fbf342ab77
and used in C or vice versa. The elf compiler uses the same names for both. Remove asnames.h with great prejudice; it has served its purpose. Note that this does not affect the ability to generate an aout kernel due to gcc's -mno-underscores option. moral support from: peter, jhb
177 lines
4.5 KiB
ArmAsm
177 lines
4.5 KiB
ArmAsm
/*
|
|
* reg_norm.s
|
|
*
|
|
* Normalize the value in a FPU_REG.
|
|
*
|
|
* Call from C as:
|
|
* void normalize(FPU_REG *n)
|
|
*
|
|
* void normalize_nuo(FPU_REG *n)
|
|
*
|
|
*
|
|
* Copyright (C) 1992,1993,1994
|
|
* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
|
|
* Australia. E-mail billm@vaxc.cc.monash.edu.au
|
|
* All rights reserved.
|
|
*
|
|
* This copyright notice covers the redistribution and use of the
|
|
* FPU emulator developed by W. Metzenthen. It covers only its use
|
|
* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
|
|
* use is not permitted under this copyright.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must include information specifying
|
|
* that source code for the emulator is freely available and include
|
|
* either:
|
|
* a) an offer to provide the source code for a nominal distribution
|
|
* fee, or
|
|
* b) list at least two alternative methods whereby the source
|
|
* can be obtained, e.g. a publically accessible bulletin board
|
|
* and an anonymous ftp site from which the software can be
|
|
* downloaded.
|
|
* 3. All advertising materials specifically mentioning features or use of
|
|
* this emulator must acknowledge that it was developed by W. Metzenthen.
|
|
* 4. The name of W. Metzenthen may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*
|
|
* The purpose of this copyright, based upon the Berkeley copyright, is to
|
|
* ensure that the covered software remains freely available to everyone.
|
|
*
|
|
* The software (with necessary differences) is also available, but under
|
|
* the terms of the GNU copyleft, for the Linux operating system and for
|
|
* the djgpp ms-dos extender.
|
|
*
|
|
* W. Metzenthen June 1994.
|
|
*
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
|
|
#include <gnu/i386/fpemul/fpu_asm.h>
|
|
|
|
|
|
.text
|
|
|
|
ENTRY(normalize)
|
|
pushl %ebp
|
|
movl %esp,%ebp
|
|
pushl %ebx
|
|
|
|
movl PARAM1,%ebx
|
|
|
|
movl SIGH(%ebx),%edx
|
|
movl SIGL(%ebx),%eax
|
|
|
|
orl %edx,%edx /* ms bits */
|
|
js L_done /* Already normalized */
|
|
jnz L_shift_1 /* Shift left 1 - 31 bits */
|
|
|
|
orl %eax,%eax
|
|
jz L_zero /* The contents are zero */
|
|
|
|
/* L_shift_32: */
|
|
movl %eax,%edx
|
|
xorl %eax,%eax
|
|
subl $32,EXP(%ebx) /* This can cause an underflow */
|
|
|
|
/* We need to shift left by 1 - 31 bits */
|
|
L_shift_1:
|
|
bsrl %edx,%ecx /* get the required shift in %ecx */
|
|
subl $31,%ecx
|
|
negl %ecx
|
|
shld %cl,%eax,%edx
|
|
shl %cl,%eax
|
|
subl %ecx,EXP(%ebx) /* This can cause an underflow */
|
|
|
|
movl %edx,SIGH(%ebx)
|
|
movl %eax,SIGL(%ebx)
|
|
|
|
L_done:
|
|
cmpl EXP_OVER,EXP(%ebx)
|
|
jge L_overflow
|
|
|
|
cmpl EXP_UNDER,EXP(%ebx)
|
|
jle L_underflow
|
|
|
|
L_exit:
|
|
popl %ebx
|
|
leave
|
|
ret
|
|
|
|
|
|
L_zero:
|
|
movl EXP_UNDER,EXP(%ebx)
|
|
movb TW_Zero,TAG(%ebx)
|
|
jmp L_exit
|
|
|
|
L_underflow:
|
|
push %ebx
|
|
call arith_underflow
|
|
pop %ebx
|
|
jmp L_exit
|
|
|
|
L_overflow:
|
|
push %ebx
|
|
call arith_overflow
|
|
pop %ebx
|
|
jmp L_exit
|
|
|
|
|
|
|
|
/* Normalise without reporting underflow or overflow */
|
|
ENTRY(normalize_nuo)
|
|
pushl %ebp
|
|
movl %esp,%ebp
|
|
pushl %ebx
|
|
|
|
movl PARAM1,%ebx
|
|
|
|
movl SIGH(%ebx),%edx
|
|
movl SIGL(%ebx),%eax
|
|
|
|
orl %edx,%edx /* ms bits */
|
|
js L_exit /* Already normalized */
|
|
jnz L_nuo_shift_1 /* Shift left 1 - 31 bits */
|
|
|
|
orl %eax,%eax
|
|
jz L_zero /* The contents are zero */
|
|
|
|
/* L_nuo_shift_32: */
|
|
movl %eax,%edx
|
|
xorl %eax,%eax
|
|
subl $32,EXP(%ebx) /* This can cause an underflow */
|
|
|
|
/* We need to shift left by 1 - 31 bits */
|
|
L_nuo_shift_1:
|
|
bsrl %edx,%ecx /* get the required shift in %ecx */
|
|
subl $31,%ecx
|
|
negl %ecx
|
|
shld %cl,%eax,%edx
|
|
shl %cl,%eax
|
|
subl %ecx,EXP(%ebx) /* This can cause an underflow */
|
|
|
|
movl %edx,SIGH(%ebx)
|
|
movl %eax,SIGL(%ebx)
|
|
jmp L_exit
|
|
|
|
|