summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/x86/thunks.S
blob: 1bb5d62c16a424a2aac14b70fb64546743019b80 (plain)
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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * thunks.S - assembly helpers for mixed-bitness code
 * Copyright (c) 2015 Andrew Lutomirski
 *
 * These are little helpers that make it easier to switch bitness on
 * the fly.
 */

	.text

	.global call32_from_64
	.type call32_from_64, @function
call32_from_64:
	// rdi: stack to use
	// esi: function to call

	// Save registers
	pushq %rbx
	pushq %rbp
	pushq %r12
	pushq %r13
	pushq %r14
	pushq %r15
	pushfq

	// Switch stacks
	mov %rsp,(%rdi)
	mov %rdi,%rsp

	// Switch to compatibility mode
	pushq $0x23  /* USER32_CS */
	pushq $1f
	lretq

1:
	.code32
	// Call the function
	call *%esi
	// Switch back to long mode
	jmp $0x33,$1f
	.code64

1:
	// Restore the stack
	mov (%rsp),%rsp

	// Restore registers
	popfq
	popq %r15
	popq %r14
	popq %r13
	popq %r12
	popq %rbp
	popq %rbx

	ret

.size call32_from_64, .-call32_from_64