1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs b/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs
new file mode 100644
index 000000000..1597fd727
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs
@@ -0,0 +1,74 @@
+//! Linux auxv support, using libc.
+//!
+//! # Safety
+//!
+//! This uses raw pointers to locate and read the kernel-provided auxv array.
+#![allow(unsafe_code)]
+
+#[cfg(any(feature = "param", feature = "runtime"))]
+use super::super::c;
+use super::super::elf::*;
+#[cfg(feature = "param")]
+use crate::ffi::CStr;
+#[cfg(feature = "runtime")]
+use core::slice;
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn page_size() -> usize {
+    unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn clock_ticks_per_second() -> u64 {
+    unsafe { libc::getauxval(libc::AT_CLKTCK) as u64 }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_hwcap() -> (usize, usize) {
+    unsafe {
+        (
+            libc::getauxval(libc::AT_HWCAP) as usize,
+            libc::getauxval(libc::AT_HWCAP2) as usize,
+        )
+    }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_execfn() -> &'static CStr {
+    unsafe {
+        let execfn = libc::getauxval(libc::AT_EXECFN) as *const c::c_char;
+        CStr::from_ptr(execfn.cast())
+    }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn exe_phdrs() -> (*const c::c_void, usize) {
+    unsafe {
+        (
+            libc::getauxval(libc::AT_PHDR) as *const c::c_void,
+            libc::getauxval(libc::AT_PHNUM) as usize,
+        )
+    }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(in super::super) fn exe_phdrs_slice() -> &'static [Elf_Phdr] {
+    let (phdr, phnum) = exe_phdrs();
+
+    // Safety: We assume the `AT_PHDR` and `AT_PHNUM` values provided by the
+    // kernel form a valid slice.
+    unsafe { slice::from_raw_parts(phdr.cast(), phnum) }
+}
+
+/// `AT_SYSINFO_EHDR` isn't present on all platforms in all configurations,
+/// so if we don't see it, this function returns a null pointer.
+#[inline]
+pub(in super::super) fn sysinfo_ehdr() -> *const Elf_Ehdr {
+    unsafe { libc::getauxval(linux_raw_sys::general::AT_SYSINFO_EHDR.into()) as *const Elf_Ehdr }
+}