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Annotation of sys/arch/m88k/m88k/m88110_fp.S, Revision 1.1.1.1

1.1       nbrk        1: /* $OpenBSD: m88110_fp.S,v 1.2 2004/08/09 20:52:11 miod Exp $  */
                      2: /*
                      3:  * Copyright (c) 1999 Steve Murphree, Jr.
                      4:  * All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      9:  * 1. Redistributions of source code must retain the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer.
                     11:  * 2. Redistributions in binary form must reproduce the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer in the
                     13:  *    documentation and/or other materials provided with the distribution.
                     14:  * 3. All advertising materials mentioning features or use of this software
                     15:  *    must display the following acknowledgement:
                     16:  *      This product includes software developed by Christopher G. Demetriou.
                     17:  * 4. The name of the author may not be used to endorse or promote products
                     18:  *    derived from this software without specific prior written permission
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     21:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     22:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     23:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     24:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     25:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     26:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     27:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     28:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     29:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     30:  */
                     31:
                     32: /* Floating point trouble routines */
                     33: /*
                     34:  * August 1, 1999
                     35:  * smurph@OpenBSD.org
                     36:  *
                     37:  * Additions to support MVME197 (mc88110) mmu routines.
                     38:  */
                     39:
                     40: /*
                     41:  * This is cheesy.  I'm using the TCFP features of the mc88110
                     42:  * because it was easy.  It is not 100% IEEE.  But it may be
                     43:  * close enough.  We shall see...  XXXsmurph
                     44:  * Err... TCFP == "Time Critical Floating Point"
                     45:  *
                     46:  * The only two SFU1 exceptions that can occure in TCFP mode are:
                     47:  * 1) Unimplemented Floating Point Instruction
                     48:  * 2) Floating Point Privilege Violation
                     49:  */
                     50:
                     51: #include "assym.h"
                     52: #include <machine/trap.h>
                     53: #include <machine/asm.h>
                     54:
                     55: ASENTRY(m88110_Xfp_precise)
                     56:        or      r29, r3, r0     /*  r29 is now the E.F. */
                     57:        subu    r31, r31, 16
                     58:        st      r1,  r31, 0
                     59:        st      r29, r31, 4
                     60:
                     61:        ld      r2, r29, EF_FPSR * 4
                     62:        ld      r3, r29, EF_FPCR * 4
                     63:        ld      r4, r29, EF_FPECR * 4
                     64:
                     65:        /*
                     66:         * Load into r1 the return address for the 0 handlers.  Looking
                     67:         * at FPECR, branch to the appropriate 0 handler.  However,
                     68:         * if none of the 0 bits are enabled, then a floating point
                     69:         * instruction was issued with the floating point unit disabled.  This
                     70:         * will cause an unimplemented opcode 0.
                     71:         */
                     72:
                     73:        bb0     6,r4, 2f        /* branch to m88110_FPunimp if bit set */
                     74:        br      _ASM_LABEL(m88110_FPuimp)
                     75: 2:     bb0     5,r4, 3f        /* branch to m88110_FPpriviol if bit set */
                     76:        br      _ASM_LABEL(m88110_FPpriviol)
                     77: 3:
                     78:        or.u    r4, r4, 0xffff
                     79:
                     80: ASLOCAL(m88110_FPuimp)
                     81:        subu    r31,r31,16              /* allocate stack */
                     82:        st      r1,r31,4                /* save return address */
                     83:        st      r3,r31,0                /* save exception frame */
                     84:        or      r2,r0,T_FPEPFLT         /* load trap type */
                     85:        bsr.n   _C_LABEL(m88110_trap)   /* trap */
                     86:         or     r3, r29, r0
                     87:        ld      r1,r31,4                /* recover return address */
                     88:        jmp.n   r1
                     89:         addu   r31,r31,16              /* deallocate stack */
                     90:
                     91: ASLOCAL(m88110_FPpriviol)
                     92:        subu    r31,r31,16              /* allocate stack */
                     93:        st      r1,r31,4                /* save return address */
                     94:        st      r3,r31,0                /* save exception frame */
                     95:        or      r2,r0,T_PRIVINFLT       /* load trap type */
                     96:        bsr.n   _C_LABEL(m88110_trap)   /* trap */
                     97:         or     r3, r29, r0
                     98:        ld      r1,r31,4                /* recover return address */
                     99:        jmp.n   r1
                    100:         addu   r31,r31,16              /* deallocate stack */
                    101:
                    102: ENTRY(set_tcfp)
                    103:        or.u    r2, r0, hi16(0x200000)
                    104:        or      r2, r2, lo16(0x200000)
                    105:        jmp.n   r1
                    106:         fstcr  r2, fcr0