On Tue, 2023-06-27 at 09:47 +0200, Thomas Huth wrote: > 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 using the real start address of the .bss section instead. > > Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2216662 > Reported-by: Miroslav Rezanina <mreza...@redhat.com> > Suggested-by: Nick Clifton <ni...@redhat.com> > Signed-off-by: Thomas Huth <th...@redhat.com> > --- > pc-bios/s390-ccw/start.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Eric Farman <far...@linux.ibm.com>
