mirror of https://github.com/bsnes-emu/bsnes.git
60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
auto ARM::Processor::power() -> void {
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r0 = r1 = r2 = r3 = r4 = r5 = r6 = r7 = 0;
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usr.r8 = usr.r9 = usr.r10 = usr.r11 = usr.r12 = usr.sp = usr.lr = 0;
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fiq.r8 = fiq.r9 = fiq.r10 = fiq.r11 = fiq.r12 = fiq.sp = fiq.lr = 0;
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irq.sp = irq.lr = 0;
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svc.sp = svc.lr = 0;
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abt.sp = abt.lr = 0;
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und.sp = und.lr = 0;
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pc = 0;
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carryout = false;
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irqline = false;
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cpsr = 0;
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spsr = nullptr;
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fiq.spsr = 0;
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irq.spsr = 0;
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svc.spsr = 0;
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abt.spsr = 0;
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und.spsr = 0;
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r[0] = &r0;
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r[1] = &r1;
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r[2] = &r2;
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r[3] = &r3;
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r[4] = &r4;
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r[5] = &r5;
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r[6] = &r6;
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r[7] = &r7;
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r[15] = &pc;
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}
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auto ARM::Processor::setMode(Mode mode) -> void {
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cpsr.m = 0x10 | (uint)mode;
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if(mode == Mode::FIQ) {
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r[ 8] = &fiq.r8;
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r[ 9] = &fiq.r9;
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r[10] = &fiq.r10;
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r[11] = &fiq.r11;
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r[12] = &fiq.r12;
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} else {
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r[ 8] = &usr.r8;
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r[ 9] = &usr.r9;
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r[10] = &usr.r10;
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r[11] = &usr.r11;
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r[12] = &usr.r12;
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}
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switch(mode) {
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case Mode::FIQ: r[13] = &fiq.sp; r[14] = &fiq.lr; spsr = &fiq.spsr; break;
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case Mode::IRQ: r[13] = &irq.sp; r[14] = &irq.lr; spsr = &irq.spsr; break;
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case Mode::SVC: r[13] = &svc.sp; r[14] = &svc.lr; spsr = &svc.spsr; break;
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case Mode::ABT: r[13] = &abt.sp; r[14] = &abt.lr; spsr = &abt.spsr; break;
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case Mode::UND: r[13] = &und.sp; r[14] = &und.lr; spsr = &und.spsr; break;
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default: r[13] = &usr.sp; r[14] = &usr.lr; spsr = nullptr; break;
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}
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}
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