linux-kernel - [RFC PATCH v2 04/10] tools/nolibc: m68k: Add relocation support

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Message-ID: <20260204124542.523567-5-daniel@thingy.jp>
Date: Wed,  4 Feb 2026 21:45:36 +0900
From: Daniel Palmer <daniel@...ngy.jp>
To: w@....eu,
	linux@...ssschuh.net
Cc: linux-kernel@...r.kernel.org,
	Daniel Palmer <daniel@...ngy.jp>
Subject: [RFC PATCH v2 04/10] 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 | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/tools/include/nolibc/arch-m68k.h b/tools/include/nolibc/arch-m68k.h
index 2a4fbada5e79..e82ff48d3fb8 100644
--- a/tools/include/nolibc/arch-m68k.h
+++ b/tools/include/nolibc/arch-m68k.h
@@ -10,8 +10,16 @@
 #ifndef _NOLIBC_ARCH_M68K_H
 #define _NOLIBC_ARCH_M68K_H
 
+#include "elf.h"
+
+#ifdef R_68K_RELATIVE
+#define _NOLIBC_ARCH_HAS_RELOC
+#define _NOLIBC_ARCH_ELF32
+#endif
+
 #include "compiler.h"
 #include "crt.h"
+#include "reloc.h"
 
 #define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
 
@@ -129,12 +137,29 @@
 })
 
 #ifndef NOLIBC_NO_RUNTIME
+
+#ifdef NOLIBC_WANT_RELOC
+static __inline__ int __relocate_rela(unsigned long base, _nolibc_elf_rela *entry)
+{
+	switch (_nolibc_elf_r_type(entry->r_info)) {
+	case R_68K_RELATIVE:
+		__relocate_rela_relative(base, entry);
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+#endif /* NOLIBC_WANT_RELOC */
+
 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