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Kernel+LibC: Pass 64-bit integers in syscalls by value

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Now that support for 32-bit x86 has been removed, we don't have to worry
about the top half of `off_t`/`u64` values being chopped off when we try
to pass them in registers. Therefore, we no longer need the workaround
of pointers to stack-allocated values to syscalls.

Note that this changes the system call ABI, so statically linked
programs will have to be re-linked.
This commit is contained in:
Daniel Bertalan 2023-08-11 10:47:31 +02:00
parent 87f4b0f1c2
commit 286984750e
12 changed files with 22 additions and 37 deletions
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4
Kernel/Syscalls/fallocate.cpp
View file

@ -13,16 +13,14 @@
namespace Kernel {
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, Userspace<off_t const*> userspace_offset, Userspace<off_t const*> userspace_length)
ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, off_t offset, off_t length)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::stdio));
// [EINVAL] The len argument is less than zero, or the offset argument is less than zero, or the underlying file system does not support this operation.
auto offset = TRY(copy_typed_from_user(userspace_offset));
if (offset < 0)
return EINVAL;
auto length = TRY(copy_typed_from_user(userspace_length));
if (length <= 0)
return EINVAL;