From f43312c974eaeb7301cb2638aa4ab05ed7ca4c44 Mon Sep 17 00:00:00 2001 From: Samuel Holland Date: Sat, 21 Aug 2021 19:54:02 -0500 Subject: [PATCH] ARM: Prevent the compiler from using NEON registers For ARMv8-A, NEON is standard, so the compiler can use it even when no special target flags are provided. For example, it can use stores from NEON registers to zero-initialize large structures. GCC 11 decides to do this inside the DRAM init code for the Allwinner H6. However, GCC 11 has a bug where it generates misaligned NEON register stores even with -mstrict-align. Since the MMU is not enabled this early in SPL, the misaligned store causes an exception and breaks booting. Work around this issue by restricting the compiler to using GPRs only, not vector registers. This prevents any future surprises relating to NEON use as well. Signed-off-by: Samuel Holland Acked-by: Andre Przywara --- arch/arm/config.mk | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/config.mk b/arch/arm/config.mk index b684d8b416..b107b1af27 100644 --- a/arch/arm/config.mk +++ b/arch/arm/config.mk @@ -25,6 +25,7 @@ endif PLATFORM_RELFLAGS += -fno-common -ffixed-r9 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \ + $(call cc-option,-mgeneral-regs-only) \ $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) # LLVM support -- 2.39.5