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UserspaceEmulator: Add an initial stack and implement PUSH/POP reg32

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Programs now start out with a 64 KB stack at 0x10000000. :^)
This commit is contained in:
Andreas Kling 2020-07-09 16:20:08 +02:00
parent d5c46cf528
commit d10765bec3
3 changed files with 99 additions and 5 deletions
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46
DevTools/UserspaceEmulator/Emulator.cpp
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@ -28,14 +28,54 @@
#include "SoftCPU.h"
#include <AK/LogStream.h>
#include <Kernel/API/Syscall.h>
#include <unistd.h>
#include <stdio.h>
#include <unistd.h>
namespace UserspaceEmulator {
static constexpr u32 stack_location = 0x10000000;
static constexpr size_t stack_size = 64 * KB;
class SimpleRegion final : public SoftMMU::Region {
public:
SimpleRegion(u32 base, u32 size)
: Region(base, size)
{
m_data = (u8*)malloc(size);
}
~SimpleRegion()
{
free(m_data);
}
virtual u32 read32(u32 offset) override
{
ASSERT(offset + 3 < size());
return *reinterpret_cast<const u32*>(m_data + offset);
}
virtual void write32(u32 offset, u32 value) override
{
ASSERT(offset + 3 < size());
*reinterpret_cast<u32*>(m_data + offset) = value;
}
private:
u8* m_data { nullptr };
};
Emulator::Emulator()
: m_cpu(*this)
{
setup_stack();
}
void Emulator::setup_stack()
{
auto stack_region = make<SimpleRegion>(stack_location, stack_size);
m_mmu.add_region(move(stack_region));
m_cpu.set_esp(stack_location + stack_size);
}
int Emulator::exec(X86::SimpleInstructionStream& stream, u32 base)
@ -59,8 +99,8 @@ int Emulator::exec(X86::SimpleInstructionStream& stream, u32 base)
u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
{
(void) arg2;
(void) arg3;
(void)arg2;
(void)arg3;
printf("Syscall: %s (%x)\n", Syscall::to_string((Syscall::Function)function), function);
switch (function) {