toolchain: add support for iamcu toolchain
See https://groups.google.com/forum/#!topic/ia32-abi/cn7TM6J_TIg for more details. • Support IA32 without FPU. • Minimum ISA: Pentium ISA without x87 FPU instructions. • Don't allow mixing i386 object files with Intel MCU object files. • Support floating point with software emulation: a. Long double is the same as double. b. Use __float80 for 80-bit double. • Minimize memory footprint: a. Code size b. Data size c. Stack size Here is the draft of Intel MCU psABI. The differences from IA32 psABI are 1. The minimum instruction set is Intel Pentium ISA minus instructions for x87 floating point unit. 2. There are no x87 floating point registers. 3. There are no vector registers. 4. Segment registers are optional. 5. Support for TLS relocations are optional. 6. Scalar types larger than 4 bytes are aligned to 4 bytes. 7. There are no vector types. 8. _Decimal32, _Decimal64, and _Decimal128 types are optional. 9. long double type is the same as double. 10. float, double and long double types are passed and returned in general purpose registers. 11. _Decimal32 and _Decimal64 types are passed in general purpose registers. 12. Aggregate types no larger than 8 bytes are passed and returned in general purpose registers. 13. Stack is 4-byte aligned. 14. The auxiliary vector support is optional. 15. Register %edx has undefined value at process entry. 16. New ELF machine code: EM_IAMCU. 17. New predefined C/C++ pre-processor symbols: __iamcu and __iamcu__ Change-Id: I6a0c45ad22d8f710b6f37a041aaa2fc1bf0b1c39 Signed-off-by: Anas Nashif <anas.nashif@intel.com>
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4 changed files with 31 additions and 3 deletions
2
Makefile
2
Makefile
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@ -631,7 +631,7 @@ endif
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endif
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KBUILD_CFLAGS += $(stackp-flag)
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export x86_FLAGS arm_FLAGS arc_FLAGS LDFLAG_LINKERCMD
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export x86_FLAGS arm_FLAGS arc_FLAGS LDFLAG_LINKERCMD OUTPUT_FORMAT OUTPUT_ARCH
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ARCHFLAGS = $($(SRCARCH)_FLAGS)
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@ -44,9 +44,14 @@ OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
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#elif defined(CONFIG_ARC)
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OUTPUT_FORMAT("elf32-littlearc", "elf32-bigarc", "elf32-littlearc")
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#else
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#if defined(__IAMCU)
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OUTPUT_FORMAT("elf32-iamcu")
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OUTPUT_ARCH(iamcu:intel)
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#else
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OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
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OUTPUT_ARCH(i386)
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#endif
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#endif
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/*
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* The GROUP_START() and GROUP_END() macros are used to define a group
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21
scripts/Makefile.toolchain.iamcu
Normal file
21
scripts/Makefile.toolchain.iamcu
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@ -0,0 +1,21 @@
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ifndef IAMCU_TOOLCHAIN_PATH
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$(error IAMCU_TOOLCHAIN_PATH is not set)
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endif
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CROSS_COMPILE_TARGET_x86 = i586-intel-elfiamcu
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CROSS_COMPILE_x86_version = 4.9.3
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CROSS_COMPILE_x86=${IAMCU_TOOLCHAIN_PATH}/bin/${CROSS_COMPILE_TARGET_x86}-
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CROSS_COMPILE= $(CROSS_COMPILE_$(ARCH))
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LIB_INCLUDE_DIR_x86 = -L $(IAMCU_TOOLCHAIN_PATH)/lib/gcc/$(CROSS_COMPILE_TARGET_x86)/$(CROSS_COMPILE_x86_version)
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LIB_INCLUDE_DIR = $(LIB_INCLUDE_DIR_$(ARCH))
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TOOLCHAIN_LIBS = gcc
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LD_TOOLCHAIN ?= -D__GCC_LINKER_CMD__ -D__IAMCU
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OUTPUT_FORMAT = elf32-iamcu
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OUTPUT_ARCH = iamcu:intel
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export CROSS_COMPILE TOOLCHAIN_LIBS LIB_INCLUDE_DIR
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@ -76,9 +76,11 @@ initial_link()
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# ${2} output file (staticIdt.o)
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gen_idt()
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{
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${OBJCOPY} -I elf32-i386 -O binary -j intList ${1} isrList.bin
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test -z $OUTPUT_FORMAT && OUTPUT_FORMAT=elf32-i386
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test -z $OUTPUT_ARCH && OUTPUT_ARCH=i386
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${OBJCOPY} -I $OUTPUT_FORMAT -O binary -j intList ${1} isrList.bin
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${GENIDT} -i isrList.bin -n ${CONFIG_IDT_NUM_VECTORS:-256} -o staticIdt.bin
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${OBJCOPY} -I binary -B i386 -O elf32-i386 --rename-section .data=staticIdt staticIdt.bin ${2}
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${OBJCOPY} -I binary -B $OUTPUT_ARCH -O $OUTPUT_FORMAT --rename-section .data=staticIdt staticIdt.bin ${2}
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rm -f staticIdt.bin
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rm -f isrList.bin
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}
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