20000317 sourceware import

libgloss/i386/cygmon-crt0.S

@@ -0,0 +1,82 @@
+/*
+ * crt0 startup code for user programs running under Cygmon
+ *
+ * Copyright (c) 1998 Cygnus Support
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#ifndef NEED_UNDERSCORE
+#define SYM(X) X
+#else
+#define SYM(X) _ ## X
+#endif
+
+.data
+        .align  8
+SYM(environ):
+        .long   0
+
+SYM(argc):
+	.long	0
+
+	.text
+	.align 4
+
+	.globl SYM(_start)
+SYM(_start):
+	/* see if the stack is already setup. if not, then default
+         *  to using the value of %sp as set by the ROM monitor
+         */
+	lea __stack,%eax
+	cmpl $0,%eax
+	jz 1f
+	mov %eax, %esp
+1:
+	mov $0, %ebp
+
+	lea __bss_start, %eax
+2:
+	movb $0,(%eax)
+	inc %eax
+	cmp $__bss_end,%eax
+	jl 2b
+	
+2:
+	pushl $SYM(__sigtramp)
+	pushl $0
+	call SYM(__install_signal_handler)
+	add $4, %esp
+
+	pushl $SYM(__do_global_dtors)
+	call SYM(atexit)
+	add $4, %esp
+
+	call SYM(__do_global_ctors)
+
+	pushl $SYM(argc)
+	call SYM(__get_program_arguments)
+	add $4, %esp
+
+	pushl %eax
+	lea SYM(argc), %ebx
+	pushl (%ebx)
+	call SYM(main)
+	add $8, %esp
+
+	/* call exit from the C library so atexit gets called, and the
+	 * C++ destructors get run. This calls our exit routine below	 
+	 * when it's done.
+	 */
+	pushl %eax
+	call	SYM(exit)
+3:
+	jmp 3b