1 files changed, 162 insertions, 0 deletions
diff --git a/tools/testing/selftests/sgx/test_encl.c b/tools/testing/selftests/sgx/test_encl.c
new file mode 100644
index 000000000000..2c4d709cce2d
--- /dev/null
+++ b/tools/testing/selftests/sgx/test_encl.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*  Copyright(c) 2016-20 Intel Corporation. */
+
+#include <stddef.h>
+#include "defines.h"
+
+/*
+ * Data buffer spanning two pages that will be placed first in the .data
+ * segment via the linker script. Even if not used internally the second page
+ * is needed by external test manipulating page permissions, so mark
+ * encl_buffer as "used" to make sure it is entirely preserved by the compiler.
+ */
+static uint8_t __used __section(".data.encl_buffer") encl_buffer[8192] = { 1 };
+
+enum sgx_enclu_function {
+	EACCEPT = 0x5,
+	EMODPE = 0x6,
+};
+
+static void do_encl_emodpe(void *_op)
+{
+	struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
+	struct encl_op_emodpe *op = _op;
+
+	secinfo.flags = op->flags;
+
+	asm volatile(".byte 0x0f, 0x01, 0xd7"
+				: /* no outputs */
+				: "a" (EMODPE),
+				  "b" (&secinfo),
+				  "c" (op->epc_addr)
+				: "memory" /* read from secinfo pointer */);
+}
+
+static void do_encl_eaccept(void *_op)
+{
+	struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
+	struct encl_op_eaccept *op = _op;
+	int rax;
+
+	secinfo.flags = op->flags;
+
+	asm volatile(".byte 0x0f, 0x01, 0xd7"
+				: "=a" (rax)
+				: "a" (EACCEPT),
+				  "b" (&secinfo),
+				  "c" (op->epc_addr)
+				: "memory" /* read from secinfo pointer */);
+
+	op->ret = rax;
+}
+
+static void *memcpy(void *dest, const void *src, size_t n)
+{
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		((char *)dest)[i] = ((char *)src)[i];
+
+	return dest;
+}
+
+static void *memset(void *dest, int c, size_t n)
+{
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		((char *)dest)[i] = c;
+
+	return dest;
+}
+
+static void do_encl_init_tcs_page(void *_op)
+{
+	struct encl_op_init_tcs_page *op = _op;
+	void *tcs = (void *)op->tcs_page;
+	uint32_t val_32;
+
+	memset(tcs, 0, 16);			/* STATE and FLAGS */
+	memcpy(tcs + 16, &op->ssa, 8);		/* OSSA */
+	memset(tcs + 24, 0, 4);			/* CSSA */
+	val_32 = 1;
+	memcpy(tcs + 28, &val_32, 4);		/* NSSA */
+	memcpy(tcs + 32, &op->entry, 8);	/* OENTRY */
+	memset(tcs + 40, 0, 24);		/* AEP, OFSBASE, OGSBASE */
+	val_32 = 0xFFFFFFFF;
+	memcpy(tcs + 64, &val_32, 4);		/* FSLIMIT */
+	memcpy(tcs + 68, &val_32, 4);		/* GSLIMIT */
+	memset(tcs + 72, 0, 4024);		/* Reserved */
+}
+
+static void do_encl_op_put_to_buf(void *op)
+{
+	struct encl_op_put_to_buf *op2 = op;
+
+	memcpy(&encl_buffer[0], &op2->value, 8);
+}
+
+static void do_encl_op_get_from_buf(void *op)
+{
+	struct encl_op_get_from_buf *op2 = op;
+
+	memcpy(&op2->value, &encl_buffer[0], 8);
+}
+
+static void do_encl_op_put_to_addr(void *_op)
+{
+	struct encl_op_put_to_addr *op = _op;
+
+	memcpy((void *)op->addr, &op->value, 8);
+}
+
+static void do_encl_op_get_from_addr(void *_op)
+{
+	struct encl_op_get_from_addr *op = _op;
+
+	memcpy(&op->value, (void *)op->addr, 8);
+}
+
+static void do_encl_op_nop(void *_op)
+{
+
+}
+
+/*
+ * Symbol placed at the start of the enclave image by the linker script.
+ * Declare this extern symbol with visibility "hidden" to ensure the compiler
+ * does not access it through the GOT and generates position-independent
+ * addressing as __encl_base(%rip), so we can get the actual enclave base
+ * during runtime.
+ */
+extern const uint8_t __attribute__((visibility("hidden"))) __encl_base;
+
+typedef void (*encl_op_t)(void *);
+static const encl_op_t encl_op_array[ENCL_OP_MAX] = {
+	do_encl_op_put_to_buf,
+	do_encl_op_get_from_buf,
+	do_encl_op_put_to_addr,
+	do_encl_op_get_from_addr,
+	do_encl_op_nop,
+	do_encl_eaccept,
+	do_encl_emodpe,
+	do_encl_init_tcs_page,
+};
+
+void encl_body(void *rdi,  void *rsi)
+{
+	struct encl_op_header *header = (struct encl_op_header *)rdi;
+	encl_op_t op;
+
+	if (header->type >= ENCL_OP_MAX)
+		return;
+
+	/*
+	 * The enclave base address needs to be added, as this call site
+	 * *cannot be* made rip-relative by the compiler, or fixed up by
+	 * any other possible means.
+	 */
+	op = ((uint64_t)&__encl_base) + encl_op_array[header->type];
+
+	(*op)(header);
+}