sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 69 insertions, 0 deletions

diff --git a/device/lib/_fsswapargs.c b/device/lib/_fsswapargs.c
new file mode 100644
index 0000000..9b6fdbc
--- /dev/null
+++ b/device/lib/_fsswapargs.c
@@ -0,0 +1,69 @@
+/*-------------------------------------------------------------------------
+   _fsswapargs.c - Floating point library in optimized assembly for 8051
+
+   Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+
+
+#define __SDCC_FLOAT_LIB
+#include <float.h>
+
+
+#ifdef FLOAT_ASM_MCS51
+
+static void dummy(void) __naked
+{
+	__asm
+	.globl	fs_swap_a_b
+fs_swap_a_b:
+	mov	a, exp_a
+	xch	a, exp_b
+	mov	exp_a, a
+	// is there a faster way to swap these 2 bits???
+	// this trick with psw can play havoc with the resiter bank setting
+	// mov	a, psw
+	// swap	a		// depends on sign bits in psw.1 & psw.5
+	// mov	psw, a
+	mov	c, sign_a
+	rlc	a
+	mov	c, sign_b
+	mov	sign_a, c
+	rrc	a
+	mov	sign_b, c
+	mov	a, r4
+	xch	a, r7
+	mov	r4, a
+	mov	a, r3
+	xch	a, r6
+	mov	r3, a
+	mov	a, r2
+	xch	a, r5
+	mov	r2, a
+	ret
+	__endasm;
+}
+
+#endif