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89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* Copyright (C) 2000-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sysdep.h>
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#include <pointer_guard.h>
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#include <setjmp.h>
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#include <bits/setjmp.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stap-probe.h>
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/* See sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h. */
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#if IS_IN (rtld)
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# undef PTR_DEMANGLE
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#endif
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/* Jump to the position specified by ENV, causing the
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setjmp call there to return VAL, or 1 if VAL is 0. */
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void
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__longjmp (__jmp_buf env, int val)
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{
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#ifdef PTR_DEMANGLE
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uintptr_t guard = THREAD_GET_POINTER_GUARD ();
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# ifdef CHECK_SP
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CHECK_SP (env, guard);
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# endif
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#elif defined CHECK_SP
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CHECK_SP (env, 0);
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#endif
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register int r2 __asm__ ("%r2") = val == 0 ? 1 : val;
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#ifdef PTR_DEMANGLE
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register uintptr_t r3 __asm__ ("%r3") = guard;
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register void *r1 __asm__ ("%r1") = (void *) env;
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#endif
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/* Restore registers and jump back. */
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__asm__ __volatile__ (
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/* longjmp probe expects longjmp first argument, second
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argument and target address. */
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#ifdef PTR_DEMANGLE
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"lm %%r4,%%r5,32(%1)\n\t"
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"xr %%r4,%2\n\t"
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"xr %%r5,%2\n\t"
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LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r4)
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#else
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LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r14)
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#endif
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/* restore fpregs */
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"ld %%f6,48(%1)\n\t"
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"ld %%f4,40(%1)\n\t"
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/* restore gregs and return to jmp_buf target */
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#ifdef PTR_DEMANGLE
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"lm %%r6,%%r13,0(%1)\n\t"
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"lr %%r15,%%r5\n\t"
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LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r4)
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"br %%r4"
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#else
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"lm %%r6,%%r15,0(%1)\n\t"
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LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r14)
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"br %%r14"
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#endif
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: : "r" (r2),
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#ifdef PTR_DEMANGLE
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"r" (r1), "r" (r3)
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#else
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"a" (env)
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#endif
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);
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/* Avoid `volatile function does return' warnings. */
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for (;;);
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}
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