140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2016-20 Intel Corporation. */
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#include <stddef.h>
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#include "defines.h"
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/*
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* Data buffer spanning two pages that will be placed first in .data
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* segment. Even if not used internally the second page is needed by
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* external test manipulating page permissions.
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*/
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static uint8_t encl_buffer[8192] = { 1 };
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enum sgx_enclu_function {
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EACCEPT = 0x5,
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EMODPE = 0x6,
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};
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static void do_encl_emodpe(void *_op)
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{
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struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
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struct encl_op_emodpe *op = _op;
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secinfo.flags = op->flags;
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asm volatile(".byte 0x0f, 0x01, 0xd7"
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:
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: "a" (EMODPE),
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"b" (&secinfo),
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"c" (op->epc_addr));
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}
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static void do_encl_eaccept(void *_op)
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{
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struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
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struct encl_op_eaccept *op = _op;
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int rax;
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secinfo.flags = op->flags;
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asm volatile(".byte 0x0f, 0x01, 0xd7"
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: "=a" (rax)
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: "a" (EACCEPT),
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"b" (&secinfo),
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"c" (op->epc_addr));
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op->ret = rax;
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}
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static void *memcpy(void *dest, const void *src, size_t n)
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{
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size_t i;
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for (i = 0; i < n; i++)
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((char *)dest)[i] = ((char *)src)[i];
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return dest;
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}
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static void *memset(void *dest, int c, size_t n)
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{
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size_t i;
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for (i = 0; i < n; i++)
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((char *)dest)[i] = c;
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return dest;
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}
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static void do_encl_init_tcs_page(void *_op)
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{
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struct encl_op_init_tcs_page *op = _op;
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void *tcs = (void *)op->tcs_page;
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uint32_t val_32;
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memset(tcs, 0, 16); /* STATE and FLAGS */
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memcpy(tcs + 16, &op->ssa, 8); /* OSSA */
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memset(tcs + 24, 0, 4); /* CSSA */
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val_32 = 1;
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memcpy(tcs + 28, &val_32, 4); /* NSSA */
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memcpy(tcs + 32, &op->entry, 8); /* OENTRY */
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memset(tcs + 40, 0, 24); /* AEP, OFSBASE, OGSBASE */
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val_32 = 0xFFFFFFFF;
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memcpy(tcs + 64, &val_32, 4); /* FSLIMIT */
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memcpy(tcs + 68, &val_32, 4); /* GSLIMIT */
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memset(tcs + 72, 0, 4024); /* Reserved */
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}
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static void do_encl_op_put_to_buf(void *op)
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{
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struct encl_op_put_to_buf *op2 = op;
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memcpy(&encl_buffer[0], &op2->value, 8);
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}
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static void do_encl_op_get_from_buf(void *op)
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{
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struct encl_op_get_from_buf *op2 = op;
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memcpy(&op2->value, &encl_buffer[0], 8);
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}
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static void do_encl_op_put_to_addr(void *_op)
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{
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struct encl_op_put_to_addr *op = _op;
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memcpy((void *)op->addr, &op->value, 8);
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}
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static void do_encl_op_get_from_addr(void *_op)
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{
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struct encl_op_get_from_addr *op = _op;
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memcpy(&op->value, (void *)op->addr, 8);
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}
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static void do_encl_op_nop(void *_op)
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{
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}
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void encl_body(void *rdi, void *rsi)
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{
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const void (*encl_op_array[ENCL_OP_MAX])(void *) = {
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do_encl_op_put_to_buf,
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do_encl_op_get_from_buf,
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do_encl_op_put_to_addr,
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do_encl_op_get_from_addr,
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do_encl_op_nop,
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do_encl_eaccept,
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do_encl_emodpe,
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do_encl_init_tcs_page,
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};
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struct encl_op_header *op = (struct encl_op_header *)rdi;
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if (op->type < ENCL_OP_MAX)
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(*encl_op_array[op->type])(op);
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}
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