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- Use `loadquery` to get loaded libraries - Use object crate to parse XCOFF and get image information
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Kai Luo
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Aug 23, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| use super::mystd::borrow::ToOwned; | ||
| use super::mystd::env; | ||
| use super::mystd::ffi::{CStr, OsStr}; | ||
| use super::mystd::io::Error; | ||
| use super::mystd::os::unix::prelude::*; | ||
| use super::xcoff; | ||
| use super::{Library, LibrarySegment, Vec}; | ||
| use alloc::vec; | ||
| use core::mem; | ||
|
|
||
| const EXE_IMAGE_BASE: u64 = 0x100000000; | ||
|
|
||
| /// On AIX, we use `loadquery` with `L_GETINFO` flag to query libraries mmapped. | ||
| /// See https://www.ibm.com/docs/en/aix/7.2?topic=l-loadquery-subroutine for | ||
| /// detailed information of `loadquery`. | ||
| pub(super) fn native_libraries() -> Vec<Library> { | ||
| let mut ret = Vec::new(); | ||
| unsafe { | ||
| let mut buffer = vec![mem::zeroed::<libc::ld_info>(); 64]; | ||
| loop { | ||
| if libc::loadquery( | ||
| libc::L_GETINFO, | ||
| buffer.as_mut_ptr() as *mut libc::c_char, | ||
| (mem::size_of::<libc::ld_info>() * buffer.len()) as u32, | ||
| ) != -1 | ||
| { | ||
| break; | ||
| } else { | ||
| match Error::last_os_error().raw_os_error() { | ||
| Some(libc::ENOMEM) => { | ||
| buffer.resize(buffer.len() * 2, mem::zeroed::<libc::ld_info>()); | ||
| } | ||
| Some(_) => { | ||
| // If other error occurs, return empty libraries. | ||
| return Vec::new(); | ||
| } | ||
| _ => unreachable!(), | ||
| } | ||
| } | ||
| } | ||
| let mut current = buffer.as_mut_ptr(); | ||
| loop { | ||
| let text_base = (*current).ldinfo_textorg as usize; | ||
| let filename_ptr: *const libc::c_char = &(*current).ldinfo_filename[0]; | ||
| let bytes = CStr::from_ptr(filename_ptr).to_bytes(); | ||
| let member_name_ptr = filename_ptr.offset((bytes.len() + 1) as isize); | ||
| let mut filename = OsStr::from_bytes(bytes).to_owned(); | ||
| if text_base == EXE_IMAGE_BASE as usize { | ||
| if let Ok(exe) = env::current_exe() { | ||
| filename = exe.into_os_string(); | ||
| } | ||
| } | ||
| let bytes = CStr::from_ptr(member_name_ptr).to_bytes(); | ||
| let member_name = OsStr::from_bytes(bytes).to_owned(); | ||
| if let Some(image) = xcoff::parse_image(filename.as_ref(), &member_name) { | ||
| ret.push(Library { | ||
| name: filename, | ||
| member_name, | ||
| segments: vec![LibrarySegment { | ||
| stated_virtual_memory_address: image.base as usize, | ||
| len: image.size, | ||
| }], | ||
| bias: (text_base + image.offset).wrapping_sub(image.base as usize), | ||
| }); | ||
| } | ||
| if (*current).ldinfo_next == 0 { | ||
| break; | ||
| } | ||
| current = (current as *mut libc::c_char).offset((*current).ldinfo_next as isize) | ||
| as *mut libc::ld_info; | ||
| } | ||
| } | ||
| return ret; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,186 @@ | ||
| use super::mystd::ffi::{OsStr, OsString}; | ||
| use super::mystd::os::unix::ffi::OsStrExt; | ||
| use super::mystd::str; | ||
| use super::{gimli, Context, Endian, EndianSlice, Mapping, Path, Stash, Vec}; | ||
| use alloc::sync::Arc; | ||
| use core::ops::Deref; | ||
| use object::read::archive::ArchiveFile; | ||
| use object::read::xcoff::{FileHeader, SectionHeader, XcoffFile, XcoffSymbol}; | ||
| use object::Object as _; | ||
| use object::ObjectSection as _; | ||
| use object::ObjectSymbol as _; | ||
| use object::SymbolFlags; | ||
|
|
||
| #[cfg(target_pointer_width = "32")] | ||
| type Xcoff = object::xcoff::FileHeader32; | ||
| #[cfg(target_pointer_width = "64")] | ||
| type Xcoff = object::xcoff::FileHeader64; | ||
|
|
||
| impl Mapping { | ||
| pub fn new(path: &Path, member_name: &OsString) -> Option<Mapping> { | ||
| let map = super::mmap(path)?; | ||
| Mapping::mk(map, |data, stash| { | ||
| if member_name.is_empty() { | ||
| Context::new(stash, Object::parse(data)?, None, None) | ||
| } else { | ||
| let archive = ArchiveFile::parse(data).ok()?; | ||
| for member in archive | ||
| .members() | ||
| .filter_map(|m| m.ok()) | ||
| .filter(|m| OsStr::from_bytes(m.name()) == member_name) | ||
| { | ||
| let member_data = member.data(data).ok()?; | ||
| if let Some(obj) = Object::parse(member_data) { | ||
| return Context::new(stash, obj, None, None); | ||
| } | ||
| } | ||
| None | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| struct ParsedSym<'a> { | ||
| address: u64, | ||
| size: u64, | ||
| name: &'a str, | ||
| } | ||
|
|
||
| pub struct Object<'a> { | ||
| syms: Vec<ParsedSym<'a>>, | ||
| file: XcoffFile<'a, Xcoff>, | ||
| } | ||
|
|
||
| pub struct Image { | ||
| pub offset: usize, | ||
| pub base: u64, | ||
| pub size: usize, | ||
| } | ||
|
|
||
| pub fn parse_xcoff(data: &[u8]) -> Option<Image> { | ||
| let mut offset = 0; | ||
| let header = Xcoff::parse(data, &mut offset).ok()?; | ||
| let _ = header.aux_header(data, &mut offset).ok()?; | ||
| let sections = header.sections(data, &mut offset).ok()?; | ||
| if let Some(section) = sections.iter().find(|s| { | ||
| if let Ok(name) = str::from_utf8(&s.s_name()[0..5]) { | ||
| name == ".text" | ||
| } else { | ||
| false | ||
| } | ||
| }) { | ||
| Some(Image { | ||
| offset: section.s_scnptr() as usize, | ||
| base: section.s_paddr() as u64, | ||
| size: section.s_size() as usize, | ||
| }) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
|
|
||
| pub fn parse_image(path: &Path, member_name: &OsString) -> Option<Image> { | ||
| let map = super::mmap(path)?; | ||
| let data = map.deref(); | ||
| if member_name.is_empty() { | ||
| return parse_xcoff(data); | ||
| } else { | ||
| let archive = ArchiveFile::parse(data).ok()?; | ||
| for member in archive | ||
| .members() | ||
| .filter_map(|m| m.ok()) | ||
| .filter(|m| OsStr::from_bytes(m.name()) == member_name) | ||
| { | ||
| let member_data = member.data(data).ok()?; | ||
| if let Some(image) = parse_xcoff(member_data) { | ||
| return Some(image); | ||
| } | ||
| } | ||
| None | ||
| } | ||
| } | ||
|
|
||
| impl<'a> Object<'a> { | ||
| fn get_concrete_size(file: &XcoffFile<'a, Xcoff>, sym: &XcoffSymbol<'a, '_, Xcoff>) -> u64 { | ||
| match sym.flags() { | ||
| SymbolFlags::Xcoff { | ||
| n_sclass: _, | ||
| x_smtyp: _, | ||
| x_smclas: _, | ||
| containing_csect: Some(index), | ||
| } => { | ||
| if let Ok(tgt_sym) = file.symbol_by_index(index) { | ||
| Self::get_concrete_size(file, &tgt_sym) | ||
| } else { | ||
| 0 | ||
| } | ||
| } | ||
| _ => sym.size(), | ||
| } | ||
| } | ||
|
|
||
| fn parse(data: &'a [u8]) -> Option<Object<'a>> { | ||
| let file = XcoffFile::parse(data).ok()?; | ||
| let mut syms = file | ||
| .symbols() | ||
| .filter_map(|sym| { | ||
| let name = sym.name().map_or("", |v| v); | ||
| let address = sym.address(); | ||
| let size = Self::get_concrete_size(&file, &sym); | ||
| if name == ".text" || name == ".data" { | ||
| // We don't want to include ".text" and ".data" symbols. | ||
| // If they are included, since their ranges cover other | ||
| // symbols, when searching a symbol for a given address, | ||
| // ".text" or ".data" is returned. That's not what we expect. | ||
| None | ||
| } else { | ||
| Some(ParsedSym { | ||
| address, | ||
| size, | ||
| name, | ||
| }) | ||
| } | ||
| }) | ||
| .collect::<Vec<_>>(); | ||
| syms.sort_by_key(|s| s.address); | ||
| Some(Object { syms, file }) | ||
| } | ||
|
|
||
| pub fn section(&self, _: &Stash, name: &str) -> Option<&'a [u8]> { | ||
| Some(self.file.section_by_name(name)?.data().ok()?) | ||
| } | ||
|
|
||
| pub fn search_symtab<'b>(&'b self, addr: u64) -> Option<&'b [u8]> { | ||
| // Symbols, except ".text" and ".data", are sorted and are not overlapped each other, | ||
| // so we can just perform a binary search here. | ||
| let i = match self.syms.binary_search_by_key(&addr, |sym| sym.address) { | ||
| Ok(i) => i, | ||
| Err(i) => i.checked_sub(1)?, | ||
| }; | ||
| let sym = self.syms.get(i)?; | ||
| if (sym.address..sym.address + sym.size).contains(&addr) { | ||
| // On AIX, for a function call, for example, `foo()`, we have | ||
| // two symbols `foo` and `.foo`. `foo` references the function | ||
| // descriptor and `.foo` references the function entry. | ||
| // See https://www.ibm.com/docs/en/xl-fortran-aix/16.1.0?topic=calls-linkage-convention-function | ||
| // for more information. | ||
| // We trim the prefix `.` here, so that the rust demangler can work | ||
| // properly. | ||
| Some(sym.name.trim_start_matches(".").as_bytes()) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn search_object_map(&self, _addr: u64) -> Option<(&Context<'_>, u64)> { | ||
| None | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn handle_split_dwarf<'data>( | ||
| _package: Option<&gimli::DwarfPackage<EndianSlice<'data, Endian>>>, | ||
| _stash: &'data Stash, | ||
| _load: addr2line::SplitDwarfLoad<EndianSlice<'data, Endian>>, | ||
| ) -> Option<Arc<gimli::Dwarf<EndianSlice<'data, Endian>>>> { | ||
| None | ||
| } |
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