1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright(c) 2016-20 Intel Corporation.
4 */
5
6	.macro ENCLU
7	.byte 0x0f, 0x01, 0xd7
8	.endm
9
10	.section ".tcs", "aw"
11	.balign	4096
12
13	.fill	1, 8, 0			# STATE (set by CPU)
14	.fill	1, 8, 0			# FLAGS
15	.quad	encl_ssa_tcs1		# OSSA
16	.fill	1, 4, 0			# CSSA (set by CPU)
17	.fill	1, 4, 1			# NSSA
18	.quad	encl_entry		# OENTRY
19	.fill	1, 8, 0			# AEP (set by EENTER and ERESUME)
20	.fill	1, 8, 0			# OFSBASE
21	.fill	1, 8, 0			# OGSBASE
22	.fill	1, 4, 0xFFFFFFFF 	# FSLIMIT
23	.fill	1, 4, 0xFFFFFFFF	# GSLIMIT
24	.fill	4024, 1, 0		# Reserved
25
26	# TCS2
27	.fill	1, 8, 0			# STATE (set by CPU)
28	.fill	1, 8, 0			# FLAGS
29	.quad	encl_ssa_tcs2		# OSSA
30	.fill	1, 4, 0			# CSSA (set by CPU)
31	.fill	1, 4, 1			# NSSA
32	.quad	encl_entry		# OENTRY
33	.fill	1, 8, 0			# AEP (set by EENTER and ERESUME)
34	.fill	1, 8, 0			# OFSBASE
35	.fill	1, 8, 0			# OGSBASE
36	.fill	1, 4, 0xFFFFFFFF 	# FSLIMIT
37	.fill	1, 4, 0xFFFFFFFF	# GSLIMIT
38	.fill	4024, 1, 0		# Reserved
39
40	.text
41
42encl_entry:
43	# RBX contains the base address for TCS, which is the first address
44	# inside the enclave for TCS #1 and one page into the enclave for
45	# TCS #2. First make it relative by substracting __encl_base and
46	# then add the address of encl_stack to get the address for the stack.
47	lea __encl_base(%rip), %rax
48	sub %rax, %rbx
49	lea encl_stack(%rip), %rax
50	add %rbx, %rax
51	jmp encl_entry_core
52encl_dyn_entry:
53	# Entry point for dynamically created TCS page expected to follow
54	# its stack directly.
55	lea -1(%rbx), %rax
56encl_entry_core:
57	xchg	%rsp, %rax
58	push	%rax
59
60	push	%rcx # push the address after EENTER
61
62	# NOTE: as the selftest enclave is *not* intended for production,
63	# simplify the code by not initializing ABI registers on entry or
64	# cleansing caller-save registers on exit.
65	call	encl_body
66
67	# Prepare EEXIT target by popping the address of the instruction after
68	# EENTER to RBX.
69	pop	%rbx
70
71	# Restore the caller stack.
72	pop	%rax
73	mov	%rax, %rsp
74
75	# EEXIT
76	mov	$4, %rax
77	enclu
78
79	.section ".data", "aw"
80
81encl_ssa_tcs1:
82	.space 4096
83encl_ssa_tcs2:
84	.space 4096
85
86	.balign 4096
87	# Stack of TCS #1
88	.space 4096
89encl_stack:
90	.balign 4096
91	# Stack of TCS #2
92	.space 4096
93