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84 lines
3.0 KiB
84 lines
3.0 KiB
1 month ago
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From 62433cc6df65f10e99dab8b2ec9918b69c3c73ae Mon Sep 17 00:00:00 2001
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From: Jens Remus <jremus@linux.ibm.com>
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Date: Tue, 1 Oct 2024 17:36:17 +0200
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Subject: [PATCH 23/38] pc-bios/s390-ccw: Don't generate TEXTRELs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 278: Full boot order support for s390x [Centos 10]
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RH-Jira: RHEL-58153
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RH-Acked-by: Cédric Le Goater <clg@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [22/23] 57de00e48321faf13f673c6d52fd9d59d9be5c83 (thuth/qemu-kvm-cs9)
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Commit 7cd50cbe4ca3 ("pc-bios/s390-ccw: Don't use __bss_start with the
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"larl" instruction") introduced the address constant bss_start_literal
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for __bss_start in the .text section, which introduced a relocation in
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code (i.e. TEXTREL). The dedicated constant is required, as __bss_start
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may not necessarily be aligned on a 2-byte boundary (see subject commit
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for details).
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Move the constant to the .data section to get rid of the relocation in
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the .text section. Add the linker option -z text to prevent TEXTRELs to
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get introduced in the future.
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Note that the R_390_RELATIVE relocations are taken care of by function
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glue() in include/hw/elf_ops.h.inc introduced by commit 5dce07e1cb67
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("elf-loader: Provide the possibility to relocate s390 ELF files").
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Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Signed-off-by: Jens Remus <jremus@linux.ibm.com>
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Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Message-ID: <20241001153618.17791-3-mhartmay@linux.ibm.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit 3259b4424a85d9cdfd1a33ed6030a6c51c1b9b8b)
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---
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pc-bios/s390-ccw/Makefile | 2 +-
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pc-bios/s390-ccw/start.S | 7 +++++--
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2 files changed, 6 insertions(+), 3 deletions(-)
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diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
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index db9e8f0892..38254e22df 100644
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--- a/pc-bios/s390-ccw/Makefile
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+++ b/pc-bios/s390-ccw/Makefile
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@@ -46,7 +46,7 @@ EXTRA_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
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EXTRA_CFLAGS += -msoft-float
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EXTRA_CFLAGS += -std=gnu99
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EXTRA_CFLAGS += $(LIBC_INC) $(LIBNET_INC)
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-LDFLAGS += -Wl,-pie -nostdlib -z noexecstack
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+LDFLAGS += -Wl,-pie -nostdlib -z noexecstack -z text
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cc-test = $(CC) -Werror $1 -c -o /dev/null -xc /dev/null >/dev/null 2>/dev/null
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cc-option = if $(call cc-test, $1); then \
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diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
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index 576fc12c06..b70213e412 100644
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--- a/pc-bios/s390-ccw/start.S
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+++ b/pc-bios/s390-ccw/start.S
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@@ -113,8 +113,6 @@ io_new_code:
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br %r14
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.balign 8
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-bss_start_literal:
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- .quad __bss_start
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disabled_wait_psw:
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.quad 0x0002000180000000,0x0000000000000000
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enabled_wait_psw:
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@@ -124,6 +122,11 @@ external_new_mask:
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io_new_mask:
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.quad 0x0000000180000000
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+.data
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+ .balign 8
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+bss_start_literal:
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+ .quad __bss_start
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+
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.bss
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.balign 8
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stack:
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--
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2.39.3
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