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Makefile: Set ABI, ISA and Code Model in top-level make
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>
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6 changed files with 46 additions and 25 deletions
26
Makefile
26
Makefile
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@ -119,10 +119,34 @@ DTC = dtc
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# Guess the compillers xlen
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OPENSBI_CC_XLEN = `expr substr \`$(CC) -dumpmachine\` 6 2`
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# Setup platform XLEN, ABI, ISA and Code Model
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ifndef PLATFORM_RISCV_XLEN
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ifeq ($(OPENSBI_CC_XLEN), 32)
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PLATFORM_RISCV_XLEN = 32
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else
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PLATFORM_RISCV_XLEN = 64
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endif
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endif
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ifndef PLATFORM_RISCV_ABI
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ifeq ($(PLATFORM_RISCV_XLEN), 32)
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PLATFORM_RISCV_ABI = ilp$(PLATFORM_RISCV_XLEN)
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else
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PLATFORM_RISCV_ABI = lp$(PLATFORM_RISCV_XLEN)
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endif
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endif
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ifndef PLATFORM_RISCV_ISA
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PLATFORM_RISCV_ISA = rv$(PLATFORM_RISCV_XLEN)imafdc
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endif
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ifndef PLATFORM_RISCV_CODE_MODEL
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PLATFORM_RISCV_CODE_MODEL = medany
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endif
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# Setup compilation commands flags
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CFLAGS = -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2
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CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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CFLAGS += -mno-save-restore -mstrict-align
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CFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
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CFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
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CFLAGS += $(GENFLAGS)
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CFLAGS += $(platform-cflags-y)
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CFLAGS += $(firmware-cflags-y)
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@ -134,6 +158,8 @@ CPPFLAGS += $(firmware-cppflags-y)
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ASFLAGS = -g -Wall -nostdlib -D__ASSEMBLY__
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ASFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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ASFLAGS += -mno-save-restore -mstrict-align
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ASFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
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ASFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
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ASFLAGS += $(GENFLAGS)
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ASFLAGS += $(platform-asflags-y)
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ASFLAGS += $(firmware-asflags-y)
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@ -9,8 +9,8 @@
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# Compiler flags
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platform-cppflags-y =
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platform-cflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-asflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-cflags-y =
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platform-asflags-y =
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platform-ldflags-y =
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# Common drivers to enable
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@ -9,8 +9,8 @@
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# Compiler flags
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platform-cppflags-y =
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platform-cflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-asflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-cflags-y =
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platform-asflags-y =
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platform-ldflags-y =
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# Common drivers to enable
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@ -9,17 +9,8 @@
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# Compiler flags
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platform-cppflags-y =
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# If we know the compillers xlen use it below
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ifeq ($(OPENSBI_CC_XLEN), 32)
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platform-cflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
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platform-asflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
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endif
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ifeq ($(OPENSBI_CC_XLEN), 64)
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platform-cflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
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platform-asflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
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endif
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platform-cflags-y += -mcmodel=medany
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platform-asflags-y += -mcmodel=medany
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platform-cflags-y =
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platform-asflags-y =
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platform-ldflags-y =
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# Common drivers to enable
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@ -9,8 +9,8 @@
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# Compiler flags
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platform-cppflags-y =
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platform-cflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-asflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-cflags-y =
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platform-asflags-y =
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platform-ldflags-y =
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# Common drivers to enable
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@ -8,19 +8,23 @@
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platform-cppflags-y =
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# C Compiler and assembler flags.
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# For a 64 bits platform, this will likely be:
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# -mabi=lp64 -march=rv64imafdc -mcmodel=medany
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# For a 32 bits platform, this will likely be:
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# -mabi=lp32 -march=rv32imafdc -mcmodel=medlow
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# You can also use the Makefile variable OPENSBI_CC_XLEN for the xlen
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# See the QEMU virt machine for an example of this
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platform-cflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-asflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany
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platform-cflags-y =
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platform-asflags-y =
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# Linker flags: additional libraries and object files that the platform
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# code needs can be added here
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platform-ldflags-y =
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#
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# Platform RISC-V XLEN, ABI, ISA and Code Model configuration.
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# These are optional parameters but platforms can optionaly provide it.
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# Some of these are guessed based on GCC compiler capabilities
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#
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# PLATFORM_RISCV_XLEN = 64
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# PLATFORM_RISCV_ABI = lp64
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# PLATFORM_RISCV_ISA = rv64imafdc
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# PLATFORM_RISCV_CODE_MODEL = medany
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#
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# OpenSBI implements generic drivers for some common generic hardware. The
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# drivers currently available are the RISC-V Platform Level Interrupt
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