sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 85 insertions, 0 deletions

diff --git a/device/lib/_fsget2args.c b/device/lib/_fsget2args.c
new file mode 100644
index 0000000..b565b79
--- /dev/null
+++ b/device/lib/_fsget2args.c
@@ -0,0 +1,85 @@
+/*-------------------------------------------------------------------------
+   _fsget2args.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
+{
+	// arg1: passed in a,b,dph,dpl
+	// arg2: passed on stack
+	__asm
+	.globl	fsgetargs
+fsgetargs:
+	// extract the two inputs, placing them into:
+	//      sign     exponent   mantissa
+	//      ----     --------   --------
+	//  a:  sign_a   exp_a      r4/r3/r2
+	//  b:  sign_b   exp_b      r7/r6/r5
+	//
+	mov	r2, dpl
+	mov	r3, dph
+	mov	c, b.7
+	rlc	a
+	mov	sign_a, c
+	mov	exp_a, a
+	jz	00001$
+	setb	b.7
+00001$:
+	mov	r4, b
+	// now extract the 2nd parameter from the stack
+	mov	a, sp
+	add	a, #249
+	mov	r0, a
+	mov	a, @r0
+	mov	r5, a
+	inc	r0
+	mov	a, @r0
+	mov	r6, a
+	inc	r0
+	mov	b, @r0
+	inc	r0
+	mov	a, @r0
+	mov	c, b.7
+	rlc	a
+	mov	sign_b, c
+	mov	exp_b, a
+	jz	00002$
+	setb	b.7
+00002$:
+	mov	r7, b
+	ret
+	__endasm;
+}
+
+#endif