4 files changed, 131 insertions, 0 deletions
diff --git a/userspace/Makefile b/userspace/Makefile
new file mode 100644
index 0000000..2a286da
--- /dev/null
+++ b/userspace/Makefile
@@ -0,0 +1,14 @@
+#i686-elf-gcc test.c -L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/newlib/ -I/home/miguel/temp/fool-os-stuff/newlib-2.1.0/newlib/libc/include/ -L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/libgloss/libnosys/
+
+CC=i686-elf-gcc
+LD=i686-elf-ld
+
+CFLAGS=-I/home/miguel/temp/fool-os-stuff/newlib-2.1.0/newlib/libc/include
+LDFLAGS=-L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/newlib/ \
+	-L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/libgloss/libnosys/ \
+	-lnosys
+
+all: test.o crt0.o
+	${CC}  -T linker.ld ${LDFLAGS} test.o -Wl,--oformat,binary -o userprog
+clean:
+	-rm *.o *.out userprog
diff --git a/userspace/crt0.S b/userspace/crt0.S
new file mode 100644
index 0000000..9f7dab1
--- /dev/null
+++ b/userspace/crt0.S
@@ -0,0 +1,9 @@
+.global _start
+.extern main
+.extern exit
+_start:
+call main
+call _exit
+.wait:
+    hlt
+jmp .wait
diff --git a/userspace/linker.ld b/userspace/linker.ld
new file mode 100644
index 0000000..bfaae93
--- /dev/null
+++ b/userspace/linker.ld
@@ -0,0 +1,4 @@
+SECTIONS
+{
+    . = 0x80800;
+}
diff --git a/userspace/test.c b/userspace/test.c
new file mode 100644
index 0000000..bdc6da0
--- /dev/null
+++ b/userspace/test.c
@@ -0,0 +1,104 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+//printf needs following syscalls: sbrk write close fstat isatty lseek read
+//
+
+#include <sys/stat.h>
+
+int close(int file) 
+{
+   return -1;
+}
+
+int fstat(int file, struct stat *st)
+{
+    st->st_mode = S_IFCHR;
+    return 0;
+}
+
+int isatty(int file) {
+    return 1;
+}
+
+int lseek(int file, int ptr, int dir) {
+    return 0;
+}
+
+int read(int file, char *ptr, int len) {
+    return 0;
+}
+
+int write(int file, char *ptr, int len) 
+{
+
+    int todo;
+    for (todo = 0; todo < len; todo++) 
+    {
+
+	char byte=(*ptr++);
+        int byt=byte;
+
+	int ebx; // will hold return value;
+	// system call 
+	asm("pusha");
+	asm("mov $61,%eax"); // select syscall)
+
+	asm("mov %0,%%edx"::"m"(byt));
+	//asm("mov $88,%edx");
+
+	asm("int $0x80"); // actual syscall ! interrupt
+        asm("mov %%ebx, %0": "=b" (ebx));
+	asm("popa");
+	//
+	
+    }
+    return len;
+}
+
+caddr_t sbrk(int incr) 
+{
+	    
+//            extern char _end;		/* Defined by the linker */
+	    char _end;
+            static char *heap_end;
+            char *prev_heap_end;
+          
+            if (heap_end == 0) {
+              heap_end = &_end;
+            }
+            prev_heap_end = heap_end;
+	    /*
+            if (heap_end + incr > stack_ptr) {
+              write (1, "Heap and stack collision\n", 25);
+              abort ();
+            }
+	    */
+          
+            heap_end += incr;
+            return (caddr_t) prev_heap_end;
+}
+
+//
+
+int main()
+{
+	int x=atoi("33");
+	int *mem=0x80000;
+	int *mem2=0x80010;
+
+	int y=0;
+	*mem=x;
+
+	while(1)
+	{
+	    printf("test printf");
+//	    write(1,"dupa",4);
+//	    y=example_call();
+	    y++;
+	    *mem2=y;
+	}
+    
+    
+}