change objdump

Makefile

@@ -2,7 +2,7 @@
 AS := nasm
 CC := clang
 LD := lld
-DAS := llvm-objdump
+DAS := objdump
 
 ifneq '$(AS_ENV)' ''
 AS := $(AS_ENV)

makfile

@@ -0,0 +1,87 @@
+
+AS := nasm
+CC := clang
+LD := lld
+DAS := objdump
+
+ifneq '$(AS_ENV)' ''
+AS := $(AS_ENV)
+endif
+$(info Using AS=$(AS))
+
+ifneq '$(CC_ENV)' ''
+CC := $(CC_ENV)
+endif
+$(info Using CC=$(CC))
+
+ifneq '$(LD_ENV)' ''
+LD := $(LD_ENV)
+endif
+$(info Using LD=$(LD))
+
+ifneq '$(DAS_ENV)' ''
+DAS := $(DAS_ENV)
+endif
+$(info Using DAS=$(DAS))
+
+INC_COMMON := inc
+MK := mk
+OUT := out
+
+C_FLAGS_ARCH_X86_64 := -mcmodel=kernel \
+                  -target x86_64-pc-none-elf \
+                  -mno-red-zone \
+                  -mno-mmx \
+                  -mno-sse \
+                  -mno-sse2 \
+                  -mno-sse3 \
+                  -mno-3dnow
+
+# generic freestanding cflags used for target
+# each submodule can append to this flag
+C_FLAGS =   -x c \
+			-g \
+            -c \
+            -O2 \
+			-std=c17 \
+			-Wall \
+			-Wextra \
+			-Wpedantic \
+			-Werror \
+			-ffreestanding \
+			-fno-pic \
+			-fno-stack-protector \
+			$(C_FLAGS_ARCH_X86_64) \
+			-I$(INC_COMMON) \
+			$(C_FLAGS_$(MOD))
+
+# generic asm flags used for target
+# each submodule can append to this flag
+AS_FLAGS =  -w+all \
+			-w+error \
+			-f elf64 \
+			-F dwarf \
+			-g \
+			-I$(INC_COMMON) \
+			$(AS_FLAGS_$(MOD))
+
+# generic pre-processing flags used for target
+PREP_FLAGS = -E \
+			 -xc\
+			 -P \
+			 -I$(INC_COMMON) \
+             $(C_FLAGS_$(MOD))
+
+# generic generate dependency flags used for target
+# each submodule can append to this flag
+GDEP_FLAGS = $(PREP_FLAGS) \
+			 -MMD \
+			 -MT $@
+
+MKDIR = mkdir -p $(dir $@)
+COMP = $(CC) $(C_FLAGS) -o $@ $<
+COMPAS = $(AS) $(AS_FLAGS) -o $@ $<
+PREP = $(CC) $(PREP_FLAGS) $< > $@
+GDEP = $(CC) $(GDEP_FLAGS) -MF $(addsuffix .d, $@) $< > /dev/null
+
+include Rules.top