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/* Copyright (C) 2000-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <pointer_guard.h>
#include <setjmp.h>
#include <bits/setjmp.h>
#include <stdlib.h>
#include <unistd.h>
#include <stap-probe.h>
/* See sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h. */
#if IS_IN (rtld)
# undef PTR_DEMANGLE
#endif
/* Jump to the position specified by ENV, causing the
setjmp call there to return VAL, or 1 if VAL is 0. */
void
__longjmp (__jmp_buf env, int val)
{
#ifdef PTR_DEMANGLE
uintptr_t guard = THREAD_GET_POINTER_GUARD ();
# ifdef CHECK_SP
CHECK_SP (env, guard);
# endif
#elif defined CHECK_SP
CHECK_SP (env, 0);
#endif
register int r2 __asm__ ("%r2") = val == 0 ? 1 : val;
#ifdef PTR_DEMANGLE
register uintptr_t r3 __asm__ ("%r3") = guard;
register void *r1 __asm__ ("%r1") = (void *) env;
#endif
/* Restore registers and jump back. */
__asm__ __volatile__ (
/* longjmp probe expects longjmp first argument, second
argument and target address. */
#ifdef PTR_DEMANGLE
"lm %%r4,%%r5,32(%1)\n\t"
"xr %%r4,%2\n\t"
"xr %%r5,%2\n\t"
LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r4)
#else
LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r14)
#endif
/* restore fpregs */
"ld %%f6,48(%1)\n\t"
"ld %%f4,40(%1)\n\t"
/* restore gregs and return to jmp_buf target */
#ifdef PTR_DEMANGLE
"lm %%r6,%%r13,0(%1)\n\t"
"lr %%r15,%%r5\n\t"
LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r4)
"br %%r4"
#else
"lm %%r6,%%r15,0(%1)\n\t"
LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r14)
"br %%r14"
#endif
: : "r" (r2),
#ifdef PTR_DEMANGLE
"r" (r1), "r" (r3)
#else
"a" (env)
#endif
);
/* Avoid `volatile function does return' warnings. */
for (;;);
}
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