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Use name-indirection for all registers

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This commit is contained in:
Aaron Culliney 2014-06-07 13:44:14 -07:00
parent 30cf264aa6
commit 23e6e0ea75
3 changed files with 18 additions and 21 deletions
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2
src/x86/cpu-regs.h
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@ -32,7 +32,9 @@
# error not ready
#else
# define SZ_PTR 4
# define _XSP %esp /* x86 stack pointer */
# define _XAX %eax /* scratch */
# define _XBX %ebx /* scratch2 */
# define XY_Reg_X %ebx /* 6502 X&Y flags */
# define AF_Reg_X %ecx /* 6502 F&A flags */
# define SP_Reg_X %edx /* 6502 Stack pointer */

31
src/x86/cpu.S
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@ -82,7 +82,7 @@
#define BranchXCycles \
incb DebugCycleCount; /* +1 branch taken */ \
shll $16, %ebx; \
shll $16, _XBX; \
movw PC_Reg, %bx; \
cbw; \
addw %bx, %ax; \
@ -90,7 +90,7 @@
cmpb %ah, %bh; \
je 9f; \
incb DebugCycleCount; /* +1 branch new page */ \
9: shrl $16, %ebx;
9: shrl $16, _XBX;
#define FlagC lahf; \
andb $C_Flag, %ah; \
@ -2047,20 +2047,16 @@ E(cpu65_run)
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)
*
* Note: dependent on assignment of registers
*/
// Zero all used registers
xorl _XAX, _XAX
xorl %ebx, %ebx
xorl %ecx, %ecx
xorl %esi, %esi
xorl %edi, %edi
xorl XY_Reg_X, XY_Reg_X
xorl AF_Reg_X, AF_Reg_X
xorl PC_Reg_X, PC_Reg_X
xorl EffectiveAddr_X, EffectiveAddr_X
movl $0x1FF, SP_Reg_X
jmp ex_reset
exit_cpu65_run: // Return to timing loop ...
exit_cpu65_run:
// Save CPU state when returning from being called from C
xorl _XAX, _XAX
movw EffectiveAddr, DebugCurrEA
@ -2075,7 +2071,7 @@ exit_cpu65_run: // Return to timing
popal
ret
emul_reinit: movb $0, SN(cpu65__signal) // Return to timing loop ...
emul_reinit: movb $0, SN(cpu65__signal)
movb $1, SN(emul_reinitialize)
popal
ret
@ -2085,11 +2081,10 @@ emul_reinit: movb $0, SN(cpu65__signal) // Return to timing
------------------------------------------------------------------------- */
E(cpu65_direct_write)
/* NB: dependent on register choices */
pushl %edi
movl 8(%esp),%edi
movl 12(%esp),_XAX
pushl EffectiveAddr_X
movl 8(_XSP),EffectiveAddr_X
movl 12(_XSP),_XAX
call *SN(cpu65_vmem)+4(,EffectiveAddr_X,SZ_PTR*2)
popl %edi
popl EffectiveAddr_X
ret

6
src/x86/glue-prologue.h
View File

@ -68,8 +68,8 @@ E(func) pushl _XAX; \
pushl _XAX; \
pushl EffectiveAddr_X; \
call SN(c_##func); \
popl %edx; /* dummy */ \
popl %edx; /* dummy */ \
popl EffectiveAddr_X; /* dummy */ \
popl _XAX; /* dummy */ \
popl PC_Reg_X; \
popl SP_Reg_X; \
popl AF_Reg_X; \
@ -86,7 +86,7 @@ E(func) pushl XY_Reg_X; \
pushl _XAX; /* HACK: works around mysterious issue with generated mov(_XAX), _XAX ... */ \
pushl EffectiveAddr_X; \
call SN(c_##func); \
popl %edx; /* dummy */ \
popl EffectiveAddr_X; /* dummy */ \
movb %al, %dl; \
popl _XAX; /* ... ugh */ \
movb %dl, %al; \