Anhad Singh
c286ad2868
In the next big refactor (next PR), all of the platform functionality used by both relibc and ld.so will be moved into a `platform`/`sysdeps` crate and then ld.so would be moved out of relibc and not link with it. I think doing it in a seperate PR would make it more managable, as when I did half of it, the diff was pretty huge and that way it would be easier to review too :) Signed-off-by: Anhad Singh <andypython@protonmail.com>
94 lines
1.5 KiB
Rust
94 lines
1.5 KiB
Rust
#![no_std]
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#![feature(linkage)]
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use core::arch::global_asm;
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#[cfg(target_arch = "aarch64")]
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global_asm!(
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"
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.globl _start
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_start:
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mov x0, sp
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and sp, x0, #0xfffffffffffffff0 //align sp
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bl relibc_ld_so_start
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# TODO: aarch64
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udf #0
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"
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);
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#[cfg(target_arch = "x86")]
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global_asm!(
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"
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.globl _start
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_start:
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push esp
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call relibc_ld_so_start
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pop esp
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# TODO: x86
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ud2
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"
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);
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#[cfg(target_arch = "x86_64")]
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global_asm!(
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"
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.globl _start
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_start:
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# rsi = _start + 5
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call 2f
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2: pop rsi
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# Save original stack and align stack to 16 bytes
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mov rbp, rsp
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and rsp, 0xFFFFFFFFFFFFFFF0
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# Call ld_so_start(stack, entry)
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mov rdi, rbp
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sub rsi, 5
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call relibc_ld_so_start
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# Restore original stack, clear registers, and jump to new start function
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mov rsp, rbp
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xor rcx, rcx
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xor rdx, rdx
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xor rdi, rdi
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xor rsi, rsi
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xor r8, r8
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xor r9, r9
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xor r10, r10
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xor r11, r11
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fninit
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jmp rax
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"
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);
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#[cfg(target_arch = "riscv64")]
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global_asm!(
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"
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.globl _start
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_start:
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mv a0, sp
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jal relibc_ld_so_start
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unimp
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"
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);
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#[no_mangle]
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pub unsafe extern "C" fn main(_argc: isize, _argv: *const *const i8) -> usize {
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// LD
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0x1D
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}
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#[linkage = "weak"]
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#[no_mangle]
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extern "C" fn relibc_panic(_pi: &::core::panic::PanicInfo) -> ! {
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loop {}
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}
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#[panic_handler]
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#[linkage = "weak"]
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#[no_mangle]
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pub unsafe fn rust_begin_unwind(pi: &::core::panic::PanicInfo) -> ! {
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relibc_panic(pi)
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}
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