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// 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;
}
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