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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [m68k/] [ifpsp060/] [fskeleton.S] - Blame information for rev 1782

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1 1623 jcastillo
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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|M68000 Hi-Performance Microprocessor Division
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|M68060 Software Package
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|Production Release P1.00 -- October 10, 1994
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|
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|M68060 Software Package Copyright © 1993, 1994 Motorola Inc.  All rights reserved.
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|
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|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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|To the maximum extent permitted by applicable law,
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|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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|and any warranty against infringement with regard to the SOFTWARE
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|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
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|
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|To the maximum extent permitted by applicable law,
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|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
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|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
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|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
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|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
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|
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|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
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|so long as this entire notice is retained without alteration in any modified and/or
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|redistributed versions, and that such modified versions are clearly identified as such.
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|No licenses are granted by implication, estoppel or otherwise under any patents
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|or trademarks of Motorola, Inc.
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|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| fskeleton.s
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|
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| This file contains:
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|       (1) example "Call-out"s
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|       (2) example package entry code
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|       (3) example "Call-out" table
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|
36
 
37
 
38
|################################
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| (1) EXAMPLE CALL-OUTS         #
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|                               #
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| _060_fpsp_done()              #
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| _060_real_ovfl()              #
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| _060_real_unfl()              #
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| _060_real_operr()             #
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| _060_real_snan()              #
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| _060_real_dz()                #
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| _060_real_inex()              #
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| _060_real_bsun()              #
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| _060_real_fline()             #
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| _060_real_fpu_disabled()      #
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| _060_real_trap()              #
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|################################
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54
|
55
| _060_fpsp_done():
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|
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| This is the main exit point for the 68060 Floating-Point
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| Software Package. For a normal exit, all 060FPSP routines call this
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| routine. The operating system can do system dependent clean-up or
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| simply execute an "rte" as with the sample code below.
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|
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        .global         _060_fpsp_done
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_060_fpsp_done:
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        rte
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66
|
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| _060_real_ovfl():
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|
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| This is the exit point for the 060FPSP when an enabled overflow exception
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| is present. The routine below should point to the operating system handler
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| for enabled overflow conditions. The exception stack frame is an overflow
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| stack frame. The FP state frame holds the EXCEPTIONAL OPERAND.
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|
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| The sample routine below simply clears the exception status bit and
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| does an "rte".
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|
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        .global         _060_real_ovfl
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_060_real_ovfl:
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        fsave           -(%sp)
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        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
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84
|
85
| _060_real_unfl():
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|
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| This is the exit point for the 060FPSP when an enabled underflow exception
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| is present. The routine below should point to the operating system handler
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| for enabled underflow conditions. The exception stack frame is an underflow
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| stack frame. The FP state frame holds the EXCEPTIONAL OPERAND.
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|
92
| The sample routine below simply clears the exception status bit and
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| does an "rte".
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|
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        .global         _060_real_unfl
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_060_real_unfl:
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        fsave           -(%sp)
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        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
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102
|
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| _060_real_operr():
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|
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| This is the exit point for the 060FPSP when an enabled operand error exception
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| is present. The routine below should point to the operating system handler
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| for enabled operand error exceptions. The exception stack frame is an operand error
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| stack frame. The FP state frame holds the source operand of the faulting
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| instruction.
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|
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| The sample routine below simply clears the exception status bit and
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| does an "rte".
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|
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        .global         _060_real_operr
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_060_real_operr:
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        fsave           -(%sp)
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        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
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121
|
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| _060_real_snan():
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|
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| This is the exit point for the 060FPSP when an enabled signalling NaN exception
125
| is present. The routine below should point to the operating system handler
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| for enabled signalling NaN exceptions. The exception stack frame is a signalling NaN
127
| stack frame. The FP state frame holds the source operand of the faulting
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| instruction.
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|
130
| The sample routine below simply clears the exception status bit and
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| does an "rte".
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|
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        .global         _060_real_snan
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_060_real_snan:
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        fsave           -(%sp)
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        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
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140
|
141
| _060_real_dz():
142
|
143
| This is the exit point for the 060FPSP when an enabled divide-by-zero exception
144
| is present. The routine below should point to the operating system handler
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| for enabled divide-by-zero exceptions. The exception stack frame is a divide-by-zero
146
| stack frame. The FP state frame holds the source operand of the faulting
147
| instruction.
148
|
149
| The sample routine below simply clears the exception status bit and
150
| does an "rte".
151
|
152
        .global         _060_real_dz
153
_060_real_dz:
154
        fsave           -(%sp)
155
        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
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159
|
160
| _060_real_inex():
161
|
162
| This is the exit point for the 060FPSP when an enabled inexact exception
163
| is present. The routine below should point to the operating system handler
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| for enabled inexact exceptions. The exception stack frame is an inexact
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| stack frame. The FP state frame holds the source operand of the faulting
166
| instruction.
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|
168
| The sample routine below simply clears the exception status bit and
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| does an "rte".
170
|
171
        .global         _060_real_inex
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_060_real_inex:
173
        fsave           -(%sp)
174
        move.w          #0x6000,0x2(%sp)
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        frestore        (%sp)+
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        rte
177
 
178
|
179
| _060_real_bsun():
180
|
181
| This is the exit point for the 060FPSP when an enabled bsun exception
182
| is present. The routine below should point to the operating system handler
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| for enabled bsun exceptions. The exception stack frame is a bsun
184
| stack frame.
185
|
186
| The sample routine below clears the exception status bit, clears the NaN
187
| bit in the FPSR, and does an "rte". The instruction that caused the
188
| bsun will now be re-executed but with the NaN FPSR bit cleared.
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|
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        .global         _060_real_bsun
191
_060_real_bsun:
192
        fsave           -(%sp)
193
 
194
        fmove.l         %fpsr,-(%sp)
195
        andi.b          #0xfe,(%sp)
196
        fmove.l         (%sp)+,%fpsr
197
 
198
        add.l           #0xc,%sp
199
        rte
200
 
201
|
202
| _060_real_fline():
203
|
204
| This is the exit point for the 060FPSP when an F-Line Illegal exception is
205
| encountered. Three different types of exceptions can enter the F-Line exception
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| vector number 11: FP Unimplemented Instructions, FP implemented instructions when
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| the FPU is disabled, and F-Line Illegal instructions. The 060FPSP module
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| _fpsp_fline() distinguishes between the three and acts appropriately. F-Line
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| Illegals branch here.
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|
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        .global         _060_real_fline
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_060_real_fline:
213
        bras            _060_real_fline
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|
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| _060_real_fpu_disabled():
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|
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| This is the exit point for the 060FPSP when an FPU disabled exception is
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| encountered. Three different types of exceptions can enter the F-Line exception
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| vector number 11: FP Unimplemented Instructions, FP implemented instructions when
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| the FPU is disabled, and F-Line Illegal instructions. The 060FPSP module
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| _fpsp_fline() distinguishes between the three and acts appropriately. FPU disabled
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| exceptions branch here.
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|
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| The sample code below enables the FPU, sets the PC field in the exception stack
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| frame to the PC of the instruction causing the exception, and does an "rte".
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| The execution of the instruction then proceeds with an enabled floating-point
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| unit.
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|
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        .global         _060_real_fpu_disabled
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_060_real_fpu_disabled:
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        move.l          %d0,-(%sp)              | enabled the fpu
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        .long   0x4E7A0808
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        |movec          pcr,d0
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        bclr            #0x1,%d0
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        .long   0x4E7B0808
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        |movec          %d0,pcr
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        move.l          (%sp)+,%d0
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        move.l          0xc(%sp),0x2(%sp)       | set "Current PC"
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        rte
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|
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| _060_real_trap():
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|
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| This is the exit point for the 060FPSP when an emulated "ftrapcc" instruction
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| discovers that the trap condition is true and it should branch to the operating
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| system handler for the trap exception vector number 7.
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|
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| The sample code below simply executes an "rte".
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|
252
        .global         _060_real_trap
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_060_real_trap:
254
        rte
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256
|############################################################################
257
 
258
|#################################
259
| (2) EXAMPLE PACKAGE ENTRY CODE #
260
|#################################
261
 
262
        .global         _060_fpsp_snan
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_060_fpsp_snan:
264
        bra.l           _FP_CALL_TOP+0x80+0x00
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266
        .global         _060_fpsp_operr
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_060_fpsp_operr:
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        bra.l           _FP_CALL_TOP+0x80+0x08
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270
        .global         _060_fpsp_ovfl
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_060_fpsp_ovfl:
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        bra.l           _FP_CALL_TOP+0x80+0x10
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274
        .global         _060_fpsp_unfl
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_060_fpsp_unfl:
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        bra.l           _FP_CALL_TOP+0x80+0x18
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278
        .global         _060_fpsp_dz
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_060_fpsp_dz:
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        bra.l           _FP_CALL_TOP+0x80+0x20
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282
        .global         _060_fpsp_inex
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_060_fpsp_inex:
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        bra.l           _FP_CALL_TOP+0x80+0x28
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286
        .global         _060_fpsp_fline
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_060_fpsp_fline:
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        bra.l           _FP_CALL_TOP+0x80+0x30
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290
        .global         _060_fpsp_unsupp
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_060_fpsp_unsupp:
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        bra.l           _FP_CALL_TOP+0x80+0x38
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294
        .global         _060_fpsp_effadd
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_060_fpsp_effadd:
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        bra.l           _FP_CALL_TOP+0x80+0x40
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298
|############################################################################
299
 
300
|###############################
301
| (3) EXAMPLE CALL-OUT SECTION #
302
|###############################
303
 
304
| The size of this section MUST be 128 bytes!!!
305
 
306
        .global _FP_CALL_TOP
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_FP_CALL_TOP:
308
        .long   _060_real_bsun          - _FP_CALL_TOP
309
        .long   _060_real_snan          - _FP_CALL_TOP
310
        .long   _060_real_operr         - _FP_CALL_TOP
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        .long   _060_real_ovfl          - _FP_CALL_TOP
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        .long   _060_real_unfl          - _FP_CALL_TOP
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        .long   _060_real_dz            - _FP_CALL_TOP
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        .long   _060_real_inex          - _FP_CALL_TOP
315
        .long   _060_real_fline         - _FP_CALL_TOP
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        .long   _060_real_fpu_disabled  - _FP_CALL_TOP
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        .long   _060_real_trap          - _FP_CALL_TOP
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        .long   _060_real_trace         - _FP_CALL_TOP
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        .long   _060_real_access        - _FP_CALL_TOP
320
        .long   _060_fpsp_done          - _FP_CALL_TOP
321
 
322
        .long   0x00000000, 0x00000000, 0x00000000
323
 
324
        .long   _060_imem_read          - _FP_CALL_TOP
325
        .long   _060_dmem_read          - _FP_CALL_TOP
326
        .long   _060_dmem_write         - _FP_CALL_TOP
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        .long   _060_imem_read_word     - _FP_CALL_TOP
328
        .long   _060_imem_read_long     - _FP_CALL_TOP
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        .long   _060_dmem_read_byte     - _FP_CALL_TOP
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        .long   _060_dmem_read_word     - _FP_CALL_TOP
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        .long   _060_dmem_read_long     - _FP_CALL_TOP
332
        .long   _060_dmem_write_byte    - _FP_CALL_TOP
333
        .long   _060_dmem_write_word    - _FP_CALL_TOP
334
        .long   _060_dmem_write_long    - _FP_CALL_TOP
335
 
336
        .long   0x00000000
337
 
338
        .long   0x00000000, 0x00000000, 0x00000000, 0x00000000
339
 
340
|############################################################################
341
 
342
| 060 FPSP KERNEL PACKAGE NEEDS TO GO HERE!!!
343
 
344
        .include "fpsp.sa"

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