From: Janosch Frank <frankja@xxxxxxxxxxxxx> As soon as we use C we need to set the AFP bit in cr0 so we can use all fprs. Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx> Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> --- s390x/snippets/c/cstart.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/s390x/snippets/c/cstart.S b/s390x/snippets/c/cstart.S index aaa5380c..a7d4cd42 100644 --- a/s390x/snippets/c/cstart.S +++ b/s390x/snippets/c/cstart.S @@ -12,6 +12,8 @@ .section .init .globl start start: + larl %r1, initial_cr0 + lctlg %c0, %c0, 0(%r1) /* XOR all registers with themselves to clear them fully. */ .irp i, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 xgr \i,\i @@ -34,3 +36,7 @@ exit: /* For now let's only use cpu 0 in snippets so this will always work. */ xgr %r0, %r0 sigp %r2, %r0, SIGP_STOP + +initial_cr0: + /* enable AFP-register control, so FP regs (+BFP instr) can be used */ + .quad 0x0000000000040000 -- 2.34.1
