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Add arm feature detection for FreeBSD #1007

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Add arm feature detection for FreeBSD #1007

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4 changes: 2 additions & 2 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -162,10 +162,10 @@ name = "ring"
[dependencies]
untrusted = { version = "0.9" }

[target.'cfg(any(target_arch = "x86",target_arch = "x86_64", all(any(target_arch = "aarch64", target_arch = "arm"), any(target_os = "android", target_os = "fuchsia", target_os = "linux", target_os = "windows"))))'.dependencies]
[target.'cfg(any(target_arch = "x86",target_arch = "x86_64", all(any(target_arch = "aarch64", target_arch = "arm"), any(target_os = "android", target_os = "freebsd", target_os = "fuchsia", target_os = "linux", target_os = "windows"))))'.dependencies]
spin = { version = "0.9.2", default-features = false, features = ["once"] }

[target.'cfg(any(target_os = "android", target_os = "linux"))'.dependencies]
[target.'cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))'.dependencies]
libc = { version = "0.2.100", default-features = false }
once_cell = { version = "1.8.0", default-features = false, features=["std"], optional = true }

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49 changes: 47 additions & 2 deletions src/cpu.rs
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Expand Up @@ -33,6 +33,7 @@ pub(crate) fn features() -> Features {
any(target_arch = "aarch64", target_arch = "arm"),
any(
target_os = "android",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "linux",
target_os = "windows"
Expand All @@ -56,6 +57,7 @@ pub(crate) fn features() -> Features {
any(target_arch = "aarch64", target_arch = "arm"),
any(
target_os = "android",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "linux",
target_os = "windows"
Expand All @@ -72,28 +74,57 @@ pub(crate) fn features() -> Features {

pub(crate) mod arm {
#[cfg(all(
any(target_os = "android", target_os = "linux"),
any(target_os = "android", target_os = "freebsd", target_os = "linux"),
any(target_arch = "aarch64", target_arch = "arm")
))]
pub fn setup() {
use libc::c_ulong;
#[cfg(target_os = "freebsd")]
use libc::{c_int, c_void};
#[cfg(target_os = "freebsd")]
extern crate std;

// XXX: The `libc` crate doesn't provide `libc::getauxval` consistently
// across all Android/Linux targets, e.g. musl.
#[cfg(any(target_os = "android", target_os = "linux"))]
extern "C" {
fn getauxval(type_: c_ulong) -> c_ulong;
}

#[cfg(target_os = "freebsd")]
extern "C" {
fn elf_aux_info(aux: c_int, buf: *mut c_void, buflen: c_int) -> c_int;
}

#[cfg(not(target_os = "freebsd"))]
const AT_HWCAP: c_ulong = 16;

#[cfg(target_os = "freebsd")]
const AT_HWCAP: c_int = 25;

#[cfg(target_arch = "aarch64")]
const HWCAP_NEON: c_ulong = 1 << 1;

#[cfg(target_arch = "arm")]
const HWCAP_NEON: c_ulong = 1 << 12;

#[cfg(not(target_os = "freebsd"))]
let caps = unsafe { getauxval(AT_HWCAP) };

#[cfg(target_os = "freebsd")]
let caps: c_ulong = 0;

#[cfg(target_os = "freebsd")]
{
let buffer: *mut c_void = {
let t: *const c_ulong = &caps;
t
} as *mut c_void;
unsafe {
let _ret = elf_aux_info(AT_HWCAP, buffer, std::mem::size_of_val(&caps) as i32);
}
}

// We assume NEON is available on AARCH64 because it is a required
// feature.
#[cfg(target_arch = "aarch64")]
Expand All @@ -110,12 +141,26 @@ pub(crate) mod arm {
#[cfg(target_arch = "arm")]
const OFFSET: c_ulong = 0;

#[cfg(target_arch = "arm")]
#[cfg(target_os = "freebsd")]
let buffer: *mut c_void = {
let t: *const c_ulong = &caps;
t
} as *mut c_void;

#[cfg(not(target_os = "freebsd"))]
let caps = {
const AT_HWCAP2: c_ulong = 26;
unsafe { getauxval(AT_HWCAP2) }
};

#[cfg(target_os = "freebsd")]
{
const AT_HWCAP2: c_int = 26;
unsafe {
let _ret = elf_aux_info(AT_HWCAP2, buffer, std::mem::size_of_val(&caps) as i32);
};
}

const HWCAP_AES: c_ulong = 1 << 0 + OFFSET;
const HWCAP_PMULL: c_ulong = 1 << 1 + OFFSET;
const HWCAP_SHA2: c_ulong = 1 << 3 + OFFSET;
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