src/sys/amd64/linux/linux_locore.asm, branch stable/14 FreeBSD source tree 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/
linux(4): Fix stack unwinding across signal frame on x86_64 2023-05-28T14:07:28+00:00 Dmitry Chagin dchagin@FreeBSD.org 2023-05-28T14:07:28+00:00 78c2e58fa5b0aa4518d79d8155c0513b9a04f531 Get rid of using register numbers which is undefined in libunwind on x86_64. Differential Revision: https://reviews.freebsd.org/D40156 MFC after: 1 month 
Get rid of using register numbers which is undefined in libunwind
on x86_64.

Differential Revision:	https://reviews.freebsd.org/D40156
MFC after:		1 month
spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD 2023-05-12T16:44:03+00:00 Warner Losh imp@FreeBSD.org 2023-05-10T15:40:58+00:00 4d846d260e2b9a3d4d0a701462568268cbfe7a5b The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix 
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:		pfg
MFC After:		3 days
Sponsored by:		Netflix
linux(4): Retire handmade DWARF annotations from signal trampolines 2022-05-15T18:08:12+00:00 Dmitry Chagin dchagin@FreeBSD.org 2022-05-15T18:08:12+00:00 8f9635dc99f571a0ae4e613b9a0439e68da7b160 The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the vdso. Modern glibc's sigaction sets the sa_restorer field of sigaction to the corresponding vdso __sigreturn, and sets the SA_RESTORER. Our signal trampolines uses the FreeBSD-way to call a signal handler, so does not use the sigaction's sa_restorer. However, as glibc's runtime linker depends on the existment of the vdso __sigreturn symbols, for all Linuxulators was added separate trampolines named __sigcode with DWARF anotations and left separate __sigreturn methods, which are exported. MFC after: 2 weeks 
The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the
vdso. Modern glibc's sigaction sets the sa_restorer field of sigaction
to the corresponding vdso __sigreturn, and sets the SA_RESTORER.
Our signal trampolines uses the FreeBSD-way to call a signal handler,
so does not use the sigaction's sa_restorer.

However, as glibc's runtime linker depends on the existment of the vdso
__sigreturn symbols, for all Linuxulators was added separate trampolines
named __sigcode with DWARF anotations and left separate __sigreturn
methods, which are exported.

MFC after:		2 weeks
linux(4): Cleanup signal trampolines 2022-05-15T18:00:05+00:00 Dmitry Chagin dchagin@FreeBSD.org 2022-05-15T18:00:05+00:00 ba279bcd6d75aa236bcb9ccf11aeb6f51a2f8514 This is the first stage of a signal trampolines refactoring. From trampolines retired emulation of the 'call' instruction, which is replaced by direct call of a signal handler. The signal handler address is in the register. The previous trampoline implemenatation used semi-Linux-way to call a signal handler via the 'jmp' instruction. Wherefore the trampoline emulated a 'call' instruction to into the stack the return address for signal handler's 'ret' instruction. Wherefore handmade DWARD annotations was used. While here rephrased and removed excessive comments. MFC after: 2 weeks 
This is the first stage of a signal trampolines refactoring.

From trampolines retired emulation of the 'call' instruction, which is
replaced by direct call of a signal handler. The signal handler address
is in the register.

The previous trampoline implemenatation used semi-Linux-way to call
a signal handler via the 'jmp' instruction. Wherefore the trampoline
emulated a 'call' instruction to into the stack the return address for
signal handler's 'ret' instruction.  Wherefore handmade DWARD annotations
was used.

While here rephrased and removed excessive comments.

MFC after:		2 weeks
linux(4): Remove function prototypes from the vDSO. 2021-07-20T06:52:08+00:00 Dmitry Chagin dchagin@FreeBSD.org 2021-07-20T06:52:08+00:00 815165be201e49d118e93dec6c257cd63b69d158 In preparation for vDSO code revision get rid of incomplete vDSO methods from locore, but leave .note.Linux section commented out. .note.Linux section is used by glibc rtld to get the kernel version, that saves one system call call. I'll try to implement it later, if figure out how to use it with jails. MFC after: 2 weeks 
In preparation for vDSO code revision get rid of incomplete vDSO methods
from locore, but leave .note.Linux section commented out.
.note.Linux section is used by glibc rtld to get the kernel version, that
saves one system call call. I'll try to implement it later, if figure out
how to use it with jails.

MFC after:	2 weeks
x86: remove gcov kernel support 2021-04-02T12:41:51+00:00 Konstantin Belousov kib@FreeBSD.org 2021-03-31T21:04:55+00:00 aa3ea612be3659881392251e91912682b038ce78 Reviewed by: jhb Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D29529 
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D29529
linuxulator: rename linux_locore.s to .asm 2019-07-30T17:18:31+00:00 Ed Maste emaste@FreeBSD.org 2019-07-30T17:18:31+00:00 305b9efefc266b5b502b6d6d660174fa3e9c788e It is assembled using "${CC} -x assembler-with-cpp", which by convention (bsd.suffixes.mk) uses the .asm extension. This is a portion of the review referenced below (D18344). That review also renamed linux_support.s to .S, but that is a functional change (using the compiler's integrated assembler instead of as) and will be revisited separately. MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18344 
It is assembled using "${CC} -x assembler-with-cpp", which by convention
(bsd.suffixes.mk) uses the .asm extension.

This is a portion of the review referenced below (D18344).  That review
also renamed linux_support.s to .S, but that is a functional change
(using the compiler's integrated assembler instead of as) and will be
revisited separately.

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D18344