valter/dosbox-staging
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Add Exit conditions for stack over/underflows

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It's bad to continue when these states happen. Let's see if a game triggers it.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3861
This commit is contained in:
Peter Veenstra 2014-06-18 14:32:40 +00:00
parent bb807af8c7
commit a59544bf7d
2 changed files with 9 additions and 7 deletions
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8
src/fpu/fpu_instructions.h
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2002-2013 The DOSBox Team
* Copyright (C) 2002-2014 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -42,9 +42,7 @@ static void FPU_FNOP(void){
}
static void FPU_PUSH(double in){
TOP = (TOP - 1) &7;
//actually check if empty
fpu.tags[TOP] = TAG_Valid;
FPU_PREP_PUSH();
fpu.regs[TOP].d = in;
// LOG(LOG_FPU,LOG_ERROR)("Pushed at %d %g to the stack",newtop,in);
return;
@ -52,10 +50,12 @@ static void FPU_PUSH(double in){
static void FPU_PREP_PUSH(void){
TOP = (TOP - 1) &7;
if (GCC_UNLIKELY(fpu.tags[TOP] != TAG_Empty)) E_Exit("FPU stack overflow");
fpu.tags[TOP] = TAG_Valid;
}
static void FPU_FPOP(void){
if (GCC_UNLIKELY(fpu.tags[TOP] == TAG_Empty)) E_Exit("FPU stack underflow");
fpu.tags[TOP]=TAG_Empty;
//maybe set zero in it as well
TOP = ((TOP+1)&7);

8
src/fpu/fpu_instructions_x86.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2002-2013 The DOSBox Team
* Copyright (C) 2002-2014 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -957,11 +957,13 @@ static void FPU_FNOP(void){
static void FPU_PREP_PUSH(void){
TOP = (TOP - 1) &7;
fpu.tags[TOP]=TAG_Valid;
if (GCC_UNLIKELY(fpu.tags[TOP] != TAG_Empty)) E_Exit("FPU stack overflow");
fpu.tags[TOP] = TAG_Valid;
}
static void FPU_FPOP(void){
fpu.tags[TOP]=TAG_Empty;
if (GCC_UNLIKELY(fpu.tags[TOP] == TAG_Empty)) E_Exit("FPU stack underflow");
fpu.tags[TOP] = TAG_Empty;
TOP = ((TOP+1)&7);
}