1 files changed, 62 insertions, 0 deletions
diff --git a/vendor/rustix/src/imp/linux_raw/runtime/tls.rs b/vendor/rustix/src/imp/linux_raw/runtime/tls.rs
new file mode 100644
index 000000000..63eed9bbd
--- /dev/null
+++ b/vendor/rustix/src/imp/linux_raw/runtime/tls.rs
@@ -0,0 +1,62 @@
+#![allow(unsafe_code)]
+
+use super::super::c;
+use super::super::elf::*;
+use super::super::param::auxv::exe_phdrs_slice;
+use core::ptr::null;
+
+/// For use with [`set_thread_area`].
+///
+/// [`set_thread_area`]: crate::runtime::set_thread_area
+#[cfg(target_arch = "x86")]
+pub type UserDesc = linux_raw_sys::general::user_desc;
+
+pub(crate) fn startup_tls_info() -> StartupTlsInfo {
+    let mut base = null();
+    let mut tls_phdr = null();
+    let mut stack_size = 0;
+
+    let phdrs = exe_phdrs_slice();
+
+    // Safety: We assume the phdr array pointer and length the kernel provided
+    // to the process describe a valid phdr array.
+    unsafe {
+        for phdr in phdrs {
+            match (*phdr).p_type {
+                PT_PHDR => {
+                    base = phdrs
+                        .as_ptr()
+                        .cast::<u8>()
+                        .offset(-((*phdr).p_vaddr as isize))
+                }
+                PT_TLS => tls_phdr = phdr,
+                PT_GNU_STACK => stack_size = (*phdr).p_memsz,
+                _ => {}
+            }
+        }
+
+        StartupTlsInfo {
+            addr: base.cast::<u8>().add((*tls_phdr).p_vaddr).cast(),
+            mem_size: (*tls_phdr).p_memsz,
+            file_size: (*tls_phdr).p_filesz,
+            align: (*tls_phdr).p_align,
+            stack_size,
+        }
+    }
+}
+
+/// The values returned from [`startup_tls_info`].
+///
+/// [`startup_tls_info`]: crate::runtime::startup_tls_info
+pub struct StartupTlsInfo {
+    /// The base address of the TLS segment.
+    pub addr: *const c::c_void,
+    /// The size of the memory region.
+    pub mem_size: usize,
+    /// The size beyond which all memory is zero-initialized.
+    pub file_size: usize,
+    /// The required alignment for the TLS segment.
+    pub align: usize,
+    /// The requested minimum size for stacks.
+    pub stack_size: usize,
+}