	cptr = (int *)shmat(shm_id, NULL, 0);
+	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
+			user_write, TAR_1, PPR_1, DSCR_1);
+
+	mtspr(SPRN_TAR, TAR_1);
+	mtspr(SPRN_PPR, PPR_1);
+	mtspr(SPRN_DSCR, DSCR_1);
+
+	cptr[2] = 1;
+
+	/* Wait on parent */
+	while (!cptr[0])
+		asm volatile("" : : : "memory");
+
+	reg[0] = mfspr(SPRN_TAR);
+	reg[1] = mfspr(SPRN_PPR);
+	reg[2] = mfspr(SPRN_DSCR);
+
+	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
+			user_read, reg[0], reg[1], reg[2]);
+
+	/* Unblock the parent now */
+	cptr[1] = 1;
+	shmdt((int *)cptr);
+
+	ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
+	if (ret)
+		exit(1);
+	exit(0);
+}
+
+int trace_tar(pid_t child)
+{
+	unsigned long reg[3];
+
+	FAIL_IF(start_trace(child));
+	FAIL_IF(show_tar_registers(child, reg));
+	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
+			ptrace_read_running, reg[0], reg[1], reg[2]);
+
+	FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
+	FAIL_IF(stop_trace(child));
+	return TEST_PASS;
+}
+
+int trace_tar_write(pid_t child)
+{
+	FAIL_IF(start_trace(child));
+	FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
+	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
+			ptrace_write_running, TAR_2, PPR_2, DSCR_2);
+
+	FAIL_IF(stop_trace(child));
+	return TEST_PASS;
+}
+
+int ptrace_tar(void)
+{
+	pid_t pid;
+	int ret, status;
+
+	// TAR was added in v2.07
+	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
+
+	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
+	pid = fork();
+	if (pid < 0) {
+		perror("fork() failed");
+		return TEST_FAIL;
+	}
+
+	if (pid == 0)
+		tar();
+
+	if (pid) {
+		pptr = (int *)shmat(shm_id, NULL, 0);
+		pptr[0] = 0;
+		pptr[1] = 0;
+
+		while (!pptr[2])
+			asm volatile("" : : : "memory");
+		ret = trace_tar(pid);
+		if (ret)
+			return ret;
+
+		ret = trace_tar_write(pid);
+		if (ret)
+			return ret;
+
+		/* Unblock the child now */
+		pptr[0] = 1;
+
+		/* Wait on child */
+		while (!pptr[1])
+			asm volatile("" : : : "memory");
+
+		shmdt((int *)pptr);
+
+		ret = wait(&status);
+		shmctl(shm_id, IPC_RMID, NULL);
+		if (ret != pid) {
+			printf("Child's exit status not captured\n");
+			return TEST_PASS;
+		}
+
+		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
+			TEST_PASS;
+	}
+	return TEST_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+	return test_harness(ptrace_tar, "ptrace_tar");
+}