Annotation of sys/arch/m68k/060sp/fplsp.doc, Revision 1.1.1.1
1.1 nbrk 1: #
2: # $OpenBSD: fplsp.doc,v 1.2 1996/05/30 22:14:06 niklas Exp $
3: # $NetBSD: fplsp.doc,v 1.2 1996/05/15 19:47:35 is Exp $
4: #
5:
6: #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7: # MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
8: # M68000 Hi-Performance Microprocessor Division
9: # M68060 Software Package Production Release
10: #
11: # M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 Motorola Inc.
12: # All rights reserved.
13: #
14: # THE SOFTWARE is provided on an "AS IS" basis and without warranty.
15: # To the maximum extent permitted by applicable law,
16: # MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
17: # INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
18: # FOR A PARTICULAR PURPOSE and any warranty against infringement with
19: # regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
20: # and any accompanying written materials.
21: #
22: # To the maximum extent permitted by applicable law,
23: # IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
24: # (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
25: # BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
26: # ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
27: #
28: # Motorola assumes no responsibility for the maintenance and support
29: # of the SOFTWARE.
30: #
31: # You are hereby granted a copyright license to use, modify, and distribute the
32: # SOFTWARE so long as this entire notice is retained without alteration
33: # in any modified and/or redistributed versions, and that such modified
34: # versions are clearly identified as such.
35: # No licenses are granted by implication, estoppel or otherwise under any
36: # patents or trademarks of Motorola, Inc.
37: #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
38:
39: 68060 FLOATING-POINT SOFTWARE PACKAGE (Library version)
40: --------------------------------------------------------
41:
42: The file fplsp.sa contains the "Library version" of the
43: 68060SP Floating-Point Software Package. The routines
44: included in this module can be used to emulate the
45: FP instructions not implemented in 68060 hardware. These
46: instructions normally take exception vector #11
47: "FP Unimplemented Instruction".
48:
49: By re-compiling a program that uses these instructions, and
50: making subroutine calls in place of the unimplemented
51: instructions, a program can avoid the overhead associated
52: with taking the exception.
53:
54: Release file format:
55: --------------------
56: The file fplsp.sa is essentially a hexadecimal image of the
57: release package. This is the ONLY format which will be supported.
58: The hex image was created by assembling the source code and
59: then converting the resulting binary output image into an
60: ASCII text file. The hexadecimal numbers are listed
61: using the Motorola Assembly Syntax assembler directive "dc.l"
62: (define constant longword). The file can be converted to other
63: assembly syntaxes by using any word processor with a global
64: search and replace function.
65:
66: To assist in assembling and linking this module with other modules,
67: the installer should add a symbolic label to the top of the file.
68: This will allow calling routines to access the entry points
69: of this package.
70:
71: The source code fplsp.s has also been included but only for
72: documentation purposes.
73:
74: Release file structure:
75: -----------------------
76: The file fplsp.sa contains an "Entry-Point" section and a
77: code section. The FPLSP has no "Call-Out" section. The first section
78: is the "Entry-Point" section. In order to access a function in the
79: package, a program must "bsr" or "jsr" to the location listed
80: below in "68060FPLSP entry points" that corresponds to the desired
81: function. A branch instruction located at the selected entry point
82: within the package will then enter the correct emulation code routine.
83:
84: The entry point addresses at the beginning of the package will remain
85: fixed so that a program calling the routines will not have to be
86: re-compiled with every new 68060FPLSP release.
87:
88: There are 3 entry-points for each instruction type: single precision,
89: double precision, and extended precision.
90:
91: As an example, the "fsin" library instruction can be passed an
92: extended precision operand if program executes:
93:
94: # fsin.x fp0
95:
96: fmovm.x &0x01,-(%sp) # pass operand on stack
97: bsr.l _060FPLSP_TOP+0x1a8 # branch to fsin routine
98: add.l &0xc,%sp # clear operand from stack
99:
100: Upon return, fp0 holds the correct result. The FPSR is
101: set correctly. The FPCR is unchanged. The FPIAR is undefined.
102:
103: Another example. This time, a dyadic operation:
104:
105: # frem.s %fp1,%fp0
106:
107: fmov.s %fp1,-(%sp) # pass src operand
108: fmov.s %fp0,-(%sp) # pass dst operand
109: bsr.l _060FPLSP_TOP+0x168 # branch to frem routine
110: addq.l &0x8,%sp # clear operands from stack
111:
112: Again, the result is returned in fp0. Note that BOTH operands
113: are passed in single precision format.
114:
115: Exception reporting:
116: --------------------
117: The package takes exceptions according to the FPCR value upon subroutine
118: entry. If an exception should be reported, then the package forces
119: this exception using implemented floating-point instructions.
120: For example, if the instruction being emulated should cause a
121: floating-point Operand Error exception, then the library routine
122: executes an FMUL of a zero and an infinity to force the OPERR
123: exception. Although the FPIAR will be undefined for the enabled
124: Operand Error exception handler, the user will at least be able
125: to record that the event occurred.
126:
127: Miscellaneous:
128: --------------
129: The package does not attempt to correctly emulate instructions
130: with Signalling NAN inputs. Use of SNANs should be avoided with
131: this package.
132:
133: The fabs/fadd/fdiv/fint/fintrz/fmul/fneg/fsqrt/fsub entry points
134: are provided for the convenience of older compilers that make
135: subroutine calls for all fp instructions. The code does NOT emulate
136: the instruction but rather simply executes it.
137:
138: 68060FPLSP entry points:
139: ------------------------
140: _060FPLSP_TOP:
141: 0x000: _060LSP__facoss_
142: 0x008: _060LSP__facosd_
143: 0x010: _060LSP__facosx_
144: 0x018: _060LSP__fasins_
145: 0x020: _060LSP__fasind_
146: 0x028: _060LSP__fasinx_
147: 0x030: _060LSP__fatans_
148: 0x038: _060LSP__fatand_
149: 0x040: _060LSP__fatanx_
150: 0x048: _060LSP__fatanhs_
151: 0x050: _060LSP__fatanhd_
152: 0x058: _060LSP__fatanhx_
153: 0x060: _060LSP__fcoss_
154: 0x068: _060LSP__fcosd_
155: 0x070: _060LSP__fcosx_
156: 0x078: _060LSP__fcoshs_
157: 0x080: _060LSP__fcoshd_
158: 0x088: _060LSP__fcoshx_
159: 0x090: _060LSP__fetoxs_
160: 0x098: _060LSP__fetoxd_
161: 0x0a0: _060LSP__fetoxx_
162: 0x0a8: _060LSP__fetoxm1s_
163: 0x0b0: _060LSP__fetoxm1d_
164: 0x0b8: _060LSP__fetoxm1x_
165: 0x0c0: _060LSP__fgetexps_
166: 0x0c8: _060LSP__fgetexpd_
167: 0x0d0: _060LSP__fgetexpx_
168: 0x0d8: _060LSP__fgetmans_
169: 0x0e0: _060LSP__fgetmand_
170: 0x0e8: _060LSP__fgetmanx_
171: 0x0f0: _060LSP__flog10s_
172: 0x0f8: _060LSP__flog10d_
173: 0x100: _060LSP__flog10x_
174: 0x108: _060LSP__flog2s_
175: 0x110: _060LSP__flog2d_
176: 0x118: _060LSP__flog2x_
177: 0x120: _060LSP__flogns_
178: 0x128: _060LSP__flognd_
179: 0x130: _060LSP__flognx_
180: 0x138: _060LSP__flognp1s_
181: 0x140: _060LSP__flognp1d_
182: 0x148: _060LSP__flognp1x_
183: 0x150: _060LSP__fmods_
184: 0x158: _060LSP__fmodd_
185: 0x160: _060LSP__fmodx_
186: 0x168: _060LSP__frems_
187: 0x170: _060LSP__fremd_
188: 0x178: _060LSP__fremx_
189: 0x180: _060LSP__fscales_
190: 0x188: _060LSP__fscaled_
191: 0x190: _060LSP__fscalex_
192: 0x198: _060LSP__fsins_
193: 0x1a0: _060LSP__fsind_
194: 0x1a8: _060LSP__fsinx_
195: 0x1b0: _060LSP__fsincoss_
196: 0x1b8: _060LSP__fsincosd_
197: 0x1c0: _060LSP__fsincosx_
198: 0x1c8: _060LSP__fsinhs_
199: 0x1d0: _060LSP__fsinhd_
200: 0x1d8: _060LSP__fsinhx_
201: 0x1e0: _060LSP__ftans_
202: 0x1e8: _060LSP__ftand_
203: 0x1f0: _060LSP__ftanx_
204: 0x1f8: _060LSP__ftanhs_
205: 0x200: _060LSP__ftanhd_
206: 0x208: _060LSP__ftanhx_
207: 0x210: _060LSP__ftentoxs_
208: 0x218: _060LSP__ftentoxd_
209: 0x220: _060LSP__ftentoxx_
210: 0x228: _060LSP__ftwotoxs_
211: 0x230: _060LSP__ftwotoxd_
212: 0x238: _060LSP__ftwotoxx_
213:
214: 0x240: _060LSP__fabss_
215: 0x248: _060LSP__fabsd_
216: 0x250: _060LSP__fabsx_
217: 0x258: _060LSP__fadds_
218: 0x260: _060LSP__faddd_
219: 0x268: _060LSP__faddx_
220: 0x270: _060LSP__fdivs_
221: 0x278: _060LSP__fdivd_
222: 0x280: _060LSP__fdivx_
223: 0x288: _060LSP__fints_
224: 0x290: _060LSP__fintd_
225: 0x298: _060LSP__fintx_
226: 0x2a0: _060LSP__fintrzs_
227: 0x2a8: _060LSP__fintrzd_
228: 0x2b0: _060LSP__fintrzx_
229: 0x2b8: _060LSP__fmuls_
230: 0x2c0: _060LSP__fmuld_
231: 0x2c8: _060LSP__fmulx_
232: 0x2d0: _060LSP__fnegs_
233: 0x2d8: _060LSP__fnegd_
234: 0x2e0: _060LSP__fnegx_
235: 0x2e8: _060LSP__fsqrts_
236: 0x2f0: _060LSP__fsqrtd_
237: 0x2f8: _060LSP__fsqrtx_
238: 0x300: _060LSP__fsubs_
239: 0x308: _060LSP__fsubd_
240: 0x310: _060LSP__fsubx_
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