| 1 | /* Test that lazy binding does not clobber r0. |
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| 2 | Copyright (C) 2018-2022 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 | #include <assert.h> |
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| 20 | #include <dlfcn.h> |
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| 21 | #include <stdio.h> |
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| 22 | #include <stdlib.h> |
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| 23 | #include <unistd.h> |
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| 24 | |
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| 25 | #if defined (__s390x__) |
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| 26 | static const unsigned long magic_value = 0x0011223344556677UL; |
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| 27 | #else |
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| 28 | static const unsigned long magic_value = 0x00112233; |
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| 29 | #endif |
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| 30 | |
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| 31 | unsigned long r0x2_trampoline (unsigned long); |
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| 32 | |
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| 33 | /* Invoke r0x2, which doubles the value in r0. If we get |
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| 34 | value * 2 back, this means nothing clobbers r0, particularly, |
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| 35 | _dl_runtime_resolve and _dl_runtime_profile. */ |
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| 36 | asm (" .type r0x2_trampoline, @function\n" |
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| 37 | "r0x2_trampoline:\n" |
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| 38 | #if defined (__s390x__) |
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| 39 | " lgr %r0,%r2\n" |
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| 40 | " stg %r14,112(%r15)\n" |
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| 41 | " aghi %r15,-160\n" |
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| 42 | " brasl %r14,r0x2@plt\n" |
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| 43 | " aghi %r15,160\n" |
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| 44 | " lg %r14,112(%r15)\n" |
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| 45 | " lgr %r2,%r0\n" |
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| 46 | " br %r14\n" |
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| 47 | #elif defined (__zarch__) |
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| 48 | " lr %r0,%r2\n" |
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| 49 | " st %r14,56(%r15)\n" |
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| 50 | " ahi %r15,-96\n" |
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| 51 | " brasl %r14,r0x2@plt\n" |
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| 52 | " ahi %r15,96\n" |
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| 53 | " l %r14,56(%r15)\n" |
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| 54 | " lr %r2,%r0\n" |
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| 55 | " br %r14\n" |
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| 56 | #else |
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| 57 | " lr %r0,%r2\n" |
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| 58 | " st %r14,56(%r15)\n" |
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| 59 | " ahi %r15,-96\n" |
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| 60 | " balr %r14,0\n" |
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| 61 | " l %r14,1f-.(%r14)\n" |
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| 62 | " basr %r14,%r14\n" |
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| 63 | " ahi %r15,96\n" |
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| 64 | " l %r14,56(%r15)\n" |
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| 65 | " lr %r2,%r0\n" |
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| 66 | " br %r14\n" |
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| 67 | "1: .long r0x2\n" |
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| 68 | #endif |
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| 69 | ); |
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| 70 | |
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| 71 | static int |
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| 72 | do_test (void) |
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| 73 | { |
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| 74 | int i; |
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| 75 | unsigned long r0; |
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| 76 | const char *run; |
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| 77 | |
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| 78 | for (i = 0; i < 2; i++) |
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| 79 | { |
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| 80 | run = (i == 0) ? "lazy" : "non-lazy" ; |
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| 81 | r0 = magic_value; |
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| 82 | printf (format: "-> %s r0 = 0x%lx\n" , run, r0); |
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| 83 | r0 = r0x2_trampoline (r0); |
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| 84 | printf (format: "<- %s r0 * 2 = 0x%lx\n" , run, r0); |
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| 85 | if (r0 != magic_value * 2) |
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| 86 | return EXIT_FAILURE; |
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| 87 | } |
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| 88 | return EXIT_SUCCESS; |
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| 89 | } |
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| 90 | |
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| 91 | #include <support/test-driver.c> |
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| 92 | |
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