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9aeb08213f
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>
108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/* linker-tool-gcc.h - GCC toolchain linker defs */
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/*
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* Copyright (c) 2013-2014, Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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This header file defines the necessary macros used by the linker script for
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use with the GCC linker.
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*/
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#ifndef __LINKER_TOOL_GCC_H
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#define __LINKER_TOOL_GCC_H
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#if defined(CONFIG_CPU_CORTEX_M)
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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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* of sections located in one memory area, such as RAM, ROM, etc.
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* The <where> parameter is the name of the memory area.
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*/
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#define GROUP_START(where)
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#define GROUP_END(where)
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/*
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* The GROUP_LINK_IN() macro is located at the end of the section
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* description and tells the linker that this section is located in
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* the memory area specified by <where> argument.
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*/
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#define GROUP_LINK_IN(where) > where
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/*
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* The GROUP_FOLLOWS_AT() macro is located at the end of the section
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* and indicates that the section does not specify an address at which
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* it is to be loaded, but that it follows a section which did specify
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* such an address
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*/
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#define GROUP_FOLLOWS_AT(where) AT > where
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/*
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* The SECTION_PROLOGUE() macro is used to define the beginning of a section.
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* The <name> parameter is the name of the section, and the <option> parameter
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* is to include any special options such as (NOLOAD). Page alignment has its
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* own parameter since it needs abstraction across the different toolchains.
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* If not required, the <options> and <align> parameters should be left blank.
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*/
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#define SECTION_PROLOGUE(name, options, align) name options : align
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/*
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* The SECTION_AT_PROLOGUE() macro is similar to SECTION_PROLOGUE() except
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* that, in addition, the address at which the section is to be loaded is
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* specified.
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*/
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#define SECTION_AT_PROLOGUE(name, options, align, addr) \
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name options : align AT(addr)
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/* Diab-isms */
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#define SORT_BY_NAME(x) SORT(x)
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#define OPTIONAL
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/* see linker-tool-diab.h for description */
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#define PGALIGN_ALIGN(x) ALIGN(x)
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#define COMMON_SYMBOLS *(COMMON)
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#endif /* !__LINKER_TOOL_GCC_H */
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