diff options
| -rw-r--r-- | Makefile | 54 | ||||
| -rw-r--r-- | src/c_bsdsetsid.S | 16 | ||||
| -rw-r--r-- | src/u_write.S | 14 |
3 files changed, 84 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..2d5df69 --- /dev/null +++ b/Makefile @@ -0,0 +1,54 @@ +# ======================== +# ===== =============== +# ====== ================ +# ====== ================ +# ====== ==== ==== == +# ====== === == = = +# ====== === = == = +# = === === = == ==== +# = === === = == = = +# == ===== ==== == +# ======================== +# +# bsdsetsid: Makefile +# 2020-11-13 13:22 +# Joe +# +# BSD Makefile + +default: all + +SRCS_DIR := src/ +PREFIX := /usr/local/ +DESTDIR := + +SRCS := ${SRCS_DIR}c_bsdsetsid.S +SRCS += ${SRCS_DIR}u_write.S + +OBJS = ${SRCS:.S=.o} + +ASM ?= yasm +ASMFLAGS := -felf64 +ASMFLAGS += -pgas + +LD := ld.lld +LDFLAGS := + +NAME := bsdsetsid + +RM := rm -f + +.SUFFIXES: .S .o + +.S.o: + ${ASM} ${ASMFLAGS} -o ${.TARGET} ${.IMPSRC} + +${NAME}: ${OBJS} + ${LD} -o ${.TARGET} ${.ALLSRC} + +all: ${NAME} + +clean: + ${RM} ${OBJS} ${NAME} + +.PHONY: all clean diff --git a/src/c_bsdsetsid.S b/src/c_bsdsetsid.S new file mode 100644 index 0000000..abf5afb --- /dev/null +++ b/src/c_bsdsetsid.S @@ -0,0 +1,16 @@ +.data +str: + .asciz "a string\n" + +.text +.extern u_write +.globl _start + +_start: + movq $0x1, %rdi + leaq str, %rsi + movq $0x9, %rdx + callq u_write + movq $0x1, %rax + xorq %rdi, %rdi + syscall diff --git a/src/u_write.S b/src/u_write.S new file mode 100644 index 0000000..efd7b9c --- /dev/null +++ b/src/u_write.S @@ -0,0 +1,14 @@ +.text +.globl u_write + +u_write: + movq $0x4, %rax + syscall + movq %rax, %rcx + jc u_err + movq %rcx, %rax + retq + +u_err: + movq $0xffffffffffffffff, %rax + retq |