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018 CC=gcc
019 AR=ar
020 OBJCOPY=objcopy
021 CFLAGS = -Wall -nostdinc -ffreestanding -I. -I..
022 LIBGCC := $(shell $(CC) -print-libgcc-file-name)
023 LDFLAGS = -Wl,--warn-common -nostdlib -Wl,-Tldscript.lds
024
025
026 all: userprogs.kimg
027
028 -include .mkvars
029
030 PROGS := myprog1 myprog2 myprog3 myprog4 myprog5 myprog6
031
032 # Build dependencies of the programs
033 $(PROGS) : % : %.o crt.o libc.a
034
035 PWD := $(shell pwd)
036
037
038 $(PROGS):
039 $(CC) -static $(LDFLAGS) -o $@ $^ $(LIBGCC)
040
041
042 libc.a: libc.o string.o stdarg.o debug.o
043
044
045 userprogs.kimg: $(PROGS)
046 @echo "# Generating ELF images for inclusion into the kernel image: $@"
047 @echo "SECTIONS { .userprogs . : { " > .userprogs.lds
048 @i=0 ; \
049 for f in $^ ; do \
050 i=`expr $$i + 1` ; \
051 echo "extern char _begin_userprog$$i, _end_userprog$$i;" \
052 > .userprog$$i.c ; \
053 echo "char *_userprog"$$i"_entry[]" >> .userprog$$i.c ; \
054 echo " __attribute__((section(\".userprogs_table\")))" \
055 >> .userprog$$i.c ; \
056 echo " = { \"$$f\", &_begin_userprog$$i, &_end_userprog$$i };" \
057 >> .userprog$$i.c ; \
058 $(CC) $(CFLAGS) -c .userprog$$i.c -o .userprog$$i.o ; \
059 $(OBJCOPY) --add-section .userprog$$i=$$f .userprog$$i.o \
060 .userprog$$i.kimg ; \
061 echo " . = ALIGN(4096);" >> .userprogs.lds ; \
062 echo " _begin_userprog$$i = .;" >> .userprogs.lds ; \
063 echo " .userprog$$i.kimg(.userprog$$i);" >> .userprogs.lds ; \
064 echo " _end_userprog$$i = .;" >> .userprogs.lds ; \
065 echo " .userprog$$i.kimg(.rodata); .userprog$$i.kimg(.data);" \
066 >> .userprogs.lds ; \
067 done
068 @echo " _userprogs_table = .; *(.userprogs_table) ; LONG(0);" \
069 >> .userprogs.lds
070 @echo "} /DISCARD/ : { *(.text) *(.data) *(.bss) } }" \
071 >> .userprogs.lds
072 @$(LD) -r -o $@ -T.userprogs.lds
073
074
075 %.a:
076 $(AR) rcv $@ $^
077
078
079 %.o: %.c
080 $(CC) -I$(PWD) -c $< $(CFLAGS) -o $@
081
082
083 %.o: %.S
084 $(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@
085
086
087 clean:
088 $(RM) *.o *.a *~ $(PROGS) *.kimg
089 $(RM) .userprog*