src/sys/arm64/linux/linux_sigframe.h, branch stable/13 FreeBSD source tree arm64: Use the Linux sigframe to restore registers 2024-02-19T12:41:40+00:00 Andrew Turner andrew@FreeBSD.org 2023-10-25T09:50:11+00:00 72b242ac15af15bea2c6989bb911d2dd6ab11651 When returning from a Linux signal use the Linux sigframe to find the register values to restore. Remove the FreeBSD ucontext from the stack as it's now unneeded. Reviewed by: dchagin, emaste Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D42360 (cherry picked from commit 070a4ff82a34652d533f9315ae9ad0aa8f1fdeb2) 
When returning from a Linux signal use the Linux sigframe to find the
register values to restore.

Remove the FreeBSD ucontext from the stack as it's now unneeded.

Reviewed by:	dchagin, emaste
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D42360

(cherry picked from commit 070a4ff82a34652d533f9315ae9ad0aa8f1fdeb2)
sys: Remove $FreeBSD$: two-line .h pattern 2023-08-23T17:43:20+00:00 Warner Losh imp@FreeBSD.org 2023-08-22T01:31:02+00:00 f8167e0404dab9ffeaca95853dd237ab7c587f82 Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/ Similar commit in current: (cherry picked from commit 95ee2897e98f) 
Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Similar commit in current:
(cherry picked from commit 95ee2897e98f)
linux(4): Add AT_MINSIGSTKSZ to arm64 port 2022-06-17T19:35:23+00:00 Dmitry Chagin dchagin@FreeBSD.org 2022-05-15T18:12:03+00:00 d30b87879ba43e47d86b57d66a33e3edd3948110 MFC after: 2 weeks (cherry picked from commit 390c9ea029fdd3fb2ce61fc6b48617f0f7cd8754) 
MFC after:	2 weeks

(cherry picked from commit 390c9ea029fdd3fb2ce61fc6b48617f0f7cd8754)
linux(4): Implement signal trampoline for arm64 in a FreeBSD-way 2022-06-17T19:35:22+00:00 Dmitry Chagin dchagin@FreeBSD.org 2022-05-15T18:10:50+00:00 98b737c9f1b4b5f19a648a39e008ca3934c95b85 The implemenation differs from others Linuxulators. For unwinders Linux ucontext_t is stored, however native machine context is used to store/restore process state to avoid code duplication. As DWARF Aarch64 does not define a register number for PC and provides no direct way to encode the PC of the previous frame, CFI cannot describe a signal trampoline frame. So, modified the vdso linker script to discard unused sections. Extensions are not implemented. MFC after: 2 weeks (cherry picked from commit c56480a832354aff995f9d0bc5da4ccf27dfe78a) 
The implemenation differs from others Linuxulators.
For unwinders Linux ucontext_t is stored, however native machine context
is used to store/restore process state to avoid code duplication.

As DWARF Aarch64 does not define a register number for PC and provides no
direct way to encode the PC of the previous frame, CFI cannot describe a
signal trampoline frame. So, modified the vdso linker script to discard
unused sections.

Extensions are not implemented.

MFC after:		2 weeks

(cherry picked from commit c56480a832354aff995f9d0bc5da4ccf27dfe78a)
linux(4): Move sigframe definitions to separate headers 2022-06-17T19:35:20+00:00 Dmitry Chagin dchagin@FreeBSD.org 2022-05-15T18:03:01+00:00 3f3bfb826601d0d5581438c357a5dabd35aef9d2 The signal trampoine-related definitions are used only in the MD part of code, wherefore moved from everywhere used linux.h to separate MD headers. MFC after: 2 weeks (cherry picked from commit 21f246174184742ba8952aeb1dadbf58d48d54b4) 
The signal trampoine-related definitions are used only in the MD part
of code, wherefore moved from everywhere used linux.h to separate MD
headers.

MFC after:		2 weeks

(cherry picked from commit 21f246174184742ba8952aeb1dadbf58d48d54b4)