## Copyright (C) 2005  David Decotigny
 ##
 ## This program is free software; you can redistribute it and/or
 ## modify it under the terms of the GNU General Public License
 ## as published by the Free Software Foundation; either version 2
 ## of the License, or (at your option) any later version.
 ## 
 ## This program is distributed in the hope that it will be useful,
 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ## GNU General Public License for more details.
 ## 
 ## You should have received a copy of the GNU General Public License
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 ## USA. 
 
 CC=gcc
 AR=ar
 OBJCOPY=objcopy
 CFLAGS  = -Wall -nostdinc -ffreestanding -I. -I..
 LIBGCC := $(shell $(CC) -print-libgcc-file-name) # To benefit from FP/64bits artihm.
 LDFLAGS = -Wl,--warn-common -nostdlib -Wl,-Tldscript.lds
 
 # Main target
 all: userprogs.kimg
 
 -include .mkvars
 
 PROGS := init myprog1 myprog2 myprog3 myprog4 myprog5 myprog6 \
          myprog7 myprog8 myprog9 myprog10 myprog11 myprog12   \
          myprog13 myprog14 banner
 
 # Build dependencies of the programs
 $(PROGS) : % : %.o crt.o libc.a
 
 PWD := $(shell pwd)
 
 # Programs generation
 $(PROGS):
         $(CC) -static $(LDFLAGS) -o $@ $^ $(LIBGCC)
 
 # Generation of the libC
 libc.a: libc.o string.o stdarg.o debug.o
 
 # Create a program image to be integrated into the Kernel
 userprogs.kimg: $(PROGS)
         @echo "# Generating ELF images for inclusion into the kernel image: $@"
         @echo "SECTIONS { .userprogs . : { " > .userprogs.lds
         @i=0 ;                                                              \
          for f in $^ ; do                                                   \
            i=`expr $$i + 1` ;                                               \
            echo "extern char _begin_userprog$$i, _end_userprog$$i;"         \
                 > .userprog$$i.c ;                                          \
            echo "char *_userprog"$$i"_entry[]" >> .userprog$$i.c ;          \
            echo "  __attribute__((section(\".userprogs_table\")))"          \
                 >> .userprog$$i.c ;                                         \
            echo "  = { \"$$f\", &_begin_userprog$$i, &_end_userprog$$i };"  \
                 >> .userprog$$i.c ;                                         \
            $(CC) $(CFLAGS) -c .userprog$$i.c -o .userprog$$i.o ;            \
            $(OBJCOPY) --add-section .userprog$$i=$$f .userprog$$i.o         \
                 .userprog$$i.kimg ;                                         \
            echo "  . = ALIGN(4096);" >> .userprogs.lds ;                    \
            echo "  _begin_userprog$$i = .;" >> .userprogs.lds ;             \
            echo "  .userprog$$i.kimg(.userprog$$i);" >> .userprogs.lds ;    \
            echo "  _end_userprog$$i = .;" >> .userprogs.lds ;               \
            echo "  .userprog$$i.kimg(.rodata); .userprog$$i.kimg(.data);"   \
                 >> .userprogs.lds ;                                         \
          done
         @echo "  _userprogs_table = .; *(.userprogs_table) ; LONG(0);"      \
                 >> .userprogs.lds
         @echo "} /DISCARD/ : { *(.text) *(.data) *(.bss) } }"               \
                 >> .userprogs.lds
         @$(LD) -r -o $@ -T.userprogs.lds
 
 # Create libraries from object files
 %.a:
         $(AR) rcv $@ $^
 
 # Create objects from C source code
 %.o: %.c
         $(CC) -I$(PWD) -c $< $(CFLAGS) -o $@
 
 # Create objects from assembler (.S) source code
 %.o: %.S
         $(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@
 
 # Clean directory
 clean:
         $(RM) *.o *.a *~ $(PROGS) *.kimg
         $(RM) .userprog*