From 0f20e8adcf42d31bc478d6700b625d00a68cb30e Mon Sep 17 00:00:00 2001 From: Vincent Chen <vincent.chen@sifive.com> Date: Wed, 17 Mar 2021 09:16:38 +0800 Subject: firmware: Support position independent execution Enable OpenSBI to support position independent execution. Because the position independent code will cause an additional GOT reference when accessing the global variables, it will reduce performance a bit. Therefore, the position independent execution is disabled by default. Users can through specifying "FW_PIC=y" on the make command to enable this feature. In theory, after enabling position-independent execution, the OpenSBI can run at arbitrary address with appropriate alignment. Therefore, the original relocation mechanism will be skipped. In other words, OpenSBI will directly run at the load address without any code movement. Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index d6f097d..038cc99 100644 --- a/Makefile +++ b/Makefile @@ -210,8 +210,8 @@ CFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA) CFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL) CFLAGS += $(GENFLAGS) CFLAGS += $(platform-cflags-y) -CFLAGS += $(firmware-cflags-y) CFLAGS += -fno-pie -no-pie +CFLAGS += $(firmware-cflags-y) CPPFLAGS += $(GENFLAGS) CPPFLAGS += $(platform-cppflags-y) -- cgit v1.2.3