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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/fpsp040/x_unsupp.S
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+|
+| x_unsupp.sa 3.3 7/1/91
+|
+| fpsp_unsupp --- FPSP handler for unsupported data type exception
+|
+| Trap vector #55 (See table 8-1 Mc68030 User's manual).
+| Invoked when the user program encounters a data format (packed) that
+| hardware does not support or a data type (denormalized numbers or un-
+| normalized numbers).
+| Normalizes denorms and unnorms, unpacks packed numbers then stores
+| them back into the machine to let the 040 finish the operation.
+|
+| Unsupp calls two routines:
+| 1. get_op - gets the operand(s)
+| 2. res_func - restore the function back into the 040 or
+| if fmove.p fpm,<ea> then pack source (fpm)
+| and store in users memory <ea>.
+|
+| Input: Long fsave stack frame
+|
+|
+
+| Copyright (C) Motorola, Inc. 1990
+| All Rights Reserved
+|
+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
+| The copyright notice above does not evidence any
+| actual or intended publication of such source code.
+
+X_UNSUPP: |idnt 2,1 | Motorola 040 Floating Point Software Package
+
+ |section 8
+
+#include "fpsp.h"
+
+ |xref get_op
+ |xref res_func
+ |xref gen_except
+ |xref fpsp_fmt_error
+
+ .global fpsp_unsupp
+fpsp_unsupp:
+|
+ link %a6,#-LOCAL_SIZE
+ fsave -(%a7)
+ moveml %d0-%d1/%a0-%a1,USER_DA(%a6)
+ fmovemx %fp0-%fp3,USER_FP0(%a6)
+ fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
+
+
+ moveb (%a7),VER_TMP(%a6) |save version number
+ moveb (%a7),%d0 |test for valid version num
+ andib #0xf0,%d0 |test for $4x
+ cmpib #VER_4,%d0 |must be $4x or exit
+ bnel fpsp_fmt_error
+
+ fmovel #0,%FPSR |clear all user status bits
+ fmovel #0,%FPCR |clear all user control bits
+|
+| The following lines are used to ensure that the FPSR
+| exception byte and condition codes are clear before proceeding,
+| except in the case of fmove, which leaves the cc's intact.
+|
+unsupp_con:
+ movel USER_FPSR(%a6),%d1
+ btst #5,CMDREG1B(%a6) |looking for fmove out
+ bne fmove_con
+ andl #0xFF00FF,%d1 |clear all but aexcs and qbyte
+ bras end_fix
+fmove_con:
+ andl #0x0FFF40FF,%d1 |clear all but cc's, snan bit, aexcs, and qbyte
+end_fix:
+ movel %d1,USER_FPSR(%a6)
+
+ st UFLG_TMP(%a6) |set flag for unsupp data
+
+ bsrl get_op |everything okay, go get operand(s)
+ bsrl res_func |fix up stack frame so can restore it
+ clrl -(%a7)
+ moveb VER_TMP(%a6),(%a7) |move idle fmt word to top of stack
+ bral gen_except
+|
+ |end