linux-kernel - [RFC PATCH 4/9] tools/nolibc: m68k: Add relocation support

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Message-ID: <20260131074440.732588-5-daniel@thingy.jp>
Date: Sat, 31 Jan 2026 16:44:35 +0900
From: Daniel Palmer <daniel@...ngy.jp>
To: linux@...ssschuh.net,
	w@....eu
Cc: kees@...nel.org,
	linux-kernel@...r.kernel.org,
	Daniel Palmer <daniel@...ngy.jp>
Subject: [RFC PATCH 4/9] tools/nolibc: m68k: Add relocation support

Add support for handling relocations on m68k.

This also changes the branch to _start_c to be relative.
This might break FLAT binaries so needs to be checked
and probably wrapped in some #ifdef .. magic.

Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
---
 tools/include/nolibc/arch-m68k.h | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/tools/include/nolibc/arch-m68k.h b/tools/include/nolibc/arch-m68k.h
index 2a4fbada5e79..39df399a1f12 100644
--- a/tools/include/nolibc/arch-m68k.h
+++ b/tools/include/nolibc/arch-m68k.h
@@ -10,8 +10,12 @@
 #ifndef _NOLIBC_ARCH_M68K_H
 #define _NOLIBC_ARCH_M68K_H
 
+#define NOLIBC_ARCH_HAS_RELOC
+#define NOLIBC_ARCH_ELF32
+
 #include "compiler.h"
 #include "crt.h"
+#include "elf.h"
 
 #define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
 
@@ -129,12 +133,26 @@
 })
 
 #ifndef NOLIBC_NO_RUNTIME
+static int __relocate_rela(unsigned long base, Elf32_Rela *entry)
+{
+	switch (ELF32_R_TYPE(entry->r_info)) {
+	case R_68K_RELATIVE:
+		__relocate_rela_relative(base, entry);
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
 void _start(void);
 void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
 {
 	__asm__ volatile (
 		"movel %sp, %sp@-\n"
-		"jsr _start_c\n"
+		"lea _start_c(%pc), %a0\n"
+		"jsr (%a0)\n"
 	);
 	__nolibc_entrypoint_epilogue();
 }
-- 
2.51.0