After our migration (of certain architectures) to lld the kernel is built
with a unique build-ID. Make it available via a sysctl and uname(1) to
allow the user to identify their running kernel.
Submitted by: Ali Mashtizadeh <ali_mashtizadeh.com>
MFC after: 2 weeks
Relnotes: Yes
Event: Waterloo Hackathon 2019
Differential Revision: https://reviews.freebsd.org/D20326
Summary:
kexec-lite cannot currently handle multiple PT_LOAD segments. In some
cases the compiler generates multiple PT_LOAD segments for an unknown
reason, causing boot to fail from kexec-lite.
Submitted by: Brandon Bergren (older version)
Differential Revision: https://reviews.freebsd.org/D19574
This is effectively a merge from amd64 of r312888, r323235, and r333486.
I've been running this on my POWER9 Talos for some time now with no ill
effects.
Suggested by: mjg
is used as the bootloader on a number of PPC64 platforms. This involves the
following pieces:
- Making the first instruction a valid kernel entry point, since kexec
ignores the ELF entry value. This requires a separate section and linker
magic to prevent the linker from filling the beginning of the section
with stubs.
- Adding an entry point at 0x60 past the first instruction for systems
lacking firmware CPU shutdown support (notably PS3).
- Linker script changes to support the above.
MFC after: 1 month
applied relocation offset in link_elf.c works as intended. We may want to
revisit how that works in future, for example by having elf_reloc_self()
actually store the numbers it is using rather than computing them later,
but this fixes symbol lookup after r326203.
Reported by: andreast@
Pointy hat to: me
The linker script CONSTRUCTORS keyword is only meaningful "when linking
object file formats which do not support arbitrary sections, such as
ECOFF and XCOFF"[1] and is ignored for other object file formats.
LLVM's lld does not yet accept (and ignore) CONSTRUCTORS, so just remove
CONSTRUCTORS from the linker scripts as it has no effect.
[1] https://sourceware.org/binutils/docs/ld/Output-Section-Keywords.html
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D7343
The powerpc support was the only supported architecture not prepending the elf format name
with "-freebsd" in base this change makes it consistent with other architectures.
On newer version of binutils the powerpc format is also prepended with "-freebsd".
Also modify the kernel ldscripts in that regards.
As a result it is now possible cross build the kernel on powerpc using newer binutils
Differential Revision: https://reviews.freebsd.org/D926
Differential Revision: https://reviews.freebsd.org/D928
