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Implement file mapping functionality in linux_mmap()

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This commit is contained in:
EnderIce2 2024-02-02 01:58:31 +02:00
parent 9538b8ef31
commit d89f59a252
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 78 additions and 19 deletions
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97
syscalls/linux.cpp
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@ -236,9 +236,6 @@ static void *linux_mmap(SysFrm *, void *addr, size_t length, int prot,
if (length == 0)
return (void *)-EINVAL;
if (fildes != -1)
return (void *)-ENOSYS;
bool p_None = prot & sc_PROT_NONE;
bool p_Read = prot & sc_PROT_READ;
bool p_Write = prot & sc_PROT_WRITE;
@ -252,32 +249,23 @@ static void *linux_mmap(SysFrm *, void *addr, size_t length, int prot,
UNUSED(p_None);
UNUSED(m_Anon);
debug("N:%d R:%d W:%d E:%d",
p_None, p_Read, p_Write,
p_Exec);
debug("None:%d Read:%d Write:%d Exec:%d",
p_None, p_Read, p_Write, p_Exec);
debug("S:%d P:%d F:%d A:%d",
m_Shared, m_Private,
m_Fixed, m_Anon);
debug("Shared:%d Private:%d Fixed:%d Anon:%d",
m_Shared, m_Private, m_Fixed, m_Anon);
int UnknownFlags = flags & ~(sc_MAP_SHARED |
sc_MAP_PRIVATE |
sc_MAP_FIXED |
sc_MAP_ANONYMOUS);
if (UnknownFlags)
{
debug("Unknown flags: %x", UnknownFlags);
return (void *)-EINVAL;
/* We still have some flags missing afaik... */
fixme("Unknown flags: %x", UnknownFlags);
/* Allow? */
}
if (length > PAGE_SIZE_2M)
fixme("large page 2 MiB (requested %d)",
TO_MiB(length));
else if (length > PAGE_SIZE_1G)
fixme("huge page 1 GiB (requested %d)",
TO_GiB(length));
if (offset % PAGE_SIZE)
return (void *)-EINVAL;
@ -290,6 +278,77 @@ static void *linux_mmap(SysFrm *, void *addr, size_t length, int prot,
PCB *pcb = thisProcess;
Memory::VirtualMemoryArea *vma = pcb->vma;
if (fildes != -1 && !m_Anon)
{
fixme("File mapping not fully implemented");
vfs::FileDescriptorTable *fdt = pcb->FileDescriptors;
vfs::FileDescriptorTable::Fildes &_fd = fdt->GetDescriptor(fildes);
if (_fd.Descriptor != fildes)
{
debug("Invalid file descriptor %d", fildes);
return (void *)-EBADF;
}
if (p_Read)
{
Memory::Virtual vmm = Memory::Virtual(pcb->PageTable);
void *pBuf = vma->RequestPages(TO_PAGES(length));
debug("created buffer at %#lx-%#lx",
pBuf, (uintptr_t)pBuf + length);
uintptr_t mFlags = Memory::US;
if (p_Write)
mFlags |= Memory::RW;
if (m_Fixed)
{
if (m_Shared)
return (void *)-ENOSYS;
if (vmm.CheckRegion(addr, Memory::G))
{
debug("Address range %#lx-%#lx has a global page",
addr, (uintptr_t)addr + length);
// return (void *)-EINVAL;
}
vmm.Map(addr, pBuf, length, mFlags);
off_t oldOff = fdt->_lseek(fildes, 0, SEEK_CUR);
fdt->_lseek(fildes, offset, SEEK_SET);
ssize_t ret = fdt->_read(fildes, pBuf, length);
fdt->_lseek(fildes, oldOff, SEEK_SET);
if (ret < 0)
{
debug("Failed to read file");
return (void *)-ret;
}
return addr;
}
else
vmm.Map(pBuf, pBuf, length, mFlags);
off_t oldOff = fdt->_lseek(fildes, 0, SEEK_CUR);
fdt->_lseek(fildes, offset, SEEK_SET);
ssize_t ret = fdt->_read(fildes, pBuf, length);
fdt->_lseek(fildes, oldOff, SEEK_SET);
if (ret < 0)
{
debug("Failed to read file");
return (void *)-ret;
}
return pBuf;
}
debug("???");
return (void *)-ENOSYS;
}
intptr_t ret = (intptr_t)vma->CreateCoWRegion(addr, length,
p_Read, p_Write, p_Exec,
m_Fixed, m_Shared);