80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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#include "exe.h"
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#include "elf.h"
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static enum ec3_status get_elf_executable_info(
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FILE *fp,
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struct ec3_tag_executable_info *out)
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{
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elf_ehdr_t hdr;
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fseek(fp, 0, SEEK_SET);
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size_t r = fread(&hdr, sizeof hdr, 1, fp);
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if (r != 1) {
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return EC3_ERR_IO_FAILURE;
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}
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out->exe_elf.elf_entry = hdr.e_entry;
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bool text_found = false, data_found = false;
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for (size_t i = 0; i < hdr.e_phnum; i++) {
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elf_phdr_t phdr;
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size_t offset = hdr.e_phoff + (i * hdr.e_phentsize);
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fseek(fp, offset, SEEK_SET);
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r = fread(&phdr, sizeof phdr, 1, fp);
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if (r != 1) {
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return EC3_ERR_IO_FAILURE;
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}
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if (phdr.p_type != PT_LOAD) {
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continue;
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}
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if ((phdr.p_flags & (PF_R | PF_X)) == (PF_R | PF_X)) {
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if (text_found) {
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out->exe_format = EC3_EXEC_OTHER;
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return EC3_SUCCESS;
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}
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out->exe_elf.elf_text_offset = phdr.p_offset;
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out->exe_elf.elf_text_filesz = phdr.p_filesz;
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out->exe_elf.elf_text_vaddr = phdr.p_vaddr;
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out->exe_elf.elf_text_memsz = phdr.p_memsz;
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out->exe_elf.elf_text_align = phdr.p_align;
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text_found = true;
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}
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if ((phdr.p_flags & (PF_R | PF_W)) == (PF_R | PF_W)) {
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if (data_found) {
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out->exe_format = EC3_EXEC_OTHER;
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return EC3_SUCCESS;
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}
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out->exe_elf.elf_data_offset = phdr.p_offset;
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out->exe_elf.elf_data_filesz = phdr.p_filesz;
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out->exe_elf.elf_data_vaddr = phdr.p_vaddr;
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out->exe_elf.elf_data_memsz = phdr.p_memsz;
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out->exe_elf.elf_data_align = phdr.p_align;
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data_found = true;
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}
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}
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return EC3_SUCCESS;
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}
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enum ec3_status get_executable_info_from_file(
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FILE *fp,
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enum ec3_executable_format format,
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struct ec3_tag_executable_info *out)
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{
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out->exe_format = format;
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switch (format) {
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case EC3_EXEC_ELF:
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return get_elf_executable_info(fp, out);
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default:
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return EC3_SUCCESS;
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}
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}
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