Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2015-2019 ARM Limited.
3// Original author: Dave Martin <Dave.Martin@arm.com>
4
5#ifndef ASSEMBLER_H
6#define ASSEMBLER_H
7
8.macro __for from:req, to:req
9 .if (\from) == (\to)
10 _for__body %\from
11 .else
12 __for \from, %(\from) + ((\to) - (\from)) / 2
13 __for %(\from) + ((\to) - (\from)) / 2 + 1, \to
14 .endif
15.endm
16
17.macro _for var:req, from:req, to:req, insn:vararg
18 .macro _for__body \var:req
19 .noaltmacro
20 \insn
21 .altmacro
22 .endm
23
24 .altmacro
25 __for \from, \to
26 .noaltmacro
27
28 .purgem _for__body
29.endm
30
31.macro function name
32 .macro endfunction
33 .type \name, @function
34 .purgem endfunction
35 .endm
36\name:
37.endm
38
39.macro define_accessor name, num, insn
40 .macro \name\()_entry n
41 \insn \n, 1
42 ret
43 .endm
44
45function \name
46 adr x2, .L__accessor_tbl\@
47 add x2, x2, x0, lsl #3
48 br x2
49
50.L__accessor_tbl\@:
51 _for x, 0, (\num) - 1, \name\()_entry \x
52endfunction
53
54 .purgem \name\()_entry
55.endm
56
57// Utility macro to print a literal string
58// Clobbers x0-x4,x8
59.macro puts string
60 .pushsection .rodata.str1.1, "aMS", @progbits, 1
61.L__puts_literal\@: .string "\string"
62 .popsection
63
64 ldr x0, =.L__puts_literal\@
65 bl puts
66.endm
67
68#define PR_SET_SHADOW_STACK_STATUS 75
69# define PR_SHADOW_STACK_ENABLE (1UL << 0)
70
71.macro enable_gcs
72 // Run with GCS
73 mov x0, PR_SET_SHADOW_STACK_STATUS
74 mov x1, PR_SHADOW_STACK_ENABLE
75 mov x2, xzr
76 mov x3, xzr
77 mov x4, xzr
78 mov x5, xzr
79 mov x8, #__NR_prctl
80 svc #0
81.endm
82
83#endif /* ! ASSEMBLER_H */