[Bug uprobes/12275] uretprobes break exception handling

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12275

Mark Wielaard <mjw at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mjw at redhat dot com

--- Comment #1 from Mark Wielaard <mjw at redhat dot com> 2010-12-01 20:32:32 UTC ---
We were discussing how this relates to the longjmp case, seeing that also has
"strange" stack frames. But a simple example works fine.

$ cat lj.c 
#include <setjmp.h>
#include <stdio.h>

jmp_buf b;

void
foo ()
{
  longjmp (b, 1);
  printf("impossible in func!\n");
}

int
main ()
{
  if (setjmp(b) != 0)
    {
      printf("jumped back!\n");
      return 0;
    }

  foo ();
  printf("impossible in main!\n");
  return -1;
}

$ gcc -g -Wall -o lj lj.c 

$ stap -we 'probe process("./lj").function("foo").return {}' -c ./lj
jumped back!

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