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Fix: (1) memory base adjustment; (2) out-of-bounds writes.

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This commit is contained in:
Thomas Harte 2021-07-21 21:49:20 -04:00
parent 5401744dc0
commit 3ee1fc544f
1 changed files with 18 additions and 9 deletions
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27
Machines/Amiga/Amiga.cpp
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@ -20,6 +20,7 @@
#include "../Utility/MemoryPacker.hpp"
#include "../Utility/MemoryFuzzer.hpp"
//#define NDEBUG
#define LOG_PREFIX "[Amiga] "
#include "../../Outputs/Log.hpp"
@ -73,7 +74,7 @@ class ConcreteMachine:
// Check for assertion of reset.
if(cycle.operation & Microcycle::Reset) {
memory_.reset();
LOG("Unhandled Reset; PC is around " << PADHEX(8) << mc68000_.get_state().program_counter);
LOG("Reset; PC is around " << PADHEX(8) << mc68000_.get_state().program_counter);
}
// Do nothing if no address is exposed.
@ -83,7 +84,7 @@ class ConcreteMachine:
// Grab the target address to pick a memory source.
const uint32_t address = cycle.host_endian_byte_address();
// if(cycle.operation & (Microcycle::SelectByte | Microcycle::SelectWord)) {
// if((cycle.operation & (Microcycle::SelectByte | Microcycle::SelectWord)) && !(cycle.operation & Microcycle::IsProgram)) {
// printf("%06x\n", *cycle.address);
// }
@ -213,7 +214,9 @@ class ConcreteMachine:
#undef RW
} else {
// This'll do for open bus, for now.
cycle.set_value16(0xffff);
if(cycle.operation & Microcycle::Read) {
cycle.set_value16(0xffff);
}
LOG("Unmapped access to " << PADHEX(4) << *cycle.address);
}
}
@ -234,8 +237,8 @@ class ConcreteMachine:
// MARK: - Memory map.
struct MemoryMap {
public:
std::array<uint8_t, 512*1024> ram_;
std::array<uint8_t, 512*1024> kickstart_;
std::array<uint8_t, 512*1024> ram_{};
std::array<uint8_t, 512*1024> kickstart_{0xff};
struct MemoryRegion {
uint8_t *contents = nullptr;
@ -273,9 +276,13 @@ class ConcreteMachine:
overlay_ = enabled;
if(enabled) {
set_region(0x00'0000, 0x08'00000, kickstart_.data(), CPU::MC68000::Microcycle::PermitRead);
set_region(0x00'0000, 0x08'0000, kickstart_.data(), CPU::MC68000::Microcycle::PermitRead);
} else {
set_region(0x00'0000, 0x08'00000, ram_.data(), CPU::MC68000::Microcycle::PermitRead | CPU::MC68000::Microcycle::PermitWrite);
// Mirror RAM to fill out the address range up to $20'0000 (?)
set_region(0x00'0000, 0x08'0000, ram_.data(), CPU::MC68000::Microcycle::PermitRead | CPU::MC68000::Microcycle::PermitWrite);
set_region(0x08'0000, 0x10'0000, ram_.data(), CPU::MC68000::Microcycle::PermitRead | CPU::MC68000::Microcycle::PermitWrite);
set_region(0x10'0000, 0x18'0000, ram_.data(), CPU::MC68000::Microcycle::PermitRead | CPU::MC68000::Microcycle::PermitWrite);
set_region(0x18'0000, 0x20'0000, ram_.data(), CPU::MC68000::Microcycle::PermitRead | CPU::MC68000::Microcycle::PermitWrite);
}
}
@ -286,8 +293,9 @@ class ConcreteMachine:
assert(!(start & ~0xfc'0000));
assert(!((end - (1 << 18)) & ~0xfc'0000));
base -= start;
for(int c = start >> 18; c < end >> 18; c++) {
regions_[c].contents = base - (c << 18);
regions_[c].contents = base;
regions_[c].read_write_mask = read_write_mask;
}
}
@ -315,7 +323,7 @@ class ConcreteMachine:
void set_port_output(MOS::MOS6526::Port port, uint8_t value) {
if(port) {
// Parallel port output.
LOG("TODO: parallel output " << PADHEX(2) << value);
LOG("TODO: parallel output " << PADHEX(2) << +value);
} else {
// b7: /FIR1
// b6: /FIR0
@ -326,6 +334,7 @@ class ConcreteMachine:
// b1: /LED [output]
// b0: OVL [output]
LOG("LED & memory map: " << PADHEX(2) << +value);
if(observer_) {
observer_->set_led_status(led_name, !(value & 2));
}