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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
Userland/Libraries/LibC/unistd.cpp
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@ -392,7 +392,7 @@ ssize_t pread(int fd, void* buf, size_t count, off_t offset)
{
__pthread_maybe_cancel();
int rc = syscall(SC_pread, fd, buf, count, &offset);
int rc = syscall(SC_pread, fd, buf, count, offset);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
@ -897,7 +897,7 @@ char* getlogin()
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html
int ftruncate(int fd, off_t length)
{
int rc = syscall(SC_ftruncate, fd, &length);
int rc = syscall(SC_ftruncate, fd, length);
__RETURN_WITH_ERRNO(rc, rc, -1);
}