arch-m68k.h

  1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
  2/*
  3 * m68k specific definitions for NOLIBC
  4 * Copyright (C) 2025 Daniel Palmer<daniel@thingy.jp>
  5 *
  6 * Roughly based on one or more of the other arch files.
  7 *
  8 */
  9
 10#ifndef _NOLIBC_ARCH_M68K_H
 11#define _NOLIBC_ARCH_M68K_H
 12
 13#include "compiler.h"
 14#include "crt.h"
 15
 16#define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
 17
 18#define my_syscall0(num)                                                      \
 19({                                                                            \
 20	register long _num __asm__ ("d0") = (num);                            \
 21									      \
 22	__asm__ volatile (                                                    \
 23		"trap #0\n"                                                   \
 24		: "+r"(_num)                                                  \
 25		: "r"(_num)                                                   \
 26		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
 27	);                                                                    \
 28	_num;                                                                 \
 29})
 30
 31#define my_syscall1(num, arg1)                                                \
 32({                                                                            \
 33	register long _num __asm__ ("d0") = (num);                            \
 34	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
 35									      \
 36	__asm__ volatile (                                                    \
 37		"trap #0\n"                                                   \
 38		: "+r"(_num)                                                  \
 39		: "r"(_arg1)                                                  \
 40		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
 41	);                                                                    \
 42	_num;                                                                 \
 43})
 44
 45#define my_syscall2(num, arg1, arg2)                                          \
 46({                                                                            \
 47	register long _num __asm__ ("d0") = (num);                            \
 48	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
 49	register long _arg2 __asm__ ("d2") = (long)(arg2);                    \
 50									      \
 51	__asm__ volatile (                                                    \
 52		"trap #0\n"                                                   \
 53		: "+r"(_num)                                                  \
 54		: "r"(_arg1), "r"(_arg2)                                      \
 55		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
 56	);                                                                    \
 57	_num;                                                                 \
 58})
 59
 60#define my_syscall3(num, arg1, arg2, arg3)                                    \
 61({                                                                            \
 62	register long _num __asm__ ("d0")  = (num);                           \
 63	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
 64	register long _arg2 __asm__ ("d2") = (long)(arg2);                    \
 65	register long _arg3 __asm__ ("d3") = (long)(arg3);                    \
 66									      \
 67	__asm__ volatile (                                                    \
 68		"trap #0\n"                                                   \
 69		: "+r"(_num)                                                  \
 70		: "r"(_arg1), "r"(_arg2), "r"(_arg3)                          \
 71		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
 72	);                                                                    \
 73	_num;                                                                 \
 74})
 75
 76#define my_syscall4(num, arg1, arg2, arg3, arg4)                              \
 77({                                                                            \
 78	register long _num __asm__ ("d0") = (num);                            \
 79	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
 80	register long _arg2 __asm__ ("d2") = (long)(arg2);                    \
 81	register long _arg3 __asm__ ("d3") = (long)(arg3);                    \
 82	register long _arg4 __asm__ ("d4") = (long)(arg4);                    \
 83									      \
 84	__asm__ volatile (                                                    \
 85		"trap #0\n"                                                   \
 86		: "+r" (_num)                                                 \
 87		: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4)              \
 88		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
 89	);                                                                    \
 90	_num;                                                                 \
 91})
 92
 93#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5)                        \
 94({                                                                            \
 95	register long _num __asm__ ("d0") = (num);                            \
 96	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
 97	register long _arg2 __asm__ ("d2") = (long)(arg2);                    \
 98	register long _arg3 __asm__ ("d3") = (long)(arg3);                    \
 99	register long _arg4 __asm__ ("d4") = (long)(arg4);                    \
100	register long _arg5 __asm__ ("d5") = (long)(arg5);                    \
101									      \
102	__asm__ volatile (                                                    \
103		"trap #0\n"                                                   \
104		: "+r" (_num)                                                 \
105		: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5)  \
106		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
107	);                                                                    \
108	_num;                                                                 \
109})
110
111#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6)                  \
112({                                                                            \
113	register long _num __asm__ ("d0")  = (num);                           \
114	register long _arg1 __asm__ ("d1") = (long)(arg1);                    \
115	register long _arg2 __asm__ ("d2") = (long)(arg2);                    \
116	register long _arg3 __asm__ ("d3") = (long)(arg3);                    \
117	register long _arg4 __asm__ ("d4") = (long)(arg4);                    \
118	register long _arg5 __asm__ ("d5") = (long)(arg5);                    \
119	register long _arg6 __asm__ ("a0") = (long)(arg6);                    \
120									      \
121	__asm__ volatile (                                                    \
122		"trap #0\n"                                                   \
123		: "+r" (_num)                                                 \
124		: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
125		  "r"(_arg6)                                                  \
126		: _NOLIBC_SYSCALL_CLOBBERLIST                                 \
127	);                                                                    \
128	_num;                                                                 \
129})
130
131#ifndef NOLIBC_NO_RUNTIME
132void _start(void);
133void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
134{
135	__asm__ volatile (
136		"movel %sp, %sp@-\n"
137		"jsr _start_c\n"
138	);
139	__nolibc_entrypoint_epilogue();
140}
141#endif /* NOLIBC_NO_RUNTIME */
142
143#endif /* _NOLIBC_ARCH_M68K_H */