linux-kernel - [RFC PATCH 5/9] tools/nolibc: x86: Add relocation support for x86

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Message-ID: <20260131074440.732588-6-daniel@thingy.jp>
Date: Sat, 31 Jan 2026 16:44:36 +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 5/9] tools/nolibc: x86: Add relocation support for x86_64

Add relocation support for x86, both 32bit and 64bit.

Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
---
 tools/include/nolibc/arch-x86.h | 35 +++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/tools/include/nolibc/arch-x86.h b/tools/include/nolibc/arch-x86.h
index f6c43ac5377b..3639c1104e0d 100644
--- a/tools/include/nolibc/arch-x86.h
+++ b/tools/include/nolibc/arch-x86.h
@@ -7,8 +7,17 @@
 #ifndef _NOLIBC_ARCH_X86_H
 #define _NOLIBC_ARCH_X86_H
 
+#define NOLIBC_ARCH_HAS_RELOC
+#if !defined(__x86_64__)
+#define NOLIBC_ARCH_ELF32
+#define NOLIBC_ARCH_ELF_REL
+#elif defined(__x86_64__) && defined(__ILP32__)
+#define NOLIBC_ARCH_ELF32
+#endif
+
 #include "compiler.h"
 #include "crt.h"
+#include "elf.h"
 
 #if !defined(__x86_64__)
 
@@ -158,6 +167,19 @@
 })
 
 #ifndef NOLIBC_NO_RUNTIME
+static int __relocate_rel(unsigned long base, elf_rel *entry)
+{
+	switch (elf_r_type(entry->r_info)) {
+	case R_386_RELATIVE:
+		__relocate_rel_relative(base, entry);
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
 /* startup code */
 /*
  * i386 System V ABI mandates:
@@ -326,6 +348,19 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
 })
 
 #ifndef NOLIBC_NO_RUNTIME
+static int __relocate_rela(unsigned long base, elf_rela *entry)
+{
+	switch (elf_r_type(entry->r_info)) {
+	case R_AMD64_RELATIVE:
+		__relocate_rela_relative(base, entry);
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
 /* startup code */
 /*
  * x86-64 System V ABI mandates:
-- 
2.51.0