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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 := 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 # Programs generation
038 $(PROGS):
039         $(CC) -static $(LDFLAGS) -o $@ $^ $(LIBGCC)
040 
041 # Generation of the libC
042 libc.a: libc.o string.o stdarg.o debug.o
043 
044 # Create a program image to be integrated into the Kernel
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 # Create libraries from object files
075 %.a:
076         $(AR) rcv $@ $^
077 
078 # Create objects from C source code
079 %.o: %.c
080         $(CC) -I$(PWD) -c $< $(CFLAGS) -o $@
081 
082 # Create objects from assembler (.S) source code
083 %.o: %.S
084         $(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@
085 
086 # Clean directory
087 clean:
088         $(RM) *.o *.a *~ $(PROGS) *.kimg
089         $(RM) .userprog*

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