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Keep a global direction flag register

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Change the push/pop functions for correct 16-bit SP increase/descrease


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1561
This commit is contained in:
Sjoerd van der Berg 2004-01-11 12:29:03 +00:00
parent 2394f38514
commit 2b919b0ffe
1 changed files with 6 additions and 5 deletions
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11
src/cpu/cpu.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: cpu.cpp,v 1.49 2004-01-10 18:42:28 qbix79 Exp $ */
/* $Id: cpu.cpp,v 1.50 2004-01-11 12:29:03 harekiet Exp $ */
#include <assert.h>
#include "dosbox.h"
@ -67,24 +67,24 @@ void CPU_Core_Dyn_X86_Init(void);
void CPU_Push16(Bitu value) {
reg_esp-=2;
reg_esp=(reg_esp&~cpu.stack.mask)|(reg_esp-2)&cpu.stack.mask;
mem_writew(SegPhys(ss) + (reg_esp & cpu.stack.mask) ,value);
}
void CPU_Push32(Bitu value) {
reg_esp-=4;
reg_esp=(reg_esp&~cpu.stack.mask)|(reg_esp-4)&cpu.stack.mask;
mem_writed(SegPhys(ss) + (reg_esp & cpu.stack.mask) ,value);
}
Bitu CPU_Pop16(void) {
Bitu val=mem_readw(SegPhys(ss) + (reg_esp & cpu.stack.mask));
reg_esp+=2;
reg_esp=(reg_esp&~cpu.stack.mask)|(reg_esp+2)&cpu.stack.mask;
return val;
}
Bitu CPU_Pop32(void) {
Bitu val=mem_readd(SegPhys(ss) + (reg_esp & cpu.stack.mask));
reg_esp+=4;
reg_esp=(reg_esp&~cpu.stack.mask)|(reg_esp+4)&cpu.stack.mask;
return val;
}
@ -100,6 +100,7 @@ PhysPt SelBase(Bitu sel) {
void CPU_SetFlags(Bitu word,Bitu mask) {
reg_flags=(reg_flags & ~mask)|(word & mask)|2;
cpu.direction=1-((reg_flags & FLAG_DF) >> 9);
}
class TaskStateSegment {