334 lines
9.1 KiB
C
334 lines
9.1 KiB
C
/*
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* Copyright (c) 2010-2014,2017 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief GCC toolchain abstraction
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*
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* Macros to abstract compiler capabilities for GCC toolchain.
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*/
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/*
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* GCC 4.6 and higher have _Static_assert built in, and its output is
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* easier to understand than the common BUILD_ASSERT macros.
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*/
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
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#define BUILD_ASSERT(EXPR) _Static_assert(EXPR, "")
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#define BUILD_ASSERT_MSG(EXPR, MSG) _Static_assert(EXPR, MSG)
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#endif
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#include <toolchain/common.h>
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#define ALIAS_OF(of) __attribute__((alias(#of)))
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#define FUNC_ALIAS(real_func, new_alias, return_type) \
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return_type new_alias() ALIAS_OF(real_func)
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#if defined(CONFIG_ARCH_POSIX)
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/*let's not segfault if this were to happen for some reason*/
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#define CODE_UNREACHABLE \
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{\
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posix_print_error_and_exit("CODE_UNREACHABLE reached from %s:%d\n",\
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__FILE__, __LINE__);\
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__builtin_unreachable(); \
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}
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#else
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#define CODE_UNREACHABLE __builtin_unreachable()
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#endif
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#define FUNC_NORETURN __attribute__((__noreturn__))
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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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/* 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 UNALIGNED_PUT(v, p) \
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do { \
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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 = (v); \
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} while (0)
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/* Double indirection to ensure section names are expanded before
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* stringification
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*/
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#define __GENERIC_SECTION(segment) __attribute__((section(STRINGIFY(segment))))
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#define _GENERIC_SECTION(segment) __GENERIC_SECTION(segment)
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#define ___in_section(a, b, c) \
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__attribute__((section("." _STRINGIFY(a) \
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"." _STRINGIFY(b) \
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"." _STRINGIFY(c))))
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#define __in_section(a, b, c) ___in_section(a, b, c)
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#define __in_section_unique(seg) ___in_section(seg, __FILE__, __COUNTER__)
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#ifdef CONFIG_APPLICATION_MEMORY
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#define __kernel __in_section_unique(kernel)
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#define __kernel_noinit __in_section_unique(kernel_noinit)
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#define __kernel_bss __in_section_unique(kernel_bss)
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#else
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#define __kernel
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#define __kernel_noinit __noinit
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#define __kernel_bss
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#endif
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#ifndef __packed
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#define __packed __attribute__((__packed__))
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#endif
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#ifndef __aligned
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#define __aligned(x) __attribute__((__aligned__(x)))
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#endif
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#define __may_alias __attribute__((__may_alias__))
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#ifndef __printf_like
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#define __printf_like(f, a) __attribute__((format (printf, f, a)))
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#endif
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#define __used __attribute__((__used__))
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#define __deprecated __attribute__((deprecated))
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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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#define popcount(x) __builtin_popcount(x)
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#define __weak __attribute__((__weak__))
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#define __unused __attribute__((__unused__))
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/* Be *very* careful with this, you cannot filter out with -wno-deprecated,
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* which has implications for -Werror
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*/
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#define __DEPRECATED_MACRO _Pragma("GCC warning \"Macro is deprecated\"")
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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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#if defined(CONFIG_ARM) || defined(CONFIG_NIOS2) || defined(CONFIG_RISCV32) \
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|| defined(CONFIG_XTENSA)
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#define GTEXT(sym) .global sym; .type sym, %function
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#define GDATA(sym) .global sym; .type sym, %object
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#define WTEXT(sym) .weak sym; .type sym, %function
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#define WDATA(sym) .weak sym; .type 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 \symbol
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.type \symbol, %function
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.endm
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.macro glbl_data symbol
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.globl \symbol
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.type \symbol, %object
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.endm
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.macro weak_data symbol
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.weak \symbol
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.type \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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#define WDATA(sym) weak_data sym
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#else /* !CONFIG_ARM && !CONFIG_ARC */
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#define GTEXT(sym) .globl sym; .type sym, @function
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#define GDATA(sym) .globl sym; .type 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\().\symbol
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\symbol :
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.endm
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.macro section_func section, symbol
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.section .\section\().\symbol, "ax"
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FUNC_CODE()
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PERFOPT_ALIGN
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\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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\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.##sym; sym :
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#define SECTION_FUNC(sect, sym) \
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.section .sect.sym, "ax"; \
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FUNC_CODE() \
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PERFOPT_ALIGN; 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; 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_C 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) || 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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#elif defined(CONFIG_NIOS2) || defined(CONFIG_RISCV32) || defined(CONFIG_XTENSA)
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/* No special prefixes necessary for constants in this arch AFAICT */
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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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",%0" \
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"\n\t.type\t" #name ",%%object" : : "n"(value))
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#elif defined(CONFIG_ARCH_POSIX)
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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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#define compiler_barrier() do { \
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__asm__ __volatile__ ("" ::: "memory"); \
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} while ((0))
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