From a914c37365967afaf3148293a857c36af6f94ecb Mon Sep 17 00:00:00 2001
From: Aleksa Vučković <aleksav013@gmail.com>
Date: Fri, 21 Jan 2022 21:44:28 +0100
Subject: Separating assembly, moving #defines to .h & cleaning Makefile

---
 src/crt/crt0.s | 31 +++++++++++++++++++++++++++++++
 src/crt/crti.s | 16 ++++++++++++++++
 src/crt/crtn.s | 10 ++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 src/crt/crt0.s
 create mode 100644 src/crt/crti.s
 create mode 100644 src/crt/crtn.s

(limited to 'src/crt')

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
diff --git a/src/crt/crti.s b/src/crt/crti.s
new file mode 100644
index 0000000..5894e2d
--- /dev/null
+++ b/src/crt/crti.s
@@ -0,0 +1,16 @@
+/* x86 crti.s */
+.section .init
+.global _init
+.type _init, @function
+_init:
+    push %ebp
+    movl %esp, %ebp
+    /* gcc will nicely put the contents of crtbegin.o's .init section here. */
+
+.section .fini
+.global _fini
+.type _fini, @function
+_fini:
+    push %ebp
+    movl %esp, %ebp
+    /* gcc will nicely put the contents of crtbegin.o's .fini section here. */
diff --git a/src/crt/crtn.s b/src/crt/crtn.s
new file mode 100644
index 0000000..0e1c314
--- /dev/null
+++ b/src/crt/crtn.s
@@ -0,0 +1,10 @@
+/* x86 crtn.s */
+.section .init
+    /* gcc will nicely put the contents of crtend.o's .init section here. */
+    popl %ebp
+    ret
+
+.section .fini
+    /* gcc will nicely put the contents of crtend.o's .fini section here. */
+    popl %ebp
+    ret
-- 
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