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Message-ID: <20250426041212.4141152-1-daniel@0x0f.com>
Date: Sat, 26 Apr 2025 13:12:12 +0900
From: Daniel Palmer <daniel@...f.com>
To: w@....eu,
linux@...ssschuh.net,
linux-m68k@...ts.linux-m68k.org,
geert@...ux-m68k.org
Cc: linux-kernel@...r.kernel.org,
Daniel Palmer <daniel@...ngy.jp>
Subject: [PATCH] tools/nolibc: Add m68k support
From: Daniel Palmer <daniel@...ngy.jp>
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@...ngy.jp>
---
tools/include/nolibc/arch-m68k.h | 141 +++++++++++++++++++++++++++++++
tools/include/nolibc/arch.h | 2 +
2 files changed, 143 insertions(+)
create mode 100644 tools/include/nolibc/arch-m68k.h
diff --git a/tools/include/nolibc/arch-m68k.h b/tools/include/nolibc/arch-m68k.h
new file mode 100644
index 000000000000..6dac1845f298
--- /dev/null
+++ b/tools/include/nolibc/arch-m68k.h
@@ -0,0 +1,141 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * m68k specific definitions for NOLIBC
+ * Copyright (C) 2025 Daniel Palmer<daniel@...ngy.jp>
+ *
+ * Roughly based on one or more of the other arch files.
+ *
+ */
+
+#ifndef _NOLIBC_ARCH_M68K_H
+#define _NOLIBC_ARCH_M68K_H
+
+#include "compiler.h"
+#include "crt.h"
+
+#define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
+
+#define my_syscall0(num) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r"(_num) \
+ : "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall1(num, arg1) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r"(_num) \
+ : "r"(_arg1) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall2(num, arg1, arg2) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ register long _arg2 __asm__ ("d2") = (long)(arg2); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r"(_num) \
+ : "r"(_arg1), "r"(_arg2) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall3(num, arg1, arg2, arg3) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ register long _arg2 __asm__ ("d2") = (long)(arg2); \
+ register long _arg3 __asm__ ("d3") = (long)(arg3); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r"(_num) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall4(num, arg1, arg2, arg3, arg4) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ register long _arg2 __asm__ ("d2") = (long)(arg2); \
+ register long _arg3 __asm__ ("d3") = (long)(arg3); \
+ register long _arg4 __asm__ ("d4") = (long)(arg4); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r" (_num) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ register long _arg2 __asm__ ("d2") = (long)(arg2); \
+ register long _arg3 __asm__ ("d3") = (long)(arg3); \
+ register long _arg4 __asm__ ("d4") = (long)(arg4); \
+ register long _arg5 __asm__ ("d5") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r" (_num) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("d0") = (num); \
+ register long _arg1 __asm__ ("d1") = (long)(arg1); \
+ register long _arg2 __asm__ ("d2") = (long)(arg2); \
+ register long _arg3 __asm__ ("d3") = (long)(arg3); \
+ register long _arg4 __asm__ ("d4") = (long)(arg4); \
+ register long _arg5 __asm__ ("d5") = (long)(arg5); \
+ register long _arg6 __asm__ ("a0") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "trap #0\n" \
+ : "+r" (_num) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
+ "r"(_arg6) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _num; \
+})
+
+void _start(void);
+void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
+{
+ __asm__ volatile (
+ "movel %sp, %sp@-\n"
+ "jsr _start_c\n"
+ );
+ __nolibc_entrypoint_epilogue();
+}
+
+#endif /* _NOLIBC_ARCH_M68K_H */
diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h
index 8a2c143c0fba..ba3da0f098f1 100644
--- a/tools/include/nolibc/arch.h
+++ b/tools/include/nolibc/arch.h
@@ -33,6 +33,8 @@
#include "arch-s390.h"
#elif defined(__loongarch__)
#include "arch-loongarch.h"
+#elif defined(__m68k__)
+#include "arch-m68k.h"
#else
#error Unsupported Architecture
#endif
--
2.49.0
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