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UserspaceEmulator: Add basic support for memory-mapped files

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MmapRegion now supports using an mmap'ed file descriptor as backing.
This commit is contained in:
Andreas Kling 2020-07-13 11:58:58 +02:00
parent 63d3f5d19b
commit 9b6464010f
3 changed files with 30 additions and 5 deletions
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23
DevTools/UserspaceEmulator/MmapRegion.cpp
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@ -30,16 +30,35 @@
namespace UserspaceEmulator {
NonnullOwnPtr<MmapRegion> MmapRegion::create_anonymous(u32 base, u32 size, u32 prot)
{
auto region = adopt_own(*new MmapRegion(base, size, prot));
region->m_file_backed = false;
region->m_data = (u8*)calloc(1, size);
return region;
}
NonnullOwnPtr<MmapRegion> MmapRegion::create_file_backed(u32 base, u32 size, u32 prot, int flags, int fd, off_t offset)
{
auto region = adopt_own(*new MmapRegion(base, size, prot));
region->m_file_backed = true;
region->m_data = (u8*)mmap(nullptr, size, prot, flags, fd, offset);
ASSERT(region->m_data != MAP_FAILED);
return region;
}
MmapRegion::MmapRegion(u32 base, u32 size, int prot)
: Region(base, size)
, m_prot(prot)
{
m_data = (u8*)calloc(1, size);
}
MmapRegion::~MmapRegion()
{
free(m_data);
if (m_file_backed)
munmap(m_data, size());
else
free(m_data);
}
u8 MmapRegion::read8(FlatPtr offset)