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inline macros used once and brace apple vm specific code

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This commit is contained in:
Aaron Culliney 2014-06-07 13:08:01 -07:00
parent b10593796c
commit 05e10b7eb8
2 changed files with 34 additions and 43 deletions
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2
src/apple2.h
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@ -21,6 +21,8 @@
#include "config.h"
#endif
// Virtual machine is an Apple ][ (not an NES, etc...)
#define __APPLE2_VM__ 1
/* Symbol naming issues */
#ifdef NO_UNDERSCORES

75
src/x86/cpu.S
View File

@ -14,8 +14,8 @@
*
*/
#include "apple2.h"
#include "cpu-regs.h"
#include "apple2.h"
#include "misc.h"
#define DebugCurrEA SN(cpu65_debug)
@ -80,46 +80,6 @@
#define Continue \
jmp continue;
/*
* Save CPU state when returning from being called from C
*/
#define SaveState \
xorl _XAX, _XAX; \
movw EffectiveAddr, DebugCurrEA; \
movw PC_Reg, SN(cpu65_current); \
movb A_Reg, SN(cpu65_current)+2; \
movb F_Reg, %al; \
movb SN(cpu65_flags_encode)(,_XAX,1), %al; \
movb %al, SN(cpu65_current)+3; \
movb X_Reg, SN(cpu65_current)+4; \
movb Y_Reg, SN(cpu65_current)+5; \
movb SP_Reg_L, SN(cpu65_current)+6;
/* Restore CPU state when being called from C.
*
* The xorls clear the high parts of the registers
* Note: dependent on register assignment
*
* The extra bit at the end points the stack pointer at the alternate
* stack in ALTZP mode. (Note, this is not good -- I'd prefer to avoid
* polluting this module with Apple-specific stuff. But we need to do
* it, else aux-stack using programs will crash when debugged.)
*/
#define RestoreState \
movl $0x0100, SP_Reg_X; \
movzwl DebugCurrEA, EffectiveAddr_X; \
movzwl SN(cpu65_current), PC_Reg_X; \
movzbl SN(cpu65_current)+2, AF_Reg_X; \
movzbl SN(cpu65_current)+3, _XAX; \
movb SN(cpu65_flags_decode)(,_XAX,1), F_Reg; \
movzbl SN(cpu65_current)+4, XY_Reg_X; \
movb SN(cpu65_current)+5, Y_Reg; \
movb SN(cpu65_current)+6, SP_Reg_L; \
movl SN(base_stackzp), _XAX; \
subl $SN(apple_ii_64k), _XAX; /* $ for pointer addr */ \
orl _XAX, SP_Reg_X; \
xorl _XAX, _XAX;
#define BranchXCycles \
incb DebugCycleCount; /* +1 branch taken */ \
pushl %ebx; \
@ -2066,8 +2026,26 @@ E(cpu65_run)
pushal // ENTER CPURUN
cmpb $0, SN(emul_reinitialize)
jnz 1f
RestoreState
// Restore CPU state when being called from C.
movl $0x0100, SP_Reg_X
movzwl DebugCurrEA, EffectiveAddr_X
movzwl SN(cpu65_current), PC_Reg_X
movzbl SN(cpu65_current)+2, AF_Reg_X
movzbl SN(cpu65_current)+3, _XAX
movb SN(cpu65_flags_decode)(,_XAX,1), F_Reg
movzbl SN(cpu65_current)+4, XY_Reg_X
movb SN(cpu65_current)+5, Y_Reg
movb SN(cpu65_current)+6, SP_Reg_L
#ifdef __APPLE2_VM__
// Apple //e machine specific set stack point to ALTZP (or not)
movl SN(base_stackzp), _XAX
subl $SN(apple_ii_64k), _XAX
orl _XAX, SP_Reg_X
#endif
xorl _XAX, _XAX
jmp continue1
1: movb $0, SN(emul_reinitialize)
/* Zero all registers, as well as the unused 32-bit parts
* of variables. (which may need to be kept 0)
@ -2082,7 +2060,18 @@ E(cpu65_run)
movl $0x1FF, SP_Reg_X
jmp ex_reset
exit_cpu65_run: SaveState // Return to timing loop ...
exit_cpu65_run: // Return to timing loop ...
// Save CPU state when returning from being called from C
xorl _XAX, _XAX
movw EffectiveAddr, DebugCurrEA
movw PC_Reg, SN(cpu65_current)
movb A_Reg, SN(cpu65_current)+2
movb F_Reg, %al
movb SN(cpu65_flags_encode)(,_XAX,1), %al
movb %al, SN(cpu65_current)+3
movb X_Reg, SN(cpu65_current)+4
movb Y_Reg, SN(cpu65_current)+5
movb SP_Reg_L, SN(cpu65_current)+6
popal
ret