simple env with basic test init programHEADmaster

1 files changed, 22 insertions, 0 deletions

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