From patchwork Wed Jun 19 02:29:14 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ed Maste X-Patchwork-Id: 252464 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 70E1D2C033D for ; Wed, 19 Jun 2013 12:30:00 +1000 (EST) Received: from localhost ([::1]:54110 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Up89l-0007zT-9t for incoming@patchwork.ozlabs.org; Tue, 18 Jun 2013 22:29:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42758) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Up89F-0007vE-Qv for qemu-devel@nongnu.org; Tue, 18 Jun 2013 22:29:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Up897-0001jA-LF for qemu-devel@nongnu.org; Tue, 18 Jun 2013 22:29:25 -0400 Received: from [216.171.111.232] (port=42117 helo=freebsd.org) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Up897-0001in-CR for qemu-devel@nongnu.org; Tue, 18 Jun 2013 22:29:17 -0400 Received: from emaste (uid 1001) (envelope-from emaste@freebsd.org) id 9cd80 by freebsd.org (DragonFly Mail Agent 1); Tue, 18 Jun 2013 22:29:14 -0400 From: Ed Maste To: qemu-devel@nongnu.org Date: Tue, 18 Jun 2013 22:29:14 -0400 Message-Id: <1371608954-86331-1-git-send-email-emaste@freebsd.org> X-Mailer: git-send-email 1.7.11.5 X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 216.171.111.232 Cc: Ed Maste Subject: [Qemu-devel] [RFT PATCH] configure: Simplify alternate .text segment X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org For bsd-user and linux-user emulation modes QEMU is linked at an alternate .text segment address, so that it's out of the way of the guest executable. Instead of including modified linker scripts for each arch, just set the address with -Ttext-segment if that is supported, or by using sed to edit the default linker script if not. Note that ldscripts/alpha.ld was already unused prior to this change, as it was handled by the "default placement of the application is fine" case. Signed-off-by: Ed Maste --- I'm posting this patch for review, comments, and testing at the moment, and would like to obtain test coverage on as many architectures as possible to gain confidence that it's suitable. To validate the patch, build with bsd-user or linux-user enabled and compare the result of 'readelf -l' on one of the QEMU binaries with and without the patch. configure | 35 +++++--- ldscripts/alpha.ld | 127 --------------------------- ldscripts/arm.ld | 153 --------------------------------- ldscripts/hppa.ld | 211 --------------------------------------------- ldscripts/i386.ld | 153 --------------------------------- ldscripts/ia64.ld | 209 --------------------------------------------- ldscripts/m68k.ld | 175 ------------------------------------- ldscripts/mips.ld | 222 ----------------------------------------------- ldscripts/ppc.ld | 237 --------------------------------------------------- ldscripts/ppc64.ld | 230 ------------------------------------------------- ldscripts/s390.ld | 201 ------------------------------------------- ldscripts/sparc.ld | 150 -------------------------------- ldscripts/sparc64.ld | 138 ------------------------------ ldscripts/x86_64.ld | 180 -------------------------------------- 14 files changed, 22 insertions(+), 2399 deletions(-) delete mode 100644 ldscripts/alpha.ld delete mode 100644 ldscripts/arm.ld delete mode 100644 ldscripts/hppa.ld delete mode 100644 ldscripts/i386.ld delete mode 100644 ldscripts/ia64.ld delete mode 100644 ldscripts/m68k.ld delete mode 100644 ldscripts/mips.ld delete mode 100644 ldscripts/ppc.ld delete mode 100644 ldscripts/ppc64.ld delete mode 100644 ldscripts/s390.ld delete mode 100644 ldscripts/sparc.ld delete mode 100644 ldscripts/sparc64.ld delete mode 100644 ldscripts/x86_64.ld diff --git a/configure b/configure index ad32f87..9d46354 100755 --- a/configure +++ b/configure @@ -4072,9 +4072,6 @@ if test "$gcov" = "yes" ; then echo "GCOV=$gcov_tool" >> $config_host_mak fi -# generate list of library paths for linker script -$ld --verbose -v 2> /dev/null | grep SEARCH_DIR > config-host.ld - # use included Linux headers if test "$linux" = "yes" ; then mkdir -p linux-headers @@ -4437,21 +4434,33 @@ if test "$gprof" = "yes" ; then fi fi -if test "$ARCH" = "tci"; then - linker_script="" -else - linker_script="-Wl,-T../config-host.ld -Wl,-T,\$(SRC_PATH)/ldscripts/\$(ARCH).ld" -fi - if test "$target_linux_user" = "yes" -o "$target_bsd_user" = "yes" ; then + textseg_addr= case "$ARCH" in - alpha | s390x | aarch64) - # The default placement of the application is fine. + arm | hppa | i386 | ia64 | m68k | ppc | ppc64 | s390 | sparc | sparc64 | x86_64) + default_textseg_addr=0x400000 + textseg_addr=0x60000000 ;; - *) - ldflags="$linker_script $ldflags" + mips) + default_textseg_addr=0x120000000 + textseg_addr=0x400000 ;; esac + if [ -n "$textseg_addr" ]; then + try_ldflags="-Ttext-segment=$textseg_addr" + if $ld $try_ldflags /dev/null >/dev/null 2>&1; then + ldflags="$ldflags $try_ldflags" + else + # In case ld does not support -Ttext-segment, edit the default linker + # script via sed to set the .text start addr. This is needed on FreeBSD + # at least. + $ld --verbose 2>/dev/null | sed \ + -e '1,/==================================================/d' \ + -e '/==================================================/,$d' \ + -e "s/$default_textseg_addr/$textseg_addr/g" > config-host.ld + ldflags="$ldflags -Wl,-T../config-host.ld" + fi + fi fi echo "LDFLAGS+=$ldflags" >> $config_target_mak diff --git a/ldscripts/alpha.ld b/ldscripts/alpha.ld deleted file mode 100644 index 906d76b..0000000 --- a/ldscripts/alpha.ld +++ /dev/null @@ -1,127 +0,0 @@ -OUTPUT_FORMAT("elf64-alpha", "elf64-alpha", - "elf64-alpha") -OUTPUT_ARCH(alpha) -ENTRY(__start) -SECTIONS -{ - /* Read-only sections, merged into text segment: */ - . = 0x60000000 + SIZEOF_HEADERS; - .interp : { *(.interp) } - .hash : { *(.hash) } - .dynsym : { *(.dynsym) } - .dynstr : { *(.dynstr) } - .gnu.version : { *(.gnu.version) } - .gnu.version_d : { *(.gnu.version_d) } - .gnu.version_r : { *(.gnu.version_r) } - .rel.text : - { *(.rel.text) *(.rel.gnu.linkonce.t*) } - .rela.text : - { *(.rela.text) *(.rela.gnu.linkonce.t*) } - .rel.data : - { *(.rel.data) *(.rel.gnu.linkonce.d*) } - .rela.data : - { *(.rela.data) *(.rela.gnu.linkonce.d*) } - .rel.rodata : - { *(.rel.rodata) *(.rel.gnu.linkonce.r*) } - .rela.rodata : - { *(.rela.rodata) *(.rela.gnu.linkonce.r*) } - .rel.got : { *(.rel.got) } - .rela.got : { *(.rela.got) } - .rel.ctors : { *(.rel.ctors) } - .rela.ctors : { *(.rela.ctors) } - .rel.dtors : { *(.rel.dtors) } - .rela.dtors : { *(.rela.dtors) } - .rel.init : { *(.rel.init) } - .rela.init : { *(.rela.init) } - .rel.fini : { *(.rel.fini) } - .rela.fini : { *(.rela.fini) } - .rel.bss : { *(.rel.bss) } - .rela.bss : { *(.rela.bss) } - .rel.plt : { *(.rel.plt) } - .rela.plt : { *(.rela.plt) } - .init : { *(.init) } =0x47ff041f - .text : - { - *(.text) - /* .gnu.warning sections are handled specially by elf32.em. */ - *(.gnu.warning) - *(.gnu.linkonce.t*) - } =0x47ff041f - _etext = .; - PROVIDE (etext = .); - .fini : { *(.fini) } =0x47ff041f - .rodata : { *(.rodata) *(.gnu.linkonce.r*) } - .rodata1 : { *(.rodata1) } - .reginfo : { *(.reginfo) } - /* Adjust the address for the data segment. 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