diff options
Diffstat (limited to 'quine.asm')
| -rw-r--r-- | quine.asm | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/quine.asm b/quine.asm deleted file mode 100644 index 9823d93..0000000 --- a/quine.asm +++ /dev/null @@ -1,109 +0,0 @@ -; fasmg quine.asm quine - -macro mov.d target, source - match =eax?, target - db 0xB8 - dd source - else match =edi?, target - db 0xBF - dd source - else match =rax?, target - db 0x48, 0xC7, 0xC0 -; 48 eAX REX.W prefix -; (DEC is the 32-bit meaning, ignore it) -; eAX -> register identifier, -; width depends on operand -; REX.W -> set 64-bit operand mode -; c7 Grp 11^1A - MOV Ev, Iz -; immediate to register -; 1A -> bits 5,4,3 of ModR/M are opcode -; extension -; E -> modR/M byte to follow for operand -; v -> word of appropriate size -; I -> immediate data -; z -> 32-bit operand -; c0 ModR/M byte -; 0b11000000 -; 11 mod: always 11 -; 000 op/reg: Mov Ev, Iz -; 00x w absent -; 0 w (ignored) - dd source - else match =rdi, target - db 0x48, 0xC7, 0xC7 -; 7: 48 c7 c7 2a 00 00 00 mov $0x2a,%rdi -; 48 eAX REX.W prefix -; (DEC is the 32-bit meaning, ignore it) -; c7 Grp 11^1A - MOV Ev, Iz -; immediate to register -; 1A -> bits 5,4,3 of ModR/M are opcode -; extension -; Ev -> ModR/M to follow for 32-bit operand -; Iz -> Immediate data, 32-bits -; c7 ModR/M byte -; 0b11000111 -; 11 mod: always 11 -; 000 op/reg: Mov Ev, Iz -; 11x w present -; 1 w true; use EDI - dd source - end match -end macro - -macro syscall - db 0x0F, 0x05 -; 0f two-byte escape -; 05 syscall ^ o64 -end macro - - - - -org 0x08048000 - -elf_header: -; * denotes mandatory fields according to breadbox - db 0x7F, "ELF" ; *magic number - db 2 ; 64-bit - db 1 ; little-endian - db 1 ; ELF header format version 1 - db 0 ; System-V ABI - db 8 dup 0 ; (padding) - - dw 2 ; *executable - dw 0x3E ; *Intel x86-64 - dd 1 ; ELF format version - - dq _start ; *entry point - dq program_header - $$ ; *program header offset - dq 0 ; section header offset - dd 0 ; processor flags - dw elf_header_size - dw program_header_entry_size ; * - dw 1 ; *number of program header entries - dw 0 ; section header entry size - dw 0 ; number of section header entries - dw 0 ; section name string table index -elf_header_size = $ - elf_header - -program_header: - dd 1 ; *"loadable" segment type - dd 0x05 ; *read+execute permission - dq 0 ; *offset in file - dq $$ ; *virtual address - ; required, but can be anything, subject to - ; alignment - dq 0 ; physical address (ignored) - dq file_size ; *size in file - dq file_size ; *size in memory - dq 0 ; segment alignment - ; for relocation - will we be ASLR'd? -program_header_entry_size = $ - program_header - -_start: - mov.d eax, 60 - mov.d edi, 42 - syscall - -file_size = $ - $$ - |