/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the
+ * License may not be used to create, or enable the creation or
+ * redistribution of, unlawful or unlicensed copies of an Apple operating
+ * system, or to circumvent, violate, or enable the circumvention or
+ * violation of, any terms of an Apple operating system software license
+ * agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
*/
/*
Emulate.s
*/
-#include <cpus.h>
#include <ppc/asm.h>
#include <ppc/proc_reg.h>
#include <ppc/exception.h>
+#include <ppc/cpu_capabilities.h>
#include <mach/machine/vm_param.h>
#include <assym.s>
b EXT(AlignAssist64) ; Jump to the 64-bit code...
aan64: lwz r20,savedsisr(r13) ; Get the DSISR
+ li r0,0 ; Assume we emulate
mfsprg r31,0 ; Get the per_proc
mtcrf 0x10,r20 ; Put instruction ID in CR for later
lwz r21,spcFlags(r31) ; Grab the special flags
+ stw r0,savemisc3(r13) ; Assume that we emulate ok
mtcrf 0x08,r20 ; Put instruction ID in CR for later
rlwinm. r0,r21,0,runningVMbit,runningVMbit ; Are we running a VM?
mtcrf 0x04,r20 ; Put instruction ID in CR for later
;
; This is not a floating point operation
;
-; The emulation routines for these are positioned every 64 bytes (16 instructions)
-; in a 1024-byte aligned table. It is indexed by taking the low order 4 bits of
+; The table of these emulation routines is indexed by taking the low order 4 bits of
; the instruction code in the DSISR and subtracting 7. If this comes up negative,
; the instruction is not to be emulated. Then we add bit 0 of the code * 4. This
; gives us a fairly compact and almost unique index. Both lwm and stmw map to 0 so
-; that one needs to be further reduced, and we end up with holes at index 6, 8, and 10.
-;
-; If the emulation routine takes more than 16 instructions, it must branch elsewhere
-; to finish up.
+; that one needs to be further reduced, and we end up with holes at a few indexes.
;
.align 5
;
; This is the table of non-floating point emulation routines.
-; It is indexed by low 4 bits of DSISR op type - 7 + bit 0 of
-; op type * 4
-;
+; It is indexed by the code immediately above.
.align 5
.align 5
-aaDcbz:
- rlwinm r23,r23,0,0,26 ; Round back to a 32-byte boundary
-
+aaDcbz:
+ lwz r0,savesrr0+4(r13) ; get instruction address
+ li r4,_COMM_PAGE_BASE_ADDRESS
+ rlwinm r23,r23,0,0,26 ; Round EA back to a 32-byte boundary
+ sub r4,r0,r4 ; compute instruction offset from base of commpage
+ cmplwi r4,_COMM_PAGE_AREA_USED ; did fault occur in commpage?
+ bge+ aaDcbz1 ; skip if not in commpage
+ lwz r4,savecr(r13) ; if we take a dcbz in the commpage...
+ rlwinm r4,r4,0,0,27 ; ...clear users cr7 as a flag for commpage code
+ stw r4,savecr(r13)
+aaDcbz1:
crset cr0_eq ; Set this to see if we failed
li r0,0 ; Clear this out
mtmsr r22 ; Flip DR, RI, and maybe PR on
;
aaPassAlong:
+ li r0,1 ; Indicate that we failed to emulate
+ stw r0,savemisc3(r13) ; Assume that we emulate ok
b EXT(EmulExit)
projects / apple / xnu.git / blobdiff