173 lines
5.0 KiB
ArmAsm
173 lines
5.0 KiB
ArmAsm
// TITLE("Debug Support Functions")
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// Copyright (c) 1993 IBM Corporation
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// Module Name:
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// debug.s
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// Abstract:
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// This module implements functions to support debugging NT. Each
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// function executes a trap r31,r29,r0 instruction with a special value in
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// R31. The simulator decodes this trap instruction and dispatches to the
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// correct piece of code in the simulator based on the value in R31. See
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// the simscal.c source file in the simulator source directory.
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// Author:
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// Chuck Bauman 12-Aug-1993
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// Environment:
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// Any mode.
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// Revision History:
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// Initial PowerPC port of NT product1 source 12-Aug-1993
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#include "ksppc.h"
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// VOID DbgBreakPoint()
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// Routine Description:
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// This function executes a breakpoint instruction. Useful for entering
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// the debugger under program control. This breakpoint will always go to
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// the kernel debugger if one is installed, otherwise it will go to the debug subsystem.
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// Arguments:
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// None.
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// Return Value:
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// None.
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LEAF_ENTRY(DbgBreakPoint)
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twi 31,0,DEBUG_STOP_BREAKPOINT
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LEAF_EXIT(DbgBreakPoint)
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// VOID DbgBreakPointWithStatus(IN ULONG Status)
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// Routine Description:
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// This function executes a breakpoint instruction. Useful for entering
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// the debugger under program control. This breakpoint will always go to
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// the kernel debugger if one is installed, otherwise it will go to the
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// debug subsystem. This function is identical to DbgBreakPoint, except
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// that it takes an argument which the debugger can see.
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// Arguments:
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// None.
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// Return Value:
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// None.
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LEAF_ENTRY(DbgBreakPointWithStatus)
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ALTERNATE_ENTRY(RtlpBreakWithStatusInstruction)
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twi 31,0,DEBUG_STOP_BREAKPOINT
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LEAF_EXIT(DbgBreakPointWithStatus)
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// VOID DbgUserBreakPoint()
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// Routine Description:
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// This function executes a breakpoint instruction. Useful for entering
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// the debug subsystem under program control. The kernel debug will ignore
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// this breakpoint since it will not find the instruction address in its breakpoint table.
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// Arguments:
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// None.
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// Return Value:
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// None.
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LEAF_ENTRY(DbgUserBreakPoint)
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twi 31,0,DEBUG_STOP_BREAKPOINT
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LEAF_EXIT(DbgUserBreakPoint)
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// ULONG DebugPrompt(IN PSTRING Output, IN PSTRING Input)
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// Routine Description:
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// This function executes a debug prompt breakpoint.
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// Arguments:
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// Output (r.3) - Supplies a pointer to the output string descriptor.
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// Input (r.4) - Supplies a pointer to the input string descriptor.
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// Return Value:
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// The length of the input string is returned as the function value.
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#if DEVL
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LEAF_ENTRY(DebugPrompt)
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lhz r.6,StrMaximumLength(r.4) // set maximum length of input string
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lwz r.5,StrBuffer(r.4) // set address of input string
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lhz r.4,StrLength(r.3) // set length of output string
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lwz r.3,StrBuffer(r.3) // set address of output string
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twi 31,0,DEBUG_PROMPT_BREAKPOINT // execute a debug prompt breakpoint
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LEAF_EXIT(DebugPrompt)
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#endif
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// VOID DebugLoadImageSymbols(IN PSTRING ImagePathName, IN PKD_SYMBOLS_INFO SymbolInfo)
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// Routine Description:
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// This function calls the kernel debugger to load the symbol
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// table for the specified image.
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// Arguments:
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// ImagePathName - specifies the fully qualified path name of the image
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// file that has been loaded into an NT address space.
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// SymbolInfo - information captured from header of image file.
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// Return Value:
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// None.
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#if DEVL
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LEAF_ENTRY(DebugLoadImageSymbols)
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twi 31,0,DEBUG_LOAD_SYMBOLS_BREAKPOINT
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LEAF_EXIT(DebugLoadImageSymbols)
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#endif
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// VOID DebugUnLoadImageSymbols(IN PSTRING ImagePathName, IN PKD_SYMBOLS_INFO SymbolInfo)
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// Routine Description:
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// This function calls the kernel debugger to unload the symbol table for the specified image.
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// Arguments:
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// ImagePathName - specifies the fully qualified path name of the image file that has been unloaded from an NT address space.
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// SymbolInfo - information captured from header of image file.
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// Return Value:
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// None.
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#if DEVL
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LEAF_ENTRY(DebugUnLoadImageSymbols)
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twi 31,0,DEBUG_UNLOAD_SYMBOLS_BREAKPOINT
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LEAF_EXIT(DebugUnLoadImageSymbols)
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#endif
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// NTSTATUS DebugPrint(IN PSTRING Output)
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// Routine Description:
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// This function executes a debug print breakpoint.
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// Arguments:
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// Output (r.3) - Supplies a pointer to the output string descriptor.
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// Return Value:
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// Status code. STATUS_SUCCESS if debug print happened.
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// STATUS_BREAKPOINT if user typed a Control-C during print.
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// STATUS_DEVICE_NOT_CONNECTED if kernel debugger not present.
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#if DEVL
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LEAF_ENTRY(DebugPrint)
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lhz r.4,StrLength(r.3) // set length of output string
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lwz r.3,StrBuffer(r.3) // set address of output string
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twi 31,0,DEBUG_PRINT_BREAKPOINT // execute a debug print breakpoint
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LEAF_EXIT(DebugPrint)
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#endif
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