1 files changed, 134 insertions, 0 deletions
diff --git a/prologue.asm b/prologue.asm
new file mode 100644
index 0000000..74d9de3
--- /dev/null
+++ b/prologue.asm
@@ -0,0 +1,134 @@
+; SYS_EXIT  equ 0x2000001 ;code
+; SYS_FORK  equ 0x2000002 ;--
+; SYS_READ  equ 0x2000003 ;fd, buf, len
+; SYS_WRITE equ 0x2000004 ;fd, buf, len
+
+global start
+default rel
+
+section .text
+start:
+	call main
+	mov rdi, rax
+	mov eax, 0x2000001
+	syscall
+	jmp $
+
+putc:
+	push rax
+	push rdi
+	push rsi
+	push rdx
+	push rcx
+	push r11
+	mov eax, 0x2000004
+	mov edi, 1
+	lea rsi, [rsp+56]
+	mov edx, edi
+	syscall
+	pop r11
+	pop rcx
+	pop rdx
+	pop rsi
+	pop rdi
+	pop rax
+	ret
+
+putint:
+	push rdi
+	push rsi
+	push rax
+	push rbx
+	push rcx
+	push rdx
+	push r11
+	mov rax, [rsp+64]
+	mov ebx, 18
+	test rax, rax
+	jz .numzero
+
+	mov ecx, 10
+
+.strlp:
+	xor edx, edx
+	div rcx
+	add dl, '0'
+	dec rbx
+	mov [rsp+rbx], dl
+	test rax, rax
+	jnz .strlp
+	jmp .strdone
+
+.numzero:
+	dec rbx
+	mov byte [rsp+rbx], '0'
+	jmp .strdone
+
+.strdone:
+	mov eax, 0x2000004
+	mov edi, 1
+	lea rsi, [rsp+rbx]
+	mov edx, 18
+	sub rdx, rbx
+	syscall
+
+	pop r11
+	pop rdx
+	pop rcx
+	pop rbx
+	pop rax
+	pop rsi
+	pop rdi
+	ret
+
+getc:
+	push rdi
+	push rsi
+	push rdx
+	push rcx
+	push r11
+	mov eax, 0x2000003
+	xor edi, edi
+	mov rsi, rsp
+	mov edx, 1
+	syscall
+	cmp rax, 1
+	jne .fail
+	mov rax, [rsp]
+.finish:
+	pop r11
+	pop rcx
+	pop rdx
+	pop rsi
+	pop rdi
+	ret
+.fail:
+	mov rax, -1
+	jmp .finish
+
+_builtin_malloc:
+	push rdi
+	push rsi
+	push rdx
+	push r8
+	push r9
+	push r10
+	push r11
+	push rcx
+	xor edi, edi
+	mov rsi, [rsp+72]
+	mov edx, 0x03
+	mov r10d, 0x1001
+	mov r8d, -1
+	xor r9d, r9d
+	mov eax, 0x20000C5
+	syscall
+	pop rcx
+	pop r11
+	pop r10
+	pop r9
+	pop r8
+	pop rdx
+	pop rsi
+	pop rdi
+	ret