From 7a5f9ea3bb8ff78bd93eb2cee9b8be876e745346 Mon Sep 17 00:00:00 2001 From: Jens Remus Date: Tue, 1 Oct 2024 17:36:17 +0200 Subject: [PATCH 22/27] pc-bios/s390-ccw: Don't generate TEXTRELs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Thomas Huth RH-MergeRequest: 277: Full boot order support for s390x [CentOS 9] RH-Jira: RHEL-11424 RH-Acked-by: Cédric Le Goater RH-Acked-by: Miroslav Rezanina RH-Commit: [22/23] 8d8b2959be6c798f24e1991252fe6c680a6c6025 (thuth/qemu-kvm-cs9) Commit 7cd50cbe4ca3 ("pc-bios/s390-ccw: Don't use __bss_start with the "larl" instruction") introduced the address constant bss_start_literal for __bss_start in the .text section, which introduced a relocation in code (i.e. TEXTREL). The dedicated constant is required, as __bss_start may not necessarily be aligned on a 2-byte boundary (see subject commit for details). Move the constant to the .data section to get rid of the relocation in the .text section. Add the linker option -z text to prevent TEXTRELs to get introduced in the future. Note that the R_390_RELATIVE relocations are taken care of by function glue() in include/hw/elf_ops.h.inc introduced by commit 5dce07e1cb67 ("elf-loader: Provide the possibility to relocate s390 ELF files"). Reported-by: Marc Hartmayer Signed-off-by: Jens Remus Reviewed-by: Marc Hartmayer Message-ID: <20241001153618.17791-3-mhartmay@linux.ibm.com> Reviewed-by: Thomas Huth Signed-off-by: Thomas Huth (cherry picked from commit 3259b4424a85d9cdfd1a33ed6030a6c51c1b9b8b) --- pc-bios/s390-ccw/Makefile | 2 +- pc-bios/s390-ccw/start.S | 7 +++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile index db9e8f0892..38254e22df 100644 --- a/pc-bios/s390-ccw/Makefile +++ b/pc-bios/s390-ccw/Makefile @@ -46,7 +46,7 @@ EXTRA_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables EXTRA_CFLAGS += -msoft-float EXTRA_CFLAGS += -std=gnu99 EXTRA_CFLAGS += $(LIBC_INC) $(LIBNET_INC) -LDFLAGS += -Wl,-pie -nostdlib -z noexecstack +LDFLAGS += -Wl,-pie -nostdlib -z noexecstack -z text cc-test = $(CC) -Werror $1 -c -o /dev/null -xc /dev/null >/dev/null 2>/dev/null cc-option = if $(call cc-test, $1); then \ diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S index 576fc12c06..b70213e412 100644 --- a/pc-bios/s390-ccw/start.S +++ b/pc-bios/s390-ccw/start.S @@ -113,8 +113,6 @@ io_new_code: br %r14 .balign 8 -bss_start_literal: - .quad __bss_start disabled_wait_psw: .quad 0x0002000180000000,0x0000000000000000 enabled_wait_psw: @@ -124,6 +122,11 @@ external_new_mask: io_new_mask: .quad 0x0000000180000000 +.data + .balign 8 +bss_start_literal: + .quad __bss_start + .bss .balign 8 stack: -- 2.39.3