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UserspaceEmulator: Load the target executable ELF semi-properly :^)

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This patch adds a basic ELF program loader to the UserspaceEmulator and
creates MMU regions for each PT_LOAD header. (Note that we don't yet
respect the R/W/X flags etc.)

We also turn the SoftCPU into an X86::InstructionStream and give it an
EIP register so we can actually execute code by fetching memory through
our MMU abstraction.
This commit is contained in:
Andreas Kling 2020-07-11 16:45:48 +02:00
parent 0eab5659f8
commit ae1d14bc7a
5 changed files with 68 additions and 22 deletions
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15
DevTools/UserspaceEmulator/main.cpp
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@ -30,7 +30,6 @@
#include <AK/MappedFile.h>
#include <LibCore/ArgsParser.h>
#include <LibELF/Loader.h>
#include <LibX86/Instruction.h>
int main(int argc, char** argv)
{
@ -48,15 +47,9 @@ int main(int argc, char** argv)
auto elf = ELF::Loader::create((const u8*)mapped_file.data(), mapped_file.size());
auto _start_symbol = elf->find_demangled_function("_start");
if (!_start_symbol.has_value()) {
warn() << "Could not find '_start' symbol in executable";
return 1;
}
auto main_code = _start_symbol.value().raw_data();
X86::SimpleInstructionStream stream((const u8*)main_code.characters_without_null_termination(), main_code.length());
UserspaceEmulator::Emulator emulator;
return emulator.exec(stream, _start_symbol.value().value());
if (!emulator.load_elf(*elf))
return 1;
return emulator.exec();
}