ADD: charge basics stuff.

1 files changed, 17 insertions, 0 deletions

@@ -0,0 +1,17 @@
+.section .text
+.globl _start
+.type _start, @function
+_start:
+        xorq %rbp, %rbp # frame ptr (%rbp) = null. marks stack bottom.
+
+        movl (%rsp), %edi # argc = first 4 bytes of stack.
+        leaq 8(%rsp), %rsi # argv = address of first arg ptr.
+
+        call main # see main.c.
+
+        movl %eax, %edi # status = ret val.
+        movl $1, %eax # SYS_exit = 1.
+        syscall
+
+        .size _start, .-_start
+        hlt # if syscall fails hang.