From 50392995d6e7f3a10fb74bb2f9073a4790f8933c Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Mon, 11 Mar 2024 21:40:28 -0400
Subject: simple env with basic test init program

---
 lib/crt/x86_64/crt0.s | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 lib/crt/x86_64/crt0.s

(limited to 'lib/crt/x86_64/crt0.s')

diff --git a/lib/crt/x86_64/crt0.s b/lib/crt/x86_64/crt0.s
new file mode 100644
index 0000000..c5a0ba9
--- /dev/null
+++ b/lib/crt/x86_64/crt0.s
@@ -0,0 +1,22 @@
+.section .text
+.global _start
+_start:
+    #Setup start of stack frame
+    xorq %rbp, %rbp
+    pushq %rbp
+    pushq %rbp
+    movq %rsp, %rbp
+
+    #Save arguments passed to main
+    pushq %rdi
+    pushq %rsi
+
+    #Setup libc and call global constructors
+
+    #Call main
+    call main
+
+    #Exit
+    movq %rax, %rdi
+    call exit
+.size _start, . - _start
-- 
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