Separating assembly, moving #defines to .h & cleaning Makefile

1 files changed, 31 insertions, 0 deletions

diff --git a/src/crt/crt0.s b/src/crt/crt0.s
new file mode 100644
index 0000000..8c735f1
--- /dev/null
+++ b/src/crt/crt0.s
@@ -0,0 +1,31 @@
+.section .text
+
+.global _start
+_start:
+    # Set up end of the stack frame linked list.
+    movl $0, %ebp
+    pushl %ebp # rip=0
+    pushl %ebp # rbp=0
+    movl %esp, %ebp
+
+    # We need those in a moment when we call main.
+    pushl %esi
+    pushl %edi
+
+    # Prepare signals, memory allocation, stdio and such.
+#    call initialize_standard_library
+
+    # Run the global constructors.
+    call _init
+
+    # Restore argc and argv.
+    popl %edi
+    popl %esi
+
+    # Run main
+    call main
+
+    # Terminate the process with the exit code.
+    movl %eax, %edi
+#    call exit
+.size _start, . - _start