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decode CIE

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This commit is contained in:
nora 2023-06-14 21:07:07 +02:00
parent e3246ede0b
commit c4dd3a7153
5 changed files with 194 additions and 37 deletions
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17
src/dwarf/divination.rs
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@ -23,6 +23,7 @@ struct dl_find_object {
dlfo_map_start: *const ffi::c_void,
dlfo_map_end: *const ffi::c_void,
dlf_link_map: *const ffi::c_void,
/// A pointer to the `PT_GNU_EH_FRAME` segment (the `.eh_frame_hdr` section).
dlfo_eh_frame: *const ffi::c_void,
}
@ -30,12 +31,6 @@ extern "C" {
fn _dl_find_object(address: *const ffi::c_void, result: *mut dl_find_object) -> ffi::c_int;
}
#[derive(Debug, Clone, Copy)]
pub struct DwarfInfo {
/// A pointer to the `PT_GNU_EH_FRAME` segment (the `.eh_frame_hdr` section).
pub(crate) eh_frame_hdr: *const u8,
}
/// The `.eh_frame_hdr` section.
/// See <https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/ehframehdr.html>
/// and <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html>.
@ -78,7 +73,7 @@ fn eh_frame_hdr_ptr(addr: Addr) -> Option<*const EhFrameHeader> {
}
}
pub(crate) fn dwarf_info(addr: Addr) -> Option<DwarfInfo> {
pub(crate) fn eh_frame(addr: Addr) -> Option<*const u8> {
unsafe {
let ptr = eh_frame_hdr_ptr(addr)?;
let header = ptr.read();
@ -99,10 +94,12 @@ pub(crate) fn dwarf_info(addr: Addr) -> Option<DwarfInfo> {
trace!(
"eh_frame start: {:x?}",
core::slice::from_raw_parts(eh_frame_ptr as *const u8, 10)
core::slice::from_raw_parts(eh_frame_ptr as *const u8, 15)
);
crate::stdext::abort();
crate::dwarf::uwutables(eh_frame_ptr as *const u8);
Some(eh_frame_ptr as *const u8)
}
}
@ -118,8 +115,6 @@ unsafe fn read_encoded(ptr: *const u8, encoding: Encoding) -> (*const u8, usize)
ValueFormat::DW_EH_PE_sdata8 => (ptr.add(8), ptr.cast::<i64>().read_unaligned() as usize),
};
trace!("{ptr:p}, {value}");
let value = match encoding.application() {
ValueApplication::DW_EH_PE_absptr => value,
ValueApplication::DW_EH_PE_pcrel => ((value as isize) + (ptr as isize)) as usize,