Commit Graph

5 Commits

Author SHA1 Message Date
Alex Brachet 2c73c26666 [libc] Add Convenience syscall Template Function
Summary: This patch adds a convenience template function so we don't need to cast all types to `long` manually when calling `__llvm_libc::syscall`.

Reviewers: sivachandra, MaskRay, gchatelet

Reviewed By: sivachandra

Subscribers: libc-commits, tschuett

Differential Revision: https://reviews.llvm.org/D74530
2020-02-13 14:39:16 -05:00
Alex Brachet a8cb0cf500 [libc][NFC] clang-format syscall.h.in
Reviewers: sivachandra

Reviewed By: sivachandra

Subscribers: MaskRay, tschuett, libc-commits

Differential Revision: https://reviews.llvm.org/D74570
2020-02-13 14:02:20 -05:00
Siva Chandra Reddy 6598af4a54 [libc] Add __attribute__((always_inline)) to x86_64 syscall functions.
Summary:
Some syscalls like SYS_clone do not tolerate a return instruction after
the syscall instruction. Marking the syscall functions with the
`always_inline` attribute accommodates such syscalls as inlining
eliminates the return instruction.

Reviewers: abrachet, phosek

Subscribers: MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D72102
2020-01-06 21:19:17 -08:00
Siva Chandra Reddy 5b24c08817 [libc] Move all tests to a top level `test` directory.
A toplevel target, `check-libc` has also been added.

Reviewers: abrachet, phosek

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D72177
2020-01-06 10:14:43 -08:00
Siva Chandra Reddy e5a743c4f6 Add implementations of POSIX mmap and munmap functions.
Summary:
A set of of linux x86_64 internal syscall helpers have also been added.

This change does not try to be perfect with respect to OS and machine
abstractions. A TODO note has been added at places where such abstractions
would help and make the arrangement scalable and cleaner. Addressing the
TODOs and building such abstractions is not in the scope of this change.
It is hoped that follow up changes cleaning up the problem areas and
addressing the TODOs will better illustrate the need for the changes.

This change also does not try to imitate mmap and munmap implementations
of other libcs. The idea here is to put in the bare minimum required to
obtain a working mmap and munmap, and then add the rest of the
functionality on an as needed basis.

Reviewers: abrachet, phosek, stanshebs, theraven

Subscribers: mgorny, MaskRay, jfb, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D71634
2019-12-23 14:04:02 -08:00