linux - rust/helpers/helpers.c

108 lines · 3.1 KiB

1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* Non-trivial C macros cannot be used in Rust. Similarly, inlined C functions
4	* cannot be called either. This file explicitly creates functions ("helpers")
5	* that wrap those so that they can be called from Rust.
6	*
7	* Sorted alphabetically.
8	*/
9
10	#include <linux/compiler_types.h>
11
12	#ifdef __BINDGEN__
13	// Omit `inline` for bindgen as it ignores inline functions.
14	#define __rust_helper
15	#else
16	// The helper functions are all inline functions.
17	//
18	// We use `__always_inline` here to bypass LLVM inlining checks, in case the
19	// helpers are inlined directly into Rust CGUs.
20	//
21	// The LLVM inlining checks are false positives:
22	// * LLVM doesn't want to inline functions compiled with
23	// `-fno-delete-null-pointer-checks` with code compiled without.
24	// The C CGUs all have this enabled and Rust CGUs don't. Inlining is okay
25	// since this is one of the hardening features that does not change the ABI,
26	// and we shouldn't have null pointer dereferences in these helpers.
27	// * LLVM doesn't want to inline functions with different list of builtins. C
28	// side has `-fno-builtin-wcslen`; `wcslen` is not a Rust builtin, so they
29	// should be compatible, but LLVM does not perform inlining due to attributes
30	// mismatch.
31	// * clang and Rust doesn't have the exact target string. Clang generates
32	// `+cmov,+cx8,+fxsr` but Rust doesn't enable them (in fact, Rust will
33	// complain if `-Ctarget-feature=+cmov,+cx8,+fxsr` is used). x86-64 always
34	// enable these features, so they are in fact the same target string, but
35	// LLVM doesn't understand this and so inlining is inhibited. This can be
36	// bypassed with `--ignore-tti-inline-compatible`, but this is a hidden
37	// option.
38	#define __rust_helper __always_inline
39	#endif
40
41	#include "atomic.c"
42	#include "atomic_ext.c"
43	#include "auxiliary.c"
44	#include "barrier.c"
45	#include "binder.c"
46	#include "bitmap.c"
47	#include "bitops.c"
48	#include "blk.c"
49	#include "bug.c"
50	#include "build_assert.c"
51	#include "build_bug.c"
52	#include "clk.c"
53	#include "completion.c"
54	#include "cpu.c"
55	#include "cpufreq.c"
56	#include "cpumask.c"
57	#include "cred.c"
58	#include "device.c"
59	#include "dma.c"
60	#ifdef CONFIG_DMA_SHARED_BUFFER
61	#include "dma-resv.c"
62	#endif
63	#include "drm.c"
64	#include "drm_gpuvm.c"
65	#include "err.c"
66	#include "fs.c"
67	#include "fwctl.c"
68	#include "gpu.c"
69	#include "interrupt.c"
70	#include "io.c"
71	#include "irq.c"
72	#include "jump_label.c"
73	#include "kunit.c"
74	#include "list.c"
75	#include "maple_tree.c"
76	#include "mm.c"
77	#include "mutex.c"
78	#include "net/genetlink.c"
79	#include "of.c"
80	#include "page.c"
81	#include "pci.c"
82	#include "pid_namespace.c"
83	#include "platform.c"
84	#include "poll.c"
85	#include "processor.c"
86	#include "property.c"
87	#include "pwm.c"
88	#include "rbtree.c"
89	#include "rcu.c"
90	#include "refcount.c"
91	#include "regulator.c"
92	#include "scatterlist.c"
93	#include "security.c"
94	#include "serdev.c"
95	#include "signal.c"
96	#include "slab.c"
97	#include "spinlock.c"
98	#include "string.c"
99	#include "srcu.c"
100	#include "sync.c"
101	#include "task.c"
102	#include "time.c"
103	#include "uaccess.c"
104	#include "usb.c"
105	#include "vmalloc.c"
106	#include "wait.c"
107	#include "workqueue.c"
108	#include "xarray.c"