| 1 | /* setjmp for s390, ELF version. |
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| 2 | Copyright (C) 2000-2024 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 <sysdep.h> |
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| 20 | #include <pointer_guard.h> |
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| 21 | #define _ASM |
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| 22 | #define _SETJMP_H |
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| 23 | #include <bits/setjmp.h> |
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| 24 | #include <shlib-compat.h> |
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| 25 | #include <stap-probe.h> |
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| 26 | |
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| 27 | #if !IS_IN (rtld) && defined SHARED \ |
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| 28 | && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20) |
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| 29 | # define NEED_COMPAT_SYMBOLS 1 |
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| 30 | /* We need a unique name in case of symbol versioning. */ |
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| 31 | # define setjmp __v1setjmp |
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| 32 | # define _setjmp __v1_setjmp |
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| 33 | # define __sigsetjmp __v1__sigsetjmp |
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| 34 | #else |
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| 35 | # define NEED_COMPAT_SYMBOLS 0 |
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| 36 | #endif |
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| 37 | |
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| 38 | /* We include the BSD entry points here as well. */ |
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| 39 | ENTRY (setjmp) |
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| 40 | lhi %r3,1 /* second argument of one */ |
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| 41 | j .Linternal_sigsetjmp /* branch relative to __sigsetjmp */ |
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| 42 | END (setjmp) |
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| 43 | |
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| 44 | /* Binary compatibility entry point. */ |
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| 45 | ENTRY(_setjmp) |
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| 46 | lhi %r3,0 /* second argument of zero */ |
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| 47 | j .Linternal_sigsetjmp /* branch relative to __sigsetjmp */ |
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| 48 | END (_setjmp) |
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| 49 | #if NEED_COMPAT_SYMBOLS |
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| 50 | strong_alias (_setjmp, __GI__setjmp) |
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| 51 | #else |
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| 52 | libc_hidden_def (_setjmp) |
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| 53 | #endif |
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| 54 | |
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| 55 | ENTRY(__setjmp) |
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| 56 | lhi %r3,0 /* second argument of zero */ |
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| 57 | j .Linternal_sigsetjmp /* branch relative to __sigsetjmp */ |
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| 58 | END (__setjmp) |
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| 59 | |
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| 60 | ENTRY(__sigsetjmp) |
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| 61 | .Linternal_sigsetjmp: |
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| 62 | /* setjmp probe expects sig/setjmp first argument (4@%r2), second |
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| 63 | argument (-4@%r3) and target address (4@%r14). */ |
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| 64 | LIBC_PROBE (setjmp, 3, 4@%r2, -4@%r3, 4@%r14) |
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| 65 | #ifdef PTR_MANGLE |
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| 66 | stm %r6,%r13,0(%r2) /* store registers in jmp_buf */ |
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| 67 | lr %r4,%r14 |
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| 68 | lr %r5,%r15 |
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| 69 | PTR_MANGLE (%r4, %r1) |
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| 70 | PTR_MANGLE2 (%r5, %r1) |
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| 71 | stm %r4,%r5,32(%r2) |
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| 72 | #else |
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| 73 | stm %r6,%r15,0(%r2) /* store registers in jmp_buf */ |
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| 74 | #endif |
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| 75 | std %f4,40(%r2) |
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| 76 | std %f6,48(%r2) |
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| 77 | #if IS_IN (rtld) |
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| 78 | /* In ld.so we never save the signal mask. */ |
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| 79 | lhi %r2,0 |
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| 80 | br %r14 |
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| 81 | #elif defined PIC |
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| 82 | /* We cannot use the PLT, because it requires that %r12 be set, but |
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| 83 | we can't save and restore our caller's value. Instead, we do an |
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| 84 | indirect jump through the GOT. */ |
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| 85 | basr %r1,0 |
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| 86 | .L0: al %r1,.L1 - .L0(0,%r1) /* get address of global offset table */ |
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| 87 | /* get address of __sigjmp_save from got */ |
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| 88 | l %r1,__sigjmp_save@GOT(%r1) |
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| 89 | br %r1 |
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| 90 | .L1: .long _GLOBAL_OFFSET_TABLE_ - .L0 |
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| 91 | #else |
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| 92 | basr %r1,0 |
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| 93 | .L0: l %r1,.L1-.L0(0,%r1) /* load address of __sigjmp_save */ |
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| 94 | br %r1 /* tail-call __sigjmp_save */ |
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| 95 | .L1: .long __sigjmp_save |
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| 96 | #endif |
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| 97 | END (__sigsetjmp) |
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| 98 | #if NEED_COMPAT_SYMBOLS |
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| 99 | strong_alias (__sigsetjmp, __GI___sigsetjmp) |
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| 100 | #else |
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| 101 | libc_hidden_def (__sigsetjmp) |
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| 102 | #endif |
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| 103 | |
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| 104 | #if NEED_COMPAT_SYMBOLS |
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| 105 | /* In glibc release 2.19 new versions of setjmp-functions were introduced, |
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| 106 | but were reverted before 2.20. Thus both versions are the same function. */ |
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| 107 | |
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| 108 | # undef setjmp |
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| 109 | # undef _setjmp |
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| 110 | # undef __sigsetjmp |
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| 111 | |
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| 112 | strong_alias (__v1setjmp, __v2setjmp); |
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| 113 | versioned_symbol (libc, __v1setjmp, setjmp, GLIBC_2_0); |
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| 114 | compat_symbol (libc, __v2setjmp, setjmp, GLIBC_2_19); |
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| 115 | |
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| 116 | strong_alias (__v1_setjmp, __v2_setjmp); |
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| 117 | versioned_symbol (libc, __v1_setjmp, _setjmp, GLIBC_2_0); |
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| 118 | compat_symbol (libc, __v2_setjmp, _setjmp, GLIBC_2_19); |
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| 119 | |
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| 120 | strong_alias (__v1__sigsetjmp, __v2__sigsetjmp); |
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| 121 | versioned_symbol (libc, __v1__sigsetjmp, __sigsetjmp, GLIBC_2_0); |
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| 122 | compat_symbol (libc, __v2__sigsetjmp, __sigsetjmp, GLIBC_2_19); |
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| 123 | #endif /* NEED_COMPAT_SYMBOLS */ |
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| 124 | |
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