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- /*
- * this function is shamelessly stolen from linux-sgx
- * https://github.com/intel/linux-sgx/blob/9ddec08fb98c1636ed3b1a77bbc4fa3520344ede/sdk/trts/trts_xsave.cpp
- * It has BSD lisence.
- */
- /*
- * Copyright (C) 2011-2019 Intel Corporation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include <pal_linux.h>
- #include <pal_linux_error.h>
- #include <pal_internal.h>
- #include <pal_debug.h>
- #include <pal_error.h>
- #include <pal_security.h>
- #include <pal_crypto.h>
- #include <api.h>
- #include <list.h>
- #include <stdbool.h>
- #include "enclave_pages.h"
- int xsave_enabled = 0;
- uint64_t xsave_features = 0;
- uint32_t xsave_size = 0;
- //FXRSTOR only cares about the first 512 bytes, while
- //XRSTOR in compacted mode will ignore the first 512 bytes.
- const uint32_t xsave_reset_state[XSAVE_RESET_STATE_SIZE/sizeof(uint32_t)]
- __attribute__((aligned(PAL_XSTATE_ALIGN))) = {
- 0x037F, 0, 0, 0, 0, 0, 0x1F80, 0xFFFF, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0x80000000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // XCOMP_BV[63] = 1, compaction mode
- };
- void init_xsave_size(uint64_t xfrm) {
- const struct {
- uint64_t bits;
- uint32_t size;
- } xsave_size_table[] = { // Note that the xsave_size should be in ascending order
- {SGX_XFRM_LEGACY, 512 + 64}, // 512 for legacy features, 64 for xsave header
- {SGX_XFRM_AVX, 512 + 64 + 256}, // 256 for YMM0_H - YMM15_H registers
- {SGX_XFRM_MPX, 512 + 64 + 256 + 256}, // 256 for MPX
- {SGX_XFRM_AVX512, 512 + 64 + 256 + 256 + 1600}, // 1600 for k0 - k7, ZMM0_H - ZMM15_H, ZMM16 - ZMM31
- };
- /* fxsave/fxrstore as fallback */
- xsave_enabled = 0;
- xsave_features = PAL_XFEATURE_MASK_FPSSE;
- xsave_size = 512 + 64;
- if (!xfrm || (xfrm & SGX_XFRM_RESERVED)) {
- SGX_DBG(DBG_M, "xsave is disabled, xfrm 0x%lx\n", xfrm);
- return;
- }
- xsave_enabled = (xfrm == SGX_XFRM_LEGACY) ? 0 : 1;
- for (size_t i = 0; i < ARRAY_SIZE(xsave_size_table); i++) {
- if ((xfrm & xsave_size_table[i].bits) == xsave_size_table[i].bits) {
- xsave_features = xfrm;
- xsave_size = xsave_size_table[i].size;
- }
- }
- SGX_DBG(DBG_M, "xsave is enabled with xsave_size: %u\n", xsave_size);
- }
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