# SPDX-License-Identifier: GPL-2.0

  include ../scripts/Makefile.include

  prefix ?= /usr/local

  LEX = flex
  YACC = bison

  MAKE = make

  INSTALL ?= install

  CFLAGS += -Wall -O2

  CFLAGS += -D__EXPORTED_HEADERS__ -I$(srctree)/tools/include/uapi \
  	  -I$(srctree)/tools/include

  # This will work when bpf is built in tools env. where srctree
  # isn't set and when invoked from selftests build, where srctree
  # is set to ".". building_out_of_srctree is undefined for in srctree
  # builds

  ifeq ($(srctree),)
  update_srctree := 1
  endif

  ifndef building_out_of_srctree

  update_srctree := 1
  endif
  ifeq ($(update_srctree),1)

  srctree := $(patsubst %/,%,$(dir $(CURDIR)))
  srctree := $(patsubst %/,%,$(dir $(srctree)))
  endif

  ifeq ($(V),1)
    Q =
  else
    Q = @
  endif

  FEATURE_USER = .bpf
  FEATURE_TESTS = libbfd disassembler-four-args
  FEATURE_DISPLAY = libbfd disassembler-four-args
  
  check_feat := 1

  NON_CHECK_FEAT_TARGETS := clean bpftool_clean runqslower_clean resolve_btfids_clean

  ifdef MAKECMDGOALS
  ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
    check_feat := 0
  endif
  endif
  
  ifeq ($(check_feat),1)
  ifeq ($(FEATURES_DUMP),)
  include $(srctree)/tools/build/Makefile.feature
  else
  include $(FEATURES_DUMP)
  endif
  endif
  
  ifeq ($(feature-disassembler-four-args), 1)
  CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
  endif

  $(OUTPUT)%.yacc.c: $(srctree)/tools/bpf/%.y

  	$(QUIET_BISON)$(YACC) -o $@ -d $<

  $(OUTPUT)%.lex.c: $(srctree)/tools/bpf/%.l

  	$(QUIET_FLEX)$(LEX) -o $@ $<

  $(OUTPUT)%.o: $(srctree)/tools/bpf/%.c

  	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<

  
  $(OUTPUT)%.yacc.o: $(OUTPUT)%.yacc.c

  	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<

  $(OUTPUT)%.lex.o: $(OUTPUT)%.lex.c

  	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<

  PROGS = $(OUTPUT)bpf_jit_disasm $(OUTPUT)bpf_dbg $(OUTPUT)bpf_asm

  all: $(PROGS) bpftool runqslower

  $(OUTPUT)bpf_jit_disasm: CFLAGS += -DPACKAGE='bpf_jit_disasm'

  $(OUTPUT)bpf_jit_disasm: $(OUTPUT)bpf_jit_disasm.o

  	$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^ -lopcodes -lbfd -ldl

  $(OUTPUT)bpf_dbg: $(OUTPUT)bpf_dbg.o

  	$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^ -lreadline

  $(OUTPUT)bpf_asm: $(OUTPUT)bpf_asm.o $(OUTPUT)bpf_exp.yacc.o $(OUTPUT)bpf_exp.lex.o

  	$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^

  $(OUTPUT)bpf_exp.lex.c: $(OUTPUT)bpf_exp.yacc.c

  $(OUTPUT)bpf_exp.yacc.o: $(OUTPUT)bpf_exp.yacc.c
  $(OUTPUT)bpf_exp.lex.o: $(OUTPUT)bpf_exp.lex.c

  clean: bpftool_clean runqslower_clean resolve_btfids_clean

  	$(call QUIET_CLEAN, bpf-progs)

  	$(Q)$(RM) -r -- $(OUTPUT)*.o $(OUTPUT)bpf_jit_disasm $(OUTPUT)bpf_dbg \

  	       $(OUTPUT)bpf_asm $(OUTPUT)bpf_exp.yacc.* $(OUTPUT)bpf_exp.lex.*

  	$(call QUIET_CLEAN, core-gen)

  	$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpf
  	$(Q)$(RM) -r -- $(OUTPUT)feature

  install: $(PROGS) bpftool_install runqslower_install

  	$(call QUIET_INSTALL, bpf_jit_disasm)
  	$(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(prefix)/bin
  	$(Q)$(INSTALL) $(OUTPUT)bpf_jit_disasm $(DESTDIR)$(prefix)/bin/bpf_jit_disasm
  	$(call QUIET_INSTALL, bpf_dbg)
  	$(Q)$(INSTALL) $(OUTPUT)bpf_dbg $(DESTDIR)$(prefix)/bin/bpf_dbg
  	$(call QUIET_INSTALL, bpf_asm)
  	$(Q)$(INSTALL) $(OUTPUT)bpf_asm $(DESTDIR)$(prefix)/bin/bpf_asm

  
  bpftool:

  	$(call descend,bpftool)

  
  bpftool_install:

  	$(call descend,bpftool,install)

  
  bpftool_clean:

  	$(call descend,bpftool,clean)

  runqslower:
  	$(call descend,runqslower)
  
  runqslower_install:
  	$(call descend,runqslower,install)
  
  runqslower_clean:
  	$(call descend,runqslower,clean)

  resolve_btfids:
  	$(call descend,resolve_btfids)
  
  resolve_btfids_clean:
  	$(call descend,resolve_btfids,clean)

  .PHONY: all install clean bpftool bpftool_install bpftool_clean \

  	runqslower runqslower_install runqslower_clean \
  	resolve_btfids resolve_btfids_clean