diff options
| author | Alistair Francis <alistair.francis@wdc.com> | 2019-01-17 17:33:47 -0800 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2019-02-08 09:18:46 +0530 |
| commit | 5a91fec1a80939e78e37a0b2bc1d3043dcac23f4 (patch) | |
| tree | aaddc0894f782c361a11ea5d72f2aa9efdff0d56 | |
| parent | b4c72deba98b6398a4c44198553093670d226e2d (diff) | |
platform/qemu/virt: Dynamically calculate xlen
The QEMU virt machine can be either 32 or 66 bit. Don't hard code the
CPU bit length and instead let the compiler determine it.
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
| -rw-r--r-- | Makefile | 3 | ||||
| -rw-r--r-- | platform/qemu/virt/config.mk | 13 | ||||
| -rw-r--r-- | platform/template/config.mk | 2 |
3 files changed, 16 insertions, 2 deletions
@@ -116,6 +116,9 @@ endif AS = $(CC) DTC = dtc +# Guess the compillers xlen +OPENSBI_CC_XLEN = `expr substr \`$(CC) -dumpmachine\` 6 2` + # Setup compilation commands flags CFLAGS = -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2 CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls diff --git a/platform/qemu/virt/config.mk b/platform/qemu/virt/config.mk index 1ee66d0..5931d0e 100644 --- a/platform/qemu/virt/config.mk +++ b/platform/qemu/virt/config.mk @@ -9,8 +9,17 @@ # Compiler flags platform-cppflags-y = -platform-cflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany -platform-asflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany +# If we know the compillers xlen use it below +ifeq ($(OPENSBI_CC_XLEN), 32) + platform-cflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc + platform-asflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc +endif +ifeq ($(OPENSBI_CC_XLEN), 64) + platform-cflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc + platform-asflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc +endif +platform-cflags-y += -mcmodel=medany +platform-asflags-y += -mcmodel=medany platform-ldflags-y = # Common drivers to enable diff --git a/platform/template/config.mk b/platform/template/config.mk index b1457da..21aa6d6 100644 --- a/platform/template/config.mk +++ b/platform/template/config.mk @@ -12,6 +12,8 @@ platform-cppflags-y = # -mabi=lp64 -march=rv64imafdc -mcmodel=medany # For a 32 bits platform, this will likely be: # -mabi=lp32 -march=rv32imafdc -mcmodel=medlow +# You can also use the Makefile variable OPENSBI_CC_XLEN for the xlen +# See the QEMU virt machine for an example of this platform-cflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany platform-asflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany |