diff options
Diffstat (limited to 'Makefile.main')
| -rw-r--r-- | Makefile.main | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Makefile.main b/Makefile.main index 12aa253..bf0fcfa 100644 --- a/Makefile.main +++ b/Makefile.main @@ -96,7 +96,14 @@ endif CFLAGS := -fno-strict-aliasing -pie -fpie -fno-pic -m64 -fno-asynchronous-unwind-tables CFLAGS += -mcpu=power8 CFLAGS += -Wl,--oformat,elf64-powerpc -ggdb -CFLAGS += $(call try-cflag,$(CC),-ffixed-r13) +# r13,r14,r15 are preserved for OS to use as fixed registers. +# These could be saved and restored in and out of skiboot, but it's more +# robust to avoid touching them. +CFLAGS += -ffixed-r13 +CFLAGS += -ffixed-r14 +CFLAGS += -ffixed-r15 +# r16 is skiboot's per-CPU data pointer. +CFLAGS += -ffixed-r16 CFLAGS += $(call try-cflag,$(CC),-std=gnu11) ifeq ($(LITTLE_ENDIAN),1) @@ -127,7 +134,7 @@ endif # Check if the new parametrized stack protector option is supported # by gcc, otherwise disable stack protector -STACK_PROT_CFLAGS := -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 +STACK_PROT_CFLAGS := -mstack-protector-guard=tls -mstack-protector-guard-reg=r16 STACK_PROT_CFLAGS += -mstack-protector-guard-offset=0 HAS_STACK_PROT := $(call test_cflag,$(CC),$(STACK_PROT_CFLAGS)) |