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UserspaceEmulator: Add some more syscalls

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We can now unmap mapped memory, among other things. This is all very
ad-hoc as I'm trying to run UserspaceEmulator inside itself. :^)
This commit is contained in:
Andreas Kling 2020-07-13 12:20:47 +02:00
parent 9b6464010f
commit e0580e2975
4 changed files with 48 additions and 1 deletions
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38
DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -188,6 +188,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
switch (function) {
case SC_mmap:
return virt$mmap(arg1);
case SC_munmap:
return virt$munmap(arg1, arg2);
case SC_gettid:
return virt$gettid();
case SC_getpid:
@ -222,11 +224,17 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$lseek(arg1, arg2, arg3);
case SC_get_process_name:
return virt$get_process_name(arg1, arg2);
case SC_dbgputstr:
return virt$dbgputstr(arg1, arg2);
case SC_dbgputch:
return virt$dbgputch(arg1);
case SC_kill:
return virt$kill(arg1, arg2);
case SC_exit:
virt$exit((int)arg1);
return 0;
default:
warn() << "Unimplemented syscall!";
warn() << "Unimplemented syscall: " << Syscall::to_string((Syscall::Function)function);
dump_backtrace();
TODO();
}
@ -247,6 +255,24 @@ int Emulator::virt$close(int fd)
return syscall(SC_close, fd);
}
int Emulator::virt$dbgputstr(FlatPtr characters, int length)
{
auto buffer = mmu().copy_buffer_from_vm(characters, length);
dbgputstr((const char*)buffer.data(), buffer.size());
return 0;
}
int Emulator::virt$dbgputch(char ch)
{
dbgputch(ch);
return 0;
}
int Emulator::virt$kill(pid_t pid, int signal)
{
return syscall(SC_kill, pid, signal);
}
int Emulator::virt$get_process_name(FlatPtr buffer, int size)
{
if (size < 9)
@ -303,6 +329,16 @@ u32 Emulator::virt$open(u32 params_addr)
return fd;
}
u32 Emulator::virt$munmap(FlatPtr address, u32 size)
{
auto* region = mmu().find_region({ 0x20, address });
ASSERT(region);
if (region->size() != round_up_to_power_of_two(size, PAGE_SIZE))
TODO();
mmu().remove_region(*region);
return 0;
}
u32 Emulator::virt$mmap(u32 params_addr)
{
Syscall::SC_mmap_params params;