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arch/mips: add support for MIPS32 FP mode

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MIPS32 support different FP modes (32,xx,64), so give the user the
opportunity to choose between them. That will cause host-gcc to be built
using the --with-fp-32=[32|xx|64] configure option. Also the
-mfp[32|xx|64] gcc option will be added to TARGET_CFLAGS and to the
toolchain wrapper.

FP mode option shouldn't be used for soft-float, so we add logic in the
toolchain wrapper if -msoft-float is among the arguments in order to not
append the -fp[[32|xx|64] option, otherwise the compilation may fail.

Information about FP modes here:

- https://sourceware.org/binutils/docs/as/MIPS-Options.html
- https://dmz-portal.imgtec.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking#5._Generating_modeless_code

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Vicente Olivert Riera
2017-06-28 16:17:11 +01:00
committed by Thomas Petazzoni
parent 2d8f3fc430
commit 9a0a0a976b
5 changed files with 53 additions and 0 deletions
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5
toolchain/toolchain-external/pkg-toolchain-external.mk
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@@ -155,6 +155,7 @@ endif
CC_TARGET_ARCH_ := $(call qstrip,$(BR2_GCC_TARGET_ARCH))
CC_TARGET_ABI_ := $(call qstrip,$(BR2_GCC_TARGET_ABI))
CC_TARGET_NAN_ := $(call qstrip,$(BR2_GCC_TARGET_NAN))
CC_TARGET_FP32_MODE_ := $(call qstrip,$(BR2_GCC_TARGET_FP32_MODE))
CC_TARGET_FPU_ := $(call qstrip,$(BR2_GCC_TARGET_FPU))
CC_TARGET_FLOAT_ABI_ := $(call qstrip,$(BR2_GCC_TARGET_FLOAT_ABI))
CC_TARGET_MODE_ := $(call qstrip,$(BR2_GCC_TARGET_MODE))
@@ -181,6 +182,10 @@ ifneq ($(CC_TARGET_NAN_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mnan=$(CC_TARGET_NAN_)
TOOLCHAIN_EXTERNAL_TOOLCHAIN_WRAPPER_ARGS += -DBR_NAN='"$(CC_TARGET_NAN_)"'
endif
ifneq ($(CC_TARGET_FP32_MODE_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mfp$(CC_TARGET_FP32_MODE_)
TOOLCHAIN_EXTERNAL_TOOLCHAIN_WRAPPER_ARGS += -DBR_FP32_MODE='"$(CC_TARGET_FP32_MODE_)"'
endif
ifneq ($(CC_TARGET_FPU_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mfpu=$(CC_TARGET_FPU_)
TOOLCHAIN_EXTERNAL_TOOLCHAIN_WRAPPER_ARGS += -DBR_FPU='"$(CC_TARGET_FPU_)"'