mirror of
https://github.com/corda/corda.git
synced 2025-01-07 13:38:47 +00:00
9441de4c38
This release is used in conjunction with the linux-sgx-driver Intial release: https://github.com/01org/linux-sgx-driver commit-id: 0e865ce5e6b297a787bcdc12d98bada8174be6d7 Intel-id: 33399 Signed-off-by: Angie Chinchilla <angie.v.chinchilla@intel.com>
113 lines
4.0 KiB
C++
113 lines
4.0 KiB
C++
/*
|
|
* Copyright (C) 2011-2016 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 "arch.h"
|
|
#include "xsave.h"
|
|
#include "trts_inst.h"
|
|
#include "util.h"
|
|
|
|
// 'SYNTHETIC_STATE' buffer size is (512 + 64 + 256) bytes
|
|
// 512 for fxsave buffer,
|
|
// 64 for xsave header,
|
|
// 256 for YMM State (16 * 16 bytes of each YMMH-register)
|
|
// and the buffer should be 64 byte aligned.
|
|
#define SYNTHETIC_STATE_SIZE (512 + 64 + 256)
|
|
|
|
se_static_assert(SYNTHETIC_STATE_SIZE <= SE_PAGE_SIZE);
|
|
|
|
static SE_DECLSPEC_ALIGN(4096) const uint16_t
|
|
SYNTHETIC_STATE[SYNTHETIC_STATE_SIZE/sizeof(uint16_t)] = {
|
|
0x037F, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1F80, 0, 0xFFFF, 0
|
|
};
|
|
|
|
static int g_xsave_enabled; // flag to indicate whether xsave is enabled or not
|
|
|
|
// EENTER will set xcr0 with secs.attr.xfrm,
|
|
// So use the xfeature mask from report instead of calling xgetbv
|
|
uint64_t get_xfeature_state()
|
|
{
|
|
// target_info and report_data are useless
|
|
// we only need to make sure their alignment and within enclave
|
|
// so set the pointers to SYNTHETIC_STATE
|
|
sgx_target_info_t *target_info = (sgx_target_info_t *)SYNTHETIC_STATE;
|
|
sgx_report_data_t *report_data = (sgx_report_data_t *)SYNTHETIC_STATE;
|
|
uint8_t buffer[sizeof(sgx_report_t) + REPORT_ALIGN_SIZE -1] = {0};
|
|
sgx_report_t *report = (sgx_report_t *)ROUND_TO((size_t)buffer, REPORT_ALIGN_SIZE);
|
|
|
|
do_ereport(target_info, report_data, report);
|
|
|
|
g_xsave_enabled = (report->body.attributes.xfrm == SGX_XFRM_LEGACY) ? 0 : 1;
|
|
uint64_t xfrm = report->body.attributes.xfrm;
|
|
|
|
// no secrets in target_info, report_data, and report. no need to clear them before return
|
|
// tlibc functions cannot be used before calling init_optimized_libs().
|
|
|
|
return xfrm;
|
|
}
|
|
|
|
// save_and_clean_xfeature_regs()
|
|
// do fwait, fxsave, and then clean the extended feature registers
|
|
// Parameters:
|
|
// buffer - If the pointer is not NULL, save the CPU state to the memory
|
|
// Return Value:
|
|
// none
|
|
void save_and_clean_xfeature_regs(uint8_t *buffer)
|
|
{
|
|
do_fwait();
|
|
|
|
if(buffer != 0)
|
|
{
|
|
uint8_t *buf = (uint8_t*)ROUND_TO((size_t)buffer, FXSAVE_ALIGN_SIZE);
|
|
do_fxsave(buf);
|
|
}
|
|
|
|
if(g_xsave_enabled)
|
|
{
|
|
do_xrstor(SYNTHETIC_STATE);
|
|
}
|
|
else
|
|
{
|
|
do_fxrstor(SYNTHETIC_STATE);
|
|
}
|
|
}
|
|
// restore_xfeature_regs()
|
|
// restore the extended feature registers
|
|
//
|
|
void restore_xfeature_regs(const uint8_t *buffer)
|
|
{
|
|
if(buffer != 0)
|
|
{
|
|
uint8_t *buf = (uint8_t*)ROUND_TO((size_t)buffer, FXSAVE_ALIGN_SIZE);
|
|
do_fxrstor(buf);
|
|
}
|
|
}
|