Import and compile article 6.75HEADmaster

2 files changed, 156 insertions, 0 deletions

diff --git a/sos-code-article6.75/userland/Makefile b/sos-code-article6.75/userland/Makefile
new file mode 100644
index 0000000..35fd0e3
--- /dev/null
+++ b/sos-code-article6.75/userland/Makefile
@@ -0,0 +1,82 @@
+## 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
+CFLAGS  = -Wall -nostdinc -ffreestanding -I. -I..
+LDFLAGS = -Wl,--warn-common -nostdlib -Wl,-Tldscript.lds
+
+# Main target
+all: userprogs.kimg
+
+-include .mkvars
+
+
+PWD := $(shell pwd)
+
+# Programs generation
+$(PROGS):
+	$(CC) -static $(LDFLAGS) -o $@ $^
+
+# Generation of the libC
+libc.a: libc.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 { .rodata . : { " > .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$$i.kimg ;                                         \
+           echo "  _begin_userprog$$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*
diff --git a/sos-code-article6.75/userland/ldscript.lds b/sos-code-article6.75/userland/ldscript.lds
new file mode 100644
index 0000000..b0ee954
--- /dev/null
+++ b/sos-code-article6.75/userland/ldscript.lds
@@ -0,0 +1,74 @@
+/* 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. 
+*/
+
+/* We generate binary in the ELF format */
+OUTPUT_FORMAT("elf32-i386","elf32-i386","elf32-i386");
+
+/* The entry point of the program is _start (defined in crt.c) */
+ENTRY(_start)
+
+/* The architecture is i386 */
+OUTPUT_ARCH("i386")
+
+SECTIONS
+{
+    /* our program is loaded at 2G */
+    . = 0x80000000;
+
+    /* Beginning of the text section */
+    .text :
+    {   
+	/* This section includes the code */
+        *(.text*)
+	/* Defines the 'etext' and '_etext' at the end */
+        PROVIDE(etext = .);
+        PROVIDE(_etext = .);
+    }
+
+    /* Beginning of the data section */
+    .data . :
+    {   *(.data*) 
+        PROVIDE(edata = .);
+	PROVIDE(_edata = .);
+    }
+
+    /* Beginning of the read-only data section */
+    .rodata . :
+    {   *(.rodata*)
+        PROVIDE(erodata = .);
+        PROVIDE(_erodata = .);
+    }
+
+    /* Beginning of the BSS section (global uninitialized data) */
+    .bss SIZEOF(.rodata) + ADDR(.rodata) :
+    {   *(.bss)
+        *(COMMON)
+        PROVIDE(ebss = .);
+	PROVIDE(_ebss = .);
+    }
+
+    /* We don't care of the note, indent, comment, etc.. sections
+       generated by gcc */
+    /DISCARD/ :{
+                *(.note*)
+                *(.indent)
+                *(.comment)
+                *(.stab)
+                *(.stabstr)
+    }
+}