Date: Tue, 28 Nov 2017 08:13:53 -0800 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Justin Hibbits <jrh29@alumni.cwru.edu> Cc: src-committers <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r326203 - head/sys/conf Message-ID: <5831ba86-742d-7019-e1c9-4b6563d2cdcc@freebsd.org> In-Reply-To: <CAHSQbTA7c9VpZpYcB1%2BuW62yW%2BFoscnV8K9AL9txMKO43wcQpg@mail.gmail.com> References: <201711252145.vAPLjpV6051703@repo.freebsd.org> <CAHSQbTA7c9VpZpYcB1%2BuW62yW%2BFoscnV8K9AL9txMKO43wcQpg@mail.gmail.com>
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On 11/28/17 07:27, Justin Hibbits wrote: > On Sat, Nov 25, 2017 at 3:45 PM, Nathan Whitehorn > <nwhitehorn@freebsd.org> wrote: >> Author: nwhitehorn >> Date: Sat Nov 25 21:45:51 2017 >> New Revision: 326203 >> URL: https://svnweb.freebsd.org/changeset/base/326203 >> >> Log: >> 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 >> >> Modified: >> head/sys/conf/ldscript.powerpc64 >> >> Modified: head/sys/conf/ldscript.powerpc64 >> ============================================================================== >> --- head/sys/conf/ldscript.powerpc64 Sat Nov 25 21:44:23 2017 (r326202) >> +++ head/sys/conf/ldscript.powerpc64 Sat Nov 25 21:45:51 2017 (r326203) >> @@ -10,7 +10,7 @@ SECTIONS >> { >> /* Read-only sections, merged into text segment: */ >> >> - . = kernbase + SIZEOF_HEADERS; >> + . = kernbase; >> PROVIDE (begin = . - SIZEOF_HEADERS); >> >> .text : >> @@ -24,7 +24,10 @@ SECTIONS >> _etext = .; >> PROVIDE (etext = .); >> >> - .interp : { *(.interp) } >> + /* Do not emit PT_INTERP section, which confuses some loaders (kexec-lite) */ >> + .interpX : { *(.interp) } : NONE >> + /DISCARD/ : { *(.interp) } >> + >> .hash : { *(.hash) } >> .dynsym : { *(.dynsym) } >> .dynstr : { *(.dynstr) } >> > This broke powerpc64 Book-E kernels. It now puts a 1MB blank space > ahead of the kernel data (ELF header + 1MB - sizeof(header) of 0's), > meaning that now the kernel needs to be loaded by uboot 1MB earlier in > memory, rather than straight on the 64MB boundary as it has been. > > - Justin > How on Earth? It doesn't do that on my system. What binutils are you using? -Nathan
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