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66a4f9bb1e
Add nolibc support for m68k. Should be helpful for nommu where linking libc can bloat even hello world to the point where you get an OOM just trying to load it. Signed-off-by: Daniel Palmer <daniel@thingy.jp> Link: https://lore.kernel.org/r/20250426224738.284874-1-daniel@0x0f.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
142 lines
7.2 KiB
C
142 lines
7.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* m68k specific definitions for NOLIBC
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* Copyright (C) 2025 Daniel Palmer<daniel@thingy.jp>
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*
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* Roughly based on one or more of the other arch files.
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*
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*/
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#ifndef _NOLIBC_ARCH_M68K_H
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#define _NOLIBC_ARCH_M68K_H
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#include "compiler.h"
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#include "crt.h"
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#define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
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#define my_syscall0(num) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_arg1) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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register long _arg4 __asm__ ("d4") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r" (_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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register long _arg4 __asm__ ("d4") = (long)(arg4); \
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register long _arg5 __asm__ ("d5") = (long)(arg5); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r" (_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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register long _arg4 __asm__ ("d4") = (long)(arg4); \
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register long _arg5 __asm__ ("d5") = (long)(arg5); \
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register long _arg6 __asm__ ("a0") = (long)(arg6); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r" (_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
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"r"(_arg6) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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void _start(void);
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void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
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{
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__asm__ volatile (
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"movel %sp, %sp@-\n"
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"jsr _start_c\n"
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);
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__nolibc_entrypoint_epilogue();
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}
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#endif /* _NOLIBC_ARCH_M68K_H */
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