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