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Kernel+LibC: Pass 64-bit integers in syscalls by value
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.
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12 changed files with 22 additions and 37 deletions
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@ -9,13 +9,10 @@
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namespace Kernel {
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// NOTE: The length is passed by pointer because off_t is 64bit,
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// hence it can't be passed by register on 32bit platforms.
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ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t const*> userspace_length)
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ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, off_t length)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto length = TRY(copy_typed_from_user(userspace_length));
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if (length < 0)
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return EINVAL;
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auto description = TRY(open_file_description(fd));
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