X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..0c530ab8987f0ae6a1a3d9284f40182b88852816:/osfmk/ppc/Emulate.s diff --git a/osfmk/ppc/Emulate.s b/osfmk/ppc/Emulate.s index f7037e6af..7a4ef3ab9 100644 --- a/osfmk/ppc/Emulate.s +++ b/osfmk/ppc/Emulate.s @@ -3,22 +3,19 @@ * * @APPLE_LICENSE_HEADER_START@ * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * 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 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. 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 + * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. - * Please see the License for the specific language governing rights and - * limitations under the License. + * 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@ */ @@ -32,10 +29,10 @@ */ -#include #include #include #include +#include #include #include @@ -221,9 +218,11 @@ LEXT(AlignAssist) 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 @@ -335,15 +334,11 @@ aaComExGo: b EXT(EmulExit) ; We are done, no tracing on... ; ; 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 @@ -364,9 +359,7 @@ aaNotFloat: ; ; 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 @@ -958,9 +951,17 @@ aaSthbrx: .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 @@ -997,6 +998,8 @@ aaDcbzXit: mr r4,r0 ; Save the DAR if we failed the access ; aaPassAlong: + li r0,1 ; Indicate that we failed to emulate + stw r0,savemisc3(r13) ; Assume that we emulate ok b EXT(EmulExit)