1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright(c) 2016-20 Intel Corporation.
*/
.macro ENCLU
.byte 0x0f, 0x01, 0xd7
.endm
.section ".tcs", "aw"
.balign 4096
.fill 1, 8, 0 # STATE (set by CPU)
.fill 1, 8, 0 # FLAGS
.quad encl_ssa_tcs1 # OSSA
.fill 1, 4, 0 # CSSA (set by CPU)
.fill 1, 4, 1 # NSSA
.quad encl_entry # OENTRY
.fill 1, 8, 0 # AEP (set by EENTER and ERESUME)
.fill 1, 8, 0 # OFSBASE
.fill 1, 8, 0 # OGSBASE
.fill 1, 4, 0xFFFFFFFF # FSLIMIT
.fill 1, 4, 0xFFFFFFFF # GSLIMIT
.fill 4024, 1, 0 # Reserved
# TCS2
.fill 1, 8, 0 # STATE (set by CPU)
.fill 1, 8, 0 # FLAGS
.quad encl_ssa_tcs2 # OSSA
.fill 1, 4, 0 # CSSA (set by CPU)
.fill 1, 4, 1 # NSSA
.quad encl_entry # OENTRY
.fill 1, 8, 0 # AEP (set by EENTER and ERESUME)
.fill 1, 8, 0 # OFSBASE
.fill 1, 8, 0 # OGSBASE
.fill 1, 4, 0xFFFFFFFF # FSLIMIT
.fill 1, 4, 0xFFFFFFFF # GSLIMIT
.fill 4024, 1, 0 # Reserved
.text
encl_entry:
# RBX contains the base address for TCS, which is the first address
# inside the enclave for TCS #1 and one page into the enclave for
# TCS #2. By adding the value of encl_stack to it, we get
# the absolute address for the stack.
lea (encl_stack)(%rbx), %rax
jmp encl_entry_core
encl_dyn_entry:
# Entry point for dynamically created TCS page expected to follow
# its stack directly.
lea -1(%rbx), %rax
encl_entry_core:
xchg %rsp, %rax
push %rax
push %rcx # push the address after EENTER
call encl_body
/* Clear volatile GPRs, except RAX (EEXIT function). */
xor %rcx, %rcx
xor %rdx, %rdx
xor %rdi, %rdi
xor %rsi, %rsi
xor %r8, %r8
xor %r9, %r9
xor %r10, %r10
xor %r11, %r11
# Reset status flags.
add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1
# Prepare EEXIT target by popping the address of the instruction after
# EENTER to RBX.
pop %rbx
# Restore the caller stack.
pop %rax
mov %rax, %rsp
# EEXIT
mov $4, %rax
enclu
.section ".data", "aw"
encl_ssa_tcs1:
.space 4096
encl_ssa_tcs2:
.space 4096
.balign 4096
# Stack of TCS #1
.space 4096
encl_stack:
.balign 4096
# Stack of TCS #2
.space 4096
|
