nkarm.h

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/*++ BUILD Version: 0016    Increment this if a change has global effects

Copyright (c) 1990-2000 Microsoft Corporation.  All rights reserved.

Module Name:

    nkarm.h

Abstract:

    User-mode visible ARM specific structures and constants

--*/

#ifndef _NKARM_
#define _NKARM_

// begin_ntddk begin_nthal

#if defined(ARM)

#define _cdecl

// begin_windbgkd

//
// Define ARM specific kernel debugger information.
//
// The following structure contains machine specific data passed to
// the host system kernel debugger in a wait state change message.
//

#define DBGKD_MAXSTREAM 16

typedef struct _DBGKD_CONTROL_REPORT {
    ULONG InstructionCount;
    UCHAR InstructionStream[DBGKD_MAXSTREAM];
} DBGKD_CONTROL_REPORT, *PDBGKD_CONTROL_REPORT;

//
// The following structure contains information that the host system
// kernel debugger wants to set on every continue operation and avoids
// the need to send extra packets of information.
//

typedef ULONG DBGKD_CONTROL_SET, *PDBGKD_CONTROL_SET;

// end_windbgkd


//
// Define breakpoint codes.
//

#define USER_BREAKPOINT 0                   // user breakpoint
#define KERNEL_BREAKPOINT 1                 // kernel breakpoint
#define BREAKIN_BREAKPOINT 2                // break into kernel debugger
#define BRANCH_TAKEN_BREAKPOINT 3           // branch taken breakpoint
#define BRANCH_NOT_TAKEN_BREAKPOINT 4       // branch not taken breakpoint
#define SINGLE_STEP_BREAKPOINT 5            // single step breakpoint
#define DIVIDE_OVERFLOW_BREAKPOINT 6        // divide overflow breakpoint
#define DIVIDE_BY_ZERO_BREAKPOINT 7         // divide by zero breakpoint
#define RANGE_CHECK_BREAKPOINT 8            // range check breakpoint
#define STACK_OVERFLOW_BREAKPOINT 9         // MIPS code
#define MULTIPLY_OVERFLOW_BREAKPOINT 10     // multiply overflow breakpoint

#define DEBUG_PRINT_BREAKPOINT 20           // debug print breakpoint
#define DEBUG_PROMPT_BREAKPOINT 21          // debug prompt breakpoint
//#define DEBUG_STOP_BREAKPOINT 22            // debug stop breakpoint
//#define DEBUG_LOAD_SYMBOLS_BREAKPOINT 23    // load symbols breakpoint
#define DEBUG_UNLOAD_SYMBOLS_BREAKPOINT 24  // unload symbols breakpoint

typedef struct _CPUCONTEXT {
	ULONG Psr;
	ULONG R0;
	ULONG R1;
	ULONG R2;
	ULONG R3;
	ULONG R4;
	ULONG R5;
	ULONG R6;
	ULONG R7;
	ULONG R8;
	ULONG R9;
	ULONG R10;
	ULONG R11;
	ULONG R12;
	ULONG Sp;
	ULONG Lr;
	ULONG Pc;
} CPUCONTEXT, *PCPUCONTEXT;


#define CONTEXT_TO_PROGRAM_COUNTER(Context) ((Context)->Pc)

#define CONTEXT_LENGTH (sizeof(CPUCONTEXT))
#define CONTEXT_ALIGN (sizeof(ULONG))
#define CONTEXT_ROUND (CONTEXT_ALIGN - 1)

// ARM processor modes
#define USER_MODE	0x10	// 0b10000
#define FIQ_MODE	0x11	// 0b10001
#define IRQ_MODE	0x12	// 0b10010
#define SVC_MODE	0x13	// 0b10011
#define ABORT_MODE	0x17	// 0b10111
#define UNDEF_MODE	0x1b	// 0b11011
#define SYSTEM_MODE 0x1f	// 0b11111

// Other state bits in the processor status register
#define THUMB_STATE 0x20
#define FIQ_DISABLE 0x40
#define IRQ_DISABLE 0x80


/* Query & set thread's kernel vs. user mode state */
#define KERNEL_MODE     SYSTEM_MODE
#define SR_MODE_MASK	0x1f
#define GetThreadMode(pth) ((pth)->ctx.Psr & SR_MODE_MASK)
#define SetThreadMode(pth, mode) \
        ((pth)->ctx.Psr = ((pth)->ctx.Psr&~SR_MODE_MASK) | (mode))

/* Query & set kernel vs. user mode state via Context */
#define GetContextMode(pctx) ((pctx)->Psr & SR_MODE_MASK)
#define SetContextMode(pctx, mode)	\
		((pctx)->Psr = ((pctx)->Psr&~SR_MODE_MASK) | (mode))

#define SWITCHKEY(oldval, newval) ((oldval) = (pCurThread)->aky, (pCurThread)->aky = (newval))
#define GETCURKEY() ((pCurThread)->aky)
#define SETCURKEY(newval) ((pCurThread)->aky = (newval))


// begin_nthal
//
// Define address space layout as defined by ARM memory management.
//

#define KUSEG_BASE 0x0                  // base of user segment
#define KSEG0_BASE 0x80000000           // base of cached kernel physical
#define KSEG1_BASE 0xa0000000           // base of uncached kernel physical
#define KSEG2_BASE 0xc0000000           // base of cached kernel virtual
// end_nthal


//
// Define ARM exception handling structures and function prototypes.
//
// Function table entry structure definition.
//

typedef struct _RUNTIME_FUNCTION {
    ULONG BeginAddress;
    ULONG EndAddress;
    PEXCEPTION_ROUTINE ExceptionHandler;
    PVOID HandlerData;
    ULONG PrologEndAddress;
} RUNTIME_FUNCTION, *PRUNTIME_FUNCTION;

//
// Scope table structure definition.
//

typedef struct _SCOPE_TABLE {
    ULONG Count;
    struct
    {
        ULONG BeginAddress;
        ULONG EndAddress;
        ULONG HandlerAddress;
        ULONG JumpTarget;
    } ScopeRecord[1];
} SCOPE_TABLE, *PSCOPE_TABLE;

//
// Runtime Library function prototypes.
//

VOID
RtlCaptureContext (
    OUT PCONTEXT ContextRecord
    );

ULONG
RtlVirtualUnwind (
    IN ULONG ControlPc,
    IN PRUNTIME_FUNCTION FunctionEntry,
    IN OUT PCONTEXT ContextRecord,
    OUT PBOOLEAN InFunction,
    OUT PULONG EstablisherFrame
    );

//
// Define C structured exception handing function prototypes.
//

struct _EXCEPTION_POINTERS;

typedef
LONG
(*EXCEPTION_FILTER) (
    ULONG EstablisherFrame,
    struct _EXCEPTION_POINTERS *ExceptionPointers
    );

typedef
VOID
(*TERMINATION_HANDLER) (
    ULONG EstablisherFrame,
    BOOLEAN is_abnormal
    );


// begin_ntddk begin_nthal

#define retValue ctx.R0
#define ARG0    ctx.R0
#define SetThreadIP(pth, addr) ((pth)->ctx.Pc = (ULONG)(addr))
#define GetThreadIP(pth) ((pth)->ctx.Pc)

/* Macros for handling stack shrinkage. */
#define MDTestStack(pth)    (((pth)->ctx.Sp < 0x80000000          \
        && ((pth)->dwStackBound>>VA_PAGE) < (((pth)->ctx.Sp-32)>>VA_PAGE))  \
        ? (pth)->dwStackBound : 0)

#define MDShrinkStack(pth)  ((pth)->dwStackBound += PAGE_SIZE)


// Trap id values shared between C & ASM code.
#define ID_RESCHEDULE		0	// NOP used to force a reschedule
#define ID_UNDEF_INSTR		1	// undefined instruction
#define ID_SWI_INSTR		2	// SWI instruction
#define ID_PREFETCH_ABORT	3	// code page fault
#define ID_DATA_ABORT		4	// data page fault or bus error
#define ID_IRQ				5	// external h/w interrupt

// The following codes are used internally by the kernel.
#define ID_STACK_FAULT	8
#define ID_HW_BREAK		9

#include "mem_arm.h"










struct KDataStruct {
	LPDWORD	lpvTls;			/* 0x000 Current thread local storage pointer */
    HANDLE 	ahSys[NUM_SYS_HANDLES]; /* 0x004 If this moves, change kapi.h */
    char    bResched;       /* 0x084 reschedule flag */
    char    cNest;          /* 0x085 kernel exception nesting */
    char    bPowerOff;      /* 0x086 TRUE during "power off" processing */
    char    bProfileOn;     /* 0x087 TRUE if profiling enabled */
    ulong   ptDesc;         /* 0x088 Page Table Descriptor */
    ulong   rsvd2;          /* 0x08c was DiffMSec */
	PPROCESS pCurPrc;		/* 0x090 ptr to current PROCESS struct */
	PTHREAD	pCurThd;		/* 0x094 ptr to current THREAD struct */
	DWORD	dwKCRes;	    /* 0x098  */
	ulong	handleBase;		/* 0x09c handle table base address */
	PSECTION aSections[64]; /* 0x0a0 section table for virutal memory */
	LPEVENT alpeIntrEvents[SYSINTR_MAX_DEVICES];/* 0x1a0 */
	LPVOID  alpvIntrData[SYSINTR_MAX_DEVICES];  /* 0x220 */
	ulong	pAPIReturn;		/* 0x2a0 direct API return address for kernel mode */
	uchar	*pMap;			/* 0x2a4 ptr to MemoryMap array */
	DWORD	dwInDebugger;	/* 0x2a8 !0 when in debugger */

	long    alPad[21];      /* 0x2ac - padding */
	DWORD   aInfo[32];      /* 0x300 - misc. kernel info */
	                        /* 0x380 - interlocked api code */
	                        /* 0x400 - end */
};  /* KDataStruct */

/* High memory layout
 *
 * This structure is mapped in at the end of the 4GB virtual
 * address space.
 *
 *  0xFFFD0000 - first level page table (uncached) (2nd half is r/o)
 *  0xFFFD4000 - disabled for protection
 *  0xFFFE0000 - second level page tables (uncached)
 *  0xFFFE4000 - disabled for protection
 *  0xFFFF0000 - exception vectors
 *  0xFFFF0400 - not used (r/o)
 *  0xFFFF1000 - disabled for protection
 *  0xFFFF2000 - r/o (physical overlaps with vectors)
 *  0xFFFF2400 - Interrupt stack (1k)
 *  0xFFFF2800 - r/o (physical overlaps with Abort stack & FIQ stack)
 *  0xFFFF3000 - disabled for protection
 *  0xFFFF4000 - r/o (physical memory overlaps with vectors & intr. stack & FIQ stack)
 *  0xFFFF4900 - Abort stack (2k - 256 bytes)
 *  0xFFFF5000 - disabled for protection
 *  0xFFFF6000 - r/o (physical memory overlaps with vectors & intr. stack)
 *  0xFFFF6800 - FIQ stack (256 bytes)
 *  0xFFFF6900 - r/o (physical memory overlaps with Abort stack)
 *  0xFFFF7000 - disabled
 *  0xFFFFC000 - kernel stack
 *  0xFFFFC800 - KDataStruct
 *  0xFFFFCC00 - disabled for protection (2nd level page table for 0xFFF00000)
 */

typedef struct _PAGETBL {
	ulong	PTEs[256];
} PAGETBL;

typedef struct ARM_HIGH {
	ulong	firstPT[4096];		// 0xFFFD0000: 1st level page table
	PAGETBL	aPT[16];			// 0xFFFD4000: 2nd level page tables
	char	reserved2[0x20000-0x4000-16*sizeof(PAGETBL)];

	char	exVectors[0x400];	// 0xFFFF0000: exception vectors
	char	reserved3[0x2400-0x400];

	char	intrStack[0x400];	// 0xFFFF2400: interrupt stack
	char	reserved4[0x4900-0x2800];

	char	abortStack[0x700];	// 0xFFFF4900: abort stack
	char	reserved5[0x6800-0x5000];

	char	fiqStack[0x100];	// 0xFFFF6800: FIQ stack
	char	reserved6[0xC000-0x6900];

	char	kStack[0x800];		// 0xFFFFC000: kernel stack
	struct KDataStruct kdata;	// 0xFFFFC800: kernel data page
} ARM_HIGH;

#define ArmHigh	((ARM_HIGH *)0xFFFD0000)
#define FirstPT (ArmHigh->firstPT)
#define PageTables (ArmHigh->aPT)
#define KData	(ArmHigh->kdata)
#define VKData	(*(volatile struct KDataStruct *)&KData)
ERRFALSE((ulong)PUserKData==(ulong)&KData);

#define hCurThread  (KData.ahSys[SH_CURTHREAD])
#define hCurProc    (KData.ahSys[SH_CURPROC])
#define pCurThread	(KData.pCurThd)
#define pCurProc	(KData.pCurPrc)
#define ReschedFlag (KData.bResched)
#define PowerOffFlag (KData.bPowerOff)
#define ProfileFlag (KData.bProfileOn)
#define CurAKey     (pCurThread->aky)
#define SectionTable (KData.aSections)
#define MustReschedule()	(*(ushort*)&KData.bResched == 1)
#define IntrEvents  (KData.alpeIntrEvents)
#define IntrData    (KData.alpvIntrData)
#define KPlpvTls	(KData.lpvTls)
#define KInfoTable  (KData.aInfo)
#define DIRECT_RETURN (KData.pAPIReturn)
#define MemoryMap	(KData.pMap)
#define	InDebugger	(KData.dwInDebugger)
#define PageTableDescriptor	(KData.ptDesc)
#define KCResched	(KData.dwKCRes)
extern DWORD CurMSec;
extern DWORD DiffMSec;

extern int InSysCall(void);
extern void INTERRUPTS_ON(void);
extern void INTERRUPTS_OFF(void);

#ifdef InterlockedCompareExchange
#undef InterlockedCompareExchange
#endif

#define InterlockedExchange \
        ((LONG (*)(LPLONG Target, LONG Value))(PUserKData+0x3D4))
#define InterlockedExchangeAdd \
		((long (*)(long *target, long increment))(PUserKData+0x3C0))
#define InterlockedCompareExchange \
		((void *(*)(void **target, void *newValue, void *comparand))\
		(PUserKData+0x3AC))
#define InterlockedPushList \
		((void *(*)(void *pHead, void *pItem))(PUserKData+0x398))
#define InterlockedPopList \
		((void *(*)(void *pHead))(PUserKData+0x380))

#define InterlockedDecrement(target) (InterlockedExchangeAdd(target, -1L)-1)
#define InterlockedIncrement(target) (InterlockedExchangeAdd(target, 1L)+1)
#define InterlockedTestExchange(Target, oldValue, newValue) \
		((long)InterlockedCompareExchange((void**)(Target), \
		(void*)(newValue), (void*)(oldValue)))


#define FIRST_INTERLOCK 0x380


// Defines for CPU specific IDs.
#define THISCPUID IMAGE_FILE_MACHINE_ARM
#define PROCESSOR_ARCHITECTURE PROCESSOR_ARCHITECTURE_ARM
extern DWORD CEProcessorType;
extern WORD ProcessorLevel;
extern WORD ProcessorRevision;

// Cache handling functions
void FlushDCache(void);      // purge dirty data
void FlushICache(void);      // clear out instruction cache

#endif // defined(ARM)
// end_ntddk end_nthal

#endif // _NKARM_