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UserspaceEmulator: Support sys$mremap()

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This makes UE able to run dynamically linked executables once again.
This commit is contained in:
Andreas Kling 2020-12-31 14:22:56 +01:00
parent fbf8751485
commit e27d281bf1
Notes: sideshowbarker 2024-07-19 00:18:50 +09:00
2 changed files with 21 additions and 0 deletions
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20
DevTools/UserspaceEmulator/Emulator.cpp
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@ -410,6 +410,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$mount(arg1);
case SC_munmap:
return virt$munmap(arg1, arg2);
case SC_mremap:
return virt$mremap(arg1);
case SC_gettid:
return virt$gettid();
case SC_getpid:
@ -1037,6 +1039,24 @@ u32 Emulator::virt$mmap(u32 params_addr)
return final_address;
}
FlatPtr Emulator::virt$mremap(FlatPtr params_addr)
{
Syscall::SC_mremap_params params;
mmu().copy_from_vm(&params, params_addr, sizeof(params));
if (auto* region = mmu().find_region({ m_cpu.ds(), params.old_address })) {
if (!region->is_mmap())
return -EINVAL;
ASSERT(region->size() == params.old_size);
auto& mmap_region = *(MmapRegion*)region;
auto* ptr = mremap(mmap_region.data(), mmap_region.size(), mmap_region.size(), params.flags);
if (ptr == MAP_FAILED)
return -errno;
return (FlatPtr)ptr;
}
return -EINVAL;
}
u32 Emulator::virt$mount(u32 params_addr)
{
Syscall::SC_mount_params params;