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Support non-fixed and anonymous remote mmap

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This commit is contained in:
bjorn3
2025-12-09 20:55:19 +01:00
parent 58a362844a
commit 5a11067f10
1 changed files with 35 additions and 18 deletions
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src/scheme/proc.rs
+35 -18
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@@ -9,7 +9,7 @@ use crate::{
},
memory::PAGE_SIZE,
ptrace,
scheme::{self, FileHandle, KernelScheme},
scheme::{self, memory::MemoryScheme, FileHandle, KernelScheme},
sync::{CleanLockToken, RwLock, L1},
syscall::{
data::{GrantDesc, Map, SetSighandlerData, Stat},
@@ -878,24 +878,41 @@ impl ContextHandle {
let page_span = crate::syscall::validate_region(next()??, next()??)?;
let flags = MapFlags::from_bits(next()??).ok_or(Error::new(EINVAL))?;
if !flags.contains(MapFlags::MAP_FIXED) {
return Err(Error::new(EOPNOTSUPP));
if fd == !0 {
if op == ADDRSPACE_OP_TRANSFER {
return Err(Error::new(EOPNOTSUPP));
}
return MemoryScheme::fmap_anonymous(
&addrspace,
&Map {
offset,
size: page_span.count * PAGE_SIZE,
address: page_span.base.start_address().data(),
flags,
},
false,
token,
);
} else {
let (scheme, number) = extract_scheme_number(fd, token)?;
// ADDRSPACE_OP_MMAP and ADDRSPACE_OP_TRANSFER return the target address
// rather than the amount of written bytes.
// FIXME maybe make all these operations calls rather than writes?
return scheme.kfmap(
number,
&addrspace,
&Map {
offset,
size: page_span.count * PAGE_SIZE,
address: page_span.base.start_address().data(),
flags,
},
op == ADDRSPACE_OP_TRANSFER,
token,
);
}
let (scheme, number) = extract_scheme_number(fd, token)?;
scheme.kfmap(
number,
&addrspace,
&Map {
offset,
size: page_span.count * PAGE_SIZE,
address: page_span.base.start_address().data(),
flags,
},
op == ADDRSPACE_OP_TRANSFER,
token,
)?;
}
ADDRSPACE_OP_MUNMAP => {
let page_span = crate::syscall::validate_region(next()??, next()??)?;