1 | /* Copyright (C) 2014-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <string.h> |
22 | #include <unistd.h> |
23 | #include <setjmp.h> |
24 | #include <sys/prctl.h> |
25 | |
26 | #if __mips_fpr != 0 || _MIPS_SPFPSET != 16 |
27 | # error This test requires -mfpxx -mno-odd-spreg |
28 | #endif |
29 | |
30 | /* This test verifies that mode changes between a setjmp and longjmp do |
31 | not corrupt the state of callee-saved registers. */ |
32 | |
33 | static int mode[6] = |
34 | { |
35 | 0, |
36 | PR_FP_MODE_FR, |
37 | PR_FP_MODE_FR | PR_FP_MODE_FRE, |
38 | PR_FP_MODE_FR, |
39 | 0, |
40 | PR_FP_MODE_FR | PR_FP_MODE_FRE |
41 | }; |
42 | static jmp_buf env; |
43 | float check1 = 2.0; |
44 | double check2 = 3.0; |
45 | |
46 | static int |
47 | do_test (void) |
48 | { |
49 | int i; |
50 | int result = 0; |
51 | |
52 | for (i = 0 ; i < 7 ; i++) |
53 | { |
54 | int retval; |
55 | register float test1 __asm ("$f20" ); |
56 | register double test2 __asm ("$f22" ); |
57 | |
58 | /* Hide what we are doing to $f20 and $f22 from the compiler. */ |
59 | __asm __volatile ("l.s %0,%2\n" |
60 | "l.d %1,%3\n" |
61 | : "=f" (test1), "=f" (test2) |
62 | : "m" (check1), "m" (check2)); |
63 | |
64 | retval = setjmp (env); |
65 | |
66 | /* Make sure the compiler knows we want to access the variables |
67 | via the named registers again. */ |
68 | __asm __volatile ("" : : "f" (test1), "f" (test2)); |
69 | |
70 | if (test1 != check1 || test2 != check2) |
71 | { |
72 | printf (format: "Corrupt register detected: $20 %f = %f, $22 %f = %f\n" , |
73 | test1, check1, test2, check2); |
74 | result = 1; |
75 | } |
76 | |
77 | if (retval == 0) |
78 | { |
79 | if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0 |
80 | && errno != ENOTSUP) |
81 | { |
82 | printf (format: "prctl PR_SET_FP_MODE failed: %m" ); |
83 | exit (1); |
84 | } |
85 | longjmp (env: env, val: 0); |
86 | } |
87 | } |
88 | |
89 | return result; |
90 | } |
91 | |
92 | #define TEST_FUNCTION do_test () |
93 | #include "../../test-skeleton.c" |
94 | |