sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 181 insertions, 0 deletions

diff --git a/device/lib/_divuint.c b/device/lib/_divuint.c
new file mode 100644
index 0000000..71d9557
--- /dev/null
+++ b/device/lib/_divuint.c
@@ -0,0 +1,181 @@
+/*-------------------------------------------------------------------------
+   _divuint.c - routine for unsigned int (16 bit) division
+
+   Copyright (C) 1999, Jean-Louis Vern <jlvern AT gmail.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.
+-------------------------------------------------------------------------*/
+
+/*   Assembler-functions are provided for:
+     mcs51 small
+     mcs51 small stack-auto
+*/
+
+#include <stdbool.h>
+
+#if !defined(__SDCC_USE_XSTACK) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
+#  if defined(__SDCC_mcs51)
+#    if defined(__SDCC_MODEL_SMALL)
+#      if defined(__SDCC_STACK_AUTO)
+#        define _DIVUINT_ASM_SMALL_AUTO
+#      else
+#        define _DIVUINT_ASM_SMALL
+#      endif
+#    endif
+#  endif
+#endif
+
+#if defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO
+
+static void
+_divuint_dummy (void) __naked
+{
+	__asm
+
+	.globl __divuint
+
+__divuint:
+
+	#define count   r2
+	#define reste_l r3
+	#define reste_h r4
+	#define xl      dpl
+	#define xh      dph
+
+#if defined(__SDCC_PARMS_IN_BANK1)
+	#define yl      (b1_0)
+	#define yh      (b1_1)
+#else // __SDCC_PARMS_IN_BANK1
+  #if defined(__SDCC_STACK_AUTO)
+
+	.globl __divint
+
+	mov	a,sp
+	add	a,#-2		; 2 bytes return address
+	mov	r0,a		; r0 points to yh
+	mov	a,@r0		; load yh
+	mov	r1,a
+	dec	r0
+	mov	a,@r0		; load yl
+	mov	r0,a
+
+	#define yl      r0
+	#define yh      r1
+
+__divint:			; entry point for __divsint
+
+
+  #else // __SDCC_STACK_AUTO
+
+    #if defined(__SDCC_NOOVERLAY)
+	.area DSEG    (DATA)
+    #else
+	.area OSEG    (OVR,DATA)
+    #endif
+
+	.globl __divuint_PARM_2
+	.globl __divsint_PARM_2
+
+__divuint_PARM_2:
+__divsint_PARM_2:
+	.ds	2
+
+	.area CSEG    (CODE)
+
+	#define yl      (__divuint_PARM_2)
+	#define yh      (__divuint_PARM_2 + 1)
+
+  #endif // __SDCC_STACK_AUTO
+#endif // __SDCC_PARMS_IN_BANK1
+
+	mov	count,#16
+	clr	a
+	mov	reste_l,a
+	mov	reste_h,a
+
+loop:
+	mov	a,xl		; x <<= 1
+	add	a,acc
+	mov	xl,a
+	mov	a,xh
+	rlc	a
+	mov	xh,a
+
+	mov	a,reste_l	; reste <<= 1
+	rlc	a		;   feed in carry
+	mov	reste_l,a
+	mov	a,reste_h
+	rlc	a
+	mov	reste_h,a
+
+	mov	a,reste_l	; reste - y
+	subb	a,yl		; here carry is always clear, because
+					; reste <<= 1 never overflows
+	mov	b,a
+	mov	a,reste_h
+	subb	a,yh
+
+	jc	smaller		; reste >= y?
+
+	mov	reste_h,a	; -> yes;  reste = reste - y;
+	mov	reste_l,b
+	orl	xl,#1
+smaller:			; -> no
+	djnz	count,loop
+	ret
+
+	__endasm;
+}
+
+#else  // defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO
+
+#define MSB_SET(x) ((x >> (8*sizeof(x)-1)) & 1)
+
+unsigned int
+_divuint (unsigned int x, unsigned int y)
+{
+  unsigned int reste = 0;
+  unsigned char count = 16;
+  bool c;
+
+  do
+  {
+    // reste: x <- 0;
+    c = MSB_SET(x);
+    x <<= 1;
+    reste <<= 1;
+    if (c)
+      reste |= 1;
+
+    if (reste >= y)
+    {
+      reste -= y;
+      // x <- (result = 1)
+      x |= 1;
+    }
+  }
+  while (--count);
+  return x;
+}
+
+#endif  // defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO