hex1 assembly works
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7472eb1279
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SSH key fingerprint:
SHA256:bB1qbbqmDXZNT0KKD5c2Dfjg53JGhj7B3CFcLIzSqq8
90
stages/hex0/helloworld.h1
Normal file
90
stages/hex0/helloworld.h1
Normal file
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@ -0,0 +1,90 @@
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; ELF header
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; e_ident: u128
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; Magic number: 0x7f454c46 = "\x7fELF"
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7f 45 4c 46
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; EI_CLASS: u8 = ELFCLASS64
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02
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; EI_DATA: u8 = ELFDATA2LSB
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01
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; EI_VERSION: u8 = EV_CURRENT
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01
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; EI_OSABI: u8 = ELFOSABI_NONE
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00
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; EI_ABIVERSION: u8 = 0
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00
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; EI_PAD: [u8; 7]
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00 00 00 00 00 00 00
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; e_type: u16 = E_EXEC
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02 00
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; e_machine: u16 = EM_X86_64
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3e 00
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; e_version: u32 = EV_CURRENT
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01 00 00 00
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; e_entry: u64 = 0x400084
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84 00 40 00 00 00 00 00
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; e_phoff: u64 = 0x40
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40 00 00 00 00 00 00 00
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; e_shoff: u64 = 0x0
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00 00 00 00 00 00 00 00
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; e_flags: u32 = 0
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00 00 00 00
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; e_ehsize: u16 = 64
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40 00
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; e_phentsize: u16 = 56
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38 00
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; e_phnum: u16 = 1
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01 00
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; e_shentsize: u16 = 0
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00 00
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; e_shnum: u16 = 0
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00 00
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; e_shstrndx: u16 = 0
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00 00
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; End of ELF header
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;
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; Program header
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; p_type: u32 = PT_LOAD
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01 00 00 00
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; p_flags: u32 = PF_R | PF_X
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05 00 00 00
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; p_offset: u64 = 0
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00 00 00 00 00 00 00 00
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; p_vaddr: u64 = 0x400000
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00 00 40 00 00 00 00 00
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; p_paddr: u64 = 0x0
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00 00 00 00 00 00 00 00
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; p_filesz: u64
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ae 00 00 00 00 00 00 00
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; p_memsz: u64
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ae 00 00 00 00 00 00 00
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; p_align: u64 = 0x1000
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00 10 00 00 00 00 00 00
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; End of program header
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;
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; Ehdr size = 64 = 0x40
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; Phdr size = 56 = 0x38
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; .text size = 54 = 0x36
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; total 0xae
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;
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; Code segment
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;
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; _start
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@hello_world:
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68 65 6c 6c 6f 20 77 6f 72 6c 64 21
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@_start:
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; mov rax, 1
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48 c7 c0 01 00 00 00
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; mov rdi, 1
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48 c7 c7 01 00 00 00
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; mov rsi, [@hello_world]
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48 8d 35 'hello_world
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; mov rdx, 12
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48 c7 c2 0c 00 00 00
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; syscall
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0f 05
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; mov rax, 60 (sys_exit)
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48 c7 c0 3c 00 00 00
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; xor rdi, rdi
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48 31 ff
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; syscall
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0f 05
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@ -199,59 +199,6 @@ get_next_token:
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call skip_comment
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jmp get_next_token
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;; read the label into scratch, call push_lbl
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label:
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cmp al, '@'
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jne .not_label
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xor rsi, rsi ; rsi = length of label
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.label_loop:
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push rsi
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call rd_buf
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pop rsi
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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cmp al, ':'
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je .label_ret
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mov byte [rdi + rsi], al
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inc rsi
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jmp .label_loop
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.label_ret:
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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call push_lbl
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.not_label:
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ret
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label_ref:
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cmp al, "'"
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jne .not_label_ref
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call rd_buf
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xor rsi, rsi ; rsi = length of label
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.label_ref_loop:
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push rsi
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call rd_buf
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pop rsi
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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cmp al, ' '
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je .label_ref_ret
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cmp al, `\t`
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je .label_ref_ret
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cmp al, `\n`
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je .label_ref_ret
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mov byte [rdi + rsi], al
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inc rsi
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jmp .label_ref_loop
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.label_ref_ret:
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lea rdi, [r15 + 0x6004]
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call find_lbl
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add dword [r15 + 0x500c], 4 ; advance the file offset by 4
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sub eax, dword [r15 + 0x500c] ; add current file offset
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mov edi, dword [r15 + 0x5004] ; get current write cursor
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mov dword [r15 + 0x1000 + rdi], eax ; write the opcode for jmp rel32
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add dword [r15 + 0x5004], 4 ; advance the write cursor by 4
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.not_label_ref:
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ret
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char_to_u4:
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cmp al, '0'
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jb .invalid_hex
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@ -296,6 +243,62 @@ octet:
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add rsp, 8
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ret
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label_ref:
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cmp al, "'"
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jne .not_label_ref
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xor rsi, rsi ; rsi = length of label
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.label_ref_loop:
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push rsi
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call rd_buf
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pop rsi
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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cmp al, ' '
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je .label_ref_ret
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cmp al, `\t`
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je .label_ref_ret
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cmp al, `\n`
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je .label_ref_ret
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mov byte [rdi + rsi], al
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inc rsi
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jmp .label_ref_loop
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.label_ref_ret:
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lea rdi, [r15 + 0x6004]
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call find_lbl
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add dword [r15 + 0x500c], 4 ; advance the file offset by 4
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sub eax, dword [r15 + 0x500c] ; add current file offset
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mov edi, dword [r15 + 0x5004] ; get current write cursor
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mov dword [r15 + 0x1000 + rdi], eax ; write the opcode for jmp rel32
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add dword [r15 + 0x5004], 4 ; advance the write cursor by 4
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ret
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.not_label_ref:
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call octet
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ret
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;; read the label into scratch, call push_lbl
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label:
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cmp al, '@'
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jne .not_label
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xor rsi, rsi ; rsi = length of label
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.label_loop:
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push rsi
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call rd_buf
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pop rsi
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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cmp al, ':'
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je .label_ret
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mov byte [rdi + rsi], al
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inc rsi
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jmp .label_loop
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.label_ret:
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lea rdi, [r15 + 0x6004] ; rdi = pointer to scratch
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call push_lbl
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ret
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.not_label:
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call label_ref
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ret
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global _start
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_start:
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push rbp
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@ -312,8 +315,4 @@ _start:
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call rd_buf
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call get_next_token
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call label
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call label_ref
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call octet
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jmp .loop
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