990bf16206
This used to exist because in earlier versions of the system call interfaces, an "extern" declaration of the system call implementation function would precede the real inline version of the implementation. The compiler would not like this and would throw "static declaration of ‘foo’ follows non-static declaration". So alternate macros were needed which declare the implementation function as 'static inline' instead of extern. However, currently the inline version of these system call implementations appear first, the K_SYSCALL_DECLARE() macros appear in the header generated by gen_syscalls.py, which is always included at the end of the header file. The compiler does not complain if a static inline function is succeeded by an extern prototype of the same function. This lets us simplify the generated system call macros and just use __syscall everywhere. The disassembly of this was checked on x86 to ensure that for kernel-only or CONFIG_USERSPACE=n scenarios, everything is still being inlined as expected. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* Copyright (c) 2010-2014 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 Common toolchain abstraction
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*
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* Macros to abstract compiler capabilities (common to all toolchains).
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*/
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/* Abstract use of extern keyword for compatibility between C and C++ */
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#ifdef __cplusplus
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#define EXTERN_C extern "C"
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#else
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#define EXTERN_C extern
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#endif
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/* Use TASK_ENTRY_CPP to tag task entry points defined in C++ files. */
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#ifdef __cplusplus
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#define TASK_ENTRY_CPP extern "C"
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#endif
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/*
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* Generate a reference to an external symbol.
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* The reference indicates to the linker that the symbol is required
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* by the module containing the reference and should be included
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* in the image if the module is in the image.
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*
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* The assembler directive ".set" is used to define a local symbol.
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* No memory is allocated, and the local symbol does not appear in
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* the symbol table.
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*/
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#ifdef _ASMLANGUAGE
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#define REQUIRES(sym) .set sym ## _Requires, sym
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#else
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#define REQUIRES(sym) __asm__ (".set " # sym "_Requires, " # sym "\n\t");
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#endif
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#ifdef _ASMLANGUAGE
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#define SECTION .section
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#endif
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/*
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* If the project is being built for speed (i.e. not for minimum size) then
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* align functions and branches in executable sections to improve performance.
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*/
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#ifdef _ASMLANGUAGE
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#ifdef CONFIG_X86
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#ifdef PERF_OPT
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#define PERFOPT_ALIGN .balign 16
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#else
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#define PERFOPT_ALIGN .balign 1
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#endif
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#elif defined(CONFIG_ARM)
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#ifdef CONFIG_ISA_THUMB
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#define PERFOPT_ALIGN .balign 2
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#else
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#define PERFOPT_ALIGN .balign 4
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#endif
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#elif defined(CONFIG_ARC)
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#define PERFOPT_ALIGN .balign 4
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#elif defined(CONFIG_NIOS2) || defined(CONFIG_RISCV32) || \
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defined(CONFIG_XTENSA)
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#define PERFOPT_ALIGN .balign 4
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#else
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#error Architecture unsupported
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#endif
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#define GC_SECTION(sym) SECTION .text.##sym, "ax"
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#endif /* _ASMLANGUAGE */
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/* force inlining a function */
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#if !defined(_ASMLANGUAGE)
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#define ALWAYS_INLINE inline __attribute__((always_inline))
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#endif
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#define _STRINGIFY(x) #x
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#define STRINGIFY(s) _STRINGIFY(s)
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/* Indicate that an array will be used for stack space. */
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#if !defined(_ASMLANGUAGE)
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/* don't use this anymore, use K_DECLARE_STACK instead. Remove for 1.11 */
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#define __stack __aligned(STACK_ALIGN) __DEPRECATED_MACRO
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#endif
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/* concatenate the values of the arguments into one */
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#define _DO_CONCAT(x, y) x ## y
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#define _CONCAT(x, y) _DO_CONCAT(x, y)
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/* Additionally used as a sentinel by gen_syscalls.py to identify what
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* functions are system calls
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*/
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#define __syscall static inline
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#ifndef BUILD_ASSERT
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/* compile-time assertion that makes the build fail */
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#define BUILD_ASSERT(EXPR) typedef char __build_assert_failure[(EXPR) ? 1 : -1]
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#endif
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#ifndef BUILD_ASSERT_MSG
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/* build assertion with message -- common implementation swallows message. */
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#define BUILD_ASSERT_MSG(EXPR, MSG) BUILD_ASSERT(EXPR)
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#endif
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