1 files changed, 56 insertions, 0 deletions

diff --git a/src/x86_64/prelude.asm b/src/x86_64/prelude.asm
new file mode 100644
index 0000000..788b8e9
--- /dev/null
+++ b/src/x86_64/prelude.asm
@@ -0,0 +1,56 @@
+printdln:
+        sub     rsp, 40
+        mov     BYTE [rsp+31], 10
+        test    rdi, rdi
+        jne     .L2
+        mov     BYTE [rsp+30], 48
+        mov     eax, 30
+        mov     r8d, 2
+.L3:
+        lea     rsi, [rsp+rax]
+        mov     rdx, r8
+        ;; write syscall (Linux)
+        mov     rdi, 1
+        mov     rax, 1
+        syscall
+        add     rsp, 40
+        ret
+.L2:
+        mov     r10d, 1
+        js      .L12
+.L4:
+        mov     r8d, 1
+        lea     r9, [rsp+31]
+        mov     rsi, -3689348814741910323
+.L5:
+        mov     rax, rdi
+        mov     rcx, r9
+        mul     rsi
+        sub     rcx, r8
+        shr     rdx, 3
+        lea     rax, [rdx+rdx*4]
+        add     rax, rax
+        sub     rdi, rax
+        mov     rax, r8
+        add     r8, 1
+        add     edi, 48
+        mov     BYTE [rcx], dil
+        mov     rdi, rdx
+        test    rdx, rdx
+        jne     .L5
+        cmp     r10d, -1
+        jne     .L10
+        not     r8
+        mov     BYTE [rsp+32+r8], 45
+        lea     r8, [rax+2]
+.L10:
+        mov     eax, 32
+        sub     rax, r8
+        jmp     .L3
+.L12:
+        neg     rdi
+        mov     r10d, -1
+        jmp     .L4
+
+global  _start
+_start: