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522 lines
17 KiB
522 lines
17 KiB
// TITLE("Trampoline Code For User Mode APC and Exception Dispatching")
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//++
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//
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// Copyright (c) 1990 Microsoft Corporation
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//
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// Module Name:
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//
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// trampoln.s
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//
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// Abstract:
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//
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// This module implements the trampoline code necessary to dispatch user
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// mode APCs and exceptions.
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//
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// Author:
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//
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// David N. Cutler (davec) 3-Apr-1990
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//
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// Environment:
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//
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// User mode only.
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//
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// Revision History:
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//
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//--
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#include "ksmips.h"
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//
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// Define length of exception dispatcher stack frame.
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//
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#define ExceptionDispatcherFrame (ExceptionRecordLength + ContextFrameLength)
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SBTTL("User APC Dispatcher")
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//++
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//
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// The following code is never executed. Its purpose is to support unwinding
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// through the call to the APC dispatcher.
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//
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//--
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EXCEPTION_HANDLER(KiUserApcHandler)
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NESTED_ENTRY(KiUserApcDispatch, ContextFrameLength, zero);
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.set noreorder
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.set noat
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sd sp,CxXIntSp(sp) // save stack pointer
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sd ra,CxXIntRa(sp) // save return address
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sw ra,CxFir(sp) // save return address
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sd s8,CxXIntS8(sp) // save integer register s8
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sd gp,CxXIntGp(sp) // save integer register gp
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sd s0,CxXIntS0(sp) // save integer registers s0 - s7
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sd s1,CxXIntS1(sp) //
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sd s2,CxXIntS2(sp) //
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sd s3,CxXIntS3(sp) //
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sd s4,CxXIntS4(sp) //
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sd s5,CxXIntS5(sp) //
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sd s6,CxXIntS6(sp) //
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sd s7,CxXIntS7(sp) //
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sdc1 f20,CxFltF20(sp) // store floating registers f20 - f31
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sdc1 f22,CxFltF22(sp) //
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sdc1 f24,CxFltF24(sp) //
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sdc1 f26,CxFltF26(sp) //
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sdc1 f28,CxFltF28(sp) //
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sdc1 f30,CxFltF30(sp) //
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move s8,sp // set frame pointer
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.set at
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.set reorder
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PROLOGUE_END
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//++
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//
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// VOID
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// KiUserApcDispatcher (
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// IN PVOID NormalContext,
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// IN PVOID SystemArgument1,
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// IN PVOID SystemArgument2,
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// IN PKNORMAL_ROUTINE NormalRoutine
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// )
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//
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// Routine Description:
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//
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// This routine is entered on return from kernel mode to deliver an APC
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// in user mode. The context frame for this routine was built when the
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// APC interrupt was processed and contains the entire machine state of
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// the current thread. The specified APC routine is called and then the
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// machine state is restored and execution is continued.
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//
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// Arguments:
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//
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// a0 - Supplies the normal context parameter that was specified when the
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// APC was initialized.
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//
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// a1 - Supplies the first argument that was provied by the executive when
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// the APC was queued.
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//
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// a2 - Supplies the second argument that was provided by the executive
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// when the APC was queued.
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//
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// a3 - Supplies that address of the function that is to be called.
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//
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// sp - Supplies a pointer to a context frame.
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//
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// s8 - Supplies the same value as sp and is used as a frame pointer.
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//
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// Return Value:
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//
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// None.
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//
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//--
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ALTERNATE_ENTRY(KiUserApcDispatcher)
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jal a3 // call specified APC routine
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move a0,s8 // set address of context frame
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li a1,1 // set test alert argument true
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jal ZwContinue // execute system service to continue
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//
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// Unsuccessful completion after attempting to continue execution. Use the
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// return status as the exception code, set noncontinuable exception and
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// attempt to raise another exception. Note their is not return from raise
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// status.
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//
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move s0,v0 // save status value
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10: move a0,s0 // set status value
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jal RtlRaiseStatus // raise exception
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b 10b // loop on return
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.end KiUserApcDispatch
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SBTTL("User APC Exception Handler")
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//++
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//
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// EXCEPTION_DISPOSITION
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// KiUserApcHandler (
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// IN PEXCEPTION_RECORD ExceptionRecord,
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// IN ULONG EstablisherFrame,
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// IN OUT PCONTEXT ContextRecord,
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// IN OUT PDISPATCHER_CONTEXT DispatcherContext
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//
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// Routine Description:
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//
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// This function is called when an exception occurs in an APC routine
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// or one of its dynamic descendents and when an unwind thought the
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// APC dispatcher is in progress. If an unwind is in progress, then test
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// alert is called to ensure that all currently queued APCs are executed.
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//
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// Arguments:
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//
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// ExceptionRecord (a0) - Supplies a pointer to an exception record.
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//
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// EstablisherFrame (a1) - Supplies the frame pointer of the establisher
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// of this exception handler.
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//
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// ContextRecord (a2) - Supplies a pointer to a context record.
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//
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// DispatcherContext (a3) - Supplies a pointer to the dispatcher context
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// record.
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//
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// Return Value:
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//
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// ExceptionContinueSearch is returned as the function value.
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//--
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.struct 0
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.space 4 * 4 // argument save area
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HdRa: .space 4 // saved return address
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.space 3 * 4 //
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HandlerFrameLength: // length of handler frame
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NESTED_ENTRY(KiUserApcHandler, HandlerFrameLength, zero)
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subu sp,sp,HandlerFrameLength // allocate stack frame
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sw ra,HdRa(sp) // save return address
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PROLOGUE_END
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lw t0,ErExceptionFlags(a0) // get exception flags
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and t0,t0,EXCEPTION_UNWIND // check if unwind in progress
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beq zero,t0,10f // if eq, no unwind in progress
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jal ZwTestAlert // test for alert pending
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10: li v0,ExceptionContinueSearch // set disposition value
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lw ra,HdRa(sp) // restore return address
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addu sp,sp,HandlerFrameLength // deallocate stack frame
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j ra // return
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.end KiUserApcHandler
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SBTTL("User Callback Dispatcher")
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//++
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//
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// The following code is never executed. Its purpose is to support unwinding
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// through the call to the APC dispatcher.
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//
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//--
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// EXCEPTION_HANDLER(KiUserCallbackHandler)
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NESTED_ENTRY(KiUserCallbackDispatch, ContextFrameLength, zero);
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.set noreorder
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.set noat
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sd sp,CkSp(sp) // save stack pointer
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sd ra,CkRa(sp) // save return address
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.set at
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.set reorder
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PROLOGUE_END
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//++
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//
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// VOID
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// KiUserCallbackDispatcher (
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// VOID
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// )
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//
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// Routine Description:
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//
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// This routine is entered on a callout from kernel mode to execute a
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// user mode callback function. All arguments for this function have
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// been placed on the stack.
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//
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// Arguments:
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//
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// (sp + ApiNumber) - Supplies the API number of the callback function
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// that is executed.
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//
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// (sp + Buffer) - Supplies a pointer to the input buffer.
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//
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// (sp + Length) - Supplies the input buffer length.
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//
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// Return Value:
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//
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// This function returns to kernel mode.
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//
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//--
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ALTERNATE_ENTRY(KiUserCallbackDispatcher)
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lw a0,CkBuffer(sp) // get input buffer address
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lw a1,CkLength(sp) // get input buffer length
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lw t0,CkApiNumber(sp) // get API number
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li t1,UsPcr // get user PCR page address
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lw t1,PcTeb(t1) // get address of TEB
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lw t2,TePeb(t1) // get address of PEB
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lw t3,PeKernelCallbackTable(t2) // get address of callback table
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sll t0,t0,2 // compute address of table entry
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addu t3,t3,t0 //
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lw t3,0(t3) // get address of callback routine
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jal t3 // call specified function
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//
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// If a return from the callback function occurs, then the output buffer
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// address and length are returned as NULL.
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//
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move a0,zero // set zero buffer address
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move a1,zero // set zero buffer lenfth
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move a2,v0 // set completion status
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jal ZwCallbackReturn // return to kernel mode
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//
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// Unsuccessful completion after attempting to return to kernel mode. Use
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// the return status as the exception code, set noncontinuable exception and
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// attempt to raise another exception. Note their is not return from raise
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// status.
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//
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10: move a0,v0 // set status value
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jal RtlRaiseStatus // raise exception
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b 10b // loop on return
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.end KiUserCallbackDispatch
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SBTTL("User Callback Exception Handler")
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//++
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//
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// EXCEPTION_DISPOSITION
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// KiUserCallbackHandler (
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// IN PEXCEPTION_RECORD ExceptionRecord,
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// IN ULONG EstablisherFrame,
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// IN OUT PCONTEXT ContextRecord,
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// IN OUT PDISPATCHER_CONTEXT DispatcherContext
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//
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// Routine Description:
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//
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// This function is called when an exception occurs in a user callback
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// routine or one of its dynamic descendents.
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//
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// Arguments:
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//
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// ExceptionRecord (a0) - Supplies a pointer to an exception record.
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//
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// EstablisherFrame (a1) - Supplies the frame pointer of the establisher
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// of this exception handler.
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//
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// ContextRecord (a2) - Supplies a pointer to a context record.
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//
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// DispatcherContext (a3) - Supplies a pointer to the dispatcher context
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// record.
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//
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// Return Value:
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//
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// ExceptionContinueSearch is returned as the function value.
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//--
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NESTED_ENTRY(KiUserCallbackHandler, HandlerFrameLength, zero)
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subu sp,sp,HandlerFrameLength // allocate stack frame
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sw ra,HdRa(sp) // save return address
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PROLOGUE_END
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lw t0,ErExceptionFlags(a0) // get exception flags
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and t0,t0,EXCEPTION_UNWIND // check if unwind in progress
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bne zero,t0,10f // if ne, unwind in progress
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li v0,ExceptionContinueSearch // set disposition value
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addu sp,sp,HandlerFrameLength // deallocate stack frame
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j ra // return
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//
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// There is an attempt to unwind through a callback frame. If this were
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// allowed, then a kernel callback frame would be abandoned on the kernel
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// stack. Force a callback return.
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//
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10: lw a2,ErExceptionCode(a0) // get exception code
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move a0,zero // set zero buffer address
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move a1,zero // set zero buffer lenfth
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jal ZwCallbackReturn // return to kernel mode
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//
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// Unsuccessful completion after attempting to return to kernel mode. Use
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// the return status as the exception code, set noncontinuable exception and
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// attempt to raise another exception. Note there is no return from raise
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// status.
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//
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20: move a0,v0 // set status value
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jal RtlRaiseStatus // raise exception
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b 20b // loop on return
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.end KiUserCallbackHandler
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SBTTL("User Exception Dispatcher")
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//++
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//
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// The following code is never executed. Its purpose is to support unwinding
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// through the call to the exception dispatcher.
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//
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//--
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NESTED_ENTRY(KiUserExceptionDispatch, ExceptionDispatcherFrame, zero);
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.set noreorder
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.set noat
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sd sp,CxXIntSp(sp) // save stack pointer
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sd ra,CxXIntRa(sp) // save return address
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sw ra,CxFir(sp) // save return address
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sd s8,CxXIntS8(sp) // save integer register s8
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sd gp,CxXIntGp(sp) // save integer register gp
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sd s0,CxXIntS0(sp) // save integer registers s0 - s7
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sd s1,CxXIntS1(sp) //
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sd s2,CxXIntS2(sp) //
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sd s3,CxXIntS3(sp) //
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sd s4,CxXIntS4(sp) //
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sd s5,CxXIntS5(sp) //
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sd s6,CxXIntS6(sp) //
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sd s7,CxXIntS7(sp) //
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sdc1 f20,CxFltF20(sp) // store floating registers f20 - f31
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sdc1 f22,CxFltF22(sp) //
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sdc1 f24,CxFltF24(sp) //
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sdc1 f26,CxFltF26(sp) //
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sdc1 f28,CxFltF28(sp) //
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sdc1 f30,CxFltF30(sp) //
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move s8,sp // set frame pointer
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.set at
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.set reorder
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PROLOGUE_END
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//++
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//
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// VOID
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// KiUserExceptionDispatcher (
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// IN PEXCEPTION_RECORD ExceptionRecord,
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// IN PCONTEXT ContextRecord
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// )
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//
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// Routine Description:
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//
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// This routine is entered on return from kernel mode to dispatch a user
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// mode exception. If a frame based handler handles the exception, then
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// the execution is continued. Else last chance processing is performed.
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//
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// Arguments:
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//
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// s0 - Supplies a pointer to an exception record.
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//
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// s1 - Supplies a pointer to a context frame.
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//
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// s8 - Supplies the same value as sp and is used as a frame pointer.
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//
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// Return Value:
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//
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// None.
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//
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//--
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ALTERNATE_ENTRY(KiUserExceptionDispatcher)
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move a0,s0 // set address of exception record
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move a1,s1 // set address of context record
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jal RtlDispatchException // attempt to dispatch the exception
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//
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// If the return status is TRUE, then the exception was handled and execution
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// should be continued with the NtContinue service in case the context was
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// changed. If the return status is FALSE, then the exception was not handled
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// and NtRaiseException is called to perform last chance exception processing.
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//
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beq zero,v0,10f // if eq, perform last chance processing
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//
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// Continue execution.
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//
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move a0,s1 // set address of context frame
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li a1,0 // set test alert argument false
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jal ZwContinue // execute system service to continue
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b 20f // join common code
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//
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// Last chance processing.
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//
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10: move a0,s0 // set address of exception record
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move a1,s1 // set address of context frame
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move a2,zero // set first chance FALSE
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jal ZwRaiseException // perform last chance processing
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//
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// Common code for nonsuccessful completion of the continue or last chance
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// service. Use the return status as the exception code, set noncontinuable
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// exception and attempt to raise another exception. Note the stack grows
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// and eventually this loop will end.
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//
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20: move s1,v0 // save status value
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30: subu sp,sp,ExceptionRecordLength + (4 * 4) // allocate exception record
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addu a0,sp,4 * 4 // compute address of actual record
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sw s1,ErExceptionCode(a0) // set exception code
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li t0,EXCEPTION_NONCONTINUABLE // set noncontinuable flag
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sw t0,ErExceptionFlags(a0) //
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sw s0,ErExceptionRecord(a0) // set associated exception record
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sw zero,ErNumberParameters(a0) // set number of parameters
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jal RtlRaiseException // raise exception
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b 20b // loop of error
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.end KiUserExceptionDispatch
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//++
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//
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// NTSTATUS
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// KiRaiseUserExceptionDispatcher (
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// IN NTSTATUS ExceptionCode
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// )
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//
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// Routine Description:
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//
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// This routine is entered on return from kernel mode to raise a user
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// mode exception.
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//
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// N.B. This function is not called in the typical way. Instead of a normal
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// subroutine call to the nested entry point above, the alternate entry point
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// address below is stuffed into the Fir address of the trap frame. Thus when
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// the kernel returns from the trap, the following code is executed directly.
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//
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// Arguments:
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//
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// v0 - Supplies the status code to be raised.
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//
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// Return Value:
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//
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// ExceptionCode
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//
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//--
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.struct 0
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.space 4 * 4 // argument save area
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RaiseRa:.space 4 // saved return address
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RaiseV0:.space 4 // saved S0
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RaiseEr:.space ExceptionRecordLength // exception record for RtlRaiseException
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RaiseFrameLength: // length of handler frame
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NESTED_ENTRY(KiRaiseUserExceptionDispatcher, RaiseFrameLength, zero)
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subu sp,sp,RaiseFrameLength // allocate stack frame
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sw ra,RaiseRa(sp) // save return address
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PROLOGUE_END
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sw v0,RaiseV0(sp) // save function return status
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sw v0,ErExceptionCode + RaiseEr(sp) // set exception code
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sw zero,ErExceptionFlags + RaiseEr(sp) // set exception flags
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sw zero,ErExceptionRecord + RaiseEr(sp) // clear exception record
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sw ra,ErExceptionAddress + RaiseEr(sp) // set exception address
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sw zero,ErNumberParameters+RaiseEr(sp) // set number of parameters
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addu a0,sp,RaiseEr // compute exception record address
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jal RtlRaiseException // attempt to raise the exception
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lw v0,RaiseV0(sp) // restore function status
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lw ra,RaiseRa(sp) // restore return address
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addu sp,sp,RaiseFrameLength // deallocate stack frame
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j ra // return
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.end KiRaiseUserExceptionDispatch
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