linux_syscall/arch/riscv64/
syscall_asm.rs

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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
// Copyright (c) 2022 John Millikin <john@john-millikin.com>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
//
// SPDX-License-Identifier: 0BSD

/// Linux syscall result for the `riscv64` architecture.
#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
#[must_use]
pub struct Result(u64);

impl Result {
	#[inline]
	pub const fn new(register_a0: u64) -> Self {
		Self(register_a0)
	}

	#[inline]
	pub const fn as_u64_unchecked(self) -> u64 {
		self.0
	}

	#[inline]
	pub const fn as_usize_unchecked(self) -> usize {
		self.0 as usize
	}
}

single_register_result64!(Result);

#[cfg(not(doc))]
#[macro_export]
macro_rules! syscall {
	($nr:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr, $a2:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			in("a1") $a2,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr, $a2:expr, $a3:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			in("a1") $a2,
			in("a2") $a3,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			in("a1") $a2,
			in("a2") $a3,
			in("a3") $a4,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			in("a1") $a2,
			in("a2") $a3,
			in("a3") $a4,
			in("a4") $a5,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
	($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr $(,)?) => {{
		let mut out_a0;
		core::arch::asm!(
			"ecall",
			in("a7") u32::from(Into::<$crate::Syscall>::into($nr)),
			in("a0") $a1,
			in("a1") $a2,
			in("a2") $a3,
			in("a3") $a4,
			in("a4") $a5,
			in("a5") $a6,
			lateout("a0") out_a0,
			options(nostack),
		);
		$crate::arch::riscv64::Result::new(out_a0)
	}};
}