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- Start rosapps rearrange and cleanup process.
svn path=/trunk/; revision=34303
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Aleksey Bragin
parent
0a0a13a41c
commit
2012315e5a
1206 changed files with 81 additions and 81 deletions
402
rosapps/applications/sysutils/utils/pice/module/pgflt.c
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402
rosapps/applications/sysutils/utils/pice/module/pgflt.c
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/*++
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Copyright (c) 1998-2001 Klaus P. Gerlicher
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Module Name:
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pgflt.c
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Abstract:
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page fault handling on x86
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Environment:
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Kernel mode only
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Author:
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Klaus P. Gerlicher
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Revision History:
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25-Nov-1999: created
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15-Nov-2000: general cleanup of source files
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Copyright notice:
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This file may be distributed under the terms of the GNU Public License.
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--*/
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////////////////////////////////////////////////////
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// INCLUDES
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////
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#include "remods.h"
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#include "precomp.h"
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////////////////////////////////////////////////////
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// GLOBALS
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////
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char tempPageFault[1024];
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extern void NewInt31Handler(void);
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ULONG OldIntEHandler=0;
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ULONG error_code;
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BOOLEAN bInPageFaultHandler = FALSE;
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static ULONG PCR_SEL = PCR_SELECTOR;
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static ULONG OLD_PCR;
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////////////////////////////////////////////////////
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// FUNCTIONS
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////
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//*************************************************************************
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// HandleInDebuggerFault()
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//
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//*************************************************************************
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ULONG HandleInDebuggerFault(FRAME* ptr,ULONG address)
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{
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PEPROCESS tsk;
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ENTER_FUNC();
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DPRINT((0,"HandleInDebuggerFault(): ###### page fault @ %.8X while inside debugger, eip: %x\n",address, ptr->eip));
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// fault in this page fault handler
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if(bInPageFaultHandler)
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{
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DPRINT((0,"HandleInDebuggerFault(): ###### page fault @ %.8X while in page fault handler\n",address));
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DPRINT((0,"!!! machine is halted !!!\n"));
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__asm__ __volatile__ ("hlt");
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LEAVE_FUNC();
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return 0;
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}
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bInPageFaultHandler = TRUE;
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// when we come here from DebuggerShell() we live on a different stack
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// so the current task is different as well
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tsk = IoGetCurrentProcess();
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DPRINT((0,"%.8X (%.4X:%.8X %.8X %s %s %s task=%.8X )\n",
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address,
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ptr->cs,
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ptr->eip,
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ptr->eflags,
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(ptr->error_code&1)?"PLP":"NP",
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(ptr->error_code&2)?"WRITE":"READ",
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(ptr->error_code&4)?"USER-MODE":"KERNEL-MODE",
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(ULONG)tsk));
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if(!bInPrintk)
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{
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DPRINT((0,"HandleInDebuggerFault(): unexpected pagefault in command handler!\n",address));
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}
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else
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{
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DPRINT((0,"HandleInDebuggerFault(): unexpected pagefault in command handler while in PrintkCallback()!\n",address));
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}
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if(tsk)
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{
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PULONG pPGD;
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PULONG pPTE;
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pPGD = ADDR_TO_PDE(address);
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DPRINT((0,"PGD for %.8X @ %.8X = %.8X\n",address,(ULONG)pPGD,(ULONG)(*pPGD) ));
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if(pPGD && (*pPGD)&_PAGE_PRESENT)
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{
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// not large page
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if(!((*pPGD)&_PAGE_4M))
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{
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pPTE = ADDR_TO_PTE(address);
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if(pPTE)
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{
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DPRINT((0,"PTE for %.8X @ %.8X = %.8X\n",address,(ULONG)pPTE,(ULONG)(*pPTE) ));
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}
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}
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}
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}
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IntelStackWalk(ptr->eip,CurrentEBP,ulRealStackPtr);
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DPRINT((0,"!!! machine is halted !!!\n"));
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__asm__ __volatile__ ("hlt");
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LEAVE_FUNC();
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return 2;
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}
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//*************************************************************************
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// HandlePageFault()
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//
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// returns:
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// 0 = let the system handle it
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// 1 = call DebuggerShell()
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// 2 = FATAL error inside debugger
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//*************************************************************************
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ULONG HandlePageFault(FRAME* ptr)
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{
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PVOID address;
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PEPROCESS tsk, tsk1;
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PMADDRESS_SPACE vma;
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PLIST_ENTRY current_entry;
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MEMORY_AREA* current;
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ULONG value;
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PKTHREAD CurrentThread;
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PETHREAD CurrentEThread;
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// get linear address of page fault
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__asm__ __volatile__("movl %%cr2,%0"
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:"=r" (address));
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DPRINT((0,"\nPageFault: bInDebShell: %d, error: %d, addr: %x\n", bInDebuggerShell, ptr->error_code, address));
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// there's something terribly wrong if we get a fault in our command handler
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if(bInDebuggerShell)
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{
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DPRINT((0,"return handleindebuggerfault\n"));
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return HandleInDebuggerFault(ptr,(ULONG)address);
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}
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ASSERT(IsAddressValid((ULONG)ptr));
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// remember error code so we can push it back on the stack
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error_code = ptr->error_code;
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//ei Check IRQL here!!!
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/*
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if(in_interrupt())
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{
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Print(OUTPUT_WINDOW,"pICE: system is currently processing an interrupt!\n");
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return 1;
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}
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*/
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// current process
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tsk = IoGetCurrentProcess();
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DPRINT((0,"tsk: %x\t", tsk));
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if( !tsk || !(IsAddressValid((ULONG)tsk))){
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DPRINT((0,"tsk address not valid: tsk: %x\n", tsk));
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return 0;
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}
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// lookup VMA for this address
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if( (ULONG)address > KERNEL_BASE )
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vma = my_init_mm; // use kernel mem area for kernel addresses
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else vma = &(tsk->AddressSpace); // otherwise, use user memory area
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if( !vma ){
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DPRINT((0,"vma not valid: vma: %x\n", vma));
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return 0;
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}
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current_entry = vma->MAreaListHead.Flink;
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ASSERT(current_entry);
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DPRINT((0,"vma: %x, current_entry: %x, kernel arena: %x\n", vma, current_entry, my_init_mm));
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while(current_entry != &vma->MAreaListHead)
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{
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ASSERT(current_entry);
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ASSERT(IsAddressValid((ULONG)current_entry));
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current = CONTAINING_RECORD(current_entry,
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MEMORY_AREA,
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Entry);
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if( (address >= current->BaseAddress) && (address <= current->BaseAddress + current->Length ))
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{
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DPRINT((0,"address: %x %x - %x Attrib: %x, Type: %x\n", address, current->BaseAddress, current->BaseAddress + current->Length, current->Attributes, current->Type));
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//page not present
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if( !(error_code & 1) ){
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//check it is in pageable area
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if( current->Type == MEMORY_AREA_SECTION_VIEW ||
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current->Type == MEMORY_AREA_VIRTUAL_MEMORY ||
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current->Type == MEMORY_AREA_PAGED_POOL ||
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current->Type == MEMORY_AREA_SHARED_DATA
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){
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//ei too much output Print(OUTPUT_WINDOW,"pICE: VMA Pageable Section.\n");
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//ei DPRINT((0,"return 0 1\n"));
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return 0; //let the system handle this
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}
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Print(OUTPUT_WINDOW,"pICE: VMA Page not present in non-pageable Section!\n");
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//ei DPRINT((0,"Type: currenttype: %x return 1 2\n", current->Type));
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return 0;
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}
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else{ //access violation
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if( error_code & 4 )
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{ //user mode
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if( (ULONG)address >= KERNEL_BASE )
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{
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Print(OUTPUT_WINDOW,"pICE: User mode program trying to access kernel memory!\n");
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//DPRINT((0,"return 0 3\n"));
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return 1;
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}
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//DPRINT((0,"return 0 4\n"));
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return 0;
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}
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/*
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if(error_code & 2)
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{
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//on write
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if(!(current->Attributes & PAGE_READONLY))
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{
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Print(OUTPUT_WINDOW,"pICE: virtual memory arena is not writeable!\n");
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return 1;
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}
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}
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// READ ACCESS
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else
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{
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// test EXT bit in error code
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if (error_code & 1)
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{
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Print(OUTPUT_WINDOW,"pICE: page-level protection fault!\n");
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return 1;
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}
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//
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*/
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/*
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if (!(current->Attributes & PAGE_EXECUTE_READ))
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{
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Print(OUTPUT_WINDOW,"pICE: VMA is not readable!\n");
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return 1;
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}
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*/
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// let the system handle it
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//DPRINT((0,"return 0 5\n"));
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return 0;
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}
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}
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current_entry = current_entry->Flink;
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}
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Print(OUTPUT_WINDOW,"pICE: no virtual memory arena at this address!\n");
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DPRINT((0,"return 0 6\n"));
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return 1;
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// let the system handle it
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// return 0;
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}
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//*************************************************************************
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// NewIntEHandler()
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//
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//*************************************************************************
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__asm__ ("\n\t \
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NewIntEHandler:\n\t \
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pushfl\n\t \
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cli\n\t \
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cld\n\t \
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pushal\n\t \
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pushl %ds\n\t \
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\n\t \
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// setup default data selectors\n\t \
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movw %ss,%ax\n\t \
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movw %ax,%ds\n\t \
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\n\t \
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/*\n\t \
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* Load the PCR selector.\n\t \
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*/\n\t \
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movl %fs, %eax\n\t \
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movl %eax, _OLD_PCR\n\t \
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movl _PCR_SEL, %eax\n\t \
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movl %eax, %fs\n\t \
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\n\t \
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// get frame ptr\n\t \
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lea 40(%esp),%eax\n\t \
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pushl %eax\n\t \
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call _HandlePageFault\n\t \
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addl $4,%esp\n\t \
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\n\t \
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pushl %eax\n\t \
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movl _OLD_PCR, %eax\n\t \
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movl %eax, %fs\n\t \
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popl %eax\n\t \
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\n\t \
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cmpl $0,%eax\n\t \
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je call_old_inte_handler\n\t \
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\n\t \
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cmpl $2,%eax\n\t \
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je call_handler_unknown_reason\n\t \
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\n\t \
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popl %ds\n\t \
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popal\n\t \
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popfl\n\t \
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// remove error code. will be restored later when we call\n\t \
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// original handler again.\n\t \
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addl $4,%esp\n\t \
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// call debugger loop\n\t \
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pushl $" STR(REASON_PAGEFAULT) "\n\t \
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jmp NewInt31Handler\n\t \
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\n\t \
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call_old_inte_handler:\n\t \
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popl %ds\n\t \
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popal\n\t \
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popfl\n\t \
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// chain to old handler\n\t \
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.byte 0x2e\n\t \
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jmp *_OldIntEHandler\n\t \
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\n\t \
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call_handler_unknown_reason:\n\t \
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popl %ds\n\t \
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popal\n\t \
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popfl\n\t \
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// remove error code. will be restored later when we call\n\t \
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// original handler again.\n\t \
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addl $4,%esp\n\t \
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// call debugger loop\n\t \
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pushl $" STR(REASON_INTERNAL_ERROR) "\n\t \
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jmp NewInt31Handler\n\t \
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");
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//*************************************************************************
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// InstallIntEHook()
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//
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//*************************************************************************
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void InstallIntEHook(void)
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{
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ULONG LocalIntEHandler;
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ENTER_FUNC();
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MaskIrqs();
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if(!OldIntEHandler)
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{
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__asm__ __volatile__("mov $NewIntEHandler,%0"
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:"=r" (LocalIntEHandler)
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:
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:"eax");
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OldIntEHandler=SetGlobalInt(0x0E,(ULONG)LocalIntEHandler);
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}
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UnmaskIrqs();
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DPRINT((0,"OldIntE @ %x\n", OldIntEHandler));
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LEAVE_FUNC();
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}
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//*************************************************************************
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// DeInstallIntEHook()
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//
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//*************************************************************************
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void DeInstallIntEHook(void)
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{
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ENTER_FUNC();
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MaskIrqs();
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if(OldIntEHandler)
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{
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SetGlobalInt(0x0E,(ULONG)OldIntEHandler);
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OldIntEHandler=0;
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}
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UnmaskIrqs();
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LEAVE_FUNC();
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}
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