Date: Tue, 28 Nov 2017 10:23:49 -0600 From: Justin Hibbits <jrh29@alumni.cwru.edu> To: Nathan Whitehorn <nwhitehorn@freebsd.org> 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: <CAHSQbTBqzUqdWNNhL_DMynWN9ZdY1YtUcyKz0m6uPWDUV0MXtA@mail.gmail.com> In-Reply-To: <5831ba86-742d-7019-e1c9-4b6563d2cdcc@freebsd.org> References: <201711252145.vAPLjpV6051703@repo.freebsd.org> <CAHSQbTA7c9VpZpYcB1%2BuW62yW%2BFoscnV8K9AL9txMKO43wcQpg@mail.gmail.com> <5831ba86-742d-7019-e1c9-4b6563d2cdcc@freebsd.org>
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On Tue, Nov 28, 2017 at 10:13 AM, Nathan Whitehorn <nwhitehorn@freebsd.org> wrote: > > > 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 > This is using base binutils (2.17.50...) I don't know why it's doing this, but readelf shows that file offset 0x0000000000100000 maps to 0xc000000000000000, and it goes from there. - Justin
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