linux-kernel - [RFC PATCH v2 07/10] tools/nolibc: arm: Add relocation support

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Message-ID: <20260204124542.523567-8-daniel@thingy.jp>
Date: Wed,  4 Feb 2026 21:45:39 +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 07/10] tools/nolibc: arm: Add relocation support

Add relocation support for arm.

Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
---
 tools/include/nolibc/arch-arm.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-arm.h
index 251c42579028..0a0d864c857a 100644
--- a/tools/include/nolibc/arch-arm.h
+++ b/tools/include/nolibc/arch-arm.h
@@ -7,8 +7,17 @@
 #ifndef _NOLIBC_ARCH_ARM_H
 #define _NOLIBC_ARCH_ARM_H
 
+#include "elf.h"
+
+#ifdef R_ARM_RELATIVE
+#define _NOLIBC_ARCH_HAS_RELOC
+#define _NOLIBC_ARCH_ELF32
+#define _NOLIBC_ARCH_ELF_REL
+#endif
+
 #include "compiler.h"
 #include "crt.h"
+#include "reloc.h"
 
 /* Syscalls for ARM in ARM or Thumb modes :
  *   - registers are 32-bit
@@ -185,6 +194,22 @@
 })
 
 #ifndef NOLIBC_NO_RUNTIME
+
+#ifdef NOLIBC_WANT_RELOC
+static __inline__ int __relocate_rel(unsigned long base, _nolibc_elf_rel *entry)
+{
+	switch (_nolibc_elf_r_type(entry->r_info)) {
+	case R_ARM_RELATIVE:
+		__relocate_rel_relative(base, entry);
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+#endif /* NOLIBC_WANT_RELOC */
+
 /* startup code */
 void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
 {
-- 
2.51.0