From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/ia64.s | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 jni/ruby/ia64.s

(limited to 'jni/ruby/ia64.s')

diff --git a/jni/ruby/ia64.s b/jni/ruby/ia64.s
new file mode 100644
index 0000000..1087105
--- /dev/null
+++ b/jni/ruby/ia64.s
@@ -0,0 +1,42 @@
+// rb_ia64_flushrs and rb_ia64_bsp is written in IA64 assembly language
+// because Intel Compiler for IA64 doesn't support inline assembly.
+//
+// This file is based on following C program compiled by gcc.
+//
+//   void rb_ia64_flushrs(void) { __builtin_ia64_flushrs(); }
+//   void *rb_ia64_bsp(void) { return __builtin_ia64_bsp(); }
+//
+// Note that rb_ia64_flushrs and rb_ia64_bsp works in its own stack frame.
+// It's because BSP is updated by br.call/brl.call (not alloc instruction).
+// So rb_ia64_flushrs flushes stack frames including caller's one.
+// rb_ia64_bsp returns the address next to caller's register stack frame.
+//
+// See also
+// Intel Itanium Architecture Software Developer's Manual
+// Volume 2: System Architecture.
+//
+	.file	"ia64.c"
+	.text
+	.align 16
+	.global rb_ia64_flushrs#
+	.proc rb_ia64_flushrs#
+rb_ia64_flushrs:
+	.prologue
+	.body
+	flushrs
+	;;
+	nop.i 0
+	br.ret.sptk.many b0
+	.endp rb_ia64_flushrs#
+	.align 16
+	.global rb_ia64_bsp#
+	.proc rb_ia64_bsp#
+rb_ia64_bsp:
+	.prologue
+	.body
+	nop.m 0
+	;;
+	mov r8 = ar.bsp
+	br.ret.sptk.many b0
+	.endp rb_ia64_bsp#
+	.ident	"GCC: (GNU) 3.3.5 (Debian 1:3.3.5-13)"
-- 
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