// SPDX-License-Identifier: GPL-2.0-only #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #include <link.h> #include <stdio.h> #include <stdlib.h> struct Statistics { unsigned long long load_address; unsigned long long alignment; }; int ExtractStatistics(struct dl_phdr_info *info, size_t size, void *data) { struct Statistics *stats = (struct Statistics *) data; int i; if (info->dlpi_name != NULL && info->dlpi_name[0] != '\0') { // Ignore headers from other than the executable. return 2; } stats->load_address = (unsigned long long) info->dlpi_addr; stats->alignment = 0; for (i = 0; i < info->dlpi_phnum; i++) { if (info->dlpi_phdr[i].p_type != PT_LOAD) continue; if (info->dlpi_phdr[i].p_align > stats->alignment) stats->alignment = info->dlpi_phdr[i].p_align; } return 1; // Terminate dl_iterate_phdr. } int main(int argc, char **argv) { struct Statistics extracted; unsigned long long misalign; int ret; ret = dl_iterate_phdr(ExtractStatistics, &extracted); if (ret != 1) { fprintf(stderr, "FAILED\n"); return 1; } if (extracted.alignment == 0) { fprintf(stderr, "No alignment found\n"); return 1; } else if (extracted.alignment & (extracted.alignment - 1)) { fprintf(stderr, "Alignment is not a power of 2\n"); return 1; } misalign = extracted.load_address & (extracted.alignment - 1); if (misalign) { printf("alignment = %llu, load_address = %llu\n", extracted.alignment, extracted.load_address); fprintf(stderr, "FAILED\n"); return 1; } fprintf(stderr, "PASS\n"); return 0; }