MFC r348112:
Fix PPC64 kernel build with clang8 + lld8

This patch fixes the following lld link errors:

- unsupported dynamic relocations on read-only sections
- out-of-range TOC references

Submitt

MFC r348112:
Fix PPC64 kernel build with clang8 + lld8

This patch fixes the following lld link errors:

- unsupported dynamic relocations on read-only sections
- out-of-range TOC references

Submitted by: git_bdragon.rtk0.net
Reviewed by: jhibbits, luporl
Differential Revision: https://reviews.freebsd.org/D19352

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powerpc64: Align frequently used/exclusive data on cacheline boundaries

This is effectively a merge from amd64 of r312888, r323235, and r333486.

I've been running this on my POWER9 Talos for some t

powerpc64: Align frequently used/exclusive data on cacheline boundaries

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

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Add support for 64-bit PowerPC kernels to be directly loaded by kexec, which
is used as the bootloader on a number of PPC64 platforms. This involves the
following pieces:
- Making the first instructi

Add support for 64-bit PowerPC kernels to be directly loaded by kexec, which
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

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Make __startkernel line up with KERNBASE, so that the math to compute the
applied relocation offset in link_elf.c works as intended. We may want to
revisit how that works in future, for example by ha

Make __startkernel line up with KERNBASE, so that the math to compute the
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

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Avoid emitting a PT_INTERP section for powerpc64 kernels and arrange for
the first instruction to be at the start of the text segment. This allows
the kernel to be booted correctly by stock kexec-lit

Avoid emitting a PT_INTERP section for powerpc64 kernels and arrange for
the first instruction to be at the start of the text segment. This allows
the kernel to be booted correctly by stock kexec-lite.

MFC after: 2 weeks

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remove CONSTRUCTORS from kernel linker scripts

The linker script CONSTRUCTORS keyword is only meaningful "when linking
object file formats which do not support arbitrary sections, such as
ECOFF and

remove CONSTRUCTORS from kernel linker scripts

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

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Fix build with new binutils. This gets a working kernel with GCC 5.2 and
binutils 2.24. Without this, the self-relocation code in locore64.S was
failing due to a misaligned TOC section.

MFC after: 2

Fix build with new binutils. This gets a working kernel with GCC 5.2 and
binutils 2.24. Without this, the self-relocation code in locore64.S was
failing due to a misaligned TOC section.

MFC after: 2 weeks

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Refactor PowerPC (especially AIM) init sequence to be less baroque.

MFC after: 2 months

Rename elf*-powerpc into elf*-powerpc-freebsd in binutils

The powerpc support was the only supported architecture not prepending the elf format name
with "-freebsd" in base this change makes it cons

Rename elf*-powerpc into elf*-powerpc-freebsd in binutils

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

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Add the .opd section, this is helps booting a profiled kernel.
Adjust the OUTPUT_ARCH and use the builtin ALIGN() to adjust the data segment.

In fact, we don't need any of these __DYNAMIC. it is a.out leftover and commented out.

Add powerpc64 kernel ldscript.