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Makefile: Set ABI, ISA and Code Model in top-level make

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This patch introduces following optional PLATFORM options:
PLATFORM_RISCV_XLEN -> RISC-V register width
PLATFORM_RISCV_ABI -> RISC-V GCC ABI
PLATFORM_RISCV_ISA -> RISC-V GCC ISA string
PLATFORM_RISCV_CODE_MODEL -> RISC-V GCC Code Model

If the above options are not provided by platform config.mk
or by command-line parameters then:
1. PLATFORM_RISCV_XLEN will be determined using toolchain
capability
2. PLATFORM_RISCV_ABI, PLATFORM_RISCV_ISA, and
PLATFORM_RISCV_CODE_MODEL is set to value best suited for
generic libsbi.a

As a result of these optional PLATFORM options, the
platform-cflags-y and platform-asflags-y is further
simplified for platform config.mk.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2019-02-08 12:47:01 +05:30
committed by Anup Patel
parent 84169e2e69
commit c5467fce46
6 changed files with 46 additions and 25 deletions
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26
Makefile
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@@ -119,10 +119,34 @@ DTC = dtc
# Guess the compillers xlen
OPENSBI_CC_XLEN = `expr substr \`$(CC) -dumpmachine\` 6 2`
# Setup platform XLEN, ABI, ISA and Code Model
ifndef PLATFORM_RISCV_XLEN
ifeq ($(OPENSBI_CC_XLEN), 32)
PLATFORM_RISCV_XLEN = 32
else
PLATFORM_RISCV_XLEN = 64
endif
endif
ifndef PLATFORM_RISCV_ABI
ifeq ($(PLATFORM_RISCV_XLEN), 32)
PLATFORM_RISCV_ABI = ilp$(PLATFORM_RISCV_XLEN)
else
PLATFORM_RISCV_ABI = lp$(PLATFORM_RISCV_XLEN)
endif
endif
ifndef PLATFORM_RISCV_ISA
PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
endif
ifndef PLATFORM_RISCV_CODE_MODEL
PLATFORM_RISCV_CODE_MODEL = medany
endif
# Setup compilation commands flags
CFLAGS = -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2
CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
CFLAGS += -mno-save-restore -mstrict-align
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)
@@ -134,6 +158,8 @@ CPPFLAGS += $(firmware-cppflags-y)
ASFLAGS = -g -Wall -nostdlib -D__ASSEMBLY__
ASFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
ASFLAGS += -mno-save-restore -mstrict-align
ASFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
ASFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
ASFLAGS += $(GENFLAGS)
ASFLAGS += $(platform-asflags-y)
ASFLAGS += $(firmware-asflags-y)