[USER] Temporary write syscall

kernel/include/debug.h

@@ -2,11 +2,14 @@
 #include <string.h>
 #include <int.h>
 #include <sync.h>
+#include <stddef.h>
 
 #ifndef NDEBUG
   #define debug(...) ({spin_lock(&debug_lock);debug_printf(__VA_ARGS__);spin_unlock(&debug_lock);})
+  #define debugn(str, n) ({spin_lock(&debug_lock);debug_putsn((str), (n)); spin_unlock(&debug_lock);})
 #else
   #define debug(...) ((void)0)
+  #define debugn(...) ((void)0)
 #endif
 #define debug_info(...) do{debug("[INFO] ");debug(__VA_ARGS__);}while(0)
 #define debug_ok(...) do{debug("[OK] ");debug(__VA_ARGS__);}while(0)

kernel/include/syscall.h

@@ -39,3 +39,5 @@ typedef long (*syscall_handler_t)(long num, long, long, long, long, long, long);
 #define SYSCALL_INIT(...) _SYSCALL_INIT(_SYSCALL_INIT,__VA_ARGS__)
 
 #define SYSCALL_REGISTER(name, num) syscall_handlers[num] = syscall_##name
+
+SYSCALL_DECL(write);

kernel/syscall/sys_fs.c

@@ -0,0 +1,20 @@
+#include <syscall.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <debug.h>
+#include <mem.h>
+#include <string.h>
+
+SYSCALL_DEF(write)
+{
+  SYSCALL_INIT(int, fd, void *, buffer, size_t, nbyte);
+
+
+  if(fd == 1)
+  {
+    debugn(buffer, nbyte);
+    return nbyte;
+  }
+
+  return 0;
+}

kernel/syscall/syscall.c

@@ -5,6 +5,7 @@
 #include <gdt.h>
 #include <registers.h>
 #include "../../libc/syscall_num.h"
+#include <string.h>
 
 extern void syscall_entry();
 
@@ -34,6 +35,7 @@ registers_t *syscall_handler(registers_t *r)
   }
 
   debug_error("Unknown syscall, No:%d\n", r->rax);
+
   debug("syscall_%d(%x, %x, %x, %x, %x, %x)\n", r->rax, r->rdi, r->rsi, r->rdx, r->r10, r->r8, r->r9);
   for(;;);
 }
@@ -54,6 +56,7 @@ void syscall_init()
     memset(syscall_handlers, 0, 1024*sizeof(syscall_handler_t));
 
     SYSCALL_REGISTER(debug, SYS_DEBUG);
+    SYSCALL_REGISTER(write, SYS_WRITE);
   }
 
 }