patch-2.2.18 linux/arch/m68k/math-emu/fp_scan.S

• Lines: 479
• Date: Fri Oct 13 23:36:54 2000
• Orig file: v2.2.17/arch/m68k/math-emu/fp_scan.S
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/m68k/math-emu/fp_scan.S linux/arch/m68k/math-emu/fp_scan.S
@@ -0,0 +1,478 @@
+/*
+ * fp_scan.S
+ *
+ * Copyright Roman Zippel, 1997.  All rights reserved.
+ *
+ * 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, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * 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 THE AUTHOR 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.
+ */
+
+#include "fp_emu.h"
+#include "fp_decode.h"
+
+	.globl	fp_scan, fp_datasize
+
+	.data
+
+| %d2 - first two instr words
+| %d1 - operand size
+
+/* operand formats are:
+
+	Long = 0,		i.e. fmove.l
+	Single,			i.e. fmove.s
+	Extended,		i.e. fmove.x
+	Packed-BCD,		i.e. fmove.p
+	Word,			i.e. fmove.w
+	Double,			i.e. fmove.d
+*/
+
+	.text
+
+| On entry:
+| FPDATA - base of emulated FPU registers
+
+fp_scan:
+| normal fpu instruction? (this excludes fsave/frestore)
+	fp_get_pc %a0
+	printf	PDECODE,"%08x: ",1,%a0
+	getuser.b (%a0),%d0,fp_err_ua1,%a0
+#if 1
+	cmp.b	#0xf2,%d0		| cpid = 1
+#else
+	cmp.b	#0xfc,%d0		| cpid = 6
+#endif
+	jne	fp_nonstd
+| first two instruction words are kept in %d2
+	getuser.l (%a0)+,%d2,fp_err_ua1,%a0
+	fp_put_pc %a0
+fp_decode_cond:				| seperate conditional instr
+	fp_decode_cond_instr_type
+
+	.long	fp_decode_move, fp_fscc
+	.long	fp_fbccw, fp_fbccl
+
+fp_decode_move:				| seperate move instr
+	fp_decode_move_instr_type
+
+	.long	fp_fgen_fp, fp_ill
+	.long	fp_fgen_ea, fp_fmove_fp2mem
+	.long	fp_fmovem_cr, fp_fmovem_cr
+	.long	fp_fmovem_fp, fp_fmovem_fp
+
+| now all arithmetic instr and a few move instr are left
+fp_fgen_fp:				| source is a fpu register
+	clr.b	(FPD_FPSR+2,FPDATA)	| clear the exception byte
+	fp_decode_sourcespec
+	printf	PDECODE,"f<op>.x fp%d",1,%d0
+	fp_get_fp_reg
+	lea	(FPD_TEMPFP1,FPDATA),%a1 | copy src into a temp location
+	move.l	(%a0)+,(%a1)+
+	move.l	(%a0)+,(%a1)+
+	move.l	(%a0),(%a1)
+	lea	(-8,%a1),%a0
+	jra	fp_getdest
+
+fp_fgen_ea:				| source is <ea>
+	clr.b	(FPD_FPSR+2,FPDATA)	| clear the exception byte
+	| sort out fmovecr, keep data size in %d1
+	fp_decode_sourcespec
+	cmp.w	#7,%d0
+	jeq	fp_fmovecr
+	move.w	%d0,%d1			| store data size twice in %d1
+	swap	%d1			| one can be trashed below
+	move.w	%d0,%d1
+#ifdef FPU_EMU_DEBUG
+	lea	0f,%a0
+	clr.l	%d0
+	move.b	(%a0,%d1.w),%d0
+	printf	PDECODE,"f<op>.%c ",1,%d0
+
+	.data
+0:	.byte	'l','s','x','p','w','d','b',0
+	.previous
+#endif
+
+/*
+	fp_getsource, fp_getdest
+
+	basically, we end up with a pointer to the source operand in
+	%a1, and a pointer to the destination operand in %a0.  both
+	are, of course, 96-bit extended floating point numbers.
+*/
+
+fp_getsource:
+	| decode addressing mode for source
+	fp_decode_addr_mode
+
+	.long 	fp_data, fp_ill
+	.long 	fp_indirect, fp_postinc
+	.long 	fp_predecr, fp_disp16
+	.long 	fp_extmode0, fp_extmode1
+
+	| addressing mode: data register direct
+fp_data:
+	fp_mode_data_direct
+	jsr	fp_get_data_reg
+	lea	(FPD_TEMPFP1,FPDATA),%a0
+	jmp	([0f:w,%pc,%d1.w*4])
+
+	.align	4
+0:
+	.long	fp_data_long, fp_data_single
+	.long	fp_ill, fp_ill
+	.long	fp_data_word, fp_ill
+	.long	fp_data_byte, fp_ill
+
+	| data types that fit in an integer data register
+fp_data_byte:
+	extb.l	%d0
+	jra	fp_data_long
+
+fp_data_word:
+	ext.l	%d0
+
+fp_data_long:
+	jsr	fp_conv_long2ext
+	jra	fp_getdest
+
+fp_data_single:
+	jsr	fp_conv_single2ext
+	jra	fp_getdest
+
+	| addressing mode: address register indirect
+fp_indirect:
+	fp_mode_addr_indirect
+	jra	fp_fetchsource
+
+	| addressing mode: address register indirect with postincrement
+fp_postinc:
+	fp_mode_addr_indirect_postinc
+	jra	fp_fetchsource
+
+	| addressing mode: address register indirect with predecrement
+fp_predecr:
+	fp_mode_addr_indirect_predec
+	jra	fp_fetchsource
+
+	| addressing mode: address register/programm counter indirect
+	|		   with 16bit displacement
+fp_disp16:
+	fp_mode_addr_indirect_disp16
+	jra	fp_fetchsource
+
+	| all other indirect addressing modes will finally end up here
+fp_extmode0:
+	fp_mode_addr_indirect_extmode0
+	jra	fp_fetchsource
+
+| all pc relative addressing modes and immediate/absolute modes end up here
+| the first ones are sent to fp_extmode0 or fp_disp16
+| and only the latter are handled here
+fp_extmode1:
+	fp_decode_addr_reg
+	jmp	([0f:w,%pc,%d0*4])
+
+	.align	4
+0:
+	.long	fp_abs_short, fp_abs_long
+	.long	fp_disp16, fp_extmode0
+	.long	fp_immediate, fp_ill
+	.long	fp_ill, fp_ill
+
+	| addressing mode: absolute short
+fp_abs_short:
+	fp_mode_abs_short
+	jra	fp_fetchsource
+
+	| addressing mode: absolute long
+fp_abs_long:
+	fp_mode_abs_long
+	jra	fp_fetchsource
+
+	| addressing mode: immediate data
+fp_immediate:
+	printf	PDECODE,"#"
+	fp_get_pc %a0
+	move.w	(fp_datasize,%d1.w*2),%d0
+	addq.w	#1,%d0
+	and.w	#-2,%d0
+#ifdef FPU_EMU_DEBUG
+	movem.l	%d0/%d1,-(%sp)
+	movel	%a0,%a1
+	clr.l	%d1
+	jra	2f
+1:	getuser.b (%a1)+,%d1,fp_err_ua1,%a1
+	printf	PDECODE,"%02x",1,%d1
+2:	dbra	%d0,1b
+	movem.l	(%sp)+,%d0/%d1
+#endif
+	lea	(%a0,%d0.w),%a1
+	fp_put_pc %a1
+|	jra	fp_fetchsource
+
+fp_fetchsource:
+	move.l	%a0,%a1
+	swap	%d1
+	lea	(FPD_TEMPFP1,FPDATA),%a0
+	jmp	([0f:w,%pc,%d1.w*4])
+
+	.align	4
+0:	.long	fp_long, fp_single
+	.long	fp_ext, fp_pack
+	.long	fp_word, fp_double
+	.long	fp_byte, fp_ill
+
+fp_long:
+	getuser.l (%a1),%d0,fp_err_ua1,%a1
+	jsr	fp_conv_long2ext
+	jra	fp_getdest
+
+fp_single:
+	getuser.l (%a1),%d0,fp_err_ua1,%a1
+	jsr	fp_conv_single2ext
+	jra	fp_getdest
+
+fp_ext:
+	getuser.l (%a1)+,%d0,fp_err_ua1,%a1
+	lsr.l	#8,%d0
+	lsr.l	#7,%d0
+	lsr.w	#1,%d0
+	move.l	%d0,(%a0)+
+	getuser.l (%a1)+,%d0,fp_err_ua1,%a1
+	move.l	%d0,(%a0)+
+	getuser.l (%a1),%d0,fp_err_ua1,%a1
+	move.l	%d0,(%a0)
+	subq.l	#8,%a0
+	jra	fp_getdest
+
+fp_pack:
+	/* not supported yet */
+	jra	fp_ill
+
+fp_word:
+	getuser.w (%a1),%d0,fp_err_ua1,%a1
+	ext.l	%d0
+	jsr	fp_conv_long2ext
+	jra	fp_getdest
+
+fp_double:
+	jsr	fp_conv_double2ext
+	jra	fp_getdest
+
+fp_byte:
+	getuser.b (%a1),%d0,fp_err_ua1,%a1
+	extb.l	%d0
+	jsr	fp_conv_long2ext
+|	jra	fp_getdest
+
+fp_getdest:
+	move.l	%a0,%a1
+	bfextu	%d2{#22,#3},%d0
+	printf	PDECODE,",fp%d\n",1,%d0
+	fp_get_fp_reg
+	movem.l	%a0/%a1,-(%sp)
+	pea	fp_finalrounding
+	bfextu	%d2{#25,#7},%d0
+	jmp	([0f:w,%pc,%d0*4])
+
+	.align	4
+0:
+	.long	fp_fmove_mem2fp, fp_fint, fp_fsinh, fp_fintrz
+	.long	fp_fsqrt, fp_ill, fp_flognp1, fp_ill
+	.long	fp_fetoxm1, fp_ftanh, fp_fatan, fp_ill
+	.long	fp_fasin, fp_fatanh, fp_fsin, fp_ftan
+	.long	fp_fetox, fp_ftwotox, fp_ftentox, fp_ill
+	.long	fp_flogn, fp_flog10, fp_flog2, fp_ill
+	.long	fp_fabs, fp_fcosh, fp_fneg, fp_ill
+	.long	fp_facos, fp_fcos, fp_fgetexp, fp_fgetman
+	.long	fp_fdiv, fp_fmod, fp_fadd, fp_fmul
+	.long	fpa_fsgldiv, fp_frem, fp_fscale, fpa_fsglmul
+	.long	fp_fsub, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_fsincos0, fp_fsincos1, fp_fsincos2, fp_fsincos3
+	.long	fp_fsincos4, fp_fsincos5, fp_fsincos6, fp_fsincos7
+	.long	fp_fcmp, fp_ill, fp_ftst, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_fsmove, fp_fssqrt, fp_ill, fp_ill
+	.long	fp_fdmove, fp_fdsqrt, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_fsabs, fp_ill, fp_fsneg, fp_ill
+	.long	fp_fdabs, fp_ill, fp_fdneg, fp_ill
+	.long	fp_fsdiv, fp_ill, fp_fsadd, fp_fsmul
+	.long	fp_fddiv, fp_ill, fp_fdadd, fp_fdmul
+	.long	fp_fssub, fp_ill, fp_ill, fp_ill
+	.long	fp_fdsub, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+	.long	fp_ill, fp_ill, fp_ill, fp_ill
+
+	| Instructions follow
+
+	| Move an (emulated) ROM constant
+fp_fmovecr:
+	bfextu	%d2{#27,#5},%d0
+	printf	PINSTR,"fp_fmovecr #%d",1,%d0
+	move.l	%d0,%d1
+	add.l	%d0,%d0
+	add.l	%d1,%d0
+	lea	(fp_constants,%d0*4),%a0
+	move.l	#0x801cc0ff,%d0
+	addq.l	#1,%d1
+	lsl.l	%d1,%d0
+	jcc	1f
+	fp_set_sr FPSR_EXC_INEX2			| INEX2 exception
+1:	moveq	#-128,%d0				| continue with fmove
+	and.l	%d0,%d2
+	jra	fp_getdest
+
+	.data
+	.align	4
+fp_constants:
+	.long	0x00004000,0xc90fdaa2,0x2168c235	| pi
+	.extend	0,0,0,0,0,0,0,0,0,0
+	.long	0x00003ffd,0x9a209a84,0xfbcff798	| log10(2)
+	.long	0x00004000,0xadf85458,0xa2bb4a9a	| e
+	.long	0x00003fff,0xb8aa3b29,0x5c17f0bc	| log2(e)
+	.long	0x00003ffd,0xde5bd8a9,0x37287195	| log10(e)
+	.long	0x00000000,0x00000000,0x00000000	| 0.0
+	.long	0x00003ffe,0xb17217f7,0xd1cf79ac	| 1n(2)
+	.long	0x00004000,0x935d8ddd,0xaaa8ac17	| 1n(10)
+	| read this as "1.0 * 2^0" - note the high bit in the mantissa
+	.long	0x00003fff,0x80000000,0x00000000	| 10^0
+	.long	0x00004002,0xa0000000,0x00000000	| 10^1
+	.long	0x00004005,0xc8000000,0x00000000	| 10^2
+	.long	0x0000400c,0x9c400000,0x00000000	| 10^4
+	.long	0x00004019,0xbebc2000,0x00000000	| 10^8
+	.long	0x00004034,0x8e1bc9bf,0x04000000	| 10^16
+	.long	0x00004069,0x9dc5ada8,0x2b70b59e	| 10^32
+	.long	0x000040d3,0xc2781f49,0xffcfa6d5	| 10^64
+	.long	0x000041a8,0x93ba47c9,0x80e98ce0	| 10^128
+	.long	0x00004351,0xaa7eebfb,0x9df9de8e	| 10^256
+	.long	0x000046a3,0xe319a0ae,0xa60e91c7	| 10^512
+	.long	0x00004d48,0xc9767586,0x81750c17	| 10^1024
+	.long	0x00005a92,0x9e8b3b5d,0xc53d5de5	| 10^2048
+	.long	0x00007525,0xc4605202,0x8a20979b	| 10^4096
+	.previous
+
+fp_fmove_mem2fp:
+	printf	PINSTR,"fmove %p,%p\n",2,%a0,%a1
+	move.l	(%a1)+,(%a0)+
+	move.l	(%a1)+,(%a0)+
+	move.l	(%a1),(%a0)
+	subq.l	#8,%a0
+	rts
+
+fpa_fsglmul:
+	move.l	#fp_finalrounding_single_fast,(%sp)
+	jra	fp_fsglmul
+
+fpa_fsgldiv:
+	move.l	#fp_finalrounding_single_fast,(%sp)
+	jra	fp_fsgldiv
+
+.macro	fp_dosingleprec instr
+	printf	PINSTR,"single "
+	move.l	#fp_finalrounding_single,(%sp)
+	jra	\instr
+.endm
+
+.macro	fp_dodoubleprec instr
+	printf	PINSTR,"double "
+	move.l	#fp_finalrounding_double,(%sp)
+	jra	\instr
+.endm
+
+fp_fsmove:
+	fp_dosingleprec fp_fmove_mem2fp
+
+fp_fssqrt:
+	fp_dosingleprec fp_fsqrt
+
+fp_fdmove:
+	fp_dodoubleprec fp_fmove_mem2fp
+
+fp_fdsqrt:
+	fp_dodoubleprec fp_fsqrt
+
+fp_fsabs:
+	fp_dosingleprec fp_fabs
+
+fp_fsneg:
+	fp_dosingleprec fp_fneg
+
+fp_fdabs:
+	fp_dodoubleprec fp_fabs
+
+fp_fdneg:
+	fp_dodoubleprec fp_fneg
+
+fp_fsdiv:
+	fp_dosingleprec fp_fdiv
+
+fp_fsadd:
+	fp_dosingleprec fp_fadd
+
+fp_fsmul:
+	fp_dosingleprec fp_fmul
+
+fp_fddiv:
+	fp_dodoubleprec fp_fdiv
+
+fp_fdadd:
+	fp_dodoubleprec fp_fadd
+
+fp_fdmul:
+	fp_dodoubleprec fp_fmul
+
+fp_fssub:
+	fp_dosingleprec fp_fsub
+
+fp_fdsub:
+	fp_dodoubleprec fp_fsub
+
+fp_nonstd:
+	fp_get_pc %a0
+	getuser.l (%a0),%d0,fp_err_ua1,%a0
+	printf	,"nonstd ((%08x)=%08x)\n",2,%a0,%d0
+	moveq	#-1,%d0
+	rts
+
+	.data
+	.align	4
+
+	| data sizes corresponding to the operand formats
+fp_datasize:
+	.word	4, 4, 12, 12, 2, 8, 1, 0