S_FILES = $(wildcard *.s)
S_O_FILES = $(subst .s,.o,$(S_FILES))
EXE_FILES = $(subst .o,,$(S_O_FILES))
EXE_FILES_GDB = $(subst .o,.gdb,$(S_O_FILES))


AS = as -g
LD = ld

# Il faut probablement décommenter les 2 lignes suivantes sur un Mac
# AS = clang -g -c
# LD = clang -g -nostartfiles -nostdlib


instructions:
	@echo "utilisez la commande"
	@echo "  $ make FICHIER.gdb"
	@echo "pour compiler FICHIER.s et le lancer dans gdb"

all: $(EXE_FILES)

$(EXE_FILES):%: %.o
	# link to executable
	$(LD) $< -o $@

$(S_O_FILES):%.o: %.s
	# assemble code
	$(AS) $< -o $@

$(EXE_FILES_GDB):%.gdb: % gdb.init
	# run gdb
	@gdb --quiet                        \
		--init-command=gdb.init         \
		--eval-command="tbreak _start"  \
		--eval-command="tbreak main"    \
		--eval-command="run"            \
		$<
	@# NOTE: j'inclus un point d'arrêt sur main au cas où on essaie de faire le
	@# TP sur un mac, qui utilise visiblement "main" plutôt que "_start".

clean:
	rm -f *.o $(EXE_FILES) a.out gdb.init

gdb.init:
	@echo 'set disassembly-flavor intel'                               >> gdb.init
	@echo 'set pagination off'                                         >> gdb.init
	@echo 'set confirm off'                                            >> gdb.init
	@echo 'set history save on'                                        >> gdb.init
	@echo '# set style enabled on'                                     >> gdb.init
	@echo '# set print pretty on'                                      >> gdb.init
	@echo '# set print array on'                                       >> gdb.init
	@echo ''                                                           >> gdb.init
	@echo '# show stack values'                                        >> gdb.init
	@echo 'define ss'                                                  >> gdb.init
	@echo '  set $$i = $$arg0 - 1'                                     >> gdb.init
	@echo '  while $$i >= 0'                                           >> gdb.init
	@echo '    set $$p = $$rsp + $$i*8'                                >> gdb.init
	@echo '    set $$v = *(long *)($$p)'                               >> gdb.init
	@echo '    printf "@0x%016lx:  0x%016lx   %ld\\n", $$p, $$v, $$v'  >> gdb.init
	@echo '    set $$i = $$i - 1'                                      >> gdb.init
	@echo '  end'                                                      >> gdb.init
	@echo 'end'                                                        >> gdb.init
	@echo ''                                                           >> gdb.init
	@echo '# switch to source view'                                    >> gdb.init
	@echo 'define src'                                                 >> gdb.init
	@echo '  layout src'                                               >> gdb.init
	@echo '  layout regs'                                              >> gdb.init
	@echo '  focus regs'                                               >> gdb.init
	@echo 'end'                                                        >> gdb.init
	@echo ''                                                           >> gdb.init
	@echo '# switch to real assembly view'                             >> gdb.init
	@echo 'define asm'                                                 >> gdb.init
	@echo '  layout asm'                                               >> gdb.init
	@echo '  layout regs'                                              >> gdb.init
	@echo '  focus regs'                                               >> gdb.init
	@echo 'end'                                                        >> gdb.init
	@echo ''                                                           >> gdb.init
	@echo '# default to source view'                                   >> gdb.init
	@echo 'src'                                                        >> gdb.init

.PHONY: all clean instruction