removed stddef.h and limits.h (come with the compiler header files)

added a stub stdint.h (only sometimes comes with the compiler)
added a guide on cross compiling
adapted to cross compilation, for now tcc works

24 files changed, 181 insertions, 50 deletions

diff --git a/README.CrossCompiling b/README.CrossCompiling
new file mode 100644
index 0000000..67b5957
--- /dev/null
+++ b/README.CrossCompiling
@@ -0,0 +1,138 @@
+Intro
+-----
+
+You can compile AbaOS from a 32-bit host or chroot (e.g. Arch32 chroot).
+But you have to be extremly careful nothing from the host creeps into
+the binaries.
+
+You can also create a cross-compilation environment. Not, we don't need
+a full fledged chain, linker and compiler is enough. AbaOs has a small
+integrated C library which is sufficient to build the kernel.
+
+gcc
+---
+
+mkdir -p $HOME/cross-compilers/gcc
+cd $HOME/cross-compilers/gcc
+wget https://ftp.gnu.org/gnu/binutils/binutils-2.28.tar.gz
+tar xf binutils-2.28.tar.gz
+mkdir binutils-build
+cd binutils-build
+../binutils-2.28/configure --target=i486-elf --prefix=$HOME/cross-compilers --disable-nls -v
+make all
+make check
+make install
+cd ..
+
+wget https://gmplib.org/download/gmp/gmp-6.1.2.tar.lz
+tar xf gmp-6.1.2.tar.lz
+mkdir gmp-build
+cd gmp-build
+../gmp-6.1.2/configure --build=i486-elf --host=i486-elf --prefix=$HOME/cross-compilers
+make all
+make check
+make install
+cd ..
+
+wget http://www.mpfr.org/mpfr-current/mpfr-3.1.5.tar.gz
+tar xf mpfr-3.1.5.tar.gz
+mkdir mpfr-build
+cd mpfr-build
+../mpfr-3.1.5/configure -build=i486-elf --host=i486-elf --prefix=$HOME/cross-compilers \
+	--with-gmp=$HOME/cross-compilers
+make all
+make check
+make install
+cd ..
+
+wget ftp://ftp.gnu.org/gnu/mpc/mpc-1.0.3.tar.gz
+tar xf mpc-1.0.3.tar.gz
+mkdir mpc-build
+cd mpc-build
+../mpc-1.0.3/configure --host=i486-elf --target=i486-elf \
+	--prefix=$HOME/cross-compilers \
+	--with-gmp=$HOME/cross-compilers \
+	--with-mpfr=$HOME/cross-compilers
+make all
+make check
+make install
+cd ..
+
+wget ftp://ftp.mpi-sb.mpg.de/pub/gnu/mirror/gcc.gnu.org/pub/gcc/releases/gcc-7.1.0/gcc-7.1.0.tar.gz
+tar zxf gcc-7.1.0.tar.gz
+mkdir gcc-build
+cd gcc-build
+../gcc-7.1.0/configure --target=i486-elf --prefix=$HOME/cross-compilers \
+	--with-gnu-as --with-gnu-ld \
+	--disable-nls --enable-languages=c --disable-libgcj --without-headers \
+	--with-gmp=$HOME/cross-compilers \
+	--with-mpfr=$HOME/cross-compilers \
+	--with-mpc=$HOME/cross-compilers
+make all-gcc
+make all-target-libgcc
+make install-gcc
+make install-target-libgcc
+
+tcc
+---
+
+mkdir -p $HOME/cross-compilers/tcc
+cd $HOME/cross-compilers/tcc
+wget https://ftp.gnu.org/gnu/binutils/binutils-2.28.tar.gz
+tar xf binutils-2.28.tar.gz
+mkdir binutils-build
+cd binutils-build
+../binutils-2.28/configure --target=i486-elf --prefix=$HOME/cross-compilers --disable-nls -v
+make all
+make check
+make install
+cd ..
+
+mkdir -p $HOME/cross-compilers/tcc
+cd $HOME/cross-compilers/tcc
+git clone git://repo.or.cz/tinycc.git
+cd tinycc
+./configure --cpu=i386 --enable-cross --prefix=$HOME/cross-compilers
+make
+cd ..
+
+setenv PATH "${PATH}:$HOME/cross-compilers"
+make clean all CC=i386-tcc LD=i486-elf-ld
+
+pcc
+---
+
+mkdir -p $HOME/cross-compilers/pcc
+cd $HOME/cross-compilers/pcc
+wget https://ftp.gnu.org/gnu/binutils/binutils-2.28.tar.gz
+tar xf binutils-2.28.tar.gz
+mkdir binutils-build
+cd binutils-build
+../binutils-2.28/configure --target=i486-unknown-linux-gnu --prefix=$HOME/cross-compilers --disable-nls -v
+make all
+make check
+make install
+cd ..
+
+mkdir -p $HOME/cross-compilers/pcc
+cvs -d :pserver:anonymous@pcc.ludd.ltu.se:/cvsroot co pcc-libs
+mkdir pcc-libs-build
+cd pcc-libs-build
+../pcc-libs/configure --target=i486-unknown-linux-gnu --prefix=$HOME/cross-compilers
+make
+make install
+cd ..
+
+cvs -d :pserver:anonymous@pcc.ludd.ltu.se:/cvsroot co pcc
+mkdir pcc-build
+cd pcc-build
+../pcc/configure --target=i486-unknown-linux-gnu --prefix=$HOME/cross-compilers
+make
+make install
+
+Links
+-----
+
+https://ftp.gnu.org/gnu/binutils/
+http://wiki.osdev.org/Target_Triplet
+http://wiki.osdev.org/GCC_Cross-Compiler
diff --git a/src/README b/src/README
index 7b1b51c..a1c75e4 100644
--- a/src/README
+++ b/src/README
@@ -65,10 +65,6 @@ libc
 
 Stub C library implementation.
 
-C library definitions
-* stddef.h - definition of NULL, size_t
-* limits.h - domain range constants like INT_MAX
-
 C library routines
 * string.c - string, memory functions
 * stdlib.c - UNIX standard library functions
diff --git a/src/drivers/video/vga.h b/src/drivers/video/vga.h
index 0947856..9a637a2 100644
--- a/src/drivers/video/vga.h
+++ b/src/drivers/video/vga.h
@@ -4,7 +4,7 @@
 #include <stdbool.h>
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 #include "interrupts.h"
 #include "port.h"
diff --git a/src/gui/composite_widget.c b/src/gui/composite_widget.c
index 743360f..07056c0 100644
--- a/src/gui/composite_widget.c
+++ b/src/gui/composite_widget.c
@@ -1,7 +1,7 @@
 #include "composite_widget.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 static composite_widget_vtable_t const composite_widget_vtable = {
 	{
diff --git a/src/gui/desktop.c b/src/gui/desktop.c
index 98fb900..9851b78 100644
--- a/src/gui/desktop.c
+++ b/src/gui/desktop.c
@@ -1,7 +1,7 @@
 #include "desktop.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 static desktop_vtable_t const desktop_vtable = {
 	{
diff --git a/src/gui/text_widget.c b/src/gui/text_widget.c
index 49c1be7..5e468c7 100644
--- a/src/gui/text_widget.c
+++ b/src/gui/text_widget.c
@@ -1,7 +1,7 @@
 #include "text_widget.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 static text_widget_vtable_t const text_widget_vtable = {
 	{
diff --git a/src/gui/widget.c b/src/gui/widget.c
index 3620761..58b03ef 100644
--- a/src/gui/widget.c
+++ b/src/gui/widget.c
@@ -1,7 +1,7 @@
 #include "widget.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 static widget_vtable_t const widget_vtable = {
 	widget_draw,
diff --git a/src/gui/window.c b/src/gui/window.c
index 80c0b6c..fd53920 100644
--- a/src/gui/window.c
+++ b/src/gui/window.c
@@ -1,7 +1,7 @@
 #include "window.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 static window_vtable_t const window_vtable = {
 	{
diff --git a/src/hardware/interrupts.h b/src/hardware/interrupts.h
index c325d4f..64040cb 100644
--- a/src/hardware/interrupts.h
+++ b/src/hardware/interrupts.h
@@ -1,7 +1,7 @@
 #ifndef INTERRUPTS_H
 #define INTERRUPTS_H
 
-#include <stdint.h>
+#include "stdint.h"
 
 #include "port.h"
 #include "tasks.h"
diff --git a/src/hardware/port.h b/src/hardware/port.h
index ec96d09..8203fea 100644
--- a/src/hardware/port.h
+++ b/src/hardware/port.h
@@ -1,7 +1,7 @@
 #ifndef PORT_H
 #define PORT_H
 
-#include <stdint.h>
+#include "stdint.h"
 
 typedef struct {
 	uint16_t number; // port number, e.g. 0x3d4 VGA index register
diff --git a/src/kernel/console.c b/src/kernel/console.c
index 8caefc8..04fb44f 100644
--- a/src/kernel/console.c
+++ b/src/kernel/console.c
@@ -1,7 +1,7 @@
 #include "console.h"
 
 #include "string.h"
-#include "stddef.h"
+#include <stddef.h>
 
 void console_init( console_t *console )
 {
diff --git a/src/kernel/kernel.c b/src/kernel/kernel.c
index 3be8758..a472cde 100644
--- a/src/kernel/kernel.c
+++ b/src/kernel/kernel.c
@@ -1,5 +1,5 @@
 #include <stdbool.h>
-#include <stdint.h>
+#include "stdint.h"
 #include <stdarg.h>
 
 #include "vgatext.h"
diff --git a/src/kernel/memorymanagement.h b/src/kernel/memorymanagement.h
index 647c05d..299fa4c 100644
--- a/src/kernel/memorymanagement.h
+++ b/src/kernel/memorymanagement.h
@@ -1,7 +1,8 @@
 #ifndef MEMORYMANAGEMENT_H
 #define MEMORYMANAGEMENT_H
 
-#include "stddef.h"
+#include <stddef.h>
+#include "stdint.h"
 
 typedef struct {
 	size_t offset;
diff --git a/src/kernel/tasks.h b/src/kernel/tasks.h
index dddf9bb..b982d13 100644
--- a/src/kernel/tasks.h
+++ b/src/kernel/tasks.h
@@ -1,7 +1,7 @@
 #ifndef TASKS_H
 #define TASKS_H
 
-#include <stdint.h>
+#include "stdint.h"
 
 #define TASK_STACK_SIZE 4096
 
diff --git a/src/libc/limits.h b/src/libc/limits.h
deleted file mode 100644
index 1fc4e37..0000000
--- a/src/libc/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef LIMITS_H
-#define LIMITS_H
-
-#define INT_MAX 2147483647
-#define INT_MIN -2147483648
-
-#endif // LIMITS_H
diff --git a/src/libc/setjmp.h b/src/libc/setjmp.h
index 5f987f1..4322124 100644
--- a/src/libc/setjmp.h
+++ b/src/libc/setjmp.h
@@ -1,7 +1,7 @@
 #ifndef SETJMP_H
 #define SETJMP_H
 
-#include <stdint.h>
+#include "stdint.h"
 
 // C99 states this should be an array so we can address it without
 // the & operator, see prototypes of setjmp and longjmp
diff --git a/src/libc/stddef.h b/src/libc/stddef.h
deleted file mode 100644
index 4333661..0000000
--- a/src/libc/stddef.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef STDDEF_H
-#define STDDEF_H
-
-#include <stdint.h>
-
-#define NULL ( (void *)0 )
-
-typedef uint32_t size_t;
-
-#endif /* STDDEF_H */
diff --git a/src/libc/stdint.h b/src/libc/stdint.h
new file mode 100644
index 0000000..e0f35b6
--- /dev/null
+++ b/src/libc/stdint.h
@@ -0,0 +1,15 @@
+#ifndef STDINT_H
+#define STDINT_H
+
+#if defined( __PCC__ ) || defined( __TINYC__ )
+// TODO: no stdint.h in pcc-libs/pcc or tcc, mock one, but this one is
+// most likely very incorrect
+typedef unsigned int uint32_t;
+typedef signed int int32_t;
+typedef unsigned short uint16_t;
+typedef signed short int16_t;
+typedef unsigned char uint8_t;
+typedef signed char int8_t;
+#endif
+
+#endif // STDINT_H
diff --git a/src/libc/stdio.c b/src/libc/stdio.c
index 631cfbb..87b70ef 100644
--- a/src/libc/stdio.c
+++ b/src/libc/stdio.c
@@ -1,5 +1,5 @@
 #include "stdio.h"
-#include "stddef.h"
+#include <stddef.h>
 #include "stdlib.h"
 #include "string.h"
 
diff --git a/src/libc/stdio.h b/src/libc/stdio.h
index 33d7946..58c80b1 100644
--- a/src/libc/stdio.h
+++ b/src/libc/stdio.h
@@ -3,7 +3,7 @@
 
 #include <stdarg.h>
 
-#include "stddef.h"
+#include <stddef.h>
 
 #ifdef OS_ABAOS
 #include "console.h"
diff --git a/src/libc/stdlib.c b/src/libc/stdlib.c
index 07eabd4..4fea56e 100644
--- a/src/libc/stdlib.c
+++ b/src/libc/stdlib.c
@@ -1,7 +1,7 @@
 #include <stdbool.h>
 #include "string.h"
 #include "stdlib.h"
-#include "stddef.h"
+#include <stddef.h>
 
 #include "kernel.h"
 
diff --git a/src/libc/stdlib.h b/src/libc/stdlib.h
index 5b2521f..f7cfc8c 100644
--- a/src/libc/stdlib.h
+++ b/src/libc/stdlib.h
@@ -1,7 +1,7 @@
 #ifndef STDLIB_H
 #define STDLIB_H
 
-#include "stddef.h"
+#include <stddef.h>
 
 #include "memorymanagement.h"
 
diff --git a/src/libc/string.h b/src/libc/string.h
index 6c0fa01..f078d48 100644
--- a/src/libc/string.h
+++ b/src/libc/string.h
@@ -1,7 +1,7 @@
 #ifndef STRING_H
 #define STRING_H
 
-#include "stddef.h"
+#include <stddef.h>
 
 void *memset( void *s, int c, size_t n );
 void *memmove( void *d, const void *s, size_t n );
diff --git a/tests/libc/Makefile b/tests/libc/Makefile
index 59fa715..d9d2927 100644
--- a/tests/libc/Makefile
+++ b/tests/libc/Makefile
@@ -1,48 +1,46 @@
 CC := gcc
 DEFINES = -DOS_LINUX
-INCLUDES = -I. -I../../src/libc -I../../src/kernel
+INCLUDES = -I. -I../../src/libc -I../../src/kernel -I/home/abaumann/cross-compilers/include
 CFLAGS := -std=c99 -m32 -ffreestanding -O0 -g -Wall -Werror $(INCLUDES) $(DEFINES)
-# tcc misses crt1.o from gcc?! and fails with _start symbol missing on -nostdlib,
-# this seems very wrong..
-# TODO: for now test sanity of library tests with gcc and enabling -nostdlib
-#LDFLAGS := -nostdlib
+LD := ld
+LDFLAGS := 
 NASMFLAGS := -f elf32
 NASM := nasm
 
 all: test
 
 test_strlcpy: test_strlcpy.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) -o test_strlcpy test_strlcpy.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_strlcpy test_strlcpy.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_strlcpy.o: test_strlcpy.c
 	$(CC) $(CFLAGS) -c -o test_strlcpy.o test_strlcpy.c
 
 test_strlcat: test_strlcat.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) $(LDFLAGS) -o test_strlcat test_strlcat.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_strlcat test_strlcat.o ../../src/libc/string.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_strlcat.o: test_strlcat.c
 	$(CC) $(CFLAGS) -c -o test_strlcat.o test_strlcat.c
 
 test_itoa: test_itoa.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) $(LDFLAGS) -o test_itoa test_itoa.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_itoa test_itoa.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_itoa.o: test_itoa.c ../../src/libc/stdlib.h
 	$(CC) $(CFLAGS) -c -o test_itoa.o test_itoa.c
 
 test_malloc: test_malloc.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) $(LDFLAGS) -o test_malloc test_malloc.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_malloc test_malloc.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_malloc.o: test_malloc.c ../../src/libc/stdlib.h
 	$(CC) $(CFLAGS) -c -o test_malloc.o test_malloc.c
 
 test_printf: test_printf.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) $(LDFLAGS) -o test_printf test_printf.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_printf test_printf.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_printf.o: test_printf.c ../../src/libc/stdlib.h
 	$(CC) $(CFLAGS) -c -o test_printf.o test_printf.c
 
 test_abort: test_abort.o ../../src/libc/stdlib.o ../../src/libc/stdio.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
-	$(CC) $(LDFLAGS) -o test_abort test_abort.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
+	$(LD) $(LDFLAGS) -o test_abort test_abort.o ../../src/libc/stdio.o ../../src/libc/stdlib.o ../../src/libc/string.o ../../src/kernel/memorymanagement.o kernel_stub.o kernel_stub_asm.o
 
 test_abort.o: test_abort.c ../../src/libc/stdlib.h
 	$(CC) $(CFLAGS) -c -o test_abort.o test_abort.c