221 lines
3.4 KiB
Plaintext
221 lines
3.4 KiB
Plaintext
# 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 = 0x400078
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78 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 = 0x167
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67 01 00 00 00 00 00 00
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# p_memsz: u64 = 0x167
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67 01 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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# Code segment (offset 0x40, virtual address 0x400000)
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#
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# _start=120:
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# ; alloca 0x1000 bytes on the stack
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# mov rbp, rsp
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48 89 e5
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# sub rsp, 0x10000, increase this if you want to read more than 0x10000 bytes
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48 81 ec 00 00 01 00
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# ; read 0x10000 bytes from stdin into the stack
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# .READ: (130)
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# xor rax, rax
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48 31 c0
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# mov edi, 0 (stdin)
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48 c7 c7 00 00 00 00
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# mov rsi, rsp
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48 89 e6
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# mov rdx, 0x10000, increase this if you want to read more than 0x10000 bytes
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48 c7 c2 00 00 01 00
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# syscall (sys_read)
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0f 05
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# cmp rax, 0
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48 83 f8 00
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# jle die
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0f 8e b3 00 00 00
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## (162)
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# ; end = r8
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# mov r8, rax
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49 89 c0
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# add r8, rsp
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49 01 e0
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# ; pos = r9
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# mov r9, rsp
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49 89 e1
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# ; dst = r10
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# mov r10, rsp
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49 89 e2
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# add r10, 0x0000
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49 81 c2 00 00 00 00
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# ; while (pos < end) {
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# ; .L0: (181)
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# cmp r9, r8
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4d 39 c1
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# jge .L3
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0f 8d 72 00 00 00
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# (190)
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#
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# ; if (*pos == '#') {
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# mov al , byte [r9]
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41 8a 41 00
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# cmp al, '\n'
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3c 0a
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# je .L2.1:
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0f 84 15 00 00 00
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# (202)
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# cmp al, '#'
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3c 23
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# jne .L1
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0f 85 15 00 00 00
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# ; while (*pos != '\n') pos++;
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# ; .L2: (210)
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# inc r9
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49 ff c1
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# cmp byte [r9], '\n'
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41 80 39 0a
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# jne .L2
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0f 85 f3 ff ff ff
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# .L2.1: (223)
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# inc r9
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49 ff c1
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# jmp .L0
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e9 ce ff ff ff
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# (231)
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# ; .L1: (231)
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# ; convert *pos to high word
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# mov al, byte [r9]
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41 8a 01
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# mov bl, al
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88 c3
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# sub bl, 'a'
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80 eb 61
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# add bl, 10
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80 c3 0a
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# sub al, '0'
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2c 30
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# cmp al, 10
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3c 0a
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# cmovge eax, ebx
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0f 43 c3
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# shl al, 4
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c0 e0 04
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# ; pos++
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# inc r9
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49 ff c1
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# ; convert *pos to low word
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# mov bl, byte [r9]
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41 8a 19
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# mov cl, bl
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88 d9
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# sub cl, 'a'
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80 e9 61
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# add cl, 10
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80 c1 0a
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# sub bl, '0'
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80 eb 30
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# cmp bl, 10
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80 fb 0a
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# cmovge ebx, ecx
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0f 4d d9
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# ; combine high and low word
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# or al, bl
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08 d8
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# ; write the byte to dst
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# mov byte [r10], al
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41 88 02
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# inc r10
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49 ff c2
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# inc r9
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49 ff c1
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# ; if (*pos++ == '\n') goto .L1;
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# cmp byte [r9], '\n'
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41 80 39 0a
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# je .L0
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0f 84 8d ff ff ff
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## (296)
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# inc r9
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49 ff c1
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# jmp .L1 ;
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e9 b7 ff ff ff
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## (304)
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# ; }
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# .L3: (304)
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# ; write the decoded bytes to stdout
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# mov rax, 1 (sys_write)
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48 c7 c0 01 00 00 00
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# mov rdi, 1 (stdout)
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48 c7 c7 01 00 00 00
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# mov rsi, rsp
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48 89 e6
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# add rsi, 0x000
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48 81 c6 00 00 00 00
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# mov rdx, r10
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4c 89 d2
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# sub rdx, rsi
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48 29 f2
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# syscall
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0f 05
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# jmp .READ ;
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e9 2d ff ff ff
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## (341)
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#
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# die: (341)
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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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# _start+215 |