1 files changed, 85 insertions, 0 deletions
diff --git a/libc/gnu_i386/cstartup.s b/libc/gnu_i386/cstartup.s
new file mode 100644
index 0000000..780d3a4
--- /dev/null
+++ b/libc/gnu_i386/cstartup.s
@@ -0,0 +1,85 @@
+#
+# This is a startup for GCC compiling to an ELF executable.
+#
+#
+	.file	"cstartup.s"
+
+# void (*__cleanup)() = 0;
+
+.globl __cleanup
+.data
+	.align 4
+	.type	 __cleanup,@object
+	.size	 __cleanup,4
+__cleanup:
+	.long 0
+
+.globl errno
+	.align 4
+	.type	 errno,@object
+	.size	 errno,4
+errno:
+	.long 0
+
+# char ** environ;
+	.comm	environ,4,4
+
+.text
+  .align 16
+.globl __cstartup
+.type  __cstartup,@function
+__cstartup:		# Crt0 startup (Linux style)
+  cmpl	$0,(%esp)
+  jz	call_exit	# If argc == 0 this is being called by ldd, exit.
+
+  popl %ecx
+  movl %esp,%ebx  # Points to the arguments
+  movl %esp,%eax
+  movl %ecx,%edx
+  addl %edx,%edx
+  addl %edx,%edx
+  addl %edx,%eax
+  addl $4,%eax	  # Now points to environ.
+
+  pushl %eax      # envp
+  pushl %ebx      # argp
+  pushl %ecx      # argc
+
+  # mov	8(%esp),%eax
+  mov	%eax,environ
+
+  call	main
+  push	%eax		# Main has returned,
+call_exit:
+  call	exit		# return val and call exit();
+bad_exit:
+  jmp	bad_exit	# Exit returned !!
+
+# Exit - call __cleanup then _exit
+
+  .align 16
+.globl exit
+  .type	 exit,@function
+exit:
+  pushl %ebp
+  movl %esp,%ebp
+  pushl %ebx
+  movl 8(%ebp),%ebx
+  movl __cleanup,%eax
+  testl %eax,%eax
+  je .L8
+  pushl %ebx
+  call *%eax
+  addl $4,%esp
+.L8:
+  pushl %ebx
+  call _exit
+  jmp bad_exit
+
+# _exit is an alias for __exit
+  .align 16
+.globl _exit
+  .type	 _exit,@function
+_exit:
+ jmp __exit
+