--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/flexible/arm/xipc.cia Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,145 @@
+// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#define INCLUDED_FROM_ASM
+
+#include <e32cia.h>
+#include <arm_mem.h>
+#include "xdefs.h"
+
+#ifdef _DEBUG
+#define ASM_KILL_LINK(rp,rs) asm("mov "#rs", #0xdf ");\
+ asm("orr "#rs", "#rs", "#rs", lsl #8 ");\
+ asm("orr "#rs", "#rs", "#rs", lsl #16 ");\
+ asm("str "#rs", ["#rp"] ");\
+ asm("str "#rs", ["#rp", #4] ");
+#else
+#define ASM_KILL_LINK(rp,rs)
+#endif
+
+#ifdef _DEBUG
+extern "C" void __FaultIpcClientNotNull(); // defined in ckernel.cpp
+#endif
+
+
+__NAKED__ TInt DThread::ReadAndParseDesHeader(const TAny* aSrc, TDesHeader& aDest)
+ {
+ ASM_ASSERT_PAGING_SAFE;
+ // save state including 'this', aSrc and sDest. Double word aligns the stack
+ // which is required to call c++ functions.
+ asm("stmdb sp!, {r0-r2, r4-r8, r10, lr} ");
+
+ // Register use this method:
+ // r0 = 'this' until iIpcClient set.
+ // r1 = aSrc until read_and_parse_des_header_local.
+ // r2 = aDest until read_and_parse_des_header_local.
+ // r4 = target process
+ // r5 = current nthread
+ // r6 = scheduler.
+ // r7 = current process
+ // r8 = orig ttbr0
+ // r10 = os asid of current process.
+
+ // Open a reference on the target process's os asid as we will be switching to
+ // it so it can't be allowed to be freed and/or reused.
+ asm("ldr r4, [r0, #%a0]" : : "i" _FOFF(DThread,iOwningProcess)); // r4->target process
+ asm("bl " CSM_ZN5NKern13ThreadEnterCSEv); // First enter a critical section so can't leak os asid reference.
+ asm("mov r0, r4"); // r0 = target process ('this' for TryOpenOsAsid() below).
+ asm("bl " CSM_ZN16DMemModelProcess13TryOpenOsAsidEv);
+ // Check a reference could be opened on target process's os asid, failed if r0 < 0.
+ asm("cmp r0, #0");
+ asm("bmi readParseDesHeader_ExitErr");
+
+ asm("mov r10, r0"); // r10 = os asid of current process
+ asm("ldmia sp!, {r0-r2}"); // r0 = this, r1 = aSrc, r2 = aDest
+
+ __ASM_CLI(); // disable all interrupts
+#ifdef __SMP__
+ GET_RWNO_TID(,r6); // r6->TSubScheduler
+ asm("ldr r7, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace)); // r7->current process
+ asm("ldr r5, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iCurrentThread)); // r5->current NThreadBase
+#else
+ asm("ldr r6, __TheScheduler "); // r6->TheScheduler
+ asm("ldr r7, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace)); // r7->current process
+ asm("ldr r5, [r6, #%a0]" : : "i" _FOFF(TScheduler,iCurrentThread)); // r5->current NThreadBase
+#endif
+
+ // set TheCurrentThread->iIpcClient to this (r0) thread
+#ifdef _DEBUG
+ asm("ldr r12, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));
+ asm("teq r12, #0 ");
+ asm("bne __FaultIpcClientNotNull ");
+#endif
+ asm("str r0, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));
+
+ // switch address space to process r4...
+ asm("mrc p15, 0, r8, c2, c0, 0 "); // r8 = original TTBR0
+ asm("ldr r0, [r4, #%a0]" : : "i" _FOFF(DMemModelProcess,iPageDir)); // r0->target process page directory
+ asm("and lr, r8, #%a0" : : "i" ((TInt)KTTBRExtraBitsMask)); // lr = TTBR0 extra bits
+ asm("orr r0, r0, lr "); // r0 = target process page directory + extra bits
+
+ __ASM_SET_ADDRESS_SPACE(r10,r0,lr);
+#ifdef __SMP__
+ asm("str r4, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace));
+#else
+ asm("str r4, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace));
+#endif
+ asm("str r4, [r5, #%a0]" : : "i" _FOFF(NThread,iAddressSpace));
+ __ASM_STI(); // enable all interrupts
+
+ // read and parse descriptor header, r1=aSrc, r2=aDest
+ asm("bl read_and_parse_des_header_local"); // defined in e32/kernel/arm/cipc.cia
+
+ // restore address space to process r7...
+ asm("ldr r12, [r7, #%a0]" : : "i" _FOFF(DMemModelProcess,iOsAsid)); // r12 = current process ASID
+
+ __ASM_CLI(); // disable all interrupts
+ __ASM_SET_ADDRESS_SPACE(r12,r8,lr);
+#ifdef __SMP__
+ GET_RWNO_TID(,r6); // r6->TSubScheduler
+ asm("str r7, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace));
+#else
+ asm("str r7, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace));
+#endif
+ asm("str r7, [r5, #%a0]" : : "i" _FOFF(NThread,iAddressSpace));
+ __ASM_STI(); // enable all interrupts
+
+ // set TheCurrentThread->iIpcClient to NULL again
+ asm("mov r12, #0 ");
+ asm("str r12, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));
+
+ // close the reference on the target process's os asid.
+ asm("mov r6, r0"); // r6 = return value from read_and_parse_des_header_local
+ asm("mov r0, r4"); // r0 = target process
+ asm("bl " CSM_ZN16DMemModelProcess11CloseOsAsidEv);
+
+ // finished...
+ asm("bl " CSM_ZN5NKern13ThreadLeaveCSEv); // Os asid reference closed so leave critical section.
+ asm("mov r0, r6"); // r0 = return value from read_and_parse_des_header_local.
+ __POPRET("r4-r8, r10, "); // Restore the state and return.
+
+ // exit with error...
+ asm("readParseDesHeader_ExitErr:");
+ asm("bl " CSM_ZN5NKern13ThreadLeaveCSEv); // Os asid reference not open so leave critical section.
+ asm("mov r0, #%a0" : : "i" ((TInt)KErrBadDescriptor));
+ asm("add sp, sp, #12"); // pop r0-r2 off the stack.
+ __POPRET("r4-r8, r10, "); // Restore the state and return.
+
+#ifndef __SMP__
+ asm("__TheScheduler: ");
+ asm(".word TheScheduler ");
+#endif
+ }
+