[PATCH] Fix dladdr on hppa

[John David Anglin]

On 2016-01-07 6:22 AM, Carlos O'Donell wrote:
> When might we have -1 and 0-4096?
>
> They are obviously not real fdescs, but when are they used?
>
>> >+  if ((int) addr == -1
>> >+      || (unsigned int) addr < 4096
>> >+      || !((unsigned int) addr & 2))
>> >+    return addr;

-1 is used in gcc's crtstuff.c to mark the end of a list of function 
pointers.
0-4096 is page 0 and can't be accessed on PA-RISC.  Thus, these values 
can be
reserved for special uses.  For example, we have for signals:

/* Fake signal functions.  */
#define SIG_ERR ((__sighandler_t) -1)           /* Error return.  */
#define SIG_DFL ((__sighandler_t) 0)            /* Default action. */
#define SIG_IGN ((__sighandler_t) 1)            /* Ignore signal. */

#ifdef __USE_UNIX98
# define SIG_HOLD       ((__sighandler_t) 2)    /* Add signal to hold 
mask.  */
#endif

Dave

-- 
John David Anglin  dave.anglin@bell.net