1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun #ifndef _GNU_SOURCE
3*4882a593Smuzhiyun #define _GNU_SOURCE
4*4882a593Smuzhiyun #endif
5*4882a593Smuzhiyun #include <link.h>
6*4882a593Smuzhiyun #include <stdio.h>
7*4882a593Smuzhiyun #include <stdlib.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun struct Statistics {
10*4882a593Smuzhiyun unsigned long long load_address;
11*4882a593Smuzhiyun unsigned long long alignment;
12*4882a593Smuzhiyun };
13*4882a593Smuzhiyun
ExtractStatistics(struct dl_phdr_info * info,size_t size,void * data)14*4882a593Smuzhiyun int ExtractStatistics(struct dl_phdr_info *info, size_t size, void *data)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun struct Statistics *stats = (struct Statistics *) data;
17*4882a593Smuzhiyun int i;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun if (info->dlpi_name != NULL && info->dlpi_name[0] != '\0') {
20*4882a593Smuzhiyun // Ignore headers from other than the executable.
21*4882a593Smuzhiyun return 2;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun stats->load_address = (unsigned long long) info->dlpi_addr;
25*4882a593Smuzhiyun stats->alignment = 0;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun for (i = 0; i < info->dlpi_phnum; i++) {
28*4882a593Smuzhiyun if (info->dlpi_phdr[i].p_type != PT_LOAD)
29*4882a593Smuzhiyun continue;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun if (info->dlpi_phdr[i].p_align > stats->alignment)
32*4882a593Smuzhiyun stats->alignment = info->dlpi_phdr[i].p_align;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return 1; // Terminate dl_iterate_phdr.
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
main(int argc,char ** argv)38*4882a593Smuzhiyun int main(int argc, char **argv)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct Statistics extracted;
41*4882a593Smuzhiyun unsigned long long misalign;
42*4882a593Smuzhiyun int ret;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun ret = dl_iterate_phdr(ExtractStatistics, &extracted);
45*4882a593Smuzhiyun if (ret != 1) {
46*4882a593Smuzhiyun fprintf(stderr, "FAILED\n");
47*4882a593Smuzhiyun return 1;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun if (extracted.alignment == 0) {
51*4882a593Smuzhiyun fprintf(stderr, "No alignment found\n");
52*4882a593Smuzhiyun return 1;
53*4882a593Smuzhiyun } else if (extracted.alignment & (extracted.alignment - 1)) {
54*4882a593Smuzhiyun fprintf(stderr, "Alignment is not a power of 2\n");
55*4882a593Smuzhiyun return 1;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun misalign = extracted.load_address & (extracted.alignment - 1);
59*4882a593Smuzhiyun if (misalign) {
60*4882a593Smuzhiyun printf("alignment = %llu, load_address = %llu\n",
61*4882a593Smuzhiyun extracted.alignment, extracted.load_address);
62*4882a593Smuzhiyun fprintf(stderr, "FAILED\n");
63*4882a593Smuzhiyun return 1;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun fprintf(stderr, "PASS\n");
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
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