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/* ****************************************************************************
* asm.h -- libfxsys' assembly utilities.
* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
*
* This file is part of the 'casiowin/libfxsys' module in libcarrot, an
* experimental modular libc project.
*
* This file is governed by the CeCILL-C license under French law and abiding
* by the rules of distribution of free software. You can use, modify and or
* redistribute it under the terms of the CeCILL-C license as circulated by
* CEA, CNRS and INRIA at the following URL: http://www.cecill.info
*
* As a counterpart to the access to the source code and rights to copy, modify
* and redistribute granted by the license, users are provided only with a
* limited warranty and the software's author, the holder of the economic
* rights, and the successive licensors have only limited liability.
*
* In this respect, the user's attention is drawn to the risks associated with
* loading, using, modifying and/or developing and reproducing the software by
* the user in light of its specific status of free software, that may mean
* that it is complicated to manipulate, and that also therefore means that it
* is reserved for developers and experienced professionals having in-depth
* computer knowledge. Users are therefore encouraged to load and test the
* software's suitability as regards their requirements in conditions enabling
* the security of their systems and/or data to be ensured and, more generally,
* to use and operate it in the same conditions as regards security.
*
* The fact that you are presently reading this means you have had knowledge of
* the CeCILL-C license and that you accept its terms.
* ************************************************************************* */
/* Make the syscall entry */
# define ENTRY(_NAME) \
.section .text; \
.global _NAME; \
.type _NAME, @function; \
.align 2; \
_NAME:
/* Make the bare syscall, using the `sc_addr` symbol. */
# define SYSCALL_BARE(_NAME, _X) \
ENTRY(_NAME) \
mov.l sc_addr, r2; \
mov.l 1f, r0; \
jmp @r2; \
nop; \
1: .long _X
/* Define the local `sc_addr` local symbol, which is where the syscall table
* address is. */
# define SYSCALL_ADDRESS \
sc_addr: .long 0x80010070
/* Define a syscall, defining and using the `sc_addr` local symbol. */
# define SYSCALL(_NAME, _X) \
SYSCALL_BARE(_NAME, _X); \
SYSCALL_ADDRESS
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