mirror of
https://github.com/justinian/jsix.git
synced 2025-12-09 16:04:32 -08:00
c4bb60299e
This commit includes a number of changes to enable loading of PIE executables: - The loader in srv.init checks for a `PT_INTERP` segment in the program its loading, and if it exists, loads the specified interpreter and passes control to it instead of the program itself. - Added ld.so the dynamic linker executable and set it as the interpreter for all user-target programs. - Program initial stack changed again to now contain a number of possible tagged structures, including a new one for ld.so's arguments, and for passing handles tagged with protocol ids. - Added a stub for a new VFS protocol. Unused so far, but srv.init will need to serve VFS requests from ld.so once I transition libraries to shared libs for user-target programs. (Right now all executables are PIE but statically linked, so they only need internal relocations.) - Added 16 and 8 bit variants of `util::bitset`. This ended up not being used, but could be useful.
33 lines
701 B
ArmAsm
33 lines
701 B
ArmAsm
extern ldso_init
|
|
extern _GLOBAL_OFFSET_TABLE_
|
|
|
|
global _ldso_start:function hidden (_ldso_start.end - _ldso_start)
|
|
_ldso_start:
|
|
mov rbp, rsp
|
|
|
|
; Save off anything that might be a function arg
|
|
push rdi
|
|
push rsi
|
|
push rdx
|
|
push rcx
|
|
push r8
|
|
push r9
|
|
|
|
; Call ldso_init with the loader-provided stack data and
|
|
; also the address of the GOT, since clang refuses to take
|
|
; the address of it, only dereference it.
|
|
mov rdi, rbp
|
|
lea rsi, [rel _GLOBAL_OFFSET_TABLE_]
|
|
call ldso_init
|
|
; The real program's entrypoint is now in rax
|
|
|
|
; Put the function call params back
|
|
pop r9
|
|
pop r8
|
|
pop rcx
|
|
pop rdx
|
|
pop rsi
|
|
pop rdi
|
|
|
|
jmp rax
|
|
.end: |