From 7d1b7436d4c294f7ce0191291040e31160cceed9 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 21 Mar 2024 15:20:20 +0200
Subject: [PATCH] LibC: Dummy ctr* files for i386

This allows compilation of libc for i386 targets
---
 libc/arch/i386/crt0.S | 33 +++++++++++++++++++++++++++++++++
 libc/arch/i386/crti.S | 16 ++++++++++++++++
 libc/arch/i386/crtn.S | 10 ++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 libc/arch/i386/crt0.S
 create mode 100644 libc/arch/i386/crti.S
 create mode 100644 libc/arch/i386/crtn.S

diff --git a/libc/arch/i386/crt0.S b/libc/arch/i386/crt0.S
new file mode 100644
index 00000000..66678945
--- /dev/null
+++ b/libc/arch/i386/crt0.S
@@ -0,0 +1,33 @@
+.section .text
+
+.global _start
+_start:
+	# zero out stack frame
+	pushl $0
+	pushl $0
+	movl %esp, %ebp
+
+	# FIXME: handle stack alignment
+	ud2
+
+	# push argc, argv, environ for call to main
+	pushl %edx
+	pushl %esi
+	pushl %edi
+
+	# initialize libc
+	pushl %edx
+	call _init_libc
+	addl $4, %esp
+
+	# call global constructos
+	call _init
+
+	# call main, arguments are already on stack
+	call main
+
+	# cleanly exit the process
+	pushl %eax
+	call exit
+
+.size _start, . - _start
diff --git a/libc/arch/i386/crti.S b/libc/arch/i386/crti.S
new file mode 100644
index 00000000..75175fd5
--- /dev/null
+++ b/libc/arch/i386/crti.S
@@ -0,0 +1,16 @@
+/* i386 crti.s */
+.section .init
+.global _init
+.type _init, @function
+_init:
+	pushl %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:
+	pushl %ebp
+	movl %esp, %ebp
+	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */
diff --git a/libc/arch/i386/crtn.S b/libc/arch/i386/crtn.S
new file mode 100644
index 00000000..935c8d1b
--- /dev/null
+++ b/libc/arch/i386/crtn.S
@@ -0,0 +1,10 @@
+/* i386 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