2b72262b4f
I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sys/syscall.h
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* Functions and macros for declaring system call stubs.
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*/
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#ifndef INCLUDE_SYS_SYSCALL_H
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#define INCLUDE_SYS_SYSCALL_H
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#if !__STDC_HOSTED__
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#error "This file is part of user-space and should not be built into libk"
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#endif
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#include <sys/cdefs.h>
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#include <sortix/syscall.h>
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/* Expand a macro and convert it to string. */
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#define SYSCALL_STRINGIFY_EXPAND(foo) #foo
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/* Implement the body of a function that selects the right system call and
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jumps into the generic implementation of system calls. */
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#if defined(__i386__)
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#define SYSCALL_FUNCTION_BODY(syscall_index) \
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" mov $" SYSCALL_STRINGIFY_EXPAND(syscall_index) ", %eax\n" \
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" jmp asm_syscall\n"
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#elif defined(__x86_64__)
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#define SYSCALL_FUNCTION_BODY(syscall_index) \
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" mov $" SYSCALL_STRINGIFY_EXPAND(syscall_index) ", %rax\n" \
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" jmp asm_syscall\n"
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#else
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#error "Provide an implementation for your platform."
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#endif
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/* Create a function that selects the right system call and jumps into the
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generic implementation of system calls. */
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#define SYSCALL_FUNCTION(syscall_name, syscall_index) \
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__attribute__((unused)) \
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static void __verify_index_expression_##syscall_name(void) \
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{ \
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(void) syscall_index; \
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} \
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__asm__("\n" \
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".pushsection .text\n" \
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".type " #syscall_name ", @function\n" \
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#syscall_name ":\n" \
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SYSCALL_FUNCTION_BODY(syscall_index) \
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".size " #syscall_name ", . - " #syscall_name "\n" \
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".popsection\n" \
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);
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/* Create a function that performs the system call by injecting the right
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instructions into the compiler assembly output. Then provide a declaration of
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the function that looks just like the caller wants it. */
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#ifdef __cplusplus
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#define DEFINE_SYSCALL(syscall_type, syscall_name, syscall_index, syscall_formals) \
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SYSCALL_FUNCTION(syscall_name, syscall_index) \
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extern "C" { syscall_type syscall_name syscall_formals; }
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#else
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#define DEFINE_SYSCALL(syscall_type, syscall_name, syscall_index, syscall_formals) \
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SYSCALL_FUNCTION(syscall_name, syscall_index) \
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syscall_type syscall_name syscall_formals;
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#endif
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/* System call accepting no parameters. */
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#define DEFN_SYSCALL0(type, fn, num) \
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DEFINE_SYSCALL(type, fn, num, (void))
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/* System call accepting 1 parameter. */
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#define DEFN_SYSCALL1(type, fn, num, t1) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1))
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/* System call accepting 2 parameters. */
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#define DEFN_SYSCALL2(type, fn, num, t1, t2) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2))
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/* System call accepting 3 parameters. */
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#define DEFN_SYSCALL3(type, fn, num, t1, t2, t3) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3))
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/* System call accepting 4 parameters. */
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#define DEFN_SYSCALL4(type, fn, num, t1, t2, t3, t4) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3, t4 p4))
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/* System call accepting 5 parameters. */
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#define DEFN_SYSCALL5(type, fn, num, t1, t2, t3, t4, t5) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3, t4 p4, t5 p5))
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#endif
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