snequeil

.gitignore

.exports
.o
snequeil
.swp
*~

makefile

.PHONY: clean

LD=ld
ASM=nasm
RM=rm

OUT=snequeil
SRC=$(OUT).asm
OBJ=$(OUT).o
THIS=makefile

LDFLAGS=-e snequeil -macosx_version_min 10.7 -pie -allow_stack_execute -bind_at_load 
AFLAGS=-fmacho64
RMFLAGS=-f

DEPS=/usr/lib/libSystem.dylib

snequeil: $(OBJ) $(THIS)
	@$(LD) $(LDFLAGS) $(DEPS) -o $(OUT) $(OBJ) 
	@echo Linked
	@size $(OUT)
   

snequeil.o: $(SRC) $(THIS)
	@$(ASM) $(AFLAGS) -o $(OBJ) $(SRC)
	@echo Assembled
	@size $(OBJ)

clean:
	@$(RM) $(RMFLAGS) $(OBJ) $(OUT)

table: libSystem.dylib.exports
	@dyldinfo -arch x86_64 -export /usr/lib/libSystem.dylib > libSystem.dylib.exports

snequeil.asm

global snequeil


section .text
   snequeil:
   mov rbp, rsp         ; overwrite rbp, (it's 0)
   sub rsp, 0x8         ; alloc space on main stack frame

   ; TODO

   add rsp, 0x8         ; clean main stack frame
   mov rax, 0x2000001   ; exit
   xor rdi, rdi         ; return 0
   syscall              ; poke