1 | /* Test that variant PCS calls don't clobber registers with lazy binding. |
2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdint.h> |
20 | #include <stdio.h> |
21 | #include <support/check.h> |
22 | |
23 | struct regs |
24 | { |
25 | uint64_t x[32]; |
26 | union { |
27 | long double q[32]; |
28 | uint64_t u[64]; |
29 | } v; |
30 | }; |
31 | |
32 | /* Gives the registers in the caller and callee around a variant PCS call. |
33 | Most registers are initialized from BEFORE in the caller so they can |
34 | have values that likely show clobbers. Register state extensions such |
35 | as SVE is not covered here, only the base registers. */ |
36 | void vpcs_call_regs (struct regs *after, struct regs *before); |
37 | |
38 | static int |
39 | do_test (void) |
40 | { |
41 | struct regs before, after; |
42 | int err = 0; |
43 | |
44 | unsigned char *p = (unsigned char *)&before; |
45 | for (int i = 0; i < sizeof before; i++) |
46 | p[i] = i & 0xff; |
47 | |
48 | vpcs_call_regs (after: &after, before: &before); |
49 | |
50 | for (int i = 0; i < 32; i++) |
51 | if (before.x[i] != after.x[i]) |
52 | { |
53 | if (i == 16 || i == 17) |
54 | /* Variant PCS allows clobbering x16 and x17. */ |
55 | continue; |
56 | err++; |
57 | printf (format: "x%d: before: 0x%016llx after: 0x%016llx\n" , |
58 | i, |
59 | (unsigned long long)before.x[i], |
60 | (unsigned long long)after.x[i]); |
61 | } |
62 | for (int i = 0; i < 64; i++) |
63 | if (before.v.u[i] != after.v.u[i]) |
64 | { |
65 | err++; |
66 | printf (format: "v%d: before: 0x%016llx %016llx after: 0x%016llx %016llx\n" , |
67 | i/2, |
68 | (unsigned long long)before.v.u[2*(i/2)+1], |
69 | (unsigned long long)before.v.u[2*(i/2)], |
70 | (unsigned long long)after.v.u[2*(i/2)+1], |
71 | (unsigned long long)after.v.u[2*(i/2)]); |
72 | } |
73 | if (err) |
74 | FAIL_EXIT1 ("The variant PCS call clobbered %d registers.\n" , err); |
75 | return 0; |
76 | } |
77 | |
78 | #include <support/test-driver.c> |
79 | |