qemu/pc-bios/s390-ccw
Thomas Huth 7cd50cbe4c pc-bios/s390-ccw: Don't use __bss_start with the "larl" instruction
start.S currently cannot be compiled with Clang 16 and binutils 2.40:

 ld: start.o(.text+0x8): misaligned symbol `__bss_start' (0xc1e5) for
     relocation R_390_PC32DBL

According to the built-in linker script of ld, the symbol __bss_start
can actually point *before* the .bss section and does not need to have
any alignment, so in certain situations (like when using the internal
assembler of Clang), the __bss_start symbol can indeed be unaligned
and thus it is not suitable for being used with the "larl" instruction
that needs an address that is at least aligned to halfwords.
The problem went unnoticed so far since binutils <= 2.39 did not
check the alignment, but starting with binutils 2.40, such unaligned
addresses are now refused.

Fix it by loading the address indirectly instead.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2216662
Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
Suggested-by:  Andreas Krebbel <andreas.krebbel@de.ibm.com>
Message-Id: <20230629104821.194859-8-thuth@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2023-06-29 20:45:12 +02:00
..
bootmap.c pc-bios: Add support for List-Directed IPL from ECKD DASD 2023-03-08 08:57:42 +01:00
bootmap.h pc-bios: Add support for List-Directed IPL from ECKD DASD 2023-03-08 08:57:42 +01:00
bswap.h
cio.c
cio.h pc-bios/s390-ccw: Get rid of the the __u* types 2023-06-29 20:45:12 +02:00
dasd-ipl.c
dasd-ipl.h
helper.h s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00
iplb.h s390x: Fix spelling errors 2022-11-16 10:15:26 +01:00
jump2ipl.c
libc.c
libc.h
main.c pc-bios/s390-ccw: Move the stack array into start.S 2023-06-29 20:45:12 +02:00
Makefile pc-bios/s390-ccw/Makefile: Use -z noexecstack to silence linker warning 2023-06-29 20:45:12 +02:00
menu.c
netboot.mak pc-bios/s390-ccw: Adopt meson style Make output 2022-10-06 11:53:40 +01:00
netmain.c pc-bios/s390-ccw: Move the stack array into start.S 2023-06-29 20:45:12 +02:00
s390-arch.h
s390-ccw.h pc-bios/s390-ccw: Move the stack array into start.S 2023-06-29 20:45:12 +02:00
s390-time.h
sclp.c
sclp.h
scsi.h
start.S pc-bios/s390-ccw: Don't use __bss_start with the "larl" instruction 2023-06-29 20:45:12 +02:00
virtio-blkdev.c s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00
virtio-net.c
virtio-scsi.c s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00
virtio-scsi.h s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00
virtio.c s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00
virtio.h s390-ccw: Getting rid of ulong 2023-06-29 20:43:19 +02:00