mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-05 21:01:56 +00:00
6bf328b6ea
This doesn't make any assumptions on calling conventions or the structure of the stack, and should thus be portable to compilers that implement different C calling conventions. In order for the rewritten functions to take up the same code size as the pure-asm counterparts, -fomit-frame-pointer has been specified for each of them, otherwise an extra 4 bytes is used for every function. The generated assembly code by these new functions has been verified in GDB to be the same as the old ones, except a few trivial things like particular registers used. Change-Id: I9a896cbfc3e7f4c2497d749140729d28b32f1c9d Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/* toolchain/gcc.h - GCC toolchain abstraction */
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/*
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* Copyright (c) 2010-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* DESCRIPTION
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* Macros to abstract compiler capabilities for GCC toolchain.
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*/
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#include <toolchain/common.h>
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#define FUNC_ALIAS(real_func, new_alias, return_type) \
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return_type new_alias() __attribute__((alias(#real_func)))
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#define _ALIAS_OF(of) __attribute__((alias(#of)))
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#define CODE_UNREACHABLE __builtin_unreachable()
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#define FUNC_NORETURN __attribute__((__noreturn__))
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#define FUNC_NO_FP __attribute__((optimize("-fomit-frame-pointer")))
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/* The GNU assembler for Cortex-M3 uses # for immediate values, not
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* comments, so the @nobits# trick does not work.
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*/
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#if defined(CONFIG_ARM)
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#define _NODATA_SECTION(segment) __attribute__((section(#segment)))
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#else
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#define _NODATA_SECTION(segment) \
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__attribute__((section(#segment ",\"wa\",@nobits#")))
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#endif
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#define UNALIGNED_READ(p) (*(p))
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#define UNALIGNED_WRITE(p, v) \
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do { \
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unsigned int __attribute__((__may_alias__)) *pp = (unsigned int *)(p); \
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*pp = (v); \
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} \
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while (0)
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/* Unaligned access */
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#define UNALIGNED_GET(p) \
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__extension__ ({ \
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struct __attribute__((__packed__)) { \
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__typeof__(*(p)) __v; \
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} *__p = (__typeof__(__p)) (p); \
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__p->__v; \
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})
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#define _GENERIC_SECTION(segment) __attribute__((section(#segment)))
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#define __packed __attribute__((__packed__))
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#define __aligned(x) __attribute__((__aligned__(x)))
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#define __may_alias __attribute__((__may_alias__))
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#define __printf_like(f, a) __attribute__((format (printf, f, a)))
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#define __used __attribute__((__used__))
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#define ARG_UNUSED(x) (void)(x)
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#define likely(x) __builtin_expect((long)!!(x), 1L)
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#define unlikely(x) __builtin_expect((long)!!(x), 0L)
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/* These macros allow having ARM asm functions callable from thumb */
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#if defined(_ASMLANGUAGE) && !defined(_LINKER)
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#ifdef CONFIG_ARM
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#if defined(CONFIG_ISA_THUMB)
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#define FUNC_CODE() \
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.code 16; \
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.thumb_func;
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#define FUNC_INSTR(a) \
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BX pc; \
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NOP; \
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.code 32; \
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A##a:
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#elif defined(CONFIG_ISA_THUMB2)
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#define FUNC_CODE() .thumb;
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#define FUNC_INSTR(a)
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#elif defined(CONFIG_ISA_ARM)
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#define FUNC_CODE() .code 32;
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#define FUNC_INSTR(a)
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#else
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#error unknown instruction set
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#endif /* ISA */
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#else
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#define FUNC_CODE()
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#define FUNC_INSTR(a)
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#endif /* !CONFIG_ARM */
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#endif /* _ASMLANGUAGE && !_LINKER */
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/*
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* These macros are used to declare assembly language symbols that need
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* to be typed properly(func or data) to be visible to the OMF tool.
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* So that the build tool could mark them as an entry point to be linked
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* correctly. This is an elfism. Use #if 0 for a.out.
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*/
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#if defined(_ASMLANGUAGE) && !defined(_LINKER)
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#ifdef CONFIG_ARM
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#define GTEXT(sym) .global FUNC(sym); .type FUNC(sym), %function
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#define GDATA(sym) .global FUNC(sym); .type FUNC(sym), %object
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#define WTEXT(sym) .weak FUNC(sym); .type FUNC(sym), %function
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#define WDATA(sym) .weak FUNC(sym); .type FUNC(sym), %object
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#elif defined(CONFIG_ARC)
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/*
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* Need to use assembly macros because ';' is interpreted as the start of
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* a single line comment in the ARC assembler.
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*/
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.macro glbl_text symbol
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.globl FUNC(\symbol)
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.type FUNC(\symbol), %function
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.endm
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.macro glbl_data symbol
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.globl FUNC(\symbol)
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.type FUNC(\symbol), %object
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.endm
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#define GTEXT(sym) glbl_text sym
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#define GDATA(sym) glbl_data sym
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#else /* !CONFIG_ARM && !CONFIG_ARC */
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#define GTEXT(sym) .globl FUNC(sym); .type FUNC(sym), @function
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#define GDATA(sym) .globl FUNC(sym); .type FUNC(sym), @object
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#endif
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/*
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* These macros specify the section in which a given function or variable
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* resides.
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*
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* - SECTION_FUNC allows only one function to reside in a sub-section
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* - SECTION_SUBSEC_FUNC allows multiple functions to reside in a sub-section
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* This ensures that garbage collection only discards the section
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* if all functions in the sub-section are not referenced.
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*/
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#if defined(CONFIG_ARC)
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/*
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* Need to use assembly macros because ';' is interpreted as the start of
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* a single line comment in the ARC assembler.
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*
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* Also, '\()' is needed in the .section directive of these macros for
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* correct substitution of the 'section' variable.
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*/
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.macro section_var section, symbol
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.section .\section\().FUNC(\symbol)
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FUNC(\symbol) :
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.endm
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.macro section_func section, symbol
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.section .\section\().FUNC(\symbol), "ax"
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FUNC_CODE()
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PERFOPT_ALIGN
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FUNC(\symbol) :
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FUNC_INSTR(\symbol)
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.endm
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.macro section_subsec_func section, subsection, symbol
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.section .\section\().\subsection, "ax"
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PERFOPT_ALIGN
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FUNC(\symbol) :
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.endm
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#define SECTION_VAR(sect, sym) section_var sect, sym
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#define SECTION_FUNC(sect, sym) section_func sect, sym
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#define SECTION_SUBSEC_FUNC(sect, subsec, sym) \
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section_subsec_func sect, subsec, sym
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#else /* !CONFIG_ARC */
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#define SECTION_VAR(sect, sym) .section .sect.FUNC(sym); FUNC(sym) :
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#define SECTION_FUNC(sect, sym) \
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.section .sect.FUNC(sym), "ax"; \
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FUNC_CODE() \
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PERFOPT_ALIGN; FUNC(sym) : \
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FUNC_INSTR(sym)
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#define SECTION_SUBSEC_FUNC(sect, subsec, sym) \
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.section .sect.subsec, "ax"; PERFOPT_ALIGN; FUNC(sym) :
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#endif /* CONFIG_ARC */
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#endif /* _ASMLANGUAGE && !_LINKER */
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#if defined(CONFIG_ARM) && defined(_ASMLANGUAGE)
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#if defined(CONFIG_ISA_THUMB2)
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/* '.syntax unified' is a gcc-ism used in thumb-2 asm files */
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#define _ASM_FILE_PROLOGUE .text; .syntax unified; .thumb
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#elif defined(CONFIG_ISA_THUMB)
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#define _ASM_FILE_PROLOGUE .text; .code 16
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#else
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#define _ASM_FILE_PROLOGUE .text; .code 32
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#endif
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#endif
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/*
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* These macros generate absolute symbols for GCC
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*/
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/* create an extern reference to the absolute symbol */
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#define GEN_OFFSET_EXTERN(name) extern const char name[]
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#define GEN_ABS_SYM_BEGIN(name) \
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extern void name(void); \
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void name(void) \
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{
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#define GEN_ABS_SYM_END }
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#if defined(CONFIG_ARM)
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/*
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* GNU/ARM backend does not have a proper operand modifier which does not
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* produces prefix # followed by value, such as %0 for PowerPC, Intel, and
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* MIPS. The workaround performed here is using %B0 which converts
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* the value to ~(value). Thus "n"(~(value)) is set in operand constraint
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* to output (value) in the ARM specific GEN_OFFSET macro.
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*/
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#define GEN_ABSOLUTE_SYM(name, value) \
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__asm__(".globl\t" #name "\n\t.equ\t" #name \
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",%B0" \
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"\n\t.type\t" #name ",%%object" : : "n"(~(value)))
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#elif defined(CONFIG_X86_32) || defined(CONFIG_ARC)
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#define GEN_ABSOLUTE_SYM(name, value) \
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__asm__(".globl\t" #name "\n\t.equ\t" #name \
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",%c0" \
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"\n\t.type\t" #name ",@object" : : "n"(value))
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#else
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#error processor architecture not supported
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#endif
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