1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2016-20 Intel Corporation. */
3
4 #include <stddef.h>
5 #include "defines.h"
6
7 /*
8 * Data buffer spanning two pages that will be placed first in .data
9 * segment. Even if not used internally the second page is needed by
10 * external test manipulating page permissions.
11 */
12 static uint8_t encl_buffer[8192] = { 1 };
13
14 enum sgx_enclu_function {
15 EACCEPT = 0x5,
16 EMODPE = 0x6,
17 };
18
do_encl_emodpe(void * _op)19 static void do_encl_emodpe(void *_op)
20 {
21 struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
22 struct encl_op_emodpe *op = _op;
23
24 secinfo.flags = op->flags;
25
26 asm volatile(".byte 0x0f, 0x01, 0xd7"
27 : /* no outputs */
28 : "a" (EMODPE),
29 "b" (&secinfo),
30 "c" (op->epc_addr)
31 : "memory" /* read from secinfo pointer */);
32 }
33
do_encl_eaccept(void * _op)34 static void do_encl_eaccept(void *_op)
35 {
36 struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
37 struct encl_op_eaccept *op = _op;
38 int rax;
39
40 secinfo.flags = op->flags;
41
42 asm volatile(".byte 0x0f, 0x01, 0xd7"
43 : "=a" (rax)
44 : "a" (EACCEPT),
45 "b" (&secinfo),
46 "c" (op->epc_addr)
47 : "memory" /* read from secinfo pointer */);
48
49 op->ret = rax;
50 }
51
memcpy(void * dest,const void * src,size_t n)52 static void *memcpy(void *dest, const void *src, size_t n)
53 {
54 size_t i;
55
56 for (i = 0; i < n; i++)
57 ((char *)dest)[i] = ((char *)src)[i];
58
59 return dest;
60 }
61
memset(void * dest,int c,size_t n)62 static void *memset(void *dest, int c, size_t n)
63 {
64 size_t i;
65
66 for (i = 0; i < n; i++)
67 ((char *)dest)[i] = c;
68
69 return dest;
70 }
71
do_encl_init_tcs_page(void * _op)72 static void do_encl_init_tcs_page(void *_op)
73 {
74 struct encl_op_init_tcs_page *op = _op;
75 void *tcs = (void *)op->tcs_page;
76 uint32_t val_32;
77
78 memset(tcs, 0, 16); /* STATE and FLAGS */
79 memcpy(tcs + 16, &op->ssa, 8); /* OSSA */
80 memset(tcs + 24, 0, 4); /* CSSA */
81 val_32 = 1;
82 memcpy(tcs + 28, &val_32, 4); /* NSSA */
83 memcpy(tcs + 32, &op->entry, 8); /* OENTRY */
84 memset(tcs + 40, 0, 24); /* AEP, OFSBASE, OGSBASE */
85 val_32 = 0xFFFFFFFF;
86 memcpy(tcs + 64, &val_32, 4); /* FSLIMIT */
87 memcpy(tcs + 68, &val_32, 4); /* GSLIMIT */
88 memset(tcs + 72, 0, 4024); /* Reserved */
89 }
90
do_encl_op_put_to_buf(void * op)91 static void do_encl_op_put_to_buf(void *op)
92 {
93 struct encl_op_put_to_buf *op2 = op;
94
95 memcpy(&encl_buffer[0], &op2->value, 8);
96 }
97
do_encl_op_get_from_buf(void * op)98 static void do_encl_op_get_from_buf(void *op)
99 {
100 struct encl_op_get_from_buf *op2 = op;
101
102 memcpy(&op2->value, &encl_buffer[0], 8);
103 }
104
do_encl_op_put_to_addr(void * _op)105 static void do_encl_op_put_to_addr(void *_op)
106 {
107 struct encl_op_put_to_addr *op = _op;
108
109 memcpy((void *)op->addr, &op->value, 8);
110 }
111
do_encl_op_get_from_addr(void * _op)112 static void do_encl_op_get_from_addr(void *_op)
113 {
114 struct encl_op_get_from_addr *op = _op;
115
116 memcpy(&op->value, (void *)op->addr, 8);
117 }
118
do_encl_op_nop(void * _op)119 static void do_encl_op_nop(void *_op)
120 {
121
122 }
123
encl_body(void * rdi,void * rsi)124 void encl_body(void *rdi, void *rsi)
125 {
126 const void (*encl_op_array[ENCL_OP_MAX])(void *) = {
127 do_encl_op_put_to_buf,
128 do_encl_op_get_from_buf,
129 do_encl_op_put_to_addr,
130 do_encl_op_get_from_addr,
131 do_encl_op_nop,
132 do_encl_eaccept,
133 do_encl_emodpe,
134 do_encl_init_tcs_page,
135 };
136
137 struct encl_op_header *op = (struct encl_op_header *)rdi;
138
139 if (op->type < ENCL_OP_MAX)
140 (*encl_op_array[op->type])(op);
141 }
142