drgn/libdrgn/arch_arm.c

// Copyright (c) Meta Platforms, Inc. and affiliates.
// SPDX-License-Identifier: LGPL-2.1-or-later

#include <elf.h>

#include "platform.h" // IWYU pragma: associated

/*
 * The ABI specification can be found at:
 * https://developer.arm.com/architectures/system-architectures/software-standards/abi
 * https://github.com/ARM-software/abi-aa/releases
 */

static struct drgn_error *
apply_elf_reloc_arm(const struct drgn_relocating_section *relocating,
		    uint64_t r_offset, uint32_t r_type, const int64_t *r_addend,
		    uint64_t sym_value)
{
	switch (r_type) {
	case R_ARM_NONE:
		return NULL;
	case R_ARM_ABS32:
		return drgn_reloc_add32(relocating, r_offset, r_addend,
					sym_value);
	case R_ARM_REL32:
		return drgn_reloc_add32(relocating, r_offset, r_addend,
					sym_value
					- (relocating->addr + r_offset));
	default:
		return DRGN_UNKNOWN_RELOCATION_TYPE(r_type);
	}
}

const struct drgn_architecture_info arch_info_arm = {
	.name = "Arm",
	.arch = DRGN_ARCH_ARM,
	.default_flags = DRGN_PLATFORM_IS_LITTLE_ENDIAN,
	.register_by_name = drgn_register_by_name_unknown,
	.apply_elf_reloc = apply_elf_reloc_arm,
};