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https://github.com/mauiaaron/apple2.git
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105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* Apple // emulator for *ix
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*
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* This software package is subject to the GNU General Public License
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* version 3 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* Copyright 2013-2015 Aaron Culliney
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*
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*/
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#ifndef _CPU_REGS_H_
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#define _CPU_REGS_H_
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#include "cpu.h"
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// ARM register mappings
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// r0, r1 are scratch regs, with r0 generally as the "important byte"
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#define EffectiveAddr r2 /* 16bit Effective address */
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#define PC_Reg r3 /* 16bit 6502 Program Counter */
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#define SP_Reg r4 /* 16bit 6502 Stack pointer */
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#define F_Reg r5 /* 8bit 6502 flags */
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#define Y_Reg r6 /* 8bit 6502 Y register */
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#define X_Reg r7 /* 8bit 6502 X register */
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#define A_Reg r8 /* 8bit 6502 A register */
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// r9 is "ARM platform register" ... used as a scratch register
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// r10 is another scratch variable
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#define reg_vmem_r r11 /* cpu65_vmem_r table address */
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// r12 is "ARM Intra-Procedure-call scratch register" ... used as a scratch register
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// r13 ARM SP
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// r14 ARM return addr
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// r15 ARM PC
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#ifdef __aarch64__
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# error 20150205 ARM 64bit untested!!!
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# define PTR_SHIFT #4 // 4<<1 = 8
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# define ROR_BIT 0x8000000000000000
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#else
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# define PTR_SHIFT #2 // 2<<1 = 4
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# define ROR_BIT 0x80000000
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#endif
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#if !defined(__APPLE__)
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# define NO_UNDERSCORES 1
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# define STRBNE strneb
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#else
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# define STRBNE strbne
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#endif
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#if NO_UNDERSCORES
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# define ENTRY(x) .globl x; .arm; .balign 4; x##:
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# define CALL(x) x
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#else
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# define ENTRY(x) .globl _##x; .arm; .balign 4; _##x##:
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# define CALL(x) _##x
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#endif
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// 2015/11/08 NOTE : Android requires all apps targeting API 23 (AKA Marshmallow) to use Position Independent Code (PIC)
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// that does not have TEXT segment relocations
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#if !defined(__COUNTER__)
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#error __COUNTER__ macro should be available in modern compilers
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#endif
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#if __PIC__ && !__APPLE__
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// 2016/07/15 : TODO FIXME : this PIC code does not work on ARM-Darwin
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# define _SYM_ADDR_PRE(reg) \
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ldr reg, 5f;
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# define _SYM_ADDR_OFF_THUMB(reg,ct) \
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4: add reg, pc; \
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ldr reg, [reg];
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# define _SYM_ADDR_OFF_ARM(reg,ct) \
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4: ldr reg, [pc, reg];
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# define _SYM_ADDR_POST(var,poff) \
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b 6f; \
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.align 2; \
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5: .word var(GOT_PREL)+(. - (4b + poff)); \
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6:
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# if defined(THUMB)
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# define SYM(reg,var) \
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_SYM_ADDR_PRE(reg) \
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_SYM_ADDR_OFF_THUMB(reg, __COUNTER__); \
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_SYM_ADDR_POST(var,4)
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# else
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# define SYM(reg,var) \
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_SYM_ADDR_PRE(reg) \
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_SYM_ADDR_OFF_ARM(reg, __COUNTER__); \
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_SYM_ADDR_POST(var,8)
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# endif
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#else
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# if NO_UNDERSCORES
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# define SYM(reg,var) \
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ldr reg, =var
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# else
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# define SYM(reg,var) \
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ldr reg, =_##var
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# endif
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#endif
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#endif // whole file
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