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move around memory allocation

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This commit is contained in:
Kelvin Sherlock 2013-02-05 22:59:04 -05:00
parent a0e05db127
commit f97b6eae24
1 changed files with 42 additions and 22 deletions
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64
loader.cpp
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@ -10,18 +10,27 @@
#include <CoreServices/CoreServices.h>
uint8_t *memory;
uint32_t HighWater = 2048;
uint8_t *Memory;
uint32_t HighWater = 0x1000;
uint32_t MemorySize;
uint32_t EmulatedNewPtr(uint32_t size)
{
if (size & 0x01) size++;
if (HighWater + size > MemorySize)
{
fprintf(stderr, "Insufficient Memory!\n");
exit(EX_CONFIG);
}
uint32_t address = HighWater;
HighWater += size;
std::memset(memory + HighWater, 0, size);
std::memset(Memory + HighWater, 0, size);
return address;
}
@ -29,6 +38,7 @@ uint32_t EmulatedNewPtr(uint32_t size)
uint8_t ReadByte(const void *data, uint32_t offset)
{
offset &= 0xffffff;
if (offset >= MemorySize) return 0;
return ((uint8_t *)data)[offset];
}
@ -47,6 +57,7 @@ uint32_t ReadLong(const void *data, uint32_t offset)
void WriteByte(void *data, uint32_t offset, uint8_t value)
{
offset &= 0xffffff;
if (offset >= MemorySize) return;
((uint8_t *)data)[offset] = value;
}
@ -54,6 +65,8 @@ void WriteWord(void *data, uint32_t offset, uint16_t value)
{
offset &= 0xffffff;
if (offset + 1 >= MemorySize) return;
((uint8_t *)data)[offset++] = value >> 8;
((uint8_t *)data)[offset++] = value;
}
@ -62,6 +75,8 @@ void WriteLong(void *data, uint32_t offset, uint32_t value)
{
offset &= 0xffffff;
if (offset + 3 >= MemorySize) return;
((uint8_t *)data)[offset++] = value >> 24;
((uint8_t *)data)[offset++] = value >> 16;
((uint8_t *)data)[offset++] = value >> 8;
@ -96,7 +111,6 @@ uint32_t load(const char *file)
std::vector< std::pair<uint32_t, uint32_t> > segments; // segment, address
memory = new uint8_t[16 * 1024 * 1024];
uint32_t a5 = 0;
@ -151,17 +165,20 @@ uint32_t load(const char *file)
address = EmulatedNewPtr(a5size);
a5 = address + below;
std::memcpy(memory + a5 + jtOffset, data + 16 , jtSize);
std::memcpy(Memory + a5 + jtOffset, data + 16 , jtSize);
segments[resID] = std::make_pair(address, a5size);
jtStart = a5 + jtOffset;
jtEnd = jtStart + jtSize;
// 0x0934 - CurJTOffset (16-bit)
WriteWord(Memory, 0x934, jtOffset);
}
else
{
address = EmulatedNewPtr(size);
std::memcpy(memory + address, data, size);
std::memcpy(Memory + address, data, size);
segments[resID] = std::make_pair(address, size);
}
@ -174,11 +191,11 @@ uint32_t load(const char *file)
for (; jtStart < jtEnd; jtStart += 8)
{
uint16_t offset = ReadWord(memory, jtStart);
uint16_t seg = ReadWord(memory, jtStart + 4);
uint16_t offset = ReadWord(Memory, jtStart);
uint16_t seg = ReadWord(Memory, jtStart + 4);
assert(ReadWord(memory, jtStart + 2) == 0x3F3C);
assert(ReadWord(memory, jtStart + 6) == 0xA9F0);
assert(ReadWord(Memory, jtStart + 2) == 0x3F3C);
assert(ReadWord(Memory, jtStart + 6) == 0xA9F0);
assert(seg < segments.size());
@ -190,8 +207,8 @@ uint32_t load(const char *file)
uint32_t address = p.first + offset + 4;
// JMP absolute long
WriteWord(memory, jtStart + 2, 0x4EF9);
WriteLong(memory, jtStart + 4, address);
WriteWord(Memory, jtStart + 2, 0x4EF9);
WriteLong(Memory, jtStart + 4, address);
}
// set pc to jump table entry 0.
@ -210,7 +227,7 @@ void InitializeMPW(int argc, char **argv)
memcpy(str32 + 1, argv[0], l);
while (l < 32) str32[l++] = 0;
memcpy(memory + 0x910, str32, 32);
memcpy(Memory + 0x910, str32, 32);
}
@ -230,7 +247,7 @@ void InitializeMPW(int argc, char **argv)
uint32_t address;
length = strlen(argv[i]);
address = EmulatedNewPtr(length + 1);
memcpy(memory + address, argv[i], length + 1);
memcpy(Memory + address, argv[i], length + 1);
argvSpine.push_back(address);
}
@ -240,20 +257,20 @@ void InitializeMPW(int argc, char **argv)
uint32_t address = argvAddress;
for (uint32_t x : argvSpine)
{
WriteLong(memory, address, x);
WriteLong(Memory, address, x);
address += 4;
}
}
// same thing for envp... but \0 instead of =
uint32_t address = EmulatedNewPtr(8 + 10);
WriteLong(memory, 0x0316, address);
WriteLong(memory, address, 0x4d50474d); // MPGM - magic
WriteLong(memory, address + 4, address + 8); // block ptr
WriteWord(memory, address + 8, 0x5348); // SH - more magic
WriteWord(memory, address + 10, argc);
WriteWord(memory, address + 14, argvAddress);
WriteWord(memory, address + 18, envpAddress);
WriteLong(Memory, 0x0316, address);
WriteLong(Memory, address, 0x4d50474d); // MPGM - magic
WriteLong(Memory, address + 4, address + 8); // block ptr
WriteWord(Memory, address + 8, 0x5348); // SH - more magic
WriteWord(Memory, address + 10, argc);
WriteWord(Memory, address + 14, argvAddress);
WriteWord(Memory, address + 18, envpAddress);
}
@ -379,6 +396,9 @@ int main(int argc, char **argv)
exit(EX_USAGE);
}
Memory = new uint8_t[Flags.ram];
load(argv[0]);
InitializeMPW(argc, argv);