elf_arm.c

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// SPDX-FileCopyrightText: 2021 08A <08A@riseup.net>
// SPDX-FileCopyrightText: 2021 RizinOrg <info@rizin.re>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include "elf.h"
 
static bool start_a_sequence_of_instruction(RzBinSymbol *symbol) {
    return strlen(symbol->name) > 3 && rz_str_startswith(symbol->name, "$a.");
}
 
static bool start_a_sequence_of_thumb_instruction(RzBinSymbol *symbol) {
    return strlen(symbol->name) > 3 && rz_str_startswith(symbol->name, "$t.");
}
 
static bool start_a_sequence_of_data(RzBinSymbol *symbol) {
    return strlen(symbol->name) > 3 && rz_str_startswith(symbol->name, "$d.");
}
 
bool Elf_(rz_bin_elf_is_arm_binary_supporting_thumb)(RZ_NONNULL ELFOBJ *bin) {
    rz_return_val_if_fail(bin, false);
    return bin->ehdr.e_machine == EM_ARM;
}
 
bool Elf_(rz_bin_elf_is_thumb_addr)(ut64 addr) {
    return addr != UT64_MAX && addr & 1;
}
 
void Elf_(rz_bin_elf_fix_arm_thumb_addr)(ut64 *addr) {
    rz_return_if_fail(Elf_(rz_bin_elf_is_thumb_addr(*addr)));
    *addr -= 1;
}
 
void Elf_(rz_bin_elf_fix_arm_thumb_object)(RZ_NONNULL ut64 *paddr, RZ_NONNULL ut64 *vaddr, RZ_NONNULL int *bits) {
    rz_return_if_fail(paddr && vaddr && bits);
 
    *bits = 32;
 
    if (Elf_(rz_bin_elf_is_thumb_addr)(*paddr)) {
        Elf_(rz_bin_elf_fix_arm_thumb_addr)(paddr);
        *bits = 16;
    }
 
    if (Elf_(rz_bin_elf_is_thumb_addr)(*vaddr)) {
        Elf_(rz_bin_elf_fix_arm_thumb_addr)(vaddr);
        *bits = 16;
    }
}
 
void Elf_(rz_bin_elf_fix_arm_thumb_symbol)(RZ_NONNULL RzBinSymbol *symbol) {
    rz_return_if_fail(symbol && symbol->name);
 
    if (start_a_sequence_of_instruction(symbol)) {
        symbol->bits = 32;
    } else if (start_a_sequence_of_thumb_instruction(symbol) || !start_a_sequence_of_data(symbol)) {
        rz_bin_elf_fix_arm_thumb_object_dispatch(symbol);
    }
}