114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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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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