src/sys/compat/linux/linux_vdso.h, branch releng/15.0 FreeBSD source tree linux(4): Remove include of sys/types.h from linux_vdso.h 2023-08-18T12:58:32+00:00 Dmitry Chagin dchagin@FreeBSD.org 2023-08-18T12:58:32+00:00 110be11ac9913fb5f26b1456359d25b5740dd615 Due to sys/param.h includes sys/types.h and the fact that the sys/param.h is included everywhere where linux_vdso.h is needed. 
Due to sys/param.h includes sys/types.h and the fact that the sys/param.h
is included everywhere where linux_vdso.h is needed.
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 $FreeBSD$: two-line .h pattern
2023-08-16T17:54:11+00:00

Warner Losh
imp@FreeBSD.org

2023-08-16T17:54:11+00:00

95ee2897e98f5d444f26ed2334cc7c439f9c16c6

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/





Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/







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







Avoid using [LINUX_]SHAREDPAGE constant directly in the vdso code.
2017-07-30T21:24:20+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2017-07-30T21:24:20+00:00

c151945c8645ef2c44d4f06ded23f9c43ea48d98

This is needed for https://reviews.freebsd.org/D11780.

Reported by:	kib@





This is needed for https://reviews.freebsd.org/D11780.

Reported by:	kib@







Add 64 bit support to the vdso.
2015-05-24T15:45:36+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2015-05-24T15:45:36+00:00

36204c301698ea648796bfc50ff61c17b75d7f9e

Differential Revision:	https://reviews.freebsd.org/D1069
Reviewed by:	trasz





Differential Revision:	https://reviews.freebsd.org/D1069
Reviewed by:	trasz







Implement vdso - virtual dynamic shared object. Through vdso Linux
2015-05-24T15:28:17+00:00

Dmitry Chagin
dchagin@FreeBSD.org

2015-05-24T15:28:17+00:00

bdc379344aee7b07ea84d4da61a4f228b72f8079

exposes functions from kernel with proper DWARF CFI information so that
it becomes easier to unwind through them.
Using vdso is a mandatory for a thread cancelation && cleanup
on a modern glibc.

Differential Revision:	https://reviews.freebsd.org/D1060





exposes functions from kernel with proper DWARF CFI information so that
it becomes easier to unwind through them.
Using vdso is a mandatory for a thread cancelation && cleanup
on a modern glibc.

Differential Revision:	https://reviews.freebsd.org/D1060