RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-16 17:45:07 +00:00
Code Issues Activity Actions

UserspaceEmulator: Make mmap'ed memory track read/write protection

Browse source 
Here's the first time we get a taste of better information than the
real hardware can give us: unlike x86 CPUs, we can actually support
write-only memory, so now we do!

While this isn't immediately useful, it's still pretty cool. :^)
This commit is contained in:
Andreas Kling 2020-07-13 11:40:21 +02:00
parent 27c1690504
commit f6ad5edab0
5 changed files with 190 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

13
DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -25,6 +25,7 @@
*/
#include "Emulator.h"
#include "MmapRegion.h"
#include "SimpleRegion.h"
#include "SoftCPU.h"
#include <AK/LexicalPath.h>
@ -44,10 +45,20 @@ namespace UserspaceEmulator {
static constexpr u32 stack_location = 0x10000000;
static constexpr size_t stack_size = 64 * KB;
static Emulator* s_the;
Emulator& Emulator::the()
{
ASSERT(s_the);
return *s_the;
}
Emulator::Emulator(const Vector<String>& arguments, NonnullRefPtr<ELF::Loader> elf)
: m_elf(move(elf))
, m_cpu(*this)
{
ASSERT(!s_the);
s_the = this;
setup_stack(arguments);
}
@ -315,7 +326,7 @@ u32 Emulator::virt$mmap(u32 params_addr)
next_address = final_address + final_size;
mmu().add_region(make<SimpleRegion>(final_address, final_size));
mmu().add_region(make<MmapRegion>(final_address, final_size, params.prot));
return final_address;
}