diff options
Diffstat (limited to 'vendor/rustix/src/imp/linux_raw/arch/mod.rs')
| -rw-r--r-- | vendor/rustix/src/imp/linux_raw/arch/mod.rs | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/vendor/rustix/src/imp/linux_raw/arch/mod.rs b/vendor/rustix/src/imp/linux_raw/arch/mod.rs new file mode 100644 index 000000000..81f3a255e --- /dev/null +++ b/vendor/rustix/src/imp/linux_raw/arch/mod.rs @@ -0,0 +1,218 @@ +//! Architecture-specific syscall code. +//! +//! `rustix` has inline assembly sequences using `asm!`, but that requires +//! nightly Rust, so it also has out-of-line ("outline") assembly sequences +//! in .s files. And 32-bit x86 is special (see comments below). +//! +//! This module also has a `choose` submodule which chooses a scheme and is +//! what most of the `rustix` syscalls use. +//! +//! # Safety +//! +//! This contains the inline `asm` statements performing the syscall +//! instructions and FFI declarations declaring the out-of-line ("outline") +//! syscall instructions. + +#![allow(unsafe_code)] +#![cfg_attr(not(feature = "all-apis"), allow(unused_imports))] + +// When inline asm is available, use it. Otherwise, use out-of-line asm. These +// functions always use the machine's syscall instruction, even when it isn't +// the fastest option available. +#[cfg_attr(asm, path = "inline/mod.rs")] +#[cfg_attr(not(asm), path = "outline/mod.rs")] +pub(in crate::imp) mod asm; + +// On most architectures, the architecture syscall instruction is fast, so use +// it directly. +#[cfg(any( + target_arch = "arm", + target_arch = "aarch64", + target_arch = "mips", + target_arch = "mips64", + target_arch = "powerpc64", + target_arch = "riscv64", + target_arch = "x86_64", +))] +pub(in crate::imp) use self::asm as choose; + +// On 32-bit x86, use vDSO wrappers for all syscalls. We could use the +// architecture syscall instruction (`int 0x80`), but the vDSO kernel_vsyscall +// mechanism is much faster. +#[cfg(target_arch = "x86")] +pub(in crate::imp) use super::vdso_wrappers::x86_via_vdso as choose; + +// This would be the code for always using `int 0x80` on 32-bit x86. +//#[cfg(target_arch = "x86")] +//pub(in crate::imp) use self::asm as choose; + +// Macros for invoking system calls. +// +// These factor out: +// - Calling `nr` on the syscall number to convert it into `SyscallNumber`. +// - Calling `.into()` on each of the arguments to convert them into `ArgReg`. +// - Qualifying the `syscall*` and `__NR_*` identifiers. +// - Counting the number of arguments. +macro_rules! syscall { + ($nr:ident) => { + $crate::imp::arch::choose::syscall0($crate::imp::reg::nr(linux_raw_sys::general::$nr)) + }; + + ($nr:ident, $a0:expr) => { + $crate::imp::arch::choose::syscall1( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr) => { + $crate::imp::arch::choose::syscall2( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr) => { + $crate::imp::arch::choose::syscall3( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => { + $crate::imp::arch::choose::syscall4( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => { + $crate::imp::arch::choose::syscall5( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => { + $crate::imp::arch::choose::syscall6( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + $a5.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => { + $crate::imp::arch::choose::syscall7( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + $a5.into(), + $a6.into(), + ) + }; +} + +macro_rules! syscall_readonly { + ($nr:ident) => { + $crate::imp::arch::choose::syscall0_readonly($crate::imp::reg::nr( + linux_raw_sys::general::$nr, + )) + }; + + ($nr:ident, $a0:expr) => { + $crate::imp::arch::choose::syscall1_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr) => { + $crate::imp::arch::choose::syscall2_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr) => { + $crate::imp::arch::choose::syscall3_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => { + $crate::imp::arch::choose::syscall4_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => { + $crate::imp::arch::choose::syscall5_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => { + $crate::imp::arch::choose::syscall6_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + $a5.into(), + ) + }; + + ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => { + $crate::imp::arch::choose::syscall7_readonly( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + $a1.into(), + $a2.into(), + $a3.into(), + $a4.into(), + $a5.into(), + $a6.into(), + ) + }; +} + +#[cfg(feature = "runtime")] +macro_rules! syscall_noreturn { + ($nr:ident, $a0:expr) => { + $crate::imp::arch::choose::syscall1_noreturn( + $crate::imp::reg::nr(linux_raw_sys::general::$nr), + $a0.into(), + ) + }; +} |