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Forwards most of the Z80 state.

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This commit is contained in:
Thomas Harte
2021-04-25 13:00:43 -04:00
parent 485c2a866c
commit cc78bfb229
5 changed files with 97 additions and 33 deletions
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65
Storage/State/SNA.cpp
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@@ -7,40 +7,65 @@
//
#include "SNA.hpp"
#include "../FileHolder.hpp"
#include "../../Analyser/Static/ZXSpectrum/Target.hpp"
#include "../../Machines/Sinclair/ZXSpectrum/State.hpp"
using namespace Storage::State;
std::unique_ptr<Analyser::Static::Target> SNA::load(const std::string &file_name) {
using Target = Analyser::Static::ZXSpectrum::Target;
auto result = std::make_unique<Target>();
// Make sure the file is accessible and appropriately sized.
FileHolder file(file_name);
if(file.stats().st_size != 48*1024 + 0x1b) {
return nullptr;
}
// SNAs are always for 48kb machines.
using Target = Analyser::Static::ZXSpectrum::Target;
auto result = std::make_unique<Target>();
result->model = Target::Model::FortyEightK;
// 0x1a byte header:
//
// Prepare to populate ZX Spectrum state.
auto *const state = new Sinclair::ZXSpectrum::State();
result->state = std::unique_ptr<Reflection::Struct>(state);
// Comments below: [offset] [contents]
// 00 I
// 01 HL'
// 03 DE'
// 05 BC'
// 07 AF'
// 09 HL
// 0B DE
// 0D BC
// 0F IY
// 11 IX
const uint8_t i = file.get8();
// 01 HL'; 03 DE'; 05 BC'; 07 AF'
state->z80.registers.hlDash = file.get16le();
state->z80.registers.deDash = file.get16le();
state->z80.registers.bcDash = file.get16le();
state->z80.registers.afDash = file.get16le();
// 09 HL; 0B DE; 0D BC; 0F IY; 11 IX
state->z80.registers.hl = file.get16le();
state->z80.registers.de = file.get16le();
state->z80.registers.bc = file.get16le();
state->z80.registers.iy = file.get16le();
state->z80.registers.ix = file.get16le();
// 13 IFF2 (in bit 2)
const uint8_t iff = file.get8();
state->z80.registers.iff1 = state->z80.registers.iff2 = iff & 4;
// 14 R
// 15 AF
// 17 SP
// 19 interrupt mode
const uint8_t r = file.get8();
state->z80.registers.ir = uint16_t((i << 8) | r);
// 15 AF; 17 SP; 19 interrupt mode
state->z80.registers.flags = file.get8();
state->z80.registers.a = file.get8();
state->z80.registers.stack_pointer = file.get16le();
state->z80.registers.interrupt_mode = file.get8();
// TODO: border colour, RAM contents, then pop the program counter.
// 1A border colour
// 1B– 48kb RAM contents
//
// (perform a POP to get the PC)
(void)file_name;
return result;
}