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The LXR Cross Referencer for SOS

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001 ## Copyright (C) 2005  David Decotigny
002 ##
003 ## This program is free software; you can redistribute it and/or
004 ## modify it under the terms of the GNU General Public License
005 ## as published by the Free Software Foundation; either version 2
006 ## of the License, or (at your option) any later version.
007 ## 
008 ## This program is distributed in the hope that it will be useful,
009 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
010 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011 ## GNU General Public License for more details.
012 ## 
013 ## You should have received a copy of the GNU General Public License
014 ## along with this program; if not, write to the Free Software
015 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
016 ## USA. 
017 
018 CC=gcc
019 AR=ar
020 OBJCOPY=objcopy
021 CFLAGS  = -Wall -nostdinc -ffreestanding -I. -I..
022 LIBGCC := $(shell $(CC) -print-libgcc-file-name) # To benefit from FP/64bits artihm.
023 LDFLAGS = -Wl,--warn-common -nostdlib -Wl,-Tldscript.lds
024 
025 # Main target
026 all: userprogs.kimg
027 
028 -include .mkvars
029 
030 PROGS := init myprog1 myprog2 myprog3 myprog4 myprog5 myprog6 \
031          myprog7 myprog8 myprog9 myprog10 myprog11 myprog12   \
032          myprog13 myprog14 banner
033 
034 # Build dependencies of the programs
035 $(PROGS) : % : %.o crt.o libc.a
036 
037 PWD := $(shell pwd)
038 
039 # Programs generation
040 $(PROGS):
041         $(CC) -static $(LDFLAGS) -o $@ $^ $(LIBGCC)
042 
043 # Generation of the libC
044 libc.a: libc.o string.o stdarg.o debug.o
045 
046 # Create a program image to be integrated into the Kernel
047 userprogs.kimg: $(PROGS)
048         @echo "# Generating ELF images for inclusion into the kernel image: $@"
049         @echo "SECTIONS { .userprogs . : { " > .userprogs.lds
050         @i=0 ;                                                              \
051          for f in $^ ; do                                                   \
052            i=`expr $$i + 1` ;                                               \
053            echo "extern char _begin_userprog$$i, _end_userprog$$i;"         \
054                 > .userprog$$i.c ;                                          \
055            echo "char *_userprog"$$i"_entry[]" >> .userprog$$i.c ;          \
056            echo "  __attribute__((section(\".userprogs_table\")))"          \
057                 >> .userprog$$i.c ;                                         \
058            echo "  = { \"$$f\", &_begin_userprog$$i, &_end_userprog$$i };"  \
059                 >> .userprog$$i.c ;                                         \
060            $(CC) $(CFLAGS) -c .userprog$$i.c -o .userprog$$i.o ;            \
061            $(OBJCOPY) --add-section .userprog$$i=$$f .userprog$$i.o         \
062                 .userprog$$i.kimg ;                                         \
063            echo "  . = ALIGN(4096);" >> .userprogs.lds ;                    \
064            echo "  _begin_userprog$$i = .;" >> .userprogs.lds ;             \
065            echo "  .userprog$$i.kimg(.userprog$$i);" >> .userprogs.lds ;    \
066            echo "  _end_userprog$$i = .;" >> .userprogs.lds ;               \
067            echo "  .userprog$$i.kimg(.rodata); .userprog$$i.kimg(.data);"   \
068                 >> .userprogs.lds ;                                         \
069          done
070         @echo "  _userprogs_table = .; *(.userprogs_table) ; LONG(0);"      \
071                 >> .userprogs.lds
072         @echo "} /DISCARD/ : { *(.text) *(.data) *(.bss) } }"               \
073                 >> .userprogs.lds
074         @$(LD) -r -o $@ -T.userprogs.lds
075 
076 # Create libraries from object files
077 %.a:
078         $(AR) rcv $@ $^
079 
080 # Create objects from C source code
081 %.o: %.c
082         $(CC) -I$(PWD) -c $< $(CFLAGS) -o $@
083 
084 # Create objects from assembler (.S) source code
085 %.o: %.S
086         $(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@
087 
088 # Clean directory
089 clean:
090         $(RM) *.o *.a *~ $(PROGS) *.kimg
091         $(RM) .userprog*

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