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reactos/ntoskrnl/ke/arm/usercall.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: ntoskrnl/ke/arm/usercall.c
* PURPOSE: Implements system calls and user-mode callbacks for ARM
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
//
// System call wrapper generator
//
#define BUILD_SYSCALLS \
SYSCALL(00, ()) \
SYSCALL(01, (_1)) \
SYSCALL(02, (_1, _2)) \
SYSCALL(03, (_1, _2, _3)) \
SYSCALL(04, (_1, _2, _3, _4 )) \
SYSCALL(05, (_1, _2, _3, _4, _5)) \
SYSCALL(06, (_1, _2, _3, _4, _5, _6)) \
SYSCALL(07, (_1, _2, _3, _4, _5, _6, _7)) \
SYSCALL(08, (_1, _2, _3, _4, _5, _6, _7, _8)) \
SYSCALL(09, (_1, _2, _3, _4, _5, _6, _7, _8, _9)) \
SYSCALL(0A, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a)) \
SYSCALL(0B, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b)) \
SYSCALL(0C, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c)) \
SYSCALL(0D, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c, d)) \
SYSCALL(0E, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c, d, e)) \
SYSCALL(0F, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c, d, e, f)) \
SYSCALL(10, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c, d, e, f, _10)) \
SYSCALL(11, (_1, _2, _3, _4, _5, _6, _7, _8, _9, a, b, c, d, e, f, _10, _11))
//
// Generate function pointer definitions
//
#define PROTO
#include "ke_i.h"
BUILD_SYSCALLS
//
// Generate function code
//
#define FUNC
#include "ke_i.h"
BUILD_SYSCALLS
/* SYSTEM CALL STUBS **********************************************************/
typedef NTSTATUS (*PKI_SYSCALL_PARAM_HANDLER)(IN PVOID p, IN PVOID *g);
PKI_SYSCALL_PARAM_HANDLER KiSyscallHandlers[0x12] =
{
KiSyscall00Param,
KiSyscall01Param,
KiSyscall02Param,
KiSyscall03Param,
KiSyscall04Param,
KiSyscall05Param,
KiSyscall06Param,
KiSyscall07Param,
KiSyscall08Param,
KiSyscall09Param,
KiSyscall0AParam,
KiSyscall0BParam,
KiSyscall0CParam,
KiSyscall0DParam,
KiSyscall0EParam,
KiSyscall0FParam,
KiSyscall10Param,
KiSyscall11Param,
};
/* FUNCIONS *******************************************************************/
VOID
KiSystemService(IN PKTHREAD Thread,
IN PKTRAP_FRAME TrapFrame,
IN ULONG Instruction)
{
ULONG Id, Number, ArgumentCount, i;
PKPCR Pcr;
ULONG_PTR ServiceTable, Offset;
PKSERVICE_TABLE_DESCRIPTOR DescriptorTable;
PVOID SystemCall;
PVOID* Argument;
PVOID Arguments[0x11]; // Maximum 17 arguments
KIRQL OldIrql;
ASSERT(TrapFrame->Reserved == 0xBADB0D00);
//
// Increase count of system calls
//
Pcr = KeGetPcr();
Pcr->CurrentPrcb->KeSystemCalls++;
//
// Get the system call ID
//
Id = Instruction & 0xFFFFF;
//DPRINT1("[SWI] (%x) %p (%d) \n", Id, Thread, Thread->PreviousMode);
//
// Get the descriptor table
//
ServiceTable = (ULONG_PTR)Thread->ServiceTable;
Offset = ((Id >> SERVICE_TABLE_SHIFT) & SERVICE_TABLE_MASK);
ServiceTable += Offset;
DescriptorTable = (PVOID)ServiceTable;
//
// Get the service call number and validate it
//
Number = Id & SERVICE_NUMBER_MASK;
if (Number > DescriptorTable->Limit)
{
//
// Check if this is a GUI call
//
UNIMPLEMENTED;
ASSERT(FALSE);
}
//
// Save the function responsible for handling this system call
//
SystemCall = (PVOID)DescriptorTable->Base[Number];
//
// Check if this is a GUI call
//
if (Offset & SERVICE_TABLE_TEST)
{
//
// TODO
//
UNIMPLEMENTED;
ASSERT(FALSE);
}
//
// Check how many arguments this system call takes
//
ArgumentCount = DescriptorTable->Number[Number] / 4;
ASSERT(ArgumentCount <= 17);
//
// Copy the register-arguments first
// First four arguments are in a1, a2, a3, a4
//
Argument = (PVOID*)&TrapFrame->R0;
for (i = 0; (i < ArgumentCount) && (i < 4); i++)
{
//
// Copy them into the kernel stack
//
Arguments[i] = *Argument;
Argument++;
}
//
// If more than four, we'll have some on the user stack
//
if (ArgumentCount > 4)
{
//
// Check where the stack is
//
if (Thread->PreviousMode == UserMode)
{
//
// FIXME-USER: Validate the user stack
//
ASSERT(FALSE);
Argument = (PVOID*)TrapFrame->Sp;
}
else
{
//
// We were called from the kernel
//
Argument = (PVOID*)(TrapFrame + 1);
}
//
// Copy the rest
//
for (i = 4; i < ArgumentCount; i++)
{
//
// Copy into kernel stack
//
Arguments[i] = *Argument;
Argument++;
}
}
//
// We can safely enable interrupts here
//
_enable();
//
// Do the system call and save result in EAX
//
TrapFrame->R0 = KiSyscallHandlers[ArgumentCount]((PVOID)SystemCall,
(PVOID)Arguments);
//
// Check if this was a user call
//
if (KiGetPreviousMode(TrapFrame) == UserMode)
{
//
// Make sure we didn't return at elevated IRQL
//
OldIrql = KeGetCurrentIrql();
if (OldIrql != PASSIVE_LEVEL)
{
//
// Forcibly put us in a sane state
//
KeGetPcr()->CurrentIrql = 0;
_disable();
//
// Fail
//
KeBugCheckEx(IRQL_GT_ZERO_AT_SYSTEM_SERVICE,
(ULONG_PTR)SystemCall,
OldIrql,
0,
0);
}
//
// Make sure we're not attached and that APCs are not disabled
//
if ((KeGetCurrentThread()->ApcStateIndex != CurrentApcEnvironment) ||
(KeGetCurrentThread()->CombinedApcDisable != 0))
{
//
// Fail
//
KeBugCheckEx(APC_INDEX_MISMATCH,
(ULONG_PTR)SystemCall,
KeGetCurrentThread()->ApcStateIndex,
KeGetCurrentThread()->CombinedApcDisable,
0);
}
}
//
// Restore the old trap frame
//
Thread->TrapFrame = KiGetLinkedTrapFrame(TrapFrame);
}
VOID
NTAPI
KiInitializeUserApc(IN PKEXCEPTION_FRAME ExceptionFrame,
IN PKTRAP_FRAME TrapFrame,
IN PKNORMAL_ROUTINE NormalRoutine,
IN PVOID NormalContext,
IN PVOID SystemArgument1,
IN PVOID SystemArgument2)
{
CONTEXT Context = { 0 };
ULONG_PTR Stack;
ULONG ContextLength;
DPRINT1("User APC: %p %p %p\n", NormalContext, SystemArgument1, SystemArgument2);
//
// Build the user mode context
//
Context.ContextFlags = CONTEXT_FULL;
KeTrapFrameToContext(TrapFrame, ExceptionFrame, &Context);
//
// Setup the context on the user stack
//
ContextLength = sizeof(CONTEXT);
Stack = (ULONG_PTR)(Context.Sp & ~7) - ContextLength;
//
// Make sure the stack is valid, and copy the context
//
ProbeForWrite((PVOID)Stack, ContextLength, sizeof(QUAD));
RtlMoveMemory((PVOID)Stack, &Context, sizeof(CONTEXT));
//
// Setup the trap frame when we return to user mode
//
TrapFrame->R0 = (ULONG)NormalContext;
TrapFrame->R1 = (ULONG)SystemArgument1;
TrapFrame->R2 = (ULONG)SystemArgument2;
TrapFrame->R3 = (ULONG)NormalRoutine;
TrapFrame->Sp = Stack;
TrapFrame->Lr = (ULONG)KeUserApcDispatcher;
}
NTSTATUS
NTAPI
KeUserModeCallback(IN ULONG RoutineIndex,
IN PVOID Argument,
IN ULONG ArgumentLength,
OUT PVOID *Result,
OUT PULONG ResultLength)
{
ASSERT(FALSE);
return STATUS_NOT_IMPLEMENTED;
}
NTSTATUS
NTAPI
KiCallUserMode(
IN PVOID *OutputBuffer,
IN PULONG OutputLength)
{
ASSERT(FALSE);
return STATUS_NOT_IMPLEMENTED;
}
NTSTATUS
NTAPI
NtCallbackReturn(
_In_ PVOID Result,
_In_ ULONG ResultLength,
_In_ NTSTATUS CallbackStatus)
{
ASSERT(FALSE);
return STATUS_NOT_IMPLEMENTED;
}
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