+2024-04-07 Bruno Haible <bruno@clisp.org>
+
+ sigsegv tests: Avoid a crash on NetBSD 10.0/i386.
+ * tests/test-sigsegv-catch-stackoverflow1.c
+ (stackoverflow_handler_continuation): On NetBSD/i386, align the stack
+ pointer before calling longjmp.
+
2024-04-06 Bruno Haible <bruno@clisp.org>
expm1l: Work around a NetBSD 10.0/i386 bug.
/* Test the stack overflow handler.
- Copyright (C) 2002-2023 Free Software Foundation, Inc.
+ Copyright (C) 2002-2024 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
static void
stackoverflow_handler_continuation (void *arg1, void *arg2, void *arg3)
{
+#if defined __NetBSD__ && defined __i386__
+ /* On NetBSD 10.0/i386, when built as part of a testdir-all (but not as part
+ of a testdir for just the module 'sigsegv'!) this program crashes. The
+ cause is that:
+ - The alternate stack is not aligned (which is intentional, see
+ altstack-util.h) and NetBSD does not align the stack pointer while
+ switching to the alternate stack.
+ - When %esp is not aligned, the dynamic linker crashes in function
+ _rtld_bind while resolving the symbol 'longjmp'.
+ We would around this by aligning the stack pointer, to a multiple of 8. */
+ int *argp;
+ __asm__ __volatile__ ("movl %1,%0" : "=r" (argp) : "r" (&arg1));
+ unsigned long sp;
+ __asm__ __volatile__ ("movl %%esp,%0" : "=r" (sp));
+ sp &= ~7UL;
+ __asm__ __volatile__ ("movl %0,%%esp" : : "r" (sp));
+ int arg = *argp;
+#else
int arg = (int) (long) arg1;
+#endif
longjmp (mainloop, arg);
}