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330 lines
8.1 KiB
330 lines
8.1 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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context.c
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Abstract:
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This module implements user-mode callable context manipulation routines.
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Author:
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Mark Lucovsky (markl) 20-Jun-1989
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Revision History:
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David N. Cutler (davec) 18-Apr-1990
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Revise for MIPS environment.
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Thomas Van Baak (tvb) 11-May-1992
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Adapted for Alpha AXP.
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--*/
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#include <nt.h>
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#include <ntrtl.h>
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#include <alphaops.h>
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VOID
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RtlInitializeContext(
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IN HANDLE Process,
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OUT PCONTEXT Context,
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IN PVOID Parameter OPTIONAL,
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IN PVOID InitialPc OPTIONAL,
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IN PVOID InitialSp OPTIONAL
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)
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/*++
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Routine Description:
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This function initializes a context structure so that it can be used in
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a subsequent call to NtCreateThread.
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Arguments:
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Process - Supplies an open handle to the target process. This argument
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is ignored by this function.
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Context - Supplies a pointer to a context record that is to be initialized.
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Parameter - Supplies an initial value for register A0.
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InitialPc - Supplies an initial program counter value.
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InitialSp - Supplies an initial stack pointer value.
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Return Value:
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Raises STATUS_BAD_INITIAL_STACK if the value of InitialSp is not properly
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aligned.
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Raises STATUS_BAD_INITIAL_PC if the value of InitialPc is not properly
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aligned.
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--*/
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{
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//
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// Check for proper initial stack and PC alignment.
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//
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if (((ULONG)InitialSp & 0xF) != 0) {
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RtlRaiseStatus(STATUS_BAD_INITIAL_STACK);
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}
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if (((ULONG)InitialPc & 0x3) != 0) {
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RtlRaiseStatus(STATUS_BAD_INITIAL_PC);
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}
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//
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// Initialize the integer registers to contain their register number
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// (they must be initialized and using register numbers instead of 0
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// can be useful for debugging). Integer registers a0, ra, gp, and sp
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// are set later.
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//
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Context->IntV0 = 0;
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Context->IntT0 = 1;
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Context->IntT1 = 2;
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Context->IntT2 = 3;
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Context->IntT3 = 4;
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Context->IntT4 = 5;
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Context->IntT5 = 6;
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Context->IntT6 = 7;
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Context->IntT7 = 8;
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Context->IntS0 = 9;
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Context->IntS1 = 10;
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Context->IntS2 = 11;
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Context->IntS3 = 12;
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Context->IntS4 = 13;
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Context->IntS5 = 14;
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Context->IntFp = 15;
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Context->IntA1 = 17;
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Context->IntA2 = 18;
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Context->IntA3 = 19;
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Context->IntA4 = 20;
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Context->IntA5 = 21;
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Context->IntT8 = 22;
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Context->IntT9 = 23;
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Context->IntT10 = 24;
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Context->IntT11 = 25;
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Context->IntT12 = 27;
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Context->IntAt = 28;
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//
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// Initialize the floating point registers to contain the integer value
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// of their register number (they must be initialized and using register
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// numbers instead of 0 can be useful for debugging).
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//
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Context->FltF0 = 0;
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Context->FltF1 = 1;
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Context->FltF2 = 2;
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Context->FltF3 = 3;
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Context->FltF4 = 4;
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Context->FltF5 = 5;
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Context->FltF6 = 6;
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Context->FltF7 = 7;
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Context->FltF8 = 8;
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Context->FltF9 = 9;
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Context->FltF10 = 10;
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Context->FltF11 = 11;
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Context->FltF12 = 12;
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Context->FltF13 = 13;
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Context->FltF14 = 14;
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Context->FltF15 = 15;
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Context->FltF16 = 16;
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Context->FltF17 = 17;
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Context->FltF18 = 18;
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Context->FltF19 = 19;
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Context->FltF20 = 20;
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Context->FltF21 = 21;
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Context->FltF22 = 22;
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Context->FltF23 = 23;
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Context->FltF24 = 24;
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Context->FltF25 = 25;
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Context->FltF26 = 26;
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Context->FltF27 = 27;
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Context->FltF28 = 28;
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Context->FltF29 = 29;
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Context->FltF30 = 30;
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Context->FltF31 = 0;
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//
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// Initialize the control registers.
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//
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// Gp: will be set in LdrpInitialize at thread startup.
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// Ra: some debuggers compare for 1 as a top-of-stack indication.
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//
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// N.B. ULONG becomes canonical longword with (ULONGLONG)(LONG) cast.
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//
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Context->IntGp = 0;
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Context->IntSp = (ULONGLONG)(LONG)InitialSp;
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Context->IntRa = 1;
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Context->Fir = (ULONGLONG)(LONG)InitialPc;
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//
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// Set default Alpha floating point control register values.
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//
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Context->Fpcr = (ULONGLONG)0;
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((PFPCR)(&Context->Fpcr))->DynamicRoundingMode = ROUND_TO_NEAREST;
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Context->SoftFpcr = (ULONGLONG)0;
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Context->Psr = 0;
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Context->ContextFlags = CONTEXT_FULL;
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//
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// Set the initial context of the thread in a machine specific way.
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//
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Context->IntA0 = (ULONGLONG)(LONG)Parameter;
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}
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NTSTATUS
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RtlRemoteCall(
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HANDLE Process,
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HANDLE Thread,
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PVOID CallSite,
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ULONG ArgumentCount,
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PULONG Arguments,
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BOOLEAN PassContext,
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BOOLEAN AlreadySuspended
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)
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/*++
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Routine Description:
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This function calls a procedure in another thread/process by using
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NtGetContext and NtSetContext. Parameters are passed to the target
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procedure via the nonvolatile registers (s0 - s5).
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Arguments:
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Process - Supplies an open handle to the target process.
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Thread - Supplies an open handle to the target thread within the target
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process.
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CallSite - Supplies the address of the procedure to call in the target
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process.
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ArgumentCount - Supplies the number of 32 bit parameters to pass to the
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target procedure.
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Arguments - Supplies a pointer to the array of 32 bit parameters to pass.
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PassContext - Supplies a boolean value that determines whether a parameter
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is to be passed that points to a context record. This parameter is
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ignored on MIPS and Alpha hosts.
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AlreadySuspended - Supplies a boolean value that determines whether the
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target thread is already in a suspended or waiting state.
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Return Value:
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Status - Status value.
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--*/
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{
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NTSTATUS Status;
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CONTEXT Context;
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ULONG Index;
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ULONGLONG NewSp;
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if ((ArgumentCount > 6) ||
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(PassContext && (ArgumentCount > 5))) {
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return(STATUS_INVALID_PARAMETER);
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}
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//
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// If necessary, suspend the target thread before getting the thread's
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// current state.
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//
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if (AlreadySuspended == FALSE) {
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Status = NtSuspendThread(Thread, NULL);
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if (NT_SUCCESS(Status) == FALSE) {
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return(Status);
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}
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}
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//
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// Get the current state of the target thread.
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//
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Context.ContextFlags = CONTEXT_FULL;
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Status = NtGetContextThread(Thread, &Context);
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if (NT_SUCCESS(Status) == FALSE) {
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if (AlreadySuspended == FALSE) {
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NtResumeThread(Thread, NULL);
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}
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return(Status);
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}
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if (AlreadySuspended) {
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Context.IntV0 = STATUS_ALERTED;
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}
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//
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// Pass the parameters to the other thread via the non-volatile registers
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// s0 - s5. The context record is passed on the stack of the target thread.
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//
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NewSp = Context.IntSp - sizeof(CONTEXT);
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Status = NtWriteVirtualMemory(Process, (PVOID)NewSp, &Context,
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sizeof(CONTEXT), NULL);
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if (NT_SUCCESS(Status) == FALSE) {
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if (AlreadySuspended == FALSE) {
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NtResumeThread(Thread, NULL);
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}
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return(Status);
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}
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//
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// N.B. Each ULONG argument is converted to canonical form with the
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// (ULONGLONG)(LONG) cast as required by the calling standard.
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//
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// N.B. Given the PULONG Arguments prototype, this function cannot pass
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// quadword arguments (including structures such as LARGE_INTEGER).
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//
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Context.IntSp = NewSp;
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if (PassContext) {
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Context.IntS0 = NewSp;
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for (Index = 0; Index < ArgumentCount; Index += 1) {
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(&Context.IntS1)[Index] = (ULONGLONG)(LONG)Arguments[Index];
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}
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} else {
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for (Index = 0; Index < ArgumentCount; Index += 1) {
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(&Context.IntS0)[Index] = (ULONGLONG)(LONG)Arguments[Index];
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}
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}
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//
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// Set the address of the target code into FIR and set the thread context
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// to cause the target procedure to be executed.
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//
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// N.B. The PVOID CallSite is stored as a canonical longword in order
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// for Fir to be a valid 64-bit address.
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//
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Context.Fir = (ULONGLONG)(LONG)CallSite;
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Status = NtSetContextThread(Thread, &Context);
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if (AlreadySuspended == FALSE) {
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NtResumeThread(Thread, NULL);
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}
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return(Status);
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}
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