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Implement COW pages! :^)

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sys$fork() now clones all writable regions with per-page COW bits.
The pages are then mapped read-only and we handle a PF by COWing the pages.

This is quite delightful. Obviously there's lots of work to do still,
and it needs better data structures, but the general concept works.
This commit is contained in:
Andreas Kling 2018-11-05 13:48:07 +01:00
parent e85c22fe58
commit 2d045d2a64
11 changed files with 271 additions and 97 deletions
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27
Kernel/init.cpp
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@ -100,23 +100,34 @@ static void loadKsyms(const ByteBuffer& buffer)
s_ksyms_ready = true;
}
void dump_backtrace()
void dump_backtrace(bool use_ksyms)
{
if (!current)
if (!current) {
HANG;
return;
}
extern volatile bool ksyms_ready();
if (!ksyms_ready())
if (use_ksyms && !ksyms_ready()) {
HANG;
return;
dword stack_variable;
}
struct RecognizedSymbol {
dword address;
const KSym* ksym;
};
Vector<RecognizedSymbol> recognizedSymbols;
for (dword* stackPtr = &stack_variable; current->isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
dword retaddr = stackPtr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognizedSymbols.append({ retaddr, ksym });
if (use_ksyms) {
for (dword* stackPtr = (dword*)&use_ksyms; current->isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
dword retaddr = stackPtr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognizedSymbols.append({ retaddr, ksym });
}
} else{
for (dword* stackPtr = (dword*)&use_ksyms; current->isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
dword retaddr = stackPtr[1];
kprintf("%x (next: %x)\n", retaddr, stackPtr ? (dword*)*stackPtr : 0);
}
return;
}
size_t bytesNeeded = 0;
for (auto& symbol : recognizedSymbols) {