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Merge pull request #4660 from roc-lang/linux-stub-lib

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Linux stub lib
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Folkert de Vries 2022-12-03 10:50:12 +01:00 • committed by GitHub
commit 24e4048cb5
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2 changed files with 64 additions and 11 deletions
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70
crates/linker/src/generate_dylib/elf64.rs
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@ -18,8 +18,8 @@ pub fn create_dylib_elf64(custom_names: &[String]) -> object::read::Result<Vec<u
writer.reserve_shstrtab_section_index(),
];
// we need this later, but must allocate it here
let soname = writer.add_dynamic_string(b"libapp.so");
let out_dynamic = [(elf::DT_SONAME, 1, Some(soname)), (elf::DT_NULL, 0, None)];
// Assign dynamic symbol indices.
let out_dynsyms: Vec<_> = custom_names
@ -34,26 +34,57 @@ pub fn create_dylib_elf64(custom_names: &[String]) -> object::read::Result<Vec<u
writer.reserve_file_header();
const PLACEHOLDER: u64 = 0xAAAAAAAAAAAAAAAA;
let mut program_headers = [
object::write::elf::ProgramHeader {
p_type: object::elf::PT_PHDR,
p_flags: object::elf::PF_R,
p_offset: 0x40,
p_vaddr: 0x40,
p_paddr: 0x40,
p_filesz: 0x188,
p_memsz: 0x188,
p_align: 1 << 3,
},
object::write::elf::ProgramHeader {
p_type: object::elf::PT_LOAD,
p_flags: object::elf::PF_R | object::elf::PF_W,
p_offset: 0,
p_vaddr: 0,
p_paddr: 0,
p_filesz: 0,
p_memsz: 0,
p_offset: PLACEHOLDER,
p_vaddr: PLACEHOLDER,
p_paddr: PLACEHOLDER,
p_filesz: PLACEHOLDER,
p_memsz: PLACEHOLDER,
p_align: 1 << 12,
},
object::write::elf::ProgramHeader {
p_type: object::elf::PT_DYNAMIC,
p_flags: object::elf::PF_R | object::elf::PF_W,
p_offset: PLACEHOLDER,
p_vaddr: PLACEHOLDER,
p_paddr: PLACEHOLDER,
p_filesz: PLACEHOLDER,
p_memsz: PLACEHOLDER,
p_align: 1 << 3,
},
object::write::elf::ProgramHeader {
p_type: object::elf::PT_GNU_RELRO,
p_flags: object::elf::PF_R,
p_offset: PLACEHOLDER,
p_vaddr: PLACEHOLDER,
p_paddr: PLACEHOLDER,
p_filesz: PLACEHOLDER,
p_memsz: PLACEHOLDER,
p_align: 1 << 1,
},
object::write::elf::ProgramHeader {
p_type: object::elf::PT_GNU_STACK,
p_flags: object::elf::PF_R,
p_offset: 0,
p_vaddr: 0,
p_paddr: 0,
p_filesz: 0,
p_memsz: 0,
p_align: 1 << 3,
p_align: 0,
},
];
@ -65,6 +96,15 @@ pub fn create_dylib_elf64(custom_names: &[String]) -> object::read::Result<Vec<u
let dynstr_address = writer.reserved_len();
writer.reserve_dynstr();
let out_dynamic = [
(elf::DT_SONAME, 1, Some(soname)),
(elf::DT_SYMTAB, dynsym_address as u64, None),
(elf::DT_STRTAB, dynstr_address as u64, None),
(elf::DT_NULL, 0, None),
];
let dyn_size = std::mem::size_of::<elf::Dyn64<Endianness>>() * out_dynamic.len();
// aligned to the next multiple of 8
let dynamic_address = next_multiple_of(writer.reserved_len(), 8);
writer.reserve_dynamic(out_dynamic.len());
@ -77,12 +117,22 @@ pub fn create_dylib_elf64(custom_names: &[String]) -> object::read::Result<Vec<u
// just enough program header info to satisfy the dynamic loader
for program_header in program_headers.iter_mut() {
match program_header.p_type {
object::elf::PT_LOAD | object::elf::PT_DYNAMIC => {
elf::PT_LOAD | elf::PT_DYNAMIC | elf::PT_GNU_RELRO => {
program_header.p_offset = dynamic_address as u64;
program_header.p_vaddr = dynamic_address as u64 + 0x1000;
program_header.p_paddr = dynamic_address as u64 + 0x1000;
program_header.p_filesz = 0x8;
program_header.p_memsz = 0x8;
// this puts the dynamic section inside of the segments, so
//
// Section to Segment mapping:
// Segment Sections...
// 00
// 01 .dynamic
// 02 .dynamic
// 03 .dynamic
// 04
program_header.p_filesz = dyn_size as u64;
program_header.p_memsz = dyn_size as u64;
}
_ => {}
}