https://github.com/virtualagc/virtualagc
Tip revision: b439c322ff76c75b77699dfabd551e84d90710dc authored by ohommes on 16 June 2008, 03:37:10 UTC
Release 20080615
Release 20080615
Tip revision: b439c32
Backtrace.c
/*
Copyright 2004-2005 Ronald S. Burkey <info@sandroid.org>
This file is part of yaAGC.
yaAGC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
yaAGC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with yaAGC; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
In addition, as a special exception, Ronald S. Burkey gives permission to
link the code of this program with the Orbiter SDK library (or with
modified versions of the Orbiter SDK library that use the same license as
the Orbiter SDK library), and distribute linked combinations including
the two. You must obey the GNU General Public License in all respects for
all of the code used other than the Orbiter SDK library. If you modify
this file, you may extend this exception to your version of the file,
but you are not obligated to do so. If you do not wish to do so, delete
this exception statement from your version.
Filename: Backtrace.c
Purpose: Stuff for yaAGC backtrace.
Contact: Ron Burkey <info@sandroid.org>
Reference: http://www.ibiblio.org/apollo/index.html
Mods: 05/12/04 RSB. Began.
05/14/04 RSB. Added interrupt-request stuff.
Fixed how superbanks are displayed.
05/15/04 RSB Unroll the backtrace table when a RESUME
is encountered to get rid of all the
entries for the ISR.
05/30/04 RSB Added a header file or two.
05/31/04 RSB Corrected for pre-incrementing of Z register
during instructions.
07/12/04 RSB Q is now 16 bits.
08/01/04 RSB Backtraces, as originally intended, are no
longer created unless yaAGC was started in
--debug mode.
08/12/04 RSB Added OutputChannel10[].
02/27/05 RSB Added the license exception, as required by
the GPL, for linking to Orbiter SDK libraries.
05/14/05 RSB Corrected website references.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "agc_engine.h"
#ifdef GDBMI
static agc_t *PendingState;
static int PendingCause;
extern char* SourcePathName;
/* Remove Last Added Backtracepoint should be used for TC Q or RETURN */
void BacktraceRemove()
{
if (BacktraceCount > 0)
{
BacktraceNextAdd--;
if (BacktraceNextAdd < 0)
BacktraceNextAdd = MAX_BACKTRACE_POINTS - 1;
BacktraceCount--;
}
return;
}
int BacktraceDuplicateCheck(agc_t *State, BacktracePoint_t* Prev)
{
int isDuplicate = 0;
int PrevZ = Prev->Erasable[0][RegZ] & 07777;
int PrevFB = 037 & (Prev->Erasable[0][RegBB] >> 10);
int PrevSBB = (Prev->OutputChannel7 & 0100) ? 1 : 0;
int CurrZ = State->Erasable[0][RegZ] & 07777;
int CurrFB = 037 & (State->Erasable[0][RegBB] >> 10);
int CurrSBB = (State->OutputChannel7 & 0100) ? 1 : 0;
if (PrevZ == --CurrZ &&
PrevFB == CurrFB &&
PrevSBB == CurrSBB) isDuplicate = 1;
return isDuplicate;
}
#endif
// This function adds a new backtrace point to the circular buffer. The
// oldest entries are transparently overwritten. The Cause parameter is
// used as follows:
// 0 The backtrace point is in normal code.
// 1-10 The backtrace point is an interrupt vector.
// 255 The backtrace point is a RESUME after interrupt.
// When Cause==255 is encountered, all backtrace points back to (and including)
// the vector to the interrupt are removed. The reason for this is that
// otherwise the array will quickly become completely full of interrupt
// code, and all backtrace points to foreground code will be completely lost.
void
BacktraceAdd (agc_t *State, int Cause)
{
BacktracePoint_t *Bp;
if (SingleStepCounter == -2)
return;
if (BacktraceInitialized == -1)
return;
if (BacktraceInitialized == 0)
{
BacktracePoints = (BacktracePoint_t *)
malloc (MAX_BACKTRACE_POINTS * sizeof (BacktracePoint_t));
if (BacktracePoints == NULL)
{
BacktraceInitialized = -1;
return;
}
BacktraceInitialized = 1;
}
#ifdef GDBMI
/* Check for Duplicate Consecutive Adds remove simple looping */
if (BacktraceNextAdd > 0 &&
BacktraceDuplicateCheck(State,&BacktracePoints[BacktraceNextAdd-1]))
{
return;
}
if (BacktraceNextAdd == 0 &&
BacktraceDuplicateCheck(State,&BacktracePoints[MAX_BACKTRACE_POINTS-1]))
{
return;
}
#endif
if (Cause == 255)
{
while (BacktraceCount > 0)
{
BacktraceNextAdd--;
if (BacktraceNextAdd < 0)
BacktraceNextAdd = MAX_BACKTRACE_POINTS - 1;
BacktraceCount--;
if (BacktracePoints[BacktraceNextAdd].DueToInterrupt)
break;
}
return;
}
Bp = &BacktracePoints[BacktraceNextAdd++];
if (BacktraceNextAdd >= MAX_BACKTRACE_POINTS)
BacktraceNextAdd = 0;
if (BacktraceCount < MAX_BACKTRACE_POINTS)
BacktraceCount++;
// I just happen to know that State->CycleCounter has been pre-incremented.
Bp->CycleCounter = State->CycleCounter - 1;
memcpy (Bp->Erasable, State->Erasable, sizeof (State->Erasable));
memcpy (Bp->InputChannel, State->InputChannel, sizeof (State->InputChannel));
memcpy (Bp->InterruptRequests, State->InterruptRequests,
sizeof (State->InterruptRequests));
Bp->OutputChannel7 = State->OutputChannel7;
memcpy (Bp->OutputChannel10, State->OutputChannel10, sizeof (State->OutputChannel10));
Bp->IndexValue = State->IndexValue;
Bp->ExtraCode = State->ExtraCode;
Bp->AllowInterrupt = State->AllowInterrupt;
//Bp->RegA16 = State->RegA16;
//Bp->RegQ16 = State->RegQ16;
Bp->InIsr = State->InIsr;
Bp->SubstituteInstruction = State->SubstituteInstruction;
Bp->DueToInterrupt = Cause;
Bp->Erasable[0][RegZ]--; // Recall that Z is pre-incremented.
}
// Restores the state of the system from an entry in the backtrace buffer.
// Returns 0 on success or non-zero on error.
int
BacktraceRestore (agc_t *State, int n)
{
BacktracePoint_t *Bp;
int k;
if (SingleStepCounter == -2)
return (1);
if (BacktraceInitialized == -1)
return (2);
if (n < 0)
return (3);
if (n >= BacktraceCount)
return (4);
k = BacktraceNextAdd - n - 1;
if (k < 0)
k += BacktraceCount;
Bp = &BacktracePoints[k];
State->CycleCounter = Bp->CycleCounter;
memcpy (State->Erasable, Bp->Erasable, sizeof (State->Erasable));
memcpy (State->InputChannel, Bp->InputChannel, sizeof (State->InputChannel));
memcpy (State->InterruptRequests, Bp->InterruptRequests,
sizeof (State->InterruptRequests));
State->OutputChannel7 = Bp->OutputChannel7;
memcpy (State->OutputChannel10, Bp->OutputChannel10, sizeof (State->OutputChannel10));
State->IndexValue = Bp->IndexValue;
State->ExtraCode = Bp->ExtraCode;
State->AllowInterrupt = Bp->AllowInterrupt;
//State->RegA16 = Bp->RegA16;
//State->RegQ16 = Bp->RegQ16;
State->InIsr = Bp->InIsr;
State->SubstituteInstruction = Bp->SubstituteInstruction;
return (0);
}
// Displays the backtrace buffer.
void
BacktraceDisplay (agc_t *State)
{
int i, j, k, CurrentZ, Value, Bank;
BacktracePoint_t *Bp;
if (BacktraceInitialized == -1)
{
printf ("Not enough memory for backtrace buffer.\n");
return;
}
#ifdef GDBMI
/* Always show the current location in the trace */
{
char funcname[10];
SymbolLine_t *Line = NULL;
int CurrentZ = State->Erasable[0][RegZ] & 07777;
int FB = 037 & (State->Erasable[0][RegBB] >> 10);
int SBB = (State->OutputChannel7 & 0100) ? 1 : 0;
Line = ResolveLineAGC(CurrentZ, FB, SBB);
if (Line)
{
#ifdef WIN32
printf("#0\t0x%04x in %s () at %s\\%s:%d\n",
gdbmiLinearAddr(&Line->CodeAddress),
gdbmiConstructFuncName(&Line->CodeAddress,funcname),SourcePathName,
Line->FileName,Line->LineNumber);
#else
printf("#0\t0x%04x in %s () at %s/%s:%d\n",
gdbmiLinearAddr(&Line->CodeAddress),
gdbmiConstructFuncName(&Line->CodeAddress,funcname),SourcePathName,
Line->FileName,Line->LineNumber);
#endif
}
}
#endif
if (BacktraceCount == 0)
{
#ifndef GDBMI
printf ("The backtrace table is empty.\n");
#endif
return;
}
for (i = j = 0; i < BacktraceCount; i++)
{
k = BacktraceNextAdd - i - 1;
if (k < 0)
k += BacktraceCount;
Bp = &BacktracePoints[k];
#ifndef GDBMI
printf ("%2d: ", i);
CurrentZ = Bp->Erasable[0][RegZ] & 07777;
// Print the address.
if (CurrentZ < 01400)
{
printf ("Era%04o", CurrentZ);
Bank = CurrentZ / 0400;
Value = Bp->Erasable[Bank][CurrentZ & 0377];
}
else if (CurrentZ >= 04000)
{
printf ("Fix%04o", CurrentZ);
Bank = 2 + (CurrentZ - 04000) / 02000;
Value = State->Fixed[Bank][CurrentZ & 01777];
}
else if (CurrentZ < 02000)
{
Bank = 7 & Bp->Erasable[0][RegBB];
printf ("E%o,%04o", Bank, 01400 + (CurrentZ & 0377));
Value = Bp->Erasable[Bank][CurrentZ & 0377];
}
else
{
Bank = 037 & Bp->Erasable[0][RegBB] >> 10;
if (Bank >= 030 && (Bp->OutputChannel7 & 0100))
Bank += 010;
printf ("%02o,%04o", Bank, 02000 + (CurrentZ & 01777));
Value = State->Fixed[Bank][CurrentZ & 01777];
}
if (Bp->DueToInterrupt)
printf (" Int%02o ", Bp->DueToInterrupt);
else
printf (" %05o ", Value & 077777);
#else
{
char funcname[10];
SymbolLine_t *Line = NULL;
int CurrentZ = Bp->Erasable[0][RegZ] & 07777;
int FB = 037 & (Bp->Erasable[0][RegBB] >> 10);
int SBB = (Bp->OutputChannel7 & 0100) ? 1 : 0;
Line = ResolveLineAGC(CurrentZ, FB, SBB);
if (Line)
{
#ifdef WIN32
printf("#%d\t0x%04x in %s () at %s\\%s:%d\n",i+1,
gdbmiLinearAddr(&Line->CodeAddress),
gdbmiConstructFuncName(&Line->CodeAddress,funcname),SourcePathName,
Line->FileName,Line->LineNumber);
#else
printf("#%d\t0x%04x in %s () at %s/%s:%d\n",i+1,
gdbmiLinearAddr(&Line->CodeAddress),
gdbmiConstructFuncName(&Line->CodeAddress,funcname),SourcePathName,
Line->FileName,Line->LineNumber);
#endif
}
else
printf("#%d\t0x%04x in <%02o+%04o> ()\n",
i+1,
gdbmiLinearFixedAddr(CurrentZ,FB,SBB),
FB+8*SBB,CurrentZ);
}
#endif
// Next ...
j++;
if (j >= BACKTRACES_PER_LINE)
{
j = 0;
#ifndef GDBMI
printf ("\n");
#endif
}
}
#ifndef GDBMI
if (j != 0)
printf ("\n");
#endif
}