Add XnoeOS's first non-kernel program. Test systemcalls

Makefile

@@ -2,12 +2,13 @@ CFLAGS = -g -std=gnu11 -m32 -mgeneral-regs-only -nostdlib -fno-builtin -fno-exce
 CXXFLAGS = -g -m32 -fno-use-cxa-atexit -mgeneral-regs-only -nostdlib -fno-builtin -fno-rtti -fno-exceptions -fno-leading-underscore -fpermissive -fno-pie -fno-stack-protector -I.
 LDFLAGS = 
 
-DISK_IMG_FILES = build/kernel/kernel.bin hello.txt alpha.txt
+DISK_IMG_FILES = build/kernel/kernel.bin build/program/program.bin hello.txt alpha.txt
 KERNEL_OBJS = build/kernel/entry.o build/kernel/screenstuff.o build/kernel/io.o build/kernel/idt.o build/kernel/keyboard.o \
 							build/kernel/strings.o build/kernel/atapio.o build/kernel/kmain.o build/kernel/paging.o build/kernel/allocate.o \
 							build/kernel/gdt.o build/kernel/memory.o build/kernel/process.o build/kernel/datatypes/hash.o \
 							build/kernel/terminal.o build/kernel/global.o build/kernel/kernel.o
-STAGE2_OBS = build/c_code_entry.o build/boot_stage2/io.o build/boot_stage2/atapio.o build/boot_stage2/strings.o build/boot_stage2/screenstuff.o build/boot_stage2/stage2.o build/boot_stage2/paging.o
+STAGE2_OBJS = build/c_code_entry.o build/boot_stage2/io.o build/boot_stage2/atapio.o build/boot_stage2/strings.o build/boot_stage2/screenstuff.o build/boot_stage2/stage2.o build/boot_stage2/paging.o
+PROGRAM_OBJS = build/program_code_entry.o build/program/program.o
 
 run: disk.img
 	qemu-system-x86_64 disk.img
@@ -30,6 +31,7 @@ prepare:
 	mkdir -p build/boot_stage2
 	mkdir -p build/kernel
 	mkdir -p build/kernel/datatypes
+	mkdir -p build/program
 	mountpoint img.d | grep not || umount img.d
 
 clean:
@@ -39,15 +41,15 @@ build/boot/boot.bin: src/boot/boot.asm
 	nasm $< -o $@
 
 # Boot Stage 2
-build/boot_stage2/boot.bin: src/boot_stage2/boot_stage2.ld $(STAGE2_OBS)
-	ld $(LDFLAGS) -T $< $(STAGE2_OBS)
+build/boot_stage2/boot.bin: src/boot_stage2/boot_stage2.ld $(STAGE2_OBJS)
+	ld $(LDFLAGS) -T $< $(STAGE2_OBJS)
 
 build/boot_stage2/%.o: src/boot_stage2/%.c
 	gcc $(CFLAGS) -o $@ -c $<
 
 # Kernel
-build/kernel/kernel.bin: build/kernel/kernel.elf
-	objcopy -O binary build/kernel/kernel.elf build/kernel/kernel.bin
+build/%.bin: build/%.elf
+	objcopy -O binary $< $@
 
 build/kernel/kernel.elf: src/kernel/kernel.ld $(KERNEL_OBJS)
 	ld $(LDFLAGS) -T $< $(KERNEL_OBJS)
@@ -55,15 +57,16 @@ build/kernel/kernel.elf: src/kernel/kernel.ld $(KERNEL_OBJS)
 build/boot_stage2/stage2.o: src/boot_stage2/main.c 
 	gcc $(CFLAGS) -o $@ -c $<
 
-build/kernel/%.o: src/kernel/%.c
+build/%.o: src/%.c
 	gcc $(CFLAGS) -o $@ -c $<
 
-build/kernel/%.o: src/kernel/%.cpp
+build/%.o: src/%.cpp
 	g++ $(CXXFLAGS) -o $@ -c $<
 
-build/kernel/%.o: src/kernel/%.asm
+build/%.o: src/%.asm
 	nasm -felf32 $< -o $@
 
-# Generic
-build/%.o: src/%.asm
-	nasm -felf32 $< -o $@
+# Program
+
+build/program/program.bin: src/program/program.ld $(PROGRAM_OBJS)
+	ld $(LDFLAGS) -T $< $(PROGRAM_OBJS)

src/program/program.c

@@ -0,0 +1,80 @@
+#include "../kernel/types.h"
+
+void print(char* string) {
+  asm volatile ("mov $0, %%eax; mov %0, %%esi; int $0x7f" : : "m" (string) : "eax", "esi");
+}
+
+char getch() {
+  asm volatile ("mov $1, %%eax; int $0x7f" : : :);
+}
+
+uint8_t getchPS2() {
+  asm volatile ("mov $2, %%eax; int $0x7f" : : :);
+}
+
+void readfile(char* filename, uint8_t* buffer) {
+  asm volatile ("mov $3, %%eax; mov %0, %%esi; mov %1, %%edi; int $0x7f" : : "m" (filename), "m" (buffer) : "eax", "esi", "edi");
+}
+
+void* localalloc(uint32_t size) {
+  asm volatile ("mov $4, %%eax; mov %0, %%esi; int $0x7f" : : "m" (size) : "esi");
+}
+
+void localdelete(void* ptr) {
+  asm volatile ("mov $5, %%eax; mov %0, %%esi; int $0x7f" : : "m" (ptr) : "esi");
+}
+
+uint32_t filesize(char* filename) {
+  asm volatile ("mov $6, %%eax; mov %0, %%esi; int $0x7f" : : "m" (filename) : "esi");
+}
+
+int int_to_decimal(unsigned int number, char* string_buffer) {
+  for (int i=0; i<11; i++)
+    string_buffer[i] = 0;
+  
+  int index = 9;
+  unsigned int acc = number;
+  if (acc == 0)
+    string_buffer[index--] = '0';
+  while (acc != 0) {
+    string_buffer[index--] = 0x30+(acc%10);
+    acc /= 10;
+  }
+  return (index+1);
+}
+
+char dec_to_hex[16] = "0123456789abcdef";
+int int_to_hex(unsigned int number, char* string_buffer) { 
+  for (int i=0; i<8; i++)
+    string_buffer[i] = '0';
+  string_buffer[8] = 0;
+  
+  int index = 7;
+  unsigned int acc = number;
+  if (acc == 0)
+    string_buffer[index--] = '0';
+  while (acc != 0) {
+    string_buffer[index--] = dec_to_hex[acc%0x10];
+    acc /= 0x10;
+  }
+  return (index+1);
+}
+
+int main() {
+  print("Testing C code program\n");
+  print("My strings are messed up for some reason...\n");
+
+  uint32_t alpha_size = filesize("HELLO   TXT");
+  char sizebuf[32];
+  uint32_t index = int_to_decimal(alpha_size, sizebuf);
+  print(sizebuf+index);
+  print("\n");
+  uint8_t* alpha_buffer = (uint8_t*)localalloc(alpha_size + 32);
+  print("alpha_buffer: ");
+  index = int_to_hex(alpha_buffer, sizebuf);
+  print(sizebuf+index);
+  print("\n");
+  readfile("HELLO   TXT", alpha_buffer);
+  print(alpha_buffer);
+  while (1);
+}

src/program/program.ld

@@ -0,0 +1,13 @@
+OUTPUT_FORMAT(binary)
+OUTPUT_ARCH(i386:i386)
+
+OUTPUT(build/program/program.bin)
+
+SECTIONS {
+  . = 0x8020;
+
+  .text : {
+    build/program_code_entry.o(.text)
+    build/program/program.o(.text)
+  }
+}

src/program_code_entry.asm

@@ -0,0 +1,7 @@
+[BITS 32]
+
+_start:
+  call main
+  int 0x80
+
+extern main