mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-27 17:58:22 +00:00
e00d82d07f
Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Matt Waddel <Matt.Waddel@freescale.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
77 lines
2.0 KiB
ArmAsm
77 lines
2.0 KiB
ArmAsm
|
|
|
| x_unimp.sa 3.3 7/1/91
|
|
|
|
|
| fpsp_unimp --- FPSP handler for unimplemented instruction
|
|
| exception.
|
|
|
|
|
| Invoked when the user program encounters a floating-point
|
|
| op-code that hardware does not support. Trap vector# 11
|
|
| (See table 8-1 MC68030 User's Manual).
|
|
|
|
|
|
|
|
| Note: An fsave for an unimplemented inst. will create a short
|
|
| fsave stack.
|
|
|
|
|
| Input: 1. Six word stack frame for unimplemented inst, four word
|
|
| for illegal
|
|
| (See table 8-7 MC68030 User's Manual).
|
|
| 2. Unimp (short) fsave state frame created here by fsave
|
|
| instruction.
|
|
|
|
|
|
|
|
| Copyright (C) Motorola, Inc. 1990
|
|
| All Rights Reserved
|
|
|
|
|
| For details on the license for this file, please see the
|
|
| file, README, in this same directory.
|
|
|
|
X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package
|
|
|
|
|section 8
|
|
|
|
#include "fpsp.h"
|
|
|
|
|xref get_op
|
|
|xref do_func
|
|
|xref sto_res
|
|
|xref gen_except
|
|
|xref fpsp_fmt_error
|
|
|
|
.global fpsp_unimp
|
|
.global uni_2
|
|
fpsp_unimp:
|
|
link %a6,#-LOCAL_SIZE
|
|
fsave -(%a7)
|
|
uni_2:
|
|
moveml %d0-%d1/%a0-%a1,USER_DA(%a6)
|
|
fmovemx %fp0-%fp3,USER_FP0(%a6)
|
|
fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
|
|
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
|
|
|
|
|
| Temporary D25B Fix
|
|
| The following lines are used to ensure that the FPSR
|
|
| exception byte and condition codes are clear before proceeding
|
|
|
|
|
movel USER_FPSR(%a6),%d0
|
|
andl #0xFF00FF,%d0 |clear all but accrued exceptions
|
|
movel %d0,USER_FPSR(%a6)
|
|
fmovel #0,%FPSR |clear all user bits
|
|
fmovel #0,%FPCR |clear all user exceptions for FPSP
|
|
|
|
clrb UFLG_TMP(%a6) |clr flag for unsupp data
|
|
|
|
bsrl get_op |go get operand(s)
|
|
clrb STORE_FLG(%a6)
|
|
bsrl do_func |do the function
|
|
fsave -(%a7) |capture possible exc state
|
|
tstb STORE_FLG(%a6)
|
|
bnes no_store |if STORE_FLG is set, no store
|
|
bsrl sto_res |store the result in user space
|
|
no_store:
|
|
bral gen_except |post any exceptions and return
|
|
|
|
|end
|