| 1 | /* Test for IFUNC handling with local definitions. |
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| 2 | Copyright (C) 2019-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* This test is based on gcc.dg/attr-ifunc-4.c. */ |
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| 20 | |
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| 21 | #include <config.h> |
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| 22 | |
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| 23 | # include <stdbool.h> |
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| 24 | # include <stdio.h> |
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| 25 | |
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| 26 | /* Do not use the test framework, so that the process setup is not |
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| 27 | disturbed. */ |
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| 28 | |
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| 29 | static volatile int implementation_called; |
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| 30 | static volatile int resolver_called; |
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| 31 | |
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| 32 | /* Just a random constant, to check that we called the right |
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| 33 | function. */ |
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| 34 | enum { random_constant = 0x3a88d66d }; |
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| 35 | |
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| 36 | static int |
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| 37 | implementation (void) |
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| 38 | { |
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| 39 | ++implementation_called; |
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| 40 | return random_constant; |
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| 41 | } |
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| 42 | |
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| 43 | static __typeof__ (implementation) * |
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| 44 | inhibit_stack_protector |
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| 45 | resolver (void) |
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| 46 | { |
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| 47 | ++resolver_called; |
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| 48 | return implementation; |
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| 49 | } |
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| 50 | |
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| 51 | static int magic (void) __attribute__ ((ifunc ("resolver" ))); |
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| 52 | |
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| 53 | int |
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| 54 | main (void) |
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| 55 | { |
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| 56 | bool errors = false; |
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| 57 | |
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| 58 | if (implementation_called != 0) |
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| 59 | { |
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| 60 | printf (format: "error: initial value of implementation_called is not zero:" |
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| 61 | " %d\n" , implementation_called); |
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| 62 | errors = true; |
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| 63 | } |
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| 64 | |
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| 65 | /* This can be zero if the reference is bound lazily. */ |
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| 66 | printf (format: "info: initial value of resolver_called: %d\n" , resolver_called); |
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| 67 | |
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| 68 | int magic_value = magic (); |
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| 69 | if (magic_value != random_constant) |
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| 70 | { |
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| 71 | printf (format: "error: invalid magic value: 0x%x\n" , magic_value); |
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| 72 | errors = true; |
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| 73 | } |
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| 74 | |
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| 75 | printf (format: "info: resolver_called value: %d\n" , resolver_called); |
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| 76 | if (resolver_called == 0) |
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| 77 | { |
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| 78 | /* In theory, the resolver could be called multiple times if |
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| 79 | several relocations are needed. */ |
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| 80 | puts (s: "error: invalid resolver_called value (must not be zero)" ); |
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| 81 | errors = true; |
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| 82 | } |
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| 83 | |
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| 84 | printf (format: "info: implementation_called value: %d\n" , implementation_called); |
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| 85 | if (implementation_called != 1) |
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| 86 | { |
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| 87 | puts (s: "error: invalid implementation_called value (must be 1)" ); |
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| 88 | errors = true; |
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| 89 | } |
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| 90 | |
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| 91 | return errors; |
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| 92 | } |
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| 93 | |
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