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From 2cc0b085fb82e80d43cc08c8376dff9f9532a72d Mon Sep 17 00:00:00 2001
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From: Sergei Trofimovich <slyfox@gentoo.org>
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Date: Sat, 27 Jan 2018 20:29:05 +0000
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Subject: [PATCH 09/25] gnuefi: preserve .gnu.hash sections (unbreaks elilo on
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IA-64)
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Gentoo has slightly modified linker defaults: --hash-style=gnu
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This means all ELF files in system have '.gnu.hash' section
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but no '.hash' section.
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gnuefi's ldscript did not account for it and as a result
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one symbol 'ImageBase' did not resolve locally for elilo.so
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and caused 'elilo' to fail to load by ia64 EFI:
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Loading.: Gentoo (try new elilo)
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ImageAddress: pointer is outside of image
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ImageAddress: pointer is outside of image
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Those two relocations come from crt0-efi-ia64.S PE32 entry point
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fdescr:
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```
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#define IMAGE_REL_BASED_DIR64<->10
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.section .reloc, "a"
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data4 _start_plabel // Page RVA
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data4 12 // Block Size (2*4+2*2)
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data2 (IMAGE_REL_BASED_DIR64<<12) + 0 // reloc for plabel's entry point
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data2 (IMAGE_REL_BASED_DIR64<<12) + 8 // reloc for plabel's global pointer
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```
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These refer ImageBase.
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The change adds '.gnu.hash' collection (follows existing '.hash'
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collection).
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Tested on IA-64 by successfully booting elilo-3.16.
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Bug: https://bugs.gentoo.org/575300
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Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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---
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README.gnuefi | 8 +++++++-
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gnuefi/elf_ia32_efi.lds | 4 +++-
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gnuefi/elf_ia32_fbsd_efi.lds | 4 +++-
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gnuefi/elf_ia64_efi.lds | 4 +++-
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gnuefi/elf_x86_64_efi.lds | 4 +++-
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gnuefi/elf_x86_64_fbsd_efi.lds | 4 +++-
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6 files changed, 22 insertions(+), 6 deletions(-)
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diff --git a/README.gnuefi b/README.gnuefi
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index a7feec0ba28..512698c28b4 100644
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--- a/README.gnuefi
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+++ b/README.gnuefi
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@@ -231,11 +231,17 @@ and page sized.These eight sections are used to group together the much
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greater number of sections that are typically present in ELF object files.
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Specifically:
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- .hash
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+ .hash (and/or .gnu.hash)
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Collects the ELF .hash info (this section _must_ be the first
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section in order to build a shared object file; the section is
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not actually loaded or used at runtime).
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+ GNU binutils provides a mechanism to generate different hash info
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+ via --hash-style=<sysv|gnu|both> option. In this case output
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+ shared object will contain .hash section, .gnu.hash section or
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+ both. In order to generate correct output linker script preserves
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+ both types of hash sections.
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+
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.text
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Collects all sections containing executable code.
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diff --git a/gnuefi/elf_ia32_efi.lds b/gnuefi/elf_ia32_efi.lds
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index 6cc4ce1b8c7..f27fe5fc6e6 100644
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--- a/gnuefi/elf_ia32_efi.lds
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+++ b/gnuefi/elf_ia32_efi.lds
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@@ -5,7 +5,9 @@ SECTIONS
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{
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. = 0;
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ImageBase = .;
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- .hash : { *(.hash) } /* this MUST come first! */
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+ /* .hash and/or .gnu.hash MUST come first! */
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+ .hash : { *(.hash) }
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+ .gnu.hash : { *(.gnu.hash) }
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. = ALIGN(4096);
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.text :
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{
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diff --git a/gnuefi/elf_ia32_fbsd_efi.lds b/gnuefi/elf_ia32_fbsd_efi.lds
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index 77d6fade1a5..cd309e24f7f 100644
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--- a/gnuefi/elf_ia32_fbsd_efi.lds
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+++ b/gnuefi/elf_ia32_fbsd_efi.lds
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@@ -5,7 +5,9 @@ SECTIONS
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{
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. = 0;
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ImageBase = .;
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- .hash : { *(.hash) } /* this MUST come first! */
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+ /* .hash and/or .gnu.hash MUST come first! */
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+ .hash : { *(.hash) }
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+ .gnu.hash : { *(.gnu.hash) }
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. = ALIGN(4096);
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.text :
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{
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diff --git a/gnuefi/elf_ia64_efi.lds b/gnuefi/elf_ia64_efi.lds
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index baca9623b57..190792a0c94 100644
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--- a/gnuefi/elf_ia64_efi.lds
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+++ b/gnuefi/elf_ia64_efi.lds
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@@ -5,7 +5,9 @@ SECTIONS
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{
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. = 0;
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ImageBase = .;
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- .hash : { *(.hash) } /* this MUST come first! */
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+ /* .hash and/or .gnu.hash MUST come first! */
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+ .hash : { *(.hash) }
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+ .gnu.hash : { *(.gnu.hash) }
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. = ALIGN(4096);
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.text :
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{
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diff --git a/gnuefi/elf_x86_64_efi.lds b/gnuefi/elf_x86_64_efi.lds
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index 942d1f3eff7..7be59023510 100644
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--- a/gnuefi/elf_x86_64_efi.lds
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+++ b/gnuefi/elf_x86_64_efi.lds
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@@ -6,7 +6,9 @@ SECTIONS
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{
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. = 0;
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ImageBase = .;
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- .hash : { *(.hash) } /* this MUST come first! */
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+ /* .hash and/or .gnu.hash MUST come first! */
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+ .hash : { *(.hash) }
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+ .gnu.hash : { *(.gnu.hash) }
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. = ALIGN(4096);
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.eh_frame :
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{
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diff --git a/gnuefi/elf_x86_64_fbsd_efi.lds b/gnuefi/elf_x86_64_fbsd_efi.lds
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index 6fd2031c13b..fe1f3342cae 100644
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--- a/gnuefi/elf_x86_64_fbsd_efi.lds
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+++ b/gnuefi/elf_x86_64_fbsd_efi.lds
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@@ -6,7 +6,9 @@ SECTIONS
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{
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. = 0;
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ImageBase = .;
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- .hash : { *(.hash) } /* this MUST come first! */
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+ /* .hash and/or .gnu.hash MUST come first! */
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+ .hash : { *(.hash) }
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+ .gnu.hash : { *(.gnu.hash) }
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. = ALIGN(4096);
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.eh_frame :
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{
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--
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2.15.0
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