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[v4,27/30] lib: Avoid external dependency in libelf

Message ID 20230213101759.2577077-28-nikos.nikoleris@arm.com (mailing list archive)
State New, archived
Headers show
Series EFI and ACPI support for arm64 | expand

Commit Message

Nikos Nikoleris Feb. 13, 2023, 10:17 a.m. UTC 
There is just a small number of definitions we need from
uapi/linux/elf.h and asm/elf.h and the relocation code is
self-contained.

Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
---
 arm/efi/reloc_aarch64.c |  3 +--
 lib/elf.h               | 57 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 2 deletions(-)
 create mode 100644 lib/elf.h
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Patch

diff --git a/arm/efi/reloc_aarch64.c b/arm/efi/reloc_aarch64.c
index fa0cd6bc..3f6d9a6d 100644
--- a/arm/efi/reloc_aarch64.c
+++ b/arm/efi/reloc_aarch64.c
@@ -34,8 +34,7 @@ 
     SUCH DAMAGE.
 */
 
-#include "efi.h"
-#include <elf.h>
+#include <efi.h>
 
 efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image,
 		       efi_system_table_t *sys_tab)
diff --git a/lib/elf.h b/lib/elf.h
new file mode 100644
index 00000000..abd5cf4b
--- /dev/null
+++ b/lib/elf.h
@@ -0,0 +1,57 @@ 
+/* SPDX-License-Identifier: LGPL-2.0-or-later */
+/*
+ * Relevant definitions from uapi/linux/elf.h and asm/elf.h
+ */
+
+#ifndef _ELF_H_
+#define _ELF_H_
+
+#include <libcflat.h>
+
+/* 64-bit ELF base types. */
+typedef u64	Elf64_Addr;
+typedef u64	Elf64_Xword;
+typedef s64	Elf64_Sxword;
+
+typedef struct {
+	Elf64_Sxword d_tag;             /* entry tag value */
+	union {
+		Elf64_Xword d_val;
+		Elf64_Addr d_ptr;
+	} d_un;
+} Elf64_Dyn;
+
+typedef struct elf64_rel {
+	Elf64_Addr r_offset;    /* Location at which to apply the action */
+	Elf64_Xword r_info;     /* index and type of relocation */
+} Elf64_Rel;
+
+typedef struct elf64_rela {
+	Elf64_Addr r_offset;    /* Location at which to apply the action */
+	Elf64_Xword r_info;     /* index and type of relocation */
+	Elf64_Sxword r_addend;  /* Constant addend used to compute value */
+} Elf64_Rela;
+
+/* This is the info that is needed to parse the dynamic section of the file */
+#define DT_NULL		0
+#define DT_RELA		7
+#define DT_RELASZ	8
+#define DT_RELAENT	9
+
+/* x86 relocation types. */
+#define R_X86_64_NONE		0       /* No reloc */
+#define R_X86_64_RELATIVE	8       /* Adjust by program base */
+
+
+/*
+ * AArch64 static relocation types.
+ */
+
+/* Miscellaneous. */
+#define R_AARCH64_NONE		256
+#define R_AARCH64_RELATIVE	1027
+
+/* The following are used with relocations */
+#define ELF64_R_TYPE(i)		((i) & 0xffffffff)
+
+#endif /* _ELF_H_ */