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ld: fix dwarf sections offset calculations

This commit is contained in:
occheung 2024-11-28 16:06:09 +08:00 committed by sb10q
parent babc081dbd
commit fce61f7b8c
1 changed files with 7 additions and 4 deletions
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11
nac3ld/src/dwarf.rs
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@ -90,6 +90,7 @@ impl<'a> DwarfReader<'a> {
pub fn read_u8(&mut self) -> u8 {
let val = self.slice[0];
self.slice = &self.slice[1..];
self.virt_addr += 1;
val
}
}
@ -101,6 +102,7 @@ macro_rules! impl_read_fn {
pub fn $byteorder_fn(&mut self) -> $type {
let val = LittleEndian::$byteorder_fn(self.slice);
self.slice = &self.slice[mem::size_of::<$type>()..];
self.virt_addr += mem::size_of::<$type>() as u32;
val
}
)*
@ -319,7 +321,7 @@ impl<'a> CFI_Record<'a> {
/// Returns a [DwarfReader] initialized to the first Frame Description Entry (FDE) of this CFI
/// record.
pub fn get_fde_reader(&self) -> DwarfReader<'a> {
DwarfReader::from_reader(&self.fde_reader, true)
DwarfReader::from_reader(&self.fde_reader, false)
}
/// Returns an [Iterator] over all Frame Description Entries (FDEs).
@ -396,6 +398,8 @@ impl<'a> Iterator for FDE_Records<'a> {
return None;
}
let fde_addr = self.reader.virt_addr;
// Remove the length of the header and the content from the counter
let length = match self.reader.read_u32() {
// eh_frame with 0-length means the CIE is terminated
@ -413,7 +417,7 @@ impl<'a> Iterator for FDE_Records<'a> {
let next_val = if cie_ptr != 0 {
let pc_begin = read_encoded_pointer_with_pc(&mut self.reader, self.pointer_encoding)
.expect("Failed to read PC Begin");
Some((pc_begin as u32, self.reader.virt_addr))
Some((pc_begin as u32, fde_addr))
} else {
None
};
@ -447,8 +451,7 @@ impl<'a> EH_Frame_Hdr<'a> {
writer.write_u8(0x3B); // table_enc - .eh_frame_hdr section-relative 4-byte signed value
let eh_frame_offset = eh_frame_addr.wrapping_sub(
eh_frame_hdr_addr + writer.offset as u32 + ((mem::size_of::<u8>() as u32) * 4),
);
eh_frame_hdr_addr + writer.offset as u32);
writer.write_u32(eh_frame_offset); // eh_frame_ptr
writer.write_u32(0); // `fde_count`, will be written in finalize_fde