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

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