src/sys/compat/linux/linux_vdso.c, branch releng/15.0 FreeBSD source tree linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743 2023-08-18T10:12:02+00:00 Dmitry Chagin dchagin@FreeBSD.org 2023-08-18T10:12:02+00:00 3460fab5fced39c7ea597cc7de0ebc3e4c88989a 






linux(4): Update my copyrights, add SPDX tag
2023-08-17T20:54:36+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2023-08-17T20:54:36+00:00

c47116e90951621196c72b7def866cadfdabf80e












sys: Remove $FreeBSD$: one-line .c pattern
2023-08-16T17:54:36+00:00

Warner Losh
imp@FreeBSD.org

2023-08-16T17:54:36+00:00

685dc743dc3b5645e34836464128e1c0558b404b

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/





Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/







linux(4): Cleanup includes under compat/linux
2023-02-14T14:46:32+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2023-02-14T14:46:32+00:00

d8e53d94fae90cf3c83db5af0eaba0be0f55e00a

Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after:		2 weeks





Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after:		2 weeks







linux(4): Get rid of the opt_compat.h include.
2023-02-12T17:24:32+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2023-02-12T17:24:32+00:00

10d16789a383a5b9e007dfd4c2e7844e044eaf7d

Since e013e369 COMPAT_LINUX, COMPAT_LINUX32 build options are removed,
so include of opt_compat.h is no more needed.

MFC after:		2 weeks





Since e013e369 COMPAT_LINUX, COMPAT_LINUX32 build options are removed,
so include of opt_compat.h is no more needed.

MFC after:		2 weeks







Drop "All rights reserved" from my copyright statements.
2021-07-20T07:05:50+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2021-07-20T07:05:50+00:00

1ca6b15bbdcebd6a0726dae2e9b72f383139d16c

Add email and fixup years while here.

Reviewed by:		imp
Differential Revision:	https://reviews.freebsd.org/D30912
MFC after:		2 weeks





Add email and fixup years while here.

Reviewed by:		imp
Differential Revision:	https://reviews.freebsd.org/D30912
MFC after:		2 weeks







linux(4); Almost complete the vDSO.
2021-07-20T07:01:18+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2021-07-20T07:01:18+00:00

9931033bbfbe56a037723638cf3712366c6d943f

The vDSO (virtual dynamic shared object) is a small shared library that the
kernel maps R/O into the address space of all Linux processes on image
activation. The vDSO is a fully formed ELF image, shared by all processes
with the same ABI, has no process private data.

The primary purpose of the vDSO:
- non-executable stack, signal trampolines not copied to the stack;
- signal trampolines unwind, mandatory for the NPTL;
- to avoid contex-switch overhead frequently used system calls can be
  implemented in the vDSO: for now gettimeofday, clock_gettime.

The first two have been implemented, so add the implementation of system
calls.

System calls implemenation based on a native timekeeping code with some
limitations:
- ifunc can't be used, as vDSO r/o mapped to the process VA and rtld
  can't relocate symbols;
- reading HPET memory is not implemented for now (TODO).

In case on any error vDSO system calls fallback to the kernel system
calls. For unimplemented vDSO system calls added prototypes which call
corresponding kernel system call.

Tested by:		trasz (arm64)
Differential revision:  https://reviews.freebsd.org/D30900
MFC after:              2 weeks





The vDSO (virtual dynamic shared object) is a small shared library that the
kernel maps R/O into the address space of all Linux processes on image
activation. The vDSO is a fully formed ELF image, shared by all processes
with the same ABI, has no process private data.

The primary purpose of the vDSO:
- non-executable stack, signal trampolines not copied to the stack;
- signal trampolines unwind, mandatory for the NPTL;
- to avoid contex-switch overhead frequently used system calls can be
  implemented in the vDSO: for now gettimeofday, clock_gettime.

The first two have been implemented, so add the implementation of system
calls.

System calls implemenation based on a native timekeeping code with some
limitations:
- ifunc can't be used, as vDSO r/o mapped to the process VA and rtld
  can't relocate symbols;
- reading HPET memory is not implemented for now (TODO).

In case on any error vDSO system calls fallback to the kernel system
calls. For unimplemented vDSO system calls added prototypes which call
corresponding kernel system call.

Tested by:		trasz (arm64)
Differential revision:  https://reviews.freebsd.org/D30900
MFC after:              2 weeks







linux: Unmap the VDSO page when unloading
2021-02-16T14:40:02+00:00

Mark Johnston
markj@FreeBSD.org

2021-02-16T14:30:21+00:00

0fc8a796722846d0d676548aa0f5cc660199db73

linux_shared_page_init() creates an object and grabs and maps a single
page to back the VDSO.  When destroying the VDSO object, we failed to
destroy the mapping and free KVA.  Fix this.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D28696





linux_shared_page_init() creates an object and grabs and maps a single
page to back the VDSO.  When destroying the VDSO object, we failed to
destroy the mapping and free KVA.  Fix this.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D28696







compat: clean up empty lines in .c and .h files
2020-09-01T21:24:33+00:00

Mateusz Guzik
mjg@FreeBSD.org

2020-09-01T21:24:33+00:00

1a180032407ba2dabd02e39c508fe232a9ef66ba












Fix the last few cases that grab without busy or valid.  The grab functions must
2019-12-02T22:38:25+00:00

Jeff Roberson
jeff@FreeBSD.org

2019-12-02T22:38:25+00:00

4504268a1b3cc208ac7fddfae567217aa1f2b68d

return the page in some held state for consistency elsewhere.

Reviewed by:	alc, kib, markj
Differential Revision:	https://reviews.freebsd.org/D22610





return the page in some held state for consistency elsewhere.

Reviewed by:	alc, kib, markj
Differential Revision:	https://reviews.freebsd.org/D22610